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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2011 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\HTML\Helpers;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Date\Date as DateHelper;
use Joomla\CMS\HTML\HTMLHelper;
use Joomla\CMS\Language\Text;

/**
 * Extended Utility class for handling date display.
 *
 * @since  2.5
 */
abstract class Date
{
	/**
	 * Function to convert a static time into a relative measurement
	 *
	 * @param   string  $date    The date to convert
	 * @param   string  $unit    The optional unit of measurement to return
	 *                           if the value of the diff is greater than one
	 * @param   string  $time    An optional time to compare to, defaults to now
	 * @param   string  $format  An optional format for the HTMLHelper::date output
	 *
	 * @return  string  The converted time string
	 *
	 * @since   2.5
	 */
	public static function relative($date, $unit = null, $time = null, $format = null)
	{
		if ($time === null)
		{
			// Get now
			$time = new DateHelper('now');
		}

		// Get the difference in seconds between now and the time
		$diff = strtotime($time) - strtotime($date);

		// Less than a minute
		if ($diff < 60)
		{
			return Text::_('JLIB_HTML_DATE_RELATIVE_LESSTHANAMINUTE');
		}

		// Round to minutes
		$diff = round($diff / 60);

		// 1 to 59 minutes
		if ($diff < 60 || $unit === 'minute')
		{
			return Text::plural('JLIB_HTML_DATE_RELATIVE_MINUTES', $diff);
		}

		// Round to hours
		$diff = round($diff / 60);

		// 1 to 23 hours
		if ($diff < 24 || $unit === 'hour')
		{
			return Text::plural('JLIB_HTML_DATE_RELATIVE_HOURS', $diff);
		}

		// Round to days
		$diff = round($diff / 24);

		// 1 to 6 days
		if ($diff < 7 || $unit === 'day')
		{
			return Text::plural('JLIB_HTML_DATE_RELATIVE_DAYS', $diff);
		}

		// Round to weeks
		$diff = round($diff / 7);

		// 1 to 4 weeks
		if ($diff <= 4 || $unit === 'week')
		{
			return Text::plural('JLIB_HTML_DATE_RELATIVE_WEEKS', $diff);
		}

		// Over a month, return the absolute time
		return HTMLHelper::_('date', $date, $format);
	}
}