import Fastify from 'fastify';
import fastifyWebsocket from '@fastify/websocket';
import { loadConfig } from './config.js';
import { getPool, closeDb } from './db.js';
import { registerHealthRoutes } from './routes/health.js';
import { registerTerminalRoutes } from './routes/terminals.js';
import { registerWsAttachRoute } from './ws/attach.js';

async function main(): Promise<void> {
  const config = loadConfig();

  const app = Fastify({
    logger: { level: config.LOG_LEVEL },
  });

  app.removeContentTypeParser(['application/json']);
  app.addContentTypeParser('application/json', { parseAs: 'string' }, (_req, body, done) => {
    const str = (body as string) ?? '';
    if (str.trim().length === 0) {
      done(null, {});
      return;
    }
    try {
      done(null, JSON.parse(str));
    } catch (err) {
      done(err as Error, undefined);
    }
  });

  getPool(config.DATABASE_URL);

  await app.register(fastifyWebsocket);

  registerHealthRoutes(app);
  registerTerminalRoutes(app, config.TMUX_CONF_PATH);
  registerWsAttachRoute(app, config.TMUX_CONF_PATH);

  const shutdown = async (signal: string) => {
    app.log.info(`received ${signal}, shutting down`);
    try {
      await app.close();
      await closeDb();
      process.exit(0);
    } catch (err) {
      app.log.error(err);
      process.exit(1);
    }
  };

  process.on('SIGINT', () => void shutdown('SIGINT'));
  process.on('SIGTERM', () => void shutdown('SIGTERM'));

  await app.listen({ port: config.PORT, host: config.HOST });
  app.log.info(`booterm listening on http://${config.HOST}:${config.PORT}`);
}

main().catch((err) => {
  console.error('Fatal startup error:', err);
  process.exit(1);
});