from django_filters.rest_framework import DjangoFilterBackend
from rest_framework import status, viewsets
from rest_framework.decorators import action
from rest_framework.filters import OrderingFilter, SearchFilter
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from apps.annotations.models import Bookmark, Note
from apps.annotations.permissions import IsOwner
from apps.annotations.serializers import (
    BookmarkCreateSerializer,
    BookmarkSerializer,
    NoteCreateSerializer,
    NoteSerializer,
)


class BookmarkViewSet(viewsets.ModelViewSet):
    """CRUD for user ebook markers (passage anchors + optional thoughts)."""

    permission_classes = [IsAuthenticated, IsOwner]
    filter_backends = [DjangoFilterBackend, SearchFilter, OrderingFilter]
    filterset_fields = ["ebook"]
    search_fields = ["location_text", "content", "chapter_title"]
    ordering_fields = ["chapter_index", "epub_cfi", "created_at"]
    ordering = ["chapter_index", "epub_cfi"]

    def get_serializer_class(self):
        if self.action == "create":
            return BookmarkCreateSerializer
        return BookmarkSerializer

    def get_queryset(self):
        return Bookmark.objects.filter(user=self.request.user).select_related("ebook")

    def perform_create(self, serializer):
        serializer.save(user=self.request.user)

    @action(detail=False, methods=["delete"], url_path="batch-delete")
    def batch_delete(self, request):
        ids = request.data.get("ids", [])
        if not ids:
            return Response(
                {"detail": "No ids provided."}, status=status.HTTP_400_BAD_REQUEST
            )
        deleted, _ = Bookmark.objects.filter(
            id__in=ids, user=request.user
        ).delete()
        return Response({"deleted": deleted}, status=status.HTTP_200_OK)


class NoteViewSet(viewsets.ModelViewSet):
    """Legacy notes API (catalog Book FK)."""

    permission_classes = [IsAuthenticated, IsOwner]
    filter_backends = [DjangoFilterBackend, SearchFilter, OrderingFilter]
    filterset_fields = ["book"]
    search_fields = ["content", "location_text"]
    ordering_fields = ["created_at", "page"]
    ordering = ["-created_at"]

    def get_serializer_class(self):
        if self.action == "create":
            return NoteCreateSerializer
        return NoteSerializer

    def get_queryset(self):
        return Note.objects.filter(user=self.request.user).select_related("book")

    def perform_create(self, serializer):
        serializer.save(user=self.request.user)

    @action(detail=False, methods=["delete"], url_path="batch-delete")
    def batch_delete(self, request):
        ids = request.data.get("ids", [])
        if not ids:
            return Response(
                {"detail": "No ids provided."}, status=status.HTTP_400_BAD_REQUEST
            )
        deleted, _ = Note.objects.filter(
            id__in=ids, user=request.user
        ).delete()
        return Response({"deleted": deleted}, status=status.HTTP_200_OK)