export default class CallWindow {
  private iframe: HTMLIFrameElement;
  private vRemote: HTMLVideoElement | null = null;
  private vLocal: HTMLVideoElement | null = null;
  private audioBtn: HTMLAnchorElement | null = null;
  private videoBtn: HTMLAnchorElement | null = null;
  private userNameSpan: HTMLSpanElement | null = null;
  private vPlaceholder: HTMLParagraphElement | null = null;

  private tsInterval: ReturnType<typeof setInterval>;
  constructor(endCall: () => void) {
    const iframe = this.iframe = document.createElement('iframe');
    Object.assign(iframe.style, {
      position: "fixed",
      zIndex: 2147483647 - 1,
      //borderRadius: ".25em .25em .4em .4em",
      //border: "4px rgba(0, 0, 0, .7)",
      border: "none",
      bottom: "10px",
      right: "10px",
      background: "white",
      height: "200px",
      width: "200px",
    });
    document.body.appendChild(iframe);

    const doc = iframe.contentDocument;
    if (!doc) {
      console.error("OpenReplay: CallWindow iframe document is not reachable.")
      return; 
    }
    fetch("https://static.openreplay.com/tracker-assist/index.html")
    //fetch("file:///Users/shikhu/work/asayer-tester/dist/assist/index.html")
    .then(r => r.text())
    .then((text) => {
      iframe.onload = () => {
        doc.body.removeChild(doc.body.children[0]); //?!!>R#
        const assistSection = doc.getElementById("or-assist")
        assistSection && assistSection.removeAttribute("style");
        iframe.style.height = doc.body.scrollHeight + 'px';
        iframe.style.width = doc.body.scrollWidth + 'px';
        iframe.onload = null;
      }

      text = text.replace(/href="css/g, "href=\"https://static.openreplay.com/tracker-assist/css")
      doc.open();
      doc.write(text);
      doc.close();

      
      this.vLocal = doc.getElementById("video-local") as HTMLVideoElement;
      this.vRemote = doc.getElementById("video-remote") as HTMLVideoElement;
      
      //
      this.vLocal.parentElement && this.vLocal.parentElement.classList.add("d-none");

      this.audioBtn = doc.getElementById("audio-btn") as HTMLAnchorElement;
      this.audioBtn.onclick = () => this.toggleAudio();
      this.videoBtn = doc.getElementById("video-btn") as HTMLAnchorElement;
      this.videoBtn.onclick = () => this.toggleVideo();

      this.userNameSpan = doc.getElementById("username") as HTMLSpanElement;
      this.vPlaceholder = doc.querySelector("#remote-stream p")
      this._trySetAssistentName();
      this._trySetStreams();

      const endCallBtn = doc.getElementById("end-call-btn") as HTMLAnchorElement;
      endCallBtn.onclick = endCall;

      const tsText = doc.getElementById("time-stamp");
      const startTs = Date.now();
      if (tsText) {
        this.tsInterval = setInterval(() => {
          const ellapsed = Date.now() - startTs;
          const secsFull = ~~(ellapsed / 1000);
          const mins = ~~(secsFull / 60);
          const secs = secsFull - mins * 60
          tsText.innerText = `${mins}:${secs < 10 ? 0 : ''}${secs}`;
        }, 500);
      }

      // TODO: better D'n'D 
      doc.body.setAttribute("draggable", "true");
      doc.body.ondragstart = (e) => {
        if (!e.dataTransfer || !e.target) { return; }
        //@ts-ignore
        if (!e.target.classList || !e.target.classList.contains("card-header")) { return; }
        e.dataTransfer.setDragImage(doc.body, e.clientX, e.clientY);
      };
      doc.body.ondragend = e => {
        Object.assign(iframe.style, {
          left: `${e.clientX}px`, // TODO: fix in case e is inside the iframe
          top: `${e.clientY}px`,
          bottom: 'auto',
          right: 'auto',
        })
      }
    });
  }

  // TODO: load(): Promise

  private aRemote: HTMLAudioElement | null = null;
  private localStream: MediaStream | null = null;
  private remoteStream: MediaStream | null = null;
  private setLocalVideoStream: (MediaStream) => void = () => {};
  private videoRequested: boolean = true; // TODO: green camera light
  private _trySetStreams() {
    if (this.vRemote && !this.vRemote.srcObject && this.remoteStream) {
      this.vRemote.srcObject = this.remoteStream;

      if (this.vPlaceholder) {
        this.vPlaceholder.innerText = "Video has been paused. Click anywhere to resume.";
      }
      // Hack for audio (doesen't work in iframe because of some magical reasons (check if it is connected to autoplay?))
      this.aRemote = document.createElement("audio");
      this.aRemote.autoplay = true;
      this.aRemote.style.display = "none"
      this.aRemote.srcObject = this.remoteStream;
      document.body.appendChild(this.aRemote)
    }
    if (this.vLocal && !this.vLocal.srcObject && this.localStream) {
      this.vLocal.srcObject = this.localStream;
    }
  }
  setRemoteStream(rStream: MediaStream) {
    this.remoteStream = rStream;
    this._trySetStreams();
  }
  setLocalStream(lStream: MediaStream, setLocalVideoStream: (MediaStream) => void) {    
    lStream.getVideoTracks().forEach(track => {
      track.enabled = false;
    });
    this.localStream = lStream;
    this.setLocalVideoStream = setLocalVideoStream;
    this._trySetStreams();
  }

  playRemote() {
    this.vRemote && this.vRemote.play()
  }


  // TODO: determined workflow
  _trySetAssistentName() {
    if (this.userNameSpan && this.assistentName) {
      this.userNameSpan.innerText = this.assistentName;
    }
  }
  private assistentName: string = "";
  setAssistentName(name: string) {
    this.assistentName = name;
    this._trySetAssistentName();
  }

  toggleAudio() {
    let enabled = true;
    this.localStream?.getAudioTracks().forEach(track => {
      enabled = enabled && !track.enabled;
      track.enabled = enabled;
    });
    const cList = this.audioBtn?.classList;
    if (!this.audioBtn) { return; } 
    if (enabled) {
      this.audioBtn.classList.remove("muted");
      this.audioBtn.childNodes[1].textContent = "Mute";
    } else {
      this.audioBtn.classList.add("muted");
      this.audioBtn.childNodes[1].textContent = "Unmute";
    }
  }

  private _toggleVideoUI(enabled) {
    if (!this.videoBtn || !this.vLocal || !this.vLocal.parentElement) { return; } 
    if (enabled) {
      this.vLocal.parentElement.classList.remove("d-none");
      this.videoBtn.classList.remove("off");
      this.videoBtn.childNodes[1].textContent = "Stop Video";
    } else {
      this.vLocal.parentElement.classList.add("d-none");
      this.videoBtn.classList.add("off");
      this.videoBtn.childNodes[1].textContent = "Start Video";
    }
  }

  toggleVideo() {
    if (!this.videoRequested) {
      navigator.mediaDevices.getUserMedia({video:true, audio:false}).then(vd => {
        this.videoRequested = true;
        this.setLocalVideoStream(vd);
        this._toggleVideoUI(true);
        this.localStream?.getVideoTracks().forEach(track => {
          track.enabled = true;
        })
      });
      return;
    }
    let enabled = true;
    this.localStream?.getVideoTracks().forEach(track => {
      enabled = enabled && !track.enabled;
      track.enabled = enabled;
    });
    this._toggleVideoUI(enabled);
    
  }

  remove() {
    clearInterval(this.tsInterval);
    if (this.iframe.parentElement) {
      document.body.removeChild(this.iframe);   
    }
    if (this.aRemote && this.aRemote.parentElement) {
      document.body.removeChild(this.aRemote);  
    }
  }

}