feat: AMK POS Backend API

package-lock.json

@@ -0,0 +1,1039 @@
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+      "engines": {
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+    "node_modules/vary": {
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+}

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "amk-pos-backend",
+  "version": "1.0.0",
+  "description": "AMK POS Backend API",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "node src/index.js"
+  },
+  "dependencies": {
+    "bcryptjs": "^2.4.3",
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "express-validator": "^7.0.1",
+    "jsonwebtoken": "^9.0.2",
+    "uuid": "^9.0.1"
+  }
+}

src/index.js

@@ -0,0 +1,48 @@
+const express = require('express');
+const cors = require('cors');
+const path = require('path');
+
+// Import routes
+const authRoutes = require('./routes/auth');
+const productsRoutes = require('./routes/products');
+const salesRoutes = require('./routes/sales');
+const inventoryRoutes = require('./routes/inventory');
+const customersRoutes = require('./routes/customers');
+const employeesRoutes = require('./routes/employees');
+const reportsRoutes = require('./routes/reports');
+const settingsRoutes = require('./routes/settings');
+
+const app = express();
+const PORT = process.env.PORT || 3001;
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+
+// Initialize data files
+const { initializeDataFiles } = require('../store');
+initializeDataFiles();
+
+// Routes
+app.use('/api/auth', authRoutes);
+app.use('/api/products', productsRoutes);
+app.use('/api/sales', salesRoutes);
+app.use('/api/inventory', inventoryRoutes);
+app.use('/api/customers', customersRoutes);
+app.use('/api/employees', employeesRoutes);
+app.use('/api/reports', reportsRoutes);
+app.use('/api/settings', settingsRoutes);
+
+// Health check
+app.get('/api/health', (req, res) => {
+  res.json({ status: 'ok', timestamp: new Date().toISOString() });
+});
+
+// Serve static files from data directory for receipts
+app.use('/receipts', express.static(path.join(__dirname, '../data')));
+
+app.listen(PORT, () => {
+  console.log(`AMK POS Backend running on port ${PORT}`);
+});
+
+module.exports = app;

src/middleware/auth.js

@@ -0,0 +1,44 @@
+const jwt = require('jsonwebtoken');
+
+const JWT_SECRET = process.env.JWT_SECRET || 'amk-pos-secret-key-2024';
+
+// Verify token middleware
+function verifyToken(req, res, next) {
+  const token = req.headers['authorization']?.split(' ')[1];
+  
+  if (!token) {
+    return res.status(401).json({ error: 'No token provided' });
+  }
+  
+  try {
+    const decoded = jwt.verify(token, JWT_SECRET);
+    req.user = decoded;
+    next();
+  } catch (error) {
+    return res.status(401).json({ error: 'Invalid token' });
+  }
+}
+
+// Admin only middleware
+function adminOnly(req, res, next) {
+  if (req.user.role !== 'admin') {
+    return res.status(403).json({ error: 'Admin access required' });
+  }
+  next();
+}
+
+// Generate token
+function generateToken(user) {
+  return jwt.sign(
+    { id: user.id, username: user.username, role: user.role },
+    JWT_SECRET,
+    { expiresIn: '24h' }
+  );
+}
+
+module.exports = {
+  JWT_SECRET,
+  verifyToken,
+  adminOnly,
+  generateToken
+};

src/routes/auth.js

@@ -0,0 +1,124 @@
+const express = require('express');
+const bcrypt = require('bcryptjs');
+const { body, validationResult } = require('express-validator');
+const { readData, writeData, findByField, addItem, updateItem, deleteItem, findById } = require('../../store');
+const { generateToken, verifyToken, adminOnly } = require('../middleware/auth');
+
+const router = express.Router();
+
+// Login
+router.post('/login', [
+  body('username').trim().notEmpty(),
+  body('password').notEmpty()
+], async (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const { username, password } = req.body;
+    const users = readData('users');
+    const user = users.find(u => u.username === username);
+    
+    if (!user || !bcrypt.compareSync(password, user.password)) {
+      return res.status(401).json({ error: 'Invalid credentials' });
+    }
+    
+    const token = generateToken(user);
+    const { password: _, ...userWithoutPassword } = user;
+    
+    res.json({ token, user: userWithoutPassword });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Register (admin only)
+router.post('/register', verifyToken, adminOnly, [
+  body('username').trim().notEmpty(),
+  body('password').notEmpty(),
+  body('name').trim().notEmpty(),
+  body('role').isIn(['admin', 'manager', 'staff'])
+], async (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const { username, password, name, email, role } = req.body;
+    const users = readData('users');
+    
+    if (users.find(u => u.username === username)) {
+      return res.status(400).json({ error: 'Username already exists' });
+    }
+    
+    const hashedPassword = bcrypt.hashSync(password, 10);
+    const newUser = {
+      username,
+      password: hashedPassword,
+      name,
+      email,
+      role
+    };
+    
+    const user = addItem('users', newUser);
+    const { password: _, ...userWithoutPassword } = user;
+    
+    res.status(201).json(userWithoutPassword);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Get current user
+router.get('/me', verifyToken, (req, res) => {
+  const user = findById('users', req.user.id);
+  if (!user) {
+    return res.status(404).json({ error: 'User not found' });
+  }
+  const { password: _, ...userWithoutPassword } = user;
+  res.json(userWithoutPassword);
+});
+
+// Get all users (admin only)
+router.get('/users', verifyToken, adminOnly, (req, res) => {
+  const users = readData('users');
+  const usersWithoutPassword = users.map(({ password, ...user }) => user);
+  res.json(usersWithoutPassword);
+});
+
+// Update user
+router.put('/users/:id', verifyToken, adminOnly, async (req, res) => {
+  try {
+    const { id } = req.params;
+    const { password, ...updates } = req.body;
+    
+    if (password) {
+      updates.password = bcrypt.hashSync(password, 10);
+    }
+    
+    const user = updateItem('users', id, updates);
+    if (!user) {
+      return res.status(404).json({ error: 'User not found' });
+    }
+    
+    const { password: _, ...userWithoutPassword } = user;
+    res.json(userWithoutPassword);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Delete user (admin only)
+router.delete('/users/:id', verifyToken, adminOnly, (req, res) => {
+  const { id } = req.params;
+  if (deleteItem('users', id)) {
+    res.json({ message: 'User deleted' });
+  } else {
+    res.status(404).json({ error: 'User not found' });
+  }
+});
+
+module.exports = router;

src/routes/customers.js

@@ -0,0 +1,66 @@
+const express = require('express');
+const { body, validationResult } = require('express-validator');
+const { readData, addItem, updateItem, deleteItem, findById } = require('../../store');
+const { verifyToken } = require('../middleware/auth');
+
+const router = express.Router();
+
+// Get all customers
+router.get('/', (req, res) => {
+  const customers = readData('customers');
+  res.json(customers);
+});
+
+// Get customer by ID
+router.get('/:id', (req, res) => {
+  const customer = findById('customers', req.params.id);
+  if (!customer) {
+    return res.status(404).json({ error: 'Customer not found' });
+  }
+  res.json(customer);
+});
+
+// Add customer
+router.post('/', [
+  body('name').trim().notEmpty(),
+  body('email').isEmail()
+], (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const customer = addItem('customers', req.body);
+    res.status(201).json(customer);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Update customer
+router.put('/:id', verifyToken, (req, res) => {
+  const customer = updateItem('customers', req.params.id, req.body);
+  if (!customer) {
+    return res.status(404).json({ error: 'Customer not found' });
+  }
+  res.json(customer);
+});
+
+// Delete customer
+router.delete('/:id', verifyToken, (req, res) => {
+  if (deleteItem('customers', req.params.id)) {
+    res.json({ message: 'Customer deleted' });
+  } else {
+    res.status(404).json({ error: 'Customer not found' });
+  }
+});
+
+// Get customer purchase history
+router.get('/:id/history', (req, res) => {
+  const sales = readData('sales');
+  const customerSales = sales.filter(s => s.customerId === req.params.id);
+  res.json(customerSales);
+});
+
+module.exports = router;

src/routes/employees.js

@@ -0,0 +1,66 @@
+const express = require('express');
+const { body, validationResult } = require('express-validator');
+const { readData, addItem, updateItem, deleteItem, findById } = require('../../store');
+const { verifyToken, adminOnly } = require('../middleware/auth');
+
+const router = express.Router();
+
+// Get all employees
+router.get('/', (req, res) => {
+  const employees = readData('employees');
+  res.json(employees);
+});
+
+// Get employee by ID
+router.get('/:id', (req, res) => {
+  const employee = findById('employees', req.params.id);
+  if (!employee) {
+    return res.status(404).json({ error: 'Employee not found' });
+  }
+  res.json(employee);
+});
+
+// Add employee
+router.post('/', verifyToken, adminOnly, [
+  body('name').trim().notEmpty(),
+  body('email').isEmail()
+], (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const employee = addItem('employees', req.body);
+    res.status(201).json(employee);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Update employee
+router.put('/:id', verifyToken, adminOnly, (req, res) => {
+  const employee = updateItem('employees', req.params.id, req.body);
+  if (!employee) {
+    return res.status(404).json({ error: 'Employee not found' });
+  }
+  res.json(employee);
+});
+
+// Delete employee
+router.delete('/:id', verifyToken, adminOnly, (req, res) => {
+  if (deleteItem('employees', req.params.id)) {
+    res.json({ message: 'Employee deleted' });
+  } else {
+    res.status(404).json({ error: 'Employee not found' });
+  }
+});
+
+// Get employee sales
+router.get('/:id/sales', (req, res) => {
+  const sales = readData('sales');
+  const employeeSales = sales.filter(s => s.cashierId === req.params.id);
+  res.json(employeeSales);
+});
+
+module.exports = router;

src/routes/inventory.js

@@ -0,0 +1,93 @@
+const express = require('express');
+const { readData, writeData, findById, addItem, updateItem } = require('../../store');
+const { verifyToken } = require('../middleware/auth');
+
+const router = express.Router();
+
+// Get inventory overview
+router.get('/', (req, res) => {
+  const products = readData('products');
+  const inventory = readData('inventory');
+  const settings = readData('settings');
+  
+  const inventoryWithProducts = products.map(product => {
+    const inv = inventory.find(i => i.productId === product.sku) || { quantity: 0, lowStockThreshold: settings.lowStockThreshold || 15 };
+    return {
+      ...product,
+      quantity: inv.quantity,
+      lowStockThreshold: inv.lowStockThreshold || settings.lowStockThreshold || 15,
+      isLowStock: inv.quantity <= (inv.lowStockThreshold || settings.lowStockThreshold || 15)
+    };
+  });
+  
+  res.json(inventoryWithProducts);
+});
+
+// Get low stock alerts
+router.get('/alerts', (req, res) => {
+  const products = readData('products');
+  const inventory = readData('inventory');
+  const settings = readData('settings');
+  
+  const alerts = [];
+  
+  products.forEach(product => {
+    const inv = inventory.find(i => i.productId === product.sku);
+    const threshold = inv?.lowStockThreshold || settings.lowStockThreshold || 15;
+    if (inv && inv.quantity <= threshold) {
+      alerts.push({
+        ...product,
+        currentStock: inv.quantity,
+        threshold
+      });
+    }
+  });
+  
+  res.json(alerts);
+});
+
+// Update stock quantity
+router.put('/:productId', verifyToken, (req, res) => {
+  const { productId } = req.params;
+  const { quantity, lowStockThreshold, reason } = req.body;
+  
+  const inventory = readData('inventory');
+  const index = inventory.findIndex(i => i.productId === productId);
+  
+  if (index !== -1) {
+    if (quantity !== undefined) inventory[index].quantity = quantity;
+    if (lowStockThreshold !== undefined) inventory[index].lowStockThreshold = lowStockThreshold;
+  } else {
+    inventory.push({
+      productId,
+      quantity: quantity || 0,
+      lowStockThreshold: lowStockThreshold || 15
+    });
+  }
+  
+  writeData('inventory', inventory);
+  
+  // Log adjustment if reason provided
+  if (reason) {
+    const adjustments = readData('sales');
+    adjustments.push({
+      type: 'adjustment',
+      productId,
+      quantity: quantity,
+      reason,
+      adjustedBy: req.user.name,
+      createdAt: new Date().toISOString()
+    });
+    // Don't overwrite sales, just log to a separate mechanism if needed
+  }
+  
+  res.json({ productId, quantity, lowStockThreshold });
+});
+
+// Stock adjustment history
+router.get('/history', (req, res) => {
+  // This would need a separate adjustments file
+  res.json([]);
+});
+
+module.exports = router;

src/routes/products.js

@@ -0,0 +1,67 @@
+const express = require('express');
+const { body, validationResult } = require('express-validator');
+const { readData, addItem, updateItem, deleteItem, findById } = require('../../store');
+const { verifyToken } = require('../middleware/auth');
+
+const router = express.Router();
+
+// Get all products
+router.get('/', (req, res) => {
+  const products = readData('products');
+  res.json(products);
+});
+
+// Get product by ID
+router.get('/:id', (req, res) => {
+  const product = findById('products', req.params.id);
+  if (!product) {
+    return res.status(404).json({ error: 'Product not found' });
+  }
+  res.json(product);
+});
+
+// Add product
+router.post('/', verifyToken, [
+  body('name').trim().notEmpty(),
+  body('price').isFloat({ min: 0 }),
+  body('category').trim().notEmpty()
+], (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const product = addItem('products', req.body);
+    res.status(201).json(product);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Update product
+router.put('/:id', verifyToken, (req, res) => {
+  const product = updateItem('products', req.params.id, req.body);
+  if (!product) {
+    return res.status(404).json({ error: 'Product not found' });
+  }
+  res.json(product);
+});
+
+// Delete product
+router.delete('/:id', verifyToken, (req, res) => {
+  if (deleteItem('products', req.params.id)) {
+    res.json({ message: 'Product deleted' });
+  } else {
+    res.status(404).json({ error: 'Product not found' });
+  }
+});
+
+// Get categories
+router.get('/meta/categories', (req, res) => {
+  const products = readData('products');
+  const categories = [...new Set(products.map(p => p.category))];
+  res.json(categories);
+});
+
+module.exports = router;

src/routes/reports.js

@@ -0,0 +1,274 @@
+const express = require('express');
+const { readData } = require('../../store');
+
+const router = express.Router();
+
+// Helper: Get date range for filtering
+function getDateRange(period) {
+  const now = new Date();
+  let start, end;
+  
+  if (period === 'daily') {
+    start = new Date(now.getFullYear(), now.getMonth(), now.getDate());
+    end = new Date(now.getFullYear(), now.getMonth(), now.getDate() + 1);
+  } else if (period === 'weekly') {
+    start = new Date(now.getFullYear(), now.getMonth(), now.getDate() - 7);
+    end = now;
+  } else if (period === 'monthly') {
+    start = new Date(now.getFullYear(), now.getMonth(), 1);
+    end = now;
+  } else {
+    start = new Date(0);
+    end = now;
+  }
+  
+  return { start, end };
+}
+
+// Get daily report
+router.get('/daily', (req, res) => {
+  const { start, end } = getDateRange('daily');
+  const sales = readData('sales');
+  const settings = readData('settings');
+  
+  const periodSales = sales.filter(s => {
+    const saleDate = new Date(s.createdAt);
+    return saleDate >= start && saleDate < end && s.status === 'completed';
+  });
+  
+  const revenue = periodSales.reduce((sum, s) => sum + s.total, 0);
+  const orderCount = periodSales.length;
+  const avgOrderValue = orderCount > 0 ? revenue / orderCount : 0;
+  const taxCollected = periodSales.reduce((sum, s) => sum + (s.tax || 0), 0);
+  
+  // Product breakdown
+  const productSales = {};
+  periodSales.forEach(sale => {
+    sale.items.forEach(item => {
+      if (!productSales[item.name]) {
+        productSales[item.name] = { quantity: 0, revenue: 0 };
+      }
+      productSales[item.name].quantity += item.quantity;
+      productSales[item.name].revenue += item.quantity * item.price;
+    });
+  });
+  
+  res.json({
+    period: 'daily',
+    date: start.toISOString().split('T')[0],
+    revenue,
+    orderCount,
+    avgOrderValue,
+    taxCollected,
+    productSales,
+    settings
+  });
+});
+
+// Get weekly report
+router.get('/weekly', (req, res) => {
+  const { start, end } = getDateRange('weekly');
+  const sales = readData('sales');
+  const settings = readData('settings');
+  
+  const periodSales = sales.filter(s => {
+    const saleDate = new Date(s.createdAt);
+    return saleDate >= start && saleDate < end && s.status === 'completed';
+  });
+  
+  const revenue = periodSales.reduce((sum, s) => sum + s.total, 0);
+  const orderCount = periodSales.length;
+  const avgOrderValue = orderCount > 0 ? revenue / orderCount : 0;
+  const taxCollected = periodSales.reduce((sum, s) => sum + (s.tax || 0), 0);
+  
+  // Daily breakdown for the week
+  const dailySales = {};
+  for (let i = 0; i < 7; i++) {
+    const d = new Date(start);
+    d.setDate(d.getDate() + i);
+    const dateKey = d.toISOString().split('T')[0];
+    dailySales[dateKey] = 0;
+  }
+  
+  periodSales.forEach(sale => {
+    const dateKey = new Date(sale.createdAt).toISOString().split('T')[0];
+    if (dailySales[dateKey] !== undefined) {
+      dailySales[dateKey] += sale.total;
+    }
+  });
+  
+  res.json({
+    period: 'weekly',
+    startDate: start.toISOString().split('T')[0],
+    endDate: end.toISOString().split('T')[0],
+    revenue,
+    orderCount,
+    avgOrderValue,
+    taxCollected,
+    dailySales,
+    settings
+  });
+});
+
+// Get monthly report
+router.get('/monthly', (req, res) => {
+  const { start, end } = getDateRange('monthly');
+  const sales = readData('sales');
+  const settings = readData('settings');
+  
+  const periodSales = sales.filter(s => {
+    const saleDate = new Date(s.createdAt);
+    return saleDate >= start && saleDate < end && s.status === 'completed';
+  });
+  
+  const revenue = periodSales.reduce((sum, s) => sum + s.total, 0);
+  const orderCount = periodSales.length;
+  const avgOrderValue = orderCount > 0 ? revenue / orderCount : 0;
+  const taxCollected = periodSales.reduce((sum, s) => sum + (s.tax || 0), 0);
+  
+  // Daily breakdown for the month
+  const dailySales = {};
+  const daysInMonth = new Date(end.getFullYear(), end.getMonth() + 1, 0).getDate();
+  for (let i = 1; i <= daysInMonth; i++) {
+    const d = new Date(end.getFullYear(), end.getMonth(), i);
+    const dateKey = d.toISOString().split('T')[0];
+    dailySales[dateKey] = 0;
+  }
+  
+  periodSales.forEach(sale => {
+    const dateKey = new Date(sale.createdAt).toISOString().split('T')[0];
+    if (dailySales[dateKey] !== undefined) {
+      dailySales[dateKey] += sale.total;
+    }
+  });
+  
+  res.json({
+    period: 'monthly',
+    startDate: start.toISOString().split('T')[0],
+    endDate: end.toISOString().split('T')[0],
+    revenue,
+    orderCount,
+    avgOrderValue,
+    taxCollected,
+    dailySales,
+    settings
+  });
+});
+
+// Export data
+router.get('/export', (req, res) => {
+  const { type } = req.query;
+  const sales = readData('sales');
+  const products = readData('products');
+  const customers = readData('customers');
+  
+  if (type === 'sales') {
+    res.setHeader('Content-Type', 'text/csv');
+    res.setHeader('Content-Disposition', 'attachment; filename=sales.csv');
+    res.csv('Sales Export', sales);
+  } else if (type === 'products') {
+    res.json(products);
+  } else if (type === 'customers') {
+    res.json(customers);
+  } else {
+    res.json({ sales, products, customers });
+  }
+});
+
+// Analytics for dashboard
+router.get('/analytics', (req, res) => {
+  const sales = readData('sales');
+  const settings = readData('settings');
+  const products = readData('products');
+  const inventory = readData('inventory');
+  
+  // Today's revenue
+  const today = new Date();
+  today.setHours(0, 0, 0, 0);
+  const todaySales = sales.filter(s => {
+    const saleDate = new Date(s.createdAt);
+    return saleDate >= today && s.status === 'completed';
+  });
+  const todayRevenue = todaySales.reduce((sum, s) => sum + s.total, 0);
+  
+  // This week's revenue
+  const weekStart = new Date(today);
+  weekStart.setDate(weekStart.getDate() - 7);
+  const weekSales = sales.filter(s => {
+    const saleDate = new Date(s.createdAt);
+    return saleDate >= weekStart && s.status === 'completed';
+  });
+  const weekRevenue = weekSales.reduce((sum, s) => sum + s.total, 0);
+  
+  // This month's revenue
+  const monthStart = new Date(today.getFullYear(), today.getMonth(), 1);
+  const monthSales = sales.filter(s => {
+    const saleDate = new Date(s.createdAt);
+    return saleDate >= monthStart && s.status === 'completed';
+  });
+  const monthRevenue = monthSales.reduce((sum, s) => sum + s.total, 0);
+  
+  // Last 7 days sales data for chart
+  const last7Days = [];
+  for (let i = 6; i >= 0; i--) {
+    const d = new Date(today);
+    d.setDate(d.getDate() - i);
+    const dateKey = d.toISOString().split('T')[0];
+    const dayStart = new Date(d);
+    dayStart.setHours(0, 0, 0, 0);
+    const dayEnd = new Date(d);
+    dayEnd.setHours(23, 59, 59, 999);
+    
+    const dayTotal = sales
+      .filter(s => {
+        const saleDate = new Date(s.createdAt);
+        return saleDate >= dayStart && saleDate <= dayEnd && s.status === 'completed';
+      })
+      .reduce((sum, s) => sum + s.total, 0);
+    
+    last7Days.push({ date: dateKey, revenue: dayTotal });
+  }
+  
+  // Top products
+  const productCounts = {};
+  sales.forEach(sale => {
+    if (sale.status === 'completed') {
+      sale.items.forEach(item => {
+        if (!productCounts[item.productId]) {
+          productCounts[item.productId] = { quantity: 0, revenue: 0 };
+        }
+        productCounts[item.productId].quantity += item.quantity;
+        productCounts[item.productId].revenue += item.quantity * item.price;
+      });
+    }
+  });
+  
+  const topProducts = Object.entries(productCounts)
+    .map(([productId, data]) => {
+      const product = products.find(p => p.id === productId);
+      return { productId, name: product?.name || 'Unknown', quantity: data.quantity, revenue: data.revenue };
+    })
+    .sort((a, b) => b.revenue - a.revenue)
+    .slice(0, 5);
+  
+  // Low stock alert count
+  const lowStockCount = inventory.filter(i => {
+    const threshold = i.lowStockThreshold || settings.lowStockThreshold || 15;
+    return i.quantity <= threshold;
+  }).length;
+  
+  res.json({
+    todayRevenue,
+    weekRevenue,
+    monthRevenue,
+    todayOrders: todaySales.length,
+    weekOrders: weekSales.length,
+    monthOrders: monthSales.length,
+    last7Days,
+    topProducts,
+    lowStockCount,
+    settings
+  });
+});
+
+module.exports = router;

src/routes/sales.js

@@ -0,0 +1,140 @@
+const express = require('express');
+const { body, validationResult } = require('express-validator');
+const { readData, writeData, findById, addItem, updateItem } = require('../../store');
+const { verifyToken } = require('../middleware/auth');
+
+const router = express.Router();
+
+// Get all sales
+router.get('/', (req, res) => {
+  const sales = readData('sales');
+  res.json(sales.sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt)));
+});
+
+// Get sale by ID
+router.get('/:id', (req, res) => {
+  const sale = findById('sales', req.params.id);
+  if (!sale) {
+    return res.status(404).json({ error: 'Sale not found' });
+  }
+  res.json(sale);
+});
+
+// Create new sale
+router.post('/', verifyToken, [
+  body('items').isArray({ min: 1 }),
+  body('total').isFloat({ min: 0 })
+], (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const { items, subtotal, tax, discount, total, paymentMethod, customerId, notes } = req.body;
+    const products = readData('products');
+    const inventory = readData('inventory');
+    
+    // Process each item - update inventory
+    const updatedInventory = [...inventory];
+    
+    items.forEach(item => {
+      const product = products.find(p => p.id === item.productId);
+      if (product) {
+        const invIndex = updatedInventory.findIndex(i => i.productId === product.sku);
+        if (invIndex !== -1) {
+          updatedInventory[invIndex].quantity = Math.max(0, updatedInventory[invIndex].quantity - item.quantity);
+        }
+      }
+    });
+    
+    writeData('inventory', updatedInventory);
+    
+    // Create sale record
+    const sale = addItem('sales', {
+      items,
+      subtotal,
+      tax,
+      discount,
+      total,
+      paymentMethod,
+      customerId,
+      notes,
+      status: 'completed',
+      cashierId: req.user.id,
+      cashierName: req.user.name
+    });
+    
+    res.status(201).json(sale);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Process refund
+router.post('/:id/refund', verifyToken, [
+  body('reason').trim().notEmpty()
+], (req, res) => {
+  try {
+    const { id } = req.params;
+    const { reason } = req.body;
+    
+    const sale = findById('sales', id);
+    if (!sale) {
+      return res.status(404).json({ error: 'Sale not found' });
+    }
+    
+    if (sale.status === 'refunded') {
+      return res.status(400).json({ error: 'Sale already refunded' });
+    }
+    
+    // Restore inventory
+    const products = readData('products');
+    const inventory = readData('inventory');
+    const updatedInventory = [...inventory];
+    
+    sale.items.forEach(item => {
+      const invIndex = updatedInventory.findIndex(i => i.productId === item.sku);
+      if (invIndex !== -1) {
+        updatedInventory[invIndex].quantity += item.quantity;
+      }
+    });
+    
+    writeData('inventory', updatedInventory);
+    
+    // Update sale status
+    const updatedSale = updateItem('sales', id, {
+      status: 'refunded',
+      refundReason: reason,
+      refundedBy: req.user.name,
+      refundedAt: new Date().toISOString()
+    });
+    
+    res.json(updatedSale);
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Get receipt
+router.get('/receipt/:id', (req, res) => {
+  const sale = findById('sales', req.params.id);
+  if (!sale) {
+    return res.status(404).json({ error: 'Sale not found' });
+  }
+  
+  const settings = readData('settings');
+  
+  const receipt = {
+    ...sale,
+    storeName: settings.storeName,
+    storeAddress: settings.storeAddress,
+    storePhone: settings.storePhone,
+    receiptHeader: settings.receiptHeader,
+    receiptFooter: settings.receiptFooter
+  };
+  
+  res.json(receipt);
+});
+
+module.exports = router;

src/routes/settings.js

@@ -0,0 +1,21 @@
+const express = require('express');
+const { readData, writeData } = require('../../store');
+const { verifyToken, adminOnly } = require('../middleware/auth');
+
+const router = express.Router();
+
+// Get settings
+router.get('/', (req, res) => {
+  const settings = readData('settings');
+  res.json(settings);
+});
+
+// Update settings (admin only)
+router.put('/', verifyToken, adminOnly, (req, res) => {
+  const settings = readData('settings');
+  const updatedSettings = { ...settings, ...req.body };
+  writeData('settings', updatedSettings);
+  res.json(updatedSettings);
+});
+
+module.exports = router;

store.js

@@ -0,0 +1,246 @@
+const fs = require('fs');
+const path = require('path');
+const bcrypt = require('bcryptjs');
+const { v4: uuidv4 } = require('uuid');
+
+const DATA_DIR = path.join(__dirname, '../data');
+
+// Ensure data directory exists
+if (!fs.existsSync(DATA_DIR)) {
+  fs.mkdirSync(DATA_DIR, { recursive: true });
+}
+
+// File paths
+const files = {
+  users: path.join(DATA_DIR, 'users.json'),
+  products: path.join(DATA_DIR, 'products.json'),
+  inventory: path.join(DATA_DIR, 'inventory.json'),
+  sales: path.join(DATA_DIR, 'sales.json'),
+  customers: path.join(DATA_DIR, 'customers.json'),
+  employees: path.join(DATA_DIR, 'employees.json'),
+  settings: path.join(DATA_DIR, 'settings.json')
+};
+
+// Initialize default admin user
+const hashedPassword = bcrypt.hashSync('admin123', 10);
+
+// Default data - products only
+const defaultData = {
+  users: [
+    {
+      id: uuidv4(),
+      username: 'admin',
+      password: hashedPassword,
+      role: 'admin',
+      name: 'System Administrator',
+      email: 'admin@amkpos.com',
+      createdAt: new Date().toISOString()
+    }
+  ],
+  products: [
+    {
+      id: uuidv4(),
+      name: 'Coffee Latte',
+      description: 'Premium smooth latte with espresso',
+      category: 'Beverages',
+      price: 4.50,
+      salePrice: null,
+      sku: 'COF-LAT-001',
+      barcode: '1234567890123',
+      image: 'https://images.unsplash.com/photo-1572442388796-11668a67e53d?w=200',
+      inStock: true,
+      createdAt: new Date().toISOString()
+    },
+    {
+      id: uuidv4(),
+      name: 'Espresso Shot',
+      description: 'Rich and bold espresso shot',
+      category: 'Beverages',
+      price: 3.00,
+      salePrice: null,
+      sku: 'COF-ESP-001',
+      barcode: '1234567890124',
+      image: 'https://images.unsplash.com/photo-1510707577719-ae7c14805e3a?w=200',
+      inStock: true,
+      createdAt: new Date().toISOString()
+    },
+    {
+      id: uuidv4(),
+      name: 'Turkey Sandwich',
+      description: 'Freshly baked bread with turkey',
+      category: 'Food',
+      price: 8.00,
+      salePrice: null,
+      sku: 'SAN-TUR-001',
+      barcode: '1234567890125',
+      image: 'https://images.unsplash.com/photo-1528735602780-2552fd46c7af?w=200',
+      inStock: true,
+      createdAt: new Date().toISOString()
+    },
+    {
+      id: uuidv4(),
+      name: 'Garden Salad',
+      description: 'Fresh mixed greens with vinaigrette',
+      category: 'Food',
+      price: 7.50,
+      salePrice: 6.50,
+      sku: 'SAL-GAR-001',
+      barcode: '1234567890126',
+      image: 'https://images.unsplash.com/photo-1512621776951-a57141f2eefd?w=200',
+      inStock: true,
+      createdAt: new Date().toISOString()
+    },
+    {
+      id: uuidv4(),
+      name: 'Blueberry Muffin',
+      description: 'Freshly baked blueberry muffin',
+      category: 'Bakery',
+      price: 3.50,
+      salePrice: null,
+      sku: 'MUF-BLU-001',
+      barcode: '1234567890127',
+      image: 'https://images.unsplash.com/photo-1607958996333-41aef7caefaa?w=200',
+      inStock: true,
+      createdAt: new Date().toISOString()
+    },
+    {
+      id: uuidv4(),
+      name: 'Orange Juice',
+      description: 'Freshly squeezed orange juice',
+      category: 'Beverages',
+      price: 4.00,
+      salePrice: null,
+      sku: 'JUI-ORA-001',
+      barcode: '1234567890128',
+      image: 'https://images.unsplash.com/photo-1600271886742-f049cd451bba?w=200',
+      inStock: true,
+      createdAt: new Date().toISOString()
+    }
+  ],
+  inventory: [],
+  sales: [],
+  customers: [],
+  employees: [
+    {
+      id: uuidv4(),
+      name: 'John Smith',
+      email: 'john@amkpos.com',
+      phone: '555-0101',
+      role: 'Manager',
+      hireDate: '2024-01-15',
+      active: true
+    },
+    {
+      id: uuidv4(),
+      name: 'Sarah Johnson',
+      email: 'sarah@amkpos.com',
+      phone: '555-0102',
+      role: 'Staff',
+      hireDate: '2024-02-01',
+      active: true
+    }
+  ],
+  settings: {
+    storeName: 'AMK POS',
+    storeEmail: 'info@amkpos.com',
+    storePhone: '555-0100',
+    storeAddress: '123 Main Street, City, State 12345',
+    taxRate: 8.5,
+    currency: 'USD',
+    lowStockThreshold: 15,
+    receiptHeader: 'Thank you for visiting AMK POS!',
+    receiptFooter: 'Please come again!'
+  }
+};
+
+// Initialize data files
+function initializeDataFiles() {
+  Object.keys(files).forEach(function(key) {
+    if (!fs.existsSync(files[key])) {
+      var data = defaultData[key];
+      fs.writeFileSync(files[key], JSON.stringify(data, null, 2));
+      console.log('Initialized ' + key + '.json');
+    }
+  });
+}
+
+// Generic read function
+function readData(file) {
+  try {
+    var data = fs.readFileSync(files[file], 'utf8');
+    return JSON.parse(data);
+  } catch (error) {
+    console.error('Error reading ' + file + ':', error.message);
+    return [];
+  }
+}
+
+// Generic write function
+function writeData(file, data) {
+  try {
+    fs.writeFileSync(files[file], JSON.stringify(data, null, 2));
+    return true;
+  } catch (error) {
+    console.error('Error writing ' + file + ':', error.message);
+    return false;
+  }
+}
+
+// Find by ID
+function findById(file, id) {
+  var data = readData(file);
+  return data.find(function(item) { return item.id === id; });
+}
+
+// Add item
+function addItem(file, item) {
+  var data = readData(file);
+  item.id = uuidv4();
+  item.createdAt = new Date().toISOString();
+  data.push(item);
+  writeData(file, data);
+  return item;
+}
+
+// Update item
+function updateItem(file, id, updates) {
+  var data = readData(file);
+  var index = data.findIndex(function(item) { return item.id === id; });
+  if (index !== -1) {
+    data[index] = Object.assign({}, data[index], updates, { updatedAt: new Date().toISOString() });
+    writeData(file, data);
+    return data[index];
+  }
+  return null;
+}
+
+// Delete item
+function deleteItem(file, id) {
+  var data = readData(file);
+  var index = data.findIndex(function(item) { return item.id === id; });
+  if (index !== -1) {
+    data.splice(index, 1);
+    writeData(file, data);
+    return true;
+  }
+  return false;
+}
+
+// Find by field
+function findByField(file, field, value) {
+  var data = readData(file);
+  return data.find(function(item) { return item[field] === value; });
+}
+
+module.exports = {
+  DATA_DIR: DATA_DIR,
+  files: files,
+  readData: readData,
+  writeData: writeData,
+  findById: findById,
+  addItem: addItem,
+  updateItem: updateItem,
+  deleteItem: deleteItem,
+  findByField: findByField,
+  initializeDataFiles: initializeDataFiles
+};