import express, { Request, Response, NextFunction } from 'express';
import cors from 'cors';
import { db } from './db/connection.js';
import quizzesRouter from './routes/quizzes.js';
import usersRouter from './routes/users.js';

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

app.use(cors({
  origin: process.env.CORS_ORIGIN || 'http://localhost:5173',
  credentials: true,
}));

app.use((req: Request, res: Response, next: NextFunction) => {
  express.json({ limit: '10mb' })(req, res, (err) => {
    if (err instanceof SyntaxError && 'body' in err) {
      res.status(400).json({ error: 'Invalid JSON' });
      return;
    }
    if (err) {
      next(err);
      return;
    }
    next();
  });
});

app.get('/health', (_req: Request, res: Response) => {
  res.json({ status: 'ok', timestamp: new Date().toISOString() });
});

app.use('/api/quizzes', quizzesRouter);
app.use('/api/users', usersRouter);

app.use((err: Error, _req: Request, res: Response, _next: NextFunction) => {
  console.error('Unhandled error:', err);
  res.status(500).json({ error: 'Internal server error' });
});

app.listen(PORT, () => {
  console.log(`Kaboot backend running on port ${PORT}`);
  console.log(`Database: ${process.env.DATABASE_PATH || 'default location'}`);
  console.log(`CORS origin: ${process.env.CORS_ORIGIN || 'http://localhost:5173'}`);
});

process.on('SIGTERM', () => {
  console.log('Shutting down...');
  db.close();
  process.exit(0);
});