import { PlaybackToggleButton, PlaybackToggleButtonConfig } from './PlaybackToggleButton';
import { DOM } from '../../DOM';
import { UIInstanceManager } from '../../UIManager';
import { PlayerAPI, PlayerEventBase, WarningEvent } from 'bitmovin-player';
import { i18n } from '../../localization/i18n';

export class SmallCenteredPlaybackToggleButton extends PlaybackToggleButton {
  constructor(config: PlaybackToggleButtonConfig = {}) {
    super(config);

    this.config = this.mergeConfig(
      config,
      {
        cssClass: 'ui-smallcenteredplaybacktogglebutton',
        text: i18n.getLocalizer('playPause'),
        role: 'button',
      },
      this.config,
    );
  }

  configure(player: PlayerAPI, uimanager: UIInstanceManager): void {
    // Update button state through API events
    super.configure(player, uimanager, false);

    // Set enterFullscreenOnInitialPlayback if set in the uimanager config
    if (typeof uimanager.getConfig().enterFullscreenOnInitialPlayback === 'boolean') {
      this.config.enterFullscreenOnInitialPlayback = uimanager.getConfig().enterFullscreenOnInitialPlayback;
    }

    const togglePlayback = () => {
      if (player.isPlaying() || this.isPlayInitiated) {
        player.pause('ui');
      } else {
        player.play('ui');
      }
    };

    let firstPlay = true;

    this.onClick.subscribe(() => {
      togglePlayback();

      if (firstPlay && this.config.enterFullscreenOnInitialPlayback) {
        player.setViewMode(player.exports.ViewMode.Fullscreen);
      }
    });

    player.on(player.exports.PlayerEvent.Playing, () => {
      // Playback has really started, we can disable the flag to switch to normal toggle button handling
      firstPlay = false;
    });

    const suppressPlayButtonTransitionAnimation = () => {
      // Disable the current animation
      this.setTransitionAnimationsEnabled(false);

      // Enable the transition animations for the next state change
      this.onToggle.subscribeOnce(() => {
        this.setTransitionAnimationsEnabled(true);
      });
    };

    // Hide the play button animation when the UI is loaded (it should only be animated on state changes)
    suppressPlayButtonTransitionAnimation();

    const isAutoplayEnabled = Boolean(player.getConfig().playback?.autoplay);
    // We only know if an autoplay attempt is upcoming if the player is not yet ready. If the player is already ready,
    // the attempt might be upcoming or might have already happened, but we don't have to handle that because we can
    // simply rely on isPlaying and the play state events.
    const isAutoplayUpcoming = !player.getSource() && isAutoplayEnabled;

    // Hide the play button when the player is already playing or autoplay is upcoming
    if (player.isPlaying() || isAutoplayUpcoming) {
      // Hide the play button (switch to playing state)
      this.on();
      // Disable the animation of the playing state switch
      suppressPlayButtonTransitionAnimation();

      // Show the play button without an animation if a play attempt is blocked
      player.on(player.exports.PlayerEvent.Warning, (event: WarningEvent) => {
        if (event.code === player.exports.WarningCode.PLAYBACK_COULD_NOT_BE_STARTED) {
          suppressPlayButtonTransitionAnimation();
        }
      });
    }
  }

  /**
   * Enables or disables the play state transition animations of the play button image. Can be used to suppress
   * animations.
   * @param {boolean} enabled true to enable the animations (default), false to disable them
   */
  protected setTransitionAnimationsEnabled(enabled: boolean): void {
    const noTransitionAnimationsClass = this.prefixCss('no-transition-animations');

    if (enabled) {
      this.getDomElement().removeClass(noTransitionAnimationsClass);
    } else if (!this.getDomElement().hasClass(noTransitionAnimationsClass)) {
      this.getDomElement().addClass(noTransitionAnimationsClass);
    }
  }
}