from django.utils import timezone
from django_filters.rest_framework import DjangoFilterBackend
from rest_framework import filters, permissions, status, viewsets
from rest_framework.decorators import action
from rest_framework.response import Response

from .models import Report, Ticket
from .serializers import (
    ReportCreateSerializer,
    ReportResolveSerializer,
    ReportSerializer,
    TicketSerializer,
)


class TicketViewSet(viewsets.ModelViewSet):
    """
    Standard users/guests can CREATE.
    Only Staff can LIST/RETRIEVE/UPDATE all.
    Users can LIST/RETRIEVE their own.
    """

    queryset = Ticket.objects.all()
    serializer_class = TicketSerializer
    permission_classes = [permissions.AllowAny]  # We handle granular perms in get_queryset/perform_create
    filter_backends = [DjangoFilterBackend, filters.OrderingFilter]
    filterset_fields = ["status", "category"]
    ordering_fields = ["created_at", "status"]
    ordering = ["-created_at"]

    def get_queryset(self):
        user = self.request.user
        if user.is_staff:
            return Ticket.objects.all()
        if user.is_authenticated:
            return Ticket.objects.filter(user=user)
        return Ticket.objects.none()  # Guests can't list tickets

    def perform_create(self, serializer):
        if self.request.user.is_authenticated:
            serializer.save(user=self.request.user, email=self.request.user.email)
        else:
            serializer.save()


class ReportViewSet(viewsets.ModelViewSet):
    """
    ViewSet for handling user-submitted content reports.
    
    - Authenticated users can CREATE reports
    - Staff can LIST/RETRIEVE all reports
    - Users can LIST/RETRIEVE their own reports
    - Staff can RESOLVE reports
    """

    queryset = Report.objects.select_related("reporter", "resolved_by", "content_type").all()
    permission_classes = [permissions.IsAuthenticated]
    filter_backends = [DjangoFilterBackend, filters.OrderingFilter, filters.SearchFilter]
    filterset_fields = ["status", "report_type"]
    search_fields = ["reason", "resolution_notes"]
    ordering_fields = ["created_at", "status", "report_type"]
    ordering = ["-created_at"]

    def get_serializer_class(self):
        if self.action == "create":
            return ReportCreateSerializer
        if self.action == "resolve":
            return ReportResolveSerializer
        return ReportSerializer

    def get_queryset(self):
        user = self.request.user
        if user.is_staff:
            return Report.objects.select_related("reporter", "resolved_by", "content_type").all()
        return Report.objects.select_related("reporter", "resolved_by", "content_type").filter(reporter=user)

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

    @action(detail=True, methods=["post"], permission_classes=[permissions.IsAdminUser])
    def resolve(self, request, pk=None):
        """Mark a report as resolved or dismissed."""
        report = self.get_object()

        if report.is_resolved:
            return Response(
                {"detail": "Report is already resolved"},
                status=status.HTTP_400_BAD_REQUEST,
            )

        serializer = ReportResolveSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)

        report.status = serializer.validated_data.get("status", "resolved")
        report.resolved_at = timezone.now()
        report.resolved_by = request.user
        report.resolution_notes = serializer.validated_data.get("notes", "")
        report.save()

        return Response(ReportSerializer(report).data)