server.js

require('dotenv').config();
const express = require('express');
const cors = require('cors');
const path = require('path');

const app = express();
const PORT = process.env.PORT || 3000;

// 中間件
app.use(cors());
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

// 靜態文件服務（前端）
app.use(express.static(path.join(__dirname, 'public')));

// API 路由
app.use('/api/auth', require('./routes/auth'));
app.use('/api/tenants', require('./routes/tenants'));
app.use('/api/stores', require('./routes/stores'));
app.use('/api/products', require('./routes/products'));
app.use('/api/inventory', require('./routes/inventory'));
app.use('/api/purchases', require('./routes/purchases'));
app.use('/api/sales', require('./routes/sales'));
app.use('/api/payments', require('./routes/payments'));
app.use('/api/expenses', require('./routes/expenses'));
app.use('/api/reports', require('./routes/reports'));

// 健康檢查
app.get('/api/health', (req, res) => {
  res.json({ status: 'OK', timestamp: new Date().toISOString() });
});

// 404 處理
app.use((req, res) => {
  if (req.path.startsWith('/api/')) {
    res.status(404).json({ error: 'API endpoint not found' });
  } else {
    res.sendFile(path.join(__dirname, 'public', 'index.html'));
  }
});

// 錯誤處理
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({
    error: 'Internal server error',
    message: process.env.NODE_ENV === 'development' ? err.message : undefined
  });
});

// 啟動服務器
app.listen(PORT, () => {
  console.log(`🚀 Server running on port ${PORT}`);
  console.log(`📊 Environment: ${process.env.NODE_ENV || 'development'}`);
  console.log(`🌐 API: http://localhost:${PORT}/api`);
  console.log(`🖥️  Frontend: http://localhost:${PORT}`);
});

module.exports = app;