import http from 'http'

const createProxy = ({ name, listenPort, targetHost, targetPort }) => {
  http
    .createServer((req, res) => {
      const proxyReq = http.request(
        {
          hostname: targetHost,
          port: targetPort,
          path: req.url,
          method: req.method,
          headers: req.headers,
        },
        (proxyRes) => {
          res.writeHead(proxyRes.statusCode || 502, proxyRes.headers)
          proxyRes.pipe(res)
        }
      )

      proxyReq.on('error', (err) => {
        res.statusCode = 502
        res.end(`Bad gateway: ${err.message}`)
      })

      req.pipe(proxyReq)
    })
    .listen(listenPort, '127.0.0.1', () => {
      console.log(`${name} proxy listening on 127.0.0.1:${listenPort} -> ${targetHost}:${targetPort}`)
    })
}

const wizardPort = Number(process.env.WIZARD_PORT || 8080)
const backendPort = Number(process.env.BACKEND_PORT || 8000)
const frontendPort = Number(process.env.FRONTEND_PORT || 3000)

createProxy({
  name: 'wizard',
  listenPort: wizardPort,
  targetHost: process.env.WIZARD_HOST || 'wizard',
  targetPort: wizardPort,
})

createProxy({
  name: 'backend',
  listenPort: backendPort,
  targetHost: process.env.BACKEND_HOST || 'backend',
  targetPort: backendPort,
})

createProxy({
  name: 'frontend',
  listenPort: frontendPort,
  targetHost: process.env.FRONTEND_HOST || 'frontend',
  targetPort: frontendPort,
})