users.js

const users = [];

const addUser = ({ id, name, room }) => {
    name = name.trim().toLowerCase();
    room = room.trim().toLowerCase();

    const existingUser = users.find(user => user.room === room && user.name === name);

    if (existingUser) {
        return { error: 'Username is taken' }
    }

    const user = { id, name, 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 = room => users.filter(user => user.room === room);

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