more changes

cart_state_mapper.go

@@ -0,0 +1,211 @@
+package main
+
+import (
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// cart_state_mapper.go
+//
+// Utilities to translate between internal CartGrain state and the gRPC
+// (typed) protobuf representation CartState. This replaces the previous
+// JSON blob framing and enables type-safe replies over gRPC, as well as
+// internal reuse for HTTP handlers without an extra marshal / unmarshal
+// hop (you can marshal CartState directly for JSON responses if desired).
+//
+// Only the one‑way mapping (CartGrain -> CartState) is strictly required
+// for mutation / state replies. A reverse helper is included in case
+// future features (e.g. snapshot import, replay, or migration) need it.
+
+// ToCartState converts the in‑memory CartGrain into a protobuf CartState.
+func ToCartState(c *CartGrain) *messages.CartState {
+	if c == nil {
+		return nil
+	}
+
+	items := make([]*messages.CartItemState, 0, len(c.Items))
+	for _, it := range c.Items {
+		if it == nil {
+			continue
+		}
+		itemDiscountPerUnit := max(0, it.OrgPrice-it.Price)
+		itemTotalDiscount := itemDiscountPerUnit * int64(it.Quantity)
+
+		items = append(items, &messages.CartItemState{
+			Id:            int64(it.Id),
+			SourceItemId:  int64(it.ItemId),
+			Sku:           it.Sku,
+			Name:          it.Name,
+			UnitPrice:     it.Price,
+			Quantity:      int32(it.Quantity),
+			TotalPrice:    it.TotalPrice,
+			TotalTax:      it.TotalTax,
+			OrgPrice:      it.OrgPrice,
+			TaxRate:       int32(it.TaxRate),
+			TotalDiscount: itemTotalDiscount,
+			Brand:         it.Brand,
+			Category:      it.Category,
+			Category2:     it.Category2,
+			Category3:     it.Category3,
+			Category4:     it.Category4,
+			Category5:     it.Category5,
+			Image:         it.Image,
+			ArticleType:   it.ArticleType,
+			SellerId:      it.SellerId,
+			SellerName:    it.SellerName,
+			Disclaimer:    it.Disclaimer,
+			Outlet:        deref(it.Outlet),
+			StoreId:       deref(it.StoreId),
+			Stock:         int32(it.Stock),
+		})
+	}
+
+	deliveries := make([]*messages.DeliveryState, 0, len(c.Deliveries))
+	for _, d := range c.Deliveries {
+		if d == nil {
+			continue
+		}
+		itemIds := make([]int64, 0, len(d.Items))
+		for _, id := range d.Items {
+			itemIds = append(itemIds, int64(id))
+		}
+		var pp *messages.PickupPoint
+		if d.PickupPoint != nil {
+			// Copy to avoid accidental shared mutation (proto points are fine but explicit).
+			pp = &messages.PickupPoint{
+				Id:      d.PickupPoint.Id,
+				Name:    d.PickupPoint.Name,
+				Address: d.PickupPoint.Address,
+				City:    d.PickupPoint.City,
+				Zip:     d.PickupPoint.Zip,
+				Country: d.PickupPoint.Country,
+			}
+		}
+		deliveries = append(deliveries, &messages.DeliveryState{
+			Id:          int64(d.Id),
+			Provider:    d.Provider,
+			Price:       d.Price,
+			ItemIds:     itemIds,
+			PickupPoint: pp,
+		})
+	}
+
+	return &messages.CartState{
+		CartId:            c.Id.String(),
+		Items:             items,
+		TotalPrice:        c.TotalPrice,
+		TotalTax:          c.TotalTax,
+		TotalDiscount:     c.TotalDiscount,
+		Deliveries:        deliveries,
+		PaymentInProgress: c.PaymentInProgress,
+		OrderReference:    c.OrderReference,
+		PaymentStatus:     c.PaymentStatus,
+	}
+}
+
+// FromCartState merges a protobuf CartState into an existing CartGrain.
+// This is optional and primarily useful for snapshot import or testing.
+func FromCartState(cs *messages.CartState, g *CartGrain) *CartGrain {
+	if cs == nil {
+		return g
+	}
+	if g == nil {
+		g = &CartGrain{}
+	}
+	g.Id = ToCartId(cs.CartId)
+	g.TotalPrice = cs.TotalPrice
+	g.TotalTax = cs.TotalTax
+	g.TotalDiscount = cs.TotalDiscount
+	g.PaymentInProgress = cs.PaymentInProgress
+	g.OrderReference = cs.OrderReference
+	g.PaymentStatus = cs.PaymentStatus
+
+	// Items
+	g.Items = g.Items[:0]
+	for _, it := range cs.Items {
+		if it == nil {
+			continue
+		}
+		outlet := toPtr(it.Outlet)
+		storeId := toPtr(it.StoreId)
+		g.Items = append(g.Items, &CartItem{
+			Id:          int(it.Id),
+			ItemId:      int(it.SourceItemId),
+			Sku:         it.Sku,
+			Name:        it.Name,
+			Price:       it.UnitPrice,
+			Quantity:    int(it.Quantity),
+			TotalPrice:  it.TotalPrice,
+			TotalTax:    it.TotalTax,
+			OrgPrice:    it.OrgPrice,
+			TaxRate:     int(it.TaxRate),
+			Brand:       it.Brand,
+			Category:    it.Category,
+			Category2:   it.Category2,
+			Category3:   it.Category3,
+			Category4:   it.Category4,
+			Category5:   it.Category5,
+			Image:       it.Image,
+			ArticleType: it.ArticleType,
+			SellerId:    it.SellerId,
+			SellerName:  it.SellerName,
+			Disclaimer:  it.Disclaimer,
+			Outlet:      outlet,
+			StoreId:     storeId,
+			Stock:       StockStatus(it.Stock),
+			// Tax, TaxRate already set via Price / Totals if needed
+		})
+		if it.Id > int64(g.lastItemId) {
+			g.lastItemId = int(it.Id)
+		}
+	}
+
+	// Deliveries
+	g.Deliveries = g.Deliveries[:0]
+	for _, d := range cs.Deliveries {
+		if d == nil {
+			continue
+		}
+		intIds := make([]int, 0, len(d.ItemIds))
+		for _, id := range d.ItemIds {
+			intIds = append(intIds, int(id))
+		}
+		var pp *messages.PickupPoint
+		if d.PickupPoint != nil {
+			pp = &messages.PickupPoint{
+				Id:      d.PickupPoint.Id,
+				Name:    d.PickupPoint.Name,
+				Address: d.PickupPoint.Address,
+				City:    d.PickupPoint.City,
+				Zip:     d.PickupPoint.Zip,
+				Country: d.PickupPoint.Country,
+			}
+		}
+		g.Deliveries = append(g.Deliveries, &CartDelivery{
+			Id:          int(d.Id),
+			Provider:    d.Provider,
+			Price:       d.Price,
+			Items:       intIds,
+			PickupPoint: pp,
+		})
+		if d.Id > int64(g.lastDeliveryId) {
+			g.lastDeliveryId = int(d.Id)
+		}
+	}
+
+	return g
+}
+
+// Helper to safely de-reference optional string pointers to value or "".
+func deref(p *string) string {
+	if p == nil {
+		return ""
+	}
+	return *p
+}
+
+func toPtr(s string) *string {
+	if s == "" {
+		return nil
+	}
+	return &s
+}