TI Wishlist plugin add random products to users wishlists

ti_populate_wishlist.php

<?php
//https://example.com/?add_to_wishlist_user=1&add_to_wishlist_product=5503
//https://example.com/?add_to_wishlist_user=1&add_random=5

function add_product_to_wishlist( $user_id, $product_id ) {
    global $wpdb;

    // 1. Get or create default wishlist for user
    $wishlist = $wpdb->get_var( $wpdb->prepare(
        "SELECT ID FROM {$wpdb->prefix}tinvwl_lists 
         WHERE author = %d AND type = 'default' LIMIT 1",
        $user_id
    ));

    if ( ! $wishlist ) {
        $wpdb->insert(
            "{$wpdb->prefix}tinvwl_lists",
            array(
                'author' => $user_id,
                'title'  => 'Wishlist',
                'type'   => 'default',
                'status' => 'private',
                'date'   => current_time( 'mysql' ),
            ),
            array( '%d', '%s', '%s', '%s', '%s' )
        );
        $wishlist = $wpdb->insert_id;
    }

    // 2. Prevent duplicates
    $exists = $wpdb->get_var( $wpdb->prepare(
        "SELECT ID FROM {$wpdb->prefix}tinvwl_items 
         WHERE wishlist_id = %d AND product_id = %d LIMIT 1",
        $wishlist, $product_id
    ));

    if ( ! $exists ) {
        $product = wc_get_product( $product_id );
        $price   = $product ? $product->get_price() : 0;
        $in_stock = $product && $product->is_in_stock() ? 1 : 0;

        // Insert item
        $wpdb->insert(
            "{$wpdb->prefix}tinvwl_items",
            array(
                'wishlist_id' => $wishlist,
                'product_id'  => $product_id,
                'variation_id'=> 0,
                'formdata'    => '{"tinvwl-hidden-fields":"[\"quantity\"]"}',
                'author'      => $user_id,
                'date'        => current_time( 'mysql' ),
                'quantity'    => 1,
                'price'       => $price,
                'in_stock'    => $in_stock,
            ),
            array( '%d','%d','%d','%s','%d','%s','%d','%f','%d' )
        );

        // Optional analytics
        $wpdb->query( $wpdb->prepare(
            "INSERT INTO {$wpdb->prefix}tinvwl_analytics 
             (wishlist_id, product_id, variation_id, ID, cart) 
             VALUES (%d, %d, 0, %s, 1)
             ON DUPLICATE KEY UPDATE cart = cart+1",
            $wishlist, $product_id, md5( uniqid( rand(), true ) )
        ));
    }

    return $wishlist;
}


// 🔥 Hook into init and listen for query string
add_action( 'init', function() {
    if ( isset($_GET['add_to_wishlist_user']) ) {
        $user_id = absint( $_GET['add_to_wishlist_user'] );

        // Case 1: specific IDs provided
        if ( isset($_GET['add_to_wishlist_products']) ) {
            $ids = explode( ',', sanitize_text_field( $_GET['add_to_wishlist_products'] ) );
            foreach ( $ids as $pid ) {
                $pid = absint( $pid );
                if ( $pid ) {
                    add_product_to_wishlist( $user_id, $pid );
                }
            }
        }

        // Case 2: random products requested
        if ( isset($_GET['add_random']) ) {
            $count = absint( $_GET['add_random'] );
            if ( $count > 0 ) {
                // Grab random products from WooCommerce catalog
                $random_products = wc_get_products( array(
                    'limit'   => $count,
                    'orderby' => 'rand',
                    'status'  => 'publish',
                ) );

                foreach ( $random_products as $product ) {
                    add_product_to_wishlist( $user_id, $product->get_id() );
                }
            }
        }

        // Optional: redirect after done
        wp_redirect( site_url( '/wishlist/' ) );
        exit;
    }
});