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import dotenv from 'dotenv'

import './lib/feature-flags.js'

import './lib/check-node-version.js'

import './lib/handle-exceptions.js'

import portUsed from 'port-used'

import createApp from './lib/app.js'

import warmServer from './lib/warm-server.js'

import http from 'http'

dotenv.config()

const { PORT, NODE_ENV } = process.env

const port = Number(PORT) || 4000

export async function main() {

if (NODE_ENV !== 'production') {

await checkPortAvailability()

}

return await startServer()

}

async function checkPortAvailability() {

// Check that the development server is not already running

const portInUse = await portUsed.check(port)

if (portInUse) {

console.log(`\n\n\nPort ${port} is not available. You may already have a server running.`)

console.log(

`Try running \`npx kill-port ${port}\` to shut down all your running node processes.\n\n\n`

)

console.log('\x07') // system 'beep' sound

process.exit(1)

}

}

async function startServer() {

const app = createApp()

// Warm up as soon as possible.

// The `warmServer()` function is idempotent and it will soon be used

// by some middleware, but there's no point in having a started server

// without this warmed up. Besides, by starting this slow thing now,

// it can start immediately instead of waiting for the first request

// to trigger it to warm up. That way, when in development and triggering

// a `nodemon` restart, there's a good chance the warm up has come some

// way before you manage to reach for your browser to do a page refresh.

await warmServer()

// Workaround for https://github.com/expressjs/express/issues/1101

const server = http.createServer(app)

return server

.listen(port, () => console.log(`app running on http://localhost:${port}`))

.on('error', () => server.close())

}