const offsetFormatCache = {};
const offsetCache = {};

/**
 * The function extracts UTC offset in minutes from the given date in specified
 * time zone.
 *
 * Unlike `Date.prototype.getTimezoneOffset`, this function returns the value
 * mirrored to the sign of the offset in the time zone. For Asia/Singapore
 * (UTC+8), `tzOffset` returns 480, while `getTimezoneOffset` returns -480.
 *
 * @param timeZone - Time zone name (IANA or UTC offset)
 * @param date - Date to check the offset for
 *
 * @returns UTC offset in minutes
 */
function tzOffset(timeZone, date) {
  try {
    const format = offsetFormatCache[timeZone] ||= new Intl.DateTimeFormat("en-GB", {
      timeZone,
      hour: "numeric",
      timeZoneName: "longOffset"
    }).format;
    const offsetStr = format(date).split('GMT')[1] || '';
    if (offsetStr in offsetCache) return offsetCache[offsetStr];
    return calcOffset(offsetStr, offsetStr.split(":"));
  } catch {
    // Fallback to manual parsing if the runtime doesn't support ±HH:MM/±HHMM/±HH
    // See: https://github.com/nodejs/node/issues/53419
    if (timeZone in offsetCache) return offsetCache[timeZone];
    const captures = timeZone?.match(offsetRe);
    if (captures) return calcOffset(timeZone, captures.slice(1));
    return NaN;
  }
}
const offsetRe = /([+-]\d\d):?(\d\d)?/;
function calcOffset(cacheStr, values) {
  const hours = +values[0];
  const minutes = +(values[1] || 0);
  return offsetCache[cacheStr] = hours > 0 ? hours * 60 + minutes : hours * 60 - minutes;
}

export { tzOffset };
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