tracking number Woo

function tracking_company_select_options() {
	return array(
		'elta' => 'Ελτά',
		'tnt' => 'TNT',
		'geniki_taxydromiki' => 'Γενική Ταχυδρομική'
	);
}

add_action( 'cmb2_admin_init', 'dcwd_order_metabox' );
function dcwd_order_metabox() {
	$cmb = new_cmb2_box( array(
		'id'            => 'order_tracking_info',
		'title'         => 'Tracking Number',
		'object_types'  => array( 'shop_order', ), // Post type
		'context'       => 'side',
		'priority'      => 'high',
		'show_names'    => true, // Show field names on the left
	) );
	$cmb->add_field( array(
		'name'  => 'Courier',
		'id'    => 'tracking_company',
		'type'  => 'select',
		'options_cb' => 'tracking_company_select_options',
	) );
	$cmb->add_field( array(
		'name'  => 'Tracking number',
		'id'    => 'tracking_number',
		'type'  => 'text',
	) );


}

add_action( 'woocommerce_email_order_details', 'dcwd_add_tracking_info_to_order_completed_email', 5, 4 ); 
function dcwd_add_tracking_info_to_order_completed_email( $order, $sent_to_admin, $plain_text, $email ) {
/*	// Only customers need to know about the tracking information.
	if ( ! $sent_to_admin ) {
		return;
	}
*/
	if ( 'customer_completed_order' == $email->id || 'customer_invoice' == $email->id ) {
		$order_id = $order->get_id();
		$tracking_number = get_post_meta( $order_id, 'tracking_number', true );
		$tracking_company = get_post_meta( $order_id, 'tracking_company', true );

		if ( $tracking_company == 'geniki_taxydromiki' ) {
			$tracking_url = '<a href="https://www.taxydromiki.com/TRACK/' . $tracking_number . '">' . $tracking_number . '</a>';
		} elseif ( $tracking_company == 'tnt' ) {
			$tracking_url = '<a href="https://www.tnt.com/express/en_gr/site/shipping-tools/tracking.html?searchType=con&cons=' . $tracking_number . '">' . $tracking_number . '</a>';
		} else {
			$tracking_url = $tracking_number;
		}

		
		// Quit if either tracking field is empty.
		if ( empty( $tracking_number ) || empty( $tracking_url ) ) {
			// Debugging code.
			//error_log( sprintf( 'Order %d does not have both tracking number (%s) and url (%s)', $order_id, $tracking_number, $tracking_url ) );
			//echo '<p>Sorry, tracking information is not available at this time.</p>';
			return;
		}

		if ( $plain_text ) {
			if ( ! empty( $tracking_number ) ) {
				printf( "\nYour tracking number is %s.\n", $tracking_number );
			}
		}
		else {
			if ( ! empty( $tracking_number ) ) {
				printf( '<p>Your tracking number is %s.</p>', $tracking_url );
			}
		}
	}
}