export function gmmktime(
  hour?: number | string,
  minute?: number | string,
  second?: number | string,
  month?: number | string,
  day?: number | string,
  year?: number | string,
): number | false {
  //      discuss at: https://locutus.io/php/gmmktime/
  // parity verified: PHP 8.3
  //     original by: Brett Zamir (https://brett-zamir.me)
  //     original by: mktime
  //       example 1: gmmktime(14, 10, 2, 2, 1, 2008)
  //       returns 1: 1201875002
  //       example 2: gmmktime(0, 0, -1, 1, 1, 1970)
  //       returns 2: -1

  const d = new Date()
  const resolved: [number, number, number, number, number, number] = [
    d.getUTCHours(),
    d.getUTCMinutes(),
    d.getUTCSeconds(),
    d.getUTCMonth() + 1, // +1 to fix JS months.
    d.getUTCDate(),
    d.getUTCFullYear(),
  ]
  const input: [
    number | string | undefined,
    number | string | undefined,
    number | string | undefined,
    number | string | undefined,
    number | string | undefined,
    number | string | undefined,
  ] = [hour, minute, second, month, day, year]

  for (let i = 0; i < input.length; i++) {
    const value = input[i]
    if (typeof value !== 'undefined') {
      const parsed = Number.parseInt(String(value), 10)
      if (Number.isNaN(parsed)) {
        return false
      }
      resolved[i] = parsed
    }
  }

  // Map years 0-69 to 2000-2069 and years 70-100 to 1970-2000.
  const normalizedYear =
    resolved[5] + (resolved[5] >= 0 ? (resolved[5] <= 69 ? 2000 : resolved[5] <= 100 ? 1900 : 0) : 0)

  // Set year, month (-1 to fix JS months), and date.
  // !This must come before the call to setHours!
  d.setUTCFullYear(normalizedYear, resolved[3] - 1, resolved[4])

  // Set hours, minutes, and seconds.
  d.setUTCHours(resolved[0], resolved[1], resolved[2])

  const time = d.getTime()

  // Divide milliseconds by 1000 to return seconds and drop decimal.
  // Add 1 second if negative or it'll be off from PHP by 1 second.
  return ((time / 1e3) >> 0) - Number(time < 0)
}