from rest_framework.generics import ListAPIView, GenericAPIView
from rest_framework.permissions import AllowAny
from rest_framework.response import Response
from rest_framework import status
from rest_framework.permissions import IsAuthenticated
from django.db.models import Q
from django.shortcuts import get_object_or_404
from .models import Blog
from .serializers import BlogListSerializer, BlogDetailSerializer
import random
from drf_yasg.utils import swagger_auto_schema
from drf_yasg import openapi


class BlogListAPIView(ListAPIView):
    """
    API view to list blogs with search and sort_by filters
    """
    serializer_class = BlogListSerializer
    permission_classes = [AllowAny]
    
    @swagger_auto_schema(
        operation_description="List blogs with optional search and sort_by filters",
        tags=["Imam-Javad - Blog"],
        manual_parameters=[
            openapi.Parameter(
                name='search',
                in_=openapi.IN_QUERY,
                description='Search in title, slogan, or summary',
                type=openapi.TYPE_STRING,
                required=False
            ),
            openapi.Parameter(
                name='sort_by',
                in_=openapi.IN_QUERY,
                description="Sorting: 'latest' or 'most_viewed'",
                type=openapi.TYPE_STRING,
                required=False
            ),
        ],
        responses={
            200: openapi.Response(
                description="List of blogs",
                schema=BlogListSerializer(many=True)
            )
        }
    )
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **kwargs)

    def get_queryset(self):
        queryset = Blog.objects.all()
        
        # Search filter
        search = self.request.query_params.get('search', None)
        if search:
            queryset = queryset.filter(
                Q(title__icontains=search) | 
                Q(slogan__icontains=search) | 
                Q(summary__icontains=search)
            )
        
        # Sort by filter
        sort_by = self.request.query_params.get('sort_by', None)
        if sort_by == 'latest':
            queryset = queryset.order_by('-created_at')
        elif sort_by == 'most_viewed':
            queryset = queryset.order_by('-views_count')
        else:
            # Default ordering
            queryset = queryset.order_by('-created_at')
        
        return queryset


class RelatedBlogsAPIView(GenericAPIView):
    """
    API view to get 10 random related blogs for a given blog ID
    """
    serializer_class = BlogListSerializer
    permission_classes = [AllowAny]
    
    @swagger_auto_schema(
        operation_description="Get up to 10 random related blogs for the given blog_id",
        tags=["Imam-Javad - Blog"],
        manual_parameters=[
            openapi.Parameter(
                name='blog_id',
                in_=openapi.IN_PATH,
                description='Current blog ID to exclude',
                type=openapi.TYPE_INTEGER,
                required=True
            )
        ],
        responses={
            200: openapi.Response(
                description="Related blogs",
                schema=BlogListSerializer(many=True)
            )
        }
    )
    def get(self, request, blog_id):
        """
        Get 10 random blogs excluding the current blog
        """
        try:
            # Get the current blog to exclude it from results
            current_blog = get_object_or_404(Blog, id=blog_id)
            
            # Get all blogs except the current one
            all_blogs = list(Blog.objects.exclude(id=blog_id))
            
            # Get random 10 blogs (or less if there are fewer blogs)
            random_count = min(10, len(all_blogs))
            if random_count > 0:
                related_blogs = random.sample(all_blogs, random_count)
            else:
                related_blogs = []
            
            serializer = self.get_serializer(related_blogs, many=True)
            return Response(serializer.data, status=status.HTTP_200_OK)
            
        except Exception as e:
            return Response(
                {'error': 'Blog not found or error occurred'}, 
                status=status.HTTP_404_NOT_FOUND
            )


class BlogDetailBySlugAPIView(GenericAPIView):
    """
    API view to get blog details by slug and increment view count
    """
    serializer_class = BlogDetailSerializer
    permission_classes = [AllowAny]
    
    @swagger_auto_schema(
        operation_description="Get blog details by slug and increment view count",
        tags=["Imam-Javad - Blog"],
        manual_parameters=[
            openapi.Parameter(
                name='slug',
                in_=openapi.IN_PATH,
                description='Blog slug',
                type=openapi.TYPE_STRING,
                required=True
            )
        ],
        responses={
            200: openapi.Response(
                description="Blog detail",
                schema=BlogDetailSerializer()
            )
        }
    )
    def get(self, request, slug):
        """
        Get blog details by slug and increment view count
        """
        try:
            # Slug is stored as list of objects in JSONField -> filter accordingly
            blog = Blog.objects.filter(slug__contains=[{'title': slug}]).first()
            if not blog:
                return Response({'error': 'Blog not found'}, status=status.HTTP_404_NOT_FOUND)
            
            # Increment view count
            blog.increment_view_count()
            
            # Get related blog contents ordered by order field
            blog_with_contents = Blog.objects.prefetch_related(
                'contents'
            ).get(id=blog.id)
            
            serializer = self.get_serializer(blog_with_contents, context={'request': request})
            return Response(serializer.data, status=status.HTTP_200_OK)
            
        except Exception as e:
            return Response(
                {'error': 'Blog not found'}, 
                status=status.HTTP_404_NOT_FOUND
            )