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

export interface IIRCUser {
  nickname: string;
  username: string;
  hostname: string;
}

export interface IIRCLine {
  user: IIRCUser;
  command: string;
  arguments?: string[];
  trailing?: string;
  raw: string;
}

function parseERROR(line: string[]): IIRCLine {
  let final: IIRCLine = {
    user: { nickname: '', username: '', hostname: '' },
    command: 'ERROR',
    trailing: '',
    raw: line.join(' ')
  };

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

  final.trailing = pass1;

  return final;
}

export function parse(rawline: string): IIRCLine {
  let final: IIRCLine = {
    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
}