const express = require('express');
const cors = require('cors');
const helmet = require('helmet');
const morgan = require('morgan');
const prisma = require('./lib/prisma');
const { globalErrorHandler } = require('./middleware/errorHandler');

const experimentsRouter = require('./routes/experiments');
const animalsRouter = require('./routes/animals');
const dailyStatusesRouter = require('./routes/dailyStatuses');
const auditLogsRouter = require('./routes/auditLogs');

const app = express();
const PORT = process.env.PORT || 3001;

// Security & utility middleware
app.use(helmet());
app.use(cors({
  origin: process.env.CORS_ORIGIN || '*',
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Authorization'],
}));
app.use(express.json({ limit: '1mb' }));
app.use(morgan(process.env.NODE_ENV === 'production' ? 'combined' : 'dev'));

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

// API routes
app.use('/api/experiments', experimentsRouter);
app.use('/api/animals', animalsRouter);
app.use('/api/daily-statuses', dailyStatusesRouter);
app.use('/api/audit-logs', auditLogsRouter);

// 404 handler for unknown routes
app.use((req, res) => {
  res.status(404).json({ error: `Route ${req.method} ${req.path} not found` });
});

// Global error handler (must be last)
app.use(globalErrorHandler);

async function startServer() {
  try {
    await prisma.$connect();
    console.log('Database connected successfully');

    // Run migrations on startup in production
    if (process.env.NODE_ENV === 'production') {
      const { execSync } = require('child_process');
      execSync('npx prisma migrate deploy', { stdio: 'inherit' });
    }

    app.listen(PORT, '0.0.0.0', () => {
      console.log(`Server running on port ${PORT}`);
    });
  } catch (err) {
    console.error('Failed to start server:', err);
    process.exit(1);
  }
}

startServer();

module.exports = app; // export for testing