function updateHTML(elmId, value) {
  document.getElementById(elmId).innerHTML = value;
}

function setytplayerState(newState) {
  updateHTML("playerstate", newState);
}

function onYouTubePlayerReady(playerId) {
  ytplayer = document.getElementById("myytplayer");
  setInterval(updateytplayerInfo, 100);
  updateytplayerInfo();
  ytplayer.addEventListener("onStateChange", "onytplayerStateChange");
  ytplayer.addEventListener("onError", "onPlayerError");
}

function onytplayerStateChange(newState) {
  setytplayerState(newState);
}

function onPlayerError(errorCode) {
  alert("An error occurred: "+ errorCode);
}

function updateytplayerInfo() {
//  updateHTML("bytesloaded", getBytesLoaded());
//  updateHTML("bytestotal", getBytesTotal());
//  updateHTML("runTime_seconds", getDuration());
  updateHTML("runTime_seconds", getCurrentTime());
//  updateHTML("startbytes", getStartBytes());
}

// functions for the api calls
function play() {
  if (ytplayer) {
    ytplayer.playVideo();
  }
}

function pause() {
  if (ytplayer) {
    ytplayer.pauseVideo();
  }
}

function stop() {
  if (ytplayer) {
    ytplayer.stopVideo();
  }
}

function getPlayerState() {
  if (ytplayer) {
    return ytplayer.getPlayerState();
  }
}

function seekTo(seconds) {
  if (ytplayer) {
    ytplayer.seekTo(seconds, true);
  }
}

function getBytesLoaded() {
  if (ytplayer) {
    return ytplayer.getVideoBytesLoaded();
  }
}

function getBytesTotal() {
  if (ytplayer) {
    return ytplayer.getVideoBytesTotal();
  }
}

function getCurrentTime() {
  if (ytplayer) {
    return ytplayer.getCurrentTime();
  }
}

function getDuration() {
  if (ytplayer) {
    return ytplayer.getDuration();
  }
}

function getStartBytes() {
  if (ytplayer) {
    return ytplayer.getVideoStartBytes();
  }
}

function mute() {
  if (ytplayer) {
    ytplayer.mute();
  }
}

function unMute() {
  if (ytplayer) {
    ytplayer.unMute();
  }
}

function startFromBeginning() {
  if (ytplayer) {
    ytplayer.seekTo(0, true);
  }
}