const DAYS = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'];
const DAY_LABELS = {
  sun: 'Domingo',
  mon: 'Lunes',
  tue: 'Martes',
  wed: 'Miércoles',
  thu: 'Jueves',
  fri: 'Viernes',
  sat: 'Sábado',
};

export const DAY_KEYS = DAYS;
export const DAY_LABEL = DAY_LABELS;

function parseHM(str) {
  const [h, m] = str.split(':').map(Number);
  if (!Number.isFinite(h) || !Number.isFinite(m)) return null;
  return h * 60 + m;
}

function parseHours(raw) {
  if (!raw) return null;
  try {
    return typeof raw === 'string' ? JSON.parse(raw) : raw;
  } catch {
    return null;
  }
}

function findNextOpen(hours, now) {
  for (let offset = 1; offset <= 7; offset++) {
    const day = DAYS[(now.getDay() + offset) % 7];
    const range = hours[day];
    if (Array.isArray(range) && range.length === 2) {
      const openStr = range[0];
      if (offset === 1) return `mañana a las ${openStr}`;
      return `${DAY_LABELS[day]} a las ${openStr}`;
    }
  }
  return null;
}

export function getOpenStatus(rawHours, now = new Date()) {
  const hours = parseHours(rawHours);
  if (!hours) return null;

  const day = DAYS[now.getDay()];
  const range = hours[day];

  if (!Array.isArray(range) || range.length !== 2) {
    const next = findNextOpen(hours, now);
    return { status: 'closed', label: next ? `Cerrado · Abre ${next}` : 'Cerrado' };
  }

  const openMins = parseHM(range[0]);
  const closeMins = parseHM(range[1]);
  if (openMins == null || closeMins == null) return null;

  const nowMins = now.getHours() * 60 + now.getMinutes();

  if (nowMins < openMins) {
    return { status: 'closed', label: `Cerrado · Abre a las ${range[0]}` };
  }
  if (nowMins >= closeMins) {
    const next = findNextOpen(hours, now);
    return { status: 'closed', label: next ? `Cerrado · Abre ${next}` : 'Cerrado' };
  }
  return { status: 'open', label: `Abierto · Cierra a las ${range[1]}` };
}

export function emptyHours() {
  return { sun: null, mon: null, tue: null, wed: null, thu: null, fri: null, sat: null };
}