// :nickname!username@hostname command arg ume nts :trailing
// or
// :hostname command arg ume nts :trailing

function parseERROR (line) {
  let final = {
    user: { nickname: '', username: '', hostname: '' },
    command: 'ERROR',
    message: '',
    raw: line.join(' ')
  }

  let pass1 = line.slice(1).join(' ')
  if (pass1.indexOf(':') === 0) {
    pass1 = pass1.substring(1)
  }

  final.message = pass1

  return final
}

module.exports = function (rawline) {
  let final = {
    user: {
      nickname: '',
      username: '',
      hostname: ''
    },
    command: '',
    arguments: [],
    trailing: '',
    raw: rawline
  }

  let pass1 = (rawline.indexOf(':') === 0 ? rawline.substring(1).split(' ') : rawline.split(' '))
  if (pass1[0] === 'ERROR') return parseERROR(pass1)

  if (pass1[0].indexOf('!') !== -1) {
    let nickuser = pass1[0].split('!')
    final.user.nickname = nickuser[0]

    let userhost = nickuser[1].split('@')
    final.user.username = userhost[0]
    final.user.hostname = userhost[1]
  } else {
    final.user.hostname = pass1[0]
  }

  final.command = pass1[1]

  let pass2 = pass1.slice(2).join(' ')
  if (pass2.indexOf(':') !== -1) {
    final.arguments = pass2.substring(0, pass2.indexOf(' :')).split(' ')
    final.trailing = pass2.substring(pass2.indexOf(':') + 1)
  } else {
    final.arguments = pass2.split(' ')
  }

  return final
}