import flvJs from "flv.js";
// mpegts.js
import {
  getCameraStream,
  getNearCamera,
} from "@screen/pages/Home/components/RoadAndEvents/utils/httpList.js";

/**
 *
 * @param {HTMLElement} container 容器
 * @param {{camId?: string; url?: string}?} options {camId: 相机ID; url: 直播地址}
 * @returns
 */
export async function openVideoStream(container, { camId, url } = {}) {
  if (camId) {
    const { code, data } = await getCameraStream(camId).catch(() => ({}));

    if (code != 200) return;

    url = data.liveUrl;
  }

  if (!url) return;

  // console.log(flvJs.getFeatureList().mseLivePlayback);

  const player = flvJs.createPlayer({
    type: "flv",
    url: url,
    isLive: true,
    hasVideo: true,
    hasAudio: true,
  });

  player.attachMediaElement(container);

  player.load();
  player.play();

  player.on(flvJs.Events.ERROR, (e) => {});

  return player;
}

export class HttpLivePlayer {
  /**
   * @type { flvJs.Player }
   */
  player;

  /**
   * @type { HTMLVideoElement }
   */
  container;

  url;

  // 解码 帧
  lastDecodedFrames;

  constructor(container, options) {
    this.container = container;

    this.getUrl(options).then(() => {
      this.initLiveVideo();
    });
  }

  async getUrl({ camId, url, pileNum } = {}) {
    this.url = url;

    if (pileNum) {
      const { code, data } = await getNearCamera(pileNum).catch(() => ({}));
      if (code != 200 || !data?.length) return;

      camId = data[0].camId;
    }

    if (camId) {
      const { code, data } = await getCameraStream(camId).catch(() => ({}));
      if (code != 200) return;

      url = data.liveUrl;
    }

    if (!url) return Promise.reject("获取 url 失败!");

    this.url = url;
  }

  destroy() {
    if (!this.player) return;

    this.player.pause();
    this.player.unload();
    this.player.detachMediaElement();
    this.player.destroy();
    this.player = null;
  }

  initLiveVideo() {
    this.destroy();

    this.lastDecodedFrames = null;

    console.log(this.url);

    if (!this.url) return;

    this.player = flvJs.createPlayer(
      {
        type: "flv",
        url: this.url,
        isLive: true,
        hasVideo: true,
        hasAudio: false,
      },
      {
        autoCleanupSourceBuffer: true,
        // enableWorker: false, //不启用分离线程
        // enableStashBuffer: true, //关闭IO隐藏缓冲区
        isLive: true,
        lazyLoad: false,
      }
    );

    this.player.attachMediaElement(this.container);

    this.player.load();
    this.player.play();

    this.player.on(flvJs.Events.ERROR, (errorType, errorDetail, errorInfo) => {
      console.log("errorType", errorType);
      console.log("errorDetail", errorDetail);
      console.log("errorInfo", errorInfo);

      // 视频出错后销毁重建
      this.destroy();
      this.initLiveVideo();
    });

    // 视频断流
    this.player.on(flvJs.Events.STATISTICS_INFO, (res) => {
      if (this.lastDecodedFrames != res.decodedFrames) {
        this.lastDecodedFrames = res.decodedFrames;
      } else {
        this.lastDecodedFrames = 0;
        this.destroy();
        this.initLiveVideo();
      }
    });
  }
}