app.js

import 'dotenv/config';
import express, { json, urlencoded } from 'express';
import cors from 'cors';
import morgan from 'morgan';
import rateLimit from 'express-rate-limit';
import swaggerUi from 'swagger-ui-express';
import swaggerSpec from './swagger/swagger.js';
import connectDB from './config/db.js';
import errorHandler from './middlewares/errorHandler.js';

import authRoutes from './routes/authRoutes.js';
import transactionRoutes from './routes/transactionRoutes.js';
import dashboardRoutes from './routes/dashboardRoutes.js';
import userRoutes from './routes/userRoutes.js';

const { serve, setup } = swaggerUi;

const app = express();

// Connect to MongoDB
if (process.env.NODE_ENV !== 'test') {
  connectDB();
}

// Middleware
app.use(cors());
app.use(json());
app.use(urlencoded({ extended: true }));

if (process.env.NODE_ENV === 'development') {
  app.use(morgan('dev'));
}

// Rate limiting - 100 requests per 15 minutes per IP
const limiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 100,
  standardHeaders: true,
  legacyHeaders: false,
  message: { success: false, message: 'Too many requests. Please try again later.' },
});
app.use('/api', limiter);

// API docs
app.use('/api/docs', serve, setup(swaggerSpec, {
  customSiteTitle: 'Finance Dashboard API',
  customCss: '.swagger-ui .topbar { background-color: #1a1a2e; }',
}));

// Routes
app.use('/api/auth', authRoutes);
app.use('/api/transactions', transactionRoutes);
app.use('/api/dashboard', dashboardRoutes);
app.use('/api/users', userRoutes);

// Root route for browser and API clients
app.get('/', (req, res) => {
  if (req.accepts('html')) {
    return res.redirect('/api/docs');
  }

  return res.status(200).json({
    success: true,
    message: 'Finance Dashboard API is running.',
    docs: '/api/docs',
    health: '/health',
  });
});

// Health check
app.get('/health', (req, res) => {
  res.json({ success: true, message: 'Finance Dashboard API is running', timestamp: new Date() });
});

// 404 handler
app.use((req, res) => {
  res.status(404).json({ success: false, message: `Route ${req.originalUrl} not found.` });
});

// Global error handler
app.use(errorHandler);

const PORT = process.env.PORT || 3000;
if (process.env.NODE_ENV !== 'test') {
  app.listen(PORT, () => {
    console.log(`Server running on http://localhost:${PORT}`);
    console.log(`API docs available at http://localhost:${PORT}/api/docs`);
  });
}

export default app;