from rest_framework import viewsets, status
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework.permissions import IsAuthenticated
from drf_yasg.utils import swagger_auto_schema
from drf_yasg import openapi
from django.shortcuts import get_object_or_404
from django.http import JsonResponse
from django.core.cache import cache
import os
from rest_framework.decorators import action
from django.conf import settings

# Import all models, including UserAgent.
from .models import M3UAccount, M3UFilter, ServerGroup, M3UAccountProfile
from core.models import UserAgent
from apps.channels.models import ChannelGroupM3UAccount
from core.serializers import UserAgentSerializer
# Import all serializers, including the UserAgentSerializer.
from .serializers import (
    M3UAccountSerializer,
    M3UFilterSerializer,
    ServerGroupSerializer,
    M3UAccountProfileSerializer,
)

from .tasks import refresh_single_m3u_account, refresh_m3u_accounts
from django.core.files.storage import default_storage
from django.core.files.base import ContentFile

class M3UAccountViewSet(viewsets.ModelViewSet):
    """Handles CRUD operations for M3U accounts"""
    queryset = M3UAccount.objects.prefetch_related('channel_group')
    serializer_class = M3UAccountSerializer
    permission_classes = [IsAuthenticated]

    def create(self, request, *args, **kwargs):
        # Handle file upload first, if any
        file_path = None
        if 'file' in request.FILES:
            file = request.FILES['file']
            file_name = file.name
            file_path = os.path.join('/data/uploads/m3us', file_name)

            os.makedirs(os.path.dirname(file_path), exist_ok=True)
            with open(file_path, 'wb+') as destination:
                for chunk in file.chunks():
                    destination.write(chunk)

            # Add file_path to the request data so it's available during creation
            request.data._mutable = True  # Allow modification of the request data
            request.data['file_path'] = file_path  # Include the file path if a file was uploaded
            request.data.pop('server_url')
            request.data._mutable = False  # Make the request data immutable again

        # Now call super().create() to create the instance
        response = super().create(request, *args, **kwargs)

        # After the instance is created, return the response
        return response

    def update(self, request, *args, **kwargs):
        instance = self.get_object()

        # Handle file upload first, if any
        file_path = None
        if 'file' in request.FILES:
            file = request.FILES['file']
            file_name = file.name
            file_path = os.path.join('/data/uploads/m3us', file_name)

            os.makedirs(os.path.dirname(file_path), exist_ok=True)
            with open(file_path, 'wb+') as destination:
                for chunk in file.chunks():
                    destination.write(chunk)

            # Add file_path to the request data so it's available during creation
            request.data._mutable = True  # Allow modification of the request data
            request.data['file_path'] = file_path  # Include the file path if a file was uploaded
            request.data.pop('server_url')
            request.data._mutable = False  # Make the request data immutable again

            if instance.file_path and os.path.exists(instance.file_path):
                os.remove(instance.file_path)

        # Now call super().create() to create the instance
        response = super().update(request, *args, **kwargs)

        # After the instance is created, return the response
        return response

class M3UFilterViewSet(viewsets.ModelViewSet):
    """Handles CRUD operations for M3U filters"""
    queryset = M3UFilter.objects.all()
    serializer_class = M3UFilterSerializer
    permission_classes = [IsAuthenticated]

class ServerGroupViewSet(viewsets.ModelViewSet):
    """Handles CRUD operations for Server Groups"""
    queryset = ServerGroup.objects.all()
    serializer_class = ServerGroupSerializer
    permission_classes = [IsAuthenticated]

class RefreshM3UAPIView(APIView):
    """Triggers refresh for all active M3U accounts"""

    @swagger_auto_schema(
        operation_description="Triggers a refresh of all active M3U accounts",
        responses={202: "M3U refresh initiated"}
    )
    def post(self, request, format=None):
        refresh_m3u_accounts.delay()
        return Response({'success': True, 'message': 'M3U refresh initiated.'}, status=status.HTTP_202_ACCEPTED)

class RefreshSingleM3UAPIView(APIView):
    """Triggers refresh for a single M3U account"""

    @swagger_auto_schema(
        operation_description="Triggers a refresh of a single M3U account",
        responses={202: "M3U account refresh initiated"}
    )
    def post(self, request, account_id, format=None):
        refresh_single_m3u_account.delay(account_id)
        return Response({'success': True, 'message': f'M3U account {account_id} refresh initiated.'},
                        status=status.HTTP_202_ACCEPTED)

class UserAgentViewSet(viewsets.ModelViewSet):
    """Handles CRUD operations for User Agents"""
    queryset = UserAgent.objects.all()
    serializer_class = UserAgentSerializer
    permission_classes = [IsAuthenticated]

class M3UAccountProfileViewSet(viewsets.ModelViewSet):
    queryset = M3UAccountProfile.objects.all()
    serializer_class = M3UAccountProfileSerializer
    permission_classes = [IsAuthenticated]

    def get_queryset(self):
        m3u_account_id = self.kwargs['account_id']
        return M3UAccountProfile.objects.filter(m3u_account_id=m3u_account_id)

    def perform_create(self, serializer):
        # Get the account ID from the URL
        account_id = self.kwargs['account_id']

        # Get the M3UAccount instance for the account_id
        m3u_account = M3UAccount.objects.get(id=account_id)

        # Save the 'm3u_account' in the serializer context
        serializer.context['m3u_account'] = m3u_account

        # Perform the actual save
        serializer.save(m3u_account_id=m3u_account)