762 lines
22 KiB
PHP
762 lines
22 KiB
PHP
<?php
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/**
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* Discount calculation
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*
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* @author Automattic
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* @package WooCommerce/Classes
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* @version 3.2.0
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* @since 3.2.0
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*/
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if ( ! defined( 'ABSPATH' ) ) {
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exit;
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}
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/**
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* Discounts class.
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*
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* @todo this class will need to be called instead get_discounted_price, in the cart?
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*/
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class WC_Discounts {
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/**
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* An array of items to discount.
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*
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* @var array
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*/
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protected $items = array();
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/**
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* An array of discounts which have been applied to items.
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*
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* @var array
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*/
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protected $discounts = array();
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/**
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* An array of applied coupons codes and total discount.
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*
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* @var array
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*/
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protected $applied_coupons = array();
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/**
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* Precision so we can work in cents.
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*
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* @var int
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*/
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protected $precision = 1;
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/**
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* Constructor.
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*
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* @param array $items Items to discount.
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*/
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public function __construct( $items = array() ) {
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$this->precision = pow( 10, wc_get_price_decimals() );
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$this->set_items( $items );
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}
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/**
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* Get items.
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*
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* @since 3.2.0
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* @return object[]
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*/
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public function get_items() {
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return $this->items;
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}
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/**
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* Get discount by key without precision.
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*
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* @since 3.2.0
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* @param string $key name of discount row to return.
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* @return array
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*/
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public function get_discount( $key ) {
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return isset( $this->discounts[ $key ] ) ? $this->remove_precision( $this->discounts[ $key ] ) : 0;
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}
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/**
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* Get all discount totals with precision.
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*
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* @since 3.2.0
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* @param bool $in_cents Should the totals be returned in cents, or without precision.
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* @return array
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*/
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public function get_discounts( $in_cents = false ) {
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return $in_cents ? $this->discounts : array_map( array( $this, 'remove_precision' ), $this->discounts );
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}
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/**
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* Get discounted price of an item without precision.
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*
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* @since 3.2.0
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* @param object $item Get data for this item.
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* @return float
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*/
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public function get_discounted_price( $item ) {
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return $this->remove_precision( $this->get_discounted_price_in_cents( $item ) );
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}
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/**
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* Get discounted price of an item to precision (in cents).
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*
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* @since 3.2.0
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* @param object $item Get data for this item.
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* @return float
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*/
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public function get_discounted_price_in_cents( $item ) {
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return $item->price - $this->discounts[ $item->key ];
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}
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/**
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* Returns a list of applied coupons with name value pairs - name being
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* the coupon code, and value being the total amount disounted.
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*
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* @since 3.2.0
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* @return array
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*/
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public function get_applied_coupons() {
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return array_map( array( $this, 'remove_precision' ), $this->applied_coupons );
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}
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/**
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* Set cart/order items which will be discounted.
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*
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* @since 3.2.0
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* @param array $items List items, normailised, by WC_Totals.
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*/
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public function set_items( $items ) {
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$this->items = array();
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$this->discounts = array();
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$this->applied_coupons = array();
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if ( ! empty( $items ) && is_array( $items ) ) {
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$this->items = $items;
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$this->discounts = array_fill_keys( array_keys( $items ), 0 );
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}
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uasort( $this->items, array( $this, 'sort_by_price' ) );
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}
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/**
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* Apply a discount to all items using a coupon.
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*
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* @since 3.2.0
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* @param WC_Coupon $coupon Coupon object being applied to the items.
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* @return bool|WP_Error True if applied or WP_Error instance in failure.
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*/
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public function apply_coupon( $coupon ) {
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if ( ! is_a( $coupon, 'WC_Coupon' ) ) {
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return false;
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}
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if ( ! isset( $this->applied_coupons[ $coupon->get_code() ] ) ) {
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$this->applied_coupons[ $coupon->get_code() ] = 0;
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}
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$is_coupon_valid = $this->is_coupon_valid( $coupon );
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if ( is_wp_error( $is_coupon_valid ) ) {
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return $is_coupon_valid;
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}
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// @todo how can we support the old woocommerce_coupon_get_discount_amount filter?
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$items_to_apply = $this->get_items_to_apply_coupon( $coupon );
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switch ( $coupon->get_discount_type() ) {
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case 'percent' :
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$this->applied_coupons[ $coupon->get_code() ] += $this->apply_percentage_discount( $items_to_apply, $coupon->get_amount() );
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break;
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case 'fixed_product' :
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$this->applied_coupons[ $coupon->get_code() ] += $this->apply_fixed_product_discount( $items_to_apply, $coupon->get_amount() * $this->precision );
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break;
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case 'fixed_cart' :
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$this->applied_coupons[ $coupon->get_code() ] += $this->apply_fixed_cart_discount( $items_to_apply, $coupon->get_amount() * $this->precision );
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break;
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}
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}
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/**
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* Add precision (deep) to a price.
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*
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* @since 3.2.0
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* @param int|array $value Value to remove precision from.
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* @return float
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*/
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protected function add_precision( $value ) {
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if ( is_array( $value ) ) {
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foreach ( $value as $key => $subvalue ) {
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$value[ $key ] = $this->add_precision( $subvalue );
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}
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} else {
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$value = $value * $this->precision;
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}
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return $value;
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}
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/**
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* Remove precision (deep) from a price.
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*
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* @since 3.2.0
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* @param int|array $value Value to remove precision from.
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* @return float
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*/
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protected function remove_precision( $value ) {
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if ( is_array( $value ) ) {
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foreach ( $value as $key => $subvalue ) {
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$value[ $key ] = $this->remove_precision( $subvalue );
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}
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} else {
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$value = wc_format_decimal( $value / $this->precision, wc_get_price_decimals() );
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}
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return $value;
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}
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/**
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* Sort by price.
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*
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* @since 3.2.0
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* @param array $a First element.
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* @param array $b Second element.
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* @return int
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*/
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protected function sort_by_price( $a, $b ) {
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$price_1 = $a->price * $a->quantity;
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$price_2 = $b->price * $b->quantity;
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if ( $price_1 === $price_2 ) {
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return 0;
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}
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return ( $price_1 < $price_2 ) ? 1 : -1;
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}
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/**
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* Filter out all products which have been fully discounted to 0.
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* Used as array_filter callback.
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*
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* @since 3.2.0
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* @param object $item Get data for this item.
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* @return bool
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*/
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protected function filter_products_with_price( $item ) {
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return $this->get_discounted_price_in_cents( $item ) > 0;
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}
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/**
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* Get items which the coupon should be applied to.
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*
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* @since 3.2.0
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* @param object $coupon Coupon object.
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* @return array
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*/
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protected function get_items_to_apply_coupon( $coupon ) {
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$items_to_apply = array();
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$limit_usage_qty = 0;
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$applied_count = 0;
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if ( null !== $coupon->get_limit_usage_to_x_items() ) {
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$limit_usage_qty = $coupon->get_limit_usage_to_x_items();
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}
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foreach ( $this->items as $item ) {
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if ( 0 === $this->get_discounted_price_in_cents( $item ) ) {
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continue;
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}
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if ( ! $coupon->is_valid_for_product( $item->product, $item->cart_item ) && ! $coupon->is_valid_for_cart() ) {
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continue;
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}
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if ( $limit_usage_qty && $applied_count > $limit_usage_qty ) {
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break;
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}
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if ( $limit_usage_qty && $item->quantity > ( $limit_usage_qty - $applied_count ) ) {
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$limit_to_qty = absint( $limit_usage_qty - $applied_count );
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$item->price = ( $item->price / $item->quantity ) * $limit_to_qty;
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$item->quantity = $limit_to_qty; // Lower the qty so the discount is applied less.
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}
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if ( 0 >= $item->quantity ) {
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continue;
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}
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$items_to_apply[] = $item;
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$applied_count += $item->quantity;
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}
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return $items_to_apply;
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}
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/**
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* Apply a discount amount to an item and ensure it does not go negative.
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*
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* @since 3.2.0
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* @param object $item Get data for this item.
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* @param int $discount Amount of discount.
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* @return int Amount discounted.
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*/
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protected function add_item_discount( &$item, $discount ) {
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$discounted_price = $this->get_discounted_price_in_cents( $item );
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$discount = $discount > $discounted_price ? $discounted_price : $discount;
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$this->discounts[ $item->key ] = $this->discounts[ $item->key ] + $discount;
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return $discount;
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}
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/**
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* Apply percent discount to items.
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*
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* @since 3.2.0
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* @param array $items_to_apply Array of items to apply the coupon to.
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* @param int $amount Amount of discount.
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* @return int total discounted in cents
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*/
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protected function apply_percentage_discount( $items_to_apply, $amount ) {
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$total_discounted = 0;
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foreach ( $items_to_apply as $item ) {
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$total_discounted += $this->add_item_discount( $item, $amount * ( $this->get_discounted_price_in_cents( $item ) / 100 ) );
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}
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return $total_discounted;
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}
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/**
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* Apply fixed product discount to items.
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*
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* @since 3.2.0
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* @param array $items_to_apply Array of items to apply the coupon to.
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* @param int $discount Amount of discout.
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* @return int total discounted in cents
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*/
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protected function apply_fixed_product_discount( $items_to_apply, $discount ) {
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$total_discounted = 0;
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foreach ( $items_to_apply as $item ) {
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$total_discounted += $this->add_item_discount( $item, $discount * $item->quantity );
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}
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return $total_discounted;
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}
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/**
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* Apply fixed cart discount to items.
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*
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* @since 3.2.0
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* @param array $items_to_apply Array of items to apply the coupon to.
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* @param int $cart_discount Fixed discount amount to apply.
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* @return int total discounted in cents
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*/
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protected function apply_fixed_cart_discount( $items_to_apply, $cart_discount ) {
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$items_to_apply = array_filter( $items_to_apply, array( $this, 'filter_products_with_price' ) );
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if ( ! $item_count = array_sum( wp_list_pluck( $items_to_apply, 'quantity' ) ) ) {
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return 0;
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}
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$per_item_discount = floor( $cart_discount / $item_count ); // round it down to the nearest cent number.
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$amount_discounted = 0;
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if ( $per_item_discount > 0 ) {
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foreach ( $items_to_apply as $item ) {
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$amount_discounted += $this->add_item_discount( $item, $per_item_discount * $item->quantity );
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}
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/**
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* If there is still discount remaining, repeat the process.
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*/
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if ( $amount_discounted > 0 && $amount_discounted < $cart_discount ) {
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$amount_discounted += $this->apply_fixed_cart_discount( $items_to_apply, $cart_discount - $amount_discounted );
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}
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} elseif ( $cart_discount > 0 ) {
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/**
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* Deal with remaining fractional discounts by splitting it over items
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* until the amount is expired, discounting 1 cent at a time.
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*/
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foreach ( $items_to_apply as $item ) {
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for ( $i = 0; $i < $item->quantity; $i ++ ) {
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$amount_discounted += $this->add_item_discount( $item, 1 );
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if ( $amount_discounted >= $cart_discount ) {
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break 2;
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}
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}
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if ( $amount_discounted >= $cart_discount ) {
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break;
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}
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}
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}
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return $amount_discounted;
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}
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/*
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|--------------------------------------------------------------------------
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| Validation & Error Handling
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|--------------------------------------------------------------------------
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*/
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/**
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* Ensure coupon exists or throw exception.
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*
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* @since 3.2.0
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* @throws Exception Error message.
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* @param WC_Coupon $coupon Coupon data.
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* @return bool
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*/
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protected function validate_coupon_exists( $coupon ) {
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if ( ! $coupon->get_id() ) {
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/* translators: %s: coupon code */
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throw new Exception( sprintf( __( 'Coupon "%s" does not exist!', 'woocommerce' ), $coupon->get_code() ), 105 );
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}
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return true;
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}
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/**
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* Ensure coupon usage limit is valid or throw exception.
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*
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* @since 3.2.0
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* @throws Exception Error message.
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* @param WC_Coupon $coupon Coupon data.
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* @return bool
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*/
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protected function validate_coupon_usage_limit( $coupon ) {
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if ( $coupon->get_usage_limit() > 0 && $coupon->get_usage_count() >= $coupon->get_usage_limit() ) {
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throw new Exception( __( 'Coupon usage limit has been reached.', 'woocommerce' ), 106 );
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}
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return true;
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}
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/**
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* Ensure coupon user usage limit is valid or throw exception.
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*
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* Per user usage limit - check here if user is logged in (against user IDs).
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* Checked again for emails later on in WC_Cart::check_customer_coupons().
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*
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* @since 3.2.0
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* @throws Exception Error message.
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* @param WC_Coupon $coupon Coupon data.
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* @param int $user_id User ID.
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* @return bool
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*/
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protected function validate_coupon_user_usage_limit( $coupon, $user_id = 0 ) {
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if ( empty( $user_id ) ) {
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$user_id = get_current_user_id();
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}
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if ( $coupon->get_usage_limit_per_user() > 0 && is_user_logged_in() && $coupon->get_id() && $coupon->get_data_store() ) {
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$date_store = $coupon->get_data_store();
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$usage_count = $date_store->get_usage_by_user_id( $coupon, $user_id );
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if ( $usage_count >= $coupon->get_usage_limit_per_user() ) {
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throw new Exception( __( 'Coupon usage limit has been reached.', 'woocommerce' ), 106 );
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}
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}
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return true;
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}
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/**
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* Ensure coupon date is valid or throw exception.
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*
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* @since 3.2.0
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* @throws Exception Error message.
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* @param WC_Coupon $coupon Coupon data.
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* @return bool
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*/
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protected function validate_coupon_expiry_date( $coupon ) {
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if ( $coupon->get_date_expires() && current_time( 'timestamp', true ) > $coupon->get_date_expires()->getTimestamp() ) {
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throw new Exception( __( 'This coupon has expired.', 'woocommerce' ), 107 );
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}
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return true;
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}
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/**
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* Ensure coupon amount is valid or throw exception.
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*
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* @since 3.2.0
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* @throws Exception Error message.
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* @param WC_Coupon $coupon Coupon data.
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* @param float $subtotal Items subtotal.
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* @return bool
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*/
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protected function validate_coupon_minimum_amount( $coupon, $subtotal = 0 ) {
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if ( $coupon->get_minimum_amount() > 0 && apply_filters( 'woocommerce_coupon_validate_minimum_amount', $coupon->get_minimum_amount() > $subtotal, $coupon, $subtotal ) ) {
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/* translators: %s: coupon minimum amount */
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throw new Exception( sprintf( __( 'The minimum spend for this coupon is %s.', 'woocommerce' ), wc_price( $coupon->get_minimum_amount() ) ), 108 );
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}
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return true;
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}
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/**
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* Ensure coupon amount is valid or throw exception.
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*
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* @since 3.2.0
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* @throws Exception Error message.
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* @param WC_Coupon $coupon Coupon data.
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* @param float $subtotal Items subtotal.
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* @return bool
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*/
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protected function validate_coupon_maximum_amount( $coupon, $subtotal = 0 ) {
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if ( $coupon->get_maximum_amount() > 0 && apply_filters( 'woocommerce_coupon_validate_maximum_amount', $coupon->get_maximum_amount() < $subtotal, $coupon ) ) {
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/* translators: %s: coupon maximum amount */
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throw new Exception( sprintf( __( 'The maximum spend for this coupon is %s.', 'woocommerce' ), wc_price( $coupon->get_maximum_amount() ) ), 112 );
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}
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return true;
|
|
}
|
|
|
|
/**
|
|
* Ensure coupon is valid for products in the list is valid or throw exception.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool
|
|
*/
|
|
protected function validate_coupon_product_ids( $coupon ) {
|
|
if ( count( $coupon->get_product_ids() ) > 0 ) {
|
|
$valid = false;
|
|
|
|
foreach ( $this->items as $item ) {
|
|
if ( $item->product && in_array( $item->product->get_id(), $coupon->get_product_ids(), true ) || in_array( $item->product->get_parent_id(), $coupon->get_product_ids(), true ) ) {
|
|
$valid = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( ! $valid ) {
|
|
throw new Exception( __( 'Sorry, this coupon is not applicable to selected products.', 'woocommerce' ), 109 );
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Ensure coupon is valid for product categories in the list is valid or throw exception.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool
|
|
*/
|
|
protected function validate_coupon_product_categories( $coupon ) {
|
|
if ( count( $coupon->get_product_categories() ) > 0 ) {
|
|
$valid = false;
|
|
|
|
foreach ( $this->items as $item ) {
|
|
if ( $coupon->get_exclude_sale_items() && $item->product && $item->product->is_on_sale() ) {
|
|
continue;
|
|
}
|
|
|
|
$product_cats = wc_get_product_cat_ids( $item->product->get_id() );
|
|
|
|
// If we find an item with a cat in our allowed cat list, the coupon is valid.
|
|
if ( count( array_intersect( $product_cats, $coupon->get_product_categories() ) ) > 0 ) {
|
|
$valid = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( ! $valid ) {
|
|
throw new Exception( __( 'Sorry, this coupon is not applicable to selected products.', 'woocommerce' ), 109 );
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Ensure coupon is valid for sale items in the list is valid or throw exception.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool
|
|
*/
|
|
protected function validate_coupon_sale_items( $coupon ) {
|
|
if ( $coupon->get_exclude_sale_items() ) {
|
|
$valid = false;
|
|
|
|
foreach ( $this->items as $item ) {
|
|
if ( $item->product && ! $item->product->is_on_sale() ) {
|
|
$valid = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( ! $valid ) {
|
|
throw new Exception( __( 'Sorry, this coupon is not valid for sale items.', 'woocommerce' ), 110 );
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* All exclusion rules must pass at the same time for a product coupon to be valid.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool
|
|
*/
|
|
protected function validate_coupon_excluded_items( $coupon ) {
|
|
if ( ! $this->items && $coupon->is_type( wc_get_product_coupon_types() ) ) {
|
|
$valid = false;
|
|
|
|
foreach ( $this->items as $item ) {
|
|
if ( $item->product && $coupon->is_valid_for_product( $item->product, $item->cart_item ) ) {
|
|
$valid = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( ! $valid ) {
|
|
throw new Exception( __( 'Sorry, this coupon is not applicable to selected products.', 'woocommerce' ), 109 );
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Cart discounts cannot be added if non-eligible product is found.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool
|
|
*/
|
|
protected function validate_coupon_eligible_items( $coupon ) {
|
|
if ( ! $coupon->is_type( wc_get_product_coupon_types() ) ) {
|
|
$this->validate_coupon_excluded_product_ids( $coupon );
|
|
$this->validate_coupon_excluded_product_categories( $coupon );
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Exclude products.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool
|
|
*/
|
|
protected function validate_coupon_excluded_product_ids( $coupon ) {
|
|
// Exclude Products.
|
|
if ( count( $coupon->get_excluded_product_ids() ) > 0 ) {
|
|
$products = array();
|
|
|
|
foreach ( $this->items as $item ) {
|
|
if ( $item->product && in_array( $item->product->get_id(), $coupon->get_excluded_product_ids(), true ) || in_array( $item->product->get_parent_id(), $coupon->get_excluded_product_ids(), true ) ) {
|
|
$products[] = $item->product->get_name();
|
|
}
|
|
}
|
|
|
|
if ( ! empty( $products ) ) {
|
|
/* translators: %s: products list */
|
|
throw new Exception( sprintf( __( 'Sorry, this coupon is not applicable to the products: %s.', 'woocommerce' ), implode( ', ', $products ) ), 113 );
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Exclude categories from product list.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool
|
|
*/
|
|
protected function validate_coupon_excluded_product_categories( $coupon ) {
|
|
if ( count( $coupon->get_excluded_product_categories() ) > 0 ) {
|
|
$categories = array();
|
|
|
|
foreach ( $this->items as $item ) {
|
|
if ( $coupon->get_exclude_sale_items() && $item->product && $item->product->is_on_sale() ) {
|
|
continue;
|
|
}
|
|
|
|
$product_cats = wc_get_product_cat_ids( $item->product->get_id() );
|
|
$cat_id_list = array_intersect( $product_cats, $coupon->get_excluded_product_categories() );
|
|
if ( count( $cat_id_list ) > 0 ) {
|
|
foreach ( $cat_id_list as $cat_id ) {
|
|
$cat = get_term( $cat_id, 'product_cat' );
|
|
$categories[] = $cat->name;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( ! empty( $categories ) ) {
|
|
/* translators: %s: categories list */
|
|
throw new Exception( sprintf( __( 'Sorry, this coupon is not applicable to the categories: %s.', 'woocommerce' ), implode( ', ', array_unique( $categories ) ) ), 114 );
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Check if a coupon is valid.
|
|
*
|
|
* Error Codes:
|
|
* - 100: Invalid filtered.
|
|
* - 101: Invalid removed.
|
|
* - 102: Not yours removed.
|
|
* - 103: Already applied.
|
|
* - 104: Individual use only.
|
|
* - 105: Not exists.
|
|
* - 106: Usage limit reached.
|
|
* - 107: Expired.
|
|
* - 108: Minimum spend limit not met.
|
|
* - 109: Not applicable.
|
|
* - 110: Not valid for sale items.
|
|
* - 111: Missing coupon code.
|
|
* - 112: Maximum spend limit met.
|
|
* - 113: Excluded products.
|
|
* - 114: Excluded categories.
|
|
*
|
|
* @since 3.2.0
|
|
* @throws Exception Error message.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
* @return bool|WP_Error
|
|
*/
|
|
public function is_coupon_valid( $coupon ) {
|
|
try {
|
|
$this->validate_coupon_exists( $coupon );
|
|
$this->validate_coupon_usage_limit( $coupon );
|
|
$this->validate_coupon_user_usage_limit( $coupon );
|
|
$this->validate_coupon_expiry_date( $coupon );
|
|
$this->validate_coupon_minimum_amount( $coupon );
|
|
$this->validate_coupon_maximum_amount( $coupon );
|
|
$this->validate_coupon_product_ids( $coupon );
|
|
$this->validate_coupon_product_categories( $coupon );
|
|
$this->validate_coupon_sale_items( $coupon );
|
|
$this->validate_coupon_excluded_items( $coupon );
|
|
$this->validate_coupon_eligible_items( $coupon );
|
|
|
|
if ( ! apply_filters( 'woocommerce_discount_is_coupon_valid', true, $coupon, $this ) ) {
|
|
throw new Exception( __( 'Coupon is not valid.', 'woocommerce' ), 100 );
|
|
}
|
|
} catch ( Exception $e ) {
|
|
/**
|
|
* Filter the coupon error message.
|
|
*
|
|
* @param string $error_message Error message.
|
|
* @param int $error_code Error code.
|
|
* @param WC_Coupon $coupon Coupon data.
|
|
*/
|
|
$message = apply_filters( 'woocommerce_coupon_error', $e->getMessage(), $e->getCode(), $coupon );
|
|
|
|
return new WP_Error( 'invalid_coupon', $message, array(
|
|
'status' => 400,
|
|
) );
|
|
}
|
|
return true;
|
|
}
|
|
}
|