<?php declare(strict_types = 0);
/*
** WeCom Center - tiny portable i18n layer.
** Translations live in locale/<lang>.php and return a flat key=>string map.
** Whatever language Zabbix is running in is used automatically; any missing
** key (or language without a file) falls back to English, so the module
** "speaks" every Zabbix language while remaining easy to extend.
*/

namespace Modules\WecomCenter\Lib;

use CWebUser;

class I18n {

	private static string $locale_dir = '';
	private static array $strings = [];
	private static string $lang = 'en_US';

	public static function init(string $locale_dir): void {
		self::$locale_dir = rtrim($locale_dir, '/');
		self::$lang = self::currentLang();

		$en = self::loadFile('en');
		$loc = (self::$lang === 'en' || self::$lang === 'en_US') ? [] : self::loadFile(self::$lang);

		// English is the base; the active language overrides individual keys.
		self::$strings = array_merge($en, $loc);
	}

	private static function loadFile(string $lang): array {
		$file = self::$locale_dir.'/'.$lang.'.php';
		if (is_file($file)) {
			$data = include $file;
			if (is_array($data)) {
				return $data;
			}
		}
		return [];
	}

	/**
	 * Current frontend language, e.g. "zh_CN", "en_US", "ru_RU".
	 */
	public static function currentLang(): string {
		if (class_exists('CWebUser') && is_array(CWebUser::$data) && !empty(CWebUser::$data['lang'])) {
			return (string) CWebUser::$data['lang'];
		}
		return 'en_US';
	}

	public static function lang(): string {
		return self::$lang;
	}

	/**
	 * Translate a key. Placeholders {1},{2}... are replaced with $args.
	 */
	public static function t(string $key, array $args = []): string {
		$s = self::$strings[$key] ?? $key;
		foreach (array_values($args) as $i => $v) {
			$s = str_replace('{'.($i + 1).'}', (string) $v, $s);
		}
		return $s;
	}
}