<?php
// lang_helper.php
// Include this at the top of every page.
// Provides: $lang, $text, $en, $availableLangs

$availableLangs = array_map(
    fn($f) => basename($f, '.php'),
    glob(__DIR__ . '/lang/*.php')
);

function getLang($supported) {
    if (isset($_GET['lang']) && in_array($_GET['lang'], $supported)) {
        return $_GET['lang'];
    }
    $browser = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? 'nah', 0, 2);
    return in_array($browser, $supported) ? $browser : 'nah';
}

$lang = getLang($availableLangs);

$file = __DIR__ . "/lang/$lang.php";
if (!file_exists($file)) {
    $lang = 'nah';
    $file = __DIR__ . "/lang/nah.php";
}

$text = include $file;

// Always load English as translation source
$en = include __DIR__ . '/lang/en.php';