centurion/backend/src/service.js

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

/**
 *
 * @param {string} socketId
 * @param {number} lobbyId
 * @returns {Lobby}
 */
function joinLobby(socketId, lobbyId) {
    let lobby = state.getLobby(lobbyId);
    if (!lobby) {
        lobby = state.createLobby(lobbyId);
    }

    lobby.addUser(new User(socketId));

    if (!lobby.hasLeader()) {
        lobby.setLeader(socketId);
    }

    state.lobbies[lobby.name] = lobby;
    return lobby;
}

function leaveLobby(socketId) {
    Object.keys(state.lobbies).forEach(lobbyId => {
        const lobby = state.getLobby(lobbyId);

        if (!lobby) {
            return;
        }

        lobby.removeUser(socketId);

        if (!lobby.hasUsers()) {
            state.removeLobby(lobbyId);
            return;
        }

        if (lobby.getLeader() === socketId) {
            lobby.setRandomLeader();
        }
    });
}

/**
 *
 * @param socketId
 * @returns {Lobby|undefined}
 */
function getUserLobby(socketId) {
    for (let lobbyId of Object.keys(state.lobbies)) {
        const lobby = state.getLobby(lobbyId);

        if (!lobby) {
            continue;
        }

        if (lobby.getUser(socketId)) {
            return lobby;
        }
    }

    return undefined;
}

module.exports = {joinLobby, leaveLobby, getUserLobby};