/**
 * Posts orderby filter.  The filter will be added using pre_get_posts outside the class
 *  using the pre_get_posts action allows us to do checks for what page etc...
 * @return string, new MySQL ORDER BY clause
 */
function mouldings_order_by() {
    global $wpdb;
    return $wpdb->prepare( "$wpdb->postmeta.meta_value+0 DESC, post_title DESC" );
}

function mouldings_sort($query) {
    if ($query->is_main_query() && is_tax(array('wood_types','profile_categories','combination_categories'))) {
        global $mouldings_options;

        $number_columns = $mouldings_options['profile_item_columns'];
        $posts_per_page = mouldings_word_to_int($number_columns) * apply_filters('mouldings_row_size', 3);

        // run through each taxonomy possibility and set the $taxonomy and $terms variable to the appropriate values
        if (is_tax('wood_types')) {
            $taxonomy = 'wood_types';
            $terms = $query->query_vars['wood_types'];
        }
        elseif (is_tax('profile_categories')) {
            $taxonomy = 'profile_categories';
            $terms = $query->query_vars['profile_categories'];
        }
        elseif (is_tax('combination_categories')) {
            $taxonomy = 'combination_categories';
            $terms = $query->query_vars['combination_categories'];
        }

        $tax_query = array(
            array(
                'taxonomy' => $taxonomy,
                'field' => 'slug',
                'terms' => $terms,
                'include_children' => false
            )
        );

        //print_r($query->query_vars);

        if (is_tax('wood_types')) {
            $query->set('post_type',array('moulding_profiles','moulding_combination'));
        }

        $query->set('posts_per_page', $posts_per_page);
        $query->set('tax_query', $tax_query);
        $query->set('meta_key', '_mouldings_dimensions_height');
        $query->set('order', 'DESC');
        //$query->set('orderby','meta_value_num');
        //
        /** remove_filter() is used to prevent this affecting additional queries on the page */
        remove_filter( current_filter(), __FUNCTION__ );

        add_filter('posts_orderby','mouldings_order_by');

    }
    if ((isset($_GET['sort']) && isset($_GET['order']) && $query->is_main_query() && is_tax(array('wood_types','profile_categories','combination_categories')))
        || (isset($_GET['sort']) && isset($_GET['order']) && is_tax(array('wood_types','profile_categories','combination_categories')) && isset($query->query_vars['post_type']) && ($query->query_vars['post_type'] == 'moulding_profiles' || $query->query_vars['post_type'] == 'moulding_combination'))) {
        $query->set('meta_key', urldecode($_GET['sort']));
        $query->set('sort', urldecode($_GET['sort']));
        $query->set('order', urldecode($_GET['order']));
    }

}
add_action('pre_get_posts','mouldings_sort');