$discountsToApply List of discount IDs to apply, ordered by priority * @param array $discountsToRemove List of discount IDs that should be removed from cart */ public function __construct( private readonly bool $canApply, private readonly array $discountsToApply, private readonly array $discountsToRemove = [], private readonly ?string $rejectionReason = null ) { } /** * Check if the new discount can be applied to the cart */ public function canApply(): bool { return $this->canApply; } /** * Get the ordered list of discount IDs that should be applied to the cart * The order reflects the priority of application (first = applied first) * * @return array */ public function getDiscountsToApply(): array { return $this->discountsToApply; } /** * Get the list of discount IDs that need to be removed from the cart * * @return array */ public function getDiscountsToRemove(): array { return $this->discountsToRemove; } /** * Get the reason why the discount was rejected (if applicable) */ public function getRejectionReason(): ?string { return $this->rejectionReason; } /** * Check if any discounts need to be removed */ public function hasDiscountsToRemove(): bool { return !empty($this->discountsToRemove); } }