<?php

    session_start();

    $supported_languages = array("fr" => 1, "en" => 1);

    function load($language) {
        $datafile_fd = fopen("messages.$language", "r");
        $messages = array();
        while (!feof($datafile_fd) && ($line = fgets($datafile_fd, 4096))) {
            $ary = explode('=', $line, 2);
            if (count($ary) == 2) {
                $messages[$ary[0]] = trim($ary[1]);
            }
        }
        fclose($datafile_fd);
        return $messages;
    }

    function t($msg) {
        global $language;
        global $messages_language;
        global $messages_default;
        if (!$messages_language) {
            $messages_language = load($language);
        }
        if (!$messages_default) {
            $messages_default = load('en');
        }
        if (isset($messages_language[$msg])) {
            $msg = $messages_language[$msg];
        } else {
            error_log("ERROR " . $msg . " missing in " . $language);
            if (isset($messages_default[$msg])) {
                $msg = $messages_default[$msg];
            } else {
                error_log("ERROR " . $msg . " missing in en");
                $msg = "???$msg???";
            }
        }
        for ($i = 0; $i < func_num_args() - 1; $i++){
            $arg = func_get_arg($i+1);
            $msg = preg_replace('/\{' . $i . '}/', $arg, $msg);
        }
        return $msg;
    }

    $language = $_SESSION['language'];
    if (isset($_REQUEST['language']) && $supported_languages[$_REQUEST['language']]) { 
        $language = $_REQUEST['language'];
    } 
    if (!$language && $_SERVER['HTTP_ACCEPT_LANGUAGE']) { 
        $accepted = explode( ",", $_SERVER['HTTP_ACCEPT_LANGUAGE']); 
        for ($i = 0; $i < count($accepted); $i++) { 
            $entry = explode(";", $accepted[$i]);
            $lang = $entry[0];
            if ($supported_languages[$lang]) { 
                $language = $lang;
                break;
            } 
        } 
    }
    if (!$language) {
        $language = 'en';
    }
    $_SESSION['language'] = $language;

?>