<?PHP
/**
 * patTemplate modfifier Date 2 Age
 *
 * $Id$
 *
 * @package     patTemplate
 * @package     Modifiers
 * @author      gERD Schaufelberger <gerd@php-tools.net>
 */

/**
 * patTemplate modfifier Date 2 Age
 *
 * Date string or unix time stamp to age in seconds
 *
 * @package     patTemplate
 * @package     Modifiers
 * @author      gERD Schaufelberger <gerd@php-tools.net>
 */
class patTemplate_Modifier_Date2age extends patTemplate_Modifier
{
    /**
     * modify the value
     * 
     * @param	string		value
     * @return	string		modified value
     */
	public function modify($value, $params = array())
	{
        // convert unix timestamp to ISO date
        if (!preg_match('/^[0-9]+$/', $value)) {
            $value  =   strtotime($value);
        }

        $compare    =   time();
        if (isset($params['compare'])) {
            $compare    =   $params['compare'];
            if (!preg_match('/^[0-9]+$/', $compare)) {
                $compare    =   strtotime($compare);
            }
        }
        $age    =   $compare - $value;
        
        // calculate age in minuts, hours, days, ...
        if (!isset($params['unit'])) {
            $params['unit'] =   's';
        }

        // use fall-through
        switch ($params['unit']) {
            case 'w':
            case 'week':
                $age    =   $age / 7;
            case 'd':
            case 'day':
                $age    =   $age / 24;
            case 'h':
            case 'hour':
                $age    =   $age / 60;
            case 'i':
            case 'minute':
                $age    =   $age / 60;
            default:
            case 's':
            case 'second':
                break;
        }

        if (!isset($params['precision'])) {
            $params['precision'] =   '0';
        }

        switch ($params['precision']) {
            case 'ceil':
                return ceil($age);
                break;

            case 'floor':
                return floor($age);
                break;
        }

        $params['precision']    =   intval($params['precision']);
        return round($age, $params['precision']);
	}
}