# -*- coding: utf-8 -*-

# Copyright © 2012-2016 Roberto Alsina and others.

# Permission is hereby granted, free of charge, to any
# person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice
# shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

"""Chart directive for reSTructuredText."""

from ast import literal_eval

from docutils import nodes
from docutils.parsers.rst import Directive, directives

try:
    import pygal
except ImportError:
    pygal = None  # NOQA

from nikola.plugin_categories import RestExtension
from nikola.utils import req_missing

_site = None


class Plugin(RestExtension):
    """Plugin for chart role."""

    name = "rest_chart"

    def set_site(self, site):
        """Set Nikola site."""
        global _site
        _site = self.site = site
        directives.register_directive('chart', Chart)
        self.site.register_shortcode('chart', _gen_chart)
        return super(Plugin, self).set_site(site)


class Chart(Directive):
    """reStructuredText extension for inserting charts as SVG.

    Usage:
        .. chart:: Bar
           :title: 'Browser usage evolution (in %)'
           :x_labels: ["2002", "2003", "2004", "2005", "2006", "2007"]

           'Firefox', [None, None, 0, 16.6, 25, 31]
           'Chrome',  [None, None, None, None, None, None]
           'IE',      [85.8, 84.6, 84.7, 74.5, 66, 58.6]
           'Others',  [14.2, 15.4, 15.3, 8.9, 9, 10.4]
    """

    has_content = True
    required_arguments = 1
    option_spec = {
        "copy": directives.unchanged,
        "css": directives.unchanged,
        "disable_xml_declaration": directives.unchanged,
        "dots_size": directives.unchanged,
        "explicit_size": directives.unchanged,
        "fill": directives.unchanged,
        "font_sizes": directives.unchanged,
        "height": directives.unchanged,
        "human_readable": directives.unchanged,
        "include_x_axis": directives.unchanged,
        "interpolate": directives.unchanged,
        "interpolation_parameters": directives.unchanged,
        "interpolation_precision": directives.unchanged,
        "js": directives.unchanged,
        "label_font_size": directives.unchanged,
        "legend_at_bottom": directives.unchanged,
        "legend_box_size": directives.unchanged,
        "legend_font_size": directives.unchanged,
        "logarithmic": directives.unchanged,
        "major_label_font_size": directives.unchanged,
        "margin": directives.unchanged,
        "no_data_font_size": directives.unchanged,
        "no_data_text": directives.unchanged,
        "no_prefix": directives.unchanged,
        "order_min": directives.unchanged,
        "pretty_print": directives.unchanged,
        "print_values": directives.unchanged,
        "print_zeroes": directives.unchanged,
        "range": directives.unchanged,
        "rounded_bars": directives.unchanged,
        "show_dots": directives.unchanged,
        "show_legend": directives.unchanged,
        "show_minor_x_labels": directives.unchanged,
        "show_y_labels": directives.unchanged,
        "spacing": directives.unchanged,
        "strict": directives.unchanged,
        "stroke": directives.unchanged,
        "style": directives.unchanged,
        "title": directives.unchanged,
        "title_font_size": directives.unchanged,
        "to_dict": directives.unchanged,
        "tooltip_border_radius": directives.unchanged,
        "tooltip_font_size": directives.unchanged,
        "truncate_label": directives.unchanged,
        "truncate_legend": directives.unchanged,
        "value_font_size": directives.unchanged,
        "value_formatter": directives.unchanged,
        "width": directives.unchanged,
        "x_label_rotation": directives.unchanged,
        "x_labels": directives.unchanged,
        "x_labels_major": directives.unchanged,
        "x_labels_major_count": directives.unchanged,
        "x_labels_major_every": directives.unchanged,
        "x_title": directives.unchanged,
        "y_label_rotation": directives.unchanged,
        "y_labels": directives.unchanged,
        "y_title": directives.unchanged,
        "zero": directives.unchanged,
    }

    def run(self):
        """Run the directive."""
        self.options['site'] = None
        html = _gen_chart(self.arguments[0], data='\n'.join(self.content), **self.options)
        return [nodes.raw('', html, format='html')]


def _gen_chart(chart_type, **_options):
    if pygal is None:
        msg = req_missing(['pygal'], 'use the Chart directive', optional=True)
        return '<div class="text-error">{0}</div>'.format(msg)
    options = {}
    data = _options.pop('data')
    _options.pop('site')
    if 'style' in _options:
        style_name = _options.pop('style')
    else:
        style_name = 'BlueStyle'
    if '(' in style_name:  # Parametric style
        style = eval('pygal.style.' + style_name)
    else:
        style = getattr(pygal.style, style_name)
    for k, v in _options.items():
        try:
            options[k] = literal_eval(v)
        except:
            options[k] = v
    chart = pygal
    for o in chart_type.split('.'):
        chart = getattr(chart, o)
    chart = chart(style=style)
    if _site and _site.invariant:
        chart.no_prefix = True
    chart.config(**options)
    for line in data.splitlines():
        line = line.strip()
        if line:
            label, series = literal_eval('({0})'.format(line))
            chart.add(label, series)
    return chart.render().decode('utf8')
