import random
import string
from django.utils import timezone
from django.conf import settings
from django.db import models
from apps.tenant.building.models import Building
from apps.tenant.models import Tenant
from apps.tenant.option.models import Option
from apps.upload.models import Upload
from apps.tenant.repair_order.models import RepairOrder
from utils.exceptions import CustomError


class InspectionOrder(models.Model):
    NOT_REPAIR = 1
    HAS_REPAIR = 2
    REPAIR = 3
    STATUS_CHOICES = (
        (NOT_REPAIR, '巡检正常'),
        (HAS_REPAIR, '已报修'),
        (REPAIR, '已修复'),
    )

    building = models.ForeignKey(Building, verbose_name=u'巡检地点', on_delete=models.PROTECT)
    no = models.CharField(max_length=50, verbose_name=u'编号', blank=True)
    status = models.PositiveSmallIntegerField(choices=STATUS_CHOICES, verbose_name=u'状态', default=NOT_REPAIR)
    tenant = models.ForeignKey(Tenant, verbose_name=u'租户', on_delete=models.PROTECT, blank=True)
    user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name=u"巡检人员", on_delete=models.PROTECT,
                             editable=False, related_name='inspection_order_user')
    problem = models.CharField(max_length=500, verbose_name=u'巡检问题')
    create_time = models.DateTimeField(verbose_name=u'巡检时间', auto_now_add=True)
    images = models.ManyToManyField(Upload, verbose_name=u'图片', blank=True)
    repair_type = models.ForeignKey(Option, verbose_name=u'报修类型', on_delete=models.PROTECT, null=True)
    repair_order = models.ForeignKey(RepairOrder, verbose_name=u'转报修', on_delete=models.PROTECT, null=True)
    turn_repair_time = models.DateTimeField(verbose_name=u'转报修时间', null=True)
    turn_repair_user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name=u"转报修人", on_delete=models.PROTECT,
                                         null=True, related_name='turn_repair_user')

    class Meta:
        db_table = 'inspection_order'
        verbose_name = '巡检工单'
        ordering = ['-create_time']
        index_together = (
            'status',
            'create_time',
        )
        default_permissions = ()
        permissions = [
            ('browse_inspection_order', u'查看'),
            ('add_inspection_order', u'添加'),
            ('delete_inspection_order', u'删除'),
            ('dturn_repair_inspection_order', u'转报修'),
        ]

    @staticmethod
    def get_instance_by_id(id, tenant):
        try:
            id = int(id)
        except:
            raise CustomError('无效的inspection_order_id')
        instance = InspectionOrder.objects.filter(pk=id, tenant=tenant).first()
        if not instance:
            raise CustomError('未找到对应的巡检工单实例')
        return instance

    def get_no(self):
        now = timezone.now()
        no = '%s%d-%s' % ('XJ', self.tenant.id, now.strftime('%Y%m%d%H%M%S'))
        return no

    def turn_repair(self, user):
        # 巡检转报修
        repair_order = RepairOrder.objects.create(tenant=self.tenant, building=self.building,
                                                  fault_des=self.problem, repair_type=self.repair_type, user=self.user,
                                                  tel=self.user.employee.tel,name=self.user.employee.name,
                                                  order_type=RepairOrder.INSPECTION_ORDER)
        repair_order.no = repair_order.get_no()
        images = self.images.all()
        for image in images:
            repair_order.images.add(image.id)
        repair_order.save()

        self.status = InspectionOrder.HAS_REPAIR
        self.repair_order = repair_order
        self.turn_repair_time = timezone.now()
        self.turn_repair_user = user

        self.save()
        return repair_order