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

# Copyright © 2012-2020 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
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"""Generate redirections."""


import os

from nikola.plugin_categories import Task
from nikola import utils


class Redirect(Task):
    """Generate redirections."""

    name = "redirect"

    def gen_tasks(self):
        """Generate redirections tasks."""
        kw = {
            'redirections': self.site.config['REDIRECTIONS'],
            'output_folder': self.site.config['OUTPUT_FOLDER'],
            'filters': self.site.config['FILTERS'],
        }

        yield self.group_task()
        if kw['redirections']:
            for src, dst in kw["redirections"]:
                src_path = os.path.join(kw["output_folder"], src.lstrip('/'))
                yield utils.apply_filters({
                    'basename': self.name,
                    'name': src_path,
                    'targets': [src_path],
                    'actions': [(utils.create_redirect, (src_path, dst))],
                    'clean': True,
                    'uptodate': [utils.config_changed(kw, 'nikola.plugins.task.redirect')],
                }, kw["filters"])
