shortcode options by ID woocommerce

in functions.php

<?php
function ShowCartOptionsById($atts){
    extract( shortcode_atts(
		array(
			'id' => 1,
		), $atts )
	);
    if ( $id && is_numeric($id) ) {
    ob_start();
    //woocommerce check
    if (  in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) { ?>
    <div class="preview-block">
        <?php
        global $product;
        $num = 0;
        $merch = new WP_Query( array(
        'p' => $id,
        'post_type' => array( 'product' )
        ) );

        if( $merch->have_posts() ) : while( $merch->have_posts() ) : $merch->the_post();
        $product = get_product(); ?>
                <?php
                if($product->product_type == "variable"){
                //    echo '<div class="product-type-variable">';
                        woocommerce_variable_add_to_cart();
                 //   echo '</div>';
                } else {
                    woocommerce_quantity_input();
                    woocommerce_template_loop_add_to_cart();
                } ?>
            <?php endwhile; ?>
            <?php endif; wp_reset_postdata(); ?>
	</div><!--preview-block-->
		<?php } } //woocommerce check?>
<?php return ob_get_clean(); }

add_shortcode( 'GetProductOptionsById', 'ShowCartOptionsById' );
if (!is_ssl()) {
 $_SERVER['HTTPS'] = false;
}
?>