/*
 * Copyright (C) 2025 Jakub Žitník
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

// Rules: start and end in 24h format, interval in minutes
export const scheduleRules = [
  { start: "0:00",  end: "3:00",  interval: 180 },
  { start: "3:00",  end: "4:00",  interval: 60 },
  { start: "5:00",  end: "6:00",  interval: 30 },
  { start: "6:00",  end: "7:30",  interval: 15 },
  { start: "7:30",  end: "16:00", interval: 5 },
  { start: "16:00", end: "19:00", interval: 60 },
  { start: "19:00", end: "0:00",  interval: 180 }
];

export function toMinutes(timeStr) {
  const [h, m] = timeStr.split(":").map(Number);
  return h * 60 + (m || 0);
}

export function getCurrentInterval(date = new Date()) {
  const nowMinutes = date.getHours() * 60 + date.getMinutes();

  for (const rule of scheduleRules) {
    let startMin = toMinutes(rule.start);
    let endMin   = toMinutes(rule.end === "0:00" ? "24:00" : rule.end);

    // Handle wrap-around midnight
    if (endMin <= startMin) {
      if (nowMinutes >= startMin || nowMinutes < endMin) {
        return rule.interval;
      }
    } else {
      if (nowMinutes >= startMin && nowMinutes < endMin) {
        return rule.interval;
      }
    }
  }

  return null;
}