Insert and set attributes product woocommerce

addProduct.php

<?php
/**
 * Plugin Name: Insert Products
 * Plugin URI: 
 * Description: 
 * Version: 1.04
 * Author: Agus Prasetiyo
 * Author URI: 
 * License: GPL2
 * Created On: 
 * Updated On: 
 */

//call addaprdct function when plugin is activated by admin:
register_activation_hook( __FILE__, 'addaprdct' );

function addaprdct(){
    $post_id = wp_insert_post( array(
        'post_title'   => "Product baru gan 2",
        'post_content' => "product post content goes here...",
        'post_status'  => "publish",
        'post_excerpt' => "product excerpt content...",
        'post_name'    => "test_prod_gan2", //name/slug
        'post_type'    => "product"
    ) );
    wp_set_object_terms( $post_id, 'simple', 'product_type' );
    update_post_meta( $post_id, '_visibility', 'visible' );
    update_post_meta( $post_id, '_stock_status', 'instock');
    update_post_meta( $post_id, 'total_sales', '0' );
    update_post_meta( $post_id, '_downloadable', 'no' );
    update_post_meta( $post_id, '_virtual', 'yes' );
    update_post_meta( $post_id, '_regular_price', '' );
    update_post_meta( $post_id, '_sale_price', '' );
    update_post_meta( $post_id, '_purchase_note', '' );
    update_post_meta( $post_id, '_featured', 'no' );
    update_post_meta( $post_id, '_weight', '' );
    update_post_meta( $post_id, '_length', '' );
    update_post_meta( $post_id, '_width', '' );
    update_post_meta( $post_id, '_height', '' );
    update_post_meta( $post_id, '_sku', '' );
    update_post_meta( $post_id, '_sale_price_dates_from', '' );
    update_post_meta( $post_id, '_sale_price_dates_to', '' );
    update_post_meta( $post_id, '_price', '' );
    update_post_meta( $post_id, '_sold_individually', '' );
    update_post_meta( $post_id, '_manage_stock', 'no' );
    update_post_meta( $post_id, '_backorders', 'no' );
    update_post_meta( $post_id, '_stock', '' );
    
    // After inserting post
    $my_product_attributes = array('hdd_size' => '500', 'ram_size' => '4');
    wcproduct_set_attributes($post_id, $my_product_attributes);

}

function wcproduct_set_attributes($post_id, $attributes) {
    $i = 0;
    // Loop through the attributes array
    foreach ($attributes as $name => $value) {
        $product_attributes[$i] = array (
            'name' => htmlspecialchars( stripslashes( $name ) ), // set attribute name
            'value' => $value, // set attribute value
            'position' => 1,
            'is_visible' => 1,
            'is_variation' => 1,
            'is_taxonomy' => 0
        );

        $i++;
    }

    // Now update the post with its new attributes
    update_post_meta($post_id, '_product_attributes', $product_attributes);
}
?>