<?PHP
/**
 * patTemplate modfifier Number 2 String: N2S
 *
 * $Id$
 *
 * @package     patTemplate
 * @package     Modifiers
 * @author      gERD Schaufelberger <gerd@php-tools.net>
 */

/**
 * patTemplate modfifier Number 2 String: N2S
 *
 * Convert number to string
 *
 * @package     patTemplate
 * @package     Modifiers
 * @author      gERD Schaufelberger <gerd@php-tools.net>
 */
class patTemplate_Modifier_N2s extends patTemplate_Modifier
{
    const CAST_TYPE_INT     =   'int';
    const CAST_TYPE_FLOAT   =   'float';
    const CAST_TYPE_DATE    =   'date';

    const COMPARE_LOWERTHAN     =   'lt';
    const COMPARE_LOWEREQUAL    =   'le';
    const COMPARE_GREATEREQUAL  =   'ge';
    const COMPARE_GREATERTHAN   =   'gt';

    /**
     * Cast Type
     * @var string
     */
     private $castType;

    /**
     * Modify the value
     *
     * Parameter:
     *  - threshold: comma separated list of threshold values from lowest to highest
     *  - string: comma separated list of string values - there must be one more string than thresholds
     *  - cast: int, float or date
     *
     * @param	string		value
     * @return	string		modified value
     */
    public function modify($value, $params = array())
    {
        $params =   array_merge(array(
                            'threshold' =>  '1',
                            'string'    =>  'lower,higher',
                            'cast'      =>  self::CAST_TYPE_INT,
                            'compare'   =>  self::COMPARE_GREATEREQUAL
                    ), $params);

        $this->castType =   $params['cast'];

        $threshold  =   array_map(array($this, 'cast'), explode(',', $params['threshold']));
        $string     =   explode(',', $params['string']);

        $value  =   $this->cast($value);
        for ($i = count($threshold) - 1; $i >= 0; --$i) {

            switch ($params['compare']) {
                case self::COMPARE_LOWERTHAN:
                    if ($value < $threshold[$i]) {
                        return $string[$i + 1];
                    }
                    break;

                case self::COMPARE_LOWEREQUAL:
                    if ($value <= $threshold[$i]) {
                        return $string[$i + 1];
                    }
                    break;

                case self::COMPARE_GREATERTHAN:
                    if ($value > $threshold[$i]) {
                        return $string[$i + 1];
                    }
                    break;

                case self::COMPARE_GREATEREQUAL:
                default:
                    if ($value >= $threshold[$i]) {
                        return $string[$i + 1];
                    }
                    break;
            }
        }
        return $string[0];
    }

    /**
     * Cast Type
     *
     * Cast to some numeric value to make them comparable
     * @param string $v
     * @return int|float
     */
    private function cast($v)
    {
        switch ($this->castType) {
            case self::CAST_TYPE_DATE:
                return strtotime($v);
                break;

            case self::CAST_TYPE_FLOAT:
                return floatval($v);
                break;

            case self::CAST_TYPE_INT:
            default:
                break;
        }
        return intval($v);

    }
}