<?php
/**
 * The front-end locale follows the page language: <html lang>, and the
 * translation files WordPress, the theme and plugins load.
 */

declare( strict_types = 1 );

namespace AddBlack\Lang\Frontend;

defined( 'ABSPATH' ) || exit;

use AddBlack\Lang\Hookable;
use AddBlack\Lang\Hooks;
use AddBlack\Lang\Routing\CurrentLanguage;
use AddBlack\Lang\Settings\SettingsRepository;

final class Locale implements Hookable {

	public function __construct(
		private readonly CurrentLanguage $current,
		private readonly SettingsRepository $settings
	) {}

	public function register(): void {
		Hooks::filter( 'locale', array( $this, 'locale' ) );
	}

	public function locale( mixed $locale ): mixed {
		if ( is_admin() ) {
			return $locale;
		}
		$lang = $this->current->get();
		if ( '' === $lang ) {
			return $locale;
		}
		$wp_locale = $this->settings->get()->language( $lang )->locale ?? '';
		return '' !== $wp_locale ? $wp_locale : $locale;
	}
}