(function () {
  type second = number;
  type millisecond = number;

  const relative = new Intl.RelativeTimeFormat("en", {
    localeMatcher: "best fit",
    numeric: "always",
    style: "long",
  });

  const date = () => {
    [...document.querySelectorAll("time")]
      .forEach(
        (element) => {
          try {
            const time: millisecond = new Date(element.dateTime) || new Date();
            const interval: second = ((new Date().getTime() - time.getTime()) / 1000);

            const seconds: number = Math.floor(interval);
            const minutes: number = Math.floor(seconds / 60);
            const hours:   number = Math.floor(minutes / 60);
            const days:    number = Math.floor(hours   / 24);

            if (Math.sign(seconds) === 1) {
              if (seconds <= 60)  { return element.textContent = relative.format(-1 * seconds, "second",); }
              if (minutes <= 120) { return element.textContent = relative.format(-1 * minutes, "minute",); }
              if (hours   <= 48)  { return element.textContent = relative.format(-1 * hours,   "hour",);   }
              if (days    <= 60)  { return element.textContent = relative.format(-1 * days,    "day",);    }
            }

            if (Math.sign(seconds) === -1) {
              if (-1 * days    >= 60)  { return element.textContent = relative.format(-1 * days,    "day",);    }
              if (-1 * hours   >= 48)  { return element.textContent = relative.format(-1 * hours,   "hour",);   }
              if (-1 * minutes >= 120) { return element.textContent = relative.format(-1 * minutes, "minute",); }
              if (-1 * seconds >= 0)   { return element.textContent = relative.format(-1 * seconds, "second",); }
            }

          } catch (error) {
            console.error(
              "Error: Unable to resolve relative time format!",
              error,
            );
          }
        },
      );
  }

  const substitution = setInterval(date, 4);

  self.addEventListener("load", () => {
    setTimeout(() => {
      clearInterval(substitution);
      setInterval(date, 1000);
    }, 1000);
  });
})();