WT 1.0.1: change virtual/downloadable type and visiblity

/**
 * Fairly hacky workaround to a number of common WooTickets issues (WT 1.0.1) - allows the catalog visibility and
 * product type (virtual, downloadable) to be set to desired values automatically.
 *
 * This is not an official Modern Tribe solution and may not even work in all cases - but it may be useful for some
 * folks. No guarantees - drop it in your theme's functions.php file and see what happens ;-)
 *
 * @author Barry Hughes http://codingkills.me
 * @license GPLv3 http://www.gnu.org/licenses/gpl-3.0.txt
 * @date 13 June 2013
 */
class Adapt_WooTicket_Type {
    protected $trigger_action = 'wp_ajax_tribe-ticket-add-TribeWooTickets';
    protected $final_action = 'set_object_terms'; // Chosen to shoehorn in the final work before the response is dispatched
    protected $ticket_properties = array();
    protected $ticket_id = 0;


    public function __construct(array $properties = null) {
        if (null !== $properties) $this->ticket_properties = $properties;
        add_action($this->trigger_action, array($this, 'listen_for_ticket_creation'), 5);
        add_action($this->final_action, array($this, 'modify_ticket_on_save'));
    }


    public function listen_for_ticket_creation() {
        add_action('save_post', array($this, 'catch_ticket_id'), 10, 2);
    }


    public function catch_ticket_id($post_id, $post) {
        if ('product' !== $post->post_type) return;
        $this->ticket_id = $post_id;
    }


    public function modify_ticket_on_save() {
        if (0 === $this->ticket_id) return;

        foreach ($this->ticket_properties as $key => $value) {
            if (0 !== strpos($key, '_')) $key = "_$key"; // Auto-prefix with the underscore if needed
            update_post_meta($this->ticket_id, $key, $value);
        }
    }
}

// Set up the desired product properties - comment out or delete items you
// don't need/want and add new ones as required
new Adapt_WooTicket_Type(array(
    'visibility' => 'visible',
    'downloadable' => 'yes',
    'virtual' => 'yes'
));