centurion/backend/src/state.js

const Lobby = require("./lobby.js");
const User = require("./user.js");
const {getRandomInt} = require("./util.js");

class State {
    /**
     * @type {Object.<string, Lobby>}
     */
    lobbies = {};

    constructor() {
    }

    /**
     * @returns {Lobby}
     */
    createRandomLobby() {
        let lobby = undefined;

        while (!lobby) {
            const lobbyCount = Object.keys(this.lobbies).length;
            const id = getRandomInt(100, Math.max(1000, lobbyCount * 2));
            lobby = this.createLobby(id);
        }

        return lobby;
    }

    /**
     *
     * @param lobbyId
     * @returns {Lobby|undefined}
     */
    getLobby(lobbyId) {
        if (!lobbyId || !this.lobbies.hasOwnProperty(lobbyId)) {
            return undefined;
        }

        return this.lobbies[lobbyId];
    }

    /**
     * Returns undefined when the lobby already exists.
     * @param {number} lobbyId
     * @returns {Lobby|undefined}
     */
    createLobby(lobbyId) {
        if (this.lobbies.hasOwnProperty(lobbyId)) {
            return undefined;
        }

        return new Lobby(lobbyId);
    }

    removeLobby(lobbyId) {
        delete this.lobbies[lobbyId];
    }
}

module.exports = new State();