# 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 import messages
import mediagoblin.mg_globals as mg_globals
from os.path import splitext

import logging

_log = logging.getLogger(__name__)

from werkzeug.datastructures import FileStorage

from mediagoblin.tools.text import convert_to_tag_list_of_dicts
from mediagoblin.tools.translate import pass_to_ugettext as _
from mediagoblin.tools.response import render_to_response, redirect
from mediagoblin.decorators import require_active_login
from mediagoblin.submit import forms as submit_forms
from mediagoblin.messages import add_message, SUCCESS
from mediagoblin.media_types import sniff_media, \
    InvalidFileType, FileTypeNotSupported
from mediagoblin.submit.lib import handle_push_urls, run_process_media, \
    prepare_entry


@require_active_login
def submit_start(request):
    """
    First view for submitting a file.
    """
    submit_form = submit_forms.SubmitStartForm(request.form)

    if request.method == 'POST' and submit_form.validate():
        if not ('file' in request.files
                and isinstance(request.files['file'], FileStorage)
                and request.files['file'].stream):
            submit_form.file.errors.append(
                _(u'You must provide a file.'))
        else:
            try:
                filename = request.files['file'].filename

                # Sniff the submitted media to determine which
                # media plugin should handle processing
                media_type, media_manager = sniff_media(
                    request.files['file'])

                # create entry and save in database
                entry = request.db.MediaEntry()
                entry.media_type = unicode(media_type)
                entry.title = (
                    unicode(request.form['title'])
                    or unicode(splitext(filename)[0]))

                entry.description = unicode(request.form.get('description'))

                entry.license = unicode(request.form.get('license', "")) or None

                entry.uploader = request.user.id

                # Process the user's folksonomy "tags"
                entry.tags = convert_to_tag_list_of_dicts(
                    request.form.get('tags'))

                # Generate a slug from the title
                entry.generate_slug()

                queue_file = prepare_entry(request, entry, filename)

                with queue_file:
                    queue_file.write(request.files['file'].stream.read())

                # Save now so we have this data before kicking off processing
                entry.save()

                # Pass off to processing
                #
                # (... don't change entry after this point to avoid race
                # conditions with changes to the document via processing code)
                run_process_media(entry)

                handle_push_urls(request)

                add_message(request, SUCCESS, _('Woohoo! Submitted!'))

                return redirect(request, "mediagoblin.user_pages.user_home",
                                user=request.user.username)
            except Exception as e:
                '''
                This section is intended to catch exceptions raised in
                mediagoblin.media_types
                '''
                if isinstance(e, InvalidFileType) or \
                        isinstance(e, FileTypeNotSupported):
                    submit_form.file.errors.append(
                        e)
                else:
                    raise

    return render_to_response(
        request,
        'mediagoblin/submit/start.html',
        {'submit_form': submit_form,
         'app_config': mg_globals.app_config})

@require_active_login
def add_collection(request, media=None):
    """
    View to create a new collection
    """
    submit_form = submit_forms.AddCollectionForm(request.form)

    if request.method == 'POST' and submit_form.validate():
        try:
            collection = request.db.Collection()

            collection.title = unicode(request.form['title'])
            collection.description = unicode(request.form.get('description'))
            collection.creator = request.user.id
            collection.generate_slug()

            # Make sure this user isn't duplicating an existing collection
            existing_collection = request.db.Collection.find_one({
                    'creator': request.user.id,
                    'title':collection.title})

            if existing_collection:
                messages.add_message(
                    request, messages.ERROR, _('You already have a collection called "%s"!' % collection.title))
            else:
                collection.save()

                add_message(request, SUCCESS, _('Collection "%s" added!' % collection.title))

            return redirect(request, "mediagoblin.user_pages.user_home",
                            user=request.user.username)

        except Exception as e:
            raise

    return render_to_response(
        request,
        'mediagoblin/submit/collection.html',
        {'submit_form': submit_form,
         'app_config': mg_globals.app_config})