import type { NativeEventEmitter } from 'react-native';
import { FWEventName } from './models/FWEventName';
import type {
  LiveStreamChatEvent,
  LiveStreamEvent,
  CustomLinkInteractionClickEvent,
} from './models/FWEvents';
import LiveStreamModule, {
  LiveStreamModuleEventEmitter,
} from './modules/LiveStreamModule';
import FWLoggerUtil from './utils/FWLoggerUtil';

export type onLiveStreamEventCallback = (
  event: LiveStreamEvent
) => Promise<void> | void;
export type onLiveStreamChatEventCallback = (
  event: LiveStreamChatEvent
) => Promise<void> | void;
export type CustomLinkInteractionClickCallback = (
  event: CustomLinkInteractionClickEvent
) => Promise<void> | void;

/**
 * The entry class of live stream.
 */
class LiveStream {
  private static _instance?: LiveStream;

  /**
   * The callback of live stream event.
   */
  public onLiveStreamEvent?: onLiveStreamEventCallback;
  /**
   * The callback of live stream chat event.
   */
  public onLiveStreamChatEvent?: onLiveStreamChatEventCallback;

  private _onCustomLinkInteractionClick?: CustomLinkInteractionClickCallback;

  /**
   * This callback is triggered when the user clicks
   * the link interaction in livestream.
   *
   * The host app can customize the click event processing logic of
   * the link interaction by setting the callback.
   */
  public get onCustomLinkInteractionClick():
    | CustomLinkInteractionClickCallback
    | undefined {
    return this._onCustomLinkInteractionClick;
  }

  public set onCustomLinkInteractionClick(
    value: CustomLinkInteractionClickCallback | undefined
  ) {
    this._onCustomLinkInteractionClick = value;
    LiveStreamModule.setCustomLinkInteractionClickEnabled(value != null);
  }

  private get eventEmitter(): NativeEventEmitter {
    return LiveStreamModuleEventEmitter;
  }

  public static getInstance() {
    if (!LiveStream._instance) {
      LiveStream._instance = new LiveStream();
    }

    return LiveStream._instance!;
  }

  private constructor() {
    FWLoggerUtil.log('LiveStream constructor');
    this.eventEmitter.addListener(FWEventName.LiveStream, (event) => {
      if (this.onLiveStreamEvent) {
        this.onLiveStreamEvent(event ?? {});
      }
    });

    this.eventEmitter.addListener(FWEventName.LiveStreamChat, (event) => {
      if (this.onLiveStreamChatEvent) {
        this.onLiveStreamChatEvent(event ?? {});
      }
    });

    this.eventEmitter.addListener(
      FWEventName.CustomLinkInteractionClick,
      (event) => {
        if (this._onCustomLinkInteractionClick) {
          this._onCustomLinkInteractionClick(event ?? {});
        }
      }
    );
  }
}

export default LiveStream;