set item amount at cart

controllers/cartItemController.go

@@ -337,6 +337,27 @@ func (rc *cartItemController) EditItemHandler(c *gin.Context) {
 
 	action := c.PostForm("action")
 
+	if action == "setAmount" {
+		amountStr := c.PostForm("amount")
+		amount, err := strconv.Atoi(amountStr)
+
+		if err != nil {
+			c.HTML(http.StatusBadRequest, "error.html", gin.H{"error": err})
+			return
+		}
+
+		if amount < 0 {
+			c.HTML(http.StatusBadRequest, "error.html", gin.H{"error": "amount cant be negative"})
+			return
+		}
+		if amount > 500 {
+			c.HTML(http.StatusBadRequest, "error.html", gin.H{"error": "amount cant be over 500"})
+			return
+		}
+
+		cartItem.Quantity = amount
+	}
+
 	if action == "increase" {
 		cartItem.Quantity += 1
 	}