Snippets for Shipping Rate by Distance plugin

<?php
/*
*
* Every snippet can be used by placing it in your theme's functions.php file
* Everything here is made specifically for https://codecanyon.net/item/shipping-rate-by-distance-for-woocommerce/21671361/comments
*
*/


// Use this snippet in case the totals are not being automatically updated on your cart page.
function fix_cart_calculation()
{

	if (!defined('WOOCOMMERCE_CART')) {
		define('WOOCOMMERCE_CART', true);
	}
	WC()->cart->calculate_totals();
}
add_action('woocommerce_init', 'fix_cart_calculation', 10, 1);


// Change `free shipping` label
function change_wpali_distance_shipping_rate($data)
{
	if (isset($data['label']) && strpos($data['label'], 'Free Shipping') !== false) {
		$data['label'] = str_replace('Free Shipping', 'new label', $data['label']);
	}
	return $data;
}
add_filter('wpali_distance_shipping_rate', 'change_wpali_distance_shipping_rate');

// Set the default country for calculations ( usefull if you have disabled country field )
function wpali_target_single_country($params)
{
	$params['region'] = "uk"; // Change this value to your country code https://developers.google.com/maps/documentation/distance-matrix/overview#region
	return $params;
}
add_filter('wpali_distance_calculating_params', 'wpali_target_single_country');

// Make distance shipping method untaxable (it's taxable by default)
function make_wpali_distance_shipping_rate_taxable($rate)
{
	$rate['taxes'] = false;
	return $rate;
}
add_filter('wpali_distance_shipping_rate', 'make_wpali_distance_shipping_rate_taxable');


// Charge per mile/KM ( now available by default in latest version )
function srbd_price_per_mile_field($field)
{

	$field['srbd_price_per_mile'] = array(
		'title'             => __('Price per Mile/Km', 'shippingdistance'),
		'type'            => 'number',
		'default'         => 0.50,
		'custom_attributes' => array(
			'step' => '0.01',
		),
	);

	return $field;
}
add_filter('woocommerce_settings_api_form_fields_shipping_rate_by_distance', 'srbd_price_per_mile_field', 10, 1);
function srbd_add_price_per_mile_to_rate($rate, $obj)
{

	if (isset($rate['cost'])) {
		$price = $obj->get_option('srbd_price_per_mile', 0.50);
		$meters = $rate['meta_data']['value'];
		if ('km' === $obj->unit) {
			$distance = $meters * 0.001;
		} else {
			$distance = $meters * 0.000621371;
		}

		if ($price > 0) {
			$rate['cost'] = $distance * (float)$price;
		}
	}

	return $rate;
}
add_filter('wpali_distance_shipping_rate', 'srbd_add_price_per_mile_to_rate', 10, 2);

// Charge a base shipping price if distance is below xx KM/mile, and a base price + per KM/mile rate otherwise
add_filter('wpali_distance_shipping_rate', 'wpali_add_base_price_to_rate', 10, 2);
function wpali_add_base_price_to_rate($rate, $obj)
{
	if (!empty($rate['meta_data'])) {
		$meters = $rate['meta_data'];
		$distance_in_km = $meters * 0.001;
		$distance_in_km = round($distance_in_km, 2);
	} else {
		$distance_in_km = null;
	}

	if ($distance_in_km !== null) {
		if ($distance_in_km < 20) {
			$rate['cost'] = 70;
		} else {
			$price_per_km = $rate['cost'] / $distance_in_km;
			$cost_per_first_20km = 70;
			$cost_per_remaining_kms = ($distance_in_km - 20) * $price_per_km;
			$rate['cost'] = $cost_per_first_20km + $cost_per_remaining_kms;
		}
	}

	return $rate;
}

// Exclude products from shipping
add_filter('wpali_distance_shipping_rate', 'wpali_exclude_gift_cards', 10, 2);
function wpali_exclude_gift_cards($rate, $obj)
{
	$cart_have_gift_card = false;
	$non_gift_card_products = 0;
	// The IDs of product you want to exclude from shipping
	$gift_cards_ids = array(1, 2);

	if (!WC()->cart->is_empty()) {
		// Loop though cart items
		foreach (WC()->cart->get_cart() as $cart_item) {
			// Check if the product is a gift card
			if (in_array($cart_item['product_id'], $gift_cards_ids)) {
				$cart_have_gift_card = true;
			} else {
				// Increment non-gift card products count
				$non_gift_card_products++;
			}
		}
	}

	// Apply the condition only if the cart has gift cards and no other products
	if ($cart_have_gift_card && $non_gift_card_products === 0) {
		$rate['cost'] = 0;
		$data['label'] = 'Shipping fee not applicable';
	}

	return $rate;
}