import { PlayerAPI } from 'bitmovin-player';

export function getMinBufferLevel(player: PlayerAPI): number {
  const playerDuration = player.getDuration();

  const videoBufferLength = player.getVideoBufferLength();
  const audioBufferLength = player.getAudioBufferLength();
  // Calculate the buffer length which is the smaller length of the audio and video buffers. If one of these
  // buffers is not available, we set it's value to MAX_VALUE to make sure that the other real value is taken
  // as the buffer length.
  let bufferLength = Math.min(
    videoBufferLength != null ? videoBufferLength : Number.MAX_VALUE,
    audioBufferLength != null ? audioBufferLength : Number.MAX_VALUE,
  );
  // If both buffer lengths are missing, we set the buffer length to zero
  if (bufferLength === Number.MAX_VALUE) {
    bufferLength = 0;
  }

  return (100 / playerDuration) * bufferLength;
}