// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/* eslint-disable rulesdir/no-imperative-dom-api */

import * as i18n from '../../core/i18n/i18n.js';
import type * as Protocol from '../../generated/protocol.js';
import * as IconButton from '../../ui/components/icon_button/icon_button.js';
import * as UI from '../../ui/legacy/legacy.js';
import * as VisualLogging from '../../ui/visual_logging/visual_logging.js';

import type {MainView, TriggerDispatcher} from './MainView.js';
import type {PlayerEvent} from './MediaModel.js';
import playerListViewStyles from './playerListView.css.js';
import {PlayerPropertyKeys} from './PlayerPropertiesView.js';

const UIStrings = {
  /**
   * @description A right-click context menu entry which when clicked causes the menu entry for that player to be removed.
   */
  hidePlayer: 'Hide player',
  /**
   * @description A right-click context menu entry which should keep the element selected, while hiding all other entries.
   */
  hideAllOthers: 'Hide all others',
  /**
   * @description Context menu entry which downloads the json dump when clicked
   */
  savePlayerInfo: 'Save player info',
  /**
   * @description Side-panel entry title text for the players section.
   */
  players: 'Players',
} as const;
const str_ = i18n.i18n.registerUIStrings('panels/media/PlayerListView.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
export interface PlayerStatus {
  playerTitle: string;
  playerID: string;
  exists: boolean;
  playing: boolean;
  titleEdited: boolean;
}
export interface PlayerStatusMapElement {
  playerStatus: PlayerStatus;
  playerTitleElement: HTMLElement|null;
}

export class PlayerListView extends UI.Widget.VBox implements TriggerDispatcher {
  private readonly playerEntryFragments: Map<string, UI.Fragment.Fragment>;
  private readonly playerEntriesWithHostnameFrameTitle: Set<string>;
  private readonly mainContainer: MainView;
  private currentlySelectedEntry: Element|null;

  constructor(mainContainer: MainView) {
    super({useShadowDom: true});
    this.registerRequiredCSS(playerListViewStyles);

    this.playerEntryFragments = new Map();
    this.playerEntriesWithHostnameFrameTitle = new Set();

    // Container where new panels can be added based on clicks.
    this.mainContainer = mainContainer;

    this.currentlySelectedEntry = null;
    this.contentElement.createChild('div', 'player-entry-header').textContent = i18nString(UIStrings.players);
  }

  private createPlayerListEntry(playerID: string): UI.Fragment.Fragment {
    const entry = UI.Fragment.Fragment.build`
    <div class="player-entry-row hbox">
    <div class="player-entry-status-icon vbox">
    <div $="icon" class="player-entry-status-icon-centering"></div>
    </div>
    <div $="frame-title" class="player-entry-frame-title">FrameTitle</div>
    <div $="player-title" class="player-entry-player-title">PlayerTitle</div>
    </div>
    `;
    const element = entry.element();
    element.setAttribute('jslog', `${VisualLogging.item('player').track({click: true})}`);
    element.addEventListener('click', this.selectPlayer.bind(this, playerID, element));
    element.addEventListener('contextmenu', this.rightClickPlayer.bind(this, playerID));

    entry.$('icon').appendChild(IconButton.Icon.create('pause', 'media-player'));
    return entry;
  }

  selectPlayerById(playerID: string): void {
    const fragment = this.playerEntryFragments.get(playerID);
    if (fragment) {
      this.selectPlayer(playerID, fragment.element());
    }
  }

  private selectPlayer(playerID: string, element: Element): void {
    this.mainContainer.renderMainPanel(playerID);
    if (this.currentlySelectedEntry !== null) {
      this.currentlySelectedEntry.classList.remove('selected');
      this.currentlySelectedEntry.classList.remove('force-white-icons');
    }
    element.classList.add('selected');
    element.classList.add('force-white-icons');
    this.currentlySelectedEntry = element;
  }

  private rightClickPlayer(playerID: string, event: Event): boolean {
    const contextMenu = new UI.ContextMenu.ContextMenu(event);
    contextMenu.headerSection().appendItem(
        i18nString(UIStrings.hidePlayer), this.mainContainer.markPlayerForDeletion.bind(this.mainContainer, playerID),
        {jslogContext: 'hide-player'});
    contextMenu.headerSection().appendItem(
        i18nString(UIStrings.hideAllOthers),
        this.mainContainer.markOtherPlayersForDeletion.bind(this.mainContainer, playerID),
        {jslogContext: 'hide-all-others'});
    contextMenu.headerSection().appendItem(
        i18nString(UIStrings.savePlayerInfo), this.mainContainer.exportPlayerData.bind(this.mainContainer, playerID),
        {jslogContext: 'save-player-info'});
    void contextMenu.show();
    return true;
  }

  private setMediaElementFrameTitle(playerID: string, frameTitle: string, isHostname: boolean): void {
    // Only remove the title from the set if we aren't setting a hostname title.
    // Otherwise, if it has a non-hostname title, and the requested new title is
    // a hostname, just drop it.
    if (this.playerEntriesWithHostnameFrameTitle.has(playerID)) {
      if (!isHostname) {
        this.playerEntriesWithHostnameFrameTitle.delete(playerID);
      }
    } else if (isHostname) {
      return;
    }

    if (!this.playerEntryFragments.has(playerID)) {
      return;
    }
    const fragment = this.playerEntryFragments.get(playerID);
    if (fragment?.element() === undefined) {
      return;
    }
    fragment.$('frame-title').textContent = frameTitle;
  }

  private setMediaElementPlayerTitle(playerID: string, playerTitle: string): void {
    if (!this.playerEntryFragments.has(playerID)) {
      return;
    }
    const fragment = this.playerEntryFragments.get(playerID);
    if (fragment === undefined) {
      return;
    }
    fragment.$('player-title').textContent = playerTitle;
  }

  private setMediaElementPlayerIcon(playerID: string, iconName: string): void {
    if (!this.playerEntryFragments.has(playerID)) {
      return;
    }
    const fragment = this.playerEntryFragments.get(playerID);
    if (fragment === undefined) {
      return;
    }
    const icon = fragment.$('icon');
    if (icon === undefined) {
      return;
    }
    icon.textContent = '';
    icon.appendChild(IconButton.Icon.create(iconName, 'media-player'));
  }

  private formatAndEvaluate(
      playerID: string, func: (...args: any[]) => unknown, candidate: string, min: number, max: number): void {
    if (candidate.length <= min) {
      return;
    }
    if (candidate.length >= max) {
      candidate = candidate.substring(0, max - 1) + '…';
    }
    func.bind(this)(playerID, candidate);
  }

  addMediaElementItem(playerID: string): void {
    const sidebarEntry = this.createPlayerListEntry(playerID);
    this.contentElement.appendChild(sidebarEntry.element());
    this.playerEntryFragments.set(playerID, sidebarEntry);
    this.playerEntriesWithHostnameFrameTitle.add(playerID);
  }

  deletePlayer(playerID: string): void {
    if (!this.playerEntryFragments.has(playerID)) {
      return;
    }
    const fragment = this.playerEntryFragments.get(playerID);
    if (fragment?.element() === undefined) {
      return;
    }
    this.contentElement.removeChild(fragment.element());
    this.playerEntryFragments.delete(playerID);
  }

  onEvent(playerID: string, event: PlayerEvent): void {
    const parsed = JSON.parse(event.value);
    const eventType = parsed.event;

    // Load events provide the actual underlying URL for the video, which makes
    // a great way to identify a specific video within a page that potentially
    // may have many videos. MSE videos have a special blob:http(s) protocol
    // that we'd like to keep mind of, so we do prepend blob:
    if (eventType === 'kLoad') {
      const url = parsed.url as string;
      const videoName = url.substring(url.lastIndexOf('/') + 1);
      this.formatAndEvaluate(playerID, this.setMediaElementPlayerTitle, videoName, 1, 20);
      return;
    }

    if (eventType === 'kPlay') {
      this.setMediaElementPlayerIcon(playerID, 'play');
      return;
    }

    if (eventType === 'kPause' || eventType === 'kEnded') {
      this.setMediaElementPlayerIcon(playerID, 'pause');
      return;
    }

    if (eventType === 'kWebMediaPlayerDestroyed') {
      this.setMediaElementPlayerIcon(playerID, 'cross');
      return;
    }
  }

  onProperty(playerID: string, property: Protocol.Media.PlayerProperty): void {
    // FrameUrl is always present, and we can generate a basic frame title from
    // it by grabbing the hostname. It's not possible to generate a "good" player
    // title from the FrameUrl though, since the page location itself might not
    // have any relevance to the video being played, and would be shared by all
    // videos on the page.
    if (property.name === PlayerPropertyKeys.FRAME_URL) {
      const frameTitle = new URL(property.value).hostname;
      this.formatAndEvaluate(playerID, this.setMediaElementFrameTitle, frameTitle, 1, 20);
      return;
    }

    // On the other hand, the page may set a title, which usually makes for a
    // better frame title than a hostname. Unfortunately, its only "usually",
    // since the site is free to set the title to _anything_, it might just be
    // junk, or it might be super long. If it's empty, or 1 character, It's
    // preferable to just drop it. Titles longer than 20 will have the first
    // 17 characters kept and an ellipsis appended.
    if (property.name === PlayerPropertyKeys.FRAME_TITLE && property.value) {
      this.formatAndEvaluate(playerID, this.setMediaElementFrameTitle, property.value, 1, 20);
      return;
    }
  }

  onError(_playerID: string, _error: Protocol.Media.PlayerError): void {
    // TODO(tmathmeyer) show an error icon next to the player name
  }

  onMessage(_playerID: string, _message: Protocol.Media.PlayerMessage): void {
    // TODO(tmathmeyer) show a message count number next to the player name.
  }
}