initial inventory service

pkg/inventory/memory_service.go

@@ -0,0 +1,47 @@
+package inventory
+
+import (
+	"errors"
+	"sync"
+)
+
+type MemoryInventoryService struct {
+	warehouses map[LocationID]*Warehouse
+	mu         sync.RWMutex
+}
+
+func NewMemoryInventoryService() *MemoryInventoryService {
+	return &MemoryInventoryService{
+		warehouses: make(map[LocationID]*Warehouse),
+	}
+}
+
+func (s *MemoryInventoryService) AddWarehouse(warehouse *Warehouse) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.warehouses[warehouse.ID] = warehouse
+}
+
+func (s *MemoryInventoryService) GetInventory(sku SKU, locationID LocationID) (*InventoryItem, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	warehouse, ok := s.warehouses[locationID]
+	if !ok {
+		return nil, errors.New("warehouse not found")
+	}
+
+	for _, item := range warehouse.Inventory {
+		if item.SKU == sku {
+			return &item, nil
+		}
+	}
+	return nil, errors.New("sku not found in warehouse")
+}
+
+func (s *MemoryInventoryService) ReserveInventory(req ...ReserveRequest) error {
+	// We'll implement the reservation logic using Lua script execution here
+
+	// For now, let's just return an error indicating it's not implemented
+	return errors.New("reservation not implemented yet")
+}