// Copyright 2013 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:convert';
import 'dart:io' as io;

import 'package:file/file.dart';
import 'package:path/path.dart' as p;

import 'common/core.dart';
import 'common/package_looping_command.dart';
import 'common/plugin_utils.dart';
import 'common/process_runner.dart';

const String _kiOSDestination = 'ios-destination';
const String _kXcodeBuildCommand = 'xcodebuild';
const String _kXCRunCommand = 'xcrun';
const String _kFoundNoSimulatorsMessage =
    'Cannot find any available simulators, tests failed';

const int _exitFindingSimulatorsFailed = 3;
const int _exitNoSimulators = 4;

/// The command to run XCTests (XCUnitTest and XCUITest) in plugins.
/// The tests target have to be added to the Xcode project of the example app,
/// usually at "example/{ios,macos}/Runner.xcworkspace".
///
/// The static analyzer is also run.
class XCTestCommand extends PackageLoopingCommand {
  /// Creates an instance of the test command.
  XCTestCommand(
    Directory packagesDir, {
    ProcessRunner processRunner = const ProcessRunner(),
  }) : super(packagesDir, processRunner: processRunner) {
    argParser.addOption(
      _kiOSDestination,
      help:
          'Specify the destination when running the test, used for -destination flag for xcodebuild command.\n'
          'this is passed to the `-destination` argument in xcodebuild command.\n'
          'See https://developer.apple.com/library/archive/technotes/tn2339/_index.html#//apple_ref/doc/uid/DTS40014588-CH1-UNIT for details on how to specify the destination.',
    );
    argParser.addFlag(kPlatformIos, help: 'Runs the iOS tests');
    argParser.addFlag(kPlatformMacos, help: 'Runs the macOS tests');
  }

  // The device destination flags for iOS tests.
  List<String> _iosDestinationFlags = <String>[];

  @override
  final String name = 'xctest';

  @override
  final String description =
      'Runs the xctests in the iOS and/or macOS example apps.\n\n'
      'This command requires "flutter" and "xcrun" to be in your path.';

  @override
  String get failureListHeader => 'The following packages are failing XCTests:';

  @override
  Future<void> initializeRun() async {
    final bool shouldTestIos = getBoolArg(kPlatformIos);
    final bool shouldTestMacos = getBoolArg(kPlatformMacos);

    if (!(shouldTestIos || shouldTestMacos)) {
      printError('At least one platform flag must be provided.');
      throw ToolExit(exitInvalidArguments);
    }

    if (shouldTestIos) {
      String destination = getStringArg(_kiOSDestination);
      if (destination.isEmpty) {
        final String? simulatorId = await _findAvailableIphoneSimulator();
        if (simulatorId == null) {
          printError(_kFoundNoSimulatorsMessage);
          throw ToolExit(_exitNoSimulators);
        }
        destination = 'id=$simulatorId';
      }
      _iosDestinationFlags = <String>[
        '-destination',
        destination,
      ];
    }
  }

  @override
  Future<List<String>> runForPackage(Directory package) async {
    final List<String> failures = <String>[];
    final bool testIos = getBoolArg(kPlatformIos);
    final bool testMacos = getBoolArg(kPlatformMacos);
    // Only provide the failing platform(s) in the summary if testing multiple
    // platforms, otherwise it's just noise.
    final bool provideErrorDetails = testIos && testMacos;

    if (testIos &&
        !await _testPlugin(package, 'iOS',
            extraXcrunFlags: _iosDestinationFlags)) {
      failures.add(provideErrorDetails ? 'iOS' : '');
    }
    if (testMacos && !await _testPlugin(package, 'macOS')) {
      failures.add(provideErrorDetails ? 'macOS' : '');
    }
    return failures;
  }

  /// Runs all applicable tests for [plugin], printing status and returning
  /// success if the tests passed (or did not exist).
  Future<bool> _testPlugin(
    Directory plugin,
    String platform, {
    List<String> extraXcrunFlags = const <String>[],
  }) async {
    if (!pluginSupportsPlatform(platform.toLowerCase(), plugin,
        requiredMode: PlatformSupport.inline)) {
      printSkip('$platform is not implemented by this plugin package.\n');
      return true;
    }
    bool passing = true;
    for (final Directory example in getExamplesForPlugin(plugin)) {
      // Running tests and static analyzer.
      final String examplePath =
          p.relative(example.path, from: plugin.parent.path);
      print('Running $platform tests and analyzer for $examplePath...');
      int exitCode =
          await _runTests(true, example, platform, extraFlags: extraXcrunFlags);
      // 66 = there is no test target (this fails fast). Try again with just the analyzer.
      if (exitCode == 66) {
        print('Tests not found for $examplePath, running analyzer only...');
        exitCode = await _runTests(false, example, platform,
            extraFlags: extraXcrunFlags);
      }
      if (exitCode == 0) {
        printSuccess('Successfully ran $platform xctest for $examplePath');
      } else {
        passing = false;
      }
    }
    return passing;
  }

  Future<int> _runTests(
    bool runTests,
    Directory example,
    String platform, {
    List<String> extraFlags = const <String>[],
  }) {
    final List<String> xctestArgs = <String>[
      _kXcodeBuildCommand,
      if (runTests) 'test',
      'analyze',
      '-workspace',
      '${platform.toLowerCase()}/Runner.xcworkspace',
      '-configuration',
      'Debug',
      '-scheme',
      'Runner',
      ...extraFlags,
      'GCC_TREAT_WARNINGS_AS_ERRORS=YES',
    ];
    final String completeTestCommand =
        '$_kXCRunCommand ${xctestArgs.join(' ')}';
    print(completeTestCommand);
    return processRunner.runAndStream(_kXCRunCommand, xctestArgs,
        workingDir: example, exitOnError: false);
  }

  Future<String?> _findAvailableIphoneSimulator() async {
    // Find the first available destination if not specified.
    final List<String> findSimulatorsArguments = <String>[
      'simctl',
      'list',
      '--json'
    ];
    final String findSimulatorCompleteCommand =
        '$_kXCRunCommand ${findSimulatorsArguments.join(' ')}';
    print('Looking for available simulators...');
    print(findSimulatorCompleteCommand);
    final io.ProcessResult findSimulatorsResult =
        await processRunner.run(_kXCRunCommand, findSimulatorsArguments);
    if (findSimulatorsResult.exitCode != 0) {
      printError(
          'Error occurred while running "$findSimulatorCompleteCommand":\n'
          '${findSimulatorsResult.stderr}');
      throw ToolExit(_exitFindingSimulatorsFailed);
    }
    final Map<String, dynamic> simulatorListJson =
        jsonDecode(findSimulatorsResult.stdout as String)
            as Map<String, dynamic>;
    final List<Map<String, dynamic>> runtimes =
        (simulatorListJson['runtimes'] as List<dynamic>)
            .cast<Map<String, dynamic>>();
    final Map<String, Object> devices =
        (simulatorListJson['devices'] as Map<String, dynamic>)
            .cast<String, Object>();
    if (runtimes.isEmpty || devices.isEmpty) {
      return null;
    }
    String? id;
    // Looking for runtimes, trying to find one with highest OS version.
    for (final Map<String, dynamic> rawRuntimeMap in runtimes.reversed) {
      final Map<String, Object> runtimeMap =
          rawRuntimeMap.cast<String, Object>();
      if ((runtimeMap['name'] as String?)?.contains('iOS') != true) {
        continue;
      }
      final String? runtimeID = runtimeMap['identifier'] as String?;
      if (runtimeID == null) {
        continue;
      }
      final List<Map<String, dynamic>>? devicesForRuntime =
          (devices[runtimeID] as List<dynamic>?)?.cast<Map<String, dynamic>>();
      if (devicesForRuntime == null || devicesForRuntime.isEmpty) {
        continue;
      }
      // Looking for runtimes, trying to find latest version of device.
      for (final Map<String, dynamic> rawDevice in devicesForRuntime.reversed) {
        final Map<String, Object> device = rawDevice.cast<String, Object>();
        if (device['availabilityError'] != null ||
            (device['isAvailable'] as bool?) == false) {
          continue;
        }
        id = device['udid'] as String?;
        if (id == null) {
          continue;
        }
        print('device selected: $device');
        return id;
      }
    }
    return null;
  }
}