// 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.

import 'artifacts.dart';
import 'base/error_handling_io.dart';
import 'base/file_system.dart';
import 'base/utils.dart';
import 'build_info.dart';
import 'bundle.dart' as bundle;
import 'flutter_plugins.dart';
import 'globals_null_migrated.dart' as globals;
import 'ios/plist_parser.dart';
import 'ios/xcode_build_settings.dart' as xcode;
import 'ios/xcodeproj.dart';
import 'platform_plugins.dart';
import 'project.dart';
import 'template.dart';

/// Represents an Xcode-based sub-project.
///
/// This defines interfaces common to iOS and macOS projects.
abstract class XcodeBasedProject {
  /// The parent of this project.
  FlutterProject get parent;

  /// Whether the subproject (either iOS or macOS) exists in the Flutter project.
  bool existsSync();

  /// The Xcode project (.xcodeproj directory) of the host app.
  Directory get xcodeProject;

  /// The 'project.pbxproj' file of [xcodeProject].
  File get xcodeProjectInfoFile;

  /// The Xcode workspace (.xcworkspace directory) of the host app.
  Directory get xcodeWorkspace;

  /// Contains definitions for FLUTTER_ROOT, LOCAL_ENGINE, and more flags for
  /// the Xcode build.
  File get generatedXcodePropertiesFile;

  /// The Flutter-managed Xcode config file for [mode].
  File xcodeConfigFor(String mode);

  /// The script that exports environment variables needed for Flutter tools.
  /// Can be run first in a Xcode Script build phase to make FLUTTER_ROOT,
  /// LOCAL_ENGINE, and other Flutter variables available to any flutter
  /// tooling (`flutter build`, etc) to convert into flags.
  File get generatedEnvironmentVariableExportScript;

  /// The CocoaPods 'Podfile'.
  File get podfile;

  /// The CocoaPods 'Podfile.lock'.
  File get podfileLock;

  /// The CocoaPods 'Manifest.lock'.
  File get podManifestLock;
}

/// Represents the iOS sub-project of a Flutter project.
///
/// Instances will reflect the contents of the `ios/` sub-folder of
/// Flutter applications and the `.ios/` sub-folder of Flutter module projects.
class IosProject extends FlutterProjectPlatform implements XcodeBasedProject {
  IosProject.fromFlutter(this.parent);

  @override
  final FlutterProject parent;

  @override
  String get pluginConfigKey => IOSPlugin.kConfigKey;

  static final RegExp _productBundleIdPattern = RegExp(r'''^\s*PRODUCT_BUNDLE_IDENTIFIER\s*=\s*(["']?)(.*?)\1;\s*$''');
  static const String _productBundleIdVariable = r'$(PRODUCT_BUNDLE_IDENTIFIER)';
  static const String _hostAppProjectName = 'Runner';

  Directory get ephemeralModuleDirectory => parent.directory.childDirectory('.ios');
  Directory get _editableDirectory => parent.directory.childDirectory('ios');

  /// This parent folder of `Runner.xcodeproj`.
  Directory get hostAppRoot {
    if (!isModule || _editableDirectory.existsSync()) {
      return _editableDirectory;
    }
    return ephemeralModuleDirectory;
  }

  /// The root directory of the iOS wrapping of Flutter and plugins. This is the
  /// parent of the `Flutter/` folder into which Flutter artifacts are written
  /// during build.
  ///
  /// This is the same as [hostAppRoot] except when the project is
  /// a Flutter module with an editable host app.
  Directory get _flutterLibRoot => isModule ? ephemeralModuleDirectory : _editableDirectory;

  /// True, if the parent Flutter project is a module project.
  bool get isModule => parent.isModule;

  /// Whether the flutter application has an iOS project.
  bool get exists => hostAppRoot.existsSync();

  /// Put generated files here.
  Directory get ephemeralDirectory => _flutterLibRoot.childDirectory('Flutter').childDirectory('ephemeral');

  @override
  File xcodeConfigFor(String mode) => _flutterLibRoot.childDirectory('Flutter').childFile('$mode.xcconfig');

  @override
  File get generatedEnvironmentVariableExportScript => _flutterLibRoot.childDirectory('Flutter').childFile('flutter_export_environment.sh');

  @override
  File get podfile => hostAppRoot.childFile('Podfile');

  @override
  File get podfileLock => hostAppRoot.childFile('Podfile.lock');

  @override
  File get podManifestLock => hostAppRoot.childDirectory('Pods').childFile('Manifest.lock');

  /// The default 'Info.plist' file of the host app. The developer can change this location in Xcode.
  File get defaultHostInfoPlist => hostAppRoot.childDirectory(_hostAppProjectName).childFile('Info.plist');

  File get appFrameworkInfoPlist => _flutterLibRoot.childDirectory('Flutter').childFile('AppFrameworkInfo.plist');

  Directory get symlinks => _flutterLibRoot.childDirectory('.symlinks');

  @override
  Directory get xcodeProject => hostAppRoot.childDirectory('$_hostAppProjectName.xcodeproj');

  @override
  File get xcodeProjectInfoFile => xcodeProject.childFile('project.pbxproj');

  File get xcodeProjectWorkspaceData =>
    xcodeProject
    .childDirectory('project.xcworkspace')
    .childFile('contents.xcworkspacedata');

  @override
  Directory get xcodeWorkspace => hostAppRoot.childDirectory('$_hostAppProjectName.xcworkspace');

  /// Xcode workspace shared data directory for the host app.
  Directory get xcodeWorkspaceSharedData => xcodeWorkspace.childDirectory('xcshareddata');

  /// Xcode workspace shared workspace settings file for the host app.
  File get xcodeWorkspaceSharedSettings => xcodeWorkspaceSharedData.childFile('WorkspaceSettings.xcsettings');

  @override
  bool existsSync()  {
    return parent.isModule || _editableDirectory.existsSync();
  }

  /// The product bundle identifier of the host app, or null if not set or if
  /// iOS tooling needed to read it is not installed.
  Future<String?> productBundleIdentifier(BuildInfo? buildInfo) async {
    if (!existsSync()) {
      return null;
    }
    return _productBundleIdentifier ??= await _parseProductBundleIdentifier(buildInfo);
  }
  String? _productBundleIdentifier;

  Future<String?> _parseProductBundleIdentifier(BuildInfo? buildInfo) async {
    String? fromPlist;
    final File defaultInfoPlist = defaultHostInfoPlist;
    // Users can change the location of the Info.plist.
    // Try parsing the default, first.
    if (defaultInfoPlist.existsSync()) {
      try {
        fromPlist = globals.plistParser.getValueFromFile(
          defaultHostInfoPlist.path,
          PlistParser.kCFBundleIdentifierKey,
        );
      } on FileNotFoundException {
        // iOS tooling not found; likely not running OSX; let [fromPlist] be null
      }
      if (fromPlist != null && !fromPlist.contains(r'$')) {
        // Info.plist has no build variables in product bundle ID.
        return fromPlist;
      }
    }
    final Map<String, String>? allBuildSettings = await buildSettingsForBuildInfo(buildInfo);
    if (allBuildSettings != null) {
      if (fromPlist != null) {
        // Perform variable substitution using build settings.
        return substituteXcodeVariables(fromPlist, allBuildSettings);
      }
      return allBuildSettings['PRODUCT_BUNDLE_IDENTIFIER'];
    }

    // On non-macOS platforms, parse the first PRODUCT_BUNDLE_IDENTIFIER from
    // the project file. This can return the wrong bundle identifier if additional
    // bundles have been added to the project and are found first, like frameworks
    // or companion watchOS projects. However, on non-macOS platforms this is
    // only used for display purposes and to regenerate organization names, so
    // best-effort is probably fine.
    final String? fromPbxproj = firstMatchInFile(xcodeProjectInfoFile, _productBundleIdPattern)?.group(2);
    if (fromPbxproj != null && (fromPlist == null || fromPlist == _productBundleIdVariable)) {
      return fromPbxproj;
    }

    return null;
  }

  /// The bundle name of the host app, `My App.app`.
  Future<String?> hostAppBundleName(BuildInfo buildInfo) async {
    if (!existsSync()) {
      return null;
    }
    return _hostAppBundleName ??= await _parseHostAppBundleName(buildInfo);
  }
  String? _hostAppBundleName;

  Future<String> _parseHostAppBundleName(BuildInfo buildInfo) async {
    // The product name and bundle name are derived from the display name, which the user
    // is instructed to change in Xcode as part of deploying to the App Store.
    // https://flutter.dev/docs/deployment/ios#review-xcode-project-settings
    // The only source of truth for the name is Xcode's interpretation of the build settings.
    String? productName;
    if (globals.xcodeProjectInterpreter?.isInstalled == true) {
      final Map<String, String>? xcodeBuildSettings = await buildSettingsForBuildInfo(buildInfo);
      if (xcodeBuildSettings != null) {
        productName = xcodeBuildSettings['FULL_PRODUCT_NAME'];
      }
    }
    if (productName == null) {
      globals.printTrace('FULL_PRODUCT_NAME not present, defaulting to $_hostAppProjectName');
    }
    return productName ?? '$_hostAppProjectName.app';
  }

  /// The build settings for the host app of this project, as a detached map.
  ///
  /// Returns null, if iOS tooling is unavailable.
  Future<Map<String, String>?> buildSettingsForBuildInfo(BuildInfo? buildInfo, { EnvironmentType environmentType = EnvironmentType.physical }) async {
    if (!existsSync()) {
      return null;
    }
    final XcodeProjectInfo? info = await projectInfo();
    if (info == null) {
      return null;
    }

    final String? scheme = info.schemeFor(buildInfo);
    if (scheme == null) {
      info.reportFlavorNotFoundAndExit();
    }

    final String? configuration = (await projectInfo())?.buildConfigurationFor(
      buildInfo,
      scheme,
    );
    final XcodeProjectBuildContext buildContext = XcodeProjectBuildContext(environmentType: environmentType, scheme: scheme, configuration: configuration);
    final Map<String, String>? currentBuildSettings = _buildSettingsByBuildContext[buildContext];
    if (currentBuildSettings == null) {
      final Map<String, String>? calculatedBuildSettings = await _xcodeProjectBuildSettings(buildContext);
      if (calculatedBuildSettings != null) {
        _buildSettingsByBuildContext[buildContext] = calculatedBuildSettings;
      }
    }
    return _buildSettingsByBuildContext[buildContext];
  }

  final Map<XcodeProjectBuildContext, Map<String, String>> _buildSettingsByBuildContext = <XcodeProjectBuildContext, Map<String, String>>{};

  Future<XcodeProjectInfo?> projectInfo() async {
    final XcodeProjectInterpreter? xcodeProjectInterpreter = globals.xcodeProjectInterpreter;
    if (!xcodeProject.existsSync() || xcodeProjectInterpreter == null || !xcodeProjectInterpreter.isInstalled) {
      return null;
    }
    return _projectInfo ??= await xcodeProjectInterpreter.getInfo(hostAppRoot.path);
  }
  XcodeProjectInfo? _projectInfo;

  Future<Map<String, String>?> _xcodeProjectBuildSettings(XcodeProjectBuildContext buildContext) async {
    final XcodeProjectInterpreter? xcodeProjectInterpreter = globals.xcodeProjectInterpreter;
    if (xcodeProjectInterpreter == null || !xcodeProjectInterpreter.isInstalled) {
      return null;
    }

    final Map<String, String> buildSettings = await xcodeProjectInterpreter.getBuildSettings(
      xcodeProject.path,
      buildContext: buildContext,
    );
    if (buildSettings != null && buildSettings.isNotEmpty) {
      // No timeouts, flakes, or errors.
      return buildSettings;
    }
    return null;
  }

  Future<void> ensureReadyForPlatformSpecificTooling() async {
    await _regenerateFromTemplateIfNeeded();
    if (!_flutterLibRoot.existsSync()) {
      return;
    }
    await _updateGeneratedXcodeConfigIfNeeded();
  }

  /// Check if one the [targets] of the project is a watchOS companion app target.
  Future<bool> containsWatchCompanion(List<String> targets, BuildInfo buildInfo) async {
    final String? bundleIdentifier = await productBundleIdentifier(buildInfo);
    // A bundle identifier is required for a companion app.
    if (bundleIdentifier == null) {
      return false;
    }
    for (final String target in targets) {
      // Create Info.plist file of the target.
      final File infoFile = hostAppRoot.childDirectory(target).childFile('Info.plist');
      // The Info.plist file of a target contains the key WKCompanionAppBundleIdentifier,
      // if it is a watchOS companion app.
      if (infoFile.existsSync()) {
        final String? fromPlist = globals.plistParser.getValueFromFile(infoFile.path, 'WKCompanionAppBundleIdentifier');
        if (bundleIdentifier == fromPlist) {
          return true;
        }

        // The key WKCompanionAppBundleIdentifier might contain an xcode variable
        // that needs to be substituted before comparing it with bundle id
        if (fromPlist != null && fromPlist.contains(r'$')) {
          final Map<String, String>? allBuildSettings = await buildSettingsForBuildInfo(buildInfo);
          if (allBuildSettings != null) {
            final String substituedVariable = substituteXcodeVariables(fromPlist, allBuildSettings);
            if (substituedVariable == bundleIdentifier) {
              return true;
            }
          }
        }
      }
    }
    return false;
  }

  Future<void> _updateGeneratedXcodeConfigIfNeeded() async {
    if (globals.cache.isOlderThanToolsStamp(generatedXcodePropertiesFile)) {
      await xcode.updateGeneratedXcodeProperties(
        project: parent,
        buildInfo: BuildInfo.debug,
        targetOverride: bundle.defaultMainPath,
      );
    }
  }

  Future<void> _regenerateFromTemplateIfNeeded() async {
    if (!isModule) {
      return;
    }
    final bool pubspecChanged = globals.fsUtils.isOlderThanReference(
      entity: ephemeralModuleDirectory,
      referenceFile: parent.pubspecFile,
    );
    final bool toolingChanged = globals.cache.isOlderThanToolsStamp(ephemeralModuleDirectory);
    if (!pubspecChanged && !toolingChanged) {
      return;
    }

    ErrorHandlingFileSystem.deleteIfExists(ephemeralModuleDirectory, recursive: true);
    await _overwriteFromTemplate(
      globals.fs.path.join('module', 'ios', 'library'),
      ephemeralModuleDirectory,
    );
    // Add ephemeral host app, if a editable host app does not already exist.
    if (!_editableDirectory.existsSync()) {
      await _overwriteFromTemplate(
        globals.fs.path.join('module', 'ios', 'host_app_ephemeral'),
        ephemeralModuleDirectory,
      );
      if (hasPlugins(parent)) {
        await _overwriteFromTemplate(
          globals.fs.path.join('module', 'ios', 'host_app_ephemeral_cocoapods'),
          ephemeralModuleDirectory,
        );
      }
      // Use release mode so host project can link on bitcode variant.
      _copyEngineArtifactToProject(BuildMode.release, EnvironmentType.physical);
    }
  }

  void _copyEngineArtifactToProject(BuildMode mode, EnvironmentType environmentType) {
    // Copy framework from engine cache. The actual build mode
    // doesn't actually matter as it will be overwritten by xcode_backend.sh.
    // However, cocoapods will run before that script and requires something
    // to be in this location.
    final Directory framework = globals.fs.directory(
      globals.artifacts?.getArtifactPath(
        Artifact.flutterXcframework,
        platform: TargetPlatform.ios,
        mode: mode,
        environmentType: environmentType,
      )
    );
    if (framework.existsSync()) {
      copyDirectory(
        framework,
        engineCopyDirectory.childDirectory('Flutter.xcframework'),
      );
    }
  }

  @override
  File get generatedXcodePropertiesFile => _flutterLibRoot
    .childDirectory('Flutter')
    .childFile('Generated.xcconfig');

  /// No longer compiled to this location.
  ///
  /// Used only for "flutter clean" to remove old references.
  Directory get deprecatedCompiledDartFramework => _flutterLibRoot
      .childDirectory('Flutter')
      .childDirectory('App.framework');

  /// No longer copied to this location.
  ///
  /// Used only for "flutter clean" to remove old references.
  Directory get deprecatedProjectFlutterFramework => _flutterLibRoot
      .childDirectory('Flutter')
      .childDirectory('Flutter.framework');

  /// Used only for "flutter clean" to remove old references.
  File get flutterPodspec => _flutterLibRoot
      .childDirectory('Flutter')
      .childFile('Flutter.podspec');

  Directory get pluginRegistrantHost {
    return isModule
        ? _flutterLibRoot
            .childDirectory('Flutter')
            .childDirectory('FlutterPluginRegistrant')
        : hostAppRoot.childDirectory(_hostAppProjectName);
  }

  File get pluginRegistrantHeader {
    final Directory registryDirectory = isModule ? pluginRegistrantHost.childDirectory('Classes') : pluginRegistrantHost;
    return registryDirectory.childFile('GeneratedPluginRegistrant.h');
  }

  File get pluginRegistrantImplementation {
    final Directory registryDirectory = isModule ? pluginRegistrantHost.childDirectory('Classes') : pluginRegistrantHost;
    return registryDirectory.childFile('GeneratedPluginRegistrant.m');
  }

  Directory get engineCopyDirectory {
    return isModule
        ? ephemeralModuleDirectory.childDirectory('Flutter').childDirectory('engine')
        : hostAppRoot.childDirectory('Flutter');
  }

  Future<void> _overwriteFromTemplate(String path, Directory target) async {
    final Template template = await Template.fromName(
      path,
      fileSystem: globals.fs,
      templateManifest: null,
      logger: globals.logger,
      templateRenderer: globals.templateRenderer,
    );
    final String iosBundleIdentifier = parent.manifest.iosBundleIdentifier ?? 'com.example.${parent.manifest.appName}';
    template.render(
      target,
      <String, Object>{
        'ios': true,
        'projectName': parent.manifest.appName,
        'iosIdentifier': iosBundleIdentifier,
      },
      printStatusWhenWriting: false,
      overwriteExisting: true,
    );
  }
}

/// The macOS sub project.
class MacOSProject extends FlutterProjectPlatform implements XcodeBasedProject {
  MacOSProject.fromFlutter(this.parent);

  @override
  final FlutterProject parent;

  @override
  String get pluginConfigKey => MacOSPlugin.kConfigKey;

  static const String _hostAppProjectName = 'Runner';

  @override
  bool existsSync() => _macOSDirectory.existsSync();

  Directory get _macOSDirectory => parent.directory.childDirectory('macos');

  /// The directory in the project that is managed by Flutter. As much as
  /// possible, files that are edited by Flutter tooling after initial project
  /// creation should live here.
  Directory get managedDirectory => _macOSDirectory.childDirectory('Flutter');

  /// The subdirectory of [managedDirectory] that contains files that are
  /// generated on the fly. All generated files that are not intended to be
  /// checked in should live here.
  Directory get ephemeralDirectory => managedDirectory.childDirectory('ephemeral');

  /// The xcfilelist used to track the inputs for the Flutter script phase in
  /// the Xcode build.
  File get inputFileList => ephemeralDirectory.childFile('FlutterInputs.xcfilelist');

  /// The xcfilelist used to track the outputs for the Flutter script phase in
  /// the Xcode build.
  File get outputFileList => ephemeralDirectory.childFile('FlutterOutputs.xcfilelist');

  @override
  File get generatedXcodePropertiesFile => ephemeralDirectory.childFile('Flutter-Generated.xcconfig');

  @override
  File xcodeConfigFor(String mode) => managedDirectory.childFile('Flutter-$mode.xcconfig');

  @override
  File get generatedEnvironmentVariableExportScript => ephemeralDirectory.childFile('flutter_export_environment.sh');

  @override
  File get podfile => _macOSDirectory.childFile('Podfile');

  @override
  File get podfileLock => _macOSDirectory.childFile('Podfile.lock');

  @override
  File get podManifestLock => _macOSDirectory.childDirectory('Pods').childFile('Manifest.lock');

  @override
  Directory get xcodeProject => _macOSDirectory.childDirectory('$_hostAppProjectName.xcodeproj');

  @override
  File get xcodeProjectInfoFile => xcodeProject.childFile('project.pbxproj');

  @override
  Directory get xcodeWorkspace => _macOSDirectory.childDirectory('$_hostAppProjectName.xcworkspace');

  /// The file where the Xcode build will write the name of the built app.
  ///
  /// Ideally this will be replaced in the future with inspection of the Runner
  /// scheme's target.
  File get nameFile => ephemeralDirectory.childFile('.app_filename');

  Future<void> ensureReadyForPlatformSpecificTooling() async {
    // TODO(stuartmorgan): Add create-from-template logic here.
    await _updateGeneratedXcodeConfigIfNeeded();
  }

  Future<void> _updateGeneratedXcodeConfigIfNeeded() async {
    if (globals.cache.isOlderThanToolsStamp(generatedXcodePropertiesFile)) {
      await xcode.updateGeneratedXcodeProperties(
        project: parent,
        buildInfo: BuildInfo.debug,
        useMacOSConfig: true,
      );
    }
  }
}