package cart

import (
	"fmt"
	"time"

	messages "git.k6n.net/go-cart-actor/pkg/messages"
)

// PaymentStarted registers the beginning of a payment attempt for a cart.
// It either upserts the payment entry (based on paymentId) or creates a new one,
// marks the cart as having an in-progress payment, and recalculates the PaidInFull flag.
func PaymentCompleted(grain *CartGrain, msg *messages.PaymentCompleted) error {
	if msg == nil {
		return fmt.Errorf("PaymentStarted: nil payload")
	}
	paymentId := msg.PaymentId
	payment, found := grain.FindPayment(paymentId)
	if !found {
		return fmt.Errorf("PaymentStarted: payment not found")
	}

	payment.ProcessorReference = msg.ProcessorReference
	payment.Status = PaymentStatusSuccess
	payment.Amount = msg.Amount
	payment.Currency = msg.Currency
	payment.CompletedAt = asPointer(time.Now())

	// maybe update cart status
	grain.PaymentInProgress--

	return nil
}