export const currentDaytime = function(): string {
  const currentHour = new Date().getHours()

  if (currentHour >= 0 && currentHour < 12) {
    return 'morning'
  } else if (currentHour >= 12 && currentHour < 18) {
    return 'day'
  }
  return 'evening'
}

export function relativeTimeFromDate(date: Date): {val: number, range: Intl.RelativeTimeFormatUnit} | undefined {
  const units: {unit: Intl.RelativeTimeFormatUnit; ms: number}[] = [
    {unit: "year", ms: 31536000000},
    {unit: "month", ms: 2628000000},
    {unit: "day", ms: 86400000},
    {unit: "hour", ms: 3600000},
    {unit: "minute", ms: 60000},
    {unit: "second", ms: 1000},
  ];

  const elapsed = date.getTime() - new Date().getTime();
  for (const {unit, ms} of units) {
    if (Math.abs(elapsed) >= ms || unit === "second") {
      return {val: Math.round(elapsed / ms), range: unit};
    }
  }
  return undefined;
}