// Copyright 2016 The Chromium 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:flutter_tools/src/android/android_device.dart';
import 'package:flutter_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/base/logger.dart';
import 'package:flutter_tools/src/base/os.dart';
import 'package:flutter_tools/src/commands/drive.dart';
import 'package:flutter_tools/src/device.dart';
import 'package:flutter_tools/src/globals.dart';
import 'package:flutter_tools/src/ios/simulators.dart';
import 'package:mockito/mockito.dart';
import 'package:test/test.dart';

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

void main() {
  group('drive', () {
    DriveCommand command;
    Device mockDevice;

    void withMockDevice([Device mock]) {
      mockDevice = mock ?? new MockDevice();
      targetDeviceFinder = () async => mockDevice;
      testDeviceManager.addDevice(mockDevice);
    }

    setUp(() {
      command = new DriveCommand();
      applyMocksToCommand(command);
      useInMemoryFileSystem(cwd: '/some/app');
      targetDeviceFinder = () {
        throw 'Unexpected call to targetDeviceFinder';
      };
      appStarter = (_, __) {
        throw 'Unexpected call to appStarter';
      };
      testRunner = (_) {
        throw 'Unexpected call to testRunner';
      };
      appStopper = (_) {
        throw 'Unexpected call to appStopper';
      };
    });

    tearDown(() {
      command = null;
      restoreFileSystem();
      restoreAppStarter();
      restoreAppStopper();
      restoreTestRunner();
      restoreTargetDeviceFinder();
    });

    testUsingContext('returns 1 when test file is not found', () {
      withMockDevice();
      List<String> args = <String>[
        'drive',
        '--target=/some/app/test/e2e.dart',
      ];
      return createTestCommandRunner(command).run(args).then((int code) {
        expect(code, 1);
        BufferLogger buffer = logger;
        expect(buffer.errorText, contains(
          'Test file not found: /some/app/test_driver/e2e_test.dart'
        ));
      });
    });

    testUsingContext('returns 1 when app fails to run', () async {
      withMockDevice();
      appStarter = expectAsync((_, __) async => 1);

      String testApp = '/some/app/test_driver/e2e.dart';
      String testFile = '/some/app/test_driver/e2e_test.dart';

      MemoryFileSystem memFs = fs;
      await memFs.file(testApp).writeAsString('main() {}');
      await memFs.file(testFile).writeAsString('main() {}');

      List<String> args = <String>[
        'drive',
        '--target=$testApp',
      ];
      return createTestCommandRunner(command).run(args).then((int code) {
        expect(code, 1);
        BufferLogger buffer = logger;
        expect(buffer.errorText, contains(
          'Application failed to start. Will not run test. Quitting.'
        ));
      });
    });

    testUsingContext('returns 1 when app file is outside package', () async {
      String packageDir = '/my/app';
      useInMemoryFileSystem(cwd: packageDir);

      String appFile = '/not/in/my/app.dart';
      List<String> args = <String>[
        'drive',
        '--target=$appFile',
      ];
      return createTestCommandRunner(command).run(args).then((int code) {
        expect(code, 1);
        BufferLogger buffer = logger;
        expect(buffer.errorText, contains(
          'Application file $appFile is outside the package directory $packageDir'
        ));
      });
    });

    testUsingContext('returns 1 when app file is in the root dir', () async {
      String packageDir = '/my/app';
      useInMemoryFileSystem(cwd: packageDir);

      String appFile = '/my/app/main.dart';
      List<String> args = <String>[
        'drive',
        '--target=$appFile',
      ];
      return createTestCommandRunner(command).run(args).then((int code) {
        expect(code, 1);
        BufferLogger buffer = logger;
        expect(buffer.errorText, contains(
          'Application file main.dart must reside in one of the '
          'sub-directories of the package structure, not in the root directory.'
        ));
      });
    });

    testUsingContext('returns 0 when test ends successfully', () async {
      withMockDevice();

      String testApp = '/some/app/test/e2e.dart';
      String testFile = '/some/app/test_driver/e2e_test.dart';

      appStarter = expectAsync((_, __) {
        return new Future<int>.value(0);
      });
      testRunner = expectAsync((List<String> testArgs) {
        expect(testArgs, <String>[testFile]);
        return new Future<int>.value(0);
      });
      appStopper = expectAsync((_) {
        return new Future<int>.value(0);
      });

      MemoryFileSystem memFs = fs;
      await memFs.file(testApp).writeAsString('main() {}');
      await memFs.file(testFile).writeAsString('main() {}');

      List<String> args = <String>[
        'drive',
        '--target=$testApp',
      ];
      return createTestCommandRunner(command).run(args).then((int code) {
        expect(code, 0);
        BufferLogger buffer = logger;
        expect(buffer.errorText, isEmpty);
      });
    });

    testUsingContext('returns exitCode set by test runner', () async {
      withMockDevice();

      String testApp = '/some/app/test/e2e.dart';
      String testFile = '/some/app/test_driver/e2e_test.dart';

      appStarter = expectAsync((_, __) {
        return new Future<int>.value(0);
      });
      testRunner = expectAsync((_) {
        return new Future<int>.value(123);
      });
      appStopper = expectAsync((_) {
        return new Future<int>.value(0);
      });

      MemoryFileSystem memFs = fs;
      await memFs.file(testApp).writeAsString('main() {}');
      await memFs.file(testFile).writeAsString('main() {}');

      List<String> args = <String>[
        'drive',
        '--target=$testApp',
      ];
      return createTestCommandRunner(command).run(args).then((int code) {
        expect(code, 123);
        BufferLogger buffer = logger;
        expect(buffer.errorText, isEmpty);
      });
    });


    group('findTargetDevice', () {
      testUsingContext('uses specified device', () async {
        testDeviceManager.specifiedDeviceId = '123';
        withMockDevice();
        when(mockDevice.name).thenReturn('specified-device');
        when(mockDevice.id).thenReturn('123');

        Device device = await findTargetDevice();
        expect(device.name, 'specified-device');
      });
    });

    group('findTargetDevice on iOS', () {
      void setOs() {
        when(os.isMacOS).thenReturn(true);
        when(os.isLinux).thenReturn(false);
      }

      testUsingContext('uses existing emulator', () async {
        setOs();
        withMockDevice();
        when(mockDevice.name).thenReturn('mock-simulator');
        when(mockDevice.isLocalEmulator).thenReturn(true);

        Device device = await findTargetDevice();
        expect(device.name, 'mock-simulator');
      });

      testUsingContext('uses existing Android device if and there are no simulators', () async {
        setOs();
        mockDevice = new MockAndroidDevice();
        when(mockDevice.name).thenReturn('mock-android-device');
        when(mockDevice.isLocalEmulator).thenReturn(false);
        withMockDevice(mockDevice);

        Device device = await findTargetDevice();
        expect(device.name, 'mock-android-device');
      });

      testUsingContext('launches emulator', () async {
        setOs();
        when(SimControl.instance.boot()).thenReturn(true);
        Device emulator = new MockDevice();
        when(emulator.name).thenReturn('new-simulator');
        when(IOSSimulatorUtils.instance.getAttachedDevices())
            .thenReturn(<Device>[emulator]);

        Device device = await findTargetDevice();
        expect(device.name, 'new-simulator');
      });
    });

    group('findTargetDevice on Linux', () {
      void setOs() {
        when(os.isMacOS).thenReturn(false);
        when(os.isLinux).thenReturn(true);
      }

      testUsingContext('returns null if no devices found', () async {
        setOs();
        expect(await findTargetDevice(), isNull);
      });

      testUsingContext('uses existing Android device', () async {
        setOs();
        mockDevice = new MockAndroidDevice();
        when(mockDevice.name).thenReturn('mock-android-device');
        withMockDevice(mockDevice);

        Device device = await findTargetDevice();
        expect(device.name, 'mock-android-device');
      });
    });
  });
}

class MockDevice extends Mock implements Device {
  MockDevice() {
    when(this.isSupported()).thenReturn(true);
  }
}

class MockAndroidDevice extends Mock implements AndroidDevice { }