net-player.js

/*
 * Copyright 2015-2016 Christopher Brown and Jackie Niebling.
 *
 * This work is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License.
 *
 * To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to:
 *     Creative Commons
 *     PO Box 1866
 *     Mountain View
 *     CA 94042
 *     USA
 */
'use strict';

function createNetPlayer(game, socket, playerName) {
    var player = {
        name: playerName || 'Anonymous',
        onStateChange: onStateChange,
        onHistoryEvent: onHistoryEvent,
        onChatMessage: onChatMessage,
        onPlayerLeft: onPlayerLeft,
        playerId: socket.playerId
    };

    try {
        var gameProxy = game.playerJoined(player);
    } catch(e) {
        handleError(e);
        return;
    }

    function onStateChange(state) {
        socket.emit('state', state);
    }

    function onChatMessage(playerIdx, message) {
        socket.emit('chat', {
            from: playerIdx,
            message: message
        });
    }

    function onHistoryEvent(message, type, histGroup) {
        socket.emit('history', {
            message: message,
            type: type,
            histGroup: histGroup
        });
    }

    function onCommand(data) {
        try {
            if (gameProxy != null) {
                gameProxy.command(data);
            }
        } catch(e) {
            handleError(e);
        }
    }

    function sendChatMessage(message) {
        if (gameProxy != null) {
            gameProxy.sendChatMessage(message);
        }
    }

    function onPlayerLeft() {
        socket.removeListener('command', onCommand);
        socket.removeListener('chat', sendChatMessage);
        socket.removeListener('disconnect', leaveGame);
        socket.removeListener('join', leaveGame);
        setTimeout(function () {
            socket.emit('state', null);
        });
    }

    function leaveGame() {
        if (gameProxy != null) {
            gameProxy.playerLeft();
            gameProxy = null;
            game = null;
        }
    }

    socket.on('command', onCommand);
    socket.on('chat', sendChatMessage);
    socket.on('disconnect', leaveGame);
    // If the player joins another game, leave this one.
    socket.on('join', leaveGame);

    function handleError(e) {
        var message;
        if (e instanceof Error) {
            console.error(e);
            console.error(e.stack);
            message = 'Internal error';
        } else {
            message = e.message;
        }
        socket.emit('game-error', message);
    }
}

module.exports = createNetPlayer;