# 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 rest_framework import serializers

from taiga.base.serializers import (Serializer, TagsField, NeighborsSerializerMixin,
        PgArrayField, ModelSerializer)

from taiga.mdrender.service import render as mdrender
from taiga.projects.validators import ProjectExistsValidator
from taiga.projects.notifications.validators import WatchersValidator

from . import models


class IssueSerializer(WatchersValidator, 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")

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


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