<?php
/**
 * EPPRO_Post_Grid_AJAX
 *
 * Load More / Infinite Scroll for the Post Grid widget.
 *
 * The request only carries the widget ID, the Elementor document that
 * contains it and the page number. The query and the card markup come from
 * the saved widget (EPPRO_Post_Grid_Widget::render_ajax_page()), so appended
 * posts look exactly like the first page and visitors cannot alter the query.
 *
 * @package AdMoreWidgetsSuite
 * @since   1.0.0
 */

if ( ! defined( 'ABSPATH' ) ) exit;

class EPPRO_Post_Grid_AJAX {

    public static function init(): void {
        add_action( 'wp_ajax_eppro_load_more_posts',        [ __CLASS__, 'load_more_posts' ] );
        add_action( 'wp_ajax_nopriv_eppro_load_more_posts', [ __CLASS__, 'load_more_posts' ] );
    }

    public static function load_more_posts(): void {
        if ( ! check_ajax_referer( 'eppro_post_grid', 'nonce', false ) ) {
            wp_send_json_error( [ 'code' => 'invalid_nonce' ], 403 );
        }

        $post_id   = absint( $_POST['post_id'] ?? 0 );
        $widget_id = isset( $_POST['widget_id'] ) ? sanitize_key( wp_unslash( $_POST['widget_id'] ) ) : '';
        $page      = max( 2, absint( $_POST['page'] ?? 2 ) );
        $loaded    = isset( $_POST['loaded'] ) ? array_map( 'absint', explode( ',', sanitize_text_field( wp_unslash( $_POST['loaded'] ) ) ) ) : [];
        $loaded    = array_slice( array_filter( $loaded ), 0, 500 );

        $widget = EPPRO_Elementor_Helper::get_widget( $post_id, $widget_id, 'eppro-post-grid' );
        if ( ! $widget || ! method_exists( $widget, 'render_ajax_page' ) ) {
            wp_send_json_error( [ 'message' => __( 'This post grid could not be found. Please reload the page.', 'admore-widgets-suite' ) ], 400 );
        }

        wp_send_json_success( $widget->render_ajax_page( $page, $loaded ) );
    }
}