// Copyright 2016 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 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 * as Diff from '../../../../third_party/diff/diff.js';
import * as UI from '../../legacy.js';

import {FilteredListWidget, Provider, registerProvider} from './FilteredListWidget.js';
import {QuickOpenImpl} from './QuickOpen.js';

const UIStrings = {
  /**
  * @description Message to display if a setting change requires a reload of DevTools
  */
  oneOrMoreSettingsHaveChanged: 'One or more settings have changed which requires a reload to take effect.',
  /**
  * @description Text in Command Menu of the Command Menu
  */
  noCommandsFound: 'No commands found',
  /**
  * @description Text for command prefix of run a command
  */
  run: 'Run',
  /**
  * @description Text for command suggestion of run a command
  */
  command: 'Command',
};
const str_ = i18n.i18n.registerUIStrings('ui/legacy/components/quick_open/CommandMenu.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);

let commandMenuInstance: CommandMenu;

export class CommandMenu {
  private readonly commandsInternal: Command[];
  private constructor() {
    this.commandsInternal = [];
    this.loadCommands();
  }

  static instance(opts: {
    forceNew: boolean|null,
  } = {forceNew: null}): CommandMenu {
    const {forceNew} = opts;
    if (!commandMenuInstance || forceNew) {
      commandMenuInstance = new CommandMenu();
    }
    return commandMenuInstance;
  }

  static createCommand(options: CreateCommandOptions): Command {
    const {category, keys, title, shortcut, executeHandler, availableHandler, userActionCode} = options;

    let handler = executeHandler;
    if (userActionCode) {
      const actionCode = userActionCode;
      handler = (): void => {
        Host.userMetrics.actionTaken(actionCode);
        executeHandler();
      };
    }
    if (title === 'Show Issues') {
      // TODO(crbug.com/1172300) Ignored during the jsdoc to ts migration)
      // eslint-disable-next-line @typescript-eslint/naming-convention
      const cached_handler = handler;
      handler = (): void => {
        Host.userMetrics.issuesPanelOpenedFrom(Host.UserMetrics.IssueOpener.CommandMenu);
        cached_handler();
      };
    }

    return new Command(category, title, keys, shortcut, handler, availableHandler);
  }

  static createSettingCommand<V>(setting: Common.Settings.Setting<V>, title: string, value: V): Command {
    const category = setting.category();
    if (!category) {
      throw new Error(`Creating '${title}' setting command failed. Setting has no category.`);
    }
    const tags = setting.tags() || '';
    const reloadRequired = Boolean(setting.reloadRequired());
    return CommandMenu.createCommand({
      category: Common.Settings.getLocalizedSettingsCategory(category),
      keys: tags,
      title,
      shortcut: '',
      executeHandler: (): void => {
        setting.set(value);
        if (reloadRequired) {
          UI.InspectorView.InspectorView.instance().displayReloadRequiredWarning(
              i18nString(UIStrings.oneOrMoreSettingsHaveChanged));
        }
      },
      availableHandler,
      userActionCode: undefined,
    });

    function availableHandler(): boolean {
      return setting.get() !== value;
    }
  }

  static createActionCommand(options: ActionCommandOptions): Command {
    const {action, userActionCode} = options;
    const shortcut = UI.ShortcutRegistry.ShortcutRegistry.instance().shortcutTitleForAction(action.id()) || '';

    return CommandMenu.createCommand({
      category: action.category(),
      keys: action.tags() || '',
      title: action.title() || '',
      shortcut,
      executeHandler: action.execute.bind(action),
      userActionCode,
      availableHandler: undefined,
    });
  }

  static createRevealViewCommand(options: RevealViewCommandOptions): Command {
    const {title, tags, category, userActionCode, id} = options;

    return CommandMenu.createCommand({
      category,
      keys: tags,
      title,
      shortcut: '',
      executeHandler: UI.ViewManager.ViewManager.instance().showView.bind(
          UI.ViewManager.ViewManager.instance(), id, /* userGesture */ true),
      userActionCode,
      availableHandler: undefined,
    });
  }

  private loadCommands(): void {
    const locations = new Map<UI.ViewManager.ViewLocationValues, string>();
    for (const {category, name} of UI.ViewManager.getRegisteredLocationResolvers()) {
      if (category && name) {
        locations.set(name, category);
      }
    }
    const views = UI.ViewManager.getRegisteredViewExtensions();
    for (const view of views) {
      const viewLocation = view.location();
      const category = viewLocation && locations.get(viewLocation);
      if (!category) {
        continue;
      }

      const options: RevealViewCommandOptions = {
        title: view.commandPrompt(),
        tags: view.tags() || '',
        category,
        userActionCode: undefined,
        id: view.viewId(),
      };
      this.commandsInternal.push(CommandMenu.createRevealViewCommand(options));
    }
    // Populate allowlisted settings.
    const settingsRegistrations = Common.Settings.getRegisteredSettings();
    for (const settingRegistration of settingsRegistrations) {
      const options = settingRegistration.options;
      if (!options || !settingRegistration.category) {
        continue;
      }
      for (const pair of options) {
        const setting = Common.Settings.Settings.instance().moduleSetting(settingRegistration.settingName);
        this.commandsInternal.push(CommandMenu.createSettingCommand(setting, pair.title(), pair.value));
      }
    }
  }

  commands(): Command[] {
    return this.commandsInternal;
  }
}
export interface ActionCommandOptions {
  action: UI.ActionRegistration.Action;
  userActionCode?: number;
}

export interface RevealViewCommandOptions {
  id: string;
  title: string;
  tags: string;
  category: string;
  userActionCode?: number;
}

export interface CreateCommandOptions {
  category: string;
  keys: string;
  title: string;
  shortcut: string;
  executeHandler: () => void;
  availableHandler?: () => boolean;
  userActionCode?: number;
}

let commandMenuProviderInstance: CommandMenuProvider;

export class CommandMenuProvider extends Provider {
  private commands: Command[];
  private constructor() {
    super();
    this.commands = [];
  }
  static instance(opts: {
    forceNew: boolean|null,
  } = {forceNew: null}): CommandMenuProvider {
    const {forceNew} = opts;
    if (!commandMenuProviderInstance || forceNew) {
      commandMenuProviderInstance = new CommandMenuProvider();
    }

    return commandMenuProviderInstance;
  }

  attach(): void {
    const allCommands = CommandMenu.instance().commands();

    // Populate allowlisted actions.
    const actions = UI.ActionRegistry.ActionRegistry.instance().availableActions();
    for (const action of actions) {
      const category = action.category();
      if (!category) {
        continue;
      }

      const options: ActionCommandOptions = {action, userActionCode: undefined};
      this.commands.push(CommandMenu.createActionCommand(options));
    }

    for (const command of allCommands) {
      if (command.available()) {
        this.commands.push(command);
      }
    }

    this.commands = this.commands.sort(commandComparator);

    function commandComparator(left: Command, right: Command): number {
      const cats = Platform.StringUtilities.compare(left.category(), right.category());
      return cats ? cats : Platform.StringUtilities.compare(left.title(), right.title());
    }
  }

  detach(): void {
    this.commands = [];
  }

  itemCount(): number {
    return this.commands.length;
  }

  itemKeyAt(itemIndex: number): string {
    return this.commands[itemIndex].key();
  }

  itemScoreAt(itemIndex: number, query: string): number {
    const command = this.commands[itemIndex];
    let score = Diff.Diff.DiffWrapper.characterScore(query.toLowerCase(), command.title().toLowerCase());

    // Score panel/drawer reveals above regular actions.
    if (command.category().startsWith('Panel')) {
      score += 2;
    } else if (command.category().startsWith('Drawer')) {
      score += 1;
    }

    return score;
  }

  renderItem(itemIndex: number, query: string, titleElement: Element, subtitleElement: Element): void {
    const command = this.commands[itemIndex];

    titleElement.removeChildren();
    UI.UIUtils.createTextChild(titleElement, command.title());
    FilteredListWidget.highlightRanges(titleElement, query, true);

    subtitleElement.textContent = command.shortcut();

    const tagElement = (titleElement.parentElement?.parentElement?.createChild('span', 'tag') as HTMLElement);
    if (!tagElement) {
      return;
    }
    const index = Platform.StringUtilities.hashCode(command.category()) % MaterialPaletteColors.length;
    tagElement.style.backgroundColor = MaterialPaletteColors[index];
    tagElement.style.color = 'var(--color-background)';
    tagElement.textContent = command.category();
  }

  selectItem(itemIndex: number|null, _promptValue: string): void {
    if (itemIndex === null) {
      return;
    }
    this.commands[itemIndex].execute();
    Host.userMetrics.actionTaken(Host.UserMetrics.Action.SelectCommandFromCommandMenu);
  }

  notFoundText(): string {
    return i18nString(UIStrings.noCommandsFound);
  }
}

export const MaterialPaletteColors = [
  '#F44336',
  '#E91E63',
  '#9C27B0',
  '#673AB7',
  '#3F51B5',
  '#03A9F4',
  '#00BCD4',
  '#009688',
  '#4CAF50',
  '#8BC34A',
  '#CDDC39',
  '#FFC107',
  '#FF9800',
  '#FF5722',
  '#795548',
  '#9E9E9E',
  '#607D8B',
];

export class Command {
  private readonly categoryInternal: string;
  private readonly titleInternal: string;
  private readonly keyInternal: string;
  private readonly shortcutInternal: string;
  private readonly executeHandler: () => void;
  private readonly availableHandler?: () => boolean;

  constructor(
      category: string, title: string, key: string, shortcut: string, executeHandler: () => void,
      availableHandler?: () => boolean) {
    this.categoryInternal = category;
    this.titleInternal = title;
    this.keyInternal = category + '\0' + title + '\0' + key;
    this.shortcutInternal = shortcut;
    this.executeHandler = executeHandler;
    this.availableHandler = availableHandler;
  }

  category(): string {
    return this.categoryInternal;
  }

  title(): string {
    return this.titleInternal;
  }

  key(): string {
    return this.keyInternal;
  }

  shortcut(): string {
    return this.shortcutInternal;
  }

  available(): boolean {
    return this.availableHandler ? this.availableHandler() : true;
  }

  execute(): void {
    this.executeHandler();
  }
}

let showActionDelegateInstance: ShowActionDelegate;
export class ShowActionDelegate implements UI.ActionRegistration.ActionDelegate {
  static instance(opts: {
    forceNew: boolean|null,
  } = {forceNew: null}): ShowActionDelegate {
    const {forceNew} = opts;
    if (!showActionDelegateInstance || forceNew) {
      showActionDelegateInstance = new ShowActionDelegate();
    }

    return showActionDelegateInstance;
  }

  handleAction(_context: UI.Context.Context, _actionId: string): boolean {
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.bringToFront();
    QuickOpenImpl.show('>');
    return true;
  }
}

registerProvider({
  prefix: '>',
  iconName: 'ic_command_run_command',
  provider: () => Promise.resolve(CommandMenuProvider.instance()),
  titlePrefix: (): Common.UIString.LocalizedString => i18nString(UIStrings.run),
  titleSuggestion: (): Common.UIString.LocalizedString => i18nString(UIStrings.command),
});