public function redeem($cart)
{
// Check the discount is valid
if (!$this->is_valid()) {
throw new Error500('Discount is not valid');
}
// Check the cart hasn't been fully discounted already
if ($cart->has_exclusive_discount()) {
throw new Error500('This cart cannot have any more discounts');
}
if ($this->exclusive && count($cart->discounts()) > 0) {
throw new Error500('You cannot add this discount while there are other discounts');
}
// Grab all cart items referenced by a discount
$id = mysql_real_escape_string($cart->id);
$discounts = DiscountRedemption::find_all("carts.id = '{$id}'");
foreach ($discounts as $discount) {
if ($discount->discount->id == $this->id) {
throw new Error500('That discount has already been added');
}
}
if ($this->loyalty) {
$user_id = mysql_real_escape_string($cart->user_id);
$id = mysql_real_escape_string($this->id);
$ld = LoyaltyDiscount::find("users.id = '{$user_id}' AND discount_codes.id = '{$id}'");
if (!$ld) {
throw new Error500('You are not allowed to use this discount');
}
}
// If this is a full cart discount, apply it
if ($this->full_cart_discount) {
$this->add_for_cart($cart);
return true;
}
// Let's get some sorted discount items
$services = array();
foreach ($this->services() as $item) {
$services[] = $item->item->id;
}
$tickets = array();
foreach ($this->tickets() as $item) {
$tickets[] = $item->item->id;
}
$discounted = false;
$count = $this->count_redemptions();
$availableQuantity = $this->quantity - $count;
foreach ($cart->items() as $item) {
if ($availableQuantity <= 0) {
break;
}
// We now need to check if the item can be discounted
if (is_a($item->object, 'EventSignup')) {
// We need to check the item's EventTicket
if (!in_array($item->object->event_ticket_id, $tickets)) {
continue;
}
} elseif (is_a($item->object, 'EventService')) {
// Check that the Service is allowed
if (!in_array($item->object->service_id, $services)) {
continue;
}
}
$this->add_for_cart($cart, $item);
$discounted = true;
$availableQuantity--;
}
if (!$discounted) {
throw new Error500('There is nothing that can be discounted');
}
return true;
}
