import 'dart:async';
import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/services.dart' show MethodCall, MethodChannel;
import 'package:hepan_everyday/services/app_update_service.dart';

class TestUpdateTransport implements UpdateTransport {
  int calls = 0;
  Uri? endpoint;
  Completer<UpdateHttpResponse>? pending;
  UpdateHttpResponse response = UpdateHttpResponse(
    200,
    utf8.encode(
      jsonEncode({
        'schema_version': 1,
        'application_id': 'com.tpschedule.app',
        'latest': {
          'version': '0.8.0',
          'build_number': 25,
          'notes': '新增更新检查\n修复导入',
          'download_url': 'https://app.glowtps.cn/downloads/TPSchedule.apk',
        },
      }),
    ),
  );
  @override
  Future<UpdateHttpResponse> get(Uri endpoint) async {
    calls++;
    this.endpoint = endpoint;
    return pending == null ? response : pending!.future;
  }
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  test('browser channel receives only validated HTTPS links', () async {
    final calls = <MethodCall>[];
    const channel = MethodChannel('com.tpschedule.app/updates');
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (call) async {
          calls.add(call);
          return true;
        });
    addTearDown(
      () => TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, null),
    );
    expect(
      await openUpdateInBrowser(Uri.parse('javascript:alert(1)')),
      isFalse,
    );
    expect(
      await openUpdateInBrowser(
        Uri.parse('https://name:password@example.com/app.apk'),
      ),
      isFalse,
    );
    expect(calls, isEmpty);
    expect(
      await openUpdateInBrowser(Uri.parse('https://example.com/app.apk')),
      isTrue,
    );
    expect(calls.single.method, 'openDownload');
    expect(calls.single.arguments, {'url': 'https://example.com/app.apk'});
  });
  test(
    'build number determines updates and displayed notes and URL survive',
    () async {
      final transport = TestUpdateTransport();
      final client = AppUpdateService(transport: transport, currentBuild: 24);
      final release = await client.check();
      expect(release!.version, '0.8.0');
      expect(release.notes, '新增更新检查\n修复导入');
      expect(
        release.downloadUri.toString(),
        'https://app.glowtps.cn/downloads/TPSchedule.apk',
      );
      expect(
        transport.endpoint.toString(),
        'https://app.glowtps.cn/v1/updates/android',
      );
      expect(
        await AppUpdateService(transport: transport, currentBuild: 25).check(),
        isNull,
      );
      expect(
        await AppUpdateService(transport: transport, currentBuild: 26).check(),
        isNull,
      );
    },
  );
  test(
    'simultaneous checks share a request and a later check refreshes',
    () async {
      final transport = TestUpdateTransport()..pending = Completer();
      final service = AppUpdateService(transport: transport, currentBuild: 24);
      final a = service.check(), b = service.check();
      await Future<void>.value();
      expect(transport.calls, 1);
      transport.pending!.complete(transport.response);
      expect((await a)!.buildNumber, 25);
      expect((await b)!.buildNumber, 25);
      transport.pending = null;
      await service.check();
      expect(transport.calls, 2);
    },
  );
  test(
    'unpublished server and equal versions are an ordinary no-update result',
    () async {
      final transport = TestUpdateTransport()
        ..response = UpdateHttpResponse(
          200,
          utf8.encode(
            '{"schema_version":1,"application_id":"com.tpschedule.app","latest":null}',
          ),
        );
      expect(await AppUpdateService(transport: transport).check(), isNull);
    },
  );
  test('bad identity, HTML response, unsafe URL and oversized responses fail honestly', () async {
    final transport = TestUpdateTransport();
    final good = utf8.decode(transport.response.body);
    for (final body in [
      good.replaceFirst('com.tpschedule.app', 'another.app'),
      '<html>WAF challenge</html>',
      good.replaceFirst(
        'https://app.glowtps.cn/downloads/TPSchedule.apk',
        'javascript:alert(1)',
      ),
      good.replaceFirst(
        'https://app.glowtps.cn/downloads/TPSchedule.apk',
        'https://user:secret@example.com/app.apk',
      ),
      good.replaceFirst('"build_number":25', '"build_number":0'),
      good.replaceFirst('"notes":"', '"notes":123,"other":"'),
      'x' * (64 * 1024 + 1),
    ]) {
      transport.response = UpdateHttpResponse(200, utf8.encode(body));
      await expectLater(
        AppUpdateService(transport: transport).check(),
        throwsA(isA<UpdateCheckException>()),
      );
    }
    transport.response = UpdateHttpResponse(503, utf8.encode('{}'));
    await expectLater(
      AppUpdateService(transport: transport).check(),
      throwsA(isA<UpdateCheckException>()),
    );
  });
}