add profile actors

pkg/profile/mutation_links.go

@@ -0,0 +1,73 @@
+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
+}