users.js

const users=[];

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

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

    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};