<?php

/**
 * UTF8::str_pad
 *
 * @package    Kohana
 * @author     Kohana Team
 * @copyright  (c) 2007-2012 Kohana Team
 * @copyright  (c) 2005 Harry Fuecks
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
 */
function _str_pad($str, $final_str_length, $pad_str = ' ', $pad_type = STR_PAD_RIGHT)
{
    if (UTF8::is_ascii($str) AND UTF8::is_ascii($pad_str))
        return str_pad($str, $final_str_length, $pad_str, $pad_type);

    $str_length = UTF8::strlen($str);

    if ($final_str_length <= 0 OR $final_str_length <= $str_length)
        return $str;

    $pad_str_length = UTF8::strlen($pad_str);
    $pad_length = $final_str_length - $str_length;

    if ($pad_type == STR_PAD_RIGHT) {
        $repeat = ceil($pad_length / $pad_str_length);
        return UTF8::substr($str . str_repeat($pad_str, $repeat), 0, $final_str_length);
    }

    if ($pad_type == STR_PAD_LEFT) {
        $repeat = ceil($pad_length / $pad_str_length);
        return UTF8::substr(str_repeat($pad_str, $repeat), 0, floor($pad_length)) . $str;
    }

    if ($pad_type == STR_PAD_BOTH) {
        $pad_length /= 2;
        $pad_length_left = floor($pad_length);
        $pad_length_right = ceil($pad_length);
        $repeat_left = ceil($pad_length_left / $pad_str_length);
        $repeat_right = ceil($pad_length_right / $pad_str_length);

        $pad_left = UTF8::substr(str_repeat($pad_str, $repeat_left), 0, $pad_length_left);
        $pad_right = UTF8::substr(str_repeat($pad_str, $repeat_right), 0, $pad_length_right);
        return $pad_left . $str . $pad_right;
    }

    throw new UTF8_Exception("UTF8::str_pad: Unknown padding type (:pad_type)", [
    ':pad_type' => $pad_type,
    ]);
}
