const timeUnits = [
  ["Y", 1e3 * 60 * 60 * 24 * 365],
  // years
  ["M", 1e3 * 60 * 60 * 24 * 30],
  // months
  ["D", 1e3 * 60 * 60 * 24],
  // days
  ["H", 1e3 * 60 * 60],
  // hours
  ["m", 1e3 * 60],
  // minutes
  ["s", 1e3],
  // seconds
  ["S", 1]
  // million seconds
];
function formatTimeStr(duration, format) {
  let leftDuration = duration;
  const escapeRegex = /\[[^\]]*]/g;
  const keepList = (format.match(escapeRegex) || []).map((str) => str.slice(1, -1));
  const templateText = format.replace(escapeRegex, "[]");
  const replacedText = timeUnits.reduce((current, [name, unit]) => {
    if (current.includes(name)) {
      const value = Math.floor(leftDuration / unit);
      leftDuration -= value * unit;
      return current.replace(new RegExp(`${name}+`, "g"), (match) => {
        const len = match.length;
        return value.toString().padStart(len, "0");
      });
    }
    return current;
  }, templateText);
  let index = 0;
  return replacedText.replace(escapeRegex, () => {
    const match = keepList[index];
    index += 1;
    return match;
  });
}
function formatCountdown(value, config) {
  const { format = "" } = config;
  const target = new Date(value).getTime();
  const current = Date.now();
  const diff = Math.max(target - current, 0);
  return formatTimeStr(diff, format);
}

export { formatCountdown, formatTimeStr };
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