Swagger Node.js API Runner (Fixed)

const express = require('express');
const app = express();
const swaggerRunner = require('swagger-node-runner-fixed');
const path = require('path');
const fs = require('fs');
const yaml = require('js-yaml');

const port = process.env.PORT || 3000;
const swaggerSpecPath = path.resolve(__dirname, './api/swagger/swagger.yaml');
const controllersPath = path.resolve(__dirname, './api/controllers');

// Ensure required directories exist for demonstration
if (!fs.existsSync(path.dirname(swaggerSpecPath))) fs.mkdirSync(path.dirname(swaggerSpecPath), { recursive: true });
if (!fs.existsSync(controllersPath)) fs.mkdirSync(controllersPath, { recursive: true });

// Minimal swagger.yaml for quickstart (create this file manually at ./api/swagger/swagger.yaml)
fs.writeFileSync(swaggerSpecPath, `swagger: "2.0"
info:
  title: "My API"
  version: "1.0.0"
basePath: /
paths:
  /hello:
    get:
      operationId: helloWorld
      responses:
        200:
          description: "OK"
          schema:
            type: string
`);

// Minimal controller (create this file manually at ./api/controllers/hello_world.js)
fs.writeFileSync(path.join(controllersPath, 'hello_world.js'), `module.exports = {
  helloWorld: function(req, res) {
    res.send('Hello from Swagger!');
  }
};
`);

// Load the Swagger definition
const swaggerDoc = yaml.load(fs.readFileSync(swaggerSpecPath, 'utf8'));

const config = {
  appRoot: __dirname, // Required for swagger-node-runner to find controllers
  swagger: swaggerDoc,
  controllers: controllersPath // Path to your API controllers
};

swaggerRunner.run(app, config, function(err) {
  if (err) {
    console.error('Failed to initialize swagger-node-runner:', err.message);
    process.exit(1);
  }

  // swagger-node-runner-fixed will automatically attach middleware and routes
  app.listen(port, () => {
    console.log(`Server running on http://localhost:${port}`);
    console.log(`Try: curl http://localhost:${port}/hello`);
    console.log(`Swagger UI is typically available at http://localhost:${port}/docs (if configured via fittings)`);
  });
});