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<?php
/**
 * Kunena Component
 * @package Kunena.Framework
 *
 * @copyright (C) 2008 - 2016 Kunena Team. All rights reserved.
 * @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
 * @link https://www.kunena.org
 **/
defined ( '_JEXEC' ) or die ();

jimport ( 'joomla.utilities.date' );

/**
 * Class KunenaDate
 */
class KunenaDate extends JDate
{
	public static function getInstance($date = 'now', $tz = null)
	{
		return new KunenaDate($date, $tz);
	}

	public function toTimeAgo()
	{
		KUNENA_PROFILER ? KunenaProfiler::instance()->start('function '.__CLASS__.'::'.__FUNCTION__.'()') : null;
		$chunks = array (
			'y' => array (JText::_('COM_KUNENA_DATE_YEAR'), JText::_('COM_KUNENA_DATE_YEARS') ),
			'm' => array (JText::_('COM_KUNENA_DATE_MONTH'), JText::_('COM_KUNENA_DATE_MONTHS') ),
			'w' => array (JText::_('COM_KUNENA_DATE_WEEK'), JText::_('COM_KUNENA_DATE_WEEKS') ),
			'd' => array (JText::_('COM_KUNENA_DATE_DAY'), JText::_('COM_KUNENA_DATE_DAYS') ),
			'h' => array (JText::_('COM_KUNENA_DATE_HOUR'), JText::_('COM_KUNENA_DATE_HOURS') ),
			'i' => array (JText::_('COM_KUNENA_DATE_MINUTE'), JText::_('COM_KUNENA_DATE_MINUTES') ) );

		// we only want to output two chunks of time here, eg: "x years, xx months" or "x days, xx hours"
		$tick = 0;
		$output = '';
		$diff = $this->diff(new JDate);

		foreach ($diff as $name=>$count)
		{
			if ($name == 'd')
			{
				// Days are special case as we want to break it into weeks and days.
				$weeks = (int) ($count / 7);

				if ($weeks)
				{
					$count %= 7;
					$output .= ($weeks == 1) ? " 1 {$chunks['w'][0]}" : " {$weeks} {$chunks['w'][1]}";

					if (2 == ++$tick)
					{
						break;
					}
				}
			}

			if (!$count || !isset($chunks[$name]))
			{
				continue;
			}

			$output .= ($count == 1) ? " 1 {$chunks[$name][0]}" : " {$count} {$chunks[$name][1]}";

			if (2 == ++$tick)
			{
				break;
			}
		}

		if (!$output)
		{
			$output .= JText::_('COM_KUNENA_LIB_TIME_NOW');
		}
		else
		{
			$output = JText::sprintf('COM_KUNENA_LIB_TIME_AGO', trim($output));
		}

		KUNENA_PROFILER ? KunenaProfiler::instance()->stop('function '.__CLASS__.'::'.__FUNCTION__.'()') : null;

		return $output;
	}

	public function toTimezone()
	{
		$timezone = $this->getOffsetFromGMT(true);

		return sprintf('%+d:%02d', $timezone, ($timezone*60)%60);
	}

	public function toSpan($mode = 'datetime_today', $title = 'ago', $offset = false, $class='')
	{
		return '<span class="kdate '.$class.'" title="'.$this->toKunena($title, $offset).'">'.$this->toKunena($mode, $offset).'</span>';
	}

	public function toKunena($mode = 'datetime_today', $offset = false)
	{
		if ($this->format('Y')<1902)
		{
			return JText::_('COM_KUNENA_LIB_DATETIME_UNKNOWN');
		}

		if (preg_match ( '/^config_/', $mode ) == 1)
		{
			$option = substr ( $mode, 7 );
			$mode = KunenaFactory::getConfig ()->$option;
		}

		$modearr = explode ( '_', $mode );
		$dateformat = strtolower ($modearr[0]);
		$time = false;

		switch ($dateformat)
		{
			case 'none' :
				return '';
			case 'ago' :
				return $this->toTimeAgo();
			case 'time' :
				$time = true;
				$usertime_format = JText::_('COM_KUNENA_LIB_TIME_FMT');
				break;
			case 'date' :
				$usertime_format = JText::_('COM_KUNENA_LIB_DATE_FMT');
				break;
			case 'datetime':
				$time = true;
				$usertime_format = JText::_('COM_KUNENA_LIB_DATETIME_FMT');
				break;
			default:
				$usertime_format = $mode;
		}

		if (!$offset)
		{
			$app = JFactory::getApplication ();
			$my = JFactory::getUser();
			if ($my->id) $offset = $my->getParam('timezone', $app->getCfg ( 'offset', 'utc' ));
			else $offset = $app->getCfg ( 'offset', 'utc' );
		}

		try
		{
			$offset = new DateTimeZone($offset);
			$this->setTimezone($offset);
		}
		catch (Exception $e)
		{
			trigger_error('Kunena: Timezone issue!');
		}

		// Today and Yesterday?
		if (end($modearr) == 'today')
		{
			$now = JFactory::getDate('now');

			if ($offset)
			{
				$now->setTimezone($offset);
			}

			$now = @getdate ( $now->toUnix(true) );
			$then = @getdate ( $this->toUnix(true) );

			// Same day of the year, same year.... Today!
			if ($then ['yday'] == $now ['yday'] &&
				$then ['year'] == $now ['year'])
			{
				return trim(JText::sprintf('COM_KUNENA_LIB_DATE_TODAY', $time ? $this->format(JText::_('COM_KUNENA_LIB_TIME_FMT'), true) : ''));
			}

			// Day-of-year is one less and same year, or it's the first of the year and that's the last of the year...
			if (($then ['yday'] == $now ['yday'] - 1 && $then ['year'] == $now ['year']) ||
				($now ['yday'] == 0 && $then ['year'] == $now ['year'] - 1) && $then ['mon'] == 12 && $then ['mday'] == 31)
			{
				return trim(JText::sprintf('COM_KUNENA_LIB_DATE_YESTERDAY', $time ? $this->format(JText::_('COM_KUNENA_LIB_TIME_FMT'), true) : ''));
			}
		}

		return $this->format($usertime_format, true);
	}
}