import 'dotenv/config';
import cors from 'cors';
import express, { type NextFunction, type Request, type Response } from 'express';
import { buildApiPath, getConfig } from './config';
import { TursoClient } from './lib/db';
import { createHealthRouter } from './routes/health';
import { createTodosRouter } from './routes/todos';

const config = getConfig();
const app = express();
const db = new TursoClient(config);

app.disable('x-powered-by');
app.use(cors({ origin: config.corsOrigin === '*' ? true : config.corsOrigin }));
app.use(express.json({ limit: '1mb' }));

const apiRoot = config.apiPrefix || '/';
app.use(apiRoot, createHealthRouter(config));
app.use(apiRoot, createTodosRouter(config, db));


// 10-second health check logger
setInterval(() => {
  console.log('[Health Check] Sandbox is healthy at ' + new Date().toISOString());
}, 10000);

app.post('/_cron/tick', (req, res) => {
  const authHeader = req.headers.authorization;
  if (!authHeader || authHeader !== 'Bearer ' + process.env.CRON_TOKEN) {
    return res.status(401).json({ success: false, error: 'Unauthorized' });
  }
  console.log('[Tick] Cloud Run cron tick triggered.');
  res.status(200).json({ success: true });
});

app.use((_req, res) => {
  res.status(404).json({ success: false, error: 'Not found' });
});

app.use((error: Error, _req: Request, res: Response, _next: NextFunction) => {
  const status = /required|invalid|missing/i.test(error.message) ? 400 : 500;
  res.status(status).json({
    success: false,
    error: error.message || 'Unhandled error',
  });
});

app.listen(config.port, '0.0.0.0', () => {
  const healthPath = buildApiPath(config, '/health');
  console.log(`Backend todo template listening on port ${config.port}`);
  console.log(`Health check available at ${healthPath}`);
});