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

# Copyright © 2014-2019 Pelle Nilsson and others.

# Permission is hereby granted, free of charge, to any
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# documentation files (the "Software"), to deal in the
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# 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.
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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"""Thumbnail directive for reStructuredText."""

import os

from docutils.parsers.rst import directives
from docutils.parsers.rst.directives.images import Image, Figure

from nikola.plugin_categories import RestExtension


class Plugin(RestExtension):
    """Plugin for thumbnail directive."""

    name = "rest_thumbnail"

    def set_site(self, site):
        """Set Nikola site."""
        self.site = site
        directives.register_directive('thumbnail', Thumbnail)
        return super(Plugin, self).set_site(site)


class Thumbnail(Figure):
    """Thumbnail directive for reST."""

    def align(argument):
        """Return thumbnail alignment."""
        return directives.choice(argument, Image.align_values)

    def figwidth_value(argument):
        """Return figure width."""
        if argument.lower() == 'image':
            return 'image'
        else:
            return directives.length_or_percentage_or_unitless(argument, 'px')

    option_spec = Image.option_spec.copy()
    option_spec['figwidth'] = figwidth_value
    option_spec['figclass'] = directives.class_option
    has_content = True

    def run(self):
        """Run the thumbnail directive."""
        uri = directives.uri(self.arguments[0])
        if uri.endswith('.svg'):
            # the ? at the end makes docutil output an <img> instead of an object for the svg, which lightboxes may require
            self.arguments[0] = '.thumbnail'.join(os.path.splitext(uri)) + '?'
        else:
            self.arguments[0] = '.thumbnail'.join(os.path.splitext(uri))
        self.options['target'] = uri
        if self.content:
            (node,) = Figure.run(self)
        else:
            (node,) = Image.run(self)
        return [node]
