Add a new condition to the Table Rate method that checks quantity of specific shipping class

betrs-add-class-qty-condition.php

/**
 * Add ability to check for quantity 3 of a specific shipping class in Table Rate method
 * Intended for Use with Per Order setups and Method Conditions
 * https://codecanyon.net/item/table-rate-shipping-for-woocommerce/3796656?ref=bolderelements
 *
 * Code should be added to a child theme's functions.php file
 */
function betrs_add_class_qty_cond( $conditions ) {
    // add new option to list
    $conditions['qty_shipping_class'] = '3 of Shipping Class';
    
    return $conditions;
}
add_filter( 'betrs_shipping_cost_conditionals', 'betrs_add_class_qty_cond', 10, 1 );

function betrs_add_class_qty_cond_secondary( $type, $item, $option_ID, $row_ID ) {
    // exit if the custom condition is not a stock status
    if( sanitize_title( $type ) != 'qty_shipping_class' ) return $return;

    // setup table rate form fields
    $option_ID = (int) $option_ID;
    $row_ID = (int) $row_ID;
    $op_name_secondary = "cond_secondary[" . $option_ID . "][" . $row_ID . "][]";
    $op_name_tertiary = "cond_tertiary[" . $option_ID . "][" . $row_ID . "][]";
    $cond_secondary = ( isset( $item['cond_secondary'] ) ) ? sanitize_text_field( $item['cond_secondary'] ) : '';

    $terms = WC()->shipping->get_shipping_classes();
?>
<select name="<?php echo $op_name_secondary; ?>" class="cond_secondary">
                <?php 
                    foreach( $terms as $term ) : 
                        if( isset( $term->term_id ) ) :
                ?>
    <option value="<?php echo $term->term_id; ?>" <?php selected( $term->term_id, $cond_secondary, true ); ?>><?php echo $term->name; ?></option>
                <?php
                        endif;
                    endforeach;
                ?>
    <option value="0" <?php selected( 0, $cond_secondary, true ); ?>>No Class Selected</option>
</select>
<input type="hidden" name="<?php echo $op_name_tertiary; ?>[]" size="8" />
<?php
}
add_action( 'betrs_shipping_cost_conditionals_after', 'betrs_add_class_qty_cond_secondary', 10, 4 );

function betrs_add_class_qty_calc( $data, $items ) {
    $class_counts = array();
    
    // count all shipping classes in cart
    foreach( $items as $key => $values ) {
        $class_id = (int) $values[ 'data' ]->get_shipping_class_id();
        if( ! isset( $class_counts[ $class_id ] ) ) {
            $class_counts[ $class_id ] = $values['quantity'];
        } else {
            $class_counts[ $class_id ] += $values['quantity'];
        }
    }

    // remove duplicated
    $data['qty_shipping_class'] = $class_counts;

    return $data;
}
add_filter( 'betrs_calculated_totals-per_order', 'betrs_add_class_qty_calc', 10, 2 );

function betrs_determine_condition_qty_calc( $return, $cond, $cart_data ) {
    // exit if the custom condition is not a class quantity
    if( sanitize_title( $cond['cond_type'] ) != 'qty_shipping_class' ) return $return;

    // get class variables for comparison
    $cart_classes = (array) $cart_data['qty_shipping_class'];
    $cond_class = intval( $cond['cond_secondary'] );

    // determine if the quantity of 3 is met
    if( isset( $cart_classes[ $cond_class ] ) ) {
        if( intval( $cart_classes[ $cond_class ] ) > 2 ) {
            return true;
        }
    }

    // return false if the condition is not met
    return $return;

}
add_filter( 'betrs_determine_condition_result', 'betrs_determine_condition_qty_calc', 10, 3 );