import { EventEmitter } from 'eventemitter3';
type VideoPlayerOptions = {
  url?: string;
  emitter?: EventEmitter;
};
export class VideoPlayer {
  url?: string;
  isPlaying = false;
  audio?: HTMLAudioElement;
  emitter?: EventEmitter;
  private endedHandler?: () => void;
  constructor(opts?: VideoPlayerOptions) {
    this.url = opts?.url;
    this.emitter = opts?.emitter || new EventEmitter();
  }
  init() {
    if (!this.emitter) {
      this.emitter = new EventEmitter();
    }
    return this.emitter;
  }
  play(url?: string) {
    if (this.isPlaying) {
      return { code: 400 };
    }
    const playUrl = url || this.url;
    if (!playUrl) {
      return { code: 404 };
    }
    if (playUrl !== this.url) {
      this.url = playUrl;
    }
    // 创建新的Audio对象前，确保清理之前的资源
    if (this.audio && this.endedHandler) {
      this.audio.removeEventListener('ended', this.endedHandler);
    }

    this.audio = new Audio(playUrl);
    this.audio.play();
    this.isPlaying = true;
    this.emitter?.emit('start', { url: playUrl, status: 'start' });

    // 保存引用以便于后续移除
    this.endedHandler = () => {
      this.audio = undefined;
      this.isPlaying = false;
      this.emitter?.emit('stop', this.url);
    };

    this.audio.addEventListener('ended', this.endedHandler);
    return { code: 200 };
  }
  stop() {
    if (this.isPlaying) {
      // 移除事件监听器
      if (this.audio && this.endedHandler) {
        this.audio.removeEventListener('ended', this.endedHandler);
      }
      this.audio?.pause();
      this.audio = undefined;
      this.isPlaying = false;
    }
    this.emitter?.emit('stop', this.url);
  }
  onStop(callback: (url: string) => void) {
    this.emitter?.on('stop', callback);
    return () => {
      this.emitter?.off('stop', callback);
    };
  }
  close() {
    this.emitter?.removeAllListeners();
    this.emitter = undefined;
  }
}