centurion/backend/src/Lobby.js

const User = require("./User.js");

module.exports = class Lobby {
    /**
     * @type {User[]}
     */
    users = [];
    /**
     * @type {string|undefined}
     */
    leaderId = undefined;

    running = false;
    runningInterval = undefined;
    currentTime = 0;

    constructor(name) {
        this.name = name;
    }

    run() {
        this.running = true;
        this.runningInterval = setInterval(() => {
            this.currentTime += 1;
        }, 1000);
    }

    pause() {
        this.running = false;
        clearInterval(this.runningInterval);
    }

    /**
     *
     * @returns {boolean}
     */
    hasUsers() {
        return this.users.length !== 0;
    }


    setRandomLeader() {
        if (this.hasUsers()) {
            this.leaderId = this.users[0].id;
        }
    }

    /**
     *
     * @param {User} user
     */
    addUser(user) {
        this.users.push(user);
    }

    /**
     *
     * @param id
     * @returns {User|undefined}
     */
    getUser(id) {
        return this.users.find(u => u.id === id);
    }

    /**
     *
     * @param {string} id
     */
    removeUser(id) {
        this.users = this.users.filter(u => u.id !== id);
    }

    /**
     *
     * @returns {boolean}
     */
    hasLeader() {
        return !!this.leaderId;
    }

    /**
     *
     * @param {string} id
     * @returns {boolean}
     */
    isLeader(id) {
        return this.leaderId === id;
    }

    /**
     *
     * @param {string} id
     */
    setLeader(id) {
        if (!this.getUser(id)) {
            throw new Error('user_not_in_lobby');
        }

        this.leaderId = id;
    }

    /**
     *
     * @returns {User|undefined}
     */
    getLeader() {
        return this.users.find(u => u.id === this.leaderId)
    }
};