# Copyright (C) 2014 Andrey Antukh <niwi@niwi.be>
# Copyright (C) 2014 Jesús Espino <jespinog@gmail.com>
# Copyright (C) 2014 David Barragán <bameda@dbarragan.com>
# 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.base.api import serializers
from taiga.base.fields import TagsField
from taiga.base.fields import PgArrayField
from taiga.base.neighbors import NeighborsSerializerMixin


from taiga.mdrender.service import render as mdrender
from taiga.projects.validators import ProjectExistsValidator
from taiga.projects.notifications.validators import WatchersValidator
from taiga.projects.serializers import BasicIssueStatusSerializer
from taiga.users.serializers import BasicInfoSerializer as UserBasicInfoSerializer

from . import models


class IssueSerializer(WatchersValidator, serializers.ModelSerializer):
    tags = TagsField(required=False)
    external_reference = PgArrayField(required=False)
    is_closed = serializers.Field(source="is_closed")
    comment = serializers.SerializerMethodField("get_comment")
    generated_user_stories = serializers.SerializerMethodField("get_generated_user_stories")
    blocked_note_html = serializers.SerializerMethodField("get_blocked_note_html")
    description_html = serializers.SerializerMethodField("get_description_html")
    votes = serializers.SerializerMethodField("get_votes_number")
    status_extra_info = BasicIssueStatusSerializer(source="status", required=False, read_only=True)
    assigned_to_extra_info = UserBasicInfoSerializer(source="assigned_to", required=False, read_only=True)

    class Meta:
        model = models.Issue
        read_only_fields = ('id', 'ref', 'created_date', 'modified_date')

    def get_comment(self, obj):
        # NOTE: This method and field is necessary to historical comments work
        return ""

    def get_generated_user_stories(self, obj):
        return obj.generated_user_stories.values("id", "ref", "subject")

    def get_blocked_note_html(self, obj):
        return mdrender(obj.project, obj.blocked_note)

    def get_description_html(self, obj):
        return mdrender(obj.project, obj.description)

    def get_votes_number(self, obj):
        # The "votes_count" attribute is attached in the get_queryset of the viewset.
        return getattr(obj, "votes_count", 0)


class IssueNeighborsSerializer(NeighborsSerializerMixin, IssueSerializer):
    def serialize_neighbor(self, neighbor):
        return NeighborIssueSerializer(neighbor).data


class NeighborIssueSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Issue
        fields = ("id", "ref", "subject")
        depth = 0


class IssuesBulkSerializer(ProjectExistsValidator, serializers.Serializer):
    project_id = serializers.IntegerField()
    bulk_issues = serializers.CharField()