// 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 'dart:convert';
import 'dart:io' as io show IOSink;

import 'package:flutter_tools/src/android/android_device.dart';
import 'package:flutter_tools/src/android/android_sdk.dart' show AndroidSdk;
import 'package:flutter_tools/src/base/bot_detector.dart';
import 'package:flutter_tools/src/base/context.dart';
import 'package:flutter_tools/src/base/file_system.dart' hide IOSink;
import 'package:flutter_tools/src/base/io.dart';
import 'package:flutter_tools/src/base/platform.dart';
import 'package:flutter_tools/src/build_info.dart';
import 'package:flutter_tools/src/compile.dart';
import 'package:flutter_tools/src/globals.dart' as globals;
import 'package:flutter_tools/src/ios/devices.dart';
import 'package:flutter_tools/src/project.dart';
import 'package:mockito/mockito.dart';
import 'package:package_config/package_config.dart';
import 'package:process/process.dart';

import 'common.dart';
import 'fakes.dart';

// TODO(fujino): replace FakePlatform.fromPlatform() with FakePlatform()
final Generator kNoColorTerminalPlatform = () {
  return FakePlatform.fromPlatform(
    const LocalPlatform()
  )..stdoutSupportsAnsi = false;
};

/// An SDK installation with several SDK levels (19, 22, 23).
class MockAndroidSdk extends Mock implements AndroidSdk {
  static Directory createSdkDirectory({
    bool withAndroidN = false,
    bool withSdkManager = true,
    bool withPlatformTools = true,
    bool withBuildTools = true,
  }) {
    final Directory dir = globals.fs.systemTempDirectory.createTempSync('flutter_mock_android_sdk.');
    final String exe = globals.platform.isWindows ? '.exe' : '';
    final String bat = globals.platform.isWindows ? '.bat' : '';

    _createDir(dir, 'licenses');

    if (withPlatformTools) {
      _createSdkFile(dir, 'platform-tools/adb$exe');
    }

    if (withBuildTools) {
      _createSdkFile(dir, 'build-tools/19.1.0/aapt$exe');
      _createSdkFile(dir, 'build-tools/22.0.1/aapt$exe');
      _createSdkFile(dir, 'build-tools/23.0.2/aapt$exe');
      if (withAndroidN) {
        _createSdkFile(dir, 'build-tools/24.0.0-preview/aapt$exe');
      }
    }

    _createSdkFile(dir, 'platforms/android-22/android.jar');
    _createSdkFile(dir, 'platforms/android-23/android.jar');
    if (withAndroidN) {
      _createSdkFile(dir, 'platforms/android-N/android.jar');
      _createSdkFile(dir, 'platforms/android-N/build.prop', contents: _buildProp);
    }

    if (withSdkManager) {
      _createSdkFile(dir, 'tools/bin/sdkmanager$bat');
    }

    return dir;
  }

  static void _createSdkFile(Directory dir, String filePath, { String contents }) {
    final File file = dir.childFile(filePath);
    file.createSync(recursive: true);
    if (contents != null) {
      file.writeAsStringSync(contents, flush: true);
    }
  }

  static void _createDir(Directory dir, String path) {
    final Directory directory = globals.fs.directory(globals.fs.path.join(dir.path, path));
    directory.createSync(recursive: true);
  }

  static const String _buildProp = r'''
ro.build.version.incremental=1624448
ro.build.version.sdk=24
ro.build.version.codename=REL
''';
}

/// A strategy for creating Process objects from a list of commands.
typedef ProcessFactory = Process Function(List<String> command);

/// A ProcessManager that starts Processes by delegating to a ProcessFactory.
class MockProcessManager extends Mock implements ProcessManager {
  ProcessFactory processFactory = (List<String> commands) => MockProcess();
  bool canRunSucceeds = true;
  bool runSucceeds = true;
  List<String> commands;

  @override
  bool canRun(dynamic command, { String workingDirectory }) => canRunSucceeds;

  @override
  Future<Process> start(
    List<dynamic> command, {
    String workingDirectory,
    Map<String, String> environment,
    bool includeParentEnvironment = true,
    bool runInShell = false,
    ProcessStartMode mode = ProcessStartMode.normal,
  }) {
    final List<String> commands = command.cast<String>();
    if (!runSucceeds) {
      final String executable = commands[0];
      final List<String> arguments = commands.length > 1 ? commands.sublist(1) : <String>[];
      throw ProcessException(executable, arguments);
    }

    this.commands = commands;
    return Future<Process>.value(processFactory(commands));
  }
}

/// A function that generates a process factory that gives processes that fail
/// a given number of times before succeeding. The returned processes will
/// fail after a delay if one is supplied.
ProcessFactory flakyProcessFactory({
  int flakes,
  bool Function(List<String> command) filter,
  Duration delay,
  Stream<List<int>> Function() stdout,
  Stream<List<int>> Function() stderr,
}) {
  int flakesLeft = flakes;
  stdout ??= () => const Stream<List<int>>.empty();
  stderr ??= () => const Stream<List<int>>.empty();
  return (List<String> command) {
    if (filter != null && !filter(command)) {
      return MockProcess();
    }
    if (flakesLeft == 0) {
      return MockProcess(
        exitCode: Future<int>.value(0),
        stdout: stdout(),
        stderr: stderr(),
      );
    }
    flakesLeft = flakesLeft - 1;
    Future<int> exitFuture;
    if (delay == null) {
      exitFuture = Future<int>.value(-9);
    } else {
      exitFuture = Future<int>.delayed(delay, () => Future<int>.value(-9));
    }
    return MockProcess(
      exitCode: exitFuture,
      stdout: stdout(),
      stderr: stderr(),
    );
  };
}

/// Creates a mock process that returns with the given [exitCode], [stdout] and [stderr].
Process createMockProcess({ int exitCode = 0, String stdout = '', String stderr = '' }) {
  final Stream<List<int>> stdoutStream = Stream<List<int>>.fromIterable(<List<int>>[
    utf8.encode(stdout),
  ]);
  final Stream<List<int>> stderrStream = Stream<List<int>>.fromIterable(<List<int>>[
    utf8.encode(stderr),
  ]);
  final Process process = MockBasicProcess();

  when(process.stdout).thenAnswer((_) => stdoutStream);
  when(process.stderr).thenAnswer((_) => stderrStream);
  when(process.exitCode).thenAnswer((_) => Future<int>.value(exitCode));
  return process;
}

class MockBasicProcess extends Mock implements Process {}

/// A process that exits successfully with no output and ignores all input.
class MockProcess extends Mock implements Process {
  MockProcess({
    this.pid = 1,
    Future<int> exitCode,
    Stream<List<int>> stdin,
    this.stdout = const Stream<List<int>>.empty(),
    this.stderr = const Stream<List<int>>.empty(),
  }) : exitCode = exitCode ?? Future<int>.value(0),
       stdin = stdin as IOSink ?? MemoryIOSink();

  @override
  final int pid;

  @override
  final Future<int> exitCode;

  @override
  final io.IOSink stdin;

  @override
  final Stream<List<int>> stdout;

  @override
  final Stream<List<int>> stderr;
}

class MockIosProject extends Mock implements IosProject {
  static const String bundleId = 'com.example.test';
  static const String appBundleName = 'My Super Awesome App.app';

  @override
  Future<String> productBundleIdentifier(BuildInfo buildInfo) async => bundleId;

  @override
  Future<String> hostAppBundleName(BuildInfo buildInfo) async => appBundleName;
}

class MockAndroidDevice extends Mock implements AndroidDevice {
  @override
  Future<TargetPlatform> get targetPlatform async => TargetPlatform.android_arm;

  @override
  bool isSupported() => true;

  @override
  bool get supportsHotRestart => true;

  @override
  bool get supportsFlutterExit => false;

  @override
  bool isSupportedForProject(FlutterProject flutterProject) => true;
}

class MockIOSDevice extends Mock implements IOSDevice {
  @override
  Future<TargetPlatform> get targetPlatform async => TargetPlatform.ios;

  @override
  bool isSupported() => true;

  @override
  bool isSupportedForProject(FlutterProject flutterProject) => true;
}

/// Common functionality for tracking mock interaction.
class BasicMock {
  final List<String> messages = <String>[];

  void expectMessages(List<String> expectedMessages) {
    final List<String> actualMessages = List<String>.of(messages);
    messages.clear();
    expect(actualMessages, unorderedEquals(expectedMessages));
  }

  bool contains(String match) {
    print('Checking for `$match` in:');
    print(messages);
    final bool result = messages.contains(match);
    messages.clear();
    return result;
  }
}

class MockResidentCompiler extends BasicMock implements ResidentCompiler {
  @override
  void accept() { }

  @override
  Future<CompilerOutput> reject() async { return null; }

  @override
  void reset() { }

  @override
  Future<dynamic> shutdown() async { }

  @override
  Future<CompilerOutput> compileExpression(
    String expression,
    List<String> definitions,
    List<String> typeDefinitions,
    String libraryUri,
    String klass,
    bool isStatic,
  ) async {
    return null;
  }

  @override
  Future<CompilerOutput> compileExpressionToJs(
    String libraryUri,
    int line,
    int column,
    Map<String, String> jsModules,
    Map<String, String> jsFrameValues,
    String moduleName,
    String expression,
  ) async {
    return null;
  }

  @override
  Future<CompilerOutput> recompile(Uri mainPath, List<Uri> invalidatedFiles, {
    String outputPath,
    PackageConfig packageConfig,
    bool suppressErrors = false,
  }) async {
    globals.fs.file(outputPath).createSync(recursive: true);
    globals.fs.file(outputPath).writeAsStringSync('compiled_kernel_output');
    return CompilerOutput(outputPath, 0, <Uri>[]);
  }

  @override
  void addFileSystemRoot(String root) { }
}

/// A fake implementation of [ProcessResult].
class FakeProcessResult implements ProcessResult {
  FakeProcessResult({
    this.exitCode = 0,
    this.pid = 1,
    this.stderr,
    this.stdout,
  });

  @override
  final int exitCode;

  @override
  final int pid;

  @override
  final dynamic stderr;

  @override
  final dynamic stdout;

  @override
  String toString() => stdout?.toString() ?? stderr?.toString() ?? runtimeType.toString();
}

class MockStdIn extends Mock implements IOSink {
  final StringBuffer stdInWrites = StringBuffer();

  String getAndClear() {
    final String result = stdInWrites.toString();
    stdInWrites.clear();
    return result;
  }

  @override
  void write([ Object o = '' ]) {
    stdInWrites.write(o);
  }

  @override
  void writeln([ Object o = '' ]) {
    stdInWrites.writeln(o);
  }
}

class MockStream extends Mock implements Stream<List<int>> {}

class AlwaysTrueBotDetector implements BotDetector {
  const AlwaysTrueBotDetector();

  @override
  Future<bool> get isRunningOnBot async => true;
}


class AlwaysFalseBotDetector implements BotDetector {
  const AlwaysFalseBotDetector();

  @override
  Future<bool> get isRunningOnBot async => false;
}