package profile

import (
	"fmt"

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

// HandleLinkCart links a cart grain to this user profile.
func HandleLinkCart(p *ProfileGrain, m *messages.LinkCart) error {
	if m == nil {
		return fmt.Errorf("LinkCart: nil payload")
	}
	if m.CartId == 0 {
		return fmt.Errorf("LinkCart: cartId is required")
	}
	// Check for duplicate
	for _, c := range p.Carts {
		if c.CartId == m.CartId {
			return nil // already linked; idempotent
		}
	}
	p.Carts = append(p.Carts, LinkedCart{
		CartId: m.CartId,
		Label:  m.Label,
	})
	return nil
}

// HandleLinkCheckout links a checkout grain to this user profile.
func HandleLinkCheckout(p *ProfileGrain, m *messages.LinkCheckout) error {
	if m == nil {
		return fmt.Errorf("LinkCheckout: nil payload")
	}
	if m.CheckoutId == 0 {
		return fmt.Errorf("LinkCheckout: checkoutId is required")
	}
	// Check for duplicate
	for _, ch := range p.Checkouts {
		if ch.CheckoutId == m.CheckoutId {
			return nil // already linked; idempotent
		}
	}
	p.Checkouts = append(p.Checkouts, LinkedCheckout{
		CheckoutId: m.CheckoutId,
		CartId:     m.CartId,
	})
	return nil
}

// HandleLinkOrder links an order to this user profile.
func HandleLinkOrder(p *ProfileGrain, m *messages.LinkOrder) error {
	if m == nil {
		return fmt.Errorf("LinkOrder: nil payload")
	}
	if m.OrderReference == "" {
		return fmt.Errorf("LinkOrder: orderReference is required")
	}
	// Check for duplicate (by index so we can mutate)
	for i := range p.Orders {
		if p.Orders[i].OrderReference == m.OrderReference {
			// Update status snapshot
			p.Orders[i].Status = m.Status
			return nil
		}
	}
	p.Orders = append(p.Orders, LinkedOrder{
		OrderReference: m.OrderReference,
		CartId:         m.CartId,
		Status:         m.Status,
	})
	return nil
}