// You can set the following variables before loading this script:
//
// var netdataNoDygraphs = true;		// do not use dygraph
// var netdataNoSparklines = true;		// do not use sparkline
// var netdataNoPeitys = true;			// do not use peity
// var netdataNoGoogleCharts = true;	// do not use google
// var netdataNoMorris = true;			// do not use morris
// var netdataNoEasyPieChart = true;	// do not use easy pie chart
// var netdataNoGauge = true;			// do not use gauge.js
// var netdataNoD3 = true;				// do not use D3
// var netdataNoC3 = true;				// do not use C3
// var netdataNoBootstrap = true;		// do not load bootstrap
// var netdataDontStart = true;			// do not start the thread to process the charts
//
// You can also set the default netdata server, using the following.
// When this variable is not set, we assume the page is hosted on your
// netdata server already.
// var netdataServer = "http://yourhost:19999"; // set your NetData server

//(function(window, document, undefined) {
	// fix IE issue with console
	if(!window.console){ window.console = {log: function(){} }; }

	// global namespace
	var NETDATA = window.NETDATA || {};

	// ----------------------------------------------------------------------------------------------------------------
	// Detect the netdata server

	// http://stackoverflow.com/questions/984510/what-is-my-script-src-url
	// http://stackoverflow.com/questions/6941533/get-protocol-domain-and-port-from-url
	NETDATA._scriptSource = function() {
		var script = null;

		if(typeof document.currentScript !== 'undefined') {
			script = document.currentScript;
		}
		else {
			var all_scripts = document.getElementsByTagName('script');
			script = all_scripts[all_scripts.length - 1];
		}

		if (typeof script.getAttribute.length !== 'undefined')
			script = script.src;
		else
			script = script.getAttribute('src', -1);

		return script;
	};

	if(typeof netdataServer !== 'undefined')
		NETDATA.serverDefault = netdataServer;
	else {
		var s = NETDATA._scriptSource();
		NETDATA.serverDefault = s.replace(/\/dashboard.js(\?.*)*$/g, "");
	}

	if(NETDATA.serverDefault === null)
		NETDATA.serverDefault = '';
	else if(NETDATA.serverDefault.slice(-1) !== '/')
		NETDATA.serverDefault += '/';

	// default URLs for all the external files we need
	// make them RELATIVE so that the whole thing can also be
	// installed under a web server
	NETDATA.jQuery       		= NETDATA.serverDefault + 'lib/jquery-1.12.0.min.js';
	NETDATA.peity_js     		= NETDATA.serverDefault + 'lib/jquery.peity.min.js';
	NETDATA.sparkline_js 		= NETDATA.serverDefault + 'lib/jquery.sparkline.min.js';
	NETDATA.easypiechart_js 	= NETDATA.serverDefault + 'lib/jquery.easypiechart.min.js';
	NETDATA.gauge_js 			= NETDATA.serverDefault + 'lib/gauge.min.js';
	NETDATA.dygraph_js   		= NETDATA.serverDefault + 'lib/dygraph-combined.js';
	NETDATA.dygraph_smooth_js   = NETDATA.serverDefault + 'lib/dygraph-smooth-plotter.js';
	NETDATA.raphael_js   		= NETDATA.serverDefault + 'lib/raphael-min.js';
	NETDATA.morris_js    		= NETDATA.serverDefault + 'lib/morris.min.js';
	NETDATA.d3_js  		  		= NETDATA.serverDefault + 'lib/d3.min.js';
	NETDATA.c3_js  		  		= NETDATA.serverDefault + 'lib/c3.min.js';
	NETDATA.c3_css   			= NETDATA.serverDefault + 'css/c3.min.css';
	NETDATA.morris_css   		= NETDATA.serverDefault + 'css/morris.css';
	NETDATA.google_js    		= 'https://www.google.com/jsapi';

	NETDATA.themes = {
		default: {
			bootstrap_css: NETDATA.serverDefault + 'css/bootstrap.min.css',
			dashboard_css: NETDATA.serverDefault + 'dashboard.css',
			background: '#FFFFFF',
			foreground: '#000000',
			grid: '#DDDDDD',
			axis: '#CCCCCC',
			colors: [ 	'#3366CC', '#DC3912',   '#109618', '#FF9900',   '#990099', '#DD4477',
						'#3B3EAC', '#66AA00',   '#0099C6', '#B82E2E',   '#AAAA11', '#5574A6',
						'#994499', '#22AA99',   '#6633CC', '#E67300',   '#316395', '#8B0707',
						'#329262', '#3B3EAC' ],
			easypiechart_track: '#f0f0f0',
			easypiechart_scale: '#dfe0e0',
			gauge_pointer: '#C0C0C0',
			gauge_stroke: '#F0F0F0',
			gauge_gradient: true
		},
		slate: {
			bootstrap_css: NETDATA.serverDefault + 'css/bootstrap.slate.min.css',
			dashboard_css: NETDATA.serverDefault + 'dashboard.slate.css',
			background: '#272b30',
			foreground: '#C8C8C8',
			grid: '#373b40',
			axis: '#373b40',
/*			colors: [ 	'#55bb33', '#ff2222',   '#0099C6', '#faa11b',   '#adbce0', '#DDDD00',
						'#4178ba', '#f58122',   '#a5cc39', '#f58667',   '#f5ef89', '#cf93c0',
						'#a5d18a', '#b8539d',   '#3954a3', '#c8a9cf',   '#c7de8a', '#fad20a',
						'#a6a479', '#a66da8' ],
*/
			colors: [ 	'#66AA00', '#FE3912',   '#3366CC', '#D66300',   '#0099C6', '#DDDD00',
						'#3B3EAC', '#EE9911',   '#BB44CC', '#C83E3E',   '#990099', '#CC7700',
						'#22AA99', '#109618',   '#6633CC', '#DD4477',   '#316395', '#8B0707',
						'#329262', '#3B3EFF' ],
			easypiechart_track: '#373b40',
			easypiechart_scale: '#373b40',
			gauge_pointer: '#474b50',
			gauge_stroke: '#373b40',
			gauge_gradient: false
		}
	};

	if(typeof netdataTheme !== 'undefined' && typeof NETDATA.themes[netdataTheme] !== 'undefined')
		NETDATA.themes.current = NETDATA.themes[netdataTheme];
	else
		NETDATA.themes.current = NETDATA.themes.default;

	NETDATA.colors = NETDATA.themes.current.colors;

	// these are the colors Google Charts are using
	// we have them here to attempt emulate their look and feel on the other chart libraries
	// http://there4.io/2012/05/02/google-chart-color-list/
	//NETDATA.colors		= [ '#3366CC', '#DC3912', '#FF9900', '#109618', '#990099', '#3B3EAC', '#0099C6',
	//						'#DD4477', '#66AA00', '#B82E2E', '#316395', '#994499', '#22AA99', '#AAAA11',
	//						'#6633CC', '#E67300', '#8B0707', '#329262', '#5574A6', '#3B3EAC' ];

	// an alternative set
	// http://www.mulinblog.com/a-color-palette-optimized-for-data-visualization/
	//                         (blue)     (red)      (orange)   (green)    (pink)     (brown)    (purple)   (yellow)   (gray)
	//NETDATA.colors 		= [ '#5DA5DA', '#F15854', '#FAA43A', '#60BD68', '#F17CB0', '#B2912F', '#B276B2', '#DECF3F', '#4D4D4D' ];

	// ----------------------------------------------------------------------------------------------------------------
	// the defaults for all charts

	// if the user does not specify any of these, the following will be used

	NETDATA.chartDefaults = {
		host: NETDATA.serverDefault,	// the server to get data from
		width: '100%',					// the chart width - can be null
		height: '100%',					// the chart height - can be null
		min_width: null,				// the chart minimum width - can be null
		library: 'dygraph',				// the graphing library to use
		method: 'average',				// the grouping method
		before: 0,						// panning
		after: -600,					// panning
		pixels_per_point: 1,			// the detail of the chart
		fill_luminance: 0.8				// luminance of colors in solit areas
	}

	// ----------------------------------------------------------------------------------------------------------------
	// global options

	NETDATA.options = {
		pauseCallback: null,			// a callback when we are really paused

		pause: false,					// when enabled we don't auto-refresh the charts

		targets: null,					// an array of all the state objects that are
										// currently active (independently of their
										// viewport visibility)

		updated_dom: true,				// when true, the DOM has been updated with
										// new elements we have to check.

		auto_refresher_fast_weight: 0,	// this is the current time in ms, spent
										// rendering charts continiously.
										// used with .current.fast_render_timeframe

		page_is_visible: true,			// when true, this page is visible

		auto_refresher_stop_until: 0,	// timestamp in ms - used internaly, to stop the
										// auto-refresher for some time (when a chart is
										// performing pan or zoom, we need to stop refreshing
										// all other charts, to have the maximum speed for
										// rendering the chart that is panned or zoomed).
										// Used with .current.global_pan_sync_time

		last_resized: new Date().getTime(), // the timestamp of the last resize request

		crossDomainAjax: false,			// enable this to request crossDomain AJAX

		last_page_scroll: 0,			// the timestamp the last time the page was scrolled

		// the current profile
		// we may have many...
		current: {
			pixels_per_point: 1,		// the minimum pixels per point for all charts
										// increase this to speed javascript up
										// each chart library has its own limit too
										// the max of this and the chart library is used
										// the final is calculated every time, so a change
										// here will have immediate effect on the next chart
										// update

			idle_between_charts: 100,	// ms - how much time to wait between chart updates

			fast_render_timeframe: 200, // ms - render continously until this time of continious
										// rendering has been reached
										// this setting is used to make it render e.g. 10
										// charts at once, sleep idle_between_charts time
										// and continue for another 10 charts.

			idle_between_loops: 500,	// ms - if all charts have been updated, wait this
										// time before starting again.

			idle_parallel_loops: 100,	// ms - the time between parallel refresher updates

			idle_lost_focus: 500,		// ms - when the window does not have focus, check
										// if focus has been regained, every this time

			global_pan_sync_time: 1000,	// ms - when you pan or zoon a chart, the background
										// autorefreshing of charts is paused for this amount
										// of time

			sync_selection_delay: 1500,	// ms - when you pan or zoom a chart, wait this amount
										// of time before setting up synchronized selections
										// on hover.

			sync_selection: true,		// enable or disable selection sync

			pan_and_zoom_delay: 50,		// when panning or zooming, how ofter to update the chart

			sync_pan_and_zoom: true,	// enable or disable pan and zoom sync

			pan_and_zoom_data_padding: true, // fetch more data for the master chart when panning or zooming

			update_only_visible: true,	// enable or disable visibility management

			parallel_refresher: true,	// enable parallel refresh of charts

			concurrent_refreshes: true,	// when parallel_refresher is enabled, sync also the charts

			destroy_on_hide: false,		// destroy charts when they are not visible

			eliminate_zero_dimensions: true, // do not show dimensions with just zeros

			stop_updates_when_focus_is_lost: true, // boolean - shall we stop auto-refreshes when document does not have user focus
			stop_updates_while_resizing: 1000,	// ms - time to stop auto-refreshes while resizing the charts

			double_click_speed: 500,	// ms - time between clicks / taps to detect double click/tap

 			smooth_plot: true,			// enable smooth plot, where possible

			charts_selection_animation_delay: 50, // delay to animate charts when syncing selection

 			color_fill_opacity_line: 1.0,
 			color_fill_opacity_area: 0.2,
			color_fill_opacity_stacked: 0.8,

			setOptionCallback: function() { ; }
		},

		debug: {
			show_boxes: 		false,
			main_loop: 			false,
			focus: 				false,
			visibility: 		false,
			chart_data_url: 	false,
			chart_errors: 		false, // FIXME
			chart_timing: 		false,
			chart_calls: 		false,
			libraries: 			false,
			dygraph: 			false
		}
	}


	// ----------------------------------------------------------------------------------------------------------------
	// local storage options

	NETDATA.localStorage = {
		default: {},
		current: {},
		callback: {} // only used for resetting back to defaults
	};

	NETDATA.localStorageGet = function(key, def, callback) {
		var ret = def;

		if(typeof NETDATA.localStorage.default[key.toString()] === 'undefined') {
			NETDATA.localStorage.default[key.toString()] = def;
			NETDATA.localStorage.callback[key.toString()] = callback;
		}

		if(typeof Storage !== "undefined" && typeof localStorage === 'object') {
			try {
				// console.log('localStorage: loading "' + key.toString() + '"');
				ret = localStorage.getItem(key.toString());
				if(ret === null || ret === 'undefined') {
					// console.log('localStorage: cannot load it, saving "' + key.toString() + '" with value "' + JSON.stringify(def) + '"');
					localStorage.setItem(key.toString(), JSON.stringify(def));
					ret = def;
				}
				else {
					// console.log('localStorage: got "' + key.toString() + '" with value "' + ret + '"');
					ret = JSON.parse(ret);
					// console.log('localStorage: loaded "' + key.toString() + '" as value ' + ret + ' of type ' + typeof(ret));
				}
			}
			catch(error) {
				console.log('localStorage: failed to read "' + key.toString() + '", using default: "' + def.toString() + '"');
				ret = def;
			}
		}

		if(typeof ret === 'undefined' || ret === 'undefined') {
			console.log('localStorage: LOADED UNDEFINED "' + key.toString() + '" as value ' + ret + ' of type ' + typeof(ret));
			ret = def;
		}

		NETDATA.localStorage.current[key.toString()] = ret;
		return ret;
	}

	NETDATA.localStorageSet = function(key, value, callback) {
		if(typeof value === 'undefined' || value === 'undefined') {
			console.log('localStorage: ATTEMPT TO SET UNDEFINED "' + key.toString() + '" as value ' + value + ' of type ' + typeof(value));
		}

		if(typeof NETDATA.localStorage.default[key.toString()] === 'undefined') {
			NETDATA.localStorage.default[key.toString()] = value;
			NETDATA.localStorage.current[key.toString()] = value;
			NETDATA.localStorage.callback[key.toString()] = callback;
		}

		if(typeof Storage !== "undefined" && typeof localStorage === 'object') {
			// console.log('localStorage: saving "' + key.toString() + '" with value "' + JSON.stringify(value) + '"');
			try {
				localStorage.setItem(key.toString(), JSON.stringify(value));
			}
			catch(e) {
				console.log('localStorage: failed to save "' + key.toString() + '" with value: "' + value.toString() + '"');
			}
		}

		NETDATA.localStorage.current[key.toString()] = value;
		return value;
	}

	NETDATA.localStorageGetRecursive = function(obj, prefix, callback) {
		for(var i in obj) {
			if(typeof obj[i] === 'object') {
				//console.log('object ' + prefix + '.' + i.toString());
				NETDATA.localStorageGetRecursive(obj[i], prefix + '.' + i.toString(), callback);
				continue;
			}

			obj[i] = NETDATA.localStorageGet(prefix + '.' + i.toString(), obj[i], callback);
		}
	}

	NETDATA.setOption = function(key, value) {
		if(key.toString() === 'setOptionCallback') {
			if(typeof NETDATA.options.current.setOptionCallback === 'function') {
				NETDATA.options.current[key.toString()] = value;
				NETDATA.options.current.setOptionCallback();
			}
		}
		else if(NETDATA.options.current[key.toString()] !== value) {
			var name = 'options.' + key.toString();

			if(typeof NETDATA.localStorage.default[name.toString()] === 'undefined')
				console.log('localStorage: setOption() on unsaved option: "' + name.toString() + '", value: ' + value);

			//console.log(NETDATA.localStorage);
			//console.log('setOption: setting "' + key.toString() + '" to "' + value + '" of type ' + typeof(value) + ' original type ' + typeof(NETDATA.options.current[key.toString()]));
			//console.log(NETDATA.options);
			NETDATA.options.current[key.toString()] = NETDATA.localStorageSet(name.toString(), value, null);

			if(typeof NETDATA.options.current.setOptionCallback === 'function')
				NETDATA.options.current.setOptionCallback();
		}

		return true;
	}

	NETDATA.getOption = function(key) {
		return NETDATA.options.current[key.toString()];
	}

	// read settings from local storage
	NETDATA.localStorageGetRecursive(NETDATA.options.current, 'options', null);

	// always start with this option enabled.
	NETDATA.setOption('stop_updates_when_focus_is_lost', true);

	NETDATA.resetOptions = function() {
		for(var i in NETDATA.localStorage.default) {
			var a = i.split('.');

			if(a[0] === 'options') {
				if(a[1] === 'setOptionCallback') continue;
				if(typeof NETDATA.localStorage.default[i] === 'undefined') continue;
				if(NETDATA.options.current[i] === NETDATA.localStorage.default[i]) continue;

				NETDATA.setOption(a[1], NETDATA.localStorage.default[i]);
			}
			else if(a[0] === 'chart_heights') {
				if(typeof NETDATA.localStorage.callback[i] === 'function' && typeof NETDATA.localStorage.default[i] !== 'undefined') {
					NETDATA.localStorage.callback[i](NETDATA.localStorage.default[i]);
				}
			}
		}
	}

	// ----------------------------------------------------------------------------------------------------------------

	if(NETDATA.options.debug.main_loop === true)
		console.log('welcome to NETDATA');

	NETDATA.onresize = function() {
		NETDATA.options.last_resized = new Date().getTime();
		NETDATA.onscroll();
	};

	NETDATA.onscroll = function() {
		// console.log('onscroll');

		NETDATA.options.last_page_scroll = new Date().getTime();
		if(NETDATA.options.targets === null) return;

		// when the user scrolls he sees that we have
		// hidden all the not-visible charts
		// using this little function we try to switch
		// the charts back to visible quickly
		var targets = NETDATA.options.targets;
		var len = targets.length;
		while(len--) targets[len].isVisible();
	};

	window.onresize = NETDATA.onresize;
	window.onscroll = NETDATA.onscroll;

	// ----------------------------------------------------------------------------------------------------------------
	// Error Handling

	NETDATA.errorCodes = {
		100: { message: "Cannot load chart library", alert: true },
		101: { message: "Cannot load jQuery", alert: true },
		402: { message: "Chart library not found", alert: false },
		403: { message: "Chart library not enabled/is failed", alert: false },
		404: { message: "Chart not found", alert: false }
	};
	NETDATA.errorLast = {
		code: 0,
		message: "",
		datetime: 0
	};

	NETDATA.error = function(code, msg) {
		NETDATA.errorLast.code = code;
		NETDATA.errorLast.message = msg;
		NETDATA.errorLast.datetime = new Date().getTime();

		console.log("ERROR " + code + ": " + NETDATA.errorCodes[code].message + ": " + msg);

		if(NETDATA.errorCodes[code].alert)
			alert("ERROR " + code + ": " + NETDATA.errorCodes[code].message + ": " + msg);
	}

	NETDATA.errorReset = function() {
		NETDATA.errorLast.code = 0;
		NETDATA.errorLast.message = "You are doing fine!";
		NETDATA.errorLast.datetime = 0;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Chart Registry

	// When multiple charts need the same chart, we avoid downloading it
	// multiple times (and having it in browser memory multiple time)
	// by using this registry.

	// Every time we download a chart definition, we save it here with .add()
	// Then we try to get it back with .get(). If that fails, we download it.

	NETDATA.chartRegistry = {
		charts: {},

		fixid: function(id) {
			return id.replace(/:/g, "_").replace(/\//g, "_");
		},

		add: function(host, id, data) {
			host = this.fixid(host);
			id   = this.fixid(id);

			if(typeof this.charts[host] === 'undefined')
				this.charts[host] = {};

			//console.log('added ' + host + '/' + id);
			this.charts[host][id] = data;
		},

		get: function(host, id) {
			host = this.fixid(host);
			id   = this.fixid(id);

			if(typeof this.charts[host] === 'undefined')
				return null;

			if(typeof this.charts[host][id] === 'undefined')
				return null;

			//console.log('cached ' + host + '/' + id);
			return this.charts[host][id];
		},

		downloadAll: function(host, callback) {
			while(host.slice(-1) === '/')
				host = host.substring(0, host.length - 1);

			var self = this;

			$.ajax({
				url: host + '/api/v1/charts',
				crossDomain: NETDATA.options.crossDomainAjax,
				async: true,
				cache: false
			})
			.done(function(data) {
				var h = NETDATA.chartRegistry.fixid(host);
				//console.log('downloaded all charts from ' + host + ' (' + h + ')');
				self.charts[h] = data.charts;
				if(typeof callback === 'function')
					callback(data);
			})
			.fail(function() {
				if(typeof callback === 'function')
					callback(null);
			});
		}
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Global Pan and Zoom on charts

	// Using this structure are synchronize all the charts, so that
	// when you pan or zoom one, all others are automatically refreshed
	// to the same timespan.

	NETDATA.globalPanAndZoom = {
		seq: 0,					// timestamp ms
								// every time a chart is panned or zoomed
								// we set the timestamp here
								// then we use it as a sequence number
								// to find if other charts are syncronized
								// to this timerange

		master: null,			// the master chart (state), to which all others
								// are synchronized

		force_before_ms: null,	// the timespan to sync all other charts 
		force_after_ms: null,

		// set a new master
		setMaster: function(state, after, before) {
			if(NETDATA.options.current.sync_pan_and_zoom === false)
				return;

			if(this.master !== null && this.master !== state)
				this.master.resetChart(true, true);

			var now = new Date().getTime();
			this.master = state;
			this.seq = now;
			this.force_after_ms = after;
			this.force_before_ms = before;
			NETDATA.options.auto_refresher_stop_until = now + NETDATA.options.current.global_pan_sync_time;
		},

		// clear the master
		clearMaster: function() {
			if(this.master !== null) {
				var st = this.master;
				this.master = null;
				st.resetChart();
			}

			this.master = null;
			this.seq = 0;
			this.force_after_ms = null;
			this.force_before_ms = null;
			NETDATA.options.auto_refresher_stop_until = 0;
		},

		// is the given state the master of the global
		// pan and zoom sync?
		isMaster: function(state) {
			if(this.master === state) return true;
			return false;
		},

		// are we currently have a global pan and zoom sync?
		isActive: function() {
			if(this.master !== null && this.force_before_ms !== null && this.force_after_ms !== null && this.seq !== 0) return true;
			return false;
		},

		// check if a chart, other than the master
		// needs to be refreshed, due to the global pan and zoom
		shouldBeAutoRefreshed: function(state) {
			if(this.master === null || this.seq === 0)
				return false;

			//if(state.needsRecreation())
			//	return true;

			if(state.tm.pan_and_zoom_seq === this.seq)
				return false;

			return true;
		}
	}

	// ----------------------------------------------------------------------------------------------------------------
	// dimensions selection

	// FIXME
	// move color assignment to dimensions, here

	dimensionStatus = function(parent, label, name_div, value_div, color) {
		this.enabled = false;
		this.parent = parent;
		this.label = label;
		this.name_div = null;
		this.value_div = null;
		this.color = NETDATA.themes.current.foreground;

		if(parent.selected === parent.unselected)
			this.selected = true;
		else
			this.selected = false;

		this.setOptions(name_div, value_div, color);
	}

	dimensionStatus.prototype.invalidate = function() {
		this.name_div = null;
		this.value_div = null;
		this.enabled = false;
	}

	dimensionStatus.prototype.setOptions = function(name_div, value_div, color) {
		this.color = color;

		if(this.name_div != name_div) {
			this.name_div = name_div;
			this.name_div.title = this.label;
			this.name_div.style.color = this.color;
			if(this.selected === false)
				this.name_div.className = 'netdata-legend-name not-selected';
			else
				this.name_div.className = 'netdata-legend-name selected';
		}

		if(this.value_div != value_div) {
			this.value_div = value_div;
			this.value_div.title = this.label;
			this.value_div.style.color = this.color;
			if(this.selected === false)
				this.value_div.className = 'netdata-legend-value not-selected';
			else
				this.value_div.className = 'netdata-legend-value selected';
		}

		this.enabled = true;
		this.setHandler();
	}

	dimensionStatus.prototype.setHandler = function() {
		if(this.enabled === false) return;

		var ds = this;

		// this.name_div.onmousedown = this.value_div.onmousedown = function(e) {
		this.name_div.onclick = this.value_div.onclick = function(e) {
			e.preventDefault();
			if(ds.isSelected()) {
				// this is selected
				if(e.shiftKey === true || e.ctrlKey === true) {
					// control or shift key is pressed -> unselect this (except is none will remain selected, in which case select all)
					ds.unselect();

					if(ds.parent.countSelected() === 0)
						ds.parent.selectAll();
				}
				else {
					// no key is pressed -> select only this (except if it is the only selected already, in which case select all)
					if(ds.parent.countSelected() === 1) {
						ds.parent.selectAll();
					}
					else {
						ds.parent.selectNone();
						ds.select();
					}
				}
			}
			else {
				// this is not selected
				if(e.shiftKey === true || e.ctrlKey === true) {
					// control or shift key is pressed -> select this too
					ds.select();
				}
				else {
					// no key is pressed -> select only this
					ds.parent.selectNone();
					ds.select();
				}
			}

			ds.parent.state.redrawChart();
		}
	}

	dimensionStatus.prototype.select = function() {
		if(this.enabled === false) return;

		this.name_div.className = 'netdata-legend-name selected';
		this.value_div.className = 'netdata-legend-value selected';
		this.selected = true;
	}

	dimensionStatus.prototype.unselect = function() {
		if(this.enabled === false) return;

		this.name_div.className = 'netdata-legend-name not-selected';
		this.value_div.className = 'netdata-legend-value hidden';
		this.selected = false;
	}

	dimensionStatus.prototype.isSelected = function() {
		return(this.enabled === true && this.selected === true);
	}

	// ----------------------------------------------------------------------------------------------------------------

	dimensionsVisibility = function(state) {
		this.state = state;
		this.len = 0;
		this.dimensions = {};
		this.selected_count = 0;
		this.unselected_count = 0;
	}

	dimensionsVisibility.prototype.dimensionAdd = function(label, name_div, value_div, color) {
		if(typeof this.dimensions[label] === 'undefined') {
			this.len++;
			this.dimensions[label] = new dimensionStatus(this, label, name_div, value_div, color);
		}
		else
			this.dimensions[label].setOptions(name_div, value_div, color);

		return this.dimensions[label];
	}

	dimensionsVisibility.prototype.dimensionGet = function(label) {
		return this.dimensions[label];
	}

	dimensionsVisibility.prototype.invalidateAll = function() {
		for(var d in this.dimensions)
			this.dimensions[d].invalidate();
	}

	dimensionsVisibility.prototype.selectAll = function() {
		for(var d in this.dimensions)
			this.dimensions[d].select();
	}

	dimensionsVisibility.prototype.countSelected = function() {
		var i = 0;
		for(var d in this.dimensions)
			if(this.dimensions[d].isSelected()) i++;

		return i;
	}

	dimensionsVisibility.prototype.selectNone = function() {
		for(var d in this.dimensions)
			this.dimensions[d].unselect();
	}

	dimensionsVisibility.prototype.selected2BooleanArray = function(array) {
		var ret = new Array();
		this.selected_count = 0;
		this.unselected_count = 0;

		for(var i = 0, len = array.length; i < len ; i++) {
			var ds = this.dimensions[array[i]];
			if(typeof ds === 'undefined') {
				// console.log(array[i] + ' is not found');
				ret.push(false);
				continue;
			}

			if(ds.isSelected()) {
				ret.push(true);
				this.selected_count++;
			}
			else {
				ret.push(false);
				this.unselected_count++;
			}
		}

		if(this.selected_count === 0 && this.unselected_count !== 0) {
			this.selectAll();
			return this.selected2BooleanArray(array);
		}

		return ret;
	}


	// ----------------------------------------------------------------------------------------------------------------
	// global selection sync

	NETDATA.globalSelectionSync = {
		state: null,
		dont_sync_before: 0,
		last_t: 0,
		slaves: [],

		stop: function() {
			if(this.state !== null)
				this.state.globalSelectionSyncStop();
		},

		delay: function() {
			if(this.state !== null) {
				this.state.globalSelectionSyncDelay();
			}
		}
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Our state object, where all per-chart values are stored

	chartState = function(element) {
		var self = $(element);
		this.element = element;

		// IMPORTANT:
		// all private functions should use 'that', instead of 'this'
		var that = this;

		/* error() - private
		 * show an error instead of the chart
		 */
		var error = function(msg) {
			that.element.innerHTML = that.id + ': ' + msg;
			that.enabled = false;
			that.current = that.pan;
		}

		// GUID - a unique identifier for the chart
		this.uuid = NETDATA.guid();

		// string - the name of chart
		this.id = self.data('netdata');

		// string - the key for localStorage settings
		this.settings_id = self.data('id') || null;

		// the user given dimensions of the element
		this.width = self.data('width') || NETDATA.chartDefaults.width;
		this.height = self.data('height') || NETDATA.chartDefaults.height;

		if(this.settings_id !== null) {
			this.height = NETDATA.localStorageGet('chart_heights.' + this.settings_id, this.height, function(height) {
				// this is the callback that will be called
				// if and when the user resets all localStorage variables
				// to their defaults

				resizeChartToHeight(height);
			});
		}

		// string - the netdata server URL, without any path
		this.host = self.data('host') || NETDATA.chartDefaults.host;

		// make sure the host does not end with /
		// all netdata API requests use absolute paths
		while(this.host.slice(-1) === '/')
			this.host = this.host.substring(0, this.host.length - 1);

		// string - the grouping method requested by the user
		this.method = self.data('method') || NETDATA.chartDefaults.method;

		// the time-range requested by the user
		this.after = self.data('after') || NETDATA.chartDefaults.after;
		this.before = self.data('before') || NETDATA.chartDefaults.before;

		// the pixels per point requested by the user
		this.pixels_per_point = self.data('pixels-per-point') || 1;
		this.points = self.data('points') || null;

		// the dimensions requested by the user
		this.dimensions = self.data('dimensions') || null;

		// the chart library requested by the user
		this.library_name = self.data('chart-library') || NETDATA.chartDefaults.library;

		// object - the chart library used
		this.library = null;

		// color management
		this.colors = null;
		this.colors_assigned = {};
		this.colors_available = null;

		// the element already created by the user
		this.element_message = null;

		// the element with the chart
		this.element_chart = null;

		// the element with the legend of the chart (if created by us)
		this.element_legend = null;
		this.element_legend_childs = {
			hidden: null,
			title_date: null,
			title_time: null,
			title_units: null,
			nano: null,
			nano_options: null,
			series: null
		};

		this.chart_url = null;						// string - the url to download chart info
		this.chart = null;							// object - the chart as downloaded from the server

		this.title = self.data('title') || null;	// the title of the chart
		this.units = self.data('units') || null;	// the units of the chart dimensions
		this.append_options = self.data('append-options') || null;	// the units of the chart dimensions

		this.validated = false; 					// boolean - has the chart been validated?
		this.enabled = true; 						// boolean - is the chart enabled for refresh?
		this.paused = false;						// boolean - is the chart paused for any reason?
		this.selected = false;						// boolean - is the chart shown a selection?
		this.debug = false;							// boolean - console.log() debug info about this chart

		this.netdata_first = 0;						// milliseconds - the first timestamp in netdata
		this.netdata_last = 0;						// milliseconds - the last timestamp in netdata
		this.requested_after = null;				// milliseconds - the timestamp of the request after param
		this.requested_before = null;				// milliseconds - the timestamp of the request before param
		this.requested_padding = null;
		this.view_after = 0;
		this.view_before = 0;

		this.auto = {
			name: 'auto',
			autorefresh: true,
			force_update_at: 0, // the timestamp to force the update at
			force_before_ms: null,
			force_after_ms: null
		};
		this.pan = {
			name: 'pan',
			autorefresh: false,
			force_update_at: 0, // the timestamp to force the update at
			force_before_ms: null,
			force_after_ms: null
		};
		this.zoom = {
			name: 'zoom',
			autorefresh: false,
			force_update_at: 0, // the timestamp to force the update at
			force_before_ms: null,
			force_after_ms: null
		};

		// this is a pointer to one of the sub-classes below
		// auto, pan, zoom
		this.current = this.auto;

		// check the requested library is available
		// we don't initialize it here - it will be initialized when
		// this chart will be first used
		if(typeof NETDATA.chartLibraries[that.library_name] === 'undefined') {
			NETDATA.error(402, that.library_name);
			error('chart library "' + that.library_name + '" is not found');
			return;
		}
		else if(NETDATA.chartLibraries[that.library_name].enabled === false) {
			NETDATA.error(403, that.library_name);
			error('chart library "' + that.library_name + '" is not enabled');
			return;
		}
		else
			that.library = NETDATA.chartLibraries[that.library_name];

		// milliseconds - the time the last refresh took
		this.refresh_dt_ms = 0;

		// if we need to report the rendering speed
		// find the element that needs to be updated
		var refresh_dt_element_name = self.data('dt-element-name') || null;	// string - the element to print refresh_dt_ms

		if(refresh_dt_element_name !== null)
			this.refresh_dt_element = document.getElementById(refresh_dt_element_name) || null;
		else
			this.refresh_dt_element = null;

		this.dimensions_visibility = new dimensionsVisibility(this);

		this._updating = false;

		// ============================================================================================================
		// PRIVATE FUNCTIONS

		var createDOM = function() {
			if(that.enabled === false) return;

			if(that.element_message !== null) that.element_message.innerHTML = '';
			if(that.element_legend !== null) that.element_legend.innerHTML = '';
			if(that.element_chart !== null) that.element_chart.innerHTML = '';

			that.element.innerHTML = '';

			that.element_message = document.createElement('div');
			that.element_message.className = ' netdata-message hidden';
			that.element.appendChild(that.element_message);

			that.element_chart = document.createElement('div');
			that.element_chart.id = that.library_name + '-' + that.uuid + '-chart';
			that.element.appendChild(that.element_chart);

			if(that.hasLegend() === true) {
				that.element.className = "netdata-container-with-legend";
				that.element_chart.className = 'netdata-chart-with-legend-right netdata-' + that.library_name + '-chart-with-legend-right';

				that.element_legend = document.createElement('div');
				that.element_legend.className = 'netdata-chart-legend netdata-' + that.library_name + '-legend';
				that.element.appendChild(that.element_legend);
			}
			else {
				that.element.className = "netdata-container";
				that.element_chart.className = ' netdata-chart netdata-' + that.library_name + '-chart';

				that.element_legend = null;
			}
			that.element_legend_childs.series = null;

			if(typeof(that.width) === 'string')
				$(that.element).css('width', that.width);
			else if(typeof(that.width) === 'number')
				$(that.element).css('width', that.width + 'px');

			if(typeof(that.library.aspect_ratio) === 'undefined') {
				if(typeof(that.height) === 'string')
					$(that.element).css('height', that.height);
				else if(typeof(that.height) === 'number')
					$(that.element).css('height', that.height + 'px');
			}
			else {
				var w = that.element.offsetWidth;
				if(w === null || w === 0) {
					// the div is hidden
					// this is resize the chart when next viewed
					that.tm.last_resized = 0;
				}
				else
					$(that.element).css('height', (that.element.offsetWidth * that.library.aspect_ratio / 100).toString() + 'px');
			}

			if(NETDATA.chartDefaults.min_width !== null)
				$(that.element).css('min-width', NETDATA.chartDefaults.min_width);

			that.tm.last_dom_created = new Date().getTime();

			showLoading();
		}

		/* init() private
		 * initialize state viariables
		 * destroy all (possibly) created state elements
		 * create the basic DOM for a chart
		 */
		var init = function() {
			if(that.enabled === false) return;

			that.paused = false;
			that.selected = false;

			that.chart_created = false;			// boolean - is the library.create() been called?
			that.updates_counter = 0;			// numeric - the number of refreshes made so far
			that.updates_since_last_unhide = 0;	// numeric - the number of refreshes made since the last time the chart was unhidden
			that.updates_since_last_creation = 0; // numeric - the number of refreshes made since the last time the chart was created

			that.tm = {
				last_initialized: 0,		// milliseconds - the timestamp it was last initialized
				last_dom_created: 0,		// milliseconds - the timestamp its DOM was last created
				last_mode_switch: 0,		// milliseconds - the timestamp it switched modes

				last_info_downloaded: 0,	// milliseconds - the timestamp we downloaded the chart
				last_updated: 0,			// the timestamp the chart last updated with data
				pan_and_zoom_seq: 0,		// the sequence number of the global synchronization
											// between chart.
											// Used with NETDATA.globalPanAndZoom.seq
				last_visible_check: 0,		// the time we last checked if it is visible
				last_resized: 0,			// the time the chart was resized
				last_hidden: 0,				// the time the chart was hidden
				last_unhidden: 0,			// the time the chart was unhidden
				last_autorefreshed: 0		// the time the chart was last refreshed
			},

			that.data = null;				// the last data as downloaded from the netdata server
			that.data_url = 'invalid://';	// string - the last url used to update the chart
			that.data_points = 0;			// number - the number of points returned from netdata
			that.data_after = 0;			// milliseconds - the first timestamp of the data
			that.data_before = 0;			// milliseconds - the last timestamp of the data
			that.data_update_every = 0;		// milliseconds - the frequency to update the data

			that.tm.last_initialized = new Date().getTime();
			createDOM();

			that.setMode('auto');
		}

		var maxMessageFontSize = function() {
			// normally we want a font size, as tall as the element
			var h = that.element_message.clientHeight;

			// but give it some air, 20% let's say, or 5 pixels min
			var lost = Math.max(h * 0.2, 5);
			h -= lost;

			// center the text, verically
			var paddingTop = (lost - 5) / 2;

			// but check the width too
			// it should fit 10 characters in it
			var w = that.element_message.clientWidth / 10;
			if(h > w) {
				paddingTop += (h - w) / 2;
				h = w;
			}

			// and don't make it too huge
			// 5% of the screen size is good
			if(h > screen.height / 20) {
				paddingTop += (h - (screen.height / 20)) / 2;
				h = screen.height / 20;
			}

			// set it
			that.element_message.style.fontSize = h.toString() + 'px';
			that.element_message.style.paddingTop = paddingTop.toString() + 'px';
		}

		var showMessage = function(msg) {
			that.element_message.className = 'netdata-message';
			that.element_message.innerHTML = msg;
			this.element_message.style.fontSize = 'x-small';
			that.element_message.style.paddingTop = '0px';
			that.___messageHidden___ = undefined;
		}

		var showMessageIcon = function(icon) {
			that.element_message.innerHTML = icon;
			that.element_message.className = 'netdata-message icon';
			maxMessageFontSize();
			that.___messageHidden___ = undefined;
		}

		var hideMessage = function() {
			if(typeof that.___messageHidden___ === 'undefined') {
				that.___messageHidden___ = true;
				that.element_message.className = 'netdata-message hidden';
			}
		}

		var showRendering = function() {
			var icon;
			if(that.chart !== null) {
				if(that.chart.chart_type === 'line')
					icon = '<i class="fa fa-line-chart"></i>';
				else
					icon = '<i class="fa fa-area-chart"></i>';
			}
			else
				icon = '<i class="fa fa-area-chart"></i>';

			showMessageIcon(icon + ' netdata');
		}

		var showLoading = function() {
			if(that.chart_created === false) {
				showMessageIcon('<i class="fa fa-refresh"></i> netdata');
				return true;
			}
			return false;
		}

		var isHidden = function() {
			if(typeof that.___chartIsHidden___ !== 'undefined')
				return true;

			return false;
		}

		// hide the chart, when it is not visible - called from isVisible()
		var hideChart = function() {
			// hide it, if it is not already hidden
			if(isHidden() === true) return;

			if(that.chart_created === true) {
				// we should destroy it
				if(NETDATA.options.current.destroy_on_hide === true) {
					init();
				}
				else {
					showRendering();
					that.element_chart.style.display = 'none';
					if(that.element_legend !== null) that.element_legend.style.display = 'none';
					that.tm.last_hidden = new Date().getTime();
				}
			}
			
			that.___chartIsHidden___ = true;
		}

		// unhide the chart, when it is visible - called from isVisible()
		var unhideChart = function() {
			if(isHidden() === false) return;

			that.___chartIsHidden___ = undefined;
			that.updates_since_last_unhide = 0;

			if(that.chart_created === false) {
				// we need to re-initialize it, to show our background
				// logo in bootstrap tabs, until the chart loads
				init();
			}
			else {
				that.tm.last_unhidden = new Date().getTime();
				that.element_chart.style.display = '';
				if(that.element_legend !== null) that.element_legend.style.display = '';
				resizeChart();
				hideMessage();
			}
		}

		var canBeRendered = function() {
			if(isHidden() === true || that.isVisible(true) === false)
				return false;

			return true;
		}

		// https://github.com/petkaantonov/bluebird/wiki/Optimization-killers
		var callChartLibraryUpdateSafely = function(data) {
			var status;

			if(canBeRendered() === false)
				return false;

			if(NETDATA.options.debug.chart_errors === true)
				status = that.library.update(that, data);
			else {
				try {
					status = that.library.update(that, data);
				}
				catch(err) {
					status = false;
				}
			}

			if(status === false) {
				error('chart failed to be updated as ' + that.library_name);
				return false;
			}

			return true;
		}

		// https://github.com/petkaantonov/bluebird/wiki/Optimization-killers
		var callChartLibraryCreateSafely = function(data) {
			var status;

			if(canBeRendered() === false)
				return false;

			if(NETDATA.options.debug.chart_errors === true)
				status = that.library.create(that, data);
			else {
				try {
					status = that.library.create(that, data);
				}
				catch(err) {
					status = false;
				}
			}

			if(status === false) {
				error('chart failed to be created as ' + that.library_name);
				return false;
			}

			that.chart_created = true;
			that.updates_since_last_creation = 0;
			return true;
		}

		// ----------------------------------------------------------------------------------------------------------------
		// Chart Resize

		// resizeChart() - private
		// to be called just before the chart library to make sure that
		// a properly sized dom is available
		var resizeChart = function() {
			if(that.isVisible() === true && that.tm.last_resized < NETDATA.options.last_resized) {
				if(that.chart_created === false) return;

				if(that.needsRecreation()) {
					init();
				}
				else if(typeof that.library.resize === 'function') {
					that.library.resize(that);

					if(that.element_legend_childs.nano !== null && that.element_legend_childs.nano_options !== null)
						$(that.element_legend_childs.nano).nanoScroller();

					maxMessageFontSize();
				}

				that.tm.last_resized = new Date().getTime();
			}
		}

		// this is the actual chart resize algorithm
		// it will:
		// - resize the entire container
		// - update the internal states
		// - resize the chart as the div changes height
		// - update the scrollbar of the legend
		var resizeChartToHeight = function(h) {
			// console.log(h);
			that.element.style.height = h;

			if(that.settings_id !== null)
				NETDATA.localStorageSet('chart_heights.' + that.settings_id, h);

			var now = new Date().getTime();
			NETDATA.options.last_page_scroll = now;
			NETDATA.options.auto_refresher_stop_until = now + NETDATA.options.current.stop_updates_while_resizing;

			// force a resize
			that.tm.last_resized = 0;
			resizeChart();
		};

		this.resizeHandler = function(e) {
			e.preventDefault();

			if(typeof this.event_resize === 'undefined'
				|| this.event_resize.chart_original_w === 'undefined'
				|| this.event_resize.chart_original_h === 'undefined')
				this.event_resize = {
					chart_original_w: this.element.clientWidth,
					chart_original_h: this.element.clientHeight,
					last: 0
				};

			if(e.type === 'touchstart') {
				this.event_resize.mouse_start_x = e.touches.item(0).pageX;
				this.event_resize.mouse_start_y = e.touches.item(0).pageY;
			}
			else {
				this.event_resize.mouse_start_x = e.clientX;
				this.event_resize.mouse_start_y = e.clientY;
			}

			this.event_resize.chart_start_w = this.element.clientWidth;
			this.event_resize.chart_start_h = this.element.clientHeight;
			this.event_resize.chart_last_w = this.element.clientWidth;
			this.event_resize.chart_last_h = this.element.clientHeight;

			var now = new Date().getTime();
			if(now - this.event_resize.last <= NETDATA.options.current.double_click_speed) {
				// double click / double tap event

				// the optimal height of the chart
				// showing the entire legend
				var optimal = this.event_resize.chart_last_h
						+ this.element_legend_childs.content.scrollHeight
						- this.element_legend_childs.content.clientHeight;

				// if we are not optimal, be optimal
				if(this.event_resize.chart_last_h != optimal)
					resizeChartToHeight(optimal.toString() + 'px');

				// else if we do not have the original height
				// reset to the original height
				else if(this.event_resize.chart_last_h != this.event_resize.chart_original_h)
					resizeChartToHeight(this.event_resize.chart_original_h.toString() + 'px');
			}
			else {
				this.event_resize.last = now;

				// process movement event
				document.onmousemove =
				document.ontouchmove =
				this.element_legend_childs.resize_handler.onmousemove =
				this.element_legend_childs.resize_handler.ontouchmove =
					function(e) {
						var y = null;

						switch(e.type) {
							case 'mousemove': y = e.clientY; break;
							case 'touchmove': y = e.touches.item(e.touches - 1).pageY; break;
						}

						if(y !== null) {
							var	newH = that.event_resize.chart_start_h + y - that.event_resize.mouse_start_y;

							if(newH >= 70 && newH !== that.event_resize.chart_last_h) {
								resizeChartToHeight(newH.toString() + 'px');
								that.event_resize.chart_last_h = newH;
							}
						}
					};

				// process end event
				document.onmouseup = 
				document.ontouchend = 
				this.element_legend_childs.resize_handler.onmouseup =
				this.element_legend_childs.resize_handler.ontouchend =
					function(e) {
						// remove all the hooks
						document.onmouseup =
						document.onmousemove =
						document.ontouchmove =
						document.ontouchend =
						that.element_legend_childs.resize_handler.onmousemove =
						that.element_legend_childs.resize_handler.ontouchmove =
						that.element_legend_childs.resize_handler.onmouseout =
						that.element_legend_childs.resize_handler.onmouseup =
						that.element_legend_childs.resize_handler.ontouchend =
							null;

						// allow auto-refreshes
						NETDATA.options.auto_refresher_stop_until = 0;
					};
			}
		}


		var noDataToShow = function() {
			showMessageIcon('<i class="fa fa-warning"></i> empty');
			that.legendUpdateDOM();
			that.tm.last_autorefreshed = new Date().getTime();
			// that.data_update_every = 30 * 1000;
			//that.element_chart.style.display = 'none';
			//if(that.element_legend !== null) that.element_legend.style.display = 'none';
			//that.___chartIsHidden___ = true;
		}

		// ============================================================================================================
		// PUBLIC FUNCTIONS

		this.error = function(msg) {
			error(msg);
		}

		this.setMode = function(m) {
			if(this.current !== null && this.current.name === m) return;

			if(m === 'auto')
				this.current = this.auto;
			else if(m === 'pan')
				this.current = this.pan;
			else if(m === 'zoom')
				this.current = this.zoom;
			else
				this.current = this.auto;

			this.current.force_update_at = 0;
			this.current.force_before_ms = null;
			this.current.force_after_ms = null;

			this.tm.last_mode_switch = new Date().getTime();
		}

		// ----------------------------------------------------------------------------------------------------------------
		// global selection sync

		// prevent to global selection sync for some time
		this.globalSelectionSyncDelay = function(ms) {
			if(NETDATA.options.current.sync_selection === false)
				return;

			if(typeof ms === 'number')
				NETDATA.globalSelectionSync.dont_sync_before = new Date().getTime() + ms;
			else
				NETDATA.globalSelectionSync.dont_sync_before = new Date().getTime() + NETDATA.options.current.sync_selection_delay;
		}

		// can we globally apply selection sync?
		this.globalSelectionSyncAbility = function() {
			if(NETDATA.options.current.sync_selection === false)
				return false;

			if(NETDATA.globalSelectionSync.dont_sync_before > new Date().getTime())
				return false;

			return true;
		}

		this.globalSelectionSyncIsMaster = function() {
			if(NETDATA.globalSelectionSync.state === this)
				return true;
			else
				return false;
		}

		// this chart is the master of the global selection sync
		this.globalSelectionSyncBeMaster = function() {
			// am I the master?
			if(this.globalSelectionSyncIsMaster()) {
				if(this.debug === true)
					this.log('sync: I am the master already.');

				return;
			}

			if(NETDATA.globalSelectionSync.state) {
				if(this.debug === true)
					this.log('sync: I am not the sync master. Resetting global sync.');

				this.globalSelectionSyncStop();
			}

			// become the master
			if(this.debug === true)
				this.log('sync: becoming sync master.');

			this.selected = true;
			NETDATA.globalSelectionSync.state = this;

			// find the all slaves
			var targets = NETDATA.options.targets;
			var len = targets.length;
			while(len--) {
				st = targets[len];

				if(st === this) {
					if(this.debug === true)
						st.log('sync: not adding me to sync');
				}
				else if(st.globalSelectionSyncIsEligible()) {
					if(this.debug === true)
						st.log('sync: adding to sync as slave');

					st.globalSelectionSyncBeSlave();
				}
			}

			// this.globalSelectionSyncDelay(100);
		}

		// can the chart participate to the global selection sync as a slave?
		this.globalSelectionSyncIsEligible = function() {
			if(this.enabled === true
				&& this.library !== null
				&& typeof this.library.setSelection === 'function'
				&& this.isVisible() === true
				&& this.chart_created === true)
				return true;

			return false;
		}

		// this chart becomes a slave of the global selection sync
		this.globalSelectionSyncBeSlave = function() {
			if(NETDATA.globalSelectionSync.state !== this)
				NETDATA.globalSelectionSync.slaves.push(this);
		}

		// sync all the visible charts to the given time
		// this is to be called from the chart libraries
		this.globalSelectionSync = function(t) {
			if(this.globalSelectionSyncAbility() === false) {
				if(this.debug === true)
					this.log('sync: cannot sync (yet?).');

				return;
			}

			if(this.globalSelectionSyncIsMaster() === false) {
				if(this.debug === true)
					this.log('sync: trying to be sync master.');

				this.globalSelectionSyncBeMaster();

				if(this.globalSelectionSyncAbility() === false) {
					if(this.debug === true)
						this.log('sync: cannot sync (yet?).');

					return;
				}
			}

			NETDATA.globalSelectionSync.last_t = t;
			$.each(NETDATA.globalSelectionSync.slaves, function(i, st) {
				st.setSelection(t);
			});
		}

		// stop syncing all charts to the given time
		this.globalSelectionSyncStop = function() {
			if(NETDATA.globalSelectionSync.slaves.length) {
				if(this.debug === true)
					this.log('sync: cleaning up...');

				$.each(NETDATA.globalSelectionSync.slaves, function(i, st) {
					if(st === that) {
						if(that.debug === true)
							st.log('sync: not adding me to sync stop');
					}
					else {
						if(that.debug === true)
							st.log('sync: removed slave from sync');

						st.clearSelection();
					}
				});

				NETDATA.globalSelectionSync.last_t = 0;
				NETDATA.globalSelectionSync.slaves = [];
				NETDATA.globalSelectionSync.state = null;
			}

			this.clearSelection();
		}

		this.setSelection = function(t) {
			if(typeof this.library.setSelection === 'function') {
				if(this.library.setSelection(this, t) === true)
					this.selected = true;
				else
					this.selected = false;
			}
			else this.selected = true;

			if(this.selected === true && this.debug === true)
				this.log('selection set to ' + t.toString());

			return this.selected;
		}

		this.clearSelection = function() {
			if(this.selected === true) {
				if(typeof this.library.clearSelection === 'function') {
					if(this.library.clearSelection(this) === true)
						this.selected = false;
					else
						this.selected = true;
				}
				else this.selected = false;

				if(this.selected === false && this.debug === true)
					this.log('selection cleared');

				this.legendReset();
			}

			return this.selected;
		}

		// find if a timestamp (ms) is shown in the current chart
		this.timeIsVisible = function(t) {
			if(t >= this.data_after && t <= this.data_before)
				return true;
			return false;
		},

		this.calculateRowForTime = function(t) {
			if(this.timeIsVisible(t) === false) return -1;
			return Math.floor((t - this.data_after) / this.data_update_every);
		}

		// ----------------------------------------------------------------------------------------------------------------

		// console logging
		this.log = function(msg) {
			console.log(this.id + ' (' + this.library_name + ' ' + this.uuid + '): ' + msg);
		}

		this.pauseChart = function() {
			if(this.paused === false) {
				if(this.debug === true)
					this.log('pauseChart()');

				this.paused = true;
			}
		}

		this.unpauseChart = function() {
			if(this.paused === true) {
				if(this.debug === true)
					this.log('unpauseChart()');

				this.paused = false;
			}
		}

		this.resetChart = function(dont_clear_master, dont_update) {
			if(this.debug === true)
				this.log('resetChart(' + dont_clear_master + ', ' + dont_update + ') called');

			if(typeof dont_clear_master === 'undefined')
				dont_clear_master = false;

			if(typeof dont_update === 'undefined')
				dont_update = false;

			if(dont_clear_master !== true && NETDATA.globalPanAndZoom.isMaster(this) === true) {
				if(this.debug === true)
					this.log('resetChart() diverting to clearMaster().');
				// this will call us back with master === true
				NETDATA.globalPanAndZoom.clearMaster();
				return;
			}

			this.clearSelection();

			this.tm.pan_and_zoom_seq = 0;

			this.setMode('auto');
			this.current.force_update_at = 0;
			this.current.force_before_ms = null;
			this.current.force_after_ms = null;
			this.tm.last_autorefreshed = 0;
			this.paused = false;
			this.selected = false;
			this.enabled = true;
			// this.debug = false;

			// do not update the chart here
			// or the chart will flip-flop when it is the master
			// of a selection sync and another chart becomes
			// the new master

			if(dont_update !== true && this.isVisible() === true) {
				this.updateChart();
			}
		}

		this.updateChartPanOrZoom = function(after, before) {
			var logme = 'updateChartPanOrZoom(' + after + ', ' + before + '): ';
			var ret = true;

			if(this.debug === true)
				this.log(logme);

			if(before < after) {
				this.log(logme + 'flipped parameters, rejecting it.');
				return false;
			}

			if(typeof this.fixed_min_duration === 'undefined')
				this.fixed_min_duration = Math.round((this.chartWidth() / 30) * this.chart.update_every * 1000);
			
			var min_duration = this.fixed_min_duration;
			var current_duration = Math.round(this.view_before - this.view_after);

			// round the numbers
			after = Math.round(after);
			before = Math.round(before);

			// align them to update_every
			// stretching them further away
			after -= after % this.data_update_every;
			before += this.data_update_every - (before % this.data_update_every);

			// the final wanted duration
			var wanted_duration = before - after;
			
			// to allow panning, accept just a point below our minimum
			if((current_duration - this.data_update_every) < min_duration)
				min_duration = current_duration - this.data_update_every;

			// we do it, but we adjust to minimum size and return false
			// when the wanted size is below the current and the minimum
			// and we zoom
			if(wanted_duration < current_duration && wanted_duration < min_duration) {
				if(this.debug === true)
					this.log(logme + 'too small: min_duration: ' + (min_duration / 1000).toString() + ', wanted: ' + (wanted_duration / 1000).toString());

				min_duration = this.fixed_min_duration;

				var dt = (min_duration - wanted_duration) / 2;
				before += dt;
				after -= dt;
				wanted_duration = before - after;
				ret = false;
			}

			var tolerance = this.data_update_every * 2;
			var movement = Math.abs(before - this.view_before);

			if(Math.abs(current_duration - wanted_duration) <= tolerance && movement <= tolerance && ret === true) {
				if(this.debug === true)
					this.log(logme + 'REJECTING UPDATE: current/min duration: ' + (current_duration / 1000).toString() + '/' + (this.fixed_min_duration / 1000).toString() + ', wanted duration: ' + (wanted_duration / 1000).toString() + ', duration diff: ' + (Math.round(Math.abs(current_duration - wanted_duration) / 1000)).toString() + ', movement: ' + (movement / 1000).toString() + ', tolerance: ' + (tolerance / 1000).toString() + ', returning: ' + false);
				return false;
			}

			if(this.current.name === 'auto') {
				this.log(logme + 'caller called me with mode: ' + this.current.name);
				this.setMode('pan');
			}

			if(this.debug === true)
				this.log(logme + 'ACCEPTING UPDATE: current/min duration: ' + (current_duration / 1000).toString() + '/' + (this.fixed_min_duration / 1000).toString() + ', wanted duration: ' + (wanted_duration / 1000).toString() + ', duration diff: ' + (Math.round(Math.abs(current_duration - wanted_duration) / 1000)).toString() + ', movement: ' + (movement / 1000).toString() + ', tolerance: ' + (tolerance / 1000).toString() + ', returning: ' + ret);

			this.current.force_update_at = new Date().getTime() + NETDATA.options.current.pan_and_zoom_delay;
			this.current.force_after_ms = after;
			this.current.force_before_ms = before;
			NETDATA.globalPanAndZoom.setMaster(this, after, before);
			return ret;
		}

		this.legendFormatValue = function(value) {
			if(value === null || value === 'undefined') return '-';
			if(typeof value !== 'number') return value;

			var abs = Math.abs(value);
			if(abs >= 1000) return (Math.round(value)).toLocaleString();
			if(abs >= 100 ) return (Math.round(value * 10) / 10).toLocaleString();
			if(abs >= 1   ) return (Math.round(value * 100) / 100).toLocaleString();
			if(abs >= 0.1 ) return (Math.round(value * 1000) / 1000).toLocaleString();
			return (Math.round(value * 10000) / 10000).toLocaleString();
		}

		this.legendSetLabelValue = function(label, value) {
			var series = this.element_legend_childs.series[label];
			if(typeof series === 'undefined') return;
			if(series.value === null && series.user === null) return;

			// if the value has not changed, skip DOM update
			//if(series.last === value) return;

			var s, r;
			if(typeof value === 'number') {
				var v = Math.abs(value);
				s = r = this.legendFormatValue(value);

				if(typeof series.last === 'number') {
					if(v > series.last) s += '<i class="fa fa-angle-up" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
					else if(v < series.last) s += '<i class="fa fa-angle-down" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
					else s += '<i class="fa fa-angle-left" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
				}
				else s += '<i class="fa fa-angle-right" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
				series.last = v;
			}
			else {
				s = r = value;
				series.last = value;
			}

			if(series.value !== null) series.value.innerHTML = s;
			if(series.user !== null) series.user.innerHTML = r;
		}

		this.legendSetDate = function(ms) {
			if(typeof ms !== 'number') {
				this.legendShowUndefined();
				return;
			}

			var d = new Date(ms);

			if(this.element_legend_childs.title_date)
				this.element_legend_childs.title_date.innerHTML = d.toLocaleDateString();

			if(this.element_legend_childs.title_time)
				this.element_legend_childs.title_time.innerHTML = d.toLocaleTimeString();

			if(this.element_legend_childs.title_units)
				this.element_legend_childs.title_units.innerHTML = this.units;
		}

		this.legendShowUndefined = function() {
			if(this.element_legend_childs.title_date)
				this.element_legend_childs.title_date.innerHTML = '&nbsp;';

			if(this.element_legend_childs.title_time)
				this.element_legend_childs.title_time.innerHTML = this.chart.name;

			if(this.element_legend_childs.title_units)
				this.element_legend_childs.title_units.innerHTML = '&nbsp;';

			if(this.data && this.element_legend_childs.series !== null) {
				var labels = this.data.dimension_names;
				var i = labels.length;
				while(i--) {
					var label = labels[i];

					if(typeof label === 'undefined') continue;
					if(typeof this.element_legend_childs.series[label] === 'undefined') continue;
					this.legendSetLabelValue(label, null);
				}
			}
		}

		this.legendShowLatestValues = function() {
			if(this.chart === null) return;
			if(this.selected) return;

			if(this.data === null || this.element_legend_childs.series === null) {
				this.legendShowUndefined();
				return;
			}

			var show_undefined = true;
			if(Math.abs(this.netdata_last - this.view_before) <= this.data_update_every)
				show_undefined = false;

			if(show_undefined) {
				this.legendShowUndefined();
				return;
			}

			this.legendSetDate(this.view_before);

			var labels = this.data.dimension_names;
			var i = labels.length;
			while(i--) {
				var label = labels[i];

				if(typeof label === 'undefined') continue;
				if(typeof this.element_legend_childs.series[label] === 'undefined') continue;

				if(show_undefined)
					this.legendSetLabelValue(label, null);
				else
					this.legendSetLabelValue(label, this.data.view_latest_values[i]);
			}
		}

		this.legendReset = function() {
			this.legendShowLatestValues();
		}

		// this should be called just ONCE per dimension per chart
		this._chartDimensionColor = function(label) {
			if(this.colors === null) this.chartColors();

			if(typeof this.colors_assigned[label] === 'undefined') {
				if(this.colors_available.length === 0) {
					for(var i = 0, len = NETDATA.themes.current.colors.length; i < len ; i++)
						this.colors_available.push(NETDATA.themes.current.colors[i]);
				}

				this.colors_assigned[label] = this.colors_available.shift();

				if(this.debug === true)
					this.log('label "' + label + '" got color "' + this.colors_assigned[label]);
			}
			else {
				if(this.debug === true)
					this.log('label "' + label + '" already has color "' + this.colors_assigned[label] + '"');
			}

			this.colors.push(this.colors_assigned[label]);
			return this.colors_assigned[label];
		}

		this.chartColors = function() {
			if(this.colors !== null) return this.colors;

			this.colors = new Array();
			this.colors_available = new Array();

			var c = $(this.element).data('colors');
			// this.log('read colors: ' + c);
			if(typeof c !== 'undefined' && c !== null && c.length > 0) {
				if(typeof c !== 'string') {
					this.log('invalid color given: ' + c + ' (give a space separated list of colors)');
				}
				else {
					c = c.split(' ');
					var added = 0;

					while(added < 20) {
						for(var i = 0, len = c.length; i < len ; i++) {
							added++;
							this.colors_available.push(c[i]);
							// this.log('adding color: ' + c[i]);
						}
					}
				}
			}

			// push all the standard colors too
			for(var i = 0, len = NETDATA.themes.current.colors.length; i < len ; i++)
				this.colors_available.push(NETDATA.themes.current.colors[i]);

			return this.colors;
		}

		this.legendUpdateDOM = function() {
			var needed = false;

			// check that the legend DOM is up to date for the downloaded dimensions
			if(typeof this.element_legend_childs.series !== 'object' || this.element_legend_childs.series === null) {
				// this.log('the legend does not have any series - requesting legend update');
				needed = true;
			}
			else if(this.data === null) {
				// this.log('the chart does not have any data - requesting legend update');
				needed = true;
			}
			else if(typeof this.element_legend_childs.series.labels_key === 'undefined') {
				needed = true;
			}
			else {
				var labels = this.data.dimension_names.toString();
				if(labels !== this.element_legend_childs.series.labels_key) {
					needed = true;

					if(this.debug === true)
						this.log('NEW LABELS: "' + labels + '" NOT EQUAL OLD LABELS: "' + this.element_legend_childs.series.labels_key + '"');
				}
			}

			if(needed === false) {
				// make sure colors available
				this.chartColors();

				// do we have to update the current values?
				// we do this, only when the visible chart is current
				if(Math.abs(this.netdata_last - this.view_before) <= this.data_update_every) {
					if(this.debug === true)
						this.log('chart is in latest position... updating values on legend...');

					//var labels = this.data.dimension_names;
					//var i = labels.length;
					//while(i--)
					//	this.legendSetLabelValue(labels[i], this.data.latest_values[i]);
				}
				return;
			}
			if(this.colors === null) {
				// this is the first time we update the chart
				// let's assign colors to all dimensions
				if(this.library.track_colors() === true)
					for(var dim in this.chart.dimensions)
						this._chartDimensionColor(this.chart.dimensions[dim].name);
			}
			// we will re-generate the colors for the chart
			// based on the selected dimensions
			this.colors = null;

			if(this.debug === true)
				this.log('updating Legend DOM');

			// mark all dimensions as invalid
			this.dimensions_visibility.invalidateAll();

			var genLabel = function(state, parent, name, count) {
				var color = state._chartDimensionColor(name);

				var user_element = null;
				var user_id = self.data('show-value-of-' + name + '-at') || null;
				if(user_id !== null) {
					user_element = document.getElementById(user_id) || null;
					if(user_element === null)
						me.log('Cannot find element with id: ' + user_id);
				}

				state.element_legend_childs.series[name] = {
					name: document.createElement('span'),
					value: document.createElement('span'),
					user: user_element,
					last: null
				};

				var label = state.element_legend_childs.series[name];

				// create the dimension visibility tracking for this label
				state.dimensions_visibility.dimensionAdd(name, label.name, label.value, color);

				var rgb = NETDATA.colorHex2Rgb(color);
				label.name.innerHTML = '<table class="netdata-legend-name-table-'
					+ state.chart.chart_type
					+ '" style="background-color: '
					+ 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + NETDATA.options.current['color_fill_opacity_' + state.chart.chart_type] + ')'
					+ '"><tr class="netdata-legend-name-tr"><td class="netdata-legend-name-td"></td></tr></table>'

				var text = document.createTextNode(' ' + name);
				label.name.appendChild(text);

				if(count > 0)
					parent.appendChild(document.createElement('br'));

				parent.appendChild(label.name);
				parent.appendChild(label.value);
			};

			var content = document.createElement('div');

			if(this.hasLegend()) {
				this.element_legend_childs = {
					content: content,
					resize_handler: document.createElement('div'),
					title_date: document.createElement('span'),
					title_time: document.createElement('span'),
					title_units: document.createElement('span'),
					nano: document.createElement('div'),
					nano_options: {
						paneClass: 'netdata-legend-series-pane',
						sliderClass: 'netdata-legend-series-slider',
						contentClass: 'netdata-legend-series-content',
						enabledClass: '__enabled',
						flashedClass: '__flashed',
						activeClass: '__active',
						tabIndex: -1,
						alwaysVisible: true,
						sliderMinHeight: 10
					},
					series: {}
				};

				this.element_legend.innerHTML = '';

				this.element_legend_childs.resize_handler.className += " netdata-legend-resize-handler";
				this.element_legend_childs.resize_handler.innerHTML = '<i class="fa fa-chevron-up"></i><i class="fa fa-chevron-down"></i>';
				this.element.appendChild(this.element_legend_childs.resize_handler);

				// mousedown event
				this.element_legend_childs.resize_handler.onmousedown =
					function(e) {
						that.resizeHandler(e);
					};

				// touchstart event
				this.element_legend_childs.resize_handler.addEventListener('touchstart', function(e) {
					that.resizeHandler(e);
				}, false);

				this.element_legend_childs.title_date.className += " netdata-legend-title-date";
				this.element_legend.appendChild(this.element_legend_childs.title_date);

				this.element_legend.appendChild(document.createElement('br'));

				this.element_legend_childs.title_time.className += " netdata-legend-title-time";
				this.element_legend.appendChild(this.element_legend_childs.title_time);

				this.element_legend.appendChild(document.createElement('br'));

				this.element_legend_childs.title_units.className += " netdata-legend-title-units";
				this.element_legend.appendChild(this.element_legend_childs.title_units);

				this.element_legend.appendChild(document.createElement('br'));

				this.element_legend_childs.nano.className = 'netdata-legend-series';
				this.element_legend.appendChild(this.element_legend_childs.nano);

				content.className = 'netdata-legend-series-content';
				this.element_legend_childs.nano.appendChild(content);
			}
			else {
				this.element_legend_childs = {
					content: content,
					resize_handler: null,
					title_date: null,
					title_time: null,
					title_units: null,
					nano: null,
					nano_options: null,
					series: {}
				};
			}

			if(this.data) {
				this.element_legend_childs.series.labels_key = this.data.dimension_names.toString();
				if(this.debug === true)
					this.log('labels from data: "' + this.element_legend_childs.series.labels_key + '"');

				for(var i = 0, len = this.data.dimension_names.length; i < len ;i++) {
					genLabel(this, content, this.data.dimension_names[i], i);
				}
			}
			else {
				var tmp = new Array();
				for(var dim in this.chart.dimensions) {
					tmp.push(this.chart.dimensions[dim].name);
					genLabel(this, content, this.chart.dimensions[dim].name, i);
				}
				this.element_legend_childs.series.labels_key = tmp.toString();
				if(this.debug === true)
					this.log('labels from chart: "' + this.element_legend_childs.series.labels_key + '"');
			}

			// create a hidden div to be used for hidding
			// the original legend of the chart library
			var el = document.createElement('div');
			if(this.element_legend !== null)
				this.element_legend.appendChild(el);
			el.style.display = 'none';

			this.element_legend_childs.hidden = document.createElement('div');
			el.appendChild(this.element_legend_childs.hidden);

			if(this.element_legend_childs.nano !== null && this.element_legend_childs.nano_options !== null)
				$(this.element_legend_childs.nano).nanoScroller(this.element_legend_childs.nano_options);

			this.legendShowLatestValues();
		}

		this.hasLegend = function() {
			if(typeof this.___hasLegendCache___ !== 'undefined')
				return this.___hasLegendCache___;

			var leg = false;
			if(this.library && this.library.legend(this) === 'right-side') {
				var legend = $(this.element).data('legend') || 'yes';
				if(legend === 'yes') leg = true;
			}

			this.___hasLegendCache___ = leg;
			return leg;
		}

		this.legendWidth = function() {
			return (this.hasLegend())?140:0;
		}

		this.legendHeight = function() {
			return $(this.element).height();
		}

		this.chartWidth = function() {
			return $(this.element).width() - this.legendWidth();
		}

		this.chartHeight = function() {
			return $(this.element).height();
		}

		this.chartPixelsPerPoint = function() {
			// force an options provided detail
			var px = this.pixels_per_point;

			if(this.library && px < this.library.pixels_per_point(this))
				px = this.library.pixels_per_point(this);

			if(px < NETDATA.options.current.pixels_per_point)
				px = NETDATA.options.current.pixels_per_point;

			return px;
		}

		this.needsRecreation = function() {
			return (
					this.chart_created === true
					&& this.library
					&& this.library.autoresize() === false
					&& this.tm.last_resized < NETDATA.options.last_resized
				);
		}

		this.chartURL = function() {
			var after, before, points_multiplier = 1;
			if(NETDATA.globalPanAndZoom.isActive() && NETDATA.globalPanAndZoom.isMaster(this) === false) {
				this.tm.pan_and_zoom_seq = NETDATA.globalPanAndZoom.seq;

				after = Math.round(NETDATA.globalPanAndZoom.force_after_ms / 1000);
				before = Math.round(NETDATA.globalPanAndZoom.force_before_ms / 1000);
				this.view_after = after * 1000;
				this.view_before = before * 1000;

				this.requested_padding = null;
				points_multiplier = 1;
			}
			else if(this.current.force_before_ms !== null && this.current.force_after_ms !== null) {
				this.tm.pan_and_zoom_seq = 0;

				before = Math.round(this.current.force_before_ms / 1000);
				after  = Math.round(this.current.force_after_ms / 1000);
				this.view_after = after * 1000;
				this.view_before = before * 1000;

				if(NETDATA.options.current.pan_and_zoom_data_padding === true) {
					this.requested_padding = Math.round((before - after) / 2);
					after -= this.requested_padding;
					before += this.requested_padding;
					this.requested_padding *= 1000;
					points_multiplier = 2;
				}

				this.current.force_before_ms = null;
				this.current.force_after_ms = null;
			}
			else {
				this.tm.pan_and_zoom_seq = 0;

				before = this.before;
				after  = this.after;
				this.view_after = after * 1000;
				this.view_before = before * 1000;

				this.requested_padding = null;
				points_multiplier = 1;
			}

			this.requested_after = after * 1000;
			this.requested_before = before * 1000;

			this.data_points = this.points || Math.round(this.chartWidth() / this.chartPixelsPerPoint());

			// build the data URL
			this.data_url = this.host + this.chart.data_url;
			this.data_url += "&format="  + this.library.format();
			this.data_url += "&points="  + (this.data_points * points_multiplier).toString();
			this.data_url += "&group="   + this.method;
			this.data_url += "&options=" + this.library.options(this);
			this.data_url += '|jsonwrap';

			if(NETDATA.options.current.eliminate_zero_dimensions === true)
				this.data_url += '|nonzero';

			if(this.append_options !== null)
				this.data_url += '|' + this.append_options.toString();

			if(after)
				this.data_url += "&after="  + after.toString();

			if(before)
				this.data_url += "&before=" + before.toString();

			if(this.dimensions)
				this.data_url += "&dimensions=" + this.dimensions;

			if(NETDATA.options.debug.chart_data_url === true || this.debug === true)
				this.log('chartURL(): ' + this.data_url + ' WxH:' + this.chartWidth() + 'x' + this.chartHeight() + ' points: ' + this.data_points + ' library: ' + this.library_name);
		}

		this.redrawChart = function() {
			if(this.data !== null)
				this.updateChartWithData(this.data);
		}

		this.updateChartWithData = function(data) {
			if(this.debug === true)
				this.log('updateChartWithData() called.');

			this._updating = false;

			// this may force the chart to be re-created
			resizeChart();

			this.data = data;
			this.updates_counter++;
			this.updates_since_last_unhide++;
			this.updates_since_last_creation++;

			var started = new Date().getTime();

			// if the result is JSON, find the latest update-every
			this.data_update_every = data.view_update_every * 1000;
			this.data_after = data.after * 1000;
			this.data_before = data.before * 1000;
			this.netdata_first = data.first_entry * 1000;
			this.netdata_last = data.last_entry * 1000;
			this.data_points = data.points;
			data.state = this;

			if(NETDATA.options.current.pan_and_zoom_data_padding === true && this.requested_padding !== null) {
				if(this.view_after < this.data_after) {
					// console.log('adusting view_after from ' + this.view_after + ' to ' + this.data_after);
					this.view_after = this.data_after;
				}
				
				if(this.view_before > this.data_before) {
					// console.log('adusting view_before from ' + this.view_before + ' to ' + this.data_before);
					this.view_before = this.data_before;
				}
			}
			else {
				this.view_after = this.data_after;
				this.view_before = this.data_before;
			}

			if(this.debug === true) {
				this.log('UPDATE No ' + this.updates_counter + ' COMPLETED');

				if(this.current.force_after_ms)
					this.log('STATUS: forced    : ' + (this.current.force_after_ms / 1000).toString() + ' - ' + (this.current.force_before_ms / 1000).toString());
				else
					this.log('STATUS: forced    : unset');

				this.log('STATUS: requested : ' + (this.requested_after / 1000).toString() + ' - ' + (this.requested_before / 1000).toString());
				this.log('STATUS: downloaded: ' + (this.data_after / 1000).toString() + ' - ' + (this.data_before / 1000).toString());
				this.log('STATUS: rendered  : ' + (this.view_after / 1000).toString() + ' - ' + (this.view_before / 1000).toString());
				this.log('STATUS: points    : ' + (this.data_points).toString());
			}

			if(this.data_points === 0) {
				noDataToShow();
				return;
			}

			if(this.updates_since_last_creation >= this.library.max_updates_to_recreate()) {
				if(this.debug === true)
					this.log('max updates of ' + this.updates_since_last_creation.toString() + ' reached. Forcing re-generation.');

				this.chart_created = false;
			}

			// check and update the legend
			this.legendUpdateDOM();

			if(this.chart_created === true
				&& typeof this.library.update === 'function') {

				if(this.debug === true)
					this.log('updating chart...');

				if(callChartLibraryUpdateSafely(data) === false)
					return;
			}
			else {
				if(this.debug === true)
					this.log('creating chart...');

				if(callChartLibraryCreateSafely(data) === false)
					return;
			}
			hideMessage();
			this.legendShowLatestValues();
			if(this.selected === true)
				NETDATA.globalSelectionSync.stop();

			// update the performance counters
			var now = new Date().getTime();
			this.tm.last_updated = now;

			// don't update last_autorefreshed if this chart is
			// forced to be updated with global PanAndZoom
			if(NETDATA.globalPanAndZoom.isActive())
				this.tm.last_autorefreshed = 0;
			else {
				if(NETDATA.options.current.parallel_refresher === true && NETDATA.options.current.concurrent_refreshes)
					this.tm.last_autorefreshed = Math.round(now / this.data_update_every) * this.data_update_every;
				else
					this.tm.last_autorefreshed = now;
			}

			this.refresh_dt_ms = now - started;
			NETDATA.options.auto_refresher_fast_weight += this.refresh_dt_ms;

			if(this.refresh_dt_element !== null)
				this.refresh_dt_element.innerHTML = this.refresh_dt_ms.toString();
		}

		this.updateChart = function(callback) {
			if(this.debug === true)
				this.log('updateChart() called.');

			if(this._updating === true) {
				if(this.debug === true)
					this.log('I am already updating...');

				if(typeof callback === 'function') callback();
				return false;
			}

			// due to late initialization of charts and libraries
			// we need to check this too
			if(this.enabled === false) {
				if(this.debug === true)
					this.log('I am not enabled');

				if(typeof callback === 'function') callback();
				return false;
			}

			if(canBeRendered() === false) {
				if(typeof callback === 'function') callback();
				return false;
			}

			if(this.chart === null) {
				this.getChart(function() { that.updateChart(callback); });
				return false;
			}

			if(this.library.initialized === false) {
				if(this.library.enabled === true) {
					this.library.initialize(function() { that.updateChart(callback); });
					return false;
				}
				else {
					error('chart library "' + this.library_name + '" is not available.');
					if(typeof callback === 'function') callback();
					return false;
				}
			}

			this.clearSelection();
			this.chartURL();

			if(this.debug === true)
				this.log('updating from ' + this.data_url);

			this._updating = true;

			this.xhr = $.ajax( {
				url: this.data_url,
				crossDomain: NETDATA.options.crossDomainAjax,
				cache: false,
				async: true
			})
			.success(function(data) {
				if(that.debug === true)
					that.log('data received. updating chart.');

				that.updateChartWithData(data);
			})
			.fail(function() {
				error('data download failed for url: ' + that.data_url);
			})
			.always(function() {
				this._updating = false;
				if(typeof callback === 'function') callback();
			});

			return true;
		}

		this.isVisible = function(nocache) {
			if(typeof nocache === 'undefined')
				nocache = false;

			// this.log('last_visible_check: ' + this.tm.last_visible_check + ', last_page_scroll: ' + NETDATA.options.last_page_scroll);

			// caching - we do not evaluate the charts visibility
			// if the page has not been scrolled since the last check
			if(nocache === false && this.tm.last_visible_check > NETDATA.options.last_page_scroll)
				return this.___isVisible___;

			this.tm.last_visible_check = new Date().getTime();

			var wh = window.innerHeight;
			var x = this.element.getBoundingClientRect();
			var ret = 0;
			var tolerance = 0;

			if(x.width === 0 || x.height === 0) {
				hideChart();
				this.___isVisible___ = false;
				return this.___isVisible___;
			}

			if(x.top < 0 && -x.top > x.height) {
				// the chart is entirely above
				ret = -x.top - x.height;
			}
			else if(x.top > wh) {
				// the chart is entirely below
				ret = x.top - wh;
			}

			if(ret > tolerance) {
				// the chart is too far

				hideChart();
				this.___isVisible___ = false;
				return this.___isVisible___;
			}
			else {
				// the chart is inside or very close

				unhideChart();
				this.___isVisible___ = true;
				return this.___isVisible___;
			}
		}

		this.isAutoRefreshed = function() {
			return (this.current.autorefresh);
		}

		this.canBeAutoRefreshed = function() {
			now = new Date().getTime();

			if(this.enabled === false) {
				if(this.debug === true)
					this.log('I am not enabled');

				return false;
			}

			if(this.library === null || this.library.enabled === false) {
				error('charting library "' + this.library_name + '" is not available');
				if(this.debug === true)
					this.log('My chart library ' + this.library_name + ' is not available');

				return false;
			}

			if(this.isVisible() === false) {
				if(NETDATA.options.debug.visibility === true || this.debug === true)
					this.log('I am not visible');

				return false;
			}

			if(this.current.force_update_at !== 0 && this.current.force_update_at < now) {
				if(this.debug === true)
					this.log('timed force update detected - allowing this update');

				this.current.force_update_at = 0;
				return true;
			}

			if(this.isAutoRefreshed() === true) {
				// allow the first update, even if the page is not visible
				if(this.updates_counter && this.updates_since_last_unhide && NETDATA.options.page_is_visible === false) {
					if(NETDATA.options.debug.focus === true || this.debug === true)
						this.log('canBeAutoRefreshed(): page does not have focus');

					return false;
				}

				if(this.needsRecreation() === true) {
					if(this.debug === true)
						this.log('canBeAutoRefreshed(): needs re-creation.');

					return true;
				}

				// options valid only for autoRefresh()
				if(NETDATA.options.auto_refresher_stop_until === 0 || NETDATA.options.auto_refresher_stop_until < now) {
					if(NETDATA.globalPanAndZoom.isActive()) {
						if(NETDATA.globalPanAndZoom.shouldBeAutoRefreshed(this)) {
							if(this.debug === true)
								this.log('canBeAutoRefreshed(): global panning: I need an update.');

							return true;
						}
						else {
							if(this.debug === true)
								this.log('canBeAutoRefreshed(): global panning: I am already up to date.');

							return false;
						}
					}

					if(this.selected === true) {
						if(this.debug === true)
							this.log('canBeAutoRefreshed(): I have a selection in place.');

						return false;
					}

					if(this.paused === true) {
						if(this.debug === true)
							this.log('canBeAutoRefreshed(): I am paused.');

						return false;
					}

					if(now - this.tm.last_autorefreshed >= this.data_update_every) {
						if(this.debug === true)
							this.log('canBeAutoRefreshed(): It is time to update me.');

						return true;
					}
				}
			}

			return false;
		}

		this.autoRefresh = function(callback) {
			if(this.canBeAutoRefreshed() === true) {
				this.updateChart(callback);
			}
			else {
				if(typeof callback !== 'undefined')
					callback();
			}
		}

		this._defaultsFromDownloadedChart = function(chart) {
			this.chart = chart;
			this.chart_url = chart.url;
			this.data_update_every = chart.update_every * 1000;
			this.data_points = Math.round(this.chartWidth() / this.chartPixelsPerPoint());
			this.tm.last_info_downloaded = new Date().getTime();

			if(this.title === null)
				this.title = chart.title;

			if(this.units === null)
				this.units = chart.units;
		}

		// fetch the chart description from the netdata server
		this.getChart = function(callback) {
			this.chart = NETDATA.chartRegistry.get(this.host, this.id);
			if(this.chart) {
				this._defaultsFromDownloadedChart(this.chart);
				if(typeof callback === 'function') callback();
			}
			else {
				this.chart_url = "/api/v1/chart?chart=" + this.id;

				if(this.debug === true)
					this.log('downloading ' + this.chart_url);

				$.ajax( {
					url:  this.host + this.chart_url,
					crossDomain: NETDATA.options.crossDomainAjax,
					cache: false,
					async: true
				})
				.done(function(chart) {
					chart.url = that.chart_url;
					that._defaultsFromDownloadedChart(chart);
					NETDATA.chartRegistry.add(that.host, that.id, chart);
				})
				.fail(function() {
					NETDATA.error(404, that.chart_url);
					error('chart not found on url "' + that.chart_url + '"');
				})
				.always(function() {
					if(typeof callback === 'function') callback();
				});
			}
		}

		// ============================================================================================================
		// INITIALIZATION

		init();
	}

	NETDATA.resetAllCharts = function(state) {
		// first clear the global selection sync
		// to make sure no chart is in selected state
		state.globalSelectionSyncStop();

		// there are 2 possibilities here
		// a. state is the global Pan and Zoom master
		// b. state is not the global Pan and Zoom master
		var master = true;
		if(NETDATA.globalPanAndZoom.isMaster(state) === false)
			master = false;

		// clear the global Pan and Zoom
		// this will also refresh the master
		// and unblock any charts currently mirroring the master
		NETDATA.globalPanAndZoom.clearMaster();

		// if we were not the master, reset our status too
		// this is required because most probably the mouse
		// is over this chart, blocking it from autorefreshing
		if(master === false && (state.paused === true || state.selected === true))
			state.resetChart();
	}

	// get or create a chart state, given a DOM element
	NETDATA.chartState = function(element) {
		var state = $(element).data('netdata-state-object') || null;
		if(state === null) {
			state = new chartState(element);
			$(element).data('netdata-state-object', state);
		}
		return state;
	}

	// ----------------------------------------------------------------------------------------------------------------
	// Library functions

	// Load a script without jquery
	// This is used to load jquery - after it is loaded, we use jquery
	NETDATA._loadjQuery = function(callback) {
		if(typeof jQuery === 'undefined') {
			if(NETDATA.options.debug.main_loop === true)
				console.log('loading ' + NETDATA.jQuery);

			var script = document.createElement('script');
			script.type = 'text/javascript';
			script.async = true;
			script.src = NETDATA.jQuery;

			// script.onabort = onError;
			script.onerror = function(err, t) { NETDATA.error(101, NETDATA.jQuery); };
			if(typeof callback === "function")
				script.onload = callback;

			var s = document.getElementsByTagName('script')[0];
			s.parentNode.insertBefore(script, s);
		}
		else if(typeof callback === "function")
			callback();
	}

	NETDATA._loadCSS = function(filename) {
		// don't use jQuery here
		// styles are loaded before jQuery
		// to eliminate showing an unstyled page to the user

		var fileref = document.createElement("link");
		fileref.setAttribute("rel", "stylesheet");
		fileref.setAttribute("type", "text/css");
		fileref.setAttribute("href", filename);

		if (typeof fileref !== 'undefined')
			document.getElementsByTagName("head")[0].appendChild(fileref);
	}

	NETDATA.colorHex2Rgb = function(hex) {
		// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
		var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
			hex = hex.replace(shorthandRegex, function(m, r, g, b) {
			return r + r + g + g + b + b;
		});

		var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
		return result ? {
			r: parseInt(result[1], 16),
			g: parseInt(result[2], 16),
			b: parseInt(result[3], 16)
		} : null;
	}

	NETDATA.colorLuminance = function(hex, lum) {
		// validate hex string
		hex = String(hex).replace(/[^0-9a-f]/gi, '');
		if (hex.length < 6)
			hex = hex[0]+hex[0]+hex[1]+hex[1]+hex[2]+hex[2];

		lum = lum || 0;

		// convert to decimal and change luminosity
		var rgb = "#", c, i;
		for (i = 0; i < 3; i++) {
			c = parseInt(hex.substr(i*2,2), 16);
			c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16);
			rgb += ("00"+c).substr(c.length);
		}

		return rgb;
	}

	NETDATA.guid = function() {
		function s4() {
			return Math.floor((1 + Math.random()) * 0x10000)
					.toString(16)
					.substring(1);
			}

			return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
	}

	NETDATA.zeropad = function(x) {
		if(x > -10 && x < 10) return '0' + x.toString();
		else return x.toString();
	}

	// user function to signal us the DOM has been
	// updated.
	NETDATA.updatedDom = function() {
		NETDATA.options.updated_dom = true;
	}

	NETDATA.ready = function(callback) {
		NETDATA.options.pauseCallback = callback;
	}

	NETDATA.pause = function(callback) {
		if(NETDATA.options.pause === true)
			callback();
		else
			NETDATA.options.pauseCallback = callback;
	}

	NETDATA.unpause = function() {
		NETDATA.options.pauseCallback = null;
		NETDATA.options.updated_dom = true;
		NETDATA.options.pause = false;
	}

	// ----------------------------------------------------------------------------------------------------------------

	// this is purely sequencial charts refresher
	// it is meant to be autonomous
	NETDATA.chartRefresherNoParallel = function(index) {
		if(NETDATA.options.debug.mail_loop === true)
			console.log('NETDATA.chartRefresherNoParallel(' + index + ')');

		if(NETDATA.options.updated_dom === true) {
			// the dom has been updated
			// get the dom parts again
			NETDATA.parseDom(NETDATA.chartRefresher);
			return;
		}
		if(index >= NETDATA.options.targets.length) {
			if(NETDATA.options.debug.main_loop === true)
				console.log('waiting to restart main loop...');

			NETDATA.options.auto_refresher_fast_weight = 0;

			setTimeout(function() {
				NETDATA.chartRefresher();
			}, NETDATA.options.current.idle_between_loops);
		}
		else {
			var state = NETDATA.options.targets[index];

			if(NETDATA.options.auto_refresher_fast_weight < NETDATA.options.current.fast_render_timeframe) {
				if(NETDATA.options.debug.main_loop === true)
					console.log('fast rendering...');

				state.autoRefresh(function() {
					NETDATA.chartRefresherNoParallel(++index);
				});
			}
			else {
				if(NETDATA.options.debug.main_loop === true) console.log('waiting for next refresh...');
				NETDATA.options.auto_refresher_fast_weight = 0;

				setTimeout(function() {
					state.autoRefresh(function() {
						NETDATA.chartRefresherNoParallel(++index);
					});
				}, NETDATA.options.current.idle_between_charts);
			}
		}
	}

	// this is part of the parallel refresher
	// its cause is to refresh sequencially all the charts
	// that depend on chart library initialization
	// it will call the parallel refresher back
	// as soon as it sees a chart that its chart library
	// is initialized
	NETDATA.chartRefresher_unitialized = function() {
		if(NETDATA.options.updated_dom === true) {
			// the dom has been updated
			// get the dom parts again
			NETDATA.parseDom(NETDATA.chartRefresher);
			return;
		}

		if(NETDATA.options.sequencial.length === 0)
			NETDATA.chartRefresher();
		else {
			var state = NETDATA.options.sequencial.pop();
			if(state.library.initialized === true)
				NETDATA.chartRefresher();
			else
				state.autoRefresh(NETDATA.chartRefresher_unitialized);
		}
	}

	NETDATA.chartRefresherWaitTime = function() {
		return NETDATA.options.current.idle_parallel_loops;
	}

	// the default refresher
	// it will create 2 sets of charts:
	// - the ones that can be refreshed in parallel
	// - the ones that depend on something else
	// the first set will be executed in parallel
	// the second will be given to NETDATA.chartRefresher_unitialized()
	NETDATA.chartRefresher = function() {
		if(NETDATA.options.pause === true) {
			// console.log('auto-refresher is paused');
			setTimeout(NETDATA.chartRefresher,
				NETDATA.chartRefresherWaitTime());
			return;
		}

		if(typeof NETDATA.options.pauseCallback === 'function') {
			// console.log('auto-refresher is calling pauseCallback');
			NETDATA.options.pause = true;
			NETDATA.options.pauseCallback();
			NETDATA.chartRefresher();
			return;
		}

		if(NETDATA.options.current.parallel_refresher === false) {
			NETDATA.chartRefresherNoParallel(0);
			return;
		}

		if(NETDATA.options.updated_dom === true) {
			// the dom has been updated
			// get the dom parts again
			NETDATA.parseDom(NETDATA.chartRefresher);
			return;
		}

		var parallel = new Array();
		var targets = NETDATA.options.targets;
		var len = targets.length;
		while(len--) {
			if(targets[len].isVisible() === false)
				continue;

			var state = targets[len];
			if(state.library.initialized === false) {
				if(state.library.enabled === true) {
					state.library.initialize(NETDATA.chartRefresher);
					return;
				}
				else {
					state.error('chart library "' + state.library_name + '" is not enabled.');
				}
			}

			parallel.unshift(state);
		}

		if(parallel.length > 0) {
			var parallel_jobs = parallel.length;

			// this will execute the jobs in parallel
			$(parallel).each(function() {
				this.autoRefresh(function() {
					parallel_jobs--;

					if(parallel_jobs === 0) {
						setTimeout(NETDATA.chartRefresher,
							NETDATA.chartRefresherWaitTime());
					}
				});
			})
		}
		else {
			setTimeout(NETDATA.chartRefresher,
				NETDATA.chartRefresherWaitTime());
		}
	}

	NETDATA.parseDom = function(callback) {
		NETDATA.options.last_page_scroll = new Date().getTime();
		NETDATA.options.updated_dom = false;

		var targets = $('div[data-netdata]'); //.filter(':visible');

		if(NETDATA.options.debug.main_loop === true)
			console.log('DOM updated - there are ' + targets.length + ' charts on page.');

		NETDATA.options.targets = new Array();
		var len = targets.length;
		while(len--) {
			// the initialization will take care of sizing
			// and the "loading..." message
			NETDATA.options.targets.push(NETDATA.chartState(targets[len]));
		}

		if(typeof callback === 'function') callback();
	}

	// this is the main function - where everything starts
	NETDATA.start = function() {
		// this should be called only once

		NETDATA.options.page_is_visible = true;

		$(window).blur(function() {
			if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
				NETDATA.options.page_is_visible = false;
				if(NETDATA.options.debug.focus === true)
					console.log('Lost Focus!');
			}
		});

		$(window).focus(function() {
			if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
				NETDATA.options.page_is_visible = true;
				if(NETDATA.options.debug.focus === true)
					console.log('Focus restored!');
			}
		});

		if(typeof document.hasFocus === 'function' && !document.hasFocus()) {
			if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
				NETDATA.options.page_is_visible = false;
				if(NETDATA.options.debug.focus === true)
					console.log('Document has no focus!');
			}
		}

		// bootstrap tab switching
		$('a[data-toggle="tab"]').on('shown.bs.tab', NETDATA.onscroll);

		// bootstrap modal switching
		$('.modal').on('hidden.bs.modal', NETDATA.onscroll);
		$('.modal').on('shown.bs.modal', NETDATA.onscroll);
		
		NETDATA.parseDom(NETDATA.chartRefresher);
	}

	// ----------------------------------------------------------------------------------------------------------------
	// peity

	NETDATA.peityInitialize = function(callback) {
		if(typeof netdataNoPeitys === 'undefined' || !netdataNoPeitys) {
			$.ajax({
				url: NETDATA.peity_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('peity', NETDATA.peity_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.peity.enabled = false;
				NETDATA.error(100, NETDATA.peity_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.peity.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.peityChartUpdate = function(state, data) {
		state.peity_instance.innerHTML = data.result;

		if(state.peity_options.stroke !== state.chartColors()[0]) {
			state.peity_options.stroke = state.chartColors()[0];
			if(state.chart.chart_type === 'line')
				state.peity_options.fill = NETDATA.themes.current.background;
			else
				state.peity_options.fill = NETDATA.colorLuminance(state.chartColors()[0], NETDATA.chartDefaults.fill_luminance);
		}

		$(state.peity_instance).peity('line', state.peity_options);
		return true;
	}

	NETDATA.peityChartCreate = function(state, data) {
		state.peity_instance = document.createElement('div');
		state.element_chart.appendChild(state.peity_instance);

		var self = $(state.element);
		state.peity_options = {
			stroke: NETDATA.themes.current.foreground,
			strokeWidth: self.data('peity-strokewidth') || 1,
			width: state.chartWidth(),
			height: state.chartHeight(),
			fill: NETDATA.themes.current.foreground
		};

		NETDATA.peityChartUpdate(state, data);
		return true;
	}

	// ----------------------------------------------------------------------------------------------------------------
	// sparkline

	NETDATA.sparklineInitialize = function(callback) {
		if(typeof netdataNoSparklines === 'undefined' || !netdataNoSparklines) {
			$.ajax({
				url: NETDATA.sparkline_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('sparkline', NETDATA.sparkline_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.sparkline.enabled = false;
				NETDATA.error(100, NETDATA.sparkline_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.sparkline.enabled = false;
			if(typeof callback === "function") 
				callback();
		}
	};

	NETDATA.sparklineChartUpdate = function(state, data) {
		state.sparkline_options.width = state.chartWidth();
		state.sparkline_options.height = state.chartHeight();

		$(state.element_chart).sparkline(data.result, state.sparkline_options);
		return true;
	}

	NETDATA.sparklineChartCreate = function(state, data) {
		var self = $(state.element);
		var type = self.data('sparkline-type') || 'line';
		var lineColor = self.data('sparkline-linecolor') || state.chartColors()[0];
		var fillColor = self.data('sparkline-fillcolor') || (state.chart.chart_type === 'line')?NETDATA.themes.current.background:NETDATA.colorLuminance(lineColor, NETDATA.chartDefaults.fill_luminance);
		var chartRangeMin = self.data('sparkline-chartrangemin') || undefined;
		var chartRangeMax = self.data('sparkline-chartrangemax') || undefined;
		var composite = self.data('sparkline-composite') || undefined;
		var enableTagOptions = self.data('sparkline-enabletagoptions') || undefined;
		var tagOptionPrefix = self.data('sparkline-tagoptionprefix') || undefined;
		var tagValuesAttribute = self.data('sparkline-tagvaluesattribute') || undefined;
		var disableHiddenCheck = self.data('sparkline-disablehiddencheck') || undefined;
		var defaultPixelsPerValue = self.data('sparkline-defaultpixelspervalue') || undefined;
		var spotColor = self.data('sparkline-spotcolor') || undefined;
		var minSpotColor = self.data('sparkline-minspotcolor') || undefined;
		var maxSpotColor = self.data('sparkline-maxspotcolor') || undefined;
		var spotRadius = self.data('sparkline-spotradius') || undefined;
		var valueSpots = self.data('sparkline-valuespots') || undefined;
		var highlightSpotColor = self.data('sparkline-highlightspotcolor') || undefined;
		var highlightLineColor = self.data('sparkline-highlightlinecolor') || undefined;
		var lineWidth = self.data('sparkline-linewidth') || undefined;
		var normalRangeMin = self.data('sparkline-normalrangemin') || undefined;
		var normalRangeMax = self.data('sparkline-normalrangemax') || undefined;
		var drawNormalOnTop = self.data('sparkline-drawnormalontop') || undefined;
		var xvalues = self.data('sparkline-xvalues') || undefined;
		var chartRangeClip = self.data('sparkline-chartrangeclip') || undefined;
		var xvalues = self.data('sparkline-xvalues') || undefined;
		var chartRangeMinX = self.data('sparkline-chartrangeminx') || undefined;
		var chartRangeMaxX = self.data('sparkline-chartrangemaxx') || undefined;
		var disableInteraction = self.data('sparkline-disableinteraction') || false;
		var disableTooltips = self.data('sparkline-disabletooltips') || false;
		var disableHighlight = self.data('sparkline-disablehighlight') || false;
		var highlightLighten = self.data('sparkline-highlightlighten') || 1.4;
		var highlightColor = self.data('sparkline-highlightcolor') || undefined;
		var tooltipContainer = self.data('sparkline-tooltipcontainer') || undefined;
		var tooltipClassname = self.data('sparkline-tooltipclassname') || undefined;
		var tooltipFormat = self.data('sparkline-tooltipformat') || undefined;
		var tooltipPrefix = self.data('sparkline-tooltipprefix') || undefined;
		var tooltipSuffix = self.data('sparkline-tooltipsuffix') || ' ' + state.units;
		var tooltipSkipNull = self.data('sparkline-tooltipskipnull') || true;
		var tooltipValueLookups = self.data('sparkline-tooltipvaluelookups') || undefined;
		var tooltipFormatFieldlist = self.data('sparkline-tooltipformatfieldlist') || undefined;
		var tooltipFormatFieldlistKey = self.data('sparkline-tooltipformatfieldlistkey') || undefined;
		var numberFormatter = self.data('sparkline-numberformatter') || function(n){ return n.toFixed(2); };
		var numberDigitGroupSep = self.data('sparkline-numberdigitgroupsep') || undefined;
		var numberDecimalMark = self.data('sparkline-numberdecimalmark') || undefined;
		var numberDigitGroupCount = self.data('sparkline-numberdigitgroupcount') || undefined;
		var animatedZooms = self.data('sparkline-animatedzooms') || false;

		state.sparkline_options = {
			type: type,
			lineColor: lineColor,
			fillColor: fillColor,
			chartRangeMin: chartRangeMin,
			chartRangeMax: chartRangeMax,
			composite: composite,
			enableTagOptions: enableTagOptions,
			tagOptionPrefix: tagOptionPrefix,
			tagValuesAttribute: tagValuesAttribute,
			disableHiddenCheck: disableHiddenCheck,
			defaultPixelsPerValue: defaultPixelsPerValue,
			spotColor: spotColor,
			minSpotColor: minSpotColor,
			maxSpotColor: maxSpotColor,
			spotRadius: spotRadius,
			valueSpots: valueSpots,
			highlightSpotColor: highlightSpotColor,
			highlightLineColor: highlightLineColor,
			lineWidth: lineWidth,
			normalRangeMin: normalRangeMin,
			normalRangeMax: normalRangeMax,
			drawNormalOnTop: drawNormalOnTop,
			xvalues: xvalues,
			chartRangeClip: chartRangeClip,
			chartRangeMinX: chartRangeMinX,
			chartRangeMaxX: chartRangeMaxX,
			disableInteraction: disableInteraction,
			disableTooltips: disableTooltips,
			disableHighlight: disableHighlight,
			highlightLighten: highlightLighten,
			highlightColor: highlightColor,
			tooltipContainer: tooltipContainer,
			tooltipClassname: tooltipClassname,
			tooltipChartTitle: state.title,
			tooltipFormat: tooltipFormat,
			tooltipPrefix: tooltipPrefix,
			tooltipSuffix: tooltipSuffix,
			tooltipSkipNull: tooltipSkipNull,
			tooltipValueLookups: tooltipValueLookups,
			tooltipFormatFieldlist: tooltipFormatFieldlist,
			tooltipFormatFieldlistKey: tooltipFormatFieldlistKey,
			numberFormatter: numberFormatter,
			numberDigitGroupSep: numberDigitGroupSep,
			numberDecimalMark: numberDecimalMark,
			numberDigitGroupCount: numberDigitGroupCount,
			animatedZooms: animatedZooms,
			width: state.chartWidth(),
			height: state.chartHeight()
		};

		$(state.element_chart).sparkline(data.result, state.sparkline_options);
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// dygraph

	NETDATA.dygraph = {
		smooth: false
	};

	NETDATA.dygraphSetSelection = function(state, t) {
		if(typeof state.dygraph_instance !== 'undefined') {
			var r = state.calculateRowForTime(t);
			if(r !== -1)
				state.dygraph_instance.setSelection(r);
			else {
				state.dygraph_instance.clearSelection();
				state.legendShowUndefined();
			}
		}

		return true;
	};

	NETDATA.dygraphClearSelection = function(state, t) {
		if(typeof state.dygraph_instance !== 'undefined') {
			state.dygraph_instance.clearSelection();
		}
		return true;
	};

	NETDATA.dygraphSmoothInitialize = function(callback) {
		$.ajax({
			url: NETDATA.dygraph_smooth_js,
			cache: true,
			dataType: "script"
		})
		.done(function() {
			NETDATA.dygraph.smooth = true;
			smoothPlotter.smoothing = 0.3;
		})
		.fail(function() {
			NETDATA.dygraph.smooth = false;
		})
		.always(function() {
			if(typeof callback === "function")
				callback();
		});
	}

	NETDATA.dygraphInitialize = function(callback) {
		if(typeof netdataNoDygraphs === 'undefined' || !netdataNoDygraphs) {
			$.ajax({
				url: NETDATA.dygraph_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('dygraph', NETDATA.dygraph_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.dygraph.enabled = false;
				NETDATA.error(100, NETDATA.dygraph_js);
			})
			.always(function() {
				if(NETDATA.chartLibraries.dygraph.enabled === true && NETDATA.options.current.smooth_plot === true)
					NETDATA.dygraphSmoothInitialize(callback);
				else if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.dygraph.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.dygraphChartUpdate = function(state, data) {
		var dygraph = state.dygraph_instance;

		if(typeof dygraph === 'undefined')
			return NETDATA.dygraphChartCreate(state, data);

		// when the chart is not visible, and hidden
		// if there is a window resize, dygraph detects
		// its element size as 0x0.
		// this will make it re-appear properly

		if(state.tm.last_unhidden > state.dygraph_last_rendered)
			dygraph.resize();

		var options = {
				file: data.result.data,
				colors: state.chartColors(),
				labels: data.result.labels,
				labelsDivWidth: state.chartWidth() - 70,
				visibility: state.dimensions_visibility.selected2BooleanArray(state.data.dimension_names)
		};

		if(state.dygraph_force_zoom === true) {
			if(NETDATA.options.debug.dygraph === true || state.debug === true)
				state.log('dygraphChartUpdate() forced zoom update');

			options.dateWindow = (state.requested_padding !== null)?[ state.view_after, state.view_before ]:null;
			options.valueRange = null;
			options.isZoomedIgnoreProgrammaticZoom = true;
			state.dygraph_force_zoom = false;
		}
		else if(state.current.name !== 'auto') {
			if(NETDATA.options.debug.dygraph === true || state.debug === true)
				state.log('dygraphChartUpdate() loose update');
		}
		else {
			if(NETDATA.options.debug.dygraph === true || state.debug === true)
				state.log('dygraphChartUpdate() strict update');

			options.dateWindow = (state.requested_padding !== null)?[ state.view_after, state.view_before ]:null;
			options.valueRange = null;
			options.isZoomedIgnoreProgrammaticZoom = true;
		}

		if(state.dygraph_smooth_eligible === true) {
			if((NETDATA.options.current.smooth_plot === true && state.dygraph_options.plotter !== smoothPlotter)
				|| (NETDATA.options.current.smooth_plot === false && state.dygraph_options.plotter === smoothPlotter)) {
				NETDATA.dygraphChartCreate(state, data);
				return;
			}
		}

		dygraph.updateOptions(options);

		state.dygraph_last_rendered = new Date().getTime();
		return true;
	};

	NETDATA.dygraphChartCreate = function(state, data) {
		if(NETDATA.options.debug.dygraph === true || state.debug === true)
			state.log('dygraphChartCreate()');

		var self = $(state.element);

		var chart_type = state.chart.chart_type;
		if(chart_type === 'stacked' && data.dimensions === 1) chart_type = 'area';
		chart_type = self.data('dygraph-type') || chart_type;

		var smooth = (chart_type === 'line' && !NETDATA.chartLibraries.dygraph.isSparkline(state))?true:false;
		smooth = self.data('dygraph-smooth') || smooth;

		if(NETDATA.dygraph.smooth === false)
			smooth = false;

		var strokeWidth = (chart_type === 'stacked')?0.1:((smooth)?1.5:0.7)
		var highlightCircleSize = (NETDATA.chartLibraries.dygraph.isSparkline(state))?3:4;

		state.dygraph_options = {
			colors: self.data('dygraph-colors') || state.chartColors(),

			// leave a few pixels empty on the right of the chart
			rightGap: self.data('dygraph-rightgap') || 5,
			showRangeSelector: self.data('dygraph-showrangeselector') || false,
			showRoller: self.data('dygraph-showroller') || false,

			title: self.data('dygraph-title') || state.title,
			titleHeight: self.data('dygraph-titleheight') || 19,

			legend: self.data('dygraph-legend') || 'always', // 'onmouseover',
			labels: data.result.labels,
			labelsDiv: self.data('dygraph-labelsdiv') || state.element_legend_childs.hidden,
			labelsDivStyles: self.data('dygraph-labelsdivstyles') || { 'fontSize':'1px' },
			labelsDivWidth: self.data('dygraph-labelsdivwidth') || state.chartWidth() - 70,
			labelsSeparateLines: self.data('dygraph-labelsseparatelines') || true,
			labelsShowZeroValues: self.data('dygraph-labelsshowzerovalues') || true,
			labelsKMB: false,
			labelsKMG2: false,
			showLabelsOnHighlight: self.data('dygraph-showlabelsonhighlight') || true,
			hideOverlayOnMouseOut: self.data('dygraph-hideoverlayonmouseout') || true,

			ylabel: state.units,
			yLabelWidth: self.data('dygraph-ylabelwidth') || 12,

			// the function to plot the chart
			plotter: null,

			// The width of the lines connecting data points. This can be used to increase the contrast or some graphs.
			strokeWidth: self.data('dygraph-strokewidth') || strokeWidth,
			strokePattern: self.data('dygraph-strokepattern') || undefined,

			// The size of the dot to draw on each point in pixels (see drawPoints). A dot is always drawn when a point is "isolated",
			// i.e. there is a missing point on either side of it. This also controls the size of those dots.
			drawPoints: self.data('dygraph-drawpoints') || false,

			// Draw points at the edges of gaps in the data. This improves visibility of small data segments or other data irregularities.
			drawGapEdgePoints: self.data('dygraph-drawgapedgepoints') || true,

			connectSeparatedPoints: self.data('dygraph-connectseparatedpoints') || false,
			pointSize: self.data('dygraph-pointsize') || 1,

			// enabling this makes the chart with little square lines
			stepPlot: self.data('dygraph-stepplot') || false,

			// Draw a border around graph lines to make crossing lines more easily distinguishable. Useful for graphs with many lines.
			strokeBorderColor: self.data('dygraph-strokebordercolor') || NETDATA.themes.current.background,
			strokeBorderWidth: self.data('dygraph-strokeborderwidth') || (chart_type === 'stacked')?0.0:0.0,

			fillGraph: self.data('dygraph-fillgraph') || (chart_type === 'area' || chart_type === 'stacked')?true:false,
			fillAlpha: self.data('dygraph-fillalpha') || (chart_type === 'stacked')?NETDATA.options.current.color_fill_opacity_stacked:NETDATA.options.current.color_fill_opacity_area,
			stackedGraph: self.data('dygraph-stackedgraph') || (chart_type === 'stacked')?true:false,
			stackedGraphNaNFill: self.data('dygraph-stackedgraphnanfill') || 'none',

			drawAxis: self.data('dygraph-drawaxis') || true,
			axisLabelFontSize: self.data('dygraph-axislabelfontsize') || 10,
			axisLineColor: self.data('dygraph-axislinecolor') || NETDATA.themes.current.axis,
			axisLineWidth: self.data('dygraph-axislinewidth') || 0.3,

			drawGrid: self.data('dygraph-drawgrid') || true,
			drawXGrid: self.data('dygraph-drawxgrid') || undefined,
			drawYGrid: self.data('dygraph-drawygrid') || undefined,
			gridLinePattern: self.data('dygraph-gridlinepattern') || null,
			gridLineWidth: self.data('dygraph-gridlinewidth') || 0.3,
			gridLineColor: self.data('dygraph-gridlinecolor') || NETDATA.themes.current.grid,

			maxNumberWidth: self.data('dygraph-maxnumberwidth') || 8,
			sigFigs: self.data('dygraph-sigfigs') || null,
			digitsAfterDecimal: self.data('dygraph-digitsafterdecimal') || 2,
			valueFormatter: self.data('dygraph-valueformatter') || function(x){ return x.toFixed(2); },

			highlightCircleSize: self.data('dygraph-highlightcirclesize') || highlightCircleSize,
			highlightSeriesOpts: self.data('dygraph-highlightseriesopts') || null, // TOO SLOW: { strokeWidth: 1.5 },
			highlightSeriesBackgroundAlpha: self.data('dygraph-highlightseriesbackgroundalpha') || null, // TOO SLOW: (chart_type === 'stacked')?0.7:0.5,

			pointClickCallback: self.data('dygraph-pointclickcallback') || undefined,
			visibility: state.dimensions_visibility.selected2BooleanArray(state.data.dimension_names),
			axes: {
				x: {
					pixelsPerLabel: 50,
					ticker: Dygraph.dateTicker,
					axisLabelFormatter: function (d, gran) {
						return NETDATA.zeropad(d.getHours()) + ":" + NETDATA.zeropad(d.getMinutes()) + ":" + NETDATA.zeropad(d.getSeconds());
					},
					valueFormatter: function (ms) {
						var d = new Date(ms);
						return d.toLocaleDateString() + ' ' + d.toLocaleTimeString();
						// return NETDATA.zeropad(d.getHours()) + ":" + NETDATA.zeropad(d.getMinutes()) + ":" + NETDATA.zeropad(d.getSeconds());
					}
				},
				y: {
					pixelsPerLabel: 15,
					valueFormatter: function (x) {
						// we format legends with the state object
						// no need to do anything here
						// return (Math.round(x*100) / 100).toLocaleString();
						// return state.legendFormatValue(x);
						return x;
					}
				}
			},
			legendFormatter: function(data) {
				var elements = state.element_legend_childs;

				// if the hidden div is not there
				// we are not managing the legend
				if(elements.hidden === null) return;

				if (typeof data.x !== 'undefined') {
					state.legendSetDate(data.x);
					var i = data.series.length;
					while(i--) {
						var series = data.series[i];
						if(!series.isVisible) continue;
						state.legendSetLabelValue(series.label, series.y);
					}
				}

				return '';
			},
			drawCallback: function(dygraph, is_initial) {
				if(state.current.name !== 'auto' && state.dygraph_user_action === true) {
					state.dygraph_user_action = false;

					var x_range = dygraph.xAxisRange();
					var after = Math.round(x_range[0]);
					var before = Math.round(x_range[1]);

					if(NETDATA.options.debug.dygraph === true)
						state.log('dygraphDrawCallback(dygraph, ' + is_initial + '): ' + (after / 1000).toString() + ' - ' + (before / 1000).toString());

					if(before <= state.netdata_last && after >= state.netdata_first)
						state.updateChartPanOrZoom(after, before);
				}
			},
			zoomCallback: function(minDate, maxDate, yRanges) {
				if(NETDATA.options.debug.dygraph === true)
					state.log('dygraphZoomCallback()');

				state.globalSelectionSyncStop();
				state.globalSelectionSyncDelay();
				state.setMode('zoom');

				// refresh it to the greatest possible zoom level
				state.dygraph_user_action = true;
				state.dygraph_force_zoom = true;
				state.updateChartPanOrZoom(minDate, maxDate);
			},
			highlightCallback: function(event, x, points, row, seriesName) {
				if(NETDATA.options.debug.dygraph === true || state.debug === true)
					state.log('dygraphHighlightCallback()');

				state.pauseChart();

				// there is a bug in dygraph when the chart is zoomed enough
				// the time it thinks is selected is wrong
				// here we calculate the time t based on the row number selected
				// which is ok
				var t = state.data_after + row * state.data_update_every;
				// console.log('row = ' + row + ', x = ' + x + ', t = ' + t + ' ' + ((t === x)?'SAME':(Math.abs(x-t)<=state.data_update_every)?'SIMILAR':'DIFFERENT') + ', rows in db: ' + state.data_points + ' visible(x) = ' + state.timeIsVisible(x) + ' visible(t) = ' + state.timeIsVisible(t) + ' r(x) = ' + state.calculateRowForTime(x) + ' r(t) = ' + state.calculateRowForTime(t) + ' range: ' + state.data_after + ' - ' + state.data_before + ' real: ' + state.data.after + ' - ' + state.data.before + ' every: ' + state.data_update_every);

				state.globalSelectionSync(x);

				// fix legend zIndex using the internal structures of dygraph legend module
				// this works, but it is a hack!
				// state.dygraph_instance.plugins_[0].plugin.legend_div_.style.zIndex = 10000;
			},
			unhighlightCallback: function(event) {
				if(NETDATA.options.debug.dygraph === true || state.debug === true)
					state.log('dygraphUnhighlightCallback()');

				state.unpauseChart();
				state.globalSelectionSyncStop();
			},
			interactionModel : {
				mousedown: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mousedown()');

					state.dygraph_user_action = true;
					state.globalSelectionSyncStop();

					if(NETDATA.options.debug.dygraph === true)
						state.log('dygraphMouseDown()');

					// Right-click should not initiate a zoom.
					if(event.button && event.button === 2) return;

					context.initializeMouseDown(event, dygraph, context);

					if(event.button && event.button === 1) {
						if (event.altKey || event.shiftKey) {
							state.setMode('pan');
							state.globalSelectionSyncDelay();
							Dygraph.startPan(event, dygraph, context);
						}
						else {
							state.setMode('zoom');
							state.globalSelectionSyncDelay();
							Dygraph.startZoom(event, dygraph, context);
						}
					}
					else {
						if (event.altKey || event.shiftKey) {
							state.setMode('zoom');
							state.globalSelectionSyncDelay();
							Dygraph.startZoom(event, dygraph, context);
						}
						else {
							state.setMode('pan');
							state.globalSelectionSyncDelay();
							Dygraph.startPan(event, dygraph, context);
						}
					}
				},
				mousemove: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mousemove()');

					if(context.isPanning) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncStop();
						state.globalSelectionSyncDelay();
						state.setMode('pan');
						Dygraph.movePan(event, dygraph, context);
					}
					else if(context.isZooming) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncStop();
						state.globalSelectionSyncDelay();
						state.setMode('zoom');
						Dygraph.moveZoom(event, dygraph, context);
					}
				},
				mouseup: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mouseup()');

					if (context.isPanning) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncDelay();
						Dygraph.endPan(event, dygraph, context);
					}
					else if (context.isZooming) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncDelay();
						Dygraph.endZoom(event, dygraph, context);
					}
				},
				click: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.click()');

					event.preventDefault();
				},
				dblclick: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.dblclick()');
					NETDATA.resetAllCharts(state);
				},
				mousewheel: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mousewheel()');

					// Take the offset of a mouse event on the dygraph canvas and
					// convert it to a pair of percentages from the bottom left. 
					// (Not top left, bottom is where the lower value is.)
					function offsetToPercentage(g, offsetX, offsetY) {
						// This is calculating the pixel offset of the leftmost date.
						var xOffset = g.toDomCoords(g.xAxisRange()[0], null)[0];
						var yar0 = g.yAxisRange(0);

						// This is calculating the pixel of the higest value. (Top pixel)
						var yOffset = g.toDomCoords(null, yar0[1])[1];

						// x y w and h are relative to the corner of the drawing area,
						// so that the upper corner of the drawing area is (0, 0).
						var x = offsetX - xOffset;
						var y = offsetY - yOffset;

						// This is computing the rightmost pixel, effectively defining the
						// width.
						var w = g.toDomCoords(g.xAxisRange()[1], null)[0] - xOffset;

						// This is computing the lowest pixel, effectively defining the height.
						var h = g.toDomCoords(null, yar0[0])[1] - yOffset;

						// Percentage from the left.
						var xPct = w === 0 ? 0 : (x / w);
						// Percentage from the top.
						var yPct = h === 0 ? 0 : (y / h);

						// The (1-) part below changes it from "% distance down from the top"
						// to "% distance up from the bottom".
						return [xPct, (1-yPct)];
					}

					// Adjusts [x, y] toward each other by zoomInPercentage%
					// Split it so the left/bottom axis gets xBias/yBias of that change and
					// tight/top gets (1-xBias)/(1-yBias) of that change.
					//
					// If a bias is missing it splits it down the middle.
					function zoomRange(g, zoomInPercentage, xBias, yBias) {
						xBias = xBias || 0.5;
						yBias = yBias || 0.5;

						function adjustAxis(axis, zoomInPercentage, bias) {
							var delta = axis[1] - axis[0];
							var increment = delta * zoomInPercentage;
							var foo = [increment * bias, increment * (1-bias)];

							return [ axis[0] + foo[0], axis[1] - foo[1] ];
						}

						var yAxes = g.yAxisRanges();
						var newYAxes = [];
						for (var i = 0; i < yAxes.length; i++) {
							newYAxes[i] = adjustAxis(yAxes[i], zoomInPercentage, yBias);
						}

						return adjustAxis(g.xAxisRange(), zoomInPercentage, xBias);
					}

					if(event.altKey || event.shiftKey) {
						state.dygraph_user_action = true;

						state.globalSelectionSyncStop();
						state.globalSelectionSyncDelay();

						// http://dygraphs.com/gallery/interaction-api.js
						var normal = (event.detail) ? event.detail * -1 : event.wheelDelta / 40;
						var percentage = normal / 50;

						if (!(event.offsetX && event.offsetY)){
							event.offsetX = event.layerX - event.target.offsetLeft;
							event.offsetY = event.layerY - event.target.offsetTop;
						}

						var percentages = offsetToPercentage(dygraph, event.offsetX, event.offsetY);
						var xPct = percentages[0];
						var yPct = percentages[1];

						var new_x_range = zoomRange(dygraph, percentage, xPct, yPct);

						var after = new_x_range[0];
						var before = new_x_range[1];

						var first = state.netdata_first + state.data_update_every;
						var last = state.netdata_last + state.data_update_every;

						if(before > last) {
							after -= (before - last);
							before = last;
						}
						if(after < first) {
							after = first;
						}

						state.setMode('zoom');
						if(state.updateChartPanOrZoom(after, before) === true)
							dygraph.updateOptions({ dateWindow: [ after, before ] });

						event.preventDefault();
					}
				},
				touchstart: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.touchstart()');

					state.dygraph_user_action = true;
					state.setMode('zoom');
					state.pauseChart();

					Dygraph.defaultInteractionModel.touchstart(event, dygraph, context);

					// we overwrite the touch directions at the end, to overwrite
					// the internal default of dygraphs
					context.touchDirections = { x: true, y: false };

					state.dygraph_last_touch_start = new Date().getTime();
					state.dygraph_last_touch_move = 0;

					if(typeof event.touches[0].pageX === 'number')
						state.dygraph_last_touch_page_x = event.touches[0].pageX;
					else
						state.dygraph_last_touch_page_x = 0;
				},
				touchmove: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.touchmove()');

					state.dygraph_user_action = true;
					Dygraph.defaultInteractionModel.touchmove(event, dygraph, context);

					state.dygraph_last_touch_move = new Date().getTime();
				},
				touchend: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.touchend()');

					state.dygraph_user_action = true;
					Dygraph.defaultInteractionModel.touchend(event, dygraph, context);

					// if it didn't move, it is a selection
					if(state.dygraph_last_touch_move === 0 && state.dygraph_last_touch_page_x !== 0) {
						// internal api of dygraphs
						var pct = (state.dygraph_last_touch_page_x - (dygraph.plotter_.area.x + state.element.getBoundingClientRect().left)) / dygraph.plotter_.area.w;
						var t = Math.round(state.data_after + (state.data_before - state.data_after) * pct);
						if(NETDATA.dygraphSetSelection(state, t) === true)
							state.globalSelectionSync(t);
					}

					// if it was double tap within double click time, reset the charts
					var now = new Date().getTime();
					if(typeof state.dygraph_last_touch_end !== 'undefined') {
						if(state.dygraph_last_touch_move === 0) {
							var dt = now - state.dygraph_last_touch_end;
							if(dt <= NETDATA.options.current.double_click_speed)
								NETDATA.resetAllCharts(state);
						}
					}

					// remember the timestamp of the last touch end
					state.dygraph_last_touch_end = now;
				}
			}
		};

		if(NETDATA.chartLibraries.dygraph.isSparkline(state)) {
			state.dygraph_options.drawGrid = false;
			state.dygraph_options.drawAxis = false;
			state.dygraph_options.title = undefined;
			state.dygraph_options.units = undefined;
			state.dygraph_options.ylabel = undefined;
			state.dygraph_options.yLabelWidth = 0;
			state.dygraph_options.labelsDivWidth = 120;
			state.dygraph_options.labelsDivStyles.width = '120px';
			state.dygraph_options.labelsSeparateLines = true;
			state.dygraph_options.rightGap = 0;
		}

		if(smooth === true) {
			state.dygraph_smooth_eligible = true;

			if(NETDATA.options.current.smooth_plot === true)
				state.dygraph_options.plotter = smoothPlotter;
		}
		else state.dygraph_smooth_eligible = false;

		state.dygraph_instance = new Dygraph(state.element_chart,
			data.result.data, state.dygraph_options);

		state.dygraph_force_zoom = false;
		state.dygraph_user_action = false;
		state.dygraph_last_rendered = new Date().getTime();
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// morris

	NETDATA.morrisInitialize = function(callback) {
		if(typeof netdataNoMorris === 'undefined' || !netdataNoMorris) {

			// morris requires raphael
			if(!NETDATA.chartLibraries.raphael.initialized) {
				if(NETDATA.chartLibraries.raphael.enabled) {
					NETDATA.raphaelInitialize(function() {
						NETDATA.morrisInitialize(callback);
					});
				}
				else {
					NETDATA.chartLibraries.morris.enabled = false;
					if(typeof callback === "function")
						callback();
				}
			}
			else {
				NETDATA._loadCSS(NETDATA.morris_css);

				$.ajax({
					url: NETDATA.morris_js,
					cache: true,
					dataType: "script"
				})
				.done(function() {
					NETDATA.registerChartLibrary('morris', NETDATA.morris_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.morris.enabled = false;
					NETDATA.error(100, NETDATA.morris_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				});
			}
		}
		else {
			NETDATA.chartLibraries.morris.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.morrisChartUpdate = function(state, data) {
		state.morris_instance.setData(data.result.data);
		return true;
	};

	NETDATA.morrisChartCreate = function(state, data) {

		state.morris_options = {
				element: state.element_chart.id,
				data: data.result.data,
				xkey: 'time',
				ykeys: data.dimension_names,
				labels: data.dimension_names,
				lineWidth: 2,
				pointSize: 3,
				smooth: true,
				hideHover: 'auto',
				parseTime: true,
				continuousLine: false,
				behaveLikeLine: false
		};

		if(state.chart.chart_type === 'line')
			state.morris_instance = new Morris.Line(state.morris_options);

		else if(state.chart.chart_type === 'area') {
			state.morris_options.behaveLikeLine = true;
			state.morris_instance = new Morris.Area(state.morris_options);
		}
		else // stacked
			state.morris_instance = new Morris.Area(state.morris_options);
		
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// raphael

	NETDATA.raphaelInitialize = function(callback) {
		if(typeof netdataStopRaphael === 'undefined' || !netdataStopRaphael) {
			$.ajax({
				url: NETDATA.raphael_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('raphael', NETDATA.raphael_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.raphael.enabled = false;
				NETDATA.error(100, NETDATA.raphael_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.raphael.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.raphaelChartUpdate = function(state, data) {
		$(state.element_chart).raphael(data.result, {
			width: state.chartWidth(),
			height: state.chartHeight()
		});

		return false;
	};

	NETDATA.raphaelChartCreate = function(state, data) {
		$(state.element_chart).raphael(data.result, {
			width: state.chartWidth(),
			height: state.chartHeight()
		});

		return false;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// C3

	NETDATA.c3Initialize = function(callback) {
		if(typeof netdataNoC3 === 'undefined' || !netdataNoC3) {

			// C3 requires D3
			if(!NETDATA.chartLibraries.d3.initialized) {
				if(NETDATA.chartLibraries.d3.enabled) {
					NETDATA.d3Initialize(function() {
						NETDATA.c3Initialize(callback);
					});
				}
				else {
					NETDATA.chartLibraries.c3.enabled = false;
					if(typeof callback === "function")
						callback();
				}
			}
			else {
				NETDATA._loadCSS(NETDATA.c3_css);

				$.ajax({
					url: NETDATA.c3_js,
					cache: true,
					dataType: "script"
				})
				.done(function() {
					NETDATA.registerChartLibrary('c3', NETDATA.c3_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.c3.enabled = false;
					NETDATA.error(100, NETDATA.c3_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				});
			}
		}
		else {
			NETDATA.chartLibraries.c3.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.c3ChartUpdate = function(state, data) {
		state.c3_instance.destroy();
		return NETDATA.c3ChartCreate(state, data);

		//state.c3_instance.load({
		//	rows: data.result,
		//	unload: true
		//});

		//return true;
	};

	NETDATA.c3ChartCreate = function(state, data) {

		state.element_chart.id = 'c3-' + state.uuid;
		// console.log('id = ' + state.element_chart.id);

		state.c3_instance = c3.generate({
			bindto: '#' + state.element_chart.id,
			size: {
				width: state.chartWidth(),
				height: state.chartHeight()
			},
			color: {
				pattern: state.chartColors()
			},
			data: {
				x: 'time',
				rows: data.result,
				type: (state.chart.chart_type === 'line')?'spline':'area-spline'
			},
			axis: {
				x: {
					type: 'timeseries',
					tick: {
						format: function(x) {
							return NETDATA.zeropad(x.getHours()) + ":" + NETDATA.zeropad(x.getMinutes()) + ":" + NETDATA.zeropad(x.getSeconds());
						}
					}
				}
			},
			grid: {
				x: {
					show: true
				},
				y: {
					show: true
				}
			},
			point: {
				show: false
			},
			line: {
				connectNull: false
			},
			transition: {
				duration: 0
			},
			interaction: {
				enabled: true
			}
		});

		// console.log(state.c3_instance);

		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// D3

	NETDATA.d3Initialize = function(callback) {
		if(typeof netdataStopD3 === 'undefined' || !netdataStopD3) {
			$.ajax({
				url: NETDATA.d3_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('d3', NETDATA.d3_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.d3.enabled = false;
				NETDATA.error(100, NETDATA.d3_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.d3.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.d3ChartUpdate = function(state, data) {
		return false;
	};

	NETDATA.d3ChartCreate = function(state, data) {
		return false;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// google charts

	NETDATA.googleInitialize = function(callback) {
		if(typeof netdataNoGoogleCharts === 'undefined' || !netdataNoGoogleCharts) {
			$.ajax({
				url: NETDATA.google_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('google', NETDATA.google_js);
				google.load('visualization', '1.1', {
					'packages': ['corechart', 'controls'],
					'callback': callback
				});
			})
			.fail(function() {
				NETDATA.chartLibraries.google.enabled = false;
				NETDATA.error(100, NETDATA.google_js);
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.google.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.googleChartUpdate = function(state, data) {
		var datatable = new google.visualization.DataTable(data.result);
		state.google_instance.draw(datatable, state.google_options);
		return true;
	};

	NETDATA.googleChartCreate = function(state, data) {
		var datatable = new google.visualization.DataTable(data.result);

		state.google_options = {
			colors: state.chartColors(),

			// do not set width, height - the chart resizes itself
			//width: state.chartWidth(),
			//height: state.chartHeight(),
			lineWidth: 1,
			title: state.title,
			fontSize: 11,
			hAxis: {
			//	title: "Time of Day",
			//	format:'HH:mm:ss',
				viewWindowMode: 'maximized',
				slantedText: false,
				format:'HH:mm:ss',
				textStyle: {
					fontSize: 9
				},
				gridlines: {
					color: '#EEE'
				}
			},
			vAxis: {
				title: state.units,
				viewWindowMode: 'pretty',
				minValue: -0.1,
				maxValue: 0.1,
				direction: 1,
				textStyle: {
					fontSize: 9
				},
				gridlines: {
					color: '#EEE'
				}
			},
			chartArea: {
				width: '65%',
				height: '80%'
			},
			focusTarget: 'category',
			annotation: {
				'1': {
					style: 'line'
				}
			},
			pointsVisible: 0,
			titlePosition: 'out',
			titleTextStyle: {
				fontSize: 11
			},
			tooltip: {
				isHtml: false,
				ignoreBounds: true,
				textStyle: {
					fontSize: 9
				}
			},
			curveType: 'function',
			areaOpacity: 0.3,
			isStacked: false
		};

		switch(state.chart.chart_type) {
			case "area":
				state.google_options.vAxis.viewWindowMode = 'maximized';
				state.google_options.areaOpacity = NETDATA.options.current.color_fill_opacity_area;
				state.google_instance = new google.visualization.AreaChart(state.element_chart);
				break;

			case "stacked":
				state.google_options.isStacked = true;
				state.google_options.areaOpacity = NETDATA.options.current.color_fill_opacity_stacked;
				state.google_options.vAxis.viewWindowMode = 'maximized';
				state.google_options.vAxis.minValue = null;
				state.google_options.vAxis.maxValue = null;
				state.google_instance = new google.visualization.AreaChart(state.element_chart);
				break;

			default:
			case "line":
				state.google_options.lineWidth = 2;
				state.google_instance = new google.visualization.LineChart(state.element_chart);
				break;
		}

		state.google_instance.draw(datatable, state.google_options);
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------

	NETDATA.percentFromValueMax = function(value, max) {
		if(value === null) value = 0;
		if(max < value) max = value;
		
		var pcent = 0;
		if(max !== 0) {
			pcent = Math.round(value * 100 / max);
			if(pcent === 0 && value > 0) pcent = 1;
		}

		return pcent;
	}

	// ----------------------------------------------------------------------------------------------------------------
	// easy-pie-chart

	NETDATA.easypiechartInitialize = function(callback) {
		if(typeof netdataNoEasyPieChart === 'undefined' || !netdataNoEasyPieChart) {
			$.ajax({
				url: NETDATA.easypiechart_js,
				cache: true,
				dataType: "script"
			})
				.done(function() {
					NETDATA.registerChartLibrary('easypiechart', NETDATA.easypiechart_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.easypiechart.enabled = false;
					NETDATA.error(100, NETDATA.easypiechart_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				})
		}
		else {
			NETDATA.chartLibraries.easypiechart.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.easypiechartClearSelection = function(state) {
		if(typeof state.easyPieChartEvent !== 'undefined') {
			if(state.easyPieChartEvent.timer !== null)
				clearTimeout(state.easyPieChartEvent.timer);

			state.easyPieChartEvent.timer = null;
		}

		if(state.isAutoRefreshed() === true && state.data !== null) {
			NETDATA.easypiechartChartUpdate(state, state.data);
		}
		else {
			state.easyPieChartLabel.innerHTML = state.legendFormatValue(null);
			state.easyPieChart_instance.update(0);
		}
		state.easyPieChart_instance.enableAnimation();

		return true;
	};

	NETDATA.easypiechartSetSelection = function(state, t) {
		if(state.timeIsVisible(t) !== true)
			return NETDATA.easypiechartClearSelection(state);

		var slot = state.calculateRowForTime(t);
		if(slot < 0 || slot >= state.data.result.length)
			return NETDATA.easypiechartClearSelection(state);

		if(typeof state.easyPieChartEvent === 'undefined') {
			state.easyPieChartEvent = {
				timer: null,
				value: 0,
				pcent: 0,
			};
		}

		var value = state.data.result[state.data.result.length - 1 - slot];
		var max = (state.easyPieChartMax === null)?state.data.max:state.easyPieChartMax;
		var pcent = NETDATA.percentFromValueMax(value, max);

		state.easyPieChartEvent.value = value;
		state.easyPieChartEvent.pcent = pcent;
		state.easyPieChartLabel.innerHTML = state.legendFormatValue(value);

		if(state.easyPieChartEvent.timer === null) {
			state.easyPieChart_instance.disableAnimation();

			state.easyPieChartEvent.timer = setTimeout(function() {
				state.easyPieChartEvent.timer = null;
				state.easyPieChart_instance.update(state.easyPieChartEvent.pcent);
			}, NETDATA.options.current.charts_selection_animation_delay);
		}

		return true;
	};

	NETDATA.easypiechartChartUpdate = function(state, data) {
		var value, max, pcent;

		if(NETDATA.globalPanAndZoom.isActive() === true || state.isAutoRefreshed() === false) {
			value = null;
			max = 0;
			pcent = 0;
		}
		else {
			value = data.result[0];
			max = (state.easyPieChartMax === null)?data.max:state.easyPieChartMax;
			pcent = NETDATA.percentFromValueMax(value, max);
		}

		state.easyPieChartLabel.innerHTML = state.legendFormatValue(value);
		state.easyPieChart_instance.update(pcent);
		return true;
	};

	NETDATA.easypiechartChartCreate = function(state, data) {
		var self = $(state.element);
		var chart = $(state.element_chart);

		var value = data.result[0];
		var max = self.data('easypiechart-max-value') || null;
		var adjust = self.data('easypiechart-adjust') || null;
		
		if(max === null) {
			max = data.max;
			state.easyPieChartMax = null;
		}
		else
			state.easyPieChartMax = max;

		var pcent = NETDATA.percentFromValueMax(value, max);

		chart.data('data-percent', pcent);

		var size;
		switch(adjust) {
			case 'width': size = state.chartHeight(); break;
			case 'min': size = Math.min(state.chartWidth(), state.chartHeight()); break;
			case 'max': size = Math.max(state.chartWidth(), state.chartHeight()); break;
			case 'height':
			default: size = state.chartWidth(); break;
		}
		state.element.style.width = size + 'px';
		state.element.style.height = size + 'px';

		var stroke = Math.floor(size / 22);
		if(stroke < 3) stroke = 2;

		var valuefontsize = Math.floor((size * 2 / 3) / 5);
		var valuetop = Math.round((size - valuefontsize - (size / 40)) / 2);
		state.easyPieChartLabel = document.createElement('span');
		state.easyPieChartLabel.className = 'easyPieChartLabel';
		state.easyPieChartLabel.innerHTML = state.legendFormatValue(value);
		state.easyPieChartLabel.style.fontSize = valuefontsize + 'px';
		state.easyPieChartLabel.style.top = valuetop.toString() + 'px';
		state.element_chart.appendChild(state.easyPieChartLabel);

		var titlefontsize = Math.round(valuefontsize * 1.6 / 3);
		var titletop = Math.round(valuetop - (titlefontsize * 2) - (size / 40));
		state.easyPieChartTitle = document.createElement('span');
		state.easyPieChartTitle.className = 'easyPieChartTitle';
		state.easyPieChartTitle.innerHTML = state.title;
		state.easyPieChartTitle.style.fontSize = titlefontsize + 'px';
		state.easyPieChartTitle.style.lineHeight = titlefontsize + 'px';
		state.easyPieChartTitle.style.top = titletop.toString() + 'px';
		state.element_chart.appendChild(state.easyPieChartTitle);

		var unitfontsize = Math.round(titlefontsize * 0.9);
		var unittop = Math.round(valuetop + (valuefontsize + unitfontsize) + (size / 40));
		state.easyPieChartUnits = document.createElement('span');
		state.easyPieChartUnits.className = 'easyPieChartUnits';
		state.easyPieChartUnits.innerHTML = state.units;
		state.easyPieChartUnits.style.fontSize = unitfontsize + 'px';
		state.easyPieChartUnits.style.top = unittop.toString() + 'px';
		state.element_chart.appendChild(state.easyPieChartUnits);

		chart.easyPieChart({
			barColor: self.data('easypiechart-barcolor') || state.chartColors()[0], //'#ef1e25',
			trackColor: self.data('easypiechart-trackcolor') || NETDATA.themes.current.easypiechart_track,
			scaleColor: self.data('easypiechart-scalecolor') || NETDATA.themes.current.easypiechart_scale,
			scaleLength: self.data('easypiechart-scalelength') || 5,
			lineCap: self.data('easypiechart-linecap') || 'round',
			lineWidth: self.data('easypiechart-linewidth') || stroke,
			trackWidth: self.data('easypiechart-trackwidth') || undefined,
			size: self.data('easypiechart-size') || size,
			rotate: self.data('easypiechart-rotate') || 0,
			animate: self.data('easypiechart-rotate') || {duration: 500, enabled: true},
			easing: self.data('easypiechart-easing') || undefined
		});
		
		// when we just re-create the chart
		// do not animate the first update
		var animate = true;
		if(typeof state.easyPieChart_instance !== 'undefined')
			animate = false;

		state.easyPieChart_instance = chart.data('easyPieChart');
		if(animate === false) state.easyPieChart_instance.disableAnimation();
		state.easyPieChart_instance.update(pcent);
		if(animate === false) state.easyPieChart_instance.enableAnimation();
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// gauge.js

	NETDATA.gaugeInitialize = function(callback) {
		if(typeof netdataNoGauge === 'undefined' || !netdataNoGauge) {
			$.ajax({
				url: NETDATA.gauge_js,
				cache: true,
				dataType: "script"
			})
				.done(function() {
					NETDATA.registerChartLibrary('gauge', NETDATA.gauge_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.gauge.enabled = false;
					NETDATA.error(100, NETDATA.gauge_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				})
		}
		else {
			NETDATA.chartLibraries.gauge.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.gaugeAnimation = function(state, status) {
		var speed = 32;

		if(typeof status === 'boolean' && status === false)
			speed = 1000000000;
		else if(typeof status === 'number')
			speed = status;
		
		state.gauge_instance.animationSpeed = speed;
		state.___gaugeOld__.speed = speed;
	}

	NETDATA.gaugeSet = function(state, value, min, max) {
		if(typeof value !== 'number') value = 0;
		if(typeof min !== 'number') min = 0;
		if(typeof max !== 'number') max = 0;
		if(value > max) max = value;
		if(value < min) min = value;
		if(min > max) {
			var t = min;
			min = max;
			max = t;
		}
		else if(min == max)
			max = min + 1;

		// gauge.js has an issue if the needle
		// is smaller than min or larger than max
		// when we set the new values
		// the needle will go crazy

		// to prevent it, we always feed it
		// with a percentage, so that the needle
		// is always between min and max
		var pcent = (value - min) * 100 / (max - min);

		// these should never happen
		if(pcent < 0) pcent = 0;
		if(pcent > 100) pcent = 100;

		state.gauge_instance.set(pcent);

		state.___gaugeOld__.value = value;
		state.___gaugeOld__.min = min;
		state.___gaugeOld__.max = max;
	};

	NETDATA.gaugeSetLabels = function(state, value, min, max) {
		if(state.___gaugeOld__.valueLabel !== value) {
			state.___gaugeOld__.valueLabel = value;
			state.gaugeChartLabel.innerHTML = state.legendFormatValue(value);
		}
		if(state.___gaugeOld__.minLabel !== min) {
			state.___gaugeOld__.minLabel = min;
			state.gaugeChartMin.innerHTML = state.legendFormatValue(min);
		}
		if(state.___gaugeOld__.maxLabel !== max) {
			state.___gaugeOld__.maxLabel = max;
			state.gaugeChartMax.innerHTML = state.legendFormatValue(max);
		}
	};

	NETDATA.gaugeClearSelection = function(state) {
		if(typeof state.gaugeEvent !== 'undefined') {
			if(state.gaugeEvent.timer !== null)
				clearTimeout(state.gaugeEvent.timer);

			state.gaugeEvent.timer = null;
		}

		if(state.isAutoRefreshed() === true && state.data !== null) {
			NETDATA.gaugeChartUpdate(state, state.data);
		}
		else {
			NETDATA.gaugeAnimation(state, false);
			NETDATA.gaugeSet(state, null, null, null);
			NETDATA.gaugeSetLabels(state, null, null, null);
		}

		NETDATA.gaugeAnimation(state, true);
		return true;
	};

	NETDATA.gaugeSetSelection = function(state, t) {
		if(state.timeIsVisible(t) !== true)
			return NETDATA.gaugeClearSelection(state);

		var slot = state.calculateRowForTime(t);
		if(slot < 0 || slot >= state.data.result.length)
			return NETDATA.gaugeClearSelection(state);

		if(typeof state.gaugeEvent === 'undefined') {
			state.gaugeEvent = {
				timer: null,
				value: 0,
				min: 0,
				max: 0
			};
		}

		var value = state.data.result[state.data.result.length - 1 - slot];
		var max = (state.gaugeMax === null)?state.data.max:state.gaugeMax;
		var min = 0;

		state.gaugeEvent.value = value;
		state.gaugeEvent.max = max;
		state.gaugeEvent.min = min;
		NETDATA.gaugeSetLabels(state, value, min, max);

		if(state.gaugeEvent.timer === null) {
			NETDATA.gaugeAnimation(state, false);

			state.gaugeEvent.timer = setTimeout(function() {
				state.gaugeEvent.timer = null;
				NETDATA.gaugeSet(state, state.gaugeEvent.value, state.gaugeEvent.min, state.gaugeEvent.max);
			}, NETDATA.options.current.charts_selection_animation_delay);
		}

		return true;
	};

	NETDATA.gaugeChartUpdate = function(state, data) {
		var value, min, max;

		if(NETDATA.globalPanAndZoom.isActive() === true || state.isAutoRefreshed() === false) {
			value = 0;
			min = 0;
			max = 1;
			NETDATA.gaugeSetLabels(state, null, null, null);
		}
		else {
			value = data.result[0];
			min = 0;
			max = (state.gaugeMax === null)?data.max:state.gaugeMax;
			if(value > max) max = value;
			NETDATA.gaugeSetLabels(state, value, min, max);
		}

		NETDATA.gaugeSet(state, value, min, max);
		return true;
	};

	NETDATA.gaugeChartCreate = function(state, data) {
		var self = $(state.element);
		var chart = $(state.element_chart);

		var value = data.result[0];
		var max = self.data('gauge-max-value') || null;
		var adjust = self.data('gauge-adjust') || null;
		var pointerColor = self.data('gauge-pointer-color') || NETDATA.themes.current.gauge_pointer;
		var strokeColor = self.data('gauge-stroke-color') || NETDATA.themes.current.gauge_stroke;
		var startColor = self.data('gauge-start-color') || state.chartColors()[0];
		var stopColor = self.data('gauge-stop-color') || void 0;
		var generateGradient = self.data('gauge-generate-gradient') || false;

		if(max === null) {
			max = data.max;
			state.gaugeMax = null;
		}
		else
			state.gaugeMax = max;

		var width = state.chartWidth(), height = state.chartHeight(); //, ratio = 1.5;
		//switch(adjust) {
		//	case 'width': width = height * ratio; break;
		//	case 'height':
		//	default: height = width / ratio; break;
		//}
		//state.element.style.width = width.toString() + 'px';
		//state.element.style.height = height.toString() + 'px';

		var lum_d = 0.05;

		var options = {
			lines: 12,					// The number of lines to draw
			angle: 0.15,				// The length of each line
			lineWidth: 0.44,			// 0.44 The line thickness
			pointer: {
				length: 0.8,			// 0.9 The radius of the inner circle
				strokeWidth: 0.035,		// The rotation offset
				color: pointerColor		// Fill color
			},
			colorStart: startColor,		// Colors
			colorStop: stopColor,		// just experiment with them
			strokeColor: strokeColor,	// to see which ones work best for you
			limitMax: true,
			generateGradient: generateGradient,
			gradientType: 0
		};

		if(generateGradient === false && NETDATA.themes.current.gauge_gradient === true) {
			options.percentColors = [
				[0.0, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 0))],
				[0.1, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 1))],
				[0.2, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 2))],
				[0.3, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 3))],
				[0.4, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 4))],
				[0.5, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 5))],
				[0.6, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 6))],
				[0.7, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 7))],
				[0.8, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 8))],
				[0.9, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 9))],
				[1.0, NETDATA.colorLuminance(startColor, 0.0)]];
		}

		state.gauge_canvas = document.createElement('canvas');
		state.gauge_canvas.id = 'gauge-' + state.uuid + '-canvas';
		state.gauge_canvas.className = 'gaugeChart';
		state.gauge_canvas.width  = width;
		state.gauge_canvas.height = height;
		state.element_chart.appendChild(state.gauge_canvas);

		var valuefontsize = Math.floor(height / 6);
		var valuetop = Math.round((height - valuefontsize - (height / 6)) / 2);
		state.gaugeChartLabel = document.createElement('span');
		state.gaugeChartLabel.className = 'gaugeChartLabel';
		state.gaugeChartLabel.style.fontSize = valuefontsize + 'px';
		state.gaugeChartLabel.style.top = valuetop.toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartLabel);

		var titlefontsize = Math.round(valuefontsize / 2);
		var titletop = 0;
		state.gaugeChartTitle = document.createElement('span');
		state.gaugeChartTitle.className = 'gaugeChartTitle';
		state.gaugeChartTitle.innerHTML = state.title;
		state.gaugeChartTitle.style.fontSize = titlefontsize + 'px';
		state.gaugeChartTitle.style.lineHeight = titlefontsize + 'px';
		state.gaugeChartTitle.style.top = titletop.toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartTitle);

		var unitfontsize = Math.round(titlefontsize * 0.9);
		state.gaugeChartUnits = document.createElement('span');
		state.gaugeChartUnits.className = 'gaugeChartUnits';
		state.gaugeChartUnits.innerHTML = state.units;
		state.gaugeChartUnits.style.fontSize = unitfontsize + 'px';
		state.element_chart.appendChild(state.gaugeChartUnits);

		state.gaugeChartMin = document.createElement('span');
		state.gaugeChartMin.className = 'gaugeChartMin';
		state.gaugeChartMin.style.fontSize = Math.round(valuefontsize * 0.75).toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartMin);

		state.gaugeChartMax = document.createElement('span');
		state.gaugeChartMax.className = 'gaugeChartMax';
		state.gaugeChartMax.style.fontSize = Math.round(valuefontsize * 0.75).toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartMax);

		// when we just re-create the chart
		// do not animate the first update
		var animate = true;
		if(typeof state.gauge_instance !== 'undefined')
			animate = false;

		state.gauge_instance = new Gauge(state.gauge_canvas).setOptions(options); // create sexy gauge!

		state.___gaugeOld__ = {
			value: value,
			min: 0,
			max: max,
			valueLabel: null,
			minLabel: null,
			maxLabel: null
		};
		
		// we will always feed a percentage
		state.gauge_instance.minValue = 0;
		state.gauge_instance.maxValue = 100;

		NETDATA.gaugeAnimation(state, animate);
		NETDATA.gaugeSet(state, value, 0, max);
		NETDATA.gaugeSetLabels(state, value, 0, max);
		NETDATA.gaugeAnimation(state, true);
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Charts Libraries Registration

	NETDATA.chartLibraries = {
		"dygraph": {
			initialize: NETDATA.dygraphInitialize,
			create: NETDATA.dygraphChartCreate,
			update: NETDATA.dygraphChartUpdate,
			resize: function(state) {
				if(typeof state.dygraph_instance.resize === 'function')
					state.dygraph_instance.resize();
			},
			setSelection: NETDATA.dygraphSetSelection,
			clearSelection:  NETDATA.dygraphClearSelection,
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return 'ms|flip'; },
			legend: function(state) {
				if(this.isSparkline(state) === false)
					return 'right-side';
				else
					return null;
			},
			autoresize: function(state) { return true; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return true; },
			pixels_per_point: function(state) {
				if(this.isSparkline(state) === false)
					return 3;
				else
					return 2;
			},

			isSparkline: function(state) {
				if(typeof state.dygraph_sparkline === 'undefined') {
					var t = $(state.element).data('dygraph-theme');
					if(t === 'sparkline')
						state.dygraph_sparkline = true;
					else
						state.dygraph_sparkline = false;
				}
				return state.dygraph_sparkline;
			}
		},
		"sparkline": {
			initialize: NETDATA.sparklineInitialize,
			create: NETDATA.sparklineChartCreate,
			update: NETDATA.sparklineChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			initialized: false,
			enabled: true,
			format: function(state) { return 'array'; },
			options: function(state) { return 'flip|abs'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"peity": {
			initialize: NETDATA.peityInitialize,
			create: NETDATA.peityChartCreate,
			update: NETDATA.peityChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			initialized: false,
			enabled: true,
			format: function(state) { return 'ssvcomma'; },
			options: function(state) { return 'null2zero|flip|abs'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"morris": {
			initialize: NETDATA.morrisInitialize,
			create: NETDATA.morrisChartCreate,
			update: NETDATA.morrisChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return 'objectrows|ms'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 50; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 15; }
		},
		"google": {
			initialize: NETDATA.googleInitialize,
			create: NETDATA.googleChartCreate,
			update: NETDATA.googleChartUpdate,
			resize: null,
			setSelection: undefined, //function(state, t) { return true; },
			clearSelection: undefined, //function(state) { return true; },
			initialized: false,
			enabled: true,
			format: function(state) { return 'datatable'; },
			options: function(state) { return ''; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 300; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 4; }
		},
		"raphael": {
			initialize: NETDATA.raphaelInitialize,
			create: NETDATA.raphaelChartCreate,
			update: NETDATA.raphaelChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return ''; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"c3": {
			initialize: NETDATA.c3Initialize,
			create: NETDATA.c3ChartCreate,
			update: NETDATA.c3ChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			initialized: false,
			enabled: true,
			format: function(state) { return 'csvjsonarray'; },
			options: function(state) { return 'milliseconds'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 15; }
		},
		"d3": {
			initialize: NETDATA.d3Initialize,
			create: NETDATA.d3ChartCreate,
			update: NETDATA.d3ChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return ''; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"easypiechart": {
			initialize: NETDATA.easypiechartInitialize,
			create: NETDATA.easypiechartChartCreate,
			update: NETDATA.easypiechartChartUpdate,
			resize: null,
			setSelection: NETDATA.easypiechartSetSelection,
			clearSelection: NETDATA.easypiechartClearSelection,
			initialized: false,
			enabled: true,
			format: function(state) { return 'array'; },
			options: function(state) { return 'absolute'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return true; },
			pixels_per_point: function(state) { return 3; },
			aspect_ratio: 100
		},
		"gauge": {
			initialize: NETDATA.gaugeInitialize,
			create: NETDATA.gaugeChartCreate,
			update: NETDATA.gaugeChartUpdate,
			resize: null,
			setSelection: NETDATA.gaugeSetSelection,
			clearSelection: NETDATA.gaugeClearSelection,
			initialized: false,
			enabled: true,
			format: function(state) { return 'array'; },
			options: function(state) { return 'absolute'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return true; },
			pixels_per_point: function(state) { return 3; },
			aspect_ratio: 70
		}
	};

	NETDATA.registerChartLibrary = function(library, url) {
		if(NETDATA.options.debug.libraries === true)
			console.log("registering chart library: " + library);

		NETDATA.chartLibraries[library].url = url;
		NETDATA.chartLibraries[library].initialized = true;
		NETDATA.chartLibraries[library].enabled = true;
	}

	// ----------------------------------------------------------------------------------------------------------------
	// Start up

	NETDATA.requiredJs = [
		{
			url: NETDATA.serverDefault + 'lib/bootstrap.min.js',
			isAlreadyLoaded: function() {
				if(typeof $().emulateTransitionEnd == 'function')
					return true;
				else {
					if(typeof netdataNoBootstrap !== 'undefined' && netdataNoBootstrap)
						return true;
					else
						return false;
				}
			}
		},
		{
			url: NETDATA.serverDefault + 'lib/jquery.nanoscroller.min.js',
			isAlreadyLoaded: function() { return false; }
		},
		{
			url: NETDATA.serverDefault + 'lib/bootstrap-toggle.min.js',
			isAlreadyLoaded: function() { return false; }
		}
	];

	NETDATA.requiredCSS = [
		{
			url: NETDATA.themes.current.bootstrap_css,
			isAlreadyLoaded: function() {
				if(typeof netdataNoBootstrap !== 'undefined' && netdataNoBootstrap)
					return true;
				else
					return false;
			}
		},
		{
			url: NETDATA.serverDefault + 'css/font-awesome.min.css',
			isAlreadyLoaded: function() { return false; }
		},
		{
			url: NETDATA.themes.current.dashboard_css,
			isAlreadyLoaded: function() { return false; }
		},
		{
			url: NETDATA.serverDefault + 'css/bootstrap-toggle.min.css',
			isAlreadyLoaded: function() { return false; }
		}
	];

	NETDATA.loadRequiredJs = function(index, callback) {
		if(index >= NETDATA.requiredJs.length)  {
			if(typeof callback === 'function')
				callback();
			return;
		}

		if(NETDATA.requiredJs[index].isAlreadyLoaded()) {
			NETDATA.loadRequiredJs(++index, callback);
			return;
		}

		if(NETDATA.options.debug.main_loop === true)
			console.log('loading ' + NETDATA.requiredJs[index].url);

		$.ajax({
			url: NETDATA.requiredJs[index].url,
			cache: true,
			dataType: "script"
		})
		.success(function() {
			if(NETDATA.options.debug.main_loop === true)
				console.log('loaded ' + NETDATA.requiredJs[index].url);

			NETDATA.loadRequiredJs(++index, callback);
		})
		.fail(function() {
			alert('Cannot load required JS library: ' + NETDATA.requiredJs[index].url);
		})
	}

	NETDATA.loadRequiredCSS = function(index) {
		if(index >= NETDATA.requiredCSS.length)
			return;

		if(NETDATA.requiredCSS[index].isAlreadyLoaded()) {
			NETDATA.loadRequiredCSS(++index);
			return;
		}

		if(NETDATA.options.debug.main_loop === true)
			console.log('loading ' + NETDATA.requiredCSS[index].url);

		NETDATA._loadCSS(NETDATA.requiredCSS[index].url);
		NETDATA.loadRequiredCSS(++index);
	}

	NETDATA.errorReset();
	NETDATA.loadRequiredCSS(0);

	NETDATA._loadjQuery(function() {
		NETDATA.loadRequiredJs(0, function() {
			if(typeof netdataDontStart === 'undefined' || !netdataDontStart) {
				if(NETDATA.options.debug.main_loop === true)
					console.log('starting chart refresh thread');

				NETDATA.start();
			}
		});
	});

	// window.NETDATA = NETDATA;
// })(window, document);
