init

internal/entities/inventory.go

@@ -0,0 +1,42 @@
+package entities
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type Inventory struct {
+	ID           uuid.UUID `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
+	OutletID     uuid.UUID `gorm:"type:uuid;not null;index" json:"outlet_id" validate:"required"`
+	ProductID    uuid.UUID `gorm:"type:uuid;not null;index" json:"product_id" validate:"required"`
+	Quantity     int       `gorm:"not null;default:0" json:"quantity" validate:"min=0"`
+	ReorderLevel int       `gorm:"default:0" json:"reorder_level" validate:"min=0"`
+	UpdatedAt    time.Time `gorm:"autoUpdateTime" json:"updated_at"`
+
+	Outlet  Outlet  `gorm:"foreignKey:OutletID" json:"outlet,omitempty"`
+	Product Product `gorm:"foreignKey:ProductID" json:"product,omitempty"`
+}
+
+func (i *Inventory) BeforeCreate(tx *gorm.DB) error {
+	if i.ID == uuid.Nil {
+		i.ID = uuid.New()
+	}
+	return nil
+}
+
+func (Inventory) TableName() string {
+	return "inventory"
+}
+
+func (i *Inventory) IsLowStock() bool {
+	return i.Quantity <= i.ReorderLevel
+}
+
+func (i *Inventory) UpdateQuantity(delta int) {
+	i.Quantity += delta
+	if i.Quantity < 0 {
+		i.Quantity = 0
+	}
+}