// 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.

// @dart = 2.8

import 'dart:async';

import 'package:flutter_tools/src/application_package.dart';
import 'package:flutter_tools/src/build_info.dart';
import 'package:flutter_tools/src/device.dart';
import 'package:flutter_tools/src/project.dart';

/// A list of fake devices to test JSON serialization
/// (`Device.toJson()` and `--machine` flag for `devices` command)
List<FakeDeviceJsonData> fakeDevices = <FakeDeviceJsonData>[
  FakeDeviceJsonData(
    FakeDevice('ephemeral', 'ephemeral', type: PlatformType.android),
    <String, Object>{
      'name': 'ephemeral',
      'id': 'ephemeral',
      'isSupported': true,
      'targetPlatform': 'android-arm',
      'emulator': true,
      'sdk': 'Test SDK (1.2.3)',
      'capabilities': <String, Object>{
        'hotReload': true,
        'hotRestart': true,
        'screenshot': false,
        'fastStart': false,
        'flutterExit': true,
        'hardwareRendering': true,
        'startPaused': true
      }
    }
  ),
  FakeDeviceJsonData(
    FakeDevice('webby', 'webby')
      ..targetPlatform = Future<TargetPlatform>.value(TargetPlatform.web_javascript)
      ..sdkNameAndVersion = Future<String>.value('Web SDK (1.2.4)'),
    <String,Object>{
      'name': 'webby',
      'id': 'webby',
      'isSupported': true,
      'targetPlatform': 'web-javascript',
      'emulator': true,
      'sdk': 'Web SDK (1.2.4)',
      'capabilities': <String, Object>{
        'hotReload': true,
        'hotRestart': true,
        'screenshot': false,
        'fastStart': false,
        'flutterExit': true,
        'hardwareRendering': true,
        'startPaused': true
      }
    }
  ),
];

/// Fake device to test `devices` command.
class FakeDevice extends Device {
  FakeDevice(this.name, String id, {
    bool ephemeral = true,
    bool isSupported = true,
    PlatformType type = PlatformType.web,
    LaunchResult launchResult,
  }) : _isSupported = isSupported,
      _launchResult = launchResult ?? LaunchResult.succeeded(),
      super(
        id,
        platformType: type,
        category: Category.mobile,
        ephemeral: ephemeral,
      );

  final bool _isSupported;
  final LaunchResult _launchResult;

  @override
  final String name;

  @override
  Future<LaunchResult> startApp(covariant ApplicationPackage package, {
    String mainPath,
    String route,
    DebuggingOptions debuggingOptions,
    Map<String, dynamic> platformArgs,
    bool prebuiltApplication = false,
    bool ipv6 = false,
    String userIdentifier,
  }) async => _launchResult;

  @override
  Future<bool> stopApp(covariant ApplicationPackage app, {
    String userIdentifier,
  }) async => true;

  @override
  Future<bool> uninstallApp(
  covariant ApplicationPackage app, {
    String userIdentifier,
  }) async => true;

  @override
  Future<void> dispose() async {}

  @override
  Future<TargetPlatform> targetPlatform = Future<TargetPlatform>.value(TargetPlatform.android_arm);

  @override
  void noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);

  @override
  bool isSupportedForProject(FlutterProject flutterProject) => _isSupported;

  @override
  bool isSupported() => _isSupported;

  @override
  Future<bool> isLocalEmulator = Future<bool>.value(true);

  @override
  Future<String> sdkNameAndVersion = Future<String>.value('Test SDK (1.2.3)');
}

/// Combines fake device with its canonical JSON representation.
class FakeDeviceJsonData {
  FakeDeviceJsonData(this.dev, this.json);

  final FakeDevice dev;
  final Map<String, Object> json;
}

class FakePollingDeviceDiscovery extends PollingDeviceDiscovery {
  FakePollingDeviceDiscovery() : super('mock');

  final List<Device> _devices = <Device>[];
  final StreamController<Device> _onAddedController = StreamController<Device>.broadcast();
  final StreamController<Device> _onRemovedController = StreamController<Device>.broadcast();

  @override
  Future<List<Device>> pollingGetDevices({ Duration timeout }) async {
    lastPollingTimeout = timeout;
    return _devices;
  }

  Duration lastPollingTimeout;

  @override
  bool get supportsPlatform => true;

  @override
  bool get canListAnything => true;

  void addDevice(Device device) {
    _devices.add(device);
    _onAddedController.add(device);
  }

  void _removeDevice(Device device) {
    _devices.remove(device);
    _onRemovedController.add(device);
  }

  void setDevices(List<Device> devices) {
    while(_devices.isNotEmpty) {
      _removeDevice(_devices.first);
    }
    devices.forEach(addDevice);
  }

  @override
  Stream<Device> get onAdded => _onAddedController.stream;

  @override
  Stream<Device> get onRemoved => _onRemovedController.stream;
}

/// A fake implementation of the [DeviceLogReader].
class FakeDeviceLogReader extends DeviceLogReader {
  @override
  String get name => 'FakeLogReader';

  StreamController<String> _cachedLinesController;

  bool disposed = false;

  final List<String> _lineQueue = <String>[];
  StreamController<String> get _linesController {
    _cachedLinesController ??= StreamController<String>
        .broadcast(onListen: () {
      _lineQueue.forEach(_linesController.add);
      _lineQueue.clear();
    });
    return _cachedLinesController;
  }

  @override
  Stream<String> get logLines => _linesController.stream;

  void addLine(String line) {
    if (_linesController.hasListener) {
      _linesController.add(line);
    } else {
      _lineQueue.add(line);
    }
  }

  @override
  Future<void> dispose() async {
    _lineQueue.clear();
    await _linesController.close();
    disposed = true;
  }
}