"""
Appreciation views - API views for appreciation management
"""
from django.contrib.contenttypes.models import ContentType
from django.db.models import Count, Q, F
from django.utils import timezone
from rest_framework import generics, status, viewsets
from rest_framework.decorators import action
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from apps.appreciation.models import (
    Appreciation,
    AppreciationBadge,
    AppreciationCategory,
    AppreciationStats,
    UserBadge,
)
from apps.appreciation.serializers import (
    AppreciationBadgeSerializer,
    AppreciationCategorySerializer,
    AppreciationCreateSerializer,
    AppreciationLeaderboardSerializer,
    AppreciationSerializer,
    AppreciationStatsSerializer,
    AppreciationSummarySerializer,
    UserBadgeSerializer,
)
from apps.accounts.permissions import IsPXAdminOrHospitalAdmin


class AppreciationCategoryViewSet(viewsets.ModelViewSet):
    """Viewset for AppreciationCategory"""
    
    queryset = AppreciationCategory.objects.all()
    serializer_class = AppreciationCategorySerializer
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        """Filter categories by hospital"""
        queryset = super().get_queryset()
        
        # Filter by hospital if provided
        hospital_id = self.request.query_params.get('hospital_id')
        if hospital_id:
            queryset = queryset.filter(Q(hospital_id=hospital_id) | Q(hospital__isnull=True))
        
        # Only show active categories
        queryset = queryset.filter(is_active=True)
        
        return queryset.select_related('hospital')


class AppreciationViewSet(viewsets.ModelViewSet):
    """Viewset for Appreciation"""
    
    queryset = Appreciation.objects.all()
    serializer_class = AppreciationSerializer
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        """Filter appreciations based on user's access"""
        user = self.request.user
        queryset = super().get_queryset()
        
        # Filter by hospital
        if user.hospital:
            queryset = queryset.filter(hospital=user.hospital)
        
        # Filter by department if user is department manager
        if user.department and user.is_department_manager():
            queryset = queryset.filter(
                Q(department=user.department) | Q(department__isnull=True)
            )
        
        # Filter by visibility
        # Users can see:
        # - All appreciations they sent
        # - All appreciations they received
        # - Department-level appreciations if they're in the department
        # - Hospital-level appreciations if they're in the hospital
        # - Public appreciations
        
        from apps.appreciation.models import AppreciationVisibility
        
        # Get user's content type
        user_content_type = ContentType.objects.get_for_model(user)
        
        # Get physician if user has a physician profile
        physician = None
        if hasattr(user, 'physician_profile'):
            physician = user.phician_profile
            physician_content_type = ContentType.objects.get_for_model(type(physician))
        
        # Build visibility filter
        visibility_filter = (
            Q(sender=user) |  # Sent by user
            Q(
                recipient_content_type=user_content_type,
                recipient_object_id=user.id
            )  # Received by user
        )
        
        if physician:
            visibility_filter |= Q(
                recipient_content_type=physician_content_type,
                recipient_object_id=physician.id
            )  # Received by physician
        
        if user.department:
            visibility_filter |= Q(
                visibility=AppreciationVisibility.DEPARTMENT,
                department=user.department
            )
        
        if user.hospital:
            visibility_filter |= Q(
                visibility=AppreciationVisibility.HOSPITAL,
                hospital=user.hospital
            )
        
        visibility_filter |= Q(visibility=AppreciationVisibility.PUBLIC)
        
        queryset = queryset.filter(visibility_filter)
        
        # Filter by recipient
        recipient_type = self.request.query_params.get('recipient_type')
        recipient_id = self.request.query_params.get('recipient_id')
        if recipient_type and recipient_id:
            if recipient_type == 'user':
                content_type = ContentType.objects.get_for_model(
                    self.request.user.__class__
                )
                queryset = queryset.filter(
                    recipient_content_type=content_type,
                    recipient_object_id=recipient_id
                )
            elif recipient_type == 'physician':
                from apps.organizations.models import Physician
                content_type = ContentType.objects.get_for_model(Physician)
                queryset = queryset.filter(
                    recipient_content_type=content_type,
                    recipient_object_id=recipient_id
                )
        
        # Filter by status
        status_filter = self.request.query_params.get('status')
        if status_filter:
            queryset = queryset.filter(status=status_filter)
        
        # Filter by category
        category_id = self.request.query_params.get('category_id')
        if category_id:
            queryset = queryset.filter(category_id=category_id)
        
        return queryset.select_related(
            'sender', 'hospital', 'department', 'category'
        ).prefetch_related('recipient')
    
    def create(self, request, *args, **kwargs):
        """Create a new appreciation"""
        serializer = AppreciationCreateSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        
        # Get validated data
        data = serializer.validated_data
        
        # Get recipient
        recipient_type = data['recipient_type']
        recipient_id = data['recipient_id']
        
        if recipient_type == 'user':
            from apps.accounts.models import User
            recipient = User.objects.get(id=recipient_id)
            content_type = ContentType.objects.get_for_model(User)
        else:  # physician
            from apps.organizations.models import Physician
            recipient = Physician.objects.get(id=recipient_id)
            content_type = ContentType.objects.get_for_model(Physician)
        
        # Get hospital
        from apps.organizations.models import Hospital
        hospital = Hospital.objects.get(id=data['hospital_id'])
        
        # Get department
        department = None
        if data.get('department_id'):
            from apps.organizations.models import Department
            department = Department.objects.get(id=data['department_id'])
        
        # Get category
        category = None
        if data.get('category_id'):
            category = AppreciationCategory.objects.get(id=data['category_id'])
        
        # Create appreciation
        appreciation = Appreciation.objects.create(
            sender=request.user,
            recipient_content_type=content_type,
            recipient_object_id=recipient_id,
            hospital=hospital,
            department=department,
            category=category,
            message_en=data['message_en'],
            message_ar=data.get('message_ar', ''),
            visibility=data['visibility'],
            is_anonymous=data['is_anonymous'],
        )
        
        # Send appreciation
        appreciation.send()
        
        # Serialize and return
        serializer = AppreciationSerializer(appreciation)
        return Response(serializer.data, status=status.HTTP_201_CREATED)
    
    @action(detail=True, methods=['post'])
    def acknowledge(self, request, pk=None):
        """Acknowledge an appreciation"""
        appreciation = self.get_object()
        
        # Check if user is the recipient
        user_content_type = ContentType.objects.get_for_model(request.user)
        if not (
            appreciation.recipient_content_type == user_content_type and
            appreciation.recipient_object_id == request.user.id
        ):
            return Response(
                {'error': 'You can only acknowledge appreciations sent to you'},
                status=status.HTTP_403_FORBIDDEN
            )
        
        # Acknowledge
        appreciation.acknowledge()
        
        # Serialize and return
        serializer = AppreciationSerializer(appreciation)
        return Response(serializer.data)
    
    @action(detail=False, methods=['get'])
    def my_appreciations(self, request):
        """Get appreciations for the current user"""
        # Get user's appreciations
        user_content_type = ContentType.objects.get_for_model(request.user)
        
        # Check if user has physician profile
        physician = None
        if hasattr(request.user, 'physician_profile'):
            physician = request.user.physician_profile
        
        # Build query
        queryset = self.get_queryset().filter(
            Q(
                recipient_content_type=user_content_type,
                recipient_object_id=request.user.id
            )
        )
        
        if physician:
            physician_content_type = ContentType.objects.get_for_model(type(physician))
            queryset |= self.get_queryset().filter(
                recipient_content_type=physician_content_type,
                recipient_object_id=physician.id
            )
        
        # Paginate
        page = self.paginate_queryset(queryset)
        if page is not None:
            serializer = AppreciationSerializer(page, many=True)
            return self.get_paginated_response(serializer.data)
        
        serializer = AppreciationSerializer(queryset, many=True)
        return Response(serializer.data)
    
    @action(detail=False, methods=['get'])
    def sent_by_me(self, request):
        """Get appreciations sent by the current user"""
        queryset = self.get_queryset().filter(sender=request.user)
        
        # Paginate
        page = self.paginate_queryset(queryset)
        if page is not None:
            serializer = AppreciationSerializer(page, many=True)
            return self.get_paginated_response(serializer.data)
        
        serializer = AppreciationSerializer(queryset, many=True)
        return Response(serializer.data)
    
    @action(detail=False, methods=['get'])
    def summary(self, request):
        """Get appreciation summary for the current user"""
        # Get user's content type
        user_content_type = ContentType.objects.get_for_model(request.user)
        
        # Get current year and month
        now = timezone.now()
        current_year = now.year
        current_month = now.month
        
        # Count total received
        total_received = Appreciation.objects.filter(
            recipient_content_type=user_content_type,
            recipient_object_id=request.user.id
        ).count()
        
        # Count total sent
        total_sent = Appreciation.objects.filter(
            sender=request.user
        ).count()
        
        # Count this month received
        this_month_received = Appreciation.objects.filter(
            recipient_content_type=user_content_type,
            recipient_object_id=request.user.id,
            sent_at__year=current_year,
            sent_at__month=current_month
        ).count()
        
        # Count this month sent
        this_month_sent = Appreciation.objects.filter(
            sender=request.user,
            sent_at__year=current_year,
            sent_at__month=current_month
        ).count()
        
        # Get badges earned
        badges_earned = UserBadge.objects.filter(
            recipient_content_type=user_content_type,
            recipient_object_id=request.user.id
        ).count()
        
        # Get hospital rank
        hospital_rank = None
        if request.user.hospital:
            # Get stats for this month
            stats = AppreciationStats.objects.filter(
                recipient_content_type=user_content_type,
                recipient_object_id=request.user.id,
                year=current_year,
                month=current_month
            ).first()
            if stats:
                hospital_rank = stats.hospital_rank
        
        # Get top category
        top_category = None
        if total_received > 0:
            top_category_obj = Appreciation.objects.filter(
                recipient_content_type=user_content_type,
                recipient_object_id=request.user.id
            ).values('category__name_en', 'category__icon', 'category__color').annotate(
                count=Count('id')
            ).order_by('-count').first()
            
            if top_category_obj and top_category_obj['category__name_en']:
                top_category = {
                    'name': top_category_obj['category__name_en'],
                    'icon': top_category_obj['category__icon'],
                    'color': top_category_obj['category__color'],
                    'count': top_category_obj['count']
                }
        
        # Build response
        summary = {
            'total_received': total_received,
            'total_sent': total_sent,
            'this_month_received': this_month_received,
            'this_month_sent': this_month_sent,
            'top_category': top_category,
            'badges_earned': badges_earned,
            'hospital_rank': hospital_rank,
        }
        
        serializer = AppreciationSummarySerializer(summary)
        return Response(serializer.data)


class AppreciationStatsViewSet(viewsets.ReadOnlyModelViewSet):
    """Viewset for AppreciationStats"""
    
    queryset = AppreciationStats.objects.all()
    serializer_class = AppreciationStatsSerializer
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        """Filter stats based on user's access"""
        user = self.request.user
        queryset = super().get_queryset()
        
        # Filter by hospital
        if user.hospital:
            queryset = queryset.filter(hospital=user.hospital)
        
        # Filter by year and month
        year = self.request.query_params.get('year')
        if year:
            queryset = queryset.filter(year=int(year))
        
        month = self.request.query_params.get('month')
        if month:
            queryset = queryset.filter(month=int(month))
        
        return queryset.select_related('hospital', 'department')


class AppreciationBadgeViewSet(viewsets.ModelViewSet):
    """Viewset for AppreciationBadge"""
    
    queryset = AppreciationBadge.objects.all()
    serializer_class = AppreciationBadgeSerializer
    permission_classes = [IsAuthenticated, IsPXAdminOrHospitalAdmin]
    
    def get_queryset(self):
        """Filter badges by hospital"""
        queryset = super().get_queryset()
        
        # Filter by hospital if provided
        hospital_id = self.request.query_params.get('hospital_id')
        if hospital_id:
            queryset = queryset.filter(Q(hospital_id=hospital_id) | Q(hospital__isnull=True))
        
        # Only show active badges
        queryset = queryset.filter(is_active=True)
        
        return queryset.select_related('hospital')


class UserBadgeViewSet(viewsets.ReadOnlyModelViewSet):
    """Viewset for UserBadge"""
    
    queryset = UserBadge.objects.all()
    serializer_class = UserBadgeSerializer
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        """Filter badges based on user's access"""
        user = self.request.user
        queryset = super().get_queryset()
        
        # Get user's content type
        user_content_type = ContentType.objects.get_for_model(user)
        
        # Filter by user or user's physician profile
        physician = None
        if hasattr(user, 'physician_profile'):
            physician = user.physician_profile
            physician_content_type = ContentType.objects.get_for_model(type(physician))
        
        queryset = queryset.filter(
            Q(
                recipient_content_type=user_content_type,
                recipient_object_id=user.id
            )
        )
        
        if physician:
            queryset |= queryset.filter(
                recipient_content_type=physician_content_type,
                recipient_object_id=physician.id
            )
        
        return queryset.select_related('badge')


class LeaderboardView(generics.ListAPIView):
    """View for appreciation leaderboard"""
    
    serializer_class = AppreciationLeaderboardSerializer
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        """Build leaderboard"""
        # Get filters
        year = self.request.query_params.get('year')
        month = self.request.query_params.get('month')
        
        # Default to current month
        if not year or not month:
            now = timezone.now()
            year = now.year
            month = now.month
        else:
            year = int(year)
            month = int(month)
        
        # Get hospital from request user
        user = self.request.user
        if not user.hospital:
            return []
        
        # Get stats for the period
        stats = AppreciationStats.objects.filter(
            hospital=user.hospital,
            year=year,
            month=month,
            received_count__gt=0
        ).order_by('-received_count')
        
        # Build leaderboard
        leaderboard = []
        for rank, stat in enumerate(stats, start=1):
            recipient_name = stat.get_recipient_name()
            recipient_type = stat.recipient_content_type.model if stat.recipient_content_type else 'unknown'
            
            # Get badges for recipient
            badges = []
            user_badges = UserBadge.objects.filter(
                recipient_content_type=stat.recipient_content_type,
                recipient_object_id=stat.recipient_object_id
            ).select_related('badge')
            
            for user_badge in user_badges:
                badges.append({
                    'name': user_badge.badge.name_en,
                    'icon': user_badge.badge.icon,
                    'color': user_badge.badge.color,
                })
            
            leaderboard.append({
                'rank': rank,
                'recipient_type': recipient_type,
                'recipient_id': stat.recipient_object_id,
                'recipient_name': recipient_name,
                'hospital': stat.hospital.name,
                'department': stat.department.name if stat.department else None,
                'received_count': stat.received_count,
                'badges': badges,
            })
        
        return leaderboard