const { spawn } = require('child_process')
let pidMap = {}

/**
 * options: { onSuccess: null | function, onError: null | function, onClose: null | function }
 */
function start(command, args, options = {}) {
  const childProgress = spawn(command, args)
  pidMap[childProgress.pid] = childProgress

  childProgress.stdout.on('data' data => {
    options.onSuccess && options.onSuccess(data)
  })

  childProgress.stderr.on('data', data => {
    options.onError && options.onError(data)
  })

  childProgress.on('close', code => {
    options.onClose && options.onClose(code)
  })

  return childProgress.pid
}

function kill(pid) {
  const childProgress = pidMap[pid]
  let status = false
  if (childProgress && !childProgress.killed) {
    status = childProgress.kill()
  }
  childProgress = null
  delete pidMap[pid]
  return status
}

module.exports = {
  start,
  kill,
}