// =========================================================================
// AIFOD x ZAAN SYSTEM LOGIC CORE: CPT ENGINE, SANITIZATION & GOOGLE SHEET SYNC
// =========================================================================

// 1. Structural Layer: Register Backup Database Custom Post Type
add_action('init', 'instantiate_summit_backup_cpt');
function instantiate_summit_backup_cpt() {
    register_post_type('summit_registration', array(
        'labels' => array(
            'name'           => 'Summit Registrations',
            'singular_name'  => 'Registration Entry',
        ),
        'public'          => false,
        'show_ui'         => true, // Exposes management records UI component within wp-admin
        'capability_type' => 'post',
        'capabilities'    => array('create_posts' => false), // Guard rails block manual layout inputs
        'map_meta_cap'    => true,
        'supports'        => array('title'), 
        'menu_icon'       => 'dashicons-clipboard',
    ));
}

// 2. Network Endpoint Processing Layer: Secure Webhook Handler
add_action('wp_ajax_execute_summit_registration_pipeline', 'process_summit_registration_payload');
add_action('wp_ajax_nopriv_execute_summit_registration_pipeline', 'process_summit_registration_payload');

function process_summit_registration_payload() {
    // Cryptographic token authorization check
    if ( ! isset($_POST['summit_secure_nonce']) || ! wp_verify_nonce($_POST['summit_secure_nonce'], 'summit_security_token_action') ) {
        wp_send_json_error('CSRF Token processing check failed. Session unsafe.');
    }

    // Explicit server-side structural data normalization & cleansing sanitization
    $name     = sanitize_text_field($_POST['full_name']);
    $email    = sanitize_email($_POST['email']);
    $phone    = sanitize_text_field($_POST['phone']);
    $org      = sanitize_text_field($_POST['organization']);
    $job      = sanitize_text_field($_POST['job_title']);
    $requests = sanitize_textarea_field($_POST['special_requests']);

    // Explicit architectural logic validation check
    if ( empty($name) || empty($email) || ! is_email($email) ) {
        wp_send_json_error('Server-side processing error: Mandatory parameter values validation failed.');
    }

    // STEP A: Store a backup record locally inside MySQL database via our Custom Post Type
    $local_record_id = wp_insert_post(array(
        'post_title'  => $name . ' [' . $email . ']',
        'post_type'   => 'summit_registration',
        'post_status' => 'publish'
    ));

    if ( $local_record_id ) {
        update_post_meta($local_record_id, '_meta_attendee_email', $email);
        update_post_meta($local_record_id, '_meta_attendee_phone', $phone);
        update_post_meta($local_record_id, '_meta_attendee_org', $org);
        update_post_meta($local_record_id, '_meta_attendee_job', $job);
        update_post_meta($local_record_id, '_meta_attendee_requests', $requests);
    }

    // STEP B: Execute out-of-band asynchronous processing pipe straight to Google Sheet API App Script Webhook
    // !! REPLACE THIS WITH YOUR APPS SCRIPT WEB APP DEPLOYMENT URL DURING TRIAL RUN !!
    $google_sheets_target_url = 'https://script.google.com/macros/s/YOUR_DEPLOID_ID_GOES_HERE/exec';

    $data_payload = array(
        'date'             => current_time('Y-m-d H:i:s'),
        'full_name'        => $name,
        'email'            => $email,
        'phone'            => $phone,
        'organization'     => $org,
        'job_title'        => $job,
        'special_requests' => $requests
    );

    $api_network_response = wp_remote_post($google_sheets_target_url, array(
        'method'    => 'POST',
        'timeout'   => 15,
        'body'      => json_encode($data_payload),
        'headers'   => array('Content-Type' => 'application/json')
    ));

    // Handle Network Droppers Gracefully. Since it's saved in the CPT Database Backup, it's NOT a total loss!
    if ( is_wp_error($api_network_response) ) {
        wp_send_json_success('🎉 Registration captured securely on localized system storage grid! (Google Sync delayed).');
    }

    // Success response
    wp_send_json_success('🎉 Registration processed! Data verified and synced over to Google Sheets.');
}