<?php
# -*- coding: utf-8 -*-

class utils
{
    static private $_base_url_path = '';
    static private $secret_key = 's_N{{d\z#YH<OqJRS7ED(zAJJT_>/8 ';

    static public function getBaseUrl()
    {
        if (empty($_SERVER['HTTP_HOST']))
            return 'http://localhost/';

        return 'http'
            .   (!empty($_SERVER['HTTPS']) ? 's' : '')
            .   '://'
            .   $_SERVER['HTTP_HOST']
            .   self::getBaseUrlPath();
    }

    static public function getBaseUrlPath()
    {
        if (!empty(self::$_base_url_path))
            return self::$_base_url_path;

        $uri = dirname($_SERVER['SCRIPT_NAME']);

        if (substr($uri, -6) == '/admin')
        {
            $uri = dirname($uri);
        }

        if (substr($uri, -1) != '/')
        {
            $uri .= '/';
        }

        self::$_base_url_path = $uri;

        return $uri;
    }

    static public function makeUriFromTitle($str)
    {
        $str = utf8_decode($str);
        $str = strtr($str,
        "ÀÁÂÃÄÅàáâãäåÇçÒÓÔÕÖØòóôõöøÈÉÊËèéêëÌÍÎÏìíîïÙÚÛÜùúûü¾ÝÿýÑñ",
        "AAAAAAaaaaaaCcOOOOOOooooooEEEEeeeeIIIIiiiiUUUUuuuuYYyyNn");

        $str = str_replace('Æ','AE',$str);
        $str = str_replace('æ','ae',$str);
        $str = str_replace('¼','OE',$str);
        $str = str_replace('½','oe',$str);

        $str = preg_replace('/[^A-Za-z0-9_\s\'\:\/\[\]-]/', '', $str);

        $str = preg_replace('/[\s\'\:\/\[\]-]+/',' ',trim($str));

        if (isset($str[64]))
        {
            $str = substr($str, 0, 64);
            $str = substr($str, 0, strrpos($str, ' '));
        }

        $str = str_replace(' ','-',$str);
        return $str;
    }

    static public function baseConv($num, $base=62, $index=false)
    {
        if (!$index)
            $index = substr("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", 0, $base);

        $out = "";
        for ($t = floor(log10($num) / log10($base)); $t >= 0; $t--)
        {
            $a = floor($num / pow($base, $t));
            $out = $out . substr($index, $a, 1);
            $num = $num - ($a * pow($base, $t));
        }

        return $out;
    }

    static public function baseConvReverse($num, $base=62, $index=false)
    {
        if (!$index)
            $index = substr("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", 0, $base);

        $out = 0;
        $len = strlen($num) - 1;

        for ($t = 0; $t <= $len; $t++)
        {
            $out = $out + strpos($index, substr($num, $t, 1)) * pow($base, $len - $t);
        }

        return $out;
    }

    static public function id2url($id)
    {
        return self::baseConv($id);
    }

    static public function url2id($url)
    {
        return self::baseConvReverse($url);
    }

    public static function CSRF_create($id)
    {
        if (!isset($_SESSION))
        {
            @session_start();
        }

        if (!isset($_SESSION['csrf_protect']))
        {
            $_SESSION['csrf_protect'] = array();
        }

        $_SESSION['csrf_protect'][$id] = array(
            'created' => time(),
            'check' => md5(self::$secret_key . $id . time())
        );

        return $_SESSION['csrf_protect'][$id]['check'];
    }

    public static function CSRF_check($id, $hash)
    {
        if (!isset($_SESSION) && isset($_COOKIE[session_name()]))
        {
            @session_start();
        }

        if (!isset($_SESSION['csrf_protect'][$id]))
        {
            return false;
        }

        if ($_SESSION['csrf_protect'][$id]['check'] == $hash)
        {
            unset($_SESSION['csrf_protect'][$id]);
            return true;
        }

        return false;
    }

    /**
     * Génération pagination à partir de la page courante ($current),
     * du nombre d'items total ($total), et du nombre d'items par page ($bypage).
     * $listLength représente la longueur d'items de la pagination à génerer
     *
     * @param int $current
     * @param int $total
     * @param int $bypage
     * @param int $listLength
     * @param bool $showLast Toggle l'affichage du dernier élément de la pagination
     * @return array
     */
    public static function getGenericPagination($current, $total, $bypage, $listLength=11, $showLast = true)
    {
        if ($total <= $bypage)
            return false;

        $total = ceil($total / $bypage);

        if ($total < $current)
            return false;

        $length = ($listLength / 2);

        $begin = $current - ceil($length);
        if ($begin < 1)
        {
            $begin = 1;
        }

        $end = $begin + $listLength;
        if($end > $total)
        {
            $begin -= ($end - $total);
            $end = $total;
        }
        if ($begin < 1)
        {
            $begin = 1;
        }
        if($end==($total-1)) {
            $end = $total;
        }
        if($begin == 2) {
            $begin = 1;
        }
        $out = array();

        if ($current > 1) {
            $out[] = array('id' => $current - 1, 'label' =>  'Â« ' . 'Page prÃ©cÃ©dente', 'class' => 'prev', 'accesskey' => 'a');
        }

        if ($begin > 1) {
            $out[] = array('id' => 1, 'label' => '1 ...', 'class' => 'first');
        }

        for ($i = $begin; $i <= $end; $i++)
        {
            $out[] = array('id' => $i, 'label' => $i, 'class' => ($i == $current) ? 'current' : '');
        }

        if ($showLast && $end < $total) {
            $out[] = array('id' => $total, 'label' => '... ' . $total, 'class' => 'last');
        }

        if ($current < $total) {
            $out[] = array('id' => $current + 1, 'label' => 'Page suivante' . ' Â»', 'class' => 'next', 'accesskey' => 'z');
        }

        return $out;
    }


    static public function checkLangCode($code)
    {
        return preg_match('!^[a-z]{2,3}$!', $code);
    }

    static public function getHttpLanguages()
    {
        if (empty($_SERVER['HTTP_ACCEPT_LANGUAGE']))
            return false;

        $http_lang = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
        $http_langs = explode(',', $http_lang);

        $langs = array();

        // On établit la liste des langues par priorité
        $qr = 100;
        foreach ($http_langs as $lang)
        {
            if (preg_match('!;q=(.*)!', $lang, $match))
            {
                $q = intval($match[1] * 100);
                $lang = str_replace($match[0], '', $lang);
            }
            else
            {
                $q = $qr--;
            }

            $lang = trim($lang);
            $langs[$q] = substr($lang, 0, 2);
        }

        krsort($langs);

        return $langs;
    }

    static public function redirect($url, $code=false, $exit=true)
    {
        if (empty($url) || !preg_match('!^https?://!', $destination))
        {
            $host = $_SERVER['HTTP_HOST'];

            if (empty($url))
                $url = 'http://' . $host . '/';
            else
                $url = 'http://' . $host . '/' . preg_replace('!^/!', '', $url);
        }

        if (headers_sent())
        {
            echo
              '<html>'.
              ' <head>' .
              '  <script type="text/javascript">' .
              '    document.location = "' . htmlspecialchars($url, ENT_QUOTES) . '";' .
              '  </script>' .
              ' </head>'.
              ' <body>'.
              '   <div>'.
              '     <a href="' . htmlspecialchars($url) . '">Cliquez ici pour continuer...</a>'.
              '   </div>'.
              ' </body>'.
              '</html>';
        }
        else
        {
            if ($code == 302)
                header('Status: 302 Moved Temporarily', true, 302);

            header('Location: '.$url);
        }

        if ($exit)
          exit;

        return true;
    }

    static public function parseContentPluginParams($str)
    {
        $attributes = array();
        $last_value = '';
        $state = 0;

        // matches double quoted strings:
        // "foobar"
        // "foo\"bar"
        // "foobar" . "foo\"bar"
        $_db_qstr_regexp = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"';

        // matches single quoted strings:
        // 'foobar'
        // 'foo\'bar'

        $_si_qstr_regexp = '\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\'';

        // matches single or double quoted strings
        $_qstr_regexp = '(?:' . $_db_qstr_regexp . '|' . $_si_qstr_regexp . ')';

        preg_match_all('/(?:' . $_qstr_regexp . ' | (?>[^"\'=\s]+))+|[=]/x', $str, $match);

        foreach ($match[0] as $value)
        {
            if ($state == 0)
            {
                if (!is_string($value))
                    throw new contentPluginException("Invalid attribute name '".$value."'.");

                $attr_name = $value;
                $state = 1;
            }
            elseif ($state == 1)
            {
                if ($value != '=')
                    throw new contentPluginException("Expecting '=' after '".$last_value."'");

                $state = 2;
            }
            elseif ($state == 2)
            {
                if ($value == '=')
                    throw new contentPluginException("Unexpected '=' after '".$last_value."'");

                if ($value == 'yes' || $value == 'on' || $value == 'true')
                    $value = true;
                elseif ($value == 'no' || $value == 'off' || $value == 'false')
                    $value = false;
                elseif ($value == 'null')
                    $value = null;
                elseif ($value[0] == '"' || $value[0] == "'")
                    $value = trim(substr($value, 1, -1));

                $attributes[$attr_name] = $value;

                $state = 0;
            }

            $last_value = $value;
        }

        if ($state == 1)
            throw new contentPluginException("Expecting '=' after '".$last_value."'");
        elseif ($state == 2)
            throw new contentPluginException("Missing attribute value after '".$last_value."'");

        return $attributes;
    }
}

?>