Add WooCommerce product programmatically

function.php

<?php
// Product Title
$post_title = 'Test Product';

// Add Product
$new_post = array(
    'post_title' => $post_title,
    'post_type' => 'product',
    'post_status' = > 'draft', 
    'post_content' => 'Lorem Ipsum is simply dummy text of the printing and typesetting industry.',
    'post_excerpt' => 'Lorem Ipsum is simply dummy text'
);

// Catch post ID
$post_id = post_exists( $post_title ) or wp_insert_post( $new_post );

// Add/Update Product meta
// set product is simple/variable/grouped
wp_set_object_terms( $post_id, 'term name here', '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', '11' );
update_post_meta( $post_id, '_length', '11' );
update_post_meta( $post_id, '_width', '11' );
update_post_meta( $post_id, '_height', '11' );
update_post_meta( $post_id, '_sku', 'SKU11' );
update_post_meta( $post_id, '_product_attributes', array() );
update_post_meta( $post_id, '_sale_price_dates_from', '' );
update_post_meta( $post_id, '_sale_price_dates_to', '' );
update_post_meta( $post_id, '_price', '11' );
update_post_meta( $post_id, '_sold_individually', '' );
update_post_meta( $post_id, '_manage_stock', 'yes' );
wc_update_product_stock($post_id, $single['qty'], 'set');
update_post_meta( $post_id, '_backorders', 'no' );
// update_post_meta( $post_id, '_stock', $single['qty'] );


/**
 * Attach images to product (feature/ gallery)
 */
function attach_product_thumbnail($post_id, $url, $flag){

    /*
     * If allow_url_fopen is enable in php.ini then use this
     */
    $image_url = $url;
    $url_array = explode('/',$url);
    $image_name = $url_array[count($url_array)-1];
    $image_data = file_get_contents($image_url); // Get image data

  /*
   * If allow_url_fopen is not enable in php.ini then use this
   */


  // $image_url = $url;
  // $url_array = explode('/',$url);
  // $image_name = $url_array[count($url_array)-1];

  // $ch = curl_init();
  // curl_setopt ($ch, CURLOPT_URL, $image_url);

  // // Getting binary data
  // curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  // curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);

  // $image_data = curl_exec($ch);
  // curl_close($ch);


  $upload_dir = wp_upload_dir(); // Set upload folder
    $unique_file_name = wp_unique_filename( $upload_dir['path'], $image_name ); //    Generate unique name
    $filename = basename( $unique_file_name ); // Create image file name

    // Check folder permission and define file location
    if( wp_mkdir_p( $upload_dir['path'] ) ) {
        $file = $upload_dir['path'] . '/' . $filename;
    } else {
        $file = $upload_dir['basedir'] . '/' . $filename;
    }

    // Create the image file on the server
    file_put_contents( $file, $image_data );

    // Check image file type
    $wp_filetype = wp_check_filetype( $filename, null );

    // Set attachment data
    $attachment = array(
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => sanitize_file_name( $filename ),
        'post_content' => '',
        'post_status' => 'inherit'
    );

    // Create the attachment
    $attach_id = wp_insert_attachment( $attachment, $file, $post_id );

    // Include image.php
    require_once(ABSPATH . 'wp-admin/includes/image.php');

    // Define attachment metadata
    $attach_data = wp_generate_attachment_metadata( $attach_id, $file );

    // Assign metadata to attachment
    wp_update_attachment_metadata( $attach_id, $attach_data );

    // asign to feature image
    if( $flag == 0){
        // And finally assign featured image to post
        set_post_thumbnail( $post_id, $attach_id );
    }

    // assign to the product gallery
    if( $flag == 1 ){
        // Add gallery image to product
        $attach_id_array = get_post_meta($post_id,'_product_image_gallery', true);
        $attach_id_array .= ','.$attach_id;
        update_post_meta($post_id,'_product_image_gallery',$attach_id_array);
    }

}

//set product feature image
attach_product_thumbnail($post_id, $single['coverImage'], 0);
foreach($single['screenshots'] as $screenshots){
  //set gallery image
  attach_product_thumbnail($post_id, $screenshots['url_original'], 1);
}

// Add Product Category
foreach($single['genres'] as $prod_cat){
    if(!term_exists($prod_cat, 'product_cat')){
        $term = wp_insert_term($prod_cat, 'product_cat');
        array_push($tag, $term['term_id']);
    } else {
        $term_s = get_term_by( 'name', $prod_cat, 'product_cat' );
        array_push($tag , $term_s->term_id);
    }
}