"""Validated board template library input and output."""

from rest_framework import serializers

from tasks.access import task_board_access_q
from tasks.models import TaskBoard, TaskBoardTemplate
from tasks.templates import snapshot_board_structure


class TaskBoardTemplateSerializer(serializers.ModelSerializer):
    source_board_id = serializers.IntegerField(write_only=True, required=False)
    created_by_id = serializers.IntegerField(read_only=True)

    class Meta:
        model = TaskBoardTemplate
        fields = [
            "id",
            "name",
            "description",
            "is_shared",
            "created_by_id",
            "source_board_id",
            "layout",
            "created_at",
            "updated_at",
        ]
        read_only_fields = ["id", "layout", "created_at", "updated_at", "created_by_id"]

    def validate(self, attrs):
        attrs = super().validate(attrs)
        user = self.context["request"].user
        if self.instance is None:
            board_id = attrs.pop("source_board_id", None)
            if board_id is None:
                raise serializers.ValidationError(
                    {"source_board_id": "Выберите доску."}
                )
            board = (
                TaskBoard.objects.filter(id=board_id, is_archived=False)
                .filter(task_board_access_q(user))
                .first()
            )
            if board is None:
                raise serializers.ValidationError(
                    {"source_board_id": "Доска не найдена."}
                )
            self._source_board = board
        if attrs.get(
            "is_shared",
            self.instance.is_shared if self.instance else False,
        ) and not (user.is_staff or user.is_superuser):
            raise serializers.ValidationError(
                {"is_shared": "Публиковать общие шаблоны может только администратор."}
            )
        return attrs

    def create(self, validated_data):
        return TaskBoardTemplate.objects.create(
            layout=snapshot_board_structure(self._source_board),
            **validated_data,
        )


class TaskBoardTemplateInstantiateSerializer(serializers.Serializer):
    name = serializers.CharField(max_length=255, required=False, trim_whitespace=True)