# -*- coding: utf-8 -*-

"""
@author: 猿小天
@contact: QQ:1638245306
@Created on: 2021/6/1 001 22:57
@Remark: 自定义视图集
"""
import uuid

from drf_yasg import openapi
from drf_yasg.utils import swagger_auto_schema
from rest_framework.decorators import action
from rest_framework.viewsets import ModelViewSet

from dvadmin.utils.filters import DataLevelPermissionsFilter
from dvadmin.utils.import_export_mixin import (
    ExportSerializerMixin,
    ImportSerializerMixin,
)
from dvadmin.utils.json_response import SuccessResponse, ErrorResponse, DetailResponse
from dvadmin.utils.permission import CustomPermission
from django_restql.mixins import QueryArgumentsMixin
from treebeard.models import Node


class CustomModelViewSet(
    ModelViewSet, ImportSerializerMixin, ExportSerializerMixin, QueryArgumentsMixin
):
    """
    自定义的ModelViewSet:
    统一标准的返回格式;新增,查询,修改可使用不同序列化器
    (1)ORM性能优化, 尽可能使用values_queryset形式
    (2)xxx_serializer_class 某个方法下使用的序列化器(xxx=create|update|list|retrieve|destroy)
    (3)filter_fields = '__all__' 默认支持全部model中的字段查询(除json字段外)
    (4)import_field_dict={} 导入时的字段字典 {model值: model的label}
    (5)export_field_label = [] 导出时的字段
    """

    values_queryset = None
    ordering_fields = "__all__"
    create_serializer_class = None
    update_serializer_class = None
    filter_fields = "__all__"
    search_fields = ()
    extra_filter_backends = [DataLevelPermissionsFilter]
    permission_classes = [CustomPermission]
    import_field_dict = {}
    export_field_label = []

    def filter_queryset(self, queryset):
        for backend in set(
            set(self.filter_backends) | set(self.extra_filter_backends or [])
        ):
            queryset = backend().filter_queryset(self.request, queryset, self)
        return queryset

    def get_queryset(self):
        if getattr(self, "values_queryset", None):
            return self.values_queryset
        return super().get_queryset()

    def get_serializer_class(self):
        action_serializer_name = f"{self.action}_serializer_class"
        action_serializer_class = getattr(self, action_serializer_name, None)
        if action_serializer_class:
            return action_serializer_class
        return super().get_serializer_class()

    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data, request=request)
        serializer.is_valid(raise_exception=True)
        if Node in self.queryset.model.__mro__:
            parent_id = request.data.get("parent")
            data = serializer.validated_data
            if parent_id is None:
                self.queryset.model.add_root(**data)
            else:
                parent = self.queryset.model.objects.filter(pk=parent_id).first()
                parent.add_child(**data)
            return DetailResponse(data=data, msg="新增成功")
        self.perform_create(serializer)
        return DetailResponse(data=serializer.data, msg="新增成功")

    def list(self, request, *args, **kwargs):
        queryset = self.filter_queryset(self.get_queryset())
        page = self.paginate_queryset(queryset)
        if page is not None:
            serializer = self.get_serializer(page, many=True, request=request)
            return self.get_paginated_response(serializer.data)
        serializer = self.get_serializer(queryset, many=True, request=request)
        return SuccessResponse(data=serializer.data, msg="获取成功")

    def retrieve(self, request, *args, **kwargs):
        instance = self.get_object()
        serializer = self.get_serializer(instance)
        return DetailResponse(data=serializer.data, msg="获取成功")

    def update(self, request, *args, **kwargs):
        partial = kwargs.pop("partial", False)
        instance = self.get_object()
        serializer = self.get_serializer(
            instance, data=request.data, request=request, partial=partial
        )
        serializer.is_valid(raise_exception=True)
        self.perform_update(serializer)

        if getattr(instance, "_prefetched_objects_cache", None):
            # If 'prefetch_related' has been applied to a queryset, we need to
            # forcibly invalidate the prefetch cache on the instance.
            instance._prefetched_objects_cache = {}
        return DetailResponse(data=serializer.data, msg="更新成功")

    def destroy(self, request, *args, **kwargs):
        instance = self.get_object()
        self.perform_destroy(instance)
        return DetailResponse(data=[], msg="删除成功")

    keys = openapi.Schema(
        description="主键列表", type=openapi.TYPE_ARRAY, items=openapi.TYPE_STRING
    )

    @swagger_auto_schema(
        request_body=openapi.Schema(
            type=openapi.TYPE_OBJECT, required=["keys"], properties={"keys": keys}
        ),
        operation_summary="批量删除",
    )
    @action(methods=["delete"], detail=False)
    def multiple_delete(self, request, *args, **kwargs):
        request_data = request.data
        keys = request_data.get("keys", None)
        if keys:
            self.get_queryset().filter(id__in=keys).delete()
            return SuccessResponse(data=[], msg="删除成功")
        else:
            return ErrorResponse(msg="未获取到keys字段")