Cart: Exclude reward from specific categories #102355178

ignore products from specific categories

<?php
/**
 * FunnelKit Cart Rewards — ignore products from specific categories.
 *
 * Behaviour:
 *  - Products in the excluded categories are IGNORED when calculating Cart Rewards
 *    (their value does not count toward reward progress).
 *  - Products in the included categories always count, regardless of the order
 *    they were added to the cart.
 *  - The Cart Rewards progress bar stays visible even when excluded-category
 *    products are in the cart.
 *
 * How it works: instead of disabling rewards outright (old approach with
 * `fkcart_reward_enabled`, which hid the bar), we subtract the excluded-category
 * items from the total FunnelKit uses to measure reward progress
 * (`fkcart_reward_total`). This single filter drives both the progress bar and the
 * actual reward application (free shipping / coupons / free gifts).
 */

defined( 'ABSPATH' ) || exit;

/**
 * Category term IDs to exclude from Cart Rewards.
 * Add more comma separated, e.g. [ 31, 45 ]. Subcategories of these are also excluded.
 */
if ( ! function_exists( 'fkcart_reward_excluded_categories' ) ) {
	function fkcart_reward_excluded_categories() {
		return apply_filters( 'fkcart_reward_excluded_categories', [ 31 ] ); 
	}
}

/**
 * Is this cart item in one of the excluded categories (or a subcategory of one)?
 *
 * @param array $cart_item
 *
 * @return bool
 */
if ( ! function_exists( 'fkcart_reward_item_is_excluded' ) ) {
	function fkcart_reward_item_is_excluded( $cart_item ) {
		$excluded = fkcart_reward_excluded_categories();
		if ( empty( $excluded ) ) {
			return false;
		}

		$product_id = ! empty( $cart_item['product_id'] ) ? $cart_item['product_id'] : 0;
		$product    = $product_id ? wc_get_product( $product_id ) : false;
		if ( ! $product ) {
			return false;
		}

		$cat_ids = $product->get_category_ids();
		foreach ( $cat_ids as $cat_id ) {
			if ( in_array( $cat_id, $excluded, false ) ) {
				return true;
			}
			// Also treat a product placed in a subcategory of an excluded category as excluded.
			$ancestors = get_ancestors( $cat_id, 'product_cat' );
			if ( array_intersect( $ancestors, $excluded ) ) {
				return true;
			}
		}

		return false;
	}
}

/**
 * Subtract excluded-category items from the total FunnelKit measures rewards against.
 * Keeps the tax basis consistent with how FunnelKit built the total.
 */
add_filter( 'fkcart_reward_total', function ( $total, $calculation_mode, $front ) { // phpcs:ignore
	if ( is_null( WC()->cart ) ) {
		return $total;
	}

	$include_tax = WC()->cart->display_prices_including_tax();
	$deduct      = 0.0;

	foreach ( WC()->cart->get_cart() as $cart_item ) {
		if ( ! fkcart_reward_item_is_excluded( $cart_item ) ) {
			continue;
		}

		if ( 'total' === $calculation_mode ) {
			// Total mode uses line totals (after line discounts).
			$deduct += (float) ( $cart_item['line_total'] ?? 0 );
			if ( $include_tax ) {
				$deduct += (float) ( $cart_item['line_tax'] ?? 0 );
			}
		} else {
			// Subtotal mode uses line subtotals (before cart discounts).
			$deduct += (float) ( $cart_item['line_subtotal'] ?? 0 );
			if ( $include_tax ) {
				$deduct += (float) ( $cart_item['line_subtotal_tax'] ?? 0 );
			}
		}
	}

	$adjusted = (float) $total - $deduct;

	return max( 0, $adjusted );
}, 10, 3 );