export function outputChronicDuration()

in app/assets/javascripts/chronic_duration.js [231:423]
172 lines of code
32 McCabe index (conditional complexity)

export function outputChronicDuration(seconds, opts = {}) {
  if (opts.hoursOnly) {
    const hours = Math.round(seconds / 3600);
    return `${hours}h`;
  }

  const units = {
    years: 0,
    months: 0,
    weeks: 0,
    days: 0,
    hours: 0,
    minutes: 0,
    seconds,
  };

  const hoursPerDay = opts.hoursPerDay || HOURS_PER_DAY;
  const daysPerMonth = opts.daysPerMonth || DAYS_PER_MONTH;
  const daysPerWeek = Math.trunc(daysPerMonth / FULL_WEEKS_PER_MONTH);

  const decimalPlaces =
    seconds % 1 !== 0 ? seconds.toString().split('.').reverse()[0].length : null;

  const minute = 60;
  const hour = 60 * minute;
  const day = hoursPerDay * hour;
  const month = daysPerMonth * day;
  const year = 31557600;

  if (units.seconds >= 31557600 && units.seconds % year < units.seconds % month) {
    units.years = Math.trunc(units.seconds / year);
    units.months = Math.trunc((units.seconds % year) / month);
    units.days = Math.trunc(((units.seconds % year) % month) / day);
    units.hours = Math.trunc((((units.seconds % year) % month) % day) / hour);
    units.minutes = Math.trunc(((((units.seconds % year) % month) % day) % hour) / minute);
    units.seconds = Math.trunc(((((units.seconds % year) % month) % day) % hour) % minute);
  } else if (seconds >= 60) {
    units.minutes = Math.trunc(seconds / 60);
    units.seconds %= 60;
    if (units.minutes >= 60) {
      units.hours = Math.trunc(units.minutes / 60);
      units.minutes = Math.trunc(units.minutes % 60);
      if (!opts.limitToHours) {
        if (units.hours >= hoursPerDay) {
          units.days = Math.trunc(units.hours / hoursPerDay);
          units.hours = Math.trunc(units.hours % hoursPerDay);
          if (opts.weeks) {
            if (units.days >= daysPerWeek) {
              units.weeks = Math.trunc(units.days / daysPerWeek);
              units.days = Math.trunc(units.days % daysPerWeek);
              if (units.weeks >= FULL_WEEKS_PER_MONTH) {
                units.months = Math.trunc(units.weeks / FULL_WEEKS_PER_MONTH);
                units.weeks = Math.trunc(units.weeks % FULL_WEEKS_PER_MONTH);
              }
            }
          } else if (units.days >= daysPerMonth) {
            units.months = Math.trunc(units.days / daysPerMonth);
            units.days = Math.trunc(units.days % daysPerMonth);
          }
        }
      }
    }
  }

  let joiner = opts.joiner || ' ';
  let process = null;

  let dividers;
  switch (opts.format) {
    case 'micro':
      dividers = {
        years: 'y',
        months: 'mo',
        weeks: 'w',
        days: 'd',
        hours: 'h',
        minutes: 'm',
        seconds: 's',
      };
      joiner = '';
      break;
    case 'short':
      dividers = {
        years: 'y',
        months: 'mo',
        weeks: 'w',
        days: 'd',
        hours: 'h',
        minutes: 'm',
        seconds: 's',
      };
      break;
    case 'long':
      dividers = {
        /* eslint-disable @gitlab/require-i18n-strings */
        years: ' year',
        months: ' month',
        weeks: ' week',
        days: ' day',
        hours: ' hour',
        minutes: ' minute',
        seconds: ' second',
        /* eslint-enable @gitlab/require-i18n-strings */
        pluralize: true,
      };
      break;
    case 'chrono':
      dividers = {
        years: ':',
        months: ':',
        weeks: ':',
        days: ':',
        hours: ':',
        minutes: ':',
        seconds: ':',
        keepZero: true,
      };
      process = (str) => {
        // Pad zeros
        // Get rid of lead off times if they are zero
        // Get rid of lead off zero
        // Get rid of trailing:
        const divider = ':';
        const processed = [];
        str.split(divider).forEach((n) => {
          if (n === '') {
            return;
          }
          // add zeros only if n is an integer
          if (n.search('\\.') >= 0) {
            processed.push(
              parseFloat(n)
                .toFixed(decimalPlaces)
                .padStart(3 + decimalPlaces, '0'),
            );
          } else {
            processed.push(n.padStart(2, '0'));
          }
        });
        return processed
          .join(divider)
          .replace(/^(00:)+/g, '')
          .replace(/^0/g, '')
          .replace(/:$/g, '');
      };
      joiner = '';
      break;
    default:
      dividers = {
        /* eslint-disable @gitlab/require-i18n-strings */
        years: ' yr',
        months: ' mo',
        weeks: ' wk',
        days: ' day',
        hours: ' hr',
        minutes: ' min',
        seconds: ' sec',
        /* eslint-enable @gitlab/require-i18n-strings */
        pluralize: true,
      };
      break;
  }

  let result = [];
  ['years', 'months', 'weeks', 'days', 'hours', 'minutes', 'seconds'].forEach((t) => {
    if (t === 'weeks' && !opts.weeks) {
      return;
    }
    let num = units[t];
    if (t === 'seconds' && num % 0 !== 0) {
      num = num.toFixed(decimalPlaces);
    } else {
      num = num.toString();
    }
    const keepZero = !dividers.keepZero && t === 'seconds' ? opts.keepZero : dividers.keepZero;
    const humanized = humanizeTimeUnit(num, dividers[t], dividers.pluralize, keepZero);
    if (humanized !== null) {
      result.push(humanized);
    }
  });

  if (opts.units) {
    result = result.slice(0, opts.units);
  }

  result = result.join(joiner);

  if (process) {
    result = process(result);
  }

  return result.length === 0 ? null : result;
}