const { fork } = require('node:child_process')
const { join } = require('node:path')

const { EXIT } = require('./consts')
const CLI = require('./cli')

const help_message = "Start the server configured for stress testing."

const cli = CLI({
  grammar: [
    [["--help"], "Show this help message"],
  ],
})

const help = (exit_code) => {
  console.log("Usage: lamassu-server-stress-testing server ARGS...")
  console.log(help_message)
  cli.help()
  return exit_code
}

const start_server = (args) =>
  new Promise((resolve, reject) => {
    const lamassu_server = join(__dirname, "../../bin/lamassu-server")
    const ls = fork(lamassu_server, args, {
      cwd: process.cwd(),
      encoding: 'utf8',
      env: { LAMASSU_STRESS_TESTING: "YES" },
    })

    ls.on('error', (error) => {
      console.log(error)
      resolve(EXIT.EXCEPTION)
    })

    ls.on('exit', (code, signal) => {
      console.error("lamassu-server code:", code)
      console.error("lamassu-server signal:", signal)
      resolve(typeof(code) === 'number' ? code : EXIT.EXCEPTION)
    })
  })

const run = async (args) => {
  const [err, options, positional] = cli.parse(args)
  if (err) {
    console.error(err)
    return help(EXIT.BADARGS)
  }

  if (options.help)
    return help(EXIT.OK)

  return await start_server(positional)
}

module.exports = {
  help_message,
  run,
}