package checkout

import (
	"errors"
	"slices"

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

func HandlePaymentCancelled(g *CheckoutGrain, m *messages.CancelPayment) error {

	payment, found := g.FindPayment(m.PaymentId)
	if !found {
		return ErrPaymentNotFound
	}
	if payment.CompletedAt != nil {
		return errors.New("payment already completed")
	}
	g.PaymentInProgress--
	g.AmountInCentsStarted -= payment.Amount
	g.Payments = removePayment(g.Payments, payment.PaymentId)

	return nil
}

func removePayment(payment []*Payment, s string) []*Payment {
	return slices.DeleteFunc(payment, func(p *Payment) bool {
		return p.PaymentId == s
	})
}