module.exports = (lib) => {
  lib.trigger.add({
    name: 'sync',
    call: /^!sync$/i,
    level: 100,
    active: 1,
    func: (e) => {
      lib.bot.names(e.channel, e.network, names => {
        Object.keys(names).forEach(key => {
          if(key === lib.bot.me.nick) {
            return;
          }
          lib.bot.whois(key, e.network, (err, data) => {
            if(data.channels[e.channel]) {
              var h = modesToString(data.channels[e.channel]), q = "";
              if(lib.admins[data.account])
                q = levelToModes(lib.admins[data.account].level);
              var diff = lib.groupUserModes(userModeDiff(h, q));
              diff.forEach(entry => lib.bot.mode(e.channel, entry + (' ' + key).repeat(entry.length - 1), e.network));
            }
          });
        });
      });
    },
    desc: 'sync'
  });
};

var userModeDiff = (h, q) => {
  var ret = [], index;
  while(h.length && q.length) {
    if((index = q.indexOf(h[h.length - 1])) !== -1)
      q = q.slice(0, index) + q.slice(index + 1);
    else
      ret.push('-' + h[h.length - 1]);
    h = h.slice(0, -1);
  }
  var sign = q.length ? '+' : '-';
  if(!q.length) q = h;
  if(index = q.length)
    while(index--)
      ret.push(sign + q[index]);
  return ret;
};

var levelToModes = level => {
  if(level >= 70)
    return "ao";
  if(level >= 60)
    return "o";
  if(level >= 50)
    return "h";
  if(level >= 10)
    return "v";
  return "";
};

var modesToString = modes => {
  var modeStr = "";
  modes.forEach(entry => {
    if(entry === "~")
      modeStr += "q";
    else if(entry === "&")
      modeStr += "a";
    else if(entry === "@")
      modeStr += "o";
    else if(entry === "%")
      modeStr += "h";
    else if(entry === "+")
      modeStr += "v";
  });
  return modeStr;
};