import json

from django.db import IntegrityError
from django.shortcuts import render
from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import APIView
from mptt_test.models import Genre  # 模型
from django.forms.models import model_to_dict


# Create your views here.
# 插入
class mpttView(APIView):
    """
    request {name名字},parent_id{父级id，可空}
    创建一个节点
    """

    def post(self, request):
        data = request.data
        res = []
        if 'parent_id' in data:
            try:
                res = Genre.objects.create(
                    name=data['name'],
                    parent=Genre.objects.get(id=data['parent_id'])
                )
                res = {'node': model_to_dict(res), 'message': data['name'] + ' 新增叶子成功'}
                return Response(data=res, status=status.HTTP_200_OK)
            except Exception:
                return Response(data={"message": '错误'}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

        else:
            try:
                res = Genre.objects.create(
                    name=data['name'],
                )
                res = {'node': model_to_dict(res), 'message': data['name'] + ' 新增父级成功'}
                return Response(data=res, status=status.HTTP_200_OK)
            except Exception:
                return Response(data={"message": '错误'}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

    """
    得到节点
    request{parent_id(节点id，可空)}
    """

    def get(self, request):
        data = request.GET
        res = []
        if 'parent_id' in data:
            # 给parent_id 拿到子集
            res = Genre.objects.filter(parent_id=data['parent_id']).values().all()
        else:
            # 没有传name 则给第0层
            res = Genre.objects.filter(parent_id=None).values().all()
        return Response(data=res, status=status.HTTP_200_OK)

    """
    删除节点
    {id:节点id}
    """

    def delete(self, request):
        data = request.data
        res = Genre.objects.filter(id=data['id']).delete()
        return Response(data="删除成功", status=status.HTTP_200_OK)

    """
    更新节点
    {id:节点id,name:节点名字,parent_id:父节点id(可空)}
    """

    def put(self, request):
        data = request.data
        if 'parent_id' in data:
            res = Genre.objects.filter(id=data['id']).update(name=data['name'], parent_id=data['parent_id'])
        else:
            res = Genre.objects.filter(id=data['id']).update(name=data['name'])

        return Response(data=res, status=status.HTTP_200_OK)