// 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 * as i18n from '../../core/i18n/i18n.js';
import * as UI from '../../ui/legacy/legacy.js';

import {EditFileSystemView} from './EditFileSystemView.js';
import workspaceSettingsTabStyles from './workspaceSettingsTab.css.js';

import type {FileSystem} from './FileSystemWorkspaceBinding.js';
import {IsolatedFileSystem} from './IsolatedFileSystem.js';
import {Events, IsolatedFileSystemManager} from './IsolatedFileSystemManager.js';
import {NetworkPersistenceManager} from './NetworkPersistenceManager.js';
import type {PlatformFileSystem} from './PlatformFileSystem.js';

const UIStrings = {
  /**
  *@description Text of a DOM element in Workspace Settings Tab of the Workspace settings in Settings
  */
  workspace: 'Workspace',
  /**
  *@description Text of a DOM element in Workspace Settings Tab of the Workspace settings in Settings
  */
  mappingsAreInferredAutomatically: 'Mappings are inferred automatically.',
  /**
  *@description Text of the add button in Workspace Settings Tab of the Workspace settings in Settings
  */
  addFolder: 'Add folder…',
  /**
  *@description Label element text content in Workspace Settings Tab of the Workspace settings in Settings
  */
  folderExcludePattern: 'Folder exclude pattern',
  /**
  *@description Label for an item to remove something
  */
  remove: 'Remove',
};
const str_ = i18n.i18n.registerUIStrings('models/persistence/WorkspaceSettingsTab.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);

let workspaceSettingsTabInstance: WorkspaceSettingsTab;

export class WorkspaceSettingsTab extends UI.Widget.VBox {
  containerElement: HTMLElement;
  private readonly fileSystemsListContainer: HTMLElement;
  private readonly elementByPath: Map<string, Element>;
  private readonly mappingViewByPath: Map<string, EditFileSystemView>;
  private constructor() {
    super();

    this.element.classList.add('workspace-settings-tab');
    const header = this.element.createChild('header');
    UI.UIUtils.createTextChild(header.createChild('h1'), i18nString(UIStrings.workspace));

    this.containerElement = this.element.createChild('div', 'settings-container-wrapper')
                                .createChild('div', 'settings-tab settings-content settings-container');

    IsolatedFileSystemManager.instance().addEventListener(
        Events.FileSystemAdded, event => this.fileSystemAdded(event.data), this);
    IsolatedFileSystemManager.instance().addEventListener(
        Events.FileSystemRemoved, event => this.fileSystemRemoved(event.data), this);

    const folderExcludePatternInput = this.createFolderExcludePatternInput();
    folderExcludePatternInput.classList.add('folder-exclude-pattern');
    this.containerElement.appendChild(folderExcludePatternInput);

    const div = this.containerElement.createChild('div', 'settings-info-message');
    UI.UIUtils.createTextChild(div, i18nString(UIStrings.mappingsAreInferredAutomatically));

    this.fileSystemsListContainer = this.containerElement.createChild('div', '');

    const addButton =
        UI.UIUtils.createTextButton(i18nString(UIStrings.addFolder), this.addFileSystemClicked.bind(this));
    this.containerElement.appendChild(addButton);
    this.setDefaultFocusedElement(addButton);

    this.elementByPath = new Map();

    this.mappingViewByPath = new Map();

    const fileSystems = IsolatedFileSystemManager.instance().fileSystems();
    for (let i = 0; i < fileSystems.length; ++i) {
      this.addItem(fileSystems[i]);
    }
  }

  static instance(opts: {forceNew: boolean|null} = {forceNew: null}): WorkspaceSettingsTab {

  wasShown(): void {
    super.wasShown();
    this.registerCSSFiles([workspaceSettingsTabStyles]);
  }

  private createFolderExcludePatternInput(): Element {
    const p = document.createElement('p');
    const labelElement = p.createChild('label');
    labelElement.textContent = i18nString(UIStrings.folderExcludePattern);
    const inputElement = UI.UIUtils.createInput('', 'text');
    UI.ARIAUtils.bindLabelToControl(labelElement, inputElement);
    p.appendChild(inputElement);
    const folderExcludeSetting = IsolatedFileSystemManager.instance().workspaceFolderExcludePatternSetting();
    const setValue =
        UI.UIUtils.bindInput(inputElement, folderExcludeSetting.set.bind(folderExcludeSetting), regexValidator, false);
    folderExcludeSetting.addChangeListener(() => setValue.call(null, folderExcludeSetting.get()));
    setValue(folderExcludeSetting.get());
    return p;

    function regexValidator(value: string): {valid: boolean, errorMessage: (string|undefined)} {
      let regex;
      try {
        regex = new RegExp(value);
      } catch (e) {
      }
      const valid = Boolean(regex);
      return {valid, errorMessage: undefined};
    }
  }

  private addItem(fileSystem: PlatformFileSystem): void {
    // Support managing only instances of IsolatedFileSystem.
    if (!(fileSystem instanceof IsolatedFileSystem)) {
      return;
    }
    const networkPersistenceProject = NetworkPersistenceManager.instance().project();
    if (networkPersistenceProject &&
        IsolatedFileSystemManager.instance().fileSystem((networkPersistenceProject as FileSystem).fileSystemPath()) ===
            fileSystem) {
      return;
    }
    const element = this.renderFileSystem(fileSystem);
    this.elementByPath.set(fileSystem.path(), element);

    this.fileSystemsListContainer.appendChild(element);

    const mappingView = new EditFileSystemView(fileSystem.path());
    this.mappingViewByPath.set(fileSystem.path(), mappingView);
    mappingView.element.classList.add('file-system-mapping-view');
    mappingView.show(element);
  }

  private renderFileSystem(fileSystem: PlatformFileSystem): Element {
    const fileSystemPath = fileSystem.path();
    const lastIndexOfSlash = fileSystemPath.lastIndexOf('/');
    const folderName = fileSystemPath.substr(lastIndexOfSlash + 1);

    const element = document.createElement('div');
    element.classList.add('file-system-container');
    const header = element.createChild('div', 'file-system-header');

    const nameElement = header.createChild('div', 'file-system-name');
    nameElement.textContent = folderName;
    UI.ARIAUtils.markAsHeading(nameElement, 2);
    const path = header.createChild('div', 'file-system-path');
    path.textContent = fileSystemPath;
    UI.Tooltip.Tooltip.install(path, fileSystemPath);

    const toolbar = new UI.Toolbar.Toolbar('');
    const button = new UI.Toolbar.ToolbarButton(i18nString(UIStrings.remove), 'largeicon-delete');
    button.addEventListener(UI.Toolbar.ToolbarButton.Events.Click, this.removeFileSystemClicked.bind(this, fileSystem));
    toolbar.appendToolbarItem(button);
    header.appendChild(toolbar.element);

    return element;
  }

  private removeFileSystemClicked(fileSystem: PlatformFileSystem): void {
    IsolatedFileSystemManager.instance().removeFileSystem(fileSystem);
  }

  private addFileSystemClicked(): void {
    void IsolatedFileSystemManager.instance().addFileSystem();
  }

  private fileSystemAdded(fileSystem: PlatformFileSystem): void {
    this.addItem(fileSystem);
  }

  private fileSystemRemoved(fileSystem: PlatformFileSystem): void {
    const mappingView = this.mappingViewByPath.get(fileSystem.path());
    if (mappingView) {
      mappingView.dispose();
      this.mappingViewByPath.delete(fileSystem.path());
    }

    const element = this.elementByPath.get(fileSystem.path());
    if (element) {
      this.elementByPath.delete(fileSystem.path());
      element.remove();
    }
  }
}

    const {forceNew} = opts;
    if (!workspaceSettingsTabInstance || forceNew) {
      workspaceSettingsTabInstance = new WorkspaceSettingsTab();
    }

    return workspaceSettingsTabInstance;
  }

