import express from 'express';
import pino from 'pino';
import pinoHttp from 'pino-http';
import { requestContext } from './middleware/request-context.js';
import { errorHandler, notFoundHandler } from './middleware/error-handler.js';
import { healthRouter } from './routes/health.js';
import { createCoreRouter, createLegacyCoreRouter } from './routes/core.js';
import { assertSafeRuntimeConfig } from './lib/runtime-safety.js';

const logger = pino({ level: process.env.LOG_LEVEL || 'info' });

export function createApp() {
  assertSafeRuntimeConfig();
  const app = express();

  app.use(requestContext);
  app.use(
    pinoHttp({
      logger,
      customProps: (req) => ({ requestId: req.requestId }),
    })
  );
  app.use(express.json({ limit: '2mb' }));

  app.use(healthRouter);
  app.use('/core', createCoreRouter());
  app.use('/', createLegacyCoreRouter());

  app.use(notFoundHandler);
  app.use(errorHandler);

  return app;
}