users.js

const users = [];

const addUser = ({ id, userName, roomId, room }) => {

  name = userName.trim(); //.toLowerCase();
  roomId = roomId.trim();
  room = room.trim();
  
  const existingUser = users.find((user) => user.roomId === roomId && user.name === name);
  const existingUserInDifferentRoom = users.find((user) => user.name === name);

  if(!name || !roomId) return { error: 'Username and roomId are required.' };
  if(existingUser) return { error: 'Username is taken.' };
  //if(existingUserInDifferentRoom) return { error: 'You are already in a room.' };
  if(getUsersInRoom(roomId).length >= 10) return { error: 'Room already full' };

  const user = { id, name, roomId, room };

  users.push(user);
  
  return { user };
}

const removeUser = (id) => {
  const index = users.findIndex((user) => user.id === id);

  if(index !== -1) return users.splice(index, 1)[0];
}

const getUser = (id) => users.find((user) => user.id === id);

const getUsersInRoom = (roomId) => users.filter((user) => user.roomId === roomId);

module.exports = { addUser, removeUser, getUser, getUsersInRoom };