# -*- 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
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# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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"""Implementation of compile_html based on pandoc.

You will need, of course, to install pandoc
"""

from __future__ import unicode_literals

import io
import os
import subprocess

from nikola.plugin_categories import PageCompiler
from nikola.utils import req_missing, makedirs, write_metadata
from nikola.shortcodes import apply_shortcodes


class CompilePandoc(PageCompiler):
    """Compile markups into HTML using pandoc."""

    name = "pandoc"
    friendly_name = "pandoc"

    def set_site(self, site):
        """Set Nikola site."""
        self.config_dependencies = [str(site.config['PANDOC_OPTIONS'])]
        super(CompilePandoc, self).set_site(site)

    def compile_html(self, source, dest, is_two_file=True):
        """Compile source file into HTML and save as dest."""
        makedirs(os.path.dirname(dest))
        try:
            subprocess.check_call(['pandoc', '-o', dest, source] + self.site.config['PANDOC_OPTIONS'])
            with open(dest, 'r', encoding='utf-8') as inf:
                output = apply_shortcodes(inf.read(), self.site.shortcode_registry, self.site, source)
            with open(dest, 'w', encoding='utf-8') as outf:
                outf.write(output)
        except OSError as e:
            if e.strreror == 'No such file or directory':
                req_missing(['pandoc'], 'build this site (compile with pandoc)', python=False)

    def create_post(self, path, **kw):
        """Create a new post."""
        content = kw.pop('content', None)
        onefile = kw.pop('onefile', False)
        # is_page is not used by create_post as of now.
        kw.pop('is_page', False)
        metadata = {}
        metadata.update(self.default_metadata)
        metadata.update(kw)
        makedirs(os.path.dirname(path))
        if not content.endswith('\n'):
            content += '\n'
        with io.open(path, "w+", encoding="utf8") as fd:
            if onefile:
                fd.write('<!--\n')
                fd.write(write_metadata(metadata))
                fd.write('-->\n\n')
            fd.write(content)
