Set orderDate to orderDateInput

Reviewed-on: #3

.dockerignore

@@ -0,0 +1,5 @@
+node_modules
+.git
+.gitignore
+.gitattributes
+README.md

DELIVER_MAN.slnx

@@ -1,6 +0,0 @@
-<Solution>
-  <Project Path="DELIVER_MAN.esproj">
-    <Build />
-    <Deploy />
-  </Project>
-</Solution>

README.md

@@ -1 +1,24 @@
 # DELIVER_MAN
+
+## Core Functionality
+
+- View product inventory with current stock levels.
+- Create orders with customer name and order date.
+- Edit order details (customer name, date) and delete orders.
+- Add items to orders, update item quantities or products, and remove items.
+- Move items between orders.
+- Prevent overselling by validating stock on add/update.
+
+## Run via Docker
+
+Run client + server + database:
+
+```bash
+docker compose up --build
+```
+
+Open the client at `http://localhost:8080`.
+
+Notes:
+- The API is proxied through the client container to the server at `/api`.
+- The MariaDB schema/data is auto-initialized from `docker/init.sql` on first run.

docker-compose.yml

@@ -0,0 +1,60 @@
+services:
+  db:
+    image: mariadb:11.4
+    environment:
+      MARIADB_DATABASE: delivery
+      MARIADB_USER: app
+      MARIADB_PASSWORD: app
+      MARIADB_ROOT_PASSWORD: root
+    volumes:
+      - db_data:/var/lib/mysql
+      - ./docker/init.sql:/docker-entrypoint-initdb.d/init.sql:ro
+    networks:
+      - backend
+    healthcheck:
+      test: ["CMD", "mariadb-admin", "ping", "-h", "localhost", "-u", "root", "-proot"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  server:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.server
+    environment:
+      HOST: db
+      PORT: 3306
+      DATABASE: delivery
+      USER: app
+      PASSWORD: app
+    depends_on:
+      db:
+        condition: service_healthy
+    networks:
+      - backend
+      - frontend
+    healthcheck:
+      test: ["CMD", "node", "-e", "fetch('http://localhost:3000/api/current-date').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  client:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.client
+    depends_on:
+      server:
+        condition: service_healthy
+    ports:
+      - "8080:80"
+    networks:
+      - frontend
+
+volumes:
+  db_data:
+
+networks:
+  backend:
+    internal: true
+  frontend:

docker/Dockerfile.client

@@ -0,0 +1,4 @@
+FROM nginx:1.27-alpine
+
+COPY docker/nginx.conf /etc/nginx/conf.d/default.conf
+COPY public /usr/share/nginx/html

docker/Dockerfile.server

@@ -0,0 +1,13 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY server ./server
+
+ENV NODE_ENV=production
+EXPOSE 3000
+
+CMD ["npm", "start"]

docker/init.sql

@@ -0,0 +1,105 @@
+/*M!999999\- enable the sandbox mode */
+-- MariaDB dump 10.19-11.7.2-MariaDB, for Win64 (AMD64)
+--
+-- Host: localhost    Database: delivery
+-- ------------------------------------------------------
+-- Server version	12.1.2-MariaDB
+
+/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
+/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
+/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
+/*!40101 SET NAMES utf8mb4 */;
+/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
+/*!40103 SET TIME_ZONE='+00:00' */;
+/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
+/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
+/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
+/*M!100616 SET @OLD_NOTE_VERBOSITY=@@NOTE_VERBOSITY, NOTE_VERBOSITY=0 */;
+
+--
+-- Table structure for table `order_items`
+--
+
+DROP TABLE IF EXISTS `order_items`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8mb4 */;
+CREATE TABLE `order_items` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `order_id` varchar(256) DEFAULT NULL,
+  `product_id` varchar(256) DEFAULT NULL,
+  `quantity` int(11) DEFAULT NULL,
+  PRIMARY KEY (`id`),
+  KEY `order_items_orders_FK` (`order_id`),
+  KEY `order_items_products_FK` (`product_id`),
+  CONSTRAINT `order_items_orders_FK` FOREIGN KEY (`order_id`) REFERENCES `orders` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
+  CONSTRAINT `order_items_products_FK` FOREIGN KEY (`product_id`) REFERENCES `products` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+--
+-- Dumping data for table `order_items`
+--
+
+LOCK TABLES `order_items` WRITE;
+/*!40000 ALTER TABLE `order_items` DISABLE KEYS */;
+/*!40000 ALTER TABLE `order_items` ENABLE KEYS */;
+UNLOCK TABLES;
+
+--
+-- Table structure for table `orders`
+--
+
+DROP TABLE IF EXISTS `orders`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8mb4 */;
+CREATE TABLE `orders` (
+  `id` varchar(256) NOT NULL,
+  `customer_name` varchar(256) DEFAULT NULL,
+  `order_date` date DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+--
+-- Table structure for table `products`
+--
+
+DROP TABLE IF EXISTS `products`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8mb4 */;
+CREATE TABLE `products` (
+  `id` varchar(256) NOT NULL,
+  `name` varchar(256) NOT NULL,
+  `quantity` int(11) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+--
+-- Dumping data for table `products`
+--
+
+LOCK TABLES `products` WRITE;
+/*!40000 ALTER TABLE `products` DISABLE KEYS */;
+INSERT INTO `products` VALUES
+('QH-1','Отвёртки',30),
+('QH-3','Гайки',13),
+('QW-1','Молоток',32),
+('QW-2','Гвозди',65);
+/*!40000 ALTER TABLE `products` ENABLE KEYS */;
+UNLOCK TABLES;
+
+--
+-- Dumping routines for database 'delivery'
+--
+/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
+
+/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
+/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
+/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
+/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
+/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
+/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
+/*M!100616 SET NOTE_VERBOSITY=@OLD_NOTE_VERBOSITY */;
+
+-- Dump completed on 2026-01-03 18:57:33

docker/nginx.conf

@@ -0,0 +1,19 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /api/ {
+        proxy_pass http://server:3000;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

public/app.js

@@ -121,7 +121,7 @@ class OrderCard {
         idCell.textContent = item.product_id ?? item.id;
 
         const productCell = document.createElement('td');
-        const productSelect = this.buildProductSelect(item);
+        const productSelect = this.buildProductSelect(item.product_id);
         productSelect.classList.add('form-select-sm');
         productSelect.dataset.action = 'item-product';
         productSelect.dataset.itemId = item.id;
@@ -220,7 +220,12 @@ class OrderCard {
         const productLabel = document.createElement('label');
         productLabel.className = 'form-label';
         productLabel.textContent = 'Товар';
-        const productSelect = this.buildProductSelect();
+        const usedProductIds = new Set(
+            (this.order.items || [])
+                .map((item) => item.product_id)
+                .filter((value) => value !== null && value !== undefined)
+        );
+        const productSelect = this.buildProductSelect(undefined, usedProductIds);
         const productSelectId = `add-item-product-${this.order.id}`;
         productSelect.name = 'productId';
         productSelect.id = productSelectId;
@@ -253,6 +258,16 @@ class OrderCard {
         addButton.textContent = 'Добавить позицию';
         actionCol.appendChild(addButton);
 
+        if (productSelect.options.length === 0) {
+            const placeholder = document.createElement('option');
+            placeholder.value = '';
+            placeholder.textContent = 'Нет доступных позиций';
+            productSelect.appendChild(placeholder);
+            productSelect.disabled = true;
+            quantityInput.disabled = true;
+            addButton.disabled = true;
+        }
+
         form.appendChild(productCol);
         form.appendChild(quantityCol);
         form.appendChild(actionCol);
@@ -260,10 +275,13 @@ class OrderCard {
         return form;
     }
 
-    buildProductSelect(selectedId) {
+    buildProductSelect(selectedId, excludedIds) {
         const select = document.createElement('select');
         select.className = 'form-select';
         this.products.forEach((product) => {
+            if (excludedIds && excludedIds.has(product.id)) {
+                return;
+            }
             const option = document.createElement('option');
             option.value = product.id;
             option.textContent = product.name;
@@ -313,7 +331,7 @@ async function fetchJson(url, options) {
         const payload = await response.json().catch(() => ({
             message: 'Ошибка запроса.'
         }));
-        throw new Error(payload.message || 'Ошибка запроса.');
+        throw new Error(payload.error || payload.message || 'Error');
     }
     if (response.status === 204) {
         return null;
@@ -397,9 +415,7 @@ async function refreshData() {
 
     currentDateEl.textContent = currentDate;
     orderDateInput.min = currentDate;
-    if (!orderDateInput.value) {
+    orderDateInput.value = currentDate
-        orderDateInput.value = currentDate;
-    }
 
     renderInventory();
     renderOrders();
@@ -426,9 +442,7 @@ function initializeApp() {
     currentDate = initialDate;
     currentDateEl.textContent = initialDate;
     orderDateInput.min = initialDate;
-    if (!orderDateInput.value) {
+    orderDateInput.value = initialDate;
-        orderDateInput.value = initialDate;
-    }
 
     orderForm.addEventListener('submit', async (event) => {
         event.preventDefault();
@@ -549,18 +563,24 @@ function initializeApp() {
                         `[data-action="item-product"][data-item-id="${itemId}"]`
                     );
 
-                    await fetchJson(`/api/orders/${orderId}/items/${itemId}`, {
+                    try {
-                        method: 'PUT',
+                        await fetchJson(`/api/orders/${orderId}/items/${itemId}`, {
-                        headers: {
+                            method: 'PUT',
-                            'Content-Type': 'application/json'
+                            headers: {
-                        },
+                                'Content-Type': 'application/json'
-                        body: JSON.stringify({
+                            },
-                            productId: productSelect.value,
+                            body: JSON.stringify({
-                            quantity: Number.parseInt(quantityInput.value, 10)
+                                productId: productSelect.value,
-                        })
+                                quantity: Number.parseInt(quantityInput.value, 10)
-                    });
+                            })
-                    await refreshData();
+                        });
-                    return;
+                        await refreshData();
+                        return;
+                    } catch (error) {
+                        showNotification(error.message, 'warning');
+                        await refreshData();
+                        return;
+                    }
                 }
                 case 'delete-item': {
                     await fetchJson(`/api/orders/${orderId}/items/${itemId}`, {

server/db/database.js

@@ -135,14 +135,14 @@ export default class DBAdapter {
         if (!id || !customer_name || !orderDate){
             return Promise.reject({
                 type: DB_USER_ERROR,
-                error: new Error("Empty in customer name or order date")
+                error: new Error("Пустое имя клиента или дата заказа")
             });
         }
         const currentDate = await getCurrentDate();
         if (orderDate < currentDate){
             return Promise.reject({
                 type: DB_USER_ERROR,
-                error: new Error("Invalid order date")
+                error: new Error("Недопустимая дата заказа")
             });
         }
         try {
@@ -152,7 +152,7 @@ export default class DBAdapter {
         } catch(err){
             return Promise.reject({
                 type: DB_INTERNAL_ERROR,
-                error: new Error("Server error")
+                error: new Error("Ошибка сервера")
             });
         }
     }
@@ -192,8 +192,8 @@ export default class DBAdapter {
         if (!id || !customer_name || !orderDate) {
             return Promise.reject({
                 type: DB_USER_ERROR,
-                error: new Error("Order ID, name or date is required!"),
+                error: new Error("Нужен ID заказа, имя и дата"),
-                message: "Order ID, name or date is required!" // Добавляем message напрямую
+                message: "Нужен ID заказа, имя и дата" // Добавляем message напрямую
             });
         }
 
@@ -201,8 +201,8 @@ export default class DBAdapter {
         if (orderDate < currentDate) {
             return Promise.reject({
                 type: DB_USER_ERROR,
-                error: new Error("Order date cannot be less than current date"),
+                error: new Error("Дата заказа не может быть раньше текущей"),
-                message: "Order date cannot be less than current date"
+                message: "Дата заказа не может быть раньше текущей"
             });
         }
 
@@ -212,8 +212,8 @@ export default class DBAdapter {
             if (!order || order.length === 0) { // Исправлено: проверяем length
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Order not found"),
+                    error: new Error("Заказ не найден"),
-                    message: "Order not found"
+                    message: "Заказ не найден"
                 });
             }
             
@@ -228,8 +228,8 @@ export default class DBAdapter {
             console.error('Database error in changeOrderInfo:', err);
             return Promise.reject({
                 type: DB_INTERNAL_ERROR,
-                error: new Error("Server error"),
+                error: new Error("Ошибка сервера"),
-                message: err.message || "Database operation failed",
+                message: err.message || "Ошибка операции с базой данных",
                 details: err.message
             });
         }
@@ -279,7 +279,7 @@ export default class DBAdapter {
             
             return Promise.reject({
                 type: DB_INTERNAL_ERROR,
-                error: new Error("Failed to delete order"),
+                error: new Error("Не удалось удалить заказ"),
                 details: err.message
             });
         }
@@ -303,7 +303,7 @@ export default class DBAdapter {
                 connection.release();
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Order not found")
+                    error: new Error("Заказ не найден")
                 });
             }
             
@@ -319,7 +319,7 @@ export default class DBAdapter {
                 connection.release();
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Product not found")
+                    error: new Error("Товар не найден")
                 });
             }
             
@@ -328,7 +328,7 @@ export default class DBAdapter {
                 connection.release();
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Insufficient product quantity")
+                    error: new Error("Недостаточно товара на складе")
                 });
             }
 
@@ -361,16 +361,16 @@ export default class DBAdapter {
             console.error('Transaction error:', err);
             
             let errorType = DB_INTERNAL_ERROR;
-            let userMessage = "Database operation failed";
+            let userMessage = "Ошибка операции с базой данных";
             let retryable = false;
             
             if (err.code === 'ER_LOCK_WAIT_TIMEOUT' || err.errno === 1205) {
                 errorType = 'DB_CONFLICT';
-                userMessage = "System is busy. Please try again in a moment.";
+                userMessage = "Система занята. Попробуйте позже.";
                 retryable = true;
             } else if (err.code === 'ER_DUP_ENTRY') {
                 errorType = DB_USER_ERROR;
-                userMessage = "Item already exists in the order";
+                userMessage = "Позиция уже есть в заказе";
             }
             
             return Promise.reject({
@@ -384,10 +384,17 @@ export default class DBAdapter {
         }
     }
 
-    async updateOrderItem({ itemId, quantity }) {
+    async updateOrderItem({ itemId, quantity, productId }) {
         let connection;
         
         try {
+            if (!itemId || !Number.isFinite(quantity) || quantity <= 0) {
+                return Promise.reject({
+                    type: DB_USER_ERROR,
+                    error: new Error("Неверная позиция или количество")
+                });
+            }
+
             connection = await this.#pool.getConnection();
             await connection.beginTransaction();
             
@@ -402,10 +409,55 @@ export default class DBAdapter {
                 connection.release();
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Order item not found")
+                    error: new Error("Позиция заказа не найдена")
                 });
             }
 
+            const targetProductId = productId ?? itemRow.product_id;
+
+            if (targetProductId !== itemRow.product_id) {
+                const newProduct = await connection.query(
+                    'SELECT quantity FROM products WHERE id = ? FOR UPDATE',
+                    [targetProductId]
+                );
+                const newProductRow = newProduct?.[0];
+                if (!newProductRow) {
+                    await connection.rollback();
+                    connection.release();
+                    return Promise.reject({
+                        type: DB_USER_ERROR,
+                        error: new Error("Товар не найден")
+                    });
+                }
+                if (newProductRow.quantity < quantity) {
+                    await connection.rollback();
+                    connection.release();
+                    return Promise.reject({
+                        type: DB_USER_ERROR,
+                        error: new Error("Недостаточно товара на складе")
+                    });
+                }
+
+                await connection.query(
+                    'UPDATE products SET quantity = quantity + ? WHERE id = ?',
+                    [itemRow.quantity, itemRow.product_id]
+                );
+
+                await connection.query(
+                    'UPDATE products SET quantity = quantity - ? WHERE id = ?',
+                    [quantity, targetProductId]
+                );
+
+                await connection.query(
+                    'UPDATE order_items SET product_id = ?, quantity = ? WHERE id = ?',
+                    [targetProductId, quantity, itemId]
+                );
+
+                await connection.commit();
+                connection.release();
+                return;
+            }
+
             const diff = quantity - itemRow.quantity;
 
             if (diff > 0) {
@@ -420,7 +472,7 @@ export default class DBAdapter {
                     connection.release();
                     return Promise.reject({
                         type: DB_USER_ERROR,
-                        error: new Error("Insufficient product quantity")
+                        error: new Error("Недостаточно товара на складе")
                     });
                 }
                 
@@ -457,7 +509,7 @@ export default class DBAdapter {
             
             return Promise.reject({
                 type: DB_INTERNAL_ERROR,
-                error: new Error("Failed to update order item"),
+                error: new Error("Не удалось обновить позицию заказа"),
                 details: err.message
             });
         }
@@ -481,7 +533,7 @@ export default class DBAdapter {
                 connection.release();
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Order item not found")
+                    error: new Error("Позиция заказа не найдена")
                 });
             }
 
@@ -512,7 +564,7 @@ export default class DBAdapter {
             
             return Promise.reject({
                 type: DB_INTERNAL_ERROR,
-                error: new Error("Failed to delete order item"),
+                error: new Error("Не удалось удалить позицию заказа"),
                 details: err.message,
                 itemId: itemId
             });
@@ -537,12 +589,12 @@ export default class DBAdapter {
                 connection.release();
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Target order not found")
+                    error: new Error("Целевой заказ не найден")
                 });
             }
             
             const item = await connection.query(
-                'SELECT id, order_id FROM order_items WHERE id = ? FOR UPDATE', 
+                'SELECT id, order_id, product_id, quantity FROM order_items WHERE id = ? FOR UPDATE', 
                 [itemId]
             );
 
@@ -552,15 +604,39 @@ export default class DBAdapter {
                 connection.release();
                 return Promise.reject({
                     type: DB_USER_ERROR,
-                    error: new Error("Order item not found")
+                    error: new Error("Позиция заказа не найдена")
                 });
             }
 
-            await connection.query(
+            if (itemRow.order_id === targetOrderId) {
-                'UPDATE order_items SET order_id = ? WHERE id = ?',
+                await connection.rollback();
-                [targetOrderId, itemId]
+                connection.release();
+                return;
+            }
+
+            const targetItem = await connection.query(
+                'SELECT id, quantity FROM order_items WHERE order_id = ? AND product_id = ? FOR UPDATE',
+                [targetOrderId, itemRow.product_id]
             );
 
+            const targetItemRow = targetItem?.[0];
+
+            if (targetItemRow) {
+                await connection.query(
+                    'UPDATE order_items SET quantity = ? WHERE id = ?',
+                    [targetItemRow.quantity + itemRow.quantity, targetItemRow.id]
+                );
+                await connection.query(
+                    'DELETE FROM order_items WHERE id = ?',
+                    [itemId]
+                );
+            } else {
+                await connection.query(
+                    'UPDATE order_items SET order_id = ? WHERE id = ?',
+                    [targetOrderId, itemId]
+                );
+            }
+
             await connection.commit();
             connection.release();
             
@@ -576,7 +652,7 @@ export default class DBAdapter {
             
             return Promise.reject({
                 type: DB_INTERNAL_ERROR,
-                error: new Error("Failed to move order item"),
+                error: new Error("Не удалось перенести позицию заказа"),
                 details: err.message
             });
         }

server/docker.env

@@ -0,0 +1,5 @@
+HOST="db"
+PORT=3306
+DATABASE="delivery"
+USER="app"
+PASSWORD="app"

server/server.js

@@ -1,11 +1,12 @@
-import express from "express";
+import express from "express";
 import dotenv from "dotenv"
 import { randomUUID } from "crypto";
 import DBAdapter, { getCurrentDate, setCurrentDate } from "./db/database.js";
 import { DB_INTERNAL_ERROR, DB_USER_ERROR } from "./db/database.js";
 
+// Switch to .env for test in local machine
 dotenv.config({
-    path: './server/.env'
+    path: './server/docker.env'
 });
 
 const {
@@ -23,7 +24,7 @@ app.use(express.json());
 app.use((req, res, next) => {
     res.setHeader('Access-Control-Allow-Origin', '*');
     res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
-    res.setHeader('Access-Control-Allow-Methods', 'GET,POST,PUT,DELETE');
+    res.setHeader('Access-Control-Allow-Methods', 'GET,POST,PUT,DELETE,OPTIONS');
     if (req.method === 'OPTIONS') {
         res.sendStatus(204);
         return;
@@ -174,7 +175,7 @@ app.post('/api/orders', async (req, res) => {
                 res.status(500).json({
                     timeStamp: new Date().toISOString(),
                     statusCode: 500,
-                    message: "Unknown error",
+                    message: "Неизвестная ошибка",
                     error: err.message
                 });        
         }
@@ -189,7 +190,7 @@ app.put('/api/orders/:id', async (req, res) => {
         return res.status(400).json({
             timeStamp: new Date().toISOString(),
             statusCode: 400,
-            error: "Customer name and order date are required"
+            error: "Имя клиента и дата заказа обязательны"
         });
     }
     
@@ -211,7 +212,7 @@ app.put('/api/orders/:id', async (req, res) => {
         
         const errorMessage = err.message || 
                            err.error?.message || 
-                           "Unknown error occurred";
+                           "Произошла неизвестная ошибка";
         
         switch(err.type) {
             case DB_INTERNAL_ERROR:
@@ -219,7 +220,7 @@ app.put('/api/orders/:id', async (req, res) => {
                     timeStamp: new Date().toISOString(),
                     statusCode: 500,
                     error: errorMessage,
-                    details: err.details || "Internal server error"
+                    details: err.details || "Внутренняя ошибка сервера"
                 });
                     
             case DB_USER_ERROR:
@@ -264,7 +265,7 @@ app.post('/api/orders/:orderId/items', async (req, res) => {
         return res.status(400).json({
             timeStamp: new Date().toISOString(),
             statusCode: 400,
-            error: "Invalid productId or quantity"
+            error: "Некорректный товар или количество"
         });
     }
     
@@ -289,21 +290,21 @@ app.post('/api/orders/:orderId/items', async (req, res) => {
             return res.status(400).json({
                 timeStamp: new Date().toISOString(),
                 statusCode: 400,
-                error: err.error?.message || "Invalid request",
+                    error: err.error?.message || "Некорректный запрос",
                 details: err.details
             });
         } else if (err.type === DB_INTERNAL_ERROR) {
             return res.status(500).json({
                 timeStamp: new Date().toISOString(),
                 statusCode: 500,
-                error: "Internal server error",
+                error: "Внутренняя ошибка сервера",
                 details: err.error?.message
             });
         } else {
             return res.status(500).json({
                 timeStamp: new Date().toISOString(),
                 statusCode: 500,
-                error: "Internal server error"
+                error: "Внутренняя ошибка сервера"
             });
         }
     }
@@ -311,24 +312,28 @@ app.post('/api/orders/:orderId/items', async (req, res) => {
 
 app.put('/api/orders/:orderId/items/:itemId', async (req, res) => {
     let itemId = req.params.itemId;
-    let quantity = req.body.quantity;
+    let { quantity, productId } = req.body;
+    quantity = Number.parseInt(quantity, 10);
     
     try {
         await adapter.updateOrderItem({
             itemId, 
+            productId,
             quantity
         });
         
         res.status(201).json({
             itemId, 
+            productId,
             quantity
         });
         
     } catch (err) {
-        res.json({
+        const statusCode = err.type === DB_USER_ERROR ? 400 : 500;
+        res.status(statusCode).json({
             timeStamp: new Date().toISOString(),
-            statusCode: 500,
+            statusCode,
-            error: err.message
+            error: err.error?.message || err.message
         });
     }
 });
@@ -342,14 +347,14 @@ app.delete('/api/orders/:orderId/items/:itemId', async (req, res) => {
             return res.status(500).json({
                 timeStamp: new Date().toISOString(),
                 statusCode: 500,
-                error: "Server error",
+                error: "Ошибка сервера",
                 details: err.error.message
             });
         } else {
             return res.status(500).json({
                 timeStamp: new Date().toISOString(),
                 statusCode: 500,
-                error: "Internal server error",
+                error: "Внутренняя ошибка сервера",
                 details: err.message
             });
         }
@@ -382,7 +387,7 @@ app.post('/api/order-items/:itemId/move', async (req, res) => {
 
 
 app.use((req, res) => {
-    res.status(404).json({ error: 'Invalid route' });
+res.status(404).json({ error: 'Неверный маршрут' });
 });
 
 const server = app.listen(appPort, async() => {