feat: add stock movement on backend

backend/database/db.go

@@ -26,5 +26,6 @@ func InitDB() {
 		&models.CartItem{},
 		&models.Order{},
 		&models.OrderItem{},
+		&models.StockMovement{},
 	)
 }

backend/handlers/stock_handler.go

@@ -0,0 +1,116 @@
+package handlers
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+
+	"fishfish/database"
+	"fishfish/models"
+)
+
+func StockIn(c *gin.Context) {
+	var input struct {
+		ItemID   uint    `json:"item_id" binding:"required"`
+		Quantity float64 `json:"quantity" binding:"required"`
+		Comment  string  `json:"comment"`
+	}
+
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Неверные данные"})
+		return
+	}
+
+	if input.Quantity <= 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Количество должно быть положительным"})
+		return
+	}
+
+	err := database.DB.Transaction(func(tx *gorm.DB) error {
+		result := tx.Model(&models.Item{}).
+			Where("id = ? ", input.ItemID).
+			Update("stock", gorm.Expr("stock + ?", input.Quantity))
+
+		if result.Error != nil {
+			return result.Error
+		}
+
+		if result.RowsAffected == 0 {
+			return fmt.Errorf("товар не найден")
+		}
+
+		movement := models.StockMovement{
+			ItemID:   input.ItemID,
+			Type:     "in",
+			Quantity: input.Quantity,
+			Reason:   "purchase",
+			Comment:  input.Comment,
+		}
+
+		if err := tx.Create(&movement).Error; err != nil {
+			return err
+		}
+
+		return nil
+	})
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Приход оформлен"})
+}
+
+func StockOut(c *gin.Context) {
+	var input struct {
+		ItemID   uint    `json:"item_id" binding:"required"`
+		Quantity float64 `json:"quantity" binding:"required"`
+		Comment  string  `json:"comment"`
+	}
+
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Неверные данные"})
+		return
+	}
+
+	if input.Quantity <= 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Количество должно быть положительным"})
+		return
+	}
+
+	err := database.DB.Transaction(func(tx *gorm.DB) error {
+		result := tx.Model(&models.Item{}).
+			Where("id = ? AND stock >= ?  ", input.ItemID, input.Quantity).
+			Update("stock", gorm.Expr("stock - ?", input.Quantity))
+
+		if result.Error != nil {
+			return result.Error
+		}
+
+		if result.RowsAffected == 0 {
+			return fmt.Errorf("товар не найден или не достаточно товара")
+		}
+
+		movement := models.StockMovement{
+			ItemID:   input.ItemID,
+			Type:     "out",
+			Quantity: input.Quantity,
+			Reason:   "sale",
+			Comment:  input.Comment,
+		}
+
+		if err := tx.Create(&movement).Error; err != nil {
+			return err
+		}
+
+		return nil
+	})
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Уход оформлен"})
+}

backend/main.go

@@ -67,6 +67,8 @@ func main() {
 			admin.GET("/orders", handlers.GetAllOrders)
 			admin.PATCH("/orders/:id", handlers.UpdateOrderStatus)
 			admin.PATCH("/items/:id/avatar", handlers.UploadItemAvatar)
+			admin.POST("/stock/in", handlers.StockIn)
+			admin.POST("/stock/out", handlers.StockOut)
 		}
 	}
 

backend/models/stock.go

@@ -0,0 +1,17 @@
+package models
+
+import (
+	"time"
+)
+
+type StockMovement struct {
+	ID        uint    `json:"id" gorm:"primaryKey"`
+	ItemID    uint    `json:"item_id"`
+	Item      Item    `json:"item" gorm:"foreignKey:ItemID"`
+	Type      string  `json:"type"`
+	Quantity  float64 `json:"quantity"`
+	Reason    string  `json:"reason" gorm:"not null"`
+	OrderID   *uint   `json:"order_id"`
+	Comment   string  `json:"comment"`
+	CreatedAt time.Time
+}