524 lines
15 KiB
PHP
524 lines
15 KiB
PHP
<?php
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/**
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* Order/cart totals calculation class.
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*
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* Methods are private and class is final to keep this as an internal API.
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* May be opened in the future once structure is stable.
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*
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* @author Automattic
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* @package WooCommerce/Classes
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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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* WC_Totals class.
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*
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* @todo consider extending this for cart vs orders if lots of conditonal logic is needed.
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* @todo Instead of setting cart totals from here, do it from a subclass.
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* @todo woocommerce_tax_round_at_subtotal option - how should we handle this with precision?
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* @todo woocommerce_calculate_totals action for carts.
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* @todo woocommerce_calculated_total filter for carts.
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* @since 3.2.0
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*/
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class WC_Totals {
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/**
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* Reference to cart or order object.
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*
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* @since 3.2.0
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* @var array
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*/
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private $object;
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/**
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* Line items to calculate.
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*
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* @since 3.2.0
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* @var array
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*/
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private $items = array();
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/**
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* Fees to calculate.
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*
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* @since 3.2.0
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* @var array
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*/
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private $fees = array();
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/**
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* Shipping costs.
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*
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* @since 3.2.0
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* @var array
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*/
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private $shipping = array();
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/**
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* Discount amounts in cents after calculation for the cart.
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*
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* @since 3.2.0
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* @var array
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*/
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private $discount_totals = array();
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/**
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* Precision so we can work in cents.
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*
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* @since 3.2.0
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* @var int
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*/
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private $precision = 1;
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/**
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* Stores totals.
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*
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* @since 3.2.0
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* @var array
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*/
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private $totals = array(
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'fees_total' => 0,
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'fees_total_tax' => 0,
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'items_subtotal' => 0,
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'items_subtotal_tax' => 0,
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'items_total' => 0,
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'items_total_tax' => 0,
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'total' => 0,
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'taxes' => array(),
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'tax_total' => 0,
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'shipping_total' => 0,
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'shipping_tax_total' => 0,
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'discounts_total' => 0,
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'discounts_tax_total' => 0,
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);
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/**
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* Sets up the items provided, and calculate totals.
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*
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* @since 3.2.0
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* @param object $cart Cart or order object to calculate totals for.
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*/
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public function __construct( &$cart = null ) {
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$this->precision = pow( 10, wc_get_price_decimals() );
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$this->object = $cart;
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$this->set_items();
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$this->calculate();
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}
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/**
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* Handles a cart or order object passed in for calculation. Normalises data
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* into the same format for use by this class.
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*
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* @since 3.2.0
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*/
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private function set_items() {
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if ( is_a( $this->object, 'WC_Cart' ) ) {
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foreach ( $this->object->get_cart() as $cart_item_key => $cart_item ) {
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$item = $this->get_default_item_props();
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$item->key = $cart_item_key;
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$item->quantity = $cart_item['quantity'];
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$item->price = $this->add_precision( $cart_item['data']->get_price() ) * $cart_item['quantity'];
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$item->product = $cart_item['data'];
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$this->items[ $cart_item_key ] = $item;
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}
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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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private 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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private 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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* Get default blank set of props used per item.
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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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private function get_default_item_props() {
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return (object) array(
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'key' => '',
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'quantity' => 0,
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'price' => 0,
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'product' => false,
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'price_includes_tax' => wc_prices_include_tax(),
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'subtotal' => 0,
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'subtotal_tax' => 0,
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'subtotal_taxes' => array(),
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'total' => 0,
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'total_tax' => 0,
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'taxes' => array(),
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'discounted_price' => 0,
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);
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}
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/**
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* Get default blank set of props used per fee.
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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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private function get_default_fee_props() {
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return (object) array(
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'total_tax' => 0,
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'taxes' => array(),
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);
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}
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/**
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* Get default blank set of props used per shipping row.
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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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private function get_default_shipping_props() {
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return (object) array(
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'total' => 0,
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'total_tax' => 0,
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'taxes' => array(),
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);
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}
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/**
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* Only ran if woocommerce_adjust_non_base_location_prices is true.
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*
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* If the customer is outside of the base location, this removes the base
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* taxes. This is off by default unless the filter is used.
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*
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* @since 3.2.0
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* @param object $item Item to adjust the prices of.
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* @return object
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*/
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private function adjust_non_base_location_price( $item ) {
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$base_tax_rates = WC_Tax::get_base_tax_rates( $item->product->tax_class );
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$item_tax_rates = $this->get_item_tax_rates( $item );
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if ( $item_tax_rates !== $base_tax_rates ) {
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// Work out a new base price without the shop's base tax.
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$taxes = WC_Tax::calc_tax( $item->price, $base_tax_rates, true, true );
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// Now we have a new item price (excluding TAX).
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$item->price = $item->price - array_sum( $taxes );
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$item->price_includes_tax = false;
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}
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return $item;
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}
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/**
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* Get discounted price of an item with precision (in cents).
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*
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* @since 3.2.0
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* @param object $item Item to get the price of.
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* @return int
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*/
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private function get_discounted_price_in_cents( $item ) {
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return $item->price - $this->discount_totals[ $item->key ];
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}
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/**
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* Get tax rates for an item. Caches rates in class to avoid multiple look ups.
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*
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* @param object $item Item to get tax rates for.
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* @return array of taxes
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*/
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private function get_item_tax_rates( $item ) {
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$tax_class = $item->product->get_tax_class();
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return isset( $this->item_tax_rates[ $tax_class ] ) ? $this->item_tax_rates[ $tax_class ] : $this->item_tax_rates[ $tax_class ] = WC_Tax::get_rates( $item->product->get_tax_class() );
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}
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/**
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* Return array of coupon objects from the cart or an order.
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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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private function get_coupons() {
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if ( is_a( $this->object, 'WC_Cart' ) ) {
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return $this->object->get_coupons();
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}
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}
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/**
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* Get a single total with or without precision (in cents).
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*
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* @since 3.2.0
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* @param string $key Total to get.
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* @param bool $in_cents Should the totals be returned in cents, or without precision.
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* @return int|float
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*/
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public function get_total( $key = 'total', $in_cents = false ) {
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$totals = $this->get_totals( $in_cents );
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return isset( $totals[ $key ] ) ? $totals[ $key ] : 0;
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}
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/**
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* Set a single total.
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*
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* @since 3.2.0
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* @param string $key Total name you want to set.
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* @param int $total Total to set.
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*/
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private function set_total( $key = 'total', $total ) {
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$this->totals[ $key ] = $total;
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}
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/**
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* Get all totals with or without precision (in cents).
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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_totals( $in_cents = false ) {
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return $in_cents ? $this->totals : array_map( array( $this, 'remove_precision' ), $this->totals );
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}
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/**
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* Get all tax rows from items (including shipping and product line items).
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*
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* @since 3.2.0
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* @return array
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*/
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private function get_merged_taxes() {
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$taxes = array();
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foreach ( array_merge( $this->items, $this->fees, $this->shipping ) as $item ) {
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foreach ( $item->taxes as $rate_id => $rate ) {
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$taxes[ $rate_id ] = array( 'tax_total' => 0, 'shipping_tax_total' => 0 );
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}
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}
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foreach ( $this->items + $this->fees as $item ) {
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foreach ( $item->taxes as $rate_id => $rate ) {
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$taxes[ $rate_id ]['tax_total'] = $taxes[ $rate_id ]['tax_total'] + $rate;
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}
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}
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foreach ( $this->shipping as $item ) {
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foreach ( $item->taxes as $rate_id => $rate ) {
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$taxes[ $rate_id ]['shipping_tax_total'] = $taxes[ $rate_id ]['shipping_tax_total'] + $rate;
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}
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}
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return $taxes;
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}
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/*
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|--------------------------------------------------------------------------
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| Calculation methods.
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|--------------------------------------------------------------------------
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*/
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/**
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* Run all calculations methods on the given items in sequence.
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*
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* @since 3.2.0
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*/
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private function calculate() {
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$this->calculate_item_subtotals();
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$this->calculate_discounts();
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$this->calculate_item_totals();
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$this->calculate_fee_totals();
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$this->calculate_shipping_totals();
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$this->calculate_totals();
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}
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/**
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* Subtotals are costs before discounts.
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*
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* To prevent rounding issues we need to work with the inclusive price where possible.
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* otherwise we'll see errors such as when working with a 9.99 inc price, 20% VAT which would.
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* be 8.325 leading to totals being 1p off.
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*
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* Pre tax coupons come off the price the customer thinks they are paying - tax is calculated.
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* afterwards.
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*
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* e.g. $100 bike with $10 coupon = customer pays $90 and tax worked backwards from that.
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*
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* @since 3.2.0
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*/
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private function calculate_item_subtotals() {
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foreach ( $this->items as $item ) {
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if ( $item->price_includes_tax && apply_filters( 'woocommerce_adjust_non_base_location_prices', true ) ) {
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$item = $this->adjust_non_base_location_price( $item );
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}
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$item->subtotal = $item->price;
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$item->subtotal_tax = 0;
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if ( wc_tax_enabled() && $item->product->is_taxable() ) {
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$item->subtotal_taxes = WC_Tax::calc_tax( $item->subtotal, $this->get_item_tax_rates( $item ), $item->price_includes_tax );
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$item->subtotal_tax = array_sum( $item->subtotal_taxes );
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if ( $item->price_includes_tax ) {
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$item->subtotal = $item->subtotal - $item->subtotal_tax;
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}
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}
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}
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$this->set_total( 'items_subtotal', array_sum( array_values( wp_list_pluck( $this->items, 'subtotal' ) ) ) );
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$this->set_total( 'items_subtotal_tax', array_sum( array_values( wp_list_pluck( $this->items, 'subtotal_tax' ) ) ) );
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}
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/**
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* Calculate all discount and coupon amounts.
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*
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* @todo Manual discounts.
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* @todo record coupon totals and counts for cart.
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*
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* @since 3.2.0
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* @uses WC_Discounts class.
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*/
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private function calculate_discounts() {
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$discounts = new WC_Discounts( $this->items );
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foreach ( $this->get_coupons() as $coupon ) {
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$discounts->apply_coupon( $coupon );
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}
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$this->discount_totals = $discounts->get_discounts( true );
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$this->totals['discounts_total'] = array_sum( $this->discount_totals );
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// See how much tax was 'discounted'.
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if ( wc_tax_enabled() ) {
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foreach ( $this->discount_totals as $cart_item_key => $discount ) {
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$item = $this->items[ $cart_item_key ];
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if ( $item->product->is_taxable() ) {
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$tax_rates = $this->get_item_tax_rates( $item );
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$taxes = WC_Tax::calc_tax( $discount, $tax_rates, false );
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$this->totals['discounts_tax_total'] += array_sum( $taxes );
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}
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}
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}
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}
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/**
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* Totals are costs after discounts. @todo move cart specific setters to subclass?
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*
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* @since 3.2.0
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*/
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private function calculate_item_totals() {
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foreach ( $this->items as $item ) {
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$item->total = $this->get_discounted_price_in_cents( $item );
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$item->total_tax = 0;
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if ( wc_tax_enabled() && $item->product->is_taxable() ) {
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$item->taxes = WC_Tax::calc_tax( $item->total, $this->get_item_tax_rates( $item ), $item->price_includes_tax );
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$item->total_tax = array_sum( $item->taxes );
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if ( $item->price_includes_tax ) {
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$item->total = $item->total - $item->total_tax;
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} else {
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$item->total = $item->total;
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}
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}
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}
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$this->set_total( 'items_total', array_sum( array_values( wp_list_pluck( $this->items, 'total' ) ) ) );
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$this->set_total( 'items_total_tax', array_sum( array_values( wp_list_pluck( $this->items, 'total_tax' ) ) ) );
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$this->object->subtotal = array_sum( wp_list_pluck( $this->items, 'total' ) ) + array_sum( wp_list_pluck( $this->items, 'total_tax' ) );
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$this->object->subtotal_ex_tax = array_sum( wp_list_pluck( $this->items, 'total' ) );
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}
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/**
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* Triggers the cart fees API, grabs the list of fees, and calculates taxes.
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*
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* Note: This class sets the totals for the 'object' as they are calculated. This is so that APIs like the fees API can see these totals if needed.
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*
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* @since 3.2.0
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* @todo logic is unqiue to carts.
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*/
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private function calculate_fee_totals() {
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$this->fees = array();
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$this->object->calculate_fees();
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foreach ( $this->object->get_fees() as $fee_key => $fee_object ) {
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$fee = $this->get_default_fee_props();
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$fee->object = $fee_object;
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$fee->total = $this->add_precision( $fee->object->amount );
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if ( wc_tax_enabled() && $fee->object->taxable ) {
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$fee->taxes = WC_Tax::calc_tax( $fee->total, WC_Tax::get_rates( $fee->object->tax_class ), false );
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$fee->total_tax = array_sum( $fee->taxes );
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}
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$this->fees[ $fee_key ] = $fee;
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}
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// Store totals to self.
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$this->set_total( 'fees_total', array_sum( wp_list_pluck( $this->fees, 'total' ) ) );
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$this->set_total( 'fees_total_tax', array_sum( wp_list_pluck( $this->fees, 'total_tax' ) ) );
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// Transfer totals to the cart.
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foreach ( $this->fees as $fee_key => $fee ) {
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$this->object->fees[ $fee_key ]->tax = $this->remove_precision( $fee->total_tax );
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$this->object->fees[ $fee_key ]->tax_data = $this->remove_precision( $fee->taxes );
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}
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$this->object->fee_total = $this->remove_precision( array_sum( wp_list_pluck( $this->fees, 'total' ) ) );
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}
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/**
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* Calculate any shipping taxes.
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*
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* @since 3.2.0
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*/
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private function calculate_shipping_totals() {
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$this->shipping = array();
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foreach ( $this->object->calculate_shipping() as $key => $shipping_object ) {
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$shipping_line = $this->get_default_shipping_props();
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$shipping_line->total = $this->add_precision( $shipping_object->cost );
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$shipping_line->taxes = array_map( array( $this, 'add_precision' ), $shipping_object->taxes );
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|
$shipping_line->total_tax = array_sum( $shipping_object->taxes );
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|
$this->shipping[ $key ] = $shipping_line;
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}
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|
|
|
$this->set_total( 'shipping_total', array_sum( wp_list_pluck( $this->shipping, 'total' ) ) );
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|
$this->set_total( 'shipping_tax_total', array_sum( wp_list_pluck( $this->shipping, 'total_tax' ) ) );
|
|
}
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|
|
|
/**
|
|
* Main cart totals.
|
|
*
|
|
* @since 3.2.0
|
|
*/
|
|
private function calculate_totals() {
|
|
$this->set_total( 'taxes', $this->get_merged_taxes() );
|
|
$this->set_total( 'tax_total', array_sum( wp_list_pluck( $this->get_total( 'taxes', true ), 'tax_total' ) ) );
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|
$this->set_total( 'shipping_tax_total', array_sum( wp_list_pluck( $this->get_total( 'taxes', true ), 'shipping_tax_total' ) ) );
|
|
$this->set_total( 'total', round( $this->get_total( 'items_total', true ) + $this->get_total( 'fees_total', true ) + $this->get_total( 'shipping_total', true ) + $this->get_total( 'tax_total', true ) + $this->get_total( 'shipping_tax_total', true ) ) );
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|
}
|
|
}
|