require('dotenv').config();
const express = require('express');
const helmet = require('helmet');
const cors = require('cors');
const rateLimit = require('express-rate-limit');
const path = require('path');
const { initializeDatabase } = require('./src/database/db');
const { startFileWatcher } = require('./src/services/fileWatcher');
const { startExpirationChecker } = require('./src/services/expirationChecker');
const logger = require('./src/utils/logger');

// Import routes
const authRoutes = require('./src/routes/auth');
const eventRoutes = require('./src/routes/events');
const galleryRoutes = require('./src/routes/gallery');
const adminRoutes = require('./src/routes/admin');
const adminAuthRoutes = require('./src/routes/adminAuth');

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

// Security middleware
app.use(helmet());

// CORS configuration
const corsOptions = {
  origin: function (origin, callback) {
    const allowedOrigins = [
      process.env.FRONTEND_URL || 'http://localhost:3005',
      process.env.ADMIN_URL || 'http://localhost:3005',
      'http://localhost:5173', // Vite dev server
      'http://localhost:3002', // Backend server
      'http://localhost:3001', // For API testing
      'http://localhost:3000'  // Direct backend access
    ];
    
    // Allow requests with no origin (like mobile apps or curl)
    if (!origin || allowedOrigins.indexOf(origin) !== -1) {
      callback(null, true);
    } else {
      callback(new Error('Not allowed by CORS'));
    }
  },
  credentials: true
};

app.use(cors(corsOptions));

// Rate limiting
const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100 // limit each IP to 100 requests per windowMs
});

const authLimiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 5 // limit auth attempts
});

app.use('/api/', limiter);
app.use('/api/auth', authLimiter);

// Body parsing middleware
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

// Static file serving for photos (protected)
app.use('/photos', require('./src/middleware/photoAuth'), express.static(path.join(__dirname, 'storage/events/active')));

// Health check endpoint
app.get('/api/health', (req, res) => {
  res.json({ status: 'ok', timestamp: new Date().toISOString() });
});

// Routes
app.use('/api/auth', authRoutes);
app.use('/api/events', eventRoutes);
app.use('/api/gallery', galleryRoutes);
app.use('/api/admin', adminRoutes);
app.use('/api/admin/auth', adminAuthRoutes);

// Error handling middleware
app.use((err, req, res, next) => {
  logger.error(err.stack);
  res.status(500).json({ error: 'Something went wrong!' });
});

// Initialize services
async function startServer() {
  try {
    // Initialize database
    await initializeDatabase();
    
    // Start file watcher
    startFileWatcher();
    
    // Start expiration checker
    startExpirationChecker();
    
    app.listen(PORT, () => {
      logger.info(`Server running on port ${PORT}`);
      logger.info(`Admin interface: ${process.env.ADMIN_URL || 'http://localhost:3000'}`);
      logger.info(`Frontend: ${process.env.FRONTEND_URL || 'http://localhost:3001'}`);
    });
  } catch (error) {
    logger.error('Failed to start server:', error);
    process.exit(1);
  }
}

startServer();

module.exports = app; // For testing