# Copyright (c) 2009-2023 - Simon Conseil
# Copyright (c)      2014 - Jamie Starke

# 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
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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"""Plugin which generates HTML pages for each image.

Currently this plugin can be used only with the colorbox theme, the other
themes have to be adapted.

For themes, the ``previous_media`` and ``next_media`` variables contain the
previous/next :class:`~sigal.gallery.Media` objects.

"""

import os

from sigal import signals
from sigal.utils import url_from_path
from sigal.writer import AbstractWriter


class PageWriter(AbstractWriter):
    """A writer for writing media pages, based on writer"""

    template_file = "media.html"

    def write(self, album, media_group):
        """Generate the media page and save it"""

        from sigal import __url__ as sigal_link

        ctx = {
            "album": album,
            "media": media_group[0],
            "previous_media": media_group[-1],
            "next_media": media_group[1],
            "index_title": self.index_title,
            "settings": self.settings,
            "sigal_link": sigal_link,
            "theme": {
                "name": os.path.basename(self.theme),
                "url": url_from_path(os.path.relpath(self.theme_path, album.dst_path)),
            },
        }
        page = self.template.render(ctx)

        file_path = os.path.join(album.dst_path, media_group[0].dst_filename)
        output_file = f"{file_path}.html"

        with open(output_file, "w", encoding="utf-8") as f:
            f.write(page)


def generate_media_pages(gallery):
    """Generates and writes the media pages for all media in the gallery"""

    writer = PageWriter(gallery.settings, index_title=gallery.title)

    for album in gallery.albums.values():
        medias = album.medias
        next_medias = medias[1:] + [None]
        previous_medias = [None] + medias[:-1]

        # The media group allows us to easily get next and previous links
        media_groups = zip(medias, next_medias, previous_medias)

        for media_group in media_groups:
            writer.write(album, media_group)


def register(settings):
    signals.gallery_build.connect(generate_media_pages)
