// 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:file/file.dart';
import 'package:file/memory.dart';
import 'package:flutter_tools/src/artifacts.dart';
import 'package:flutter_tools/src/base/config.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/build_system/build_system.dart';
import 'package:flutter_tools/src/device.dart';
import 'package:flutter_tools/src/tester/flutter_tester.dart';
import 'package:flutter_tools/src/version.dart';
import 'package:mockito/mockito.dart';
import 'package:process/process.dart';

import '../../src/common.dart';
import '../../src/context.dart';
import '../../src/mocks.dart';

void main() {
  MemoryFileSystem fileSystem;

  setUp(() {
    fileSystem = MemoryFileSystem.test();
  });

  testWithoutContext('FlutterTesterApp can be created from the current directory', () async {
    const String projectPath = '/home/my/projects/my_project';
    await fileSystem.directory(projectPath).create(recursive: true);
    fileSystem.currentDirectory = projectPath;

    final FlutterTesterApp app = FlutterTesterApp.fromCurrentDirectory(fileSystem);

    expect(app.name, 'my_project');
    expect(app.packagesFile.path, fileSystem.path.join(projectPath, '.packages'));
  });

  group('FlutterTesterDevices', () {
    tearDown(() {
      FlutterTesterDevices.showFlutterTesterDevice = false;
    });

    testWithoutContext('no device', () async {
      final FlutterTesterDevices discoverer = setUpFlutterTesterDevices();

      final List<Device> devices = await discoverer.devices;
      expect(devices, isEmpty);
    });

    testWithoutContext('has device', () async {
      FlutterTesterDevices.showFlutterTesterDevice = true;
      final FlutterTesterDevices discoverer = setUpFlutterTesterDevices();

      final List<Device> devices = await discoverer.devices;
      expect(devices, hasLength(1));

      final Device device = devices.single;
      expect(device, isA<FlutterTesterDevice>());
      expect(device.id, 'flutter-tester');
    });

    testWithoutContext('discoverDevices', () async {
      FlutterTesterDevices.showFlutterTesterDevice = true;
      final FlutterTesterDevices discoverer = setUpFlutterTesterDevices();

      // Timeout ignored.
      final List<Device> devices = await discoverer.discoverDevices(timeout: const Duration(seconds: 10));
      expect(devices, hasLength(1));
    });

  });
  group('startApp', () {
    FlutterTesterDevice device;
    List<String> logLines;
    String mainPath;

    MockProcessManager mockProcessManager;
    MockProcess mockProcess;
    MockBuildSystem mockBuildSystem;

    final Map<Type, Generator> startOverrides = <Type, Generator>{
      Platform: () => FakePlatform(operatingSystem: 'linux'),
      FileSystem: () => fileSystem,
      ProcessManager: () => mockProcessManager,
      Artifacts: () => Artifacts.test(),
      BuildSystem: () => mockBuildSystem,
    };

    setUp(() {
      mockBuildSystem = MockBuildSystem();
      mockProcessManager = MockProcessManager();
      mockProcessManager.processFactory =
          (List<String> commands) => mockProcess;

      when(mockBuildSystem.build(
        any,
        any,
      )).thenAnswer((_) async {
        return BuildResult(success: true);
      });
      device = FlutterTesterDevice('flutter-tester',
        fileSystem: fileSystem,
        processManager: mockProcessManager,
        artifacts: Artifacts.test(),
        buildDirectory: 'build',
        logger: BufferLogger.test(),
        flutterVersion: MockFlutterVersion(),
      );
      logLines = <String>[];
      device.getLogReader().logLines.listen(logLines.add);
    });

    testWithoutContext('default settings', () async {
      expect(device.id, 'flutter-tester');
      expect(await device.isLocalEmulator, isFalse);
      expect(device.name, 'Flutter test device');
      expect(device.portForwarder, isNot(isNull));
      expect(await device.targetPlatform, TargetPlatform.tester);

      expect(await device.installApp(null), isTrue);
      expect(await device.isAppInstalled(null), isFalse);
      expect(await device.isLatestBuildInstalled(null), isFalse);
      expect(await device.uninstallApp(null), isTrue);

      expect(device.isSupported(), isTrue);
    });

    testWithoutContext('does not accept profile, release, or jit-release builds', () async {
      final LaunchResult releaseResult = await device.startApp(null,
        mainPath: mainPath,
        debuggingOptions: DebuggingOptions.disabled(BuildInfo.release),
      );
      final LaunchResult profileResult = await device.startApp(null,
        mainPath: mainPath,
        debuggingOptions: DebuggingOptions.disabled(BuildInfo.profile),
      );
      final LaunchResult jitReleaseResult = await device.startApp(null,
        mainPath: mainPath,
        debuggingOptions: DebuggingOptions.disabled(BuildInfo.jitRelease),
      );

      expect(releaseResult.started, isFalse);
      expect(profileResult.started, isFalse);
      expect(jitReleaseResult.started, isFalse);
    });


    testUsingContext('performs a build and starts in debug mode', () async {
      final FlutterTesterApp app = FlutterTesterApp.fromCurrentDirectory(fileSystem);
      final Uri observatoryUri = Uri.parse('http://127.0.0.1:6666/');
      mockProcess = MockProcess(stdout: Stream<List<int>>.fromIterable(<List<int>>[
        '''
Observatory listening on $observatoryUri
Hello!
'''
            .codeUnits,
      ]));

      final LaunchResult result = await device.startApp(app,
        mainPath: mainPath,
        debuggingOptions: DebuggingOptions.enabled(BuildInfo.debug)
      );

      expect(result.started, isTrue);
      expect(result.observatoryUri, observatoryUri);
      expect(logLines.last, 'Hello!');
    }, overrides: startOverrides);
  });
}

FlutterTesterDevices setUpFlutterTesterDevices() {
  final FileSystem fileSystem = MemoryFileSystem.test();
  final Logger logger = BufferLogger.test();
  return FlutterTesterDevices(
    logger: logger,
    artifacts: Artifacts.test(),
    processManager: FakeProcessManager.any(),
    fileSystem: MemoryFileSystem.test(),
    config: Config.test(
      'test',
      directory: fileSystem.currentDirectory,
      logger: logger,
    ),
    flutterVersion: MockFlutterVersion(),
  );
}

class MockBuildSystem extends Mock implements BuildSystem {}
class MockFlutterVersion extends Mock implements FlutterVersion {}