// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as Common from '../../core/common/common.js';
import * as Host from '../../core/host/host.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as Platform from '../../core/platform/platform.js';

import type {FilesChangedData} from './FileSystemWorkspaceBinding.js';
import {IsolatedFileSystem} from './IsolatedFileSystem.js';
import {
  Events as PlatformFileSystemEvents,
  type PlatformFileSystem,
  PlatformFileSystemType
} from './PlatformFileSystem.js';

const UIStrings = {
  /**
   * @description Text in Isolated File System Manager of the Workspace settings in Settings
   * @example {folder does not exist} PH1
   */
  unableToAddFilesystemS: 'Unable to add filesystem: {PH1}',
} as const;
const str_ = i18n.i18n.registerUIStrings('models/persistence/IsolatedFileSystemManager.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
let isolatedFileSystemManagerInstance: IsolatedFileSystemManager|null;

export class IsolatedFileSystemManager extends Common.ObjectWrapper.ObjectWrapper<EventTypes> {
  readonly #fileSystems: Map<Platform.DevToolsPath.UrlString, PlatformFileSystem>;
  private readonly callbacks: Map<number, (arg0: Platform.DevToolsPath.RawPathString[]) => void>;
  private readonly progresses: Map<number, Common.Progress.Progress>;
  readonly #workspaceFolderExcludePatternSetting: Common.Settings.RegExpSetting;
  private fileSystemRequestResolve: ((arg0: IsolatedFileSystem|null) => void)|null;
  private readonly fileSystemsLoadedPromise: Promise<IsolatedFileSystem[]>;
  private constructor() {
    super();

    this.#fileSystems = new Map();
    this.callbacks = new Map();
    this.progresses = new Map();

    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.FileSystemRemoved, this.onFileSystemRemoved, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.FileSystemAdded, event => {
          this.onFileSystemAdded(event);
        }, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.FileSystemFilesChangedAddedRemoved, this.onFileSystemFilesChanged, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.IndexingTotalWorkCalculated, this.onIndexingTotalWorkCalculated, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.IndexingWorked, this.onIndexingWorked, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.IndexingDone, this.onIndexingDone, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.SearchCompleted, this.onSearchCompleted, this);

    // Initialize exclude pattern settings
    const defaultCommonExcludedFolders = [
      '/node_modules/',
      '/\\.devtools',
      '/\\.git/',
      '/\\.sass-cache/',
      '/\\.hg/',
      '/\\.idea/',
      '/\\.svn/',
      '/\\.cache/',
      '/\\.project/',
      '/\\.next/',
    ];
    const defaultWinExcludedFolders = ['/Thumbs.db$', '/ehthumbs.db$', '/Desktop.ini$', '/\\$RECYCLE.BIN/'];
    const defaultMacExcludedFolders = [
      '/\\.DS_Store$',
      '/\\.Trashes$',
      '/\\.Spotlight-V100$',
      '/\\.AppleDouble$',
      '/\\.LSOverride$',
      '/Icon$',
      '/\\._.*$',
    ];
    const defaultLinuxExcludedFolders = ['/.*~$'];
    let defaultExcludedFolders: string[] = defaultCommonExcludedFolders;
    if (Host.Platform.isWin()) {
      defaultExcludedFolders = defaultExcludedFolders.concat(defaultWinExcludedFolders);
    } else if (Host.Platform.isMac()) {
      defaultExcludedFolders = defaultExcludedFolders.concat(defaultMacExcludedFolders);
    } else {
      defaultExcludedFolders = defaultExcludedFolders.concat(defaultLinuxExcludedFolders);
    }
    const defaultExcludedFoldersPattern = defaultExcludedFolders.join('|');
    this.#workspaceFolderExcludePatternSetting = Common.Settings.Settings.instance().createRegExpSetting(
        'workspace-folder-exclude-pattern', defaultExcludedFoldersPattern, Host.Platform.isWin() ? 'i' : '');

    this.fileSystemRequestResolve = null;
    this.fileSystemsLoadedPromise = this.requestFileSystems();
  }

  static instance(opts: {forceNew: boolean|null} = {forceNew: null}): IsolatedFileSystemManager {
    const {forceNew} = opts;
    if (!isolatedFileSystemManagerInstance || forceNew) {
      isolatedFileSystemManagerInstance = new IsolatedFileSystemManager();
    }

    return isolatedFileSystemManagerInstance;
  }

  static removeInstance(): void {
    isolatedFileSystemManagerInstance = null;
  }

  private requestFileSystems(): Promise<IsolatedFileSystem[]> {
    const {resolve, promise} = Promise.withResolvers<IsolatedFileSystem[]>();
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.FileSystemsLoaded, onFileSystemsLoaded, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.requestFileSystems();
    return promise;

    function onFileSystemsLoaded(
        this: IsolatedFileSystemManager,
        event: Common.EventTarget.EventTargetEvent<Host.InspectorFrontendHostAPI.DevToolsFileSystem[]>): void {
      const fileSystems = event.data;
      const promises = [];
      for (let i = 0; i < fileSystems.length; ++i) {
        promises.push(this.#addFileSystem(fileSystems[i], false));
      }
      void Promise.all(promises).then(onFileSystemsAdded);
    }

    function onFileSystemsAdded(fileSystems: Array<IsolatedFileSystem|null>): void {
      resolve(fileSystems.filter(fs => !!fs));
    }
  }

  addFileSystem(type?: string): Promise<IsolatedFileSystem|null> {
    Host.userMetrics.actionTaken(
        type === 'overrides' ? Host.UserMetrics.Action.OverrideTabAddFolder :
                               Host.UserMetrics.Action.WorkspaceTabAddFolder);
    return new Promise(resolve => {
      this.fileSystemRequestResolve = resolve;
      Host.InspectorFrontendHost.InspectorFrontendHostInstance.addFileSystem(type || '');
    });
  }

  removeFileSystem(fileSystem: PlatformFileSystem): void {
    Host.userMetrics.actionTaken(
        fileSystem.type() === PlatformFileSystemType.OVERRIDES ? Host.UserMetrics.Action.OverrideTabRemoveFolder :
                                                                 Host.UserMetrics.Action.WorkspaceTabRemoveFolder);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.removeFileSystem(fileSystem.embedderPath());
  }

  waitForFileSystems(): Promise<IsolatedFileSystem[]> {
    return this.fileSystemsLoadedPromise;
  }

  #addFileSystem(fileSystem: Host.InspectorFrontendHostAPI.DevToolsFileSystem, dispatchEvent: boolean):
      Promise<IsolatedFileSystem|null> {
    const embedderPath = fileSystem.fileSystemPath;
    const fileSystemURL = Common.ParsedURL.ParsedURL.rawPathToUrlString(fileSystem.fileSystemPath);
    const promise = IsolatedFileSystem.create(
        this, fileSystemURL, embedderPath, hostFileSystemTypeToPlatformFileSystemType(fileSystem.type),
        fileSystem.fileSystemName, fileSystem.rootURL, fileSystem.type === 'automatic');
    return promise.then(storeFileSystem.bind(this));

    function storeFileSystem(this: IsolatedFileSystemManager, fileSystem: IsolatedFileSystem|null): IsolatedFileSystem|
        null {
      if (!fileSystem) {
        return null;
      }
      this.#fileSystems.set(fileSystemURL, fileSystem);
      fileSystem.addEventListener(PlatformFileSystemEvents.FILE_SYSTEM_ERROR, this.#onFileSystemError, this);
      if (dispatchEvent) {
        this.dispatchEventToListeners(Events.FileSystemAdded, fileSystem);
      }
      return fileSystem;
    }
  }

  addPlatformFileSystem(fileSystemURL: Platform.DevToolsPath.UrlString, fileSystem: PlatformFileSystem): void {
    this.#fileSystems.set(fileSystemURL, fileSystem);
    fileSystem.addEventListener(PlatformFileSystemEvents.FILE_SYSTEM_ERROR, this.#onFileSystemError, this);
    this.dispatchEventToListeners(Events.FileSystemAdded, fileSystem);
  }

  private onFileSystemAdded(
      event: Common.EventTarget.EventTargetEvent<Host.InspectorFrontendHostAPI.FileSystemAddedEvent>): void {
    const {errorMessage, fileSystem} = event.data;
    if (errorMessage) {
      if (errorMessage !== '<selection cancelled>' && errorMessage !== '<permission denied>') {
        Common.Console.Console.instance().error(i18nString(UIStrings.unableToAddFilesystemS, {PH1: errorMessage}));
      }
      if (!this.fileSystemRequestResolve) {
        return;
      }
      this.fileSystemRequestResolve.call(null, null);
      this.fileSystemRequestResolve = null;
    } else if (fileSystem) {
      void this.#addFileSystem(fileSystem, true).then(fileSystem => {
        if (this.fileSystemRequestResolve) {
          this.fileSystemRequestResolve.call(null, fileSystem);
          this.fileSystemRequestResolve = null;
        }
      });
    }
  }

  #onFileSystemError(event: Common.EventTarget.EventTargetEvent<string>): void {
    this.dispatchEventToListeners(Events.FileSystemError, event.data);
  }

  private onFileSystemRemoved(event: Common.EventTarget.EventTargetEvent<Platform.DevToolsPath.RawPathString>): void {
    const embedderPath = event.data;
    const fileSystemPath = Common.ParsedURL.ParsedURL.rawPathToUrlString(embedderPath);
    const isolatedFileSystem = this.#fileSystems.get(fileSystemPath);
    if (!isolatedFileSystem) {
      return;
    }
    this.#fileSystems.delete(fileSystemPath);
    isolatedFileSystem.removeEventListener(PlatformFileSystemEvents.FILE_SYSTEM_ERROR, this.#onFileSystemError, this);
    isolatedFileSystem.fileSystemRemoved();
    this.dispatchEventToListeners(Events.FileSystemRemoved, isolatedFileSystem);
  }

  private onFileSystemFilesChanged(
      event: Common.EventTarget.EventTargetEvent<Host.InspectorFrontendHostAPI.FilesChangedEvent>): void {
    const urlPaths = {
      changed: groupFilePathsIntoFileSystemPaths.call(this, event.data.changed),
      added: groupFilePathsIntoFileSystemPaths.call(this, event.data.added),
      removed: groupFilePathsIntoFileSystemPaths.call(this, event.data.removed),
    };

    this.dispatchEventToListeners(Events.FileSystemFilesChanged, urlPaths);

    function groupFilePathsIntoFileSystemPaths(
        this: IsolatedFileSystemManager, embedderPaths: Platform.DevToolsPath.RawPathString[]):
        Platform.MapUtilities.Multimap<Platform.DevToolsPath.UrlString, Platform.DevToolsPath.UrlString> {
      const paths =
          new Platform.MapUtilities.Multimap<Platform.DevToolsPath.UrlString, Platform.DevToolsPath.UrlString>();
      for (const embedderPath of embedderPaths) {
        const filePath = Common.ParsedURL.ParsedURL.rawPathToUrlString(embedderPath);
        for (const fileSystemPath of this.#fileSystems.keys()) {
          const fileSystem = this.#fileSystems.get(fileSystemPath);
          if (fileSystem?.isFileExcluded(Common.ParsedURL.ParsedURL.rawPathToEncodedPathString(embedderPath))) {
            continue;
          }
          const pathPrefix = fileSystemPath.endsWith('/') ? fileSystemPath : fileSystemPath + '/';
          if (!filePath.startsWith(pathPrefix)) {
            continue;
          }
          paths.set(fileSystemPath, filePath);
        }
      }
      return paths;
    }
  }

  fileSystems(): PlatformFileSystem[] {
    return [...this.#fileSystems.values()];
  }

  fileSystem(fileSystemPath: Platform.DevToolsPath.UrlString): PlatformFileSystem|null {
    return this.#fileSystems.get(fileSystemPath) || null;
  }

  workspaceFolderExcludePatternSetting(): Common.Settings.RegExpSetting {
    return this.#workspaceFolderExcludePatternSetting;
  }

  registerCallback(callback: (arg0: Platform.DevToolsPath.RawPathString[]) => void): number {
    const requestId = ++lastRequestId;
    this.callbacks.set(requestId, callback);
    return requestId;
  }

  registerProgress(progress: Common.Progress.Progress): number {
    const requestId = ++lastRequestId;
    this.progresses.set(requestId, progress);
    return requestId;
  }

  private onIndexingTotalWorkCalculated(
      event: Common.EventTarget.EventTargetEvent<Host.InspectorFrontendHostAPI.IndexingTotalWorkCalculatedEvent>):
      void {
    const {requestId, totalWork} = event.data;
    const progress = this.progresses.get(requestId);
    if (!progress) {
      return;
    }
    progress.totalWork = totalWork;
  }

  private onIndexingWorked(
      event: Common.EventTarget.EventTargetEvent<Host.InspectorFrontendHostAPI.IndexingWorkedEvent>): void {
    const {requestId, worked} = event.data;
    const progress = this.progresses.get(requestId);
    if (!progress) {
      return;
    }
    progress.worked += worked;
    if (progress.canceled) {
      Host.InspectorFrontendHost.InspectorFrontendHostInstance.stopIndexing(requestId);
      this.onIndexingDone(event);
    }
  }

  private onIndexingDone(event: Common.EventTarget.EventTargetEvent<Host.InspectorFrontendHostAPI.IndexingEvent>):
      void {
    const {requestId} = event.data;
    const progress = this.progresses.get(requestId);
    if (!progress) {
      return;
    }
    progress.done = true;
    this.progresses.delete(requestId);
  }

  private onSearchCompleted(
      event: Common.EventTarget.EventTargetEvent<Host.InspectorFrontendHostAPI.SearchCompletedEvent>): void {
    const {requestId, files} = event.data;
    const callback = this.callbacks.get(requestId);
    if (!callback) {
      return;
    }
    callback.call(null, files);
    this.callbacks.delete(requestId);
  }
}

export enum Events {
  /* eslint-disable @typescript-eslint/naming-convention -- Used by web_tests. */
  FileSystemAdded = 'FileSystemAdded',
  FileSystemRemoved = 'FileSystemRemoved',
  FileSystemFilesChanged = 'FileSystemFilesChanged',
  ExcludedFolderAdded = 'ExcludedFolderAdded',
  ExcludedFolderRemoved = 'ExcludedFolderRemoved',
  FileSystemError = 'FileSystemError',
  /* eslint-enable @typescript-eslint/naming-convention */
}

export interface EventTypes {
  [Events.FileSystemAdded]: PlatformFileSystem;
  [Events.FileSystemRemoved]: PlatformFileSystem;
  [Events.FileSystemFilesChanged]: FilesChangedData;
  [Events.ExcludedFolderAdded]: Platform.DevToolsPath.EncodedPathString;
  [Events.ExcludedFolderRemoved]: Platform.DevToolsPath.EncodedPathString;
  [Events.FileSystemError]: string;
}

let lastRequestId = 0;

function hostFileSystemTypeToPlatformFileSystemType(type: string): PlatformFileSystemType {
  switch (type) {
    case 'snippets':
      return PlatformFileSystemType.SNIPPETS;
    case 'overrides':
      return PlatformFileSystemType.OVERRIDES;
    default:
      return PlatformFileSystemType.WORKSPACE_PROJECT;
  }
}