mcp in cart

cmd/cart/main.go

@@ -15,6 +15,7 @@ import (
 	"git.k6n.net/mats/go-cart-actor/pkg/actor"
 	"git.k6n.net/mats/go-cart-actor/pkg/cart"
 	"git.k6n.net/mats/go-cart-actor/pkg/promotions"
+	promotionmcp "git.k6n.net/mats/go-cart-actor/pkg/promotions/mcp"
 	"git.k6n.net/mats/go-cart-actor/pkg/proxy"
 	"git.k6n.net/mats/go-cart-actor/pkg/voucher"
 	"git.k6n.net/mats/go-redis-inventory/pkg/inventory"
@@ -111,16 +112,18 @@ func main() {
 
 	controlPlaneConfig := actor.DefaultServerConfig()
 
-	promotionData, err := promotions.LoadStateFile("data/promotions.json")
+	promotionStore, err := promotions.NewStore("data/promotions.json")
 	if err != nil {
-		log.Printf("Error loading promotions: %v\n", err)
+		log.Fatalf("Error loading promotions: %v\n", err)
 	}
 
-	log.Printf("loaded %d promotions", len(promotionData.State.Promotions))
+	log.Printf("loaded %d promotions", len(promotionStore.List()))
+
+	promotionService := promotions.NewPromotionService(nil)
+	promotionMCP := promotionmcp.New(promotionStore, promotionService)
 
 	//inventoryPubSub := actor.NewPubSub[inventory.InventoryChange]()
 
-	// promotionService := promotions.NewPromotionService(nil)
 	// rdb := redis.NewClient(&redis.Options{
 	// 	Addr:     redisAddress,
 	// 	Password: redisPassword,
@@ -142,15 +145,13 @@ func main() {
 			_, span := tracer.Start(ctx, "Totals and promotions")
 			defer span.End()
 			g.UpdateTotals()
+			// Evaluate active promotions against the freshly-totalled cart and apply
+			// any matched actions (e.g. the Volymrabatt volume discount), which adjust
+			// TotalPrice/TotalDiscount on top of line items and vouchers.
+			promotionCtx := promotions.NewContextFromCart(g, promotions.WithNow(time.Now()))
+			_, actions := promotionService.EvaluateAll(promotionStore.Snapshot(), promotionCtx)
+			promotions.ApplyActions(g, actions)
 			g.Version++
-			// promotionCtx := promotions.NewContextFromCart(g, promotions.WithNow(time.Now()), promotions.WithCustomerSegment("vip"))
-			// _, actions := promotionService.EvaluateAll(promotionData.State.Promotions, promotionCtx)
-			// for _, action := range actions {
-
-			// 	log.Printf("apply: %+v", action)
-
-			// 	g.UpdateTotals()
-			// }
 			return nil
 		}),
 	)
@@ -267,6 +268,13 @@ func main() {
 	}
 
 	syncedServer.Serve(mux)
+
+	// Promotion MCP edge: list/get/upsert/status/delete promotions and preview
+	// discounts. Mutations persist to data/promotions.json and are picked up by
+	// the cart's totals processor on the next mutation (it reads a fresh snapshot).
+	mux.Handle("/mcp", promotionMCP.Handler())
+	mux.Handle("/mcp/", promotionMCP.Handler())
+
 	// only for local
 	mux.HandleFunc("GET /add/remote/{host}", func(w http.ResponseWriter, r *http.Request) {
 		pool.AddRemote(r.PathValue("host"))