Reservair/includes/Services/Forms/Pricing/RsvFormCalculatedValues.php

<?php

/** Values derived from a submission (not entered by the visitor), exposed to templates. */
final class RsvFormCalculatedValues {
    /** @return array<string, mixed> */
    public function for(RsvFormDefinition $definition, RsvFormData $data): array {
        $calculator = new RsvFormPriceCalculator();
        global $rsv_form_price_registry;

        $price_before_discount = 0.0;
        foreach ($definition->getElements() as $element) {
            $element_calculator = $rsv_form_price_registry->get($element->getType());
            if ($element_calculator === null) {
                continue;
            }
            $price_before_discount += (float) $element_calculator($element, $data->getValue($element->getName()));
        }

        $discount_detail = (new RsvMembershipService())->discount_detail_for($definition, $data);
        $discount_pct = $discount_detail['percent'];
        $final_price = $calculator->calculate($definition, $data);
        $subtotal = $price_before_discount;
        $discount_amount = $subtotal - $final_price;

        return [
            'price' => $final_price,
            'price_before_discount' => $price_before_discount,
            'discount_percent' => $discount_pct,
            'pricing' => [
                'currency' => 'CZK',
                'subtotal' => $subtotal,
                'discount' => $discount_pct > 0.0 ? [
                    'percent' => $discount_pct,
                    'amount'  => round($discount_amount, 2),
                    'reason'  => $discount_detail['reason'],
                ] : null,
                'total' => $final_price,
            ],
        ];
    }

    /**
     * The names these values expose, so template validation accepts {{ price }}.
     * @return list<string>
     */
    public static function names(): array {
        return ['price', 'price_before_discount', 'discount_percent', 'pricing'];
    }
}