from django.shortcuts import render
from rest_framework.decorators import api_view, permission_classes
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from rest_framework import status
from api.models import Bhagat, Region, Notification
from channels.layers import get_channel_layer
from asgiref.sync import async_to_sync
import json


@api_view(['GET'])
@permission_classes([IsAuthenticated])
def get_users_by_filter(request):
    """
    Get users based on filter type: all, region, usertype, or search query
    Query params: 
    - type: all|region|usertype|search
    - value: region_id or usertype value or search query
    """
    filter_type = request.GET.get('type', 'all')
    filter_value = request.GET.get('value', '')
    
    try:
        if filter_type == 'all':
            users = Bhagat.objects.all().values('id', 'first_name', 'last_name', 'email', 'user_type', 'region__name')
        elif filter_type == 'region':
            users = Bhagat.objects.filter(region_id=filter_value).values('id', 'first_name', 'last_name', 'email', 'user_type', 'region__name')
        elif filter_type == 'usertype':
            users = Bhagat.objects.filter(user_type=filter_value).values('id', 'first_name', 'last_name', 'email', 'user_type', 'region__name')
        elif filter_type == 'search':
            users = Bhagat.objects.filter(
                first_name__icontains=filter_value
            ) | Bhagat.objects.filter(
                last_name__icontains=filter_value
            ) | Bhagat.objects.filter(
                email__icontains=filter_value
            )
            users = users.values('id', 'first_name', 'last_name', 'email', 'user_type', 'region__name')
        else:
            return Response({'error': 'Invalid filter type'}, status=status.HTTP_400_BAD_REQUEST)
        
        # Format user data
        user_list = [
            {
                'id': user['id'],
                'name': f"{user['first_name']} {user['last_name']}",
                'email': user['email'],
                'user_type': user['user_type'],
                'region': user['region__name']
            }
            for user in users
        ]
        
        return Response({'users': user_list}, status=status.HTTP_200_OK)
    except Exception as e:
        return Response({'error': str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)


@api_view(['GET'])
@permission_classes([IsAuthenticated])
def get_regions(request):
    """Get all regions"""
    try:
        regions = Region.objects.all().values('id', 'name')
        return Response({'regions': list(regions)}, status=status.HTTP_200_OK)
    except Exception as e:
        return Response({'error': str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)


@api_view(['POST'])
@permission_classes([IsAuthenticated])
def create_notification(request):
    """
    Create and send a notification
    Expected data:
    {
        "title": "Notification Title",
        "content": "Notification content",
        "notification_type": "orange",
        "delivery_type": "all|region|usertype|individualuser",
        "recipients": [user_ids] or region_id or usertype
    }
    """
    try:
        data = request.data
        title = data.get('title', '')
        content = data.get('content', '')
        notification_type = data.get('notification_type', 'orange')
        delivery_type = data.get('delivery_type', 'all')
        recipients_data = data.get('recipients', [])
        
        # Validation
        if not content:
            return Response({'error': 'Content is required'}, status=status.HTTP_400_BAD_REQUEST)
        
        # Create notification
        notification = Notification.objects.create(
            sender=request.user,
            title=title,
            content=content,
            notification_type=notification_type
        )
        
        # Determine recipients
        recipients = []
        if delivery_type == 'all':
            recipients = Bhagat.objects.all()
        elif delivery_type == 'region':
            region_id = recipients_data[0] if isinstance(recipients_data, list) else recipients_data
            recipients = Bhagat.objects.filter(region_id=region_id)
        elif delivery_type == 'usertype':
            user_type = recipients_data[0] if isinstance(recipients_data, list) else recipients_data
            recipients = Bhagat.objects.filter(user_type=user_type)
        elif delivery_type == 'individualuser':
            recipient_ids = [r if isinstance(r, int) else r.get('id') for r in recipients_data]
            recipients = Bhagat.objects.filter(id__in=recipient_ids)
        
        # Add recipients to notification
        notification.recipients.set(recipients)
        notification.save()
        
        # Send via WebSocket
        channel_layer = get_channel_layer()
        message_data = {
            'title': title,
            'content': content,
            'type': notification_type,
            'sender': f"{request.user.first_name} {request.user.last_name}",
            'timestamp': notification.timestamp.strftime('%Y-%m-%d %H:%M:%S')
        }
        
        async_to_sync(channel_layer.group_send)(
            'Yuvak',
            {
                'type': 'send_notification',
                'message': message_data
            }
        )
        
        return Response({
            'success': True,
            'message': 'Notification sent successfully',
            'notification': {
                'id': notification.id,
                'title': notification.title,
                'content': notification.content,
                'notification_type': notification.notification_type,
                'timestamp': notification.timestamp.strftime('%Y-%m-%d %H:%M:%S'),
                'recipients_count': notification.recipients.count()
            }
        }, status=status.HTTP_201_CREATED)
        
    except Exception as e:
        return Response({'error': str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)