/** calculate totals for the items in the cart */
public static function calculate_totals()
{
// extracted cart totals so that the constructor can call it, rather than
// this full method. Cart totals are needed for cart widget and themes.
// Don't want to call shipping api's multiple times per page load
self::calculate_cart_total();
// Cart Shipping
if (self::needs_shipping()) {
jigoshop_shipping::calculate_shipping(self::$tax);
} else {
jigoshop_shipping::reset_shipping();
}
self::$shipping_total = jigoshop_shipping::get_total();
$shipping_method = jigoshop_shipping::get_chosen_method();
if (self::get_options()->get('jigoshop_calc_taxes') == 'yes') {
self::$tax->calculate_shipping_tax(self::$shipping_total, $shipping_method);
self::$shipping_tax_total = self::$tax->get_total_shipping_tax_amount();
}
// Subtotal
self::$subtotal_ex_tax = self::$cart_contents_total_ex_tax;
self::$subtotal = self::$cart_contents_total;
if (self::get_options()->get('jigoshop_calc_taxes') == 'yes' && !self::$tax->get_total_shipping_tax_amount()) {
foreach (self::get_applied_tax_classes() as $tax_class) {
if (!self::is_not_compounded_tax($tax_class)) {
//tax compounded
$discount = self::get_options()->get('jigoshop_tax_after_coupon') == 'yes' ? self::$discount_total : 0;
self::$tax->update_tax_amount($tax_class, (self::$subtotal_ex_tax - $discount + self::$tax->get_non_compounded_tax_amount() + self::$shipping_total) * 100);
}
}
}
self::$total = self::get_cart_subtotal(false) + self::get_cart_shipping_total(false);
if (self::get_options()->get('jigoshop_calc_taxes') == 'yes' && self::get_options()->get('jigoshop_prices_include_tax') == 'no' && self::get_options()->get('jigoshop_tax_after_coupon') == 'no') {
self::$total += self::$tax->get_non_compounded_tax_amount() + self::$tax->get_compound_tax_amount();
}
// calculate any cart wide discounts from coupons
$total_product_discounts = self::$discount_total;
self::$discount_total = $total_cart_discounts = $temp = 0;
if (self::get_options()->get('jigoshop_tax_after_coupon') == 'yes') {
// we need products and shipping with tax out
$total_cart_discounts = round(self::calculate_cart_discounts_total(self::$cart_contents_total_ex_tax + self::get_cart_shipping_total(false, true)), 2);
if ($total_cart_discounts > 0) {
$total_to_use = self::$cart_contents_total_ex_tax + self::$shipping_total;
if ($total_cart_discounts > $total_to_use) {
$total_cart_discounts = $total_to_use - $total_product_discounts;
}
$total_tax = self::$tax->get_non_compounded_tax_amount() + self::$tax->get_compound_tax_amount() - self::$tax->get_total_shipping_tax_amount();
if ($total_tax > 0) {
foreach (self::get_applied_tax_classes() as $tax_class) {
$rate = self::$tax->get_rate($tax_class);
$tax = self::$tax->calc_tax(self::$price_per_tax_class_ex_tax[$tax_class], $rate, false);
$discounts = 0.0;
$total_tax_part = $tax / $total_tax;
// Lower tax by coupon amounts
foreach (jigoshop_cart::get_coupons() as $code) {
$coupon = JS_Coupons::get_coupon($code);
switch ($coupon['type']) {
case 'fixed_cart':
$discounts += self::$tax->calc_tax($coupon['amount'] * $total_tax_part, $rate, false);
break;
case 'percent':
$discounts += self::$tax->calc_tax($coupon['amount'] * self::$price_per_tax_class_ex_tax[$tax_class] / ($total_tax_part * 100), $rate, false);
$discounts += $coupon['amount'] * self::$tax->get_shipping_tax($tax_class) / 100;
break;
}
}
$tax -= $discounts;
self::$tax->update_tax_amount($tax_class, $tax * 100, false, true);
}
}
// check again in case tax calcs are disabled
$total_discounts = $total_cart_discounts + $total_product_discounts;
if ($total_discounts > $total_to_use) {
$total_cart_discounts = $total_to_use - $total_product_discounts;
}
}
foreach (self::get_applied_tax_classes() as $tax_class) {
$temp += self::$tax->get_tax_amount($tax_class);
}
if (self::get_options()->get('jigoshop_prices_include_tax') == 'no') {
self::$total += $temp;
} else {
self::$total = self::$cart_contents_total_ex_tax + self::$shipping_total + $temp;
}
} else {
// Taxes are applied before coupons, 'jigoshop_tax_after_coupon' == 'no'
if (self::get_options()->get('jigoshop_prices_include_tax') == 'no') {
$total_cart_discounts = self::calculate_cart_discounts_total(self::$total);
if ($total_cart_discounts > self::$total) {
$total_cart_discounts = self::$total - $total_product_discounts;
}
} else {
$total_cart_discounts = self::calculate_cart_discounts_total(self::$cart_contents_total_ex_tax + self::$shipping_total);
if ($total_cart_discounts > 0) {
// with an initial discount, recalc taxes and get a proper discount
foreach (self::get_applied_tax_classes() as $tax_class) {
$rate = self::$tax->get_rate($tax_class);
$tax = self::$tax->calc_tax(self::$cart_contents_total_ex_tax, $rate, false);
self::$tax->update_tax_amount($tax_class, $tax * 100, false, true);
$temp += self::$tax->get_tax_amount($tax_class);
}
$total_to_use = self::$cart_contents_total_ex_tax + self::$shipping_total + $temp;
$total_cart_discounts = self::calculate_cart_discounts_total($total_to_use);
if ($total_cart_discounts > $total_to_use) {
$total_cart_discounts = $total_to_use - $total_product_discounts;
}
}
}
}
// set the final discount
self::$discount_total = $total_cart_discounts + $total_product_discounts;
// adjust the grand total after all discounts
self::$total -= self::$discount_total;
if (self::$total < 0) {
self::$total = 0;
}
// with everything calculated, check that coupons depending on cart totals are still valid
// if they are not, remove them and recursively re-calculate everything all over again.
$recalc = false;
if (!empty(self::$applied_coupons)) {
foreach (self::$applied_coupons as $key => $code) {
if (!self::is_valid_coupon($code)) {
unset(self::$applied_coupons[$key]);
jigoshop_session::instance()->coupons = self::$applied_coupons;
$recalc = true;
}
}
}
if ($recalc) {
self::calculate_totals();
}
}