<?php
/**
 * AKSRT Scripts & Styles
 *
 * 前端资源加载：CSS、JS、内联样式变量
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Scripts {
    use AKSRT_Scripts_Part_1b;
    use AKSRT_Scripts_Part_2;


    private static $instance = null;

    private function __construct() {}

    public static function get_instance(): self {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function init(): void {
        add_action('wp_enqueue_scripts', [$this, 'enqueue_public']);
        add_action('admin_enqueue_scripts', [$this, 'enqueue_admin']);
        add_action('admin_enqueue_scripts', [$this, 'enqueue_passive_polyfill'], 1);
        add_action('wp_head', [$this, 'inline_css_vars']);
        add_action('wp_head', [$this, 'output_custom_codes']);
        add_action('wp_body_open', [$this, 'output_loading_overlay'], 1);
        add_action('wp_footer', [$this, 'output_custom_footer_codes'], 99);
        add_action('wp_ajax_aksrt_frontend_debug', [$this, 'handle_frontend_debug']);
        add_action('wp_ajax_nopriv_aksrt_frontend_debug', [$this, 'handle_frontend_debug']);
        add_action('wp_ajax_aksrt_search_history', [$this, 'handle_search_history']);
        add_action('wp_ajax_aksrt_search_suggestions', [$this, 'handle_search_suggestions']);
        add_action('wp_ajax_nopriv_aksrt_search_suggestions', [$this, 'handle_search_suggestions']);
        add_filter('body_class', [$this, 'body_classes']);
        add_filter('wp_resource_hints', [$this, 'resource_hints'], 10, 2);
    }

    /**
     * 字体 CDN 的 preconnect 提示（提前 DNS + TLS 握手，加速首屏字体加载）
     */
    public function resource_hints(array $hints, string $relation): array {
        if ('preconnect' === $relation) {
            $hints[] = [
                'href' => 'https://fonts.googleapis.com',
                'crossorigin',
            ];
            $hints[] = [
                'href' => 'https://fonts.gstatic.com',
                'crossorigin',
            ];
            $hints[] = [
                'href' => 'https://cdn.jsdelivr.net',
                'crossorigin',
            ];
        }
        return $hints;
    }

}

return AKSRT_Scripts::get_instance();