type AdMap = {
  [key: string]: any;
};

function pad(num: number): string {
  const s = num.toString();

  return s.padStart(2, "0");
}

function toHHMMSS(timeInSeconds: number): string {
  const hours = Math.floor(timeInSeconds / 3600);
  const minutes = Math.floor((timeInSeconds % 3600) / 60);
  const seconds = timeInSeconds % 60;

  return `${pad(hours)}:${pad(minutes)}:${pad(seconds)}.000`;
}

function convertOffset(offset: any): string {
  if (typeof offset === "number") {
    return toHHMMSS(offset);
  } else if (typeof offset === "string") {
    if (offset === "postroll") {
      return "end";
    }

    const floatOffset = parseFloat(offset);

    return isNaN(floatOffset) ? offset : toHHMMSS(floatOffset);
  } else {
    return toHHMMSS(0);
  }
}

function createAdBreak(ad: AdMap): string {
  const offset = ad["offset"];
  const id = offset.toString();
  const timestamp = convertOffset(offset);
  const url = ad["ad_url"].toString().trim();

  return `
    <vmap:AdBreak timeOffset="${timestamp}" breakType="linear" breakId="break-${id}">
        <vmap:AdSource id="ad-${id}-ad-1" allowMultipleAds="true" followRedirects="true">
            <vmap:AdTagURI templateType="vast3">
                <![CDATA[ ${url} ]]>
            </vmap:AdTagURI>
        </vmap:AdSource>
    </vmap:AdBreak>
  `.trim();
}

export function createVMAP(ads: AdMap[]): string {
  const header =
    '<vmap:VMAP xmlns:vmap="http://www.iab.net/videosuite/vmap" version="1.0">';

  const footer = "</vmap:VMAP>";

  return [header, ...ads.map(createAdBreak), footer].join("\n");
}