<?php
/**
 * ZenTaoPHP的helper类。
 * The helper class file of ZenTaoPHP framework.
 *
 * The author disclaims copyright to this source code. In place of
 * a legal notice, here is a blessing:
 * 
 *  May you do good and not evil.
 *  May you find forgiveness for yourself and forgive others.
 *  May you share freely, never taking more than you give.
 */

/**
 * 该类实现了一些常用的方法
 * The helper class, contains the tool functions.
 *
 * @package framework
 */
include dirname(__FILE__) . '/base/helper.class.php';
class helper extends baseHelper
{
    public static function getViewType($source = false)
    {
        global $config, $app;
        if($config->requestType != 'GET')
        {
            $pathInfo = $app->getPathInfo();
            if(!empty($pathInfo))
            {
                $dotPos = strrpos($pathInfo, '.');
                if($dotPos)
                {
                    $viewType = substr($pathInfo, $dotPos + 1);
                }
                else
                {
                    $config->default->view = $config->default->view == 'mhtml' ? 'html' : $config->default->view;
                }
            }
        }
        elseif($config->requestType == 'GET')
        {
            if(isset($_GET[$config->viewVar]))
            {
                $viewType = $_GET[$config->viewVar]; 
            }
            else
            {
                /* Set default view when url has not module name. such as only domain. */
                $config->default->view = ($config->default->view == 'mhtml' and isset($_GET[$config->moduleVar])) ? 'html' : $config->default->view;
            }
        }
        if($source and isset($viewType)) return $viewType;

        if(isset($viewType) and strpos($config->views, ',' . $viewType . ',') === false) $viewType = $config->default->view;
        return isset($viewType) ? $viewType : $config->default->view;
    }

    /**
     * Encode json for $.parseJSON
     * 
     * @param  array  $data 
     * @param  int    $options 
     * @static
     * @access public
     * @return string
     */
    static public function jsonEncode4Parse($data, $options = 0)
    {
        $json = json_encode($data);
        if($options) $json = str_replace(array("'", '"'), array('\u0027', '\u0022'), $json);

        $escapers     = array("\\",  "/",   "\"", "'", "\n",  "\r",  "\t", "\x08", "\x0c", "\\\\u");
        $replacements = array("\\\\", "\\/", "\\\"", "\'", "\\n", "\\r", "\\t",  "\\f",  "\\b", "\\u");
        return str_replace($escapers, $replacements, $json);
    }

    /**
     * Convert encoding.
     * 
     * @param  string $string 
     * @param  string $fromEncoding 
     * @param  string $toEncoding 
     * @static
     * @access public
     * @return string
     */
    static public function convertEncoding($string, $fromEncoding, $toEncoding = 'utf-8')
    {
        $toEncoding = str_replace('utf8', 'utf-8', $toEncoding);
        if(function_exists('mb_convert_encoding'))
        {
            /* Remove like utf-8//TRANSLIT. */
            $position = strpos($toEncoding, '//');
            if($position !== false) $toEncoding = substr($toEncoding, 0, $position);

            /* Check string encoding. */
            $encoding = strtolower(mb_detect_encoding($string, array('ASCII','UTF-8','GB2312','GBK','BIG5')));
            if($encoding == $toEncoding) return $string;
            return mb_convert_encoding($string, $toEncoding, $encoding);
        }
        elseif(function_exists('iconv'))
        {
            if($fromEncoding == $toEncoding) return $string;
            $convertString = @iconv($fromEncoding, $toEncoding, $string);
            /* iconv error then return original. */
            if(!$convertString) return $string;
            return $convertString;
        }

        return $string;
    }
}

/**
 * 检查是否是onlybody模式。
 * Check exist onlybody param.
 * 
 * @access public
 * @return void
 */
function isonlybody()
{
    return helper::inOnlyBodyMode();
}

/**
 * Format time.
 *
 * @param  int    $time
 * @param  string $format
 * @access public
 * @return void
 */
function formatTime($time, $format = '')
{
    $time = str_replace('0000-00-00', '', $time);
    $time = str_replace('00:00:00', '', $time);
    if(trim($time) == '') return ;
    if($format) return date($format, strtotime($time));
    return trim($time);
}