# -*- coding: utf-8 -*-
# Copyright (C) 2014-2017 Andrey Antukh <niwi@niwi.nz>
# Copyright (C) 2014-2017 Jesús Espino <jespinog@gmail.com>
# Copyright (C) 2014-2017 David Barragán <bameda@dbarragan.com>
# Copyright (C) 2014-2017 Alejandro Alonso <alejandro.alonso@kaleidos.net>
# Copyright (C) 2014-2017 Anler Hernández <hello@anler.me>
# 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 taiga.projects.attachments.utils import attach_basic_attachments
from taiga.projects.notifications.utils import attach_watchers_to_queryset
from taiga.projects.notifications.utils import attach_total_watchers_to_queryset
from taiga.projects.notifications.utils import attach_is_watcher_to_queryset
from taiga.projects.votes.utils import attach_total_voters_to_queryset
from taiga.projects.votes.utils import attach_is_voter_to_queryset


def attach_extra_info(queryset, user=None, include_attachments=False):
    if include_attachments:
        queryset = attach_basic_attachments(queryset)
        queryset = queryset.extra(select={"include_attachments": "True"})

    queryset = attach_user_stories_counts_to_queryset(queryset)
    queryset = attach_total_voters_to_queryset(queryset)
    queryset = attach_watchers_to_queryset(queryset)
    queryset = attach_total_watchers_to_queryset(queryset)
    queryset = attach_is_voter_to_queryset(queryset, user)
    queryset = attach_is_watcher_to_queryset(queryset, user)
    return queryset


def attach_user_stories_counts_to_queryset(queryset, as_field="user_stories_counts"):
    model = queryset.model
    sql = """SELECT (SELECT row_to_json(t)
                       FROM (SELECT COALESCE(SUM(CASE WHEN is_closed IS FALSE THEN 1 ELSE 0 END), 0) AS "opened",
                                    COALESCE(SUM(CASE WHEN is_closed IS TRUE THEN 1 ELSE 0 END), 0)  AS "closed"
                            ) t
                    )
               FROM epics_relateduserstory
         INNER JOIN userstories_userstory ON epics_relateduserstory.user_story_id = userstories_userstory.id
              WHERE epics_relateduserstory.epic_id = {tbl}.id"""

    sql = sql.format(tbl=model._meta.db_table)
    queryset = queryset.extra(select={as_field: sql})
    return queryset
