from django.contrib.auth import get_user_model
from django.test import TestCase
from rest_framework import status
from rest_framework.test import APIClient

from basic_info.models import Merchant, MerchantTypeEnum, Customer
from printing import models as printing_models


class PrintCountDeltaAPITestCase(TestCase):
    """打印次数增量接口测试"""

    url = '/api/v1/print-count/delta/'

    def setUp(self):
        self.client = APIClient()
        self.user = get_user_model().objects.create_user(username='tester', password='test123')
        self.client.force_authenticate(self.user)

        self.merchant = Merchant.objects.create(name='测试商户', type=MerchantTypeEnum.FACTORY)
        self.customer = Customer.objects.create(
            merchant=self.merchant,
            name='客户甲',
            mobile='13900000000',
            created_by=None,
        )

        self.printing_order = printing_models.PrintingOrder.objects.create(
            customer=self.customer,
            fabric='棉布',
            width='150cm',
        )
        self.plate_order = printing_models.PlateOrder.objects.create(
            customer=self.customer,
            design_code='DES-001',
        )

    def test_increment_printing_order_with_delta(self):
        response = self.client.post(
            self.url,
            {
                'object_type': 'printing_order',
                'object_id': self.printing_order.id,
                'delta': 3,
            },
            format='json',
        )
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.printing_order.refresh_from_db()
        self.assertEqual(self.printing_order.print_count, 3)
        self.assertEqual(response.data['print_count'], 3)
        self.assertEqual(response.data['delta'], 3)

    def test_delta_defaults_to_one_when_invalid(self):
        response = self.client.post(
            self.url,
            {
                'object_type': 'plate_order',
                'object_id': self.plate_order.id,
                'delta': 'invalid',
            },
            format='json',
        )
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.plate_order.refresh_from_db()
        self.assertEqual(self.plate_order.print_count, 1)
        self.assertEqual(response.data['delta'], 1)

    def test_invalid_object_type_returns_400(self):
        response = self.client.post(
            self.url,
            {
                'object_type': 'unknown_type',
                'object_id': self.printing_order.id,
            },
            format='json',
        )
        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
        self.assertIn('object_type', response.data)

    def test_not_found_returns_404(self):
        response = self.client.post(
            self.url,
            {
                'object_type': 'printing_order',
                'object_id': 999999,
            },
            format='json',
        )
        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)