from adrf.views import APIView
from rest_framework.response import Response
from rest_framework import status
from django.db.models import Q
from asgiref.sync import sync_to_async
from ..models import Blacklist, FUser
from ..serializers.user_serializers import BlacklistSerializer
from utils.response_codes import (
    ResponseCode,
    create_standardized_response,
    create_standardized_error_response
)
from drf_yasg.utils import swagger_auto_schema
from drf_yasg import openapi
from chunyu_project.common_schemas import success_response, error_response, unauthorized_response, not_found_response


class BlacklistListAPIView(APIView):
    @swagger_auto_schema(
        tags=['黑名单'],
        operation_summary='获取黑名单列表',
        operation_description='获取当前用户的黑名单列表，支持搜索和分页',
        manual_parameters=[
            openapi.Parameter('search', openapi.IN_QUERY, description='搜索关键词', type=openapi.TYPE_STRING),
            openapi.Parameter('page', openapi.IN_QUERY, description='页码', type=openapi.TYPE_INTEGER),
            openapi.Parameter('page_size', openapi.IN_QUERY, description='每页数量', type=openapi.TYPE_INTEGER),
        ],
        responses={200: success_response, 401: unauthorized_response},
    )
    async def get(self, request):
        queryset = Blacklist.objects.filter(user=request.user).select_related('blocked_user')

        search = request.query_params.get('search', '')
        if search:
            queryset = queryset.filter(
                Q(blocked_user__username__icontains=search) |
                Q(blocked_user__email__icontains=search) |
                Q(reason__icontains=search)
            )

        page = int(request.query_params.get('page', 1))
        page_size = int(request.query_params.get('page_size', 10))
        total = await queryset.acount()
        start = (page - 1) * page_size
        end = start + page_size

        items = [item async for item in queryset[start:end]]
        serializer = BlacklistSerializer(items, many=True)

        return create_standardized_response(
            data={
                'results': await serializer.adata,
                'total': total,
                'page': page,
                'page_size': page_size,
                'total_pages': (total + page_size - 1) // page_size
            },
            code=ResponseCode.SUCCESS,
            status_code=status.HTTP_200_OK
        )


class BlacklistAddAPIView(APIView):
    @swagger_auto_schema(
        tags=['黑名单'],
        operation_summary='添加黑名单',
        operation_description='将指定用户添加到黑名单',
        request_body=BlacklistSerializer,
        responses={201: success_response, 400: error_response, 401: unauthorized_response},
    )
    async def post(self, request):
        serializer = BlacklistSerializer(
            data=request.data,
            context={'request': request}
        )

        # 校验器内部含同步 ORM 查询（validate_blocked_user_id / validate），线程池兜底
        if not await sync_to_async(serializer.is_valid)():
            errors = serializer.errors
            first_error = ''
            for field, msgs in errors.items():
                if isinstance(msgs, list) and msgs:
                    first_error = str(msgs[0])
                    break

            return create_standardized_error_response(
                data=errors,
                code=ResponseCode.PARAMETER_ERROR,
                message=first_error or '参数异常',
                status_code=status.HTTP_400_BAD_REQUEST
            )

        blacklist = await serializer.asave()
        result_serializer = BlacklistSerializer(blacklist)

        return create_standardized_response(
            data=await result_serializer.adata,
            code=ResponseCode.SUCCESS,
            status_code=status.HTTP_201_CREATED
        )


class BlacklistCheckAPIView(APIView):
    @swagger_auto_schema(
        tags=['黑名单'],
        operation_summary='检查用户是否在黑名单中',
        operation_description='检查指定用户是否被当前用户加入黑名单',
        manual_parameters=[
            openapi.Parameter('user_id', openapi.IN_PATH, description='用户ID', type=openapi.TYPE_INTEGER),
        ],
        responses={200: success_response, 401: unauthorized_response},
    )
    async def get(self, request, user_id):
        is_blocked = await Blacklist.objects.filter(
            user=request.user,
            blocked_user_id=user_id
        ).aexists()
        return create_standardized_response(
            data={'is_blocked': is_blocked},
            code=ResponseCode.SUCCESS,
            status_code=status.HTTP_200_OK
        )


class BlacklistRemoveAPIView(APIView):
    @swagger_auto_schema(
        tags=['黑名单'],
        operation_summary='移除黑名单',
        operation_description='将指定用户从黑名单中移除',
        manual_parameters=[
            openapi.Parameter('pk', openapi.IN_PATH, description='黑名单记录ID', type=openapi.TYPE_INTEGER),
        ],
        responses={200: success_response, 401: unauthorized_response, 404: not_found_response},
    )
    async def delete(self, request, pk):
        try:
            blacklist = await Blacklist.objects.aget(id=pk, user=request.user)
        except Blacklist.DoesNotExist:
            return create_standardized_error_response(
                code=ResponseCode.NOT_FOUND,
                message='黑名单记录不存在',
                status_code=status.HTTP_404_NOT_FOUND
            )

        await blacklist.adelete()

        return create_standardized_response(
            data={'deleted': True},
            code=ResponseCode.SUCCESS,
            status_code=status.HTTP_200_OK
        )