Order coupons on store pages

add_action( 'init', function() {
    remove_action( 'pre_get_posts', 'wpcoupon_pre_get_store_posts', PHP_INT_MAX );
    add_action( 'pre_get_posts', 'custom_wpcoupon_pre_get_store_posts', PHP_INT_MAX );
} );

function custom_wpcoupon_pre_get_store_posts( $query ) {
    if ( $query->is_tax( 'coupon_store' ) && $query->is_main_query() ) {

        $coupon_type = 'all';
        $available_coupon_type = wpcoupon_get_coupon_types();

        $get_coupon_var = ( isset( $_GET['coupon_type'] ) ) ? sanitize_text_field( wp_unslash( $_GET['coupon_type'] ) ) : '';
        $filtered_sortby = ( isset( $_GET['sort_by'] ) ) ? sanitize_text_field( wp_unslash( $_GET['sort_by'] ) ) : 'newest';
        $filtered_cat = ( isset( $_GET['coupon_cat'] ) ) ? sanitize_text_field( wp_unslash( $_GET['coupon_cat'] ) ) : '';
        $filtered_cat = array_filter( explode( ',', $filtered_cat ) );
        if ( isset( $get_coupon_var ) && array_key_exists( $get_coupon_var, $available_coupon_type ) ) {
            $coupon_type = $get_coupon_var;
        }
        $paged = ( get_query_var( 'paged' ) ) ? get_query_var( 'paged' ) : 1;
        $number_active = intval( wpcoupon_get_option( 'store_number_active', 15 ) );
        $query->set( 'posts_per_page', $number_active );

        $query->set( 'paged', $paged );
        $now = current_time( 'timestamp' );
        $meta_query = array();
        if ( 'all' != $coupon_type ) {
            $meta_query = array(
                'relation' => 'AND',
                array(
                    'key' => '_wpc_coupon_type',
                    'value' => $coupon_type,
                    'compare' => '=',
                ),
            );
        }

        if ( is_array( $filtered_cat ) && ! empty( $filtered_cat ) ) { // phpcs:ignore
            $query->set(
                'tax_query',
                array(
                    'relation' => 'AND',
                    array(
                        'taxonomy' => 'coupon_category',
                        'field'    => 'slug',
                        'terms'    => $filtered_cat,
                        'operator' => 'IN',
                    ),
                )
            );
        }
        switch ( $filtered_sortby ) {
            case 'popularity':
                $query->set( 'meta_key', '_wpc_used' );
                $query->set( 'orderby', 'meta_value_num' );
                $query->set( 'order', 'desc' );
                $query->set( 'meta_type', 'NUMERIC' );
                break;
            case 'ending-soon':
                $query->set( 'meta_key', '_wpc_expires' );
                $query->set( 'meta_value', $now );
                $query->set( 'meta_compare', '>=' );
                $query->set( 'meta_type', 'NUMERIC' );
                $query->set( 'orderby', 'meta_value_num' );
                $query->set( 'order', 'asc' );
                break;
            case 'expired':
                $meta_query[] = array(
                    array(
                        'key' => '_wpc_expires',
                        'compare' => 'EXISTS',
                    ),
                    array(
                        'key' => '_wpc_expires',
                        'type' => 'NUMERIC',
                        'value' => 0,
                        'compare' => '>',
                    ),
                    array(
                        'key' => '_wpc_expires',
                        'value' => $now,
                        'type' => 'NUMERIC',
                        'compare' => '<=',
                    ),
                );
                $query->set( 'meta_key', '_wpc_expires' );
                $query->set( 'orderby', 'meta_value' );
                $query->set( 'meta_type', 'NUMERIC' );
                $query->set( 'order', 'desc' );
                break;
            default:
                $query->set( 'orderby', 'menu_order date' );
                $query->set( 'order', 'desc' );
                break;
        }
        if ( ! empty( $meta_query ) ) {
            $query->set( 'meta_query', $meta_query );
        }
    }
    return $query;
}