from django.db.models import Max
from django.shortcuts import get_object_or_404
from rest_framework import status
from rest_framework.decorators import api_view, permission_classes
from rest_framework.pagination import PageNumberPagination
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from apps.common.serializers import AuthGroupSerializer
from apps.core.models import AuthGroup


@api_view(["GET"])
@permission_classes([IsAuthenticated])
def get_group_list(request):
    name = request.GET.get("name", None)
    page_size = request.GET.get("page_size", None)

    filter_kwargs = {}
    if name:
        filter_kwargs["name"] = name

    groups = AuthGroup.objects.filter(**filter_kwargs).order_by("name")

    paginator = PageNumberPagination()
    paginator.page_size = page_size or 10
    result_page = paginator.paginate_queryset(groups, request)

    serializer = AuthGroupSerializer(result_page, many=True)
    return paginator.get_paginated_response(serializer.data)


@api_view(["GET"])
@permission_classes([IsAuthenticated])
def read_group(request):
    group_id = request.GET.get("id", None)
    group = get_object_or_404(AuthGroup, id=group_id)
    serializer = AuthGroupSerializer(group)
    return Response(serializer.data)


@api_view(["POST"])
@permission_classes([IsAuthenticated])
def add_group(request):
    data = request.data
    max_id = AuthGroup.objects.aggregate(Max("id"))["id__max"]
    data["id"] = (max_id + 1) if max_id is not None else 1
    serializer = AuthGroupSerializer(data=data)

    if serializer.is_valid():
        serializer.save()
        return Response({"message": "Group added successfully"})

    return Response(
        {"error": "Invalid data", "details": serializer.errors},
        status=status.HTTP_400_BAD_REQUEST,
    )


@api_view(["PUT"])
@permission_classes([IsAuthenticated])
def update_group(request):
    data = request.data
    group = get_object_or_404(AuthGroup, id=data.get("id"))
    serializer = AuthGroupSerializer(instance=group, data=request.data, partial=True)

    if serializer.is_valid():
        serializer.save()
        return Response({"message": "Group updated successfully"})

    return Response(
        {"error": "Invalid data", "details": serializer.errors},
        status=status.HTTP_400_BAD_REQUEST,
    )


@api_view(["DELETE"])
@permission_classes([IsAuthenticated])
def delete_group(request):
    group_id = request.GET.get("id", None)
    group = get_object_or_404(AuthGroup, id=group_id)
    group.delete()
    return Response({"message": "Person deleted successfully"})