<?php

namespace {

    class Yii
    {
        /** @var object */
        public static $app;

        /** @var array<string, array<string, array<string, string>>> */
        private static array $messages = [];

        /** @var string */
        public static string $language = 'ru';

        /** @var array<string> */
        public static array $supportedLanguages = ['ru', 'en'];

        /**
         * Initialize i18n and mock Yii::$app
         *
         * @param string $defaultLang
         */
        public static function init(string $defaultLang = 'ru'): void
        {
            $lang = null;

            // // 1. Language from query parameter (e.g. ?lang=en)
            // if (!empty($_GET['lang']) && is_string($_GET['lang'])) {
            //     $candidate = strtolower(trim($_GET['lang']));
            //     if (in_array($candidate, self::$supportedLanguages, true)) {
            //         $lang = $candidate;
            //     }
            // }

            // // 2. Language from cookie
            // if ($lang === null && !empty($_COOKIE['lang']) && is_string($_COOKIE['lang'])) {
            //     $candidate = strtolower(trim($_COOKIE['lang']));
            //     if (in_array($candidate, self::$supportedLanguages, true)) {
            //         $lang = $candidate;
            //     }
            // }

            // // 3. Language from Accept-Language header
            // if ($lang === null && !empty($_SERVER['HTTP_ACCEPT_LANGUAGE']) && is_string($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
            //     $candidate = strtolower(substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2));
            //     if (in_array($candidate, self::$supportedLanguages, true)) {
            //         $lang = $candidate;
            //     }
            // }

            $lang = 'ru';

            self::$language = $lang ?? $defaultLang;
        }

        /**
         * Translates a message to the specified language.
         *
         * @param string $category Message category (e.g. 'app', 'error')
         * @param string $message The message to be translated
         * @param array $params Parameters to replace in the message
         * @param string|null $language Target language, or null for current
         * @return string
         */
        public static function t(string $category, string $message, array $params = [], ?string $language = null): string
        {
            $lang = $language ?: self::$language;

            if (!isset(self::$messages[$lang][$category])) {
                $file = __DIR__ . '/messages/' . $lang . '/' . $category . '.php';
                if (file_exists($file)) {
                    self::$messages[$lang][$category] = (array)(require $file);
                } else {
                    self::$messages[$lang][$category] = [];
                }
            }

            $translation = self::$messages[$lang][$category][$message] ?? $message;

            // Handle Yii2 deprecated/empty marker
            if ($translation === '' || (is_string($translation) && strncmp($translation, '@@', 2) === 0)) {
                $translation = $message;
            }

            if (!empty($params)) {
                $replace = [];
                foreach ($params as $key => $value) {
                    $replace['{' . $key . '}'] = (string)$value;
                }
                $translation = strtr($translation, $replace);
            }

            return $translation;
        }
    }

    /**
     * Standalone shorthand helper for translations
     */
    if (!function_exists('t')) {
        function t(string $category, string $message, array $params = [], ?string $language = null): string
        {
            return Yii::t($category, $message, $params, $language);
        }
    }
}