import express from 'express';
import { ApolloServer } from '@apollo/server';
import { expressMiddleware } from '@apollo/server/express4';
import { json } from 'body-parser';
import { typeDefs } from './graphql/schema';
import { resolvers } from './graphql/resolvers';
import { createDb } from './db';
import logger from './logger';
import { TestPrinter } from './printer/test-printer';
import cors from 'cors';

const app = express();
const port = process.env.PORT || 4000;

async function startServer() {
  const db = createDb();
  const printer = new TestPrinter();

  const server = new ApolloServer({
    typeDefs,
    resolvers,
  });

  await server.start();

  // Enable CORS for the frontend
  app.use(cors({
    origin: 'http://localhost:5173',
    credentials: true
  }));

  app.use(json());
  app.use(
    '/graphql',
    expressMiddleware(server, {
      context: async () => ({ db, printer }),
    })
  );

  const httpServer = app.listen(port, () => {
    logger.info(`Server running at http://localhost:${port}/graphql`);
  });

  // Graceful shutdown
  process.on('SIGTERM', () => {
    logger.info('SIGTERM received. Shutting down gracefully...');
    httpServer.close(() => {
      logger.info('Server closed');
      process.exit(0);
    });
  });

  process.on('SIGINT', () => {
    logger.info('SIGINT received. Shutting down gracefully...');
    httpServer.close(() => {
      logger.info('Server closed');
      process.exit(0);
    });
  });
}

startServer().catch((error) => {
  logger.error('Failed to start server:', error);
  process.exit(1);
});