import json
from pathlib import Path

from django.conf import settings
from django.core.files.uploadedfile import SimpleUploadedFile
from django.test import TestCase, override_settings
from django.urls import reverse

from menu.models import Dish, DishCategory, Order


TEST_MEDIA_ROOT = Path(settings.BASE_DIR) / 'test_media'


@override_settings(MEDIA_ROOT=TEST_MEDIA_ROOT)
class UploadImageTests(TestCase):
    def tearDown(self):
        if TEST_MEDIA_ROOT.exists():
            for path in sorted(TEST_MEDIA_ROOT.rglob('*'), reverse=True):
                if path.is_file():
                    path.unlink()
                elif path.is_dir():
                    path.rmdir()

    def test_upload_rejects_invalid_extension(self):
        image = SimpleUploadedFile('bad.txt', b'file-content', content_type='image/png')

        response = self.client.post(reverse('upload'), {'image': image})

        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()['error'], 'Unsupported image extension')

    def test_upload_rejects_invalid_content_type(self):
        image = SimpleUploadedFile('dish.png', b'file-content', content_type='text/plain')

        response = self.client.post(reverse('upload'), {'image': image})

        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()['error'], 'Unsupported image content type')

    @override_settings(MAX_UPLOAD_IMAGE_SIZE=4)
    def test_upload_rejects_oversized_file(self):
        image = SimpleUploadedFile('dish.png', b'12345', content_type='image/png')

        response = self.client.post(reverse('upload'), {'image': image})

        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()['error'], 'Image file too large')

    def test_upload_returns_absolute_media_url(self):
        image = SimpleUploadedFile('dish.png', b'png-bytes', content_type='image/png')

        response = self.client.post(reverse('upload'), {'image': image}, secure=True)

        self.assertEqual(response.status_code, 200)
        data = response.json()
        self.assertTrue(data['url'].startswith('https://testserver/media/dishes/'))


class ParseUrlTests(TestCase):
    def test_parse_url_rejects_non_allowlisted_host(self):
        response = self.client.post(
            '/api/parse-url/',
            data=json.dumps({'url': 'http://127.0.0.1/internal'}),
            content_type='application/json',
        )

        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json()['error'], '该站点不在允许的解析范围内')


class OrderApiTests(TestCase):
    def setUp(self):
        category = DishCategory.objects.create(name='热菜')
        self.dish1 = Dish.objects.create(name='宫保鸡丁', category=category, ingredients=[{'name': '鸡肉', 'amount': '300g'}])
        self.dish2 = Dish.objects.create(name='鱼香肉丝', category=category, ingredients=[{'name': '猪肉', 'amount': '200g'}])

    def test_create_order_binds_dish_ids_and_returns_saved_object(self):
        payload = {
            'name': '周末聚会',
            'dish_ids': [self.dish1.id, self.dish2.id],
            'participants': ['张三', '李四'],
            'party_date': '2026-03-10T12:30:00Z',
        }

        response = self.client.post('/api/orders/', payload, content_type='application/json')

        self.assertEqual(response.status_code, 201)
        data = response.json()
        self.assertEqual(data['name'], '周末聚会')
        self.assertEqual(sorted(d['id'] for d in data['dishes_detail']), sorted([self.dish1.id, self.dish2.id]))
        self.assertEqual(data['participants'], ['张三', '李四'])

        order = Order.objects.get(pk=data['id'])
        self.assertEqual(order.dishes.count(), 2)
        self.assertEqual(sorted(order.dishes.values_list('id', flat=True)), sorted([self.dish1.id, self.dish2.id]))