<?php
defined( 'ABSPATH' ) || exit;

/**
 * Adds an "♿ Scan Page" node to the WordPress admin bar on frontend pages.
 * Injects the overlay script into wp_footer for logged-in admins only.
 */
class AccessMate_Admin_Bar {

    public static function register(): void {
        add_action( 'admin_bar_menu',    [ self::class, 'add_node' ], 999 );
        add_action( 'wp_footer',         [ self::class, 'inject_overlay' ] );
        add_action( 'wp_enqueue_scripts', [ self::class, 'enqueue_adminbar_style' ] );
    }

    /**
     * Adds the "Scan Page" node to the WP admin bar.
     * Only visible on frontend pages for users who can manage options.
     */
    public static function add_node( WP_Admin_Bar $bar ): void {
        if ( ! current_user_can( 'manage_options' ) ) return;
        if ( is_admin() ) return;

        $bar->add_node( [
            'id'    => 'accessmate-scan',
            /* translators: Admin bar button label. */
            'title' => '&#9855; ' . esc_html__( 'Scan Page', 'accessmate' ),
            'href'  => '#',
            'meta'  => [
                'class' => 'accessmate-adminbar-btn',
                /* translators: Admin bar button tooltip. */
                'title' => esc_attr__( 'Run accessmate.ai accessibility scan on this page', 'accessmate' ),
            ],
        ] );
    }

    /**
     * Injects a small inline style for the admin bar node (frontend only).
     */
    public static function enqueue_adminbar_style(): void {
        if ( ! current_user_can( 'manage_options' ) ) return;
        if ( ! is_admin_bar_showing() )               return;

        $css = '#wp-admin-bar-accessmate-scan > .ab-item { cursor: pointer; }
#wp-admin-bar-accessmate-scan > .ab-item:hover { color: #3858e9 !important; }';

        wp_add_inline_style( 'admin-bar', $css );
    }

    /**
     * Outputs the overlay config object and loads overlay.js via wp_footer.
     * Only on frontend pages, only for admins, only when the bundle exists.
     */
    public static function inject_overlay(): void {
        if ( ! current_user_can( 'manage_options' ) ) return;
        if ( is_admin() )                             return;
        if ( ! file_exists( ACCESSMATE_PATH . 'assets/overlay.js' ) ) return;

        // Build the current page URL, stripping the ?aai_scan param used for iframe mode.
        // trailingslashit() ensures the URL matches get_permalink() output (which always includes
        // a trailing slash for pretty-permalink pages/posts).
        global $wp;
        $page_url = trailingslashit(
            remove_query_arg( 'aai_scan', home_url( add_query_arg( [], $wp->request ) ) )
        );

        $config = [
            'nonce'    => wp_create_nonce( 'wp_rest' ),
            'restBase' => rest_url( 'accessmate/v1' ),
            'pageUrl'  => esc_url_raw( $page_url ),
        ];
        wp_register_script( 'accessmate-overlay', ACCESSMATE_URL . 'assets/overlay.js', [], ACCESSMATE_VERSION, true );
        wp_add_inline_script( 'accessmate-overlay', 'window.accessmateOverlayConfig=' . wp_json_encode( $config ) . ';', 'before' );
        wp_enqueue_script( 'accessmate-overlay' );
    }
}