from django.db import IntegrityError
from django.db.models import F
from django.forms import model_to_dict
from django.contrib.auth.models import User
from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework.viewsets import ModelViewSet
from treeAndTable.models import Department, Dept_job, Job, Dept_job_user
from treeAndTable.serializer import Dept_Job_Serializer, DeptJobUserSerializer


class DepartmentView(APIView):
    def get(self, request):
        reqData = request.GET
        # 前端可以传0值也可没没有parent键
        parent = reqData.get('parent', '0')
        # 处理获取祖节点时数据库值为null的时候问题
        parentId = None if parent == '0' else parent
        if not parent.isdigit():
            return Response(data={}, status=status.HTTP_400_BAD_REQUEST)
        resData = Department.objects.filter(parent_id=parentId).annotate(has_leaf=F('rght') - F('lft') - 1).values('id',
                                                                                                                   'name',
                                                                                                                   'has_leaf',
                                                                                                                   'parent_id').all()
        for res in resData:
            res['has_leaf'] = res['has_leaf'] // 2 == 0
        return Response(data=resData, status=status.HTTP_200_OK)

    def post(self, request):
        reqData = request.data
        # 获取前端给的父类id获取父类
        parent = Department.objects.get(id=reqData['id'])
        # 对象类型转换成dict类型
        data = Department.objects.create(name=reqData['name'], parent=parent).__dict__
        # 不删除该属性会转换json错误
        data.pop('_state')
        return Response(data=data, status=status.HTTP_200_OK)

    def put(self, request):
        data = request.data
        parent = Department.objects.get(id=data['id'])
        parent.name = data['name']
        parent.save()
        d = parent.__dict__
        d.pop('_state')
        return Response(data=d, status=status.HTTP_200_OK)

    def delete(self, request):
        try:
            # 当传递的id值不存在数据库或没有传id值直接捕获异常
            data = Department.objects.get(id=request.GET.get('id')).delete()
        except Exception:
            return Response(data={}, status=status.HTTP_400_BAD_REQUEST)
        return Response(data=data, status=status.HTTP_200_OK)


'''
post
{
    "dept_id":"33",
    "name":"舍长"
}

delete
路由带上id

Put
{
    "dept":18,
    "job":6
}
'''


class DeptAndJobView(ModelViewSet):
    queryset = Dept_job.objects.all()
    serializer_class = Dept_Job_Serializer

    '''
    需要传递部门id和岗位名称
    '''

    def create(self, request):
        '''
        判断参数是否正确
        根据部门id和岗位名字创建对应岗位和对应的中间表数据
        :param request:
        :return:
        '''
        try:
            deptId = request.data['dept_id']
            name = request.data['name']
        except Exception:
            return Response(data={'msg': '请求参数错误'}, status=status.HTTP_400_BAD_REQUEST)
        try:
            # 如果给定的岗位名称不存在岗位表直接新建一个岗位
            job = Job.objects.get(name=name)
        except Exception:
            job = Job.objects.create(name=name)
        # 创建对应的中间表数据库
        Dept_job.objects.create(dept_id=deptId, job_id=job.id)

        return Response(data={'msg': 'success'}, status=status.HTTP_200_OK)

    '''
    根据部门id获取部门岗位中间表的该部门所有岗位信息
    返回中间表id和岗位name
    '''

    def list(self, request, *args, **kwargs):
        deptId = request.GET.get('dept_id')
        print(deptId)
        deptAndJob = Dept_job.objects.filter(dept_id=deptId).all()
        data = []
        for DJ in deptAndJob:
            data.append({
                'id': DJ.id,
                'name': DJ.job.name
            })
        return Response(data=data, status=status.HTTP_200_OK)


'''
部门岗位中间表与user建立的中间表
'''


class DeptJobUserView(ModelViewSet):
    queryset = Dept_job_user.objects.all()
    serializer_class = DeptJobUserSerializer

    '''
    仅支持list类型的部门岗位id集
    批量创建部门岗位的人员
    '''

    def create(self, request, *args, **kwargs):
        try:
            # 如果传入的部门必须包装成list
            deptJobId = request.data['dept_job_id']
            if not isinstance(deptJobId, list):
                raise Exception
            name = request.data['name']
        except Exception:
            return Response(data={'msg': '请求参数错误'}, status=status.HTTP_400_BAD_REQUEST)
        try:
            # 传入的用户名不能重复，如果没有当前用户就新建一个
            user = User.objects.get(username=name)
        except Exception:
            user = User.objects.create_user(username=name, password='2020txts')
        # 批量创建
        listinsert = list()
        for id in deptJobId:
            listinsert.append(Dept_job_user(dept_job_id=id, user_id=user.id))
        try:
            Dept_job_user.objects.bulk_create(listinsert)
        except IntegrityError:
            return Response(data={'msg': '数据已经存在,不要添加重复数据'}, status=status.HTTP_400_BAD_REQUEST)
        return Response(data={'msg': 'success'}, status=status.HTTP_200_OK)

    '''
    返回的数据案例
    [
        {
            "id": 14,
            "user_id": 3,
            "user_name": "zangsan",
            "jobs": [
                {
                    "job_id": 4,
                    "job_name": "测试岗位"
                },
                {
                    "job_id": 6,
                    "user_name": "测试岗位1"
                }
            ]
        }
    ]
    根据部门id获取部门下的所有人员和人员所分配到的岗位信息
    '''

    def list(self, request, *args, **kwargs):
        deptAndJob = Dept_job.objects.filter(dept_id=request.GET.get('dept_id', -1)).all().values()
        # 使用列表生成器生成该部门的所有岗位id数组查询所有人员
        deptAndJobAndUser = Dept_job_user.objects.filter(dept_job_id__in=[DJ['id'] for DJ in deptAndJob]).all()
        # 返回前端的数据集
        data = {}
        # 部门岗位人员中间表的数据集
        for DJU in deptAndJobAndUser:
            # 如果该用户有多个岗位
            if DJU.user.id in data:
                data[DJU.user.id]['jobs'].append({'job_id': DJU.dept_job.job.id, 'job_name': DJU.dept_job.job.name})
            else:
                # 第一次包装用户的岗位信息
                data[DJU.user.id] = {
                    'id': DJU.id,
                    'user_id': DJU.user.id,
                    'user_name': DJU.user.username,
                    'jobs': [
                        {
                            'job_id': DJU.dept_job.job.id,
                            'job_name': DJU.dept_job.job.name,
                        }
                    ]
                }
        # 前端table不接收有id的object,需转换成list
        data = [i for i in data.values()]
        return Response(data=data, status=status.HTTP_200_OK)