from functools import partial

from django.core.exceptions import ValidationError
from django.shortcuts import get_object_or_404
from rest_framework import generics, status
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from api.models import Project
from labels.models import Category, Span, TextLabel, Relation
from members.permissions import IsProjectMember
from .permissions import CanEditLabel
from .serializers import CategorySerializer, SpanSerializer, TextLabelSerializer, RelationSerializer


class BaseListAPI(generics.ListCreateAPIView):
    label_class = None
    pagination_class = None
    permission_classes = [IsAuthenticated & IsProjectMember]
    swagger_schema = None

    @property
    def project(self):
        return get_object_or_404(Project, pk=self.kwargs['project_id'])

    def get_queryset(self):
        queryset = self.label_class.objects.filter(example=self.kwargs['example_id'])
        if not self.project.collaborative_annotation:
            queryset = queryset.filter(user=self.request.user)
        return queryset

    def create(self, request, *args, **kwargs):
        request.data['example'] = self.kwargs['example_id']
        try:
            response = super().create(request, args, kwargs)
        except ValidationError as err:
            response = Response({'detail': err.messages}, status=status.HTTP_400_BAD_REQUEST)
        return response

    def perform_create(self, serializer):
        serializer.save(example_id=self.kwargs['example_id'], user=self.request.user)

    def delete(self, request, *args, **kwargs):
        queryset = self.get_queryset()
        queryset.all().delete()
        return Response(status=status.HTTP_204_NO_CONTENT)


class BaseDetailAPI(generics.RetrieveUpdateDestroyAPIView):
    lookup_url_kwarg = 'annotation_id'
    swagger_schema = None

    @property
    def project(self):
        return get_object_or_404(Project, pk=self.kwargs['project_id'])

    def get_permissions(self):
        if self.project.collaborative_annotation:
            self.permission_classes = [IsAuthenticated & IsProjectMember]
        else:
            self.permission_classes = [
                IsAuthenticated & IsProjectMember & partial(CanEditLabel, self.queryset)
            ]
        return super().get_permissions()


class CategoryListAPI(BaseListAPI):
    label_class = Category
    serializer_class = CategorySerializer

    def create(self, request, *args, **kwargs):
        if self.project.single_class_classification:
            self.get_queryset().delete()
        return super().create(request, args, kwargs)


class CategoryDetailAPI(BaseDetailAPI):
    queryset = Category.objects.all()
    serializer_class = CategorySerializer


class SpanListAPI(BaseListAPI):
    label_class = Span
    serializer_class = SpanSerializer


class SpanDetailAPI(BaseDetailAPI):
    queryset = Span.objects.all()
    serializer_class = SpanSerializer


class TextLabelListAPI(BaseListAPI):
    label_class = TextLabel
    serializer_class = TextLabelSerializer


class TextLabelDetailAPI(BaseDetailAPI):
    queryset = TextLabel.objects.all()
    serializer_class = TextLabelSerializer


class RelationList(generics.ListCreateAPIView):
    serializer_class = RelationSerializer
    pagination_class = None
    permission_classes = [IsAuthenticated & IsProjectMember]

    def get_queryset(self):
        project = get_object_or_404(Project, pk=self.kwargs['project_id'])
        return project.annotation_relations

    def perform_create(self, serializer):
        project = get_object_or_404(Project, pk=self.kwargs['project_id'])
        serializer.save(project=project)

    def delete(self, request, *args, **kwargs):
        delete_ids = request.data['ids']
        Relation.objects.filter(pk__in=delete_ids).delete()
        return Response(status=status.HTTP_204_NO_CONTENT)


class RelationDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Relation.objects.all()
    serializer_class = RelationSerializer
    lookup_url_kwarg = 'annotation_id'
    permission_classes = [IsAuthenticated & IsProjectMember]