import 'package:dio/dio.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:http_mock_adapter/http_mock_adapter.dart';
import 'package:jiu_client/core/api/api_client.dart';
import 'package:jiu_client/core/exceptions.dart';
import 'package:jiu_client/repositories/product_repository.dart';

const _baseUrl = 'http://localhost:8080/api/v1';

ApiClient _buildClient(Dio dio) {
  // We inject the Dio directly by creating ApiClient and swapping it out
  // via a subclass-free approach: wrap with a test double.
  return _TestApiClient(dio);
}

/// A thin ApiClient subclass that delegates to an injected Dio.
class _TestApiClient extends ApiClient {
  final Dio _testDio;

  _TestApiClient(this._testDio) : super(token: 'test-token');

  @override
  Future<Response> get(String path, {Map<String, dynamic>? params}) =>
      _testDio.get(path, queryParameters: params);

  @override
  Future<Response> post(String path, {dynamic data}) =>
      _testDio.post(path, data: data);

  @override
  Future<Response> put(String path, {dynamic data}) =>
      _testDio.put(path, data: data);

  @override
  Future<Response> delete(String path) => _testDio.delete(path);
}

void main() {
  late Dio dio;
  late DioAdapter adapter;
  late ProductRepository repo;

  setUp(() {
    dio = Dio(BaseOptions(baseUrl: _baseUrl));
    adapter = DioAdapter(dio: dio, matcher: const FullHttpRequestMatcher());
    repo = ProductRepository(_buildClient(dio));
  });

  // ---------------------------------------------------------------------------
  // list()
  // ---------------------------------------------------------------------------
  group('ProductRepository.list()', () {
    test('returns PageResult with products on 200', () async {
      adapter.onGet(
        '/products',
        (server) => server.reply(200, {
          'data': [
            {
              'id': 1,
              'code': 'P001',
              'name': '五粮液',
              'unit': '瓶',
              'barcode': null,
              'series': null,
              'spec': '500ml',
              'category_id': null,
              'brand': '五粮液集团',
              'purchase_price': 500.0,
              'sale_price': 680.0,
              'min_stock': 10,
              'remark': null,
              'custom_fields': null,
            }
          ],
          'total': 1,
          'page': 1,
          'page_size': 20,
        }),
        queryParameters: {'page': 1, 'page_size': 20},
      );

      final result = await repo.list();

      expect(result.total, 1);
      expect(result.data.length, 1);
      expect(result.data.first.name, '五粮液');
      expect(result.data.first.code, 'P001');
      expect(result.data.first.purchasePrice, 500.0);
    });

    test('returns empty list without error when data array is empty', () async {
      adapter.onGet(
        '/products',
        (server) => server.reply(200, {
          'data': [],
          'total': 0,
          'page': 1,
          'page_size': 20,
        }),
        queryParameters: {'page': 1, 'page_size': 20},
      );

      final result = await repo.list();

      expect(result.data, isEmpty);
      expect(result.total, 0);
    });

    test('passes keyword query param when provided', () async {
      adapter.onGet(
        '/products',
        (server) => server.reply(200, {
          'data': [],
          'total': 0,
          'page': 1,
          'page_size': 20,
        }),
        queryParameters: {
          'page': 1,
          'page_size': 20,
          'keyword': '茅台',
        },
      );

      final result = await repo.list(keyword: '茅台');
      expect(result.data, isEmpty);
    });

    test('400 response throws AppException with server error message', () async {
      adapter.onGet(
        '/products',
        (server) => server.reply(400, {'error': 'invalid page parameter'}),
        queryParameters: {'page': 1, 'page_size': 20},
      );

      expect(
        () => repo.list(),
        throwsA(
          predicate<AppException>(
            (e) =>
                e is AppException &&
                e.message == 'invalid page parameter' &&
                e.statusCode == 400,
          ),
        ),
      );
    });

    test('401 response throws AppException with status 401', () async {
      adapter.onGet(
        '/products',
        (server) => server.reply(401, {'error': 'unauthorized'}),
        queryParameters: {'page': 1, 'page_size': 20},
      );

      expect(
        () => repo.list(),
        throwsA(
          predicate<AppException>(
            (e) => e is AppException && e.statusCode == 401,
          ),
        ),
      );
    });

    test('network timeout throws AppException with fallback message', () async {
      final badDio = Dio(BaseOptions(
        baseUrl: 'http://localhost:19999',
        connectTimeout: const Duration(milliseconds: 100),
      ));
      final badRepo = ProductRepository(_buildClient(badDio));

      try {
        await badRepo.list();
        fail('Expected AppException');
      } on AppException catch (e) {
        expect(e.message, isNotEmpty);
      }
    });
  });

  // ---------------------------------------------------------------------------
  // create()
  // ---------------------------------------------------------------------------
  group('ProductRepository.create()', () {
    test('returns created Product on 201', () async {
      final payload = {'name': '茅台', 'code': 'MT001', 'unit': '瓶'};
      adapter.onPost(
        '/products',
        (server) => server.reply(201, {
          'data': {
            'id': 2,
            'code': 'MT001',
            'name': '茅台',
            'unit': '瓶',
            'barcode': null,
            'series': null,
            'spec': null,
            'category_id': null,
            'brand': null,
            'purchase_price': null,
            'sale_price': null,
            'min_stock': null,
            'remark': null,
            'custom_fields': null,
          }
        }),
        data: payload,
      );

      final product = await repo.create(payload);

      expect(product.id, 2);
      expect(product.name, '茅台');
      expect(product.code, 'MT001');
    });

    test('400 response throws AppException', () async {
      adapter.onPost(
        '/products',
        (server) => server.reply(400, {'error': 'code already exists'}),
        data: {'name': '茅台', 'code': 'MT001', 'unit': '瓶'},
      );

      expect(
        () => repo.create({'name': '茅台', 'code': 'MT001', 'unit': '瓶'}),
        throwsA(
          predicate<AppException>(
            (e) => e.message == 'code already exists' && e.statusCode == 400,
          ),
        ),
      );
    });
  });

  // ---------------------------------------------------------------------------
  // update()
  // ---------------------------------------------------------------------------
  group('ProductRepository.update()', () {
    test('returns updated Product on 200', () async {
      final payload = {'name': '茅台(升级)', 'code': 'MT001', 'unit': '瓶'};
      adapter.onPut(
        '/products/2',
        (server) => server.reply(200, {
          'data': {
            'id': 2,
            'code': 'MT001',
            'name': '茅台(升级)',
            'unit': '瓶',
            'barcode': null,
            'series': null,
            'spec': null,
            'category_id': null,
            'brand': null,
            'purchase_price': null,
            'sale_price': null,
            'min_stock': null,
            'remark': null,
            'custom_fields': null,
          }
        }),
        data: payload,
      );

      final product = await repo.update(2, payload);

      expect(product.id, 2);
      expect(product.name, '茅台(升级)');
    });

    test('404 response throws AppException with status 404', () async {
      adapter.onPut(
        '/products/999',
        (server) => server.reply(404, {'error': 'product not found'}),
        data: {'name': 'X', 'code': 'X', 'unit': '个'},
      );

      expect(
        () => repo.update(999, {'name': 'X', 'code': 'X', 'unit': '个'}),
        throwsA(
          predicate<AppException>((e) => e.statusCode == 404),
        ),
      );
    });
  });

  // ---------------------------------------------------------------------------
  // delete()
  // ---------------------------------------------------------------------------
  group('ProductRepository.delete()', () {
    test('completes without error on 200', () async {
      adapter.onDelete(
        '/products/1',
        (server) => server.reply(200, {'message': 'deleted'}),
      );

      await expectLater(repo.delete(1), completes);
    });

    test('404 response throws AppException', () async {
      adapter.onDelete(
        '/products/999',
        (server) => server.reply(404, {'error': 'product not found'}),
      );

      expect(
        () => repo.delete(999),
        throwsA(isA<AppException>()),
      );
    });
  });
}