// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'package:dds/dds.dart';
import 'package:file/memory.dart';
import 'package:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/base/io.dart';
import 'package:flutter_tools/src/base/logger.dart';
import 'package:flutter_tools/src/base/platform.dart';
import 'package:flutter_tools/src/build_info.dart';
import 'package:flutter_tools/src/device.dart';
import 'package:flutter_tools/src/test/flutter_tester_device.dart';
import 'package:flutter_tools/src/test/font_config_manager.dart';
import 'package:flutter_tools/src/vmservice.dart';
import 'package:stream_channel/stream_channel.dart';
import 'package:test/fake.dart';

import '../src/context.dart';
import '../src/fake_process_manager.dart';
import '../src/fake_vm_services.dart';

void main() {
  late FakePlatform platform;
  late FileSystem fileSystem;
  late FakeProcessManager processManager;
  late FlutterTesterTestDevice device;

  setUp(() {
    fileSystem = MemoryFileSystem.test();
    // Not Windows.
    platform = FakePlatform(
      environment: <String, String>{},
    );
    processManager = FakeProcessManager.any();
  });

  FlutterTesterTestDevice createDevice({
    List<String> dartEntrypointArgs = const <String>[],
    bool enableVmService = false,
    bool enableImpeller = false,
  }) =>
    TestFlutterTesterDevice(
      platform: platform,
      fileSystem: fileSystem,
      processManager: processManager,
      enableVmService: enableVmService,
      dartEntrypointArgs: dartEntrypointArgs,
      uriConverter: (String input) => '$input/converted',
      enableImpeller: enableImpeller,
    );

  testUsingContext('Missing dir error caught for FontConfigManger.dispose', () async {
    final FontConfigManager fontConfigManager = FontConfigManager();

    final Directory fontsDirectory = fileSystem.file(fontConfigManager.fontConfigFile).parent;
    fontsDirectory.deleteSync(recursive: true);

    await fontConfigManager.dispose();
  }, overrides: <Type, Generator>{
    FileSystem: () => fileSystem,
    ProcessManager: () => processManager,
  });

  testUsingContext('Flutter tester passes through impeller config and environment variables.', () async {
    processManager = FakeProcessManager.list(<FakeCommand>[]);
    device = createDevice(enableImpeller: true);
    processManager.addCommand(FakeCommand(command: const <String>[
        '/',
        '--disable-vm-service',
        '--ipv6',
        '--enable-checked-mode',
        '--verify-entry-points',
        '--enable-impeller',
        '--enable-dart-profiling',
        '--non-interactive',
        '--use-test-fonts',
        '--disable-asset-fonts',
        '--packages=.dart_tool/package_config.json',
        'example.dill',
      ], environment: <String, String>{
        'FLUTTER_TEST': 'true',
        'FONTCONFIG_FILE': device.fontConfigManager.fontConfigFile.path,
        'SERVER_PORT': '0',
        'APP_NAME': '',
        'FLUTTER_TEST_IMPELLER': 'true',
      }));

    await device.start('example.dill');

    expect(processManager, hasNoRemainingExpectations);
  }, overrides: <Type, Generator>{
    FileSystem: () => fileSystem,
    ProcessManager: () => processManager,
  });

  group('The FLUTTER_TEST environment variable is passed to the test process', () {
    setUp(() {
      processManager = FakeProcessManager.list(<FakeCommand>[]);
      device = createDevice();

      fileSystem
          .file('.dart_tool/package_config.json')
        ..createSync(recursive: true)
        ..writeAsStringSync('{"configVersion":2,"packages":[]}');
    });

    FakeCommand flutterTestCommand(String expectedFlutterTestValue) {
      return FakeCommand(command: const <String>[
        '/',
        '--disable-vm-service',
        '--ipv6',
        '--enable-checked-mode',
        '--verify-entry-points',
        '--enable-software-rendering',
        '--skia-deterministic-rendering',
        '--enable-dart-profiling',
        '--non-interactive',
        '--use-test-fonts',
        '--disable-asset-fonts',
        '--packages=.dart_tool/package_config.json',
        'example.dill',
      ], environment: <String, String>{
        'FLUTTER_TEST': expectedFlutterTestValue,
        'FONTCONFIG_FILE': device.fontConfigManager.fontConfigFile.path,
        'SERVER_PORT': '0',
        'APP_NAME': '',
      });
    }

    testUsingContext('as true when not originally set', () async {
      processManager.addCommand(flutterTestCommand('true'));

      await device.start('example.dill');
      expect(processManager, hasNoRemainingExpectations);
    });

    testUsingContext('as true when set to true', () async {
      platform.environment = <String, String>{'FLUTTER_TEST': 'true'};
      processManager.addCommand(flutterTestCommand('true'));

      await device.start('example.dill');
      expect(processManager, hasNoRemainingExpectations);
    });

    testUsingContext('as false when set to false', () async {
      platform.environment = <String, String>{'FLUTTER_TEST': 'false'};
      processManager.addCommand(flutterTestCommand('false'));

      await device.start('example.dill');
      expect(processManager, hasNoRemainingExpectations);
    });

    testUsingContext('unchanged when set', () async {
      platform.environment = <String, String>{'FLUTTER_TEST': 'neither true nor false'};
      processManager.addCommand(flutterTestCommand('neither true nor false'));

      await device.start('example.dill');
      expect(processManager, hasNoRemainingExpectations);
    });
  });

  group('Dart Entrypoint Args', () {
    setUp(() {
      processManager = FakeProcessManager.list(<FakeCommand>[
        const FakeCommand(
          command: <String>[
            '/',
            '--disable-vm-service',
            '--ipv6',
            '--enable-checked-mode',
            '--verify-entry-points',
            '--enable-software-rendering',
            '--skia-deterministic-rendering',
            '--enable-dart-profiling',
            '--non-interactive',
            '--use-test-fonts',
            '--disable-asset-fonts',
            '--packages=.dart_tool/package_config.json',
            '--foo',
            '--bar',
            'example.dill',
          ],
          stdout: 'success',
          stderr: 'failure',
        ),
      ]);
      device = createDevice(dartEntrypointArgs: <String>['--foo', '--bar']);
    });

    testUsingContext('Can pass additional arguments to tester binary', () async {
      await device.start('example.dill');

      expect(processManager, hasNoRemainingExpectations);
    });
  });

  group('DDS', () {
    setUp(() {
      processManager = FakeProcessManager.list(<FakeCommand>[
        const FakeCommand(
          command: <String>[
            '/',
            '--vm-service-port=0',
            '--ipv6',
            '--enable-checked-mode',
            '--verify-entry-points',
            '--enable-software-rendering',
            '--skia-deterministic-rendering',
            '--enable-dart-profiling',
            '--non-interactive',
            '--use-test-fonts',
            '--disable-asset-fonts',
            '--packages=.dart_tool/package_config.json',
            'example.dill',
          ],
          stdout: 'The Dart VM service is listening on http://localhost:1234',
          stderr: 'failure',
        ),
      ]);
      device = createDevice(enableVmService: true);
    });

    testUsingContext('skips setting VM Service port and uses the input port for DDS instead', () async {
      await device.start('example.dill');
      await device.vmServiceUri;

      final Uri uri = await (device as TestFlutterTesterDevice).ddsServiceUriFuture();
      expect(uri.port, 1234);
    });

    testUsingContext('sets up UriConverter from context', () async {
      await device.start('example.dill');
      await device.vmServiceUri;

      final FakeDartDevelopmentService dds = (device as TestFlutterTesterDevice).dds
      as FakeDartDevelopmentService;
      final String? result = dds
          .uriConverter
          ?.call('test');
      expect(result, 'test/converted');
    });
  });
}

/// A Flutter Tester device.
///
/// Uses a mock HttpServer. We don't want to bind random ports in our CI hosts.
class TestFlutterTesterDevice extends FlutterTesterTestDevice {
  TestFlutterTesterDevice({
    required super.platform,
    required super.fileSystem,
    required super.processManager,
    required super.enableVmService,
    required List<String> dartEntrypointArgs,
    required UriConverter uriConverter,
    required bool enableImpeller,
  }) : super(
    id: 999,
    shellPath: '/',
    logger: BufferLogger.test(),
    debuggingOptions: DebuggingOptions.enabled(
      const BuildInfo(
        BuildMode.debug,
        '',
        treeShakeIcons: false,
      ),
      hostVmServicePort: 1234,
      dartEntrypointArgs: dartEntrypointArgs,
      enableImpeller: enableImpeller ? ImpellerStatus.enabled : ImpellerStatus.platformDefault,
    ),
    machine: false,
    host: InternetAddress.loopbackIPv6,
    testAssetDirectory: null,
    flutterProject: null,
    icudtlPath: null,
    compileExpression: null,
    fontConfigManager: FontConfigManager(),
    uriConverter: uriConverter,
  );
  late DartDevelopmentService dds;

  final Completer<Uri> _ddsServiceUriCompleter = Completer<Uri>();

  Future<Uri> ddsServiceUriFuture() => _ddsServiceUriCompleter.future;

  @override
  Future<DartDevelopmentService> startDds(
    Uri uri, {
    UriConverter? uriConverter,
  }) async {
    _ddsServiceUriCompleter.complete(uri);
    dds = FakeDartDevelopmentService(
      Uri.parse('http://localhost:${debuggingOptions.hostVmServicePort}'),
      Uri.parse('http://localhost:8080'),
      uriConverter: uriConverter,
    );
    return dds;
  }

  @override
  Future<FlutterVmService> connectToVmServiceImpl(
    Uri httpUri, {
    CompileExpression? compileExpression,
    required Logger logger,
  }) async {
    return FakeVmServiceHost(requests: <VmServiceExpectation>[
      const FakeVmServiceRequest(method: '_serveObservatory'),
    ]).vmService;
  }

  @override
  Future<HttpServer> bind(InternetAddress? host, int port) async => FakeHttpServer();

  @override
  Future<StreamChannel<String>> get remoteChannel async => StreamChannelController<String>().foreign;
}

class FakeDartDevelopmentService extends Fake implements DartDevelopmentService {
  FakeDartDevelopmentService(this.uri, this.original, {this.uriConverter});

  final Uri original;
  final UriConverter? uriConverter;

  @override
  final Uri uri;

  @override
  Uri get remoteVmServiceUri => original;
}
class FakeHttpServer extends Fake implements HttpServer {
  @override
  int get port => 0;
}