// Copyright 2017 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 'dart:io';

import 'package:googleapis/bigquery/v2.dart' as bq;
import 'package:googleapis_auth/auth_io.dart' as auth;
import 'package:http/http.dart' as http;
import 'package:path/path.dart' as path;

import 'flutter_compact_formatter.dart';
import 'run_command.dart';

typedef ShardRunner = Future<void> Function();

final String flutterRoot = path.dirname(path.dirname(path.dirname(path.fromUri(Platform.script))));
final String flutter = path.join(flutterRoot, 'bin', Platform.isWindows ? 'flutter.bat' : 'flutter');
final String dart = path.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', Platform.isWindows ? 'dart.exe' : 'dart');
final String pub = path.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', Platform.isWindows ? 'pub.bat' : 'pub');
final String pubCache = path.join(flutterRoot, '.pub-cache');
final List<String> flutterTestArgs = <String>[];


final bool useFlutterTestFormatter = Platform.environment['FLUTTER_TEST_FORMATTER'] == 'true';

final bool noUseBuildRunner = Platform.environment['FLUTTER_TEST_NO_BUILD_RUNNER'] == 'true';

const Map<String, ShardRunner> _kShards = <String, ShardRunner>{
  'tests': _runTests,
  'tool_tests': _runToolTests,
  'build_tests': _runBuildTests,
  'coverage': _runCoverage,
  'integration_tests': _runIntegrationTests,
  'add2app_test': _runAdd2AppTest,
};

const Duration _kLongTimeout = Duration(minutes: 45);
const Duration _kShortTimeout = Duration(minutes: 5);

/// When you call this, you can pass additional arguments to pass custom
/// arguments to flutter test. For example, you might want to call this
/// script with the parameter --local-engine=host_debug_unopt to
/// use your own build of the engine.
///
/// To run the tool_tests part, run it with SHARD=tool_tests
///
/// For example:
/// SHARD=tool_tests bin/cache/dart-sdk/bin/dart dev/bots/test.dart
/// bin/cache/dart-sdk/bin/dart dev/bots/test.dart --local-engine=host_debug_unopt
Future<void> main(List<String> args) async {
  flutterTestArgs.addAll(args);

  final String shard = Platform.environment['SHARD'];
  if (shard != null) {
    if (!_kShards.containsKey(shard)) {
      print('Invalid shard: $shard');
      print('The available shards are: ${_kShards.keys.join(", ")}');
      exit(1);
    }
    print('${bold}SHARD=$shard$reset');
    await _kShards[shard]();
  } else {
    for (String currentShard in _kShards.keys) {
      print('${bold}SHARD=$currentShard$reset');
      await _kShards[currentShard]();
      print('');
    }
  }
}

Future<void> _runSmokeTests() async {
  // Verify that the tests actually return failure on failure and success on
  // success.
  final String automatedTests = path.join(flutterRoot, 'dev', 'automated_tests');
  // We run the "pass" and "fail" smoke tests first, and alone, because those
  // are particularly critical and sensitive. If one of these fails, there's no
  // point even trying the others.
  await _runFlutterTest(automatedTests,
    script: path.join('test_smoke_test', 'pass_test.dart'),
    printOutput: false,
    timeout: _kShortTimeout,
  );
  await _runFlutterTest(automatedTests,
    script: path.join('test_smoke_test', 'fail_test.dart'),
    expectFailure: true,
    printOutput: false,
    timeout: _kShortTimeout,
  );
  // We run the timeout tests individually because they are timing-sensitive.
  await _runFlutterTest(automatedTests,
    script: path.join('test_smoke_test', 'timeout_pass_test.dart'),
    expectFailure: false,
    printOutput: false,
    timeout: _kShortTimeout,
  );
  await _runFlutterTest(automatedTests,
    script: path.join('test_smoke_test', 'timeout_fail_test.dart'),
    expectFailure: true,
    printOutput: false,
    timeout: _kShortTimeout,
  );
  // We run the remaining smoketests in parallel, because they each take some
  // time to run (e.g. compiling), so we don't want to run them in series,
  // especially on 20-core machines...
  await Future.wait<void>(
    <Future<void>>[
      _runFlutterTest(automatedTests,
        script: path.join('test_smoke_test', 'crash1_test.dart'),
        expectFailure: true,
        printOutput: false,
        timeout: _kShortTimeout,
      ),
      _runFlutterTest(automatedTests,
        script: path.join('test_smoke_test', 'crash2_test.dart'),
        expectFailure: true,
        printOutput: false,
        timeout: _kShortTimeout,
      ),
      _runFlutterTest(automatedTests,
        script: path.join('test_smoke_test', 'syntax_error_test.broken_dart'),
        expectFailure: true,
        printOutput: false,
        timeout: _kShortTimeout,
      ),
      _runFlutterTest(automatedTests,
        script: path.join('test_smoke_test', 'missing_import_test.broken_dart'),
        expectFailure: true,
        printOutput: false,
        timeout: _kShortTimeout,
      ),
      _runFlutterTest(automatedTests,
        script: path.join('test_smoke_test', 'disallow_error_reporter_modification_test.dart'),
        expectFailure: true,
        printOutput: false,
        timeout: _kShortTimeout,
      ),
      runCommand(flutter,
        <String>['drive', '--use-existing-app', '-t', path.join('test_driver', 'failure.dart')],
        workingDirectory: path.join(flutterRoot, 'packages', 'flutter_driver'),
        expectNonZeroExit: true,
        printOutput: false,
        timeout: _kShortTimeout,
      ),
    ],
  );

  // Verify that we correctly generated the version file.
  await _verifyVersion(path.join(flutterRoot, 'version'));
}

Future<bq.BigqueryApi> _getBigqueryApi() async {
  if (!useFlutterTestFormatter) {
    return null;
  }
  // TODO(dnfield): How will we do this on LUCI?
  final String privateKey = Platform.environment['GCLOUD_SERVICE_ACCOUNT_KEY'];
  // If we're on Cirrus and a non-collaborator is doing this, we can't get the key.
  if (privateKey == null || privateKey.isEmpty || privateKey.startsWith('ENCRYPTED[')) {
    return null;
  }
  try {
    final auth.ServiceAccountCredentials accountCredentials = auth.ServiceAccountCredentials(
      'flutter-ci-test-reporter@flutter-infra.iam.gserviceaccount.com',
      auth.ClientId.serviceAccount('114390419920880060881.apps.googleusercontent.com'),
      '-----BEGIN PRIVATE KEY-----\n$privateKey\n-----END PRIVATE KEY-----\n',
    );
    final List<String> scopes = <String>[bq.BigqueryApi.BigqueryInsertdataScope];
    final http.Client client = await auth.clientViaServiceAccount(accountCredentials, scopes);
    return bq.BigqueryApi(client);
  } catch (e) {
    print('Failed to get BigQuery API client.');
    print(e);
    return null;
  }
}

Future<void> _runToolTests() async {
  final bq.BigqueryApi bigqueryApi = await _getBigqueryApi();
  await _runSmokeTests();

  // The flutter_tool will currently be snapshotted without asserts. We need
  // to force it to be regenerated with them enabled.
  if (!Platform.isWindows) {
    File(path.join(flutterRoot, 'bin', 'cache', 'flutter_tools.snapshot')).deleteSync();
    File(path.join(flutterRoot, 'bin', 'cache', 'flutter_tools.stamp')).deleteSync();
  }
  if (noUseBuildRunner) {
    await _pubRunTest(
      path.join(flutterRoot, 'packages', 'flutter_tools'),
      tableData: bigqueryApi?.tabledata,
      enableFlutterToolAsserts: !Platform.isWindows,
    );
  } else {
    await _buildRunnerTest(
      path.join(flutterRoot, 'packages', 'flutter_tools'),
      flutterRoot,
      tableData: bigqueryApi?.tabledata,
      enableFlutterToolAsserts: !Platform.isWindows,
    );
  }

  print('${bold}DONE: All tests successful.$reset');
}

/// Verifies that AOT, APK, and IPA (if on macOS) builds of some
/// examples apps finish without crashing. It does not actually
/// launch the apps. That happens later in the devicelab. This is
/// just a smoke-test. In particular, this will verify we can build
/// when there are spaces in the path name for the Flutter SDK and
/// target app.
Future<void> _runBuildTests() async {
  final List<String> paths = <String>[
    path.join('examples', 'hello_world'),
    path.join('examples', 'flutter_gallery'),
    path.join('examples', 'flutter_view'),
  ];
  for (String path in paths) {
    await _flutterBuildAot(path);
    await _flutterBuildApk(path);
    await _flutterBuildIpa(path);
  }
  await _flutterBuildDart2js(path.join('dev', 'integration_tests', 'web'));

  print('${bold}DONE: All build tests successful.$reset');
}

Future<void> _flutterBuildDart2js(String relativePathToApplication) async {
  print('Running Dart2JS build tests...');
  await runCommand(flutter,
    <String>['build', 'web', '-v'],
    workingDirectory: path.join(flutterRoot, relativePathToApplication),
    expectNonZeroExit: false,
    timeout: _kShortTimeout,
  );
  print('Done.');
}

Future<void> _flutterBuildAot(String relativePathToApplication) async {
  print('Running AOT build tests...');
  await runCommand(flutter,
    <String>['build', 'aot', '-v'],
    workingDirectory: path.join(flutterRoot, relativePathToApplication),
    expectNonZeroExit: false,
    timeout: _kShortTimeout,
  );
  print('Done.');
}

Future<void> _flutterBuildApk(String relativePathToApplication) async {
  if (
        (Platform.environment['ANDROID_HOME']?.isEmpty ?? true) &&
        (Platform.environment['ANDROID_SDK_ROOT']?.isEmpty ?? true)) {
    return;
  }
  print('Running APK build tests...');
  await runCommand(flutter,
    <String>['build', 'apk', '--debug', '-v'],
    workingDirectory: path.join(flutterRoot, relativePathToApplication),
    expectNonZeroExit: false,
    timeout: _kShortTimeout,
  );
  print('Done.');
}

Future<void> _flutterBuildIpa(String relativePathToApplication) async {
  if (!Platform.isMacOS) {
    return;
  }
  print('Running IPA build tests...');
  // Install Cocoapods.  We don't have these checked in for the examples,
  // and build ios doesn't take care of it automatically.
  final File podfile = File(path.join(flutterRoot, relativePathToApplication, 'ios', 'Podfile'));
  if (podfile.existsSync()) {
    await runCommand('pod',
      <String>['install'],
      workingDirectory: podfile.parent.path,
      expectNonZeroExit: false,
      timeout: _kShortTimeout,
    );
  }
  await runCommand(flutter,
    <String>['build', 'ios', '--no-codesign', '--debug', '-v'],
    workingDirectory: path.join(flutterRoot, relativePathToApplication),
    expectNonZeroExit: false,
    timeout: _kShortTimeout,
  );
  print('Done.');
}

Future<void> _runAdd2AppTest() async {
  if (!Platform.isMacOS) {
    return;
  }
  print('Running Add2App iOS integration tests...');
  final String add2AppDir = path.join(flutterRoot, 'dev', 'integration_tests', 'ios_add2app');
  await runCommand('./build_and_test.sh',
    <String>[],
    workingDirectory: add2AppDir,
    expectNonZeroExit: false,
    timeout: _kShortTimeout,
  );
  print('Done.');
}

Future<void> _runTests() async {
  final bq.BigqueryApi bigqueryApi = await _getBigqueryApi();
  await _runSmokeTests();

  await _runFlutterTest(path.join(flutterRoot, 'packages', 'flutter'), tableData: bigqueryApi?.tabledata);
  // Only packages/flutter/test/widgets/widget_inspector_test.dart really
  // needs to be run with --track-widget-creation but it is nice to run
  // all of the tests in package:flutter with the flag to ensure that
  // the Dart kernel transformer triggered by the flag does not break anything.
  await _runFlutterTest(path.join(flutterRoot, 'packages', 'flutter'), options: <String>['--track-widget-creation'], tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'packages', 'flutter_localizations'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'packages', 'flutter_driver'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'packages', 'flutter_test'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'packages', 'fuchsia_remote_debug_protocol'), tableData: bigqueryApi?.tabledata);
  await _pubRunTest(path.join(flutterRoot, 'dev', 'bots'), tableData: bigqueryApi?.tabledata);
  await _pubRunTest(path.join(flutterRoot, 'dev', 'devicelab'), tableData: bigqueryApi?.tabledata);
  await _pubRunTest(path.join(flutterRoot, 'dev', 'snippets'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'dev', 'integration_tests', 'android_semantics_testing'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'dev', 'manual_tests'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'dev', 'tools', 'vitool'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'examples', 'hello_world'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'examples', 'layers'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'examples', 'stocks'), tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'examples', 'flutter_gallery'), tableData: bigqueryApi?.tabledata);
  // Regression test to ensure that code outside of package:flutter can run
  // with --track-widget-creation.
  await _runFlutterTest(path.join(flutterRoot, 'examples', 'flutter_gallery'), options: <String>['--track-widget-creation'], tableData: bigqueryApi?.tabledata);
  await _runFlutterTest(path.join(flutterRoot, 'examples', 'catalog'), tableData: bigqueryApi?.tabledata);
  // Smoke test for code generation.
  await _runFlutterTest(path.join(flutterRoot, 'dev', 'integration_tests', 'codegen'), tableData: bigqueryApi?.tabledata, environment: <String, String>{
    'FLUTTER_EXPERIMENTAL_BUILD': 'true',
  });

  print('${bold}DONE: All tests successful.$reset');
}

Future<void> _runCoverage() async {
  final File coverageFile = File(path.join(flutterRoot, 'packages', 'flutter', 'coverage', 'lcov.info'));
  if (!coverageFile.existsSync()) {
    print('${red}Coverage file not found.$reset');
    print('Expected to find: ${coverageFile.absolute}');
    print('This file is normally obtained by running `flutter update-packages`.');
    exit(1);
  }
  coverageFile.deleteSync();
  await _runFlutterTest(path.join(flutterRoot, 'packages', 'flutter'),
    options: const <String>['--coverage'],
  );
  if (!coverageFile.existsSync()) {
    print('${red}Coverage file not found.$reset');
    print('Expected to find: ${coverageFile.absolute}');
    print('This file should have been generated by the `flutter test --coverage` script, but was not.');
    exit(1);
  }

  print('${bold}DONE: Coverage collection successful.$reset');
}

Future<void> _buildRunnerTest(
  String workingDirectory,
  String flutterRoot, {
  String testPath,
  bool enableFlutterToolAsserts = false,
  bq.TabledataResourceApi tableData,
}) async {
  final List<String> args = <String>['run', 'build_runner', 'test', '--', useFlutterTestFormatter ? '-rjson' : '-rcompact', '-j1'];
  if (!hasColor) {
    args.add('--no-color');
  }
  if (testPath != null) {
    args.add(testPath);
  }
  final Map<String, String> pubEnvironment = <String, String>{
    'FLUTTER_ROOT': flutterRoot,
  };
  if (Directory(pubCache).existsSync()) {
    pubEnvironment['PUB_CACHE'] = pubCache;
  }
  if (enableFlutterToolAsserts) {
    // If an existing env variable exists append to it, but only if
    // it doesn't appear to already include enable-asserts.
    String toolsArgs = Platform.environment['FLUTTER_TOOL_ARGS'] ?? '';
    if (!toolsArgs.contains('--enable-asserts'))
        toolsArgs += ' --enable-asserts';
    pubEnvironment['FLUTTER_TOOL_ARGS'] = toolsArgs.trim();
  }

  if (useFlutterTestFormatter) {
    final FlutterCompactFormatter formatter = FlutterCompactFormatter();
    final Stream<String> testOutput = runAndGetStdout(
      pub,
      args,
      workingDirectory: workingDirectory,
      environment: pubEnvironment,
      beforeExit: formatter.finish
    );
    await _processTestOutput(formatter, testOutput, tableData);
  } else {
    await runCommand(
      pub,
      args,
      workingDirectory:workingDirectory,
      environment:pubEnvironment,
    );
  }
}

Future<void> _pubRunTest(
  String workingDirectory, {
  String testPath,
  bool enableFlutterToolAsserts = false,
  bq.TabledataResourceApi tableData,
}) async {
  final List<String> args = <String>['run', 'test', useFlutterTestFormatter ? '-rjson' : '-rcompact', '-j1'];
  if (!hasColor)
    args.add('--no-color');
  if (testPath != null)
    args.add(testPath);
  final Map<String, String> pubEnvironment = <String, String>{};
  if (Directory(pubCache).existsSync()) {
    pubEnvironment['PUB_CACHE'] = pubCache;
  }
  if (enableFlutterToolAsserts) {
    // If an existing env variable exists append to it, but only if
    // it doesn't appear to already include enable-asserts.
    String toolsArgs = Platform.environment['FLUTTER_TOOL_ARGS'] ?? '';
    if (!toolsArgs.contains('--enable-asserts'))
        toolsArgs += ' --enable-asserts';
    pubEnvironment['FLUTTER_TOOL_ARGS'] = toolsArgs.trim();
  }
  if (useFlutterTestFormatter) {
    final FlutterCompactFormatter formatter = FlutterCompactFormatter();
    final Stream<String> testOutput = runAndGetStdout(
      pub,
      args,
      workingDirectory: workingDirectory,
      beforeExit: formatter.finish,
    );
    await _processTestOutput(formatter, testOutput, tableData);
  } else {
    await runCommand(
      pub,
      args,
      workingDirectory:workingDirectory,
    );
  }
}

enum CiProviders {
  cirrus,
  luci,
}

CiProviders _getCiProvider() {
  if (Platform.environment['CIRRUS_CI'] == 'true') {
    return CiProviders.cirrus;
  }
  if (Platform.environment['LUCI_CONTEXT'] != null) {
    return CiProviders.luci;
  }
  return null;
}

String _getCiProviderName() {
  switch(_getCiProvider()) {
    case CiProviders.cirrus:
      return 'cirrusci';
    case CiProviders.luci:
      return 'luci';
  }
  return 'unknown';
}

int _getPrNumber() {
  switch(_getCiProvider()) {
    case CiProviders.cirrus:
      return Platform.environment['CIRRUS_PR'] == null
          ? -1
          : int.tryParse(Platform.environment['CIRRUS_PR']);
    case CiProviders.luci:
      return -1; // LUCI doesn't know about this.
  }
  return -1;
}

Future<String> _getAuthors() async {
  final String exe = Platform.isWindows ? '.exe' : '';
  final String author = await runAndGetStdout(
    'git$exe', <String>['log', _getGitHash(), '--pretty="%an <%ae>"'],
    workingDirectory: flutterRoot,
  ).first;
  return author;
}

String _getCiUrl() {
  switch(_getCiProvider()) {
    case CiProviders.cirrus:
      return 'https://cirrus-ci.com/task/${Platform.environment['CIRRUS_TASK_ID']}';
    case CiProviders.luci:
      return 'https://ci.chromium.org/p/flutter/g/framework/console'; // TODO(dnfield): can we get a direct link to the actual build?
  }
  return '';
}

String _getGitHash() {
  switch(_getCiProvider()) {
    case CiProviders.cirrus:
      return Platform.environment['CIRRUS_CHANGE_IN_REPO'];
    case CiProviders.luci:
      return 'HEAD'; // TODO(dnfield): Set this in the env for LUCI.
  }
  return '';
}

Future<void> _processTestOutput(
  FlutterCompactFormatter formatter,
  Stream<String> testOutput,
  bq.TabledataResourceApi tableData,
) async {
  final Timer heartbeat = Timer.periodic(const Duration(seconds: 30), (Timer timer) {
    print('Processing...');
  });

  await testOutput.forEach(formatter.processRawOutput);
  heartbeat.cancel();
  formatter.finish();
  if (tableData == null || formatter.tests.isEmpty) {
    return;
  }
  final bq.TableDataInsertAllRequest request = bq.TableDataInsertAllRequest();
  final String authors = await _getAuthors();
  request.rows = List<bq.TableDataInsertAllRequestRows>.from(
    formatter.tests.map<bq.TableDataInsertAllRequestRows>((TestResult result) =>
      bq.TableDataInsertAllRequestRows.fromJson(<String, dynamic> {
        'json': <String, dynamic>{
          'source': <String, dynamic>{
            'provider': _getCiProviderName(),
            'url': _getCiUrl(),
            'platform': <String, dynamic>{
              'os': Platform.operatingSystem,
              'version': Platform.operatingSystemVersion,
            },
          },
          'test': <String, dynamic>{
            'name': result.name,
            'result': result.status.toString(),
            'file': result.path,
            'line': result.line,
            'column': result.column,
            'time': result.totalTime,
          },
          'git': <String, dynamic>{
            'author': authors,
            'pull_request': _getPrNumber(),
            'commit': _getGitHash(),
            'organization': 'flutter',
            'repository': 'flutter',
          },
          'error': result.status != TestStatus.failed ? null : <String, dynamic>{
            'message': result.errorMessage,
            'stack_trace': result.stackTrace,
          },
          'information': result.messages,
        },
      }),
    ),
    growable: false,
  );
  final bq.TableDataInsertAllResponse response = await tableData.insertAll(request, 'flutter-infra', 'tests', 'ci');
  if (response.insertErrors != null && response.insertErrors.isNotEmpty) {
    print('${red}BigQuery insert errors:');
    print(response.toJson());
    print(reset);
  }
}

class EvalResult {
  EvalResult({
    this.stdout,
    this.stderr,
    this.exitCode = 0,
  });

  final String stdout;
  final String stderr;
  final int exitCode;
}

Future<void> _runFlutterTest(String workingDirectory, {
  String script,
  bool expectFailure = false,
  bool printOutput = true,
  List<String> options = const <String>[],
  bool skip = false,
  Duration timeout = _kLongTimeout,
  bq.TabledataResourceApi tableData,
  Map<String, String> environment,
}) async {
  final List<String> args = <String>['test']..addAll(options);
  if (flutterTestArgs != null && flutterTestArgs.isNotEmpty)
    args.addAll(flutterTestArgs);

  final bool shouldProcessOutput = useFlutterTestFormatter && !expectFailure && !options.contains('--coverage');
  if (shouldProcessOutput) {
    args.add('--machine');
  }

  if (script != null) {
    final String fullScriptPath = path.join(workingDirectory, script);
    if (!FileSystemEntity.isFileSync(fullScriptPath)) {
      print('Could not find test: $fullScriptPath');
      print('Working directory: $workingDirectory');
      print('Script: $script');
      if (!printOutput)
        print('This is one of the tests that does not normally print output.');
      if (skip)
        print('This is one of the tests that is normally skipped in this configuration.');
      exit(1);
    }
    args.add(script);
  }
  if (!shouldProcessOutput) {
    return runCommand(flutter, args,
      workingDirectory: workingDirectory,
      expectNonZeroExit: expectFailure,
      printOutput: printOutput,
      skip: skip,
      timeout: timeout,
      environment: environment,
    );
  }

  if (useFlutterTestFormatter) {
  final FlutterCompactFormatter formatter = FlutterCompactFormatter();
  final Stream<String> testOutput = runAndGetStdout(
    flutter,
    args,
    workingDirectory: workingDirectory,
    expectNonZeroExit: expectFailure,
    timeout: timeout,
    beforeExit: formatter.finish,
    environment: environment,
  );
  await _processTestOutput(formatter, testOutput, tableData);
  } else {
    await runCommand(
      flutter,
      args,
      workingDirectory: workingDirectory,
      expectNonZeroExit: expectFailure,
      timeout: timeout,
    );
  }
}

Future<void> _verifyVersion(String filename) async {
  if (!File(filename).existsSync()) {
    print('$redLine');
    print('The version logic failed to create the Flutter version file.');
    print('$redLine');
    exit(1);
  }
  final String version = await File(filename).readAsString();
  if (version == '0.0.0-unknown') {
    print('$redLine');
    print('The version logic failed to determine the Flutter version.');
    print('$redLine');
    exit(1);
  }
  final RegExp pattern = RegExp(r'^[0-9]+\.[0-9]+\.[0-9]+(-pre\.[0-9]+)?$');
  if (!version.contains(pattern)) {
    print('$redLine');
    print('The version logic generated an invalid version string.');
    print('$redLine');
    exit(1);
  }
}

Future<void> _runIntegrationTests() async {
  print('Platform env vars:');

  await _runDevicelabTest('dartdocs');

  if (Platform.isLinux) {
    await _runDevicelabTest('flutter_create_offline_test_linux');
  } else if (Platform.isWindows) {
    await _runDevicelabTest('flutter_create_offline_test_windows');
  } else if (Platform.isMacOS) {
    await _runDevicelabTest('flutter_create_offline_test_mac');
    await _runDevicelabTest('module_test_ios');
  }
  await _integrationTestsAndroidSdk();
}

Future<void> _runDevicelabTest(String testName, {Map<String, String> env}) async {
  await runCommand(
    dart,
    <String>['bin/run.dart', '-t', testName],
    workingDirectory: path.join(flutterRoot, 'dev', 'devicelab'),
    environment: env,
  );
}

Future<void> _integrationTestsAndroidSdk() async {
  final String androidSdkRoot = (Platform.environment['ANDROID_HOME']?.isEmpty ?? true)
      ? Platform.environment['ANDROID_SDK_ROOT']
      : Platform.environment['ANDROID_HOME'];
  if (androidSdkRoot == null || androidSdkRoot.isEmpty) {
    print('No Android SDK detected, skipping Android Integration Tests');
    return;
  }

  final Map<String, String> env = <String, String> {
    'ANDROID_HOME': androidSdkRoot,
    'ANDROID_SDK_ROOT': androidSdkRoot,
  };

  // TODO(dnfield): gradlew is crashing on the cirrus image and it's not clear why.
  if (!Platform.isWindows) {
    await _runDevicelabTest('gradle_plugin_test', env: env);
    await _runDevicelabTest('module_test', env: env);
  }
  // note: this also covers plugin_test_win as long as Windows has an Android SDK available.
  await _runDevicelabTest('plugin_test', env: env);
}