var allowedModes = [
  'q','a','o','h','v'
];

module.exports = (bot, trigger, lib) => {
  trigger.add({
    name: 'umode',
    call: /^\!umode .*/i,
    level: 100,
    active: 1,
    func: (e) => {
      var tmp = e.message.trim().split(' ');
      tmp.shift();
      var user = tmp[tmp.length - 1];
      if(!(user in e.channel.names))
        user = e.user.getNick();
      else
        tmp.pop();
      var modes;
      if(user.toLowerCase() != bot.me.nick.toLowerCase()) {
        if(modes = processModes(tmp.join(' '))) {
          if(checkModes(modes.give + modes.revoke, allowedModes)) {
            if(modes.give != "") bot.mode(e.channel, '+' + modes.give + ' ' + (user+' ').repeat(modes.give.length), e.network);
            if(modes.revoke != "") bot.mode(e.channel, '-' + modes.revoke + ' ' + (user+' ').repeat(modes.revoke.length), e.network);
          }
          else
            e.reply('Error! Allowed modes are: ' + allowedModes.join(','));
        }
        else
          e.reply('Syntax Error!');
      }
      else
        e.reply('f0ck you hard');
    },
    desc: 'change Usermodes'
  });
};

var processModes = (modes) => {
  var delta = true, give = [], revoke = [];
  modes.split('').forEach((token) => {
    if(token === '-') {delta = false; return;}
    if(token === '+') {delta = true; return;}
    if(token === ' ') return;
    if(delta) give.push(token);
    else revoke.push(token);
  });
  return {give: [...new Set(give)].join(''), revoke: [...new Set(revoke)].join('')};
};

var checkModes = (modes, allowedModes) => {
  if([...new Set(modes.split(''))].some((mode) => {
    return (allowedModes.indexOf(mode) != -1)?false:true;
  })) return false;
  return true;
};