# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
from mediagoblin.db.models import MediaEntry
from mediagoblin.gmg_commands import util as commands_util
from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
from mediagoblin.tools.pluginapi import hook_handle


def reprocess_parser_setup(subparser):
    subparser.add_argument(
        '--available', '-a',
        action="store_true",
        help="List available actions for a given media entry")
    subparser.add_argument(
        '--all', '-A',
        action="store_true",
        help="Reprocess all media entries")
    subparser.add_argument(
        '--state', '-s',
        help="Reprocess media entries in this state"
             " such as 'failed' or 'processed'")
    subparser.add_argument(
        '--type', '-t',
        help="The type of media to be reprocessed such as 'video' or 'image'")
    subparser.add_argument(
        'media_id',
        nargs='*',
        help="The media_entry id(s) you wish to reprocess.")


class MismatchingMediaTypes(Exception):
    """
    Error that should be raised if the media_types are not the same
    """
    pass


def _set_media_type(args):
    if len(args[0].media_id) == 1:
        media_type = MediaEntry.query.filter_by(id=args[0].media_id[0])\
                .first().media_type.split('.')[-1]

        if not args[0].type:
            args[0].type = media_type
        elif args[0].type != media_type:
            raise MismatchingMediaTypes(_('The type that you set does not'
                                          ' match the type of the given'
                                          ' media_id.'))
    elif len(args[0].media_id) > 1:
        media_types = []

        for id in args[0].media_id:
            media_types.append(MediaEntry.query.filter_by(id=id).first()\
                               .media_type.split('.')[-1])
        for type in media_types:
            if media_types[0] != type:
                raise MismatchingMediaTypes((u'You cannot reprocess different'
                        ' media_types at the same time.'))

        if not args[0].type:
            args[0].type = media_types[0]
        elif args[0].type != media_types[0]:
            raise MismatchingMediaTypes(_('The type that you set does not'
                                          ' match the type of the given'
                                          ' media_ids.'))

    elif not args[0].type:
        raise MismatchingMediaTypes(_('You must provide either a media_id or'
                                      ' set the --type flag'))


def _reprocess_all(args):
    if not args[0].type:
        if args[0].state == 'failed':
            if args[0].available:
                print '\n Available reprocess actions for all failed' \
                      ' media_entries: \n \t --initial_processing'
                return
            else:
                #TODO reprocess all failed entries
                pass
        else:
            raise Exception(_('You must set --type when trying to reprocess'
                              ' all media_entries, unless you set --state'
                              ' to "failed".'))

    _run_reprocessing(args)


def _run_reprocessing(args):
    if args[0].available:
        return hook_handle(('reprocess_action', args[0].type), args)
    else:
        return hook_handle(('media_reprocess', args[0].type), args)


def reprocess(args):
    commands_util.setup_app(args[0])

    if not args[0].state:
        args[0].state = 'processed'

    if args[0].all:
        return _reprocess_all(args)

    _set_media_type(args)

    return _run_reprocessing(args)