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woocommerce
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Cart discount logic

This commit is contained in:
Mike Jolley 2011-11-23 23:19:23 +00:00
parent a7600ba875
commit a60bb20d57
1 changed files with 105 additions and 31 deletions
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136
classes/cart.class.php
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@ -325,9 +325,7 @@ class woocommerce_cart {
* Function to apply discounts to a product and get the discounted price (before tax is applied)
*/
function get_discounted_price( $values, $price ) {
$this->discount_product = 0;
if ($this->applied_coupons) foreach ($this->applied_coupons as $code) :
$coupon = &new woocommerce_coupon( $code );
@ -369,11 +367,19 @@ class woocommerce_cart {
// Apply the discount
if ($this_item_is_discounted) :
if ($coupon->type=='fixed_product') :
$this->discount_product = $this->discount_product + ( $coupon->amount * $values['quantity'] );
if ($price < $coupon->amount) :
$discount_amount = $price;
else :
$discount_amount = $coupon->amount;
endif;
$price = $price - $coupon->amount;
if ($price<0) $price = 0;
$this->discount_product = $this->discount_product + ( $discount_amount * $values['quantity'] );
elseif ($coupon->type=='percent_product') :
$percent_discount = ( $values['data']->get_price_excluding_tax( false ) / 100 ) * $coupon->amount;
@ -388,21 +394,46 @@ class woocommerce_cart {
break;
case "fixed_cart" :
/**
* This is the most complex discount - we need to divide the discount between rows based on their price in
* proportion to the subtotal. This is so rows with different tax rates get a fair discount, and so rows
* with no price (free) don't get discount too.
*/
// Get item discount by dividing item cost by subtotal to get a %
$discount_percent = ($values['data']->get_price_excluding_tax( false )*$values['quantity']) / $this->subtotal_ex_tax;
// Use pence to help prevent rounding errors
$coupon_amount_pence = $coupon->amount * 100;
// Get item discount by dividing by total number of products in the cart
$item_discount = $coupon_amount_pence / $this->cart_contents_count;
// Work out the discount for the row
$item_discount = $coupon_amount_pence * $discount_percent;
// Work out discount per item
$item_discount = $item_discount / $values['quantity'];
// Pence
$price = ( $price * 100 );
// Check if discount is more than price
if ($price < $item_discount) :
$discount_amount = $price;
else :
$discount_amount = $item_discount;
endif;
// Take discount off of price (in pence)
$price = ( $price * 100 ) - $item_discount;
$price = $price - $discount_amount;
// Back to pounds
$price = $price / 100;
// Cannot be below 0
if ($price<0) $price = 0;
// Add coupon to discount total (once, since this is a fixed cart discount and we don't want rounding issues)
$this->discount_product = $this->discount_product + (($item_discount*$values['quantity']) / 100);
$this->discount_product = $this->discount_product + (($discount_amount*$values['quantity']) / 100);
break;
@ -470,7 +501,15 @@ class woocommerce_cart {
// Apply the discount
if ($this_item_is_discounted) :
if ($coupon->type=='fixed_product') :
$this->discount_total = $this->discount_total + ( $coupon->amount * $values['quantity'] );
if ($price < $coupon->amount) :
$discount_amount = $price;
else :
$discount_amount = $coupon->amount;
endif;
$this->discount_total = $this->discount_total + ( $discount_amount * $values['quantity'] );
elseif ($coupon->type=='percent_product') :
$this->discount_total = $this->discount_total + ( $price / 100 ) * $coupon->amount;
endif;
@ -522,12 +561,59 @@ class woocommerce_cart {
$this->reset_totals();
// Get count of all items + weights
// Get count of all items + weights + subtotal (we may need this for discounts)
if (sizeof($this->cart_contents)>0) foreach ($this->cart_contents as $cart_item_key => $values) :
$this->cart_contents_weight = $this->cart_contents_weight + ($values['data']->get_weight() * $values['quantity']);
$_product = $values['data'];
$this->cart_contents_weight = $this->cart_contents_weight + ($_product->get_weight() * $values['quantity']);
$this->cart_contents_count = $this->cart_contents_count + $values['quantity'];
// Base Price (inlusive of tax for now)
$base_price = $_product->get_price();
$tax_amount = 0;
if ($this->prices_include_tax) :
if ( get_option('woocommerce_calc_taxes')=='yes' && $_product->is_taxable() ) :
$tax_rate = $this->tax->get_shop_base_rate( $_product->get_tax_class() );
$tax_amount = $this->tax->calc_tax( $base_price * $values['quantity'], $tax_rate, true );
// Rounding
if ( get_option( 'woocommerce_tax_round_at_subtotal' ) == 'no' ) :
$tax_amount = round( $tax_amount, 2 );
endif;
endif;
// Sub total is based on base prices (without discounts)
$this->subtotal = $this->subtotal + ( $base_price * $values['quantity'] );
$this->subtotal_ex_tax = $this->subtotal_ex_tax + ( $base_price * $values['quantity'] ) - round($tax_amount, 2);
else :
if ( get_option('woocommerce_calc_taxes')=='yes' && $_product->is_taxable() ) :
$tax_rate = $this->tax->get_rate( $_product->get_tax_class() );
$tax_amount = $this->tax->calc_tax( $base_price * $values['quantity'], $tax_rate, false );
// Rounding
if ( get_option( 'woocommerce_tax_round_at_subtotal' ) == 'no' ) :
$tax_amount = round( $tax_amount, 2 );
endif;
endif;
// Sub total is based on base prices (without discounts)
$this->subtotal = $this->subtotal + ( $base_price * $values['quantity'] ) + $tax_amount;
$this->subtotal_ex_tax = $this->subtotal_ex_tax + ($base_price * $values['quantity']);
endif;
endforeach;
// Now calc the main totals, including discounts
if ($this->prices_include_tax) :
/**
@ -566,8 +652,7 @@ class woocommerce_cart {
/**
* Regular tax calculation (customer inside base and the tax class is unmodified
*/
$tax_amount = $this->tax->calc_tax( $base_price * $values['quantity'], $tax_rate, true );
*/
$discounted_tax_amount = $this->tax->calc_tax( $discounted_price * $values['quantity'], $tax_rate, true );
/**
@ -600,13 +685,12 @@ class woocommerce_cart {
// Rounding
if ( get_option( 'woocommerce_tax_round_at_subtotal' ) == 'no' ) :
$tax_amount = round( $tax_amount, 2 );
$discounted_tax_amount = round( $discounted_tax_amount, 2 );
endif;
else :
$tax_amount = $discounted_tax_amount = 0;
$discounted_tax_amount = 0;
endif;
@ -622,10 +706,6 @@ class woocommerce_cart {
// Cart contents total is based on discounted prices and is used for the final total calculation
$this->cart_contents_total = $this->cart_contents_total + $total_item_price;
// Sub total is based on base prices (without discounts)
$this->subtotal = $this->subtotal + ( $base_price * $values['quantity'] );
$this->subtotal_ex_tax = $this->subtotal_ex_tax + ( $base_price * $values['quantity'] ) - round($tax_amount, 2);
endforeach; endif;
else :
@ -643,24 +723,22 @@ class woocommerce_cart {
$base_price = $_product->get_price_excluding_tax();
// Discounted Price (base price with any pre-tax discounts applied
$discounted_price = $this->get_discounted_price( $values, $base_price );
$discounted_price = $this->get_discounted_price( $values, $base_price );
// Tax Amount (For the line, based on discounted, ex.tax price)
if ( get_option('woocommerce_calc_taxes')=='yes' && $_product->is_taxable() ) :
// Now calc product rates
$tax_rate = $this->tax->get_rate( $_product->get_tax_class() );
$tax_amount = $this->tax->calc_tax( $base_price * $values['quantity'], $tax_rate, false );
$discounted_tax_amount = $this->tax->calc_tax( $discounted_price * $values['quantity'], $tax_rate, false );
// Rounding
if ( get_option( 'woocommerce_tax_round_at_subtotal' ) == 'no' ) :
$tax_amount = round( $tax_amount, 2 );
$discounted_tax_amount = round( $discounted_tax_amount, 2 );
endif;
else :
$tax_amount = $discounted_tax_amount = 0;
$discounted_tax_amount = 0;
endif;
// Total item price (price, discount and quantity)
@ -674,10 +752,6 @@ class woocommerce_cart {
// Cart contents total is based on discounted prices and is used for the final total calculation
$this->cart_contents_total = $this->cart_contents_total + $total_item_price;
// Sub total is based on base prices (without discounts)
$this->subtotal = $this->subtotal + ( $base_price * $values['quantity'] ) + $tax_amount;
$this->subtotal_ex_tax = $this->subtotal_ex_tax + $base_price * $values['quantity'];
endforeach; endif;
@ -982,7 +1056,7 @@ class woocommerce_cart {
function get_product_subtotal( $price, $tax_rate, $quantity ) {
global $woocommerce;
if ( get_option('woocommerce_calc_taxes')=='yes' && $tax_rate>0 && (get_option('woocommerce_display_cart_prices_excluding_tax')=='yes' || !$this->prices_include_tax) ) :
if ( get_option('woocommerce_calc_taxes')=='yes' && $tax_rate>0 && (get_option('woocommerce_display_cart_prices_excluding_tax')=='yes' && $this->prices_include_tax) ) :
$tax_amount = $this->tax->calc_tax( $price * $quantity, $tax_rate, true );
$row_price = ( $price * $quantity ) - round($tax_amount, 2);
@ -991,7 +1065,7 @@ class woocommerce_cart {
$return .= ' <small class="tax_label">'.$woocommerce->countries->ex_tax_or_vat().'</small>';
else :
$row_price = $price * $quantity;
$return = woocommerce_price( $row_price );