/*
  Description: Changes the current channel of the calling socket
*/

// module main
exports.run = async (core, server, socket, data) => {
  // check for spam
  if (server.police.frisk(socket.remoteAddress, 6)) {
    return server.reply({
      cmd: 'warn',
      text: 'You are changing channels too fast. Wait a moment before trying again.'
    }, socket);
  }

  // check user input
  if (typeof data.channel !== 'string') {
    return;
  }

  if (data.channel === socket.channel) {
    // they are trying to rejoin the channel
    return;
  }

  // check that the nickname isn't already in target channel
  const currentNick = socket.nick.toLowerCase();
  let userExists = server.findSockets({
    channel: data.channel,
    nick: (targetNick) => targetNick.toLowerCase() === currentNick
  });

  if (userExists.length > 0) {
    // That nickname is already in that channel
    return;
  }

  // broadcast leave notice to peers
  let peerList = server.findSockets({ channel: socket.channel });

  if (peerList.length > 1) {
    for (let i = 0, l = peerList.length; i < l; i++) {
      server.reply({
        cmd: 'onlineRemove',
        nick: peerList[i].nick
      }, socket);

      if (socket.nick !== peerList[i].nick){
        server.reply({
          cmd: 'onlineRemove',
          nick: socket.nick
        }, peerList[i]);
      }
    }
  }

  // broadcast join notice to new peers
  let newPeerList = server.findSockets({ channel: data.channel });
  let moveAnnouncement = {
    cmd: 'onlineAdd',
    nick: socket.nick,
    trip: socket.trip || 'null',
    hash: socket.hash
  };
  let nicks = [];

  for (let i = 0, l = newPeerList.length; i < l; i++) {
    server.reply(moveAnnouncement, newPeerList[i]);
    nicks.push(newPeerList[i].nick);
  }

  nicks.push(socket.nick);

  // reply with new user list
  server.reply({
    cmd: 'onlineSet',
    nicks: nicks
  }, socket);

  // commit change
  socket.channel = data.channel;
};

// module meta
exports.requiredData = ['channel'];
exports.info = {
  name: 'move',
  description: 'This will change your current channel to the new one provided',
  usage: `
    API: { cmd: 'move', channel: '<target channel>' }`
};