"""
AI Engine API views
"""
import time

from django.db.models import Q
from drf_spectacular.utils import extend_schema, extend_schema_view
from rest_framework import status, viewsets
from rest_framework.decorators import action, api_view, permission_classes
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from apps.accounts.permissions import IsPXAdmin, IsHospitalAdmin

from .models import SentimentResult
from .serializers import (
    AnalyzeTextRequestSerializer,
    AnalyzeTextResponseSerializer,
    BatchAnalyzeRequestSerializer,
    BatchAnalyzeResponseSerializer,
    SentimentResultSerializer,
    SentimentStatsSerializer,
)
from .services import AIEngineService


@extend_schema_view(
    list=extend_schema(
        summary="List sentiment results",
        description="Get a list of all sentiment analysis results with filtering options"
    ),
    retrieve=extend_schema(
        summary="Get sentiment result",
        description="Get details of a specific sentiment analysis result"
    ),
)
class SentimentResultViewSet(viewsets.ReadOnlyModelViewSet):
    """
    Sentiment result viewset - Read-only API for sentiment results.
    
    Provides:
    - List all sentiment results with filters
    - Retrieve specific sentiment result
    - Statistics endpoint
    """
    serializer_class = SentimentResultSerializer
    permission_classes = [IsAuthenticated]
    filterset_fields = ['sentiment', 'language', 'ai_service']
    search_fields = ['text']
    ordering_fields = ['created_at', 'sentiment_score', 'confidence']
    ordering = ['-created_at']
    
    def get_queryset(self):
        """Filter queryset based on user permissions"""
        queryset = SentimentResult.objects.select_related('content_type').all()
        
        # Apply filters from query params
        sentiment = self.request.query_params.get('sentiment')
        if sentiment:
            queryset = queryset.filter(sentiment=sentiment)
        
        language = self.request.query_params.get('language')
        if language:
            queryset = queryset.filter(language=language)
        
        ai_service = self.request.query_params.get('ai_service')
        if ai_service:
            queryset = queryset.filter(ai_service=ai_service)
        
        min_confidence = self.request.query_params.get('min_confidence')
        if min_confidence:
            queryset = queryset.filter(confidence__gte=min_confidence)
        
        search = self.request.query_params.get('search')
        if search:
            queryset = queryset.filter(text__icontains=search)
        
        return queryset
    
    @extend_schema(
        summary="Get sentiment statistics",
        description="Get aggregated statistics for sentiment results",
        responses={200: SentimentStatsSerializer}
    )
    @action(detail=False, methods=['get'])
    def stats(self, request):
        """Get sentiment statistics"""
        queryset = self.get_queryset()
        stats = AIEngineService.get_sentiment_stats(queryset)
        serializer = SentimentStatsSerializer(stats)
        return Response(serializer.data)


@extend_schema(
    summary="Analyze text",
    description="Analyze text for sentiment, keywords, entities, and emotions",
    request=AnalyzeTextRequestSerializer,
    responses={200: AnalyzeTextResponseSerializer}
)
@api_view(['POST'])
@permission_classes([IsAuthenticated])
def analyze_text(request):
    """
    Analyze text for sentiment.
    
    POST /api/ai-engine/analyze/
    
    Request body:
    {
        "text": "The service was excellent!",
        "language": "en",  // optional, auto-detected if not provided
        "extract_keywords": true,
        "extract_entities": true,
        "detect_emotions": true
    }
    
    Response:
    {
        "text": "The service was excellent!",
        "language": "en",
        "sentiment": "positive",
        "sentiment_score": 0.8,
        "confidence": 0.9,
        "keywords": ["excellent"],
        "entities": [],
        "emotions": {"joy": 0.6},
        "ai_service": "stub",
        "ai_model": "keyword_matching_v1",
        "processing_time_ms": 5
    }
    """
    serializer = AnalyzeTextRequestSerializer(data=request.data)
    
    if not serializer.is_valid():
        return Response(
            serializer.errors,
            status=status.HTTP_400_BAD_REQUEST
        )
    
    # Perform analysis
    result = AIEngineService.sentiment.analyze_text(
        text=serializer.validated_data['text'],
        language=serializer.validated_data.get('language'),
        extract_keywords=serializer.validated_data.get('extract_keywords', True),
        extract_entities=serializer.validated_data.get('extract_entities', True),
        detect_emotions=serializer.validated_data.get('detect_emotions', True),
    )
    
    response_serializer = AnalyzeTextResponseSerializer(result)
    return Response(response_serializer.data)


@extend_schema(
    summary="Analyze batch of texts",
    description="Analyze multiple texts in a single request",
    request=BatchAnalyzeRequestSerializer,
    responses={200: BatchAnalyzeResponseSerializer}
)
@api_view(['POST'])
@permission_classes([IsAuthenticated])
def analyze_batch(request):
    """
    Analyze multiple texts in batch.
    
    POST /api/ai-engine/analyze-batch/
    
    Request body:
    {
        "texts": [
            "The service was excellent!",
            "Very disappointed with the wait time.",
            "Average experience overall."
        ],
        "language": "en"  // optional
    }
    
    Response:
    {
        "results": [
            {
                "text": "The service was excellent!",
                "sentiment": "positive",
                ...
            },
            ...
        ],
        "total": 3,
        "processing_time_ms": 15
    }
    """
    serializer = BatchAnalyzeRequestSerializer(data=request.data)
    
    if not serializer.is_valid():
        return Response(
            serializer.errors,
            status=status.HTTP_400_BAD_REQUEST
        )
    
    start_time = time.time()
    
    # Perform batch analysis
    results = AIEngineService.sentiment.analyze_batch(
        texts=serializer.validated_data['texts'],
        language=serializer.validated_data.get('language'),
    )
    
    processing_time_ms = int((time.time() - start_time) * 1000)
    
    response_data = {
        'results': results,
        'total': len(results),
        'processing_time_ms': processing_time_ms,
    }
    
    response_serializer = BatchAnalyzeResponseSerializer(response_data)
    return Response(response_serializer.data)


@extend_schema(
    summary="Get sentiment for object",
    description="Get sentiment analysis result for a specific object",
    responses={200: SentimentResultSerializer}
)
@api_view(['GET'])
@permission_classes([IsAuthenticated])
def get_sentiment_for_object(request, content_type_id, object_id):
    """
    Get sentiment result for a specific object.
    
    GET /api/ai-engine/sentiment/{content_type_id}/{object_id}/
    """
    from django.contrib.contenttypes.models import ContentType
    
    try:
        content_type = ContentType.objects.get(id=content_type_id)
    except ContentType.DoesNotExist:
        return Response(
            {'error': 'Content type not found'},
            status=status.HTTP_404_NOT_FOUND
        )
    
    sentiment_result = SentimentResult.objects.filter(
        content_type=content_type,
        object_id=object_id
    ).first()
    
    if not sentiment_result:
        return Response(
            {'error': 'Sentiment result not found'},
            status=status.HTTP_404_NOT_FOUND
        )
    
    serializer = SentimentResultSerializer(sentiment_result)
    return Response(serializer.data)