# -*- coding: utf-8 -*-
#
# Copyright © 2012 - 2020 Michal Čihař <michal@cihar.com>
#
# This file is part of Weblate <https://weblate.org/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#

from __future__ import unicode_literals

from django.conf import settings
from django.db import models
from six import python_2_unicode_compatible

from weblate.trans.mixins import UserDisplayMixin
from weblate.trans.models.change import Change


class CommentManager(models.Manager):
    # pylint: disable=no-init

    def add(self, unit, user, text):
        """Add comment to this unit."""
        new_comment = self.create(
            user=user,
            unit=unit,
            comment=text,
        )
        Change.objects.create(
            unit=unit,
            comment=new_comment,
            action=Change.ACTION_COMMENT,
            user=user,
            author=user,
            details={'comment': text},
        )


class CommentQuerySet(models.QuerySet):
    def order(self):
        return self.order_by('timestamp')


@python_2_unicode_compatible
class Comment(models.Model, UserDisplayMixin):
    unit = models.ForeignKey(
        "trans.Unit",
        on_delete=models.deletion.CASCADE,
    )
    comment = models.TextField()
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.deletion.CASCADE,
    )
    timestamp = models.DateTimeField(auto_now_add=True, db_index=True)

    objects = CommentManager.from_queryset(CommentQuerySet)()

    class Meta(object):
        app_label = 'trans'

    def __str__(self):
        return 'comment for {0} by {1}'.format(
            self.unit, self.user.username if self.user else 'unknown'
        )
