Electro - Catalog mode show variation in single product page

functions.php

function electro_template_single_add_to_cart() {
	global $product;

	$product_type = electro_wc_get_product_type( $product );
	if( electro_get_shop_catalog_mode() == false ) {
		do_action( 'woocommerce_' . $product_type . '_add_to_cart'  );
	} elseif( electro_get_shop_catalog_mode() == true && $product->is_type( 'external' ) ) {
		do_action( 'woocommerce_' . $product_type . '_add_to_cart'  );
	} elseif( electro_get_shop_catalog_mode() == true && $product->is_type( 'variable' ) ) {
		remove_action( 'woocommerce_single_variation', 'woocommerce_single_variation_add_to_cart_button', 20 );
		do_action( 'woocommerce_' . $product_type . '_add_to_cart'  );
	}
}