from rest_framework import viewsets, status
from rest_framework.decorators import action
from rest_framework.response import Response
from django.db.models import Q
from django.core.files.base import ContentFile
from django.contrib.contenttypes.models import ContentType
from adventures.models import Location, Transportation, Note, Lodging, Visit, ContentImage
from adventures.serializers import ContentImageSerializer
from integrations.models import ImmichIntegration
from adventures.permissions import IsOwnerOrSharedWithFullAccess  # Your existing permission class
import requests


class ContentImagePermission(IsOwnerOrSharedWithFullAccess):
    """
    Specialized permission for ContentImage objects that checks permissions
    on the related content object.
    """
    
    def has_object_permission(self, request, view, obj):
        """
        For ContentImage objects, check permissions on the related content object.
        """
        if not request.user or not request.user.is_authenticated:
            return False
            
        # Get the related content object
        content_object = obj.content_object
        if not content_object:
            return False
        
        # Use the parent permission class to check access to the content object
        return super().has_object_permission(request, view, content_object)


class ContentImageViewSet(viewsets.ModelViewSet):
    serializer_class = ContentImageSerializer
    permission_classes = [ContentImagePermission]

    def get_queryset(self):
        """Get all images the user has access to"""
        if not self.request.user.is_authenticated:
            return ContentImage.objects.none()
        
        # Import here to avoid circular imports
        from adventures.models import Location, Transportation, Note, Lodging, Visit
        
        # Build a single query with all conditions
        return ContentImage.objects.filter(
            # User owns the image directly (if user field exists on ContentImage)
            Q(user=self.request.user) |
            
            # Or user has access to the content object
            (
                # Locations owned by user
                Q(content_type=ContentType.objects.get_for_model(Location)) &
                Q(object_id__in=Location.objects.filter(user=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Shared locations
                Q(content_type=ContentType.objects.get_for_model(Location)) &
                Q(object_id__in=Location.objects.filter(collections__shared_with=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Collections owned by user containing locations
                Q(content_type=ContentType.objects.get_for_model(Location)) &
                Q(object_id__in=Location.objects.filter(collections__user=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Transportation owned by user
                Q(content_type=ContentType.objects.get_for_model(Transportation)) &
                Q(object_id__in=Transportation.objects.filter(user=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Notes owned by user
                Q(content_type=ContentType.objects.get_for_model(Note)) &
                Q(object_id__in=Note.objects.filter(user=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Lodging owned by user
                Q(content_type=ContentType.objects.get_for_model(Lodging)) &
                Q(object_id__in=Lodging.objects.filter(user=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Visits - access through location's user
                Q(content_type=ContentType.objects.get_for_model(Visit)) &
                Q(object_id__in=Visit.objects.filter(location__user=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Visits - access through shared locations
                Q(content_type=ContentType.objects.get_for_model(Visit)) &
                Q(object_id__in=Visit.objects.filter(location__collections__shared_with=self.request.user).values_list('id', flat=True))
            ) |
            (
                # Visits - access through collections owned by user
                Q(content_type=ContentType.objects.get_for_model(Visit)) &
                Q(object_id__in=Visit.objects.filter(location__collections__user=self.request.user).values_list('id', flat=True))
            )
        ).distinct()

    @action(detail=True, methods=['post'])
    def image_delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)
    
    @action(detail=True, methods=['post'])
    def toggle_primary(self, request, *args, **kwargs):
        instance = self.get_object()
        
        # Check if the image is already the primary image
        if instance.is_primary:
            return Response(
                {"error": "Image is already the primary image"}, 
                status=status.HTTP_400_BAD_REQUEST
            )
        
        # Set other images of the same content object to not primary
        ContentImage.objects.filter(
            content_type=instance.content_type,
            object_id=instance.object_id,
            is_primary=True
        ).update(is_primary=False)

        # Set the new image to primary
        instance.is_primary = True
        instance.save()
        return Response({"success": "Image set as primary image"})

    def create(self, request, *args, **kwargs):
        # Get content type and object ID from request
        content_type_name = request.data.get('content_type')
        object_id = request.data.get('object_id')
        
        if not content_type_name or not object_id:
            return Response({
                "error": "content_type and object_id are required"
            }, status=status.HTTP_400_BAD_REQUEST)
        
        # Get the content object and validate permissions
        content_object = self._get_and_validate_content_object(content_type_name, object_id)
        if isinstance(content_object, Response):  # Error response
            return content_object
        
        content_type = ContentType.objects.get_for_model(content_object.__class__)
        
        # Handle Immich ID for shared users by downloading the image
        if (hasattr(content_object, 'user') and 
            request.user != content_object.user and 
            'immich_id' in request.data and 
            request.data.get('immich_id')):
            
            return self._handle_immich_image_creation(request, content_object, content_type, object_id)
        
        # Standard image creation
        return self._create_standard_image(request, content_object, content_type, object_id)
    
    def _get_and_validate_content_object(self, content_type_name, object_id):
        """Get and validate the content object exists and user has access"""
        # Map content type names to model classes
        content_type_map = {
            'location': Location,
            'transportation': Transportation,
            'note': Note,
            'lodging': Lodging,
            'visit': Visit,
        }
        
        if content_type_name not in content_type_map:
            return Response({
                "error": f"Invalid content_type. Must be one of: {', '.join(content_type_map.keys())}"
            }, status=status.HTTP_400_BAD_REQUEST)
        
        # Get the content object
        try:
            content_object = content_type_map[content_type_name].objects.get(id=object_id)
        except (ValueError, content_type_map[content_type_name].DoesNotExist):
            return Response({
                "error": f"{content_type_name} not found"
            }, status=status.HTTP_404_NOT_FOUND)
        
        # Check permissions using the permission class
        permission_checker = IsOwnerOrSharedWithFullAccess()
        if not permission_checker.has_object_permission(self.request, self, content_object):
            return Response({
                "error": "User does not have permission to access this content"
            }, status=status.HTTP_403_FORBIDDEN)
        
        return content_object
    
    def _handle_immich_image_creation(self, request, content_object, content_type, object_id):
        """Handle creation of image from Immich for shared users"""
        immich_id = request.data.get('immich_id')
        
        # Get the shared user's Immich integration
        try:
            user_integration = ImmichIntegration.objects.get(user=request.user)
        except ImmichIntegration.DoesNotExist:
            return Response({
                "error": "No Immich integration found for your account. Please set up Immich integration first.",
                "code": "immich_integration_not_found"
            }, status=status.HTTP_400_BAD_REQUEST)
        
        # Download the image from the shared user's Immich server
        try:
            immich_response = requests.get(
                f'{user_integration.server_url}/assets/{immich_id}/thumbnail?size=preview',
                headers={'x-api-key': user_integration.api_key},
                timeout=10
            )
            immich_response.raise_for_status()
            
            # Create a temporary file with the downloaded content
            content_type_header = immich_response.headers.get('Content-Type', 'image/jpeg')
            if not content_type_header.startswith('image/'):
                return Response({
                    "error": "Invalid content type returned from Immich server.",
                    "code": "invalid_content_type"
                }, status=status.HTTP_400_BAD_REQUEST)
            
            # Determine file extension from content type
            ext_map = {
                'image/jpeg': '.jpg',
                'image/png': '.png',
                'image/webp': '.webp',
                'image/gif': '.gif'
            }
            file_ext = ext_map.get(content_type_header, '.jpg')
            filename = f"immich_{immich_id}{file_ext}"
            
            # Create a Django ContentFile from the downloaded image
            image_file = ContentFile(immich_response.content, name=filename)
            
            # Modify request data to use the downloaded image instead of immich_id
            request_data = request.data.copy()
            request_data.pop('immich_id', None)  # Remove immich_id
            request_data['image'] = image_file  # Add the image file
            request_data['content_type'] = content_type.id
            request_data['object_id'] = object_id
            
            # Create the serializer with the modified data
            serializer = self.get_serializer(data=request_data)
            serializer.is_valid(raise_exception=True)
            
            # Save with the downloaded image
            serializer.save(
                user=content_object.user if hasattr(content_object, 'user') else request.user,
                image=image_file,
                content_type=content_type,
                object_id=object_id
            )
            
            return Response(serializer.data, status=status.HTTP_201_CREATED)
            
        except requests.exceptions.RequestException:
            return Response({
                "error": f"Failed to fetch image from Immich server",
                "code": "immich_fetch_failed"
            }, status=status.HTTP_502_BAD_GATEWAY)
        except Exception:
            return Response({
                "error": f"Unexpected error processing Immich image",
                "code": "immich_processing_error"
            }, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
    
    def _create_standard_image(self, request, content_object, content_type, object_id):
        """Handle standard image creation"""
        # Add content type and object ID to request data
        request_data = request.data.copy()
        request_data['content_type'] = content_type.id
        request_data['object_id'] = object_id
        
        # Create serializer with modified data
        serializer = self.get_serializer(data=request_data)
        serializer.is_valid(raise_exception=True)
        
        # Save the image
        serializer.save(
            user=content_object.user if hasattr(content_object, 'user') else request.user,
            content_type=content_type,
            object_id=object_id
        )
        
        return Response(serializer.data, status=status.HTTP_201_CREATED)
    
    def perform_create(self, serializer):
        # The content_type and object_id are already set in the create method
        # Just ensure the user is set correctly
        pass