// Copyright 2017-2025 @pezkuwi/util authors & contributors
// SPDX-License-Identifier: Apache-2.0

import type { Time } from './types.js';

const MIN_MS = 60 * 1000;
const HR_MS = MIN_MS * 60;
const DAY_MS = HR_MS * 24;
const ZERO: Time = { days: 0, hours: 0, milliseconds: 0, minutes: 0, seconds: 0 };

/** @internal */
function add (a: Partial<Time>, b: Time): Time {
  return {
    days: (a.days || 0) + b.days,
    hours: (a.hours || 0) + b.hours,
    milliseconds: (a.milliseconds || 0) + b.milliseconds,
    minutes: (a.minutes || 0) + b.minutes,
    seconds: (a.seconds || 0) + b.seconds
  };
}

/** @internal */
function extractSecs (ms: number): Time {
  const s = ms / 1000;

  if (s < 60) {
    const seconds = ~~s;

    return add({ seconds }, extractTime(ms - (seconds * 1000)));
  }

  const m = s / 60;

  if (m < 60) {
    const minutes = ~~m;

    return add({ minutes }, extractTime(ms - (minutes * MIN_MS)));
  }

  const h = m / 60;

  if (h < 24) {
    const hours = ~~h;

    return add({ hours }, extractTime(ms - (hours * HR_MS)));
  }

  const days = ~~(h / 24);

  return add({ days }, extractTime(ms - (days * DAY_MS)));
}

/**
 * @name extractTime
 * @summary Convert a quantity of seconds to Time array representing accumulated {days, minutes, hours, seconds, milliseconds}
 * @example
 * <BR>
 *
 * ```javascript
 * import { extractTime } from '@pezkuwi/util';
 *
 * const { days, minutes, hours, seconds, milliseconds } = extractTime(6000); // 0, 0, 10, 0, 0
 * ```
 */
export function extractTime (milliseconds?: number): Time {
  return !milliseconds
    ? ZERO
    : milliseconds < 1000
      ? add({ milliseconds }, ZERO)
      : extractSecs(milliseconds);
}