<?php
class Language {
    private static $translations = [];
    private static $currentLocale = 'ar';
    private static $fallbackLocale = 'en';
    private static $supportedLocales = ['ar', 'en'];
    
    public static function init($locale = null) {
        if ($locale && in_array($locale, self::$supportedLocales)) {
            self::$currentLocale = $locale;
        } elseif (isset($_SESSION['locale'])) {
            self::$currentLocale = $_SESSION['locale'];
        } else {
            // Try to detect from browser
            $browserLang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
            self::$currentLocale = in_array($browserLang, self::$supportedLocales) ? $browserLang : self::$fallbackLocale;
        }
        
        $_SESSION['locale'] = self::$currentLocale;
        self::loadTranslations();
    }
    
    public static function setLocale($locale) {
        if (in_array($locale, self::$supportedLocales)) {
            self::$currentLocale = $locale;
            $_SESSION['locale'] = $locale;
            self::loadTranslations();
            return true;
        }
        return false;
    }
    
    public static function getCurrentLocale() {
        return self::$currentLocale;
    }
    
    public static function isRTL() {
        return in_array(self::$currentLocale, ['ar']);
    }
    
    public static function getDirection() {
        return self::isRTL() ? 'rtl' : 'ltr';
    }
    
    public static function translate($key, $params = []) {
        $translation = self::$translations[self::$currentLocale][$key] ?? 
                      self::$translations[self::$fallbackLocale][$key] ?? 
                      $key;
        
        if (!empty($params)) {
            foreach ($params as $param => $value) {
                $translation = str_replace(':' . $param, $value, $translation);
            }
        }
        
        return $translation;
    }
    
    private static function loadTranslations() {
        // Load current locale
        $localePath = __DIR__ . '/../lang/' . self::$currentLocale . '.php';
        if (file_exists($localePath)) {
            self::$translations[self::$currentLocale] = require $localePath;
        }
        
        // Load fallback locale if different
        if (self::$currentLocale !== self::$fallbackLocale) {
            $fallbackPath = __DIR__ . '/../lang/' . self::$fallbackLocale . '.php';
            if (file_exists($fallbackPath)) {
                self::$translations[self::$fallbackLocale] = require $fallbackPath;
            }
        }
    }
    
    public static function getAllTranslations() {
        return self::$translations;
    }
    
    public static function getSupportedLocales() {
        return self::$supportedLocales;
    }
    
    // Helper function for date formatting
    public static function formatDate($timestamp, $format = 'full') {
        $locale = self::$currentLocale . '_' . strtoupper(self::$currentLocale);
        setlocale(LC_TIME, $locale . '.UTF-8');
        
        $formats = [
            'full' => '%A %d %B %Y',
            'long' => '%d %B %Y',
            'medium' => '%d %b %Y',
            'short' => '%d/%m/%Y'
        ];
        
        return strftime($formats[$format] ?? $formats['full'], $timestamp);
    }
    
    // Helper function for number formatting
    public static function formatNumber($number, $decimals = 0) {
        $locale = self::$currentLocale . '_' . strtoupper(self::$currentLocale);
        $formatter = new NumberFormatter($locale, NumberFormatter::DECIMAL);
        $formatter->setAttribute(NumberFormatter::FRACTION_DIGITS, $decimals);
        return $formatter->format($number);
    }
    
    // Helper function for currency formatting
    public static function formatCurrency($amount, $currency = 'EGP') {
        $locale = self::$currentLocale . '_' . strtoupper(self::$currentLocale);
        $formatter = new NumberFormatter($locale, NumberFormatter::CURRENCY);
        return $formatter->formatCurrency($amount, $currency);
    }
}