import express from 'express';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { offlineManifest } from './src/services/offline-manifest.js';
import { setAppImageCopyright } from './src/services/copyright.js';
import { config, ensureRuntimeDirectories } from './src/config.js';
import { openDatabase } from './src/database.js';
import { createApiRouter } from './src/routes/api.js';
import { notFoundHandler, errorHandler } from './src/middleware/errors.js';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
ensureRuntimeDirectories();
const db = openDatabase();
const app = express();
const publicDirectory = path.join(__dirname, 'public');

app.disable('x-powered-by');
app.use(express.json({
  limit: config.maxJsonBodyBytes,
  type: ['application/json', 'application/*+json', 'text/json']
}));
app.use(express.urlencoded({ extended: true, limit: '2mb' }));
app.get('/api/offline-manifest', (req, res) => {
  res.setHeader('Cache-Control', 'no-store');
  res.json(offlineManifest(publicDirectory));
});
app.use('/api', createApiRouter(db));
app.use(express.static(publicDirectory, {
  extensions: ['html'],
  etag: true,
  lastModified: true,
  maxAge: 0,
  setHeaders(res, filePath) {
    setAppImageCopyright(res, filePath);
    const extension = path.extname(filePath).toLowerCase();
    const authoredAsset = ['.html', '.css', '.js'].includes(extension);
    res.setHeader(
      'Cache-Control',
      authoredAsset ? 'no-cache, no-store, must-revalidate' : 'public, max-age=0, must-revalidate'
    );
    if (authoredAsset) {
      res.setHeader('Pragma', 'no-cache');
      res.setHeader('Expires', '0');
    }
  }
}));
app.use(notFoundHandler);
app.use(errorHandler);

const server = app.listen(config.port, config.host, () => {
  console.log(`Wegwichtel läuft auf http://${config.host}:${config.port}`);
});

function shutdown(signal) {
  console.log(`${signal}: Server wird beendet.`);
  server.close(() => {
    db.close();
    process.exit(0);
  });
}
process.on('SIGINT', () => shutdown('SIGINT'));
process.on('SIGTERM', () => shutdown('SIGTERM'));