// assets/scripts/duration.js

export const DURATION_CONFIG = {
  roundToQuarter: true,
};

export function parseDuration(input) {
  input = String(input).trim();

  if (!input || input === '0' || input === '0:00') return 0;

  // "8 12" -> von 8 bis 12 Uhr
  if (/^\d+\s+\d+$/.test(input)) {
    const parts = input.split(/\s+/).map(Number);
    return Math.max(0, (parts[1] - parts[0]) * 60);
  }

  // "1:30" -> Stunden:Minuten
  if (input.includes(':')) {
    const [h, m] = input.split(':').map(s => parseInt(s, 10) || 0);
    return h * 60 + m;
  }

  // "1,75" oder "1.75" -> Dezimalstunden
  if (input.includes(',') || input.includes('.')) {
    const hours = parseFloat(input.replace(',', '.'));
    return isNaN(hours) ? 0 : Math.round(hours * 60);
  }

  // "2" -> 2 Stunden
  const hours = parseInt(input, 10);
  return isNaN(hours) ? 0 : hours * 60;
}

export function roundToQuarter(minutes) {
  if (!DURATION_CONFIG.roundToQuarter) return minutes;
  if (minutes === 0) return 0;
  const interval = window.TT?.trackingInterval ?? window.Report?.trackingInterval ?? 15;
  return Math.ceil(minutes / interval) * interval;
}

export function formatMinutes(minutes) {
  const h = Math.floor(minutes / 60);
  const m = minutes % 60;
  return `${h}:${String(m).padStart(2, '0')}`;
}

export function validateDuration(minutes) {
  if (minutes > 1440) return { status: 'error' };
  if (minutes > 480)  return { status: 'warn' };
  return { status: 'ok' };
}

export function parseAndValidate(raw) {
  const minutes   = roundToQuarter(parseDuration(raw));
  const formatted = formatMinutes(minutes);

  if (minutes === 0) return { minutes, formatted, error: 'errorZeroDuration' };

  const v = validateDuration(minutes);
  if (v.status === 'error') return { minutes, formatted, error: 'errorDurationTooLong' };
  if (v.status === 'warn')  return { minutes, formatted, warn: 'warnDurationLong' };

  return { minutes, formatted };
}

export function initDurationBlurHandler() {
  document.addEventListener('blur', e => {
    if (!(e.target instanceof Element)) return;
    if (!e.target.matches('#create-duration, .edit-duration')) return;

    const minutes  = roundToQuarter(parseDuration(e.target.value));
    e.target.value = formatMinutes(minutes);
  }, true);
}