Merge pull request 'MAPG-226 change remaining time calculation' (#21) from feature/MAPG-226-change-timeout-algorithm into develop

Reviewed-on: https://gitea.e5tv.hu/esoko/mapguesser/pulls/21

.env.example

@@ -15,3 +15,7 @@ MAIL_PORT=2500
 GOOGLE_OAUTH_CLIENT_ID=your_google_oauth_client_id
 GOOGLE_OAUTH_CLIENT_SECRET=your_google_oauth_client_secret
 GOOGLE_ANALITICS_ID=your_google_analytics_id
+MULTI_INTERNAL_HOST=multi
+MULTI_INTERNAL_PORT=5000
+MULTI_WS_URL=mapguesser-dev.ch:8090
+MULTI_WS_PORT=8090

.gitignore

@@ -1,4 +1,4 @@
 .env
 installed
-unit_test_results.xml
 vendor
+node_modules

.vscode/launch.json

@@ -9,6 +9,14 @@
             "pathMappings": {
                 "/var/www/mapguesser": "${workspaceRoot}",
             }
+        },
+        {
+            "name": "Listen for NodeJS Inspector in Docker",
+            "type": "node",
+            "request": "attach",
+            "port": 9229,
+            "localRoot": "${workspaceFolder}",
+            "remoteRoot": "/var/www/mapguesser"
         }
     ]
 }

README.md

@@ -9,7 +9,7 @@ This is the MapGuesser Application project. This is a game about guessing where
 The first step is obviously cloning the repository to your machine:
 
 ```
-git clone https://bitbucket.org/esoko/mapguesser.git
+git clone https://gitea.e5tv.hu/esoko/mapguesser.git
 ```
 
 All the commands listed here should be executed from the repository root.

bitbucket-pipelines.yml

@@ -17,8 +17,10 @@ pipelines:
               name: Static Code Analysis
               caches:
                   - composer
+              artifacts:
+                  - static_code_analysis_results.json
               script:
                   - apt-get update && apt-get install -y unzip
                   - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
                   - composer install
-                  - vendor/bin/phpstan analyse -c phpstan.neon
+                  - php -d memory_limit=1G vendor/bin/phpstan analyse -c phpstan.neon --error-format=prettyJson > static_code_analysis_results.json

composer.json

@@ -6,7 +6,8 @@
   "require": {
     "vlucas/phpdotenv": "^4.1",
     "symfony/console": "^5.1",
-    "phpmailer/phpmailer": "^6.1"
+    "phpmailer/phpmailer": "^6.1",
+    "fzaninotto/faker": "^1.9"
   },
   "require-dev": {
     "phpunit/phpunit": "^9",

composer.lock

@@ -4,8 +4,63 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "34563bfc619f47473b2e37a5639dd63e",
+    "content-hash": "b71c0ffc0761a6b90f6242346b735a09",
     "packages": [
+        {
+            "name": "fzaninotto/faker",
+            "version": "v1.9.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/fzaninotto/Faker.git",
+                "reference": "848d8125239d7dbf8ab25cb7f054f1a630e68c2e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/fzaninotto/Faker/zipball/848d8125239d7dbf8ab25cb7f054f1a630e68c2e",
+                "reference": "848d8125239d7dbf8ab25cb7f054f1a630e68c2e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "ext-intl": "*",
+                "phpunit/phpunit": "^4.8.35 || ^5.7",
+                "squizlabs/php_codesniffer": "^2.9.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Faker\\": "src/Faker/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "François Zaninotto"
+                }
+            ],
+            "description": "Faker is a PHP library that generates fake data for you.",
+            "keywords": [
+                "data",
+                "faker",
+                "fixtures"
+            ],
+            "support": {
+                "issues": "https://github.com/fzaninotto/Faker/issues",
+                "source": "https://github.com/fzaninotto/Faker/tree/v1.9.2"
+            },
+            "abandoned": true,
+            "time": "2020-12-11T09:56:16+00:00"
+        },
         {
             "name": "phpmailer/phpmailer",
             "version": "v6.1.6",
@@ -2710,5 +2765,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "1.1.0"
+    "plugin-api-version": "2.0.0"
 }

database/migrations/structure/20210318_2136_multiplayer.sql

@@ -0,0 +1,9 @@
+CREATE TABLE `multi_rooms` (
+  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
+  `room_id` varchar(6) NOT NULL,
+  `state` text NOT NULL,
+  `members` text NOT NULL,
+  `updated` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `room_id` (`room_id`)
+) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4;

docker-compose.yml

@@ -1,14 +1,23 @@
 version: '3'
 services:
     app:
-        build: ./docker
+        build:
+            context: ./docker
+            dockerfile: Dockerfile-app
         ports:
             - 80:80
         volumes:
             - .:/var/www/mapguesser
-        links:
-            - 'mariadb'
-            - 'mail'
+    multi:
+        build:
+            context: ./docker
+            dockerfile: Dockerfile-multi
+        ports:
+            - 5000:5000
+            - 8090:8090
+            - 9229:9229
+        volumes:
+            - .:/var/www/mapguesser
     mariadb:
         image: mariadb:10.3
         ports:

docker/Dockerfile-multi

@@ -0,0 +1,16 @@
+FROM ubuntu:focal
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Install necessary packages
+RUN apt update --fix-missing
+RUN apt install -y curl build-essential
+
+# Install Node.js and required packages
+RUN curl -sL https://deb.nodesource.com/setup_14.x | bash -
+RUN apt install -y nodejs
+
+VOLUME /var/www/mapguesser
+WORKDIR /var/www/mapguesser
+
+ENTRYPOINT /usr/bin/node --inspect=0.0.0.0:9229 multi

multi/index.js

@@ -0,0 +1,369 @@
+'use strict';
+
+process.title = 'mapguesser-multi';
+
+class MultiGame {
+    static ROUND_TIMEOUT_DEFAULT = 120000;
+    static ROUND_TIMEOUT_MINIMUM = 15000;
+    static ROUND_TIMEOUT_DIVIDER = 1.5;
+    static ROUND_TIMEOUT_OFFSET = 500;
+
+    constructor() {
+        this.rooms = new Map();
+    }
+
+    cleanupRooms() {
+        this.rooms.forEach(function (room, roomId) {
+            var lastValidDate = new Date(new Date().getTime() - 7 * 24 * 60 * 60 * 1000);
+
+            if (room.updated < lastValidDate) {
+                this.rooms.delete(roomId);
+            }
+        });
+    }
+
+    connectToRoom(roomId, token, connection) {
+        if (!this.rooms.has(roomId) || !this.rooms.get(roomId).members.has(token)) {
+            return;
+        }
+
+        var room = this.rooms.get(roomId)
+        var member = room.members.get(token);
+        member.connection = connection;
+
+        this._sendInitialData(room, member, token);
+    }
+
+    createRoom(roomId) {
+        this.rooms.set(roomId, { members: new Map(), rounds: [], currentRound: -1, updated: new Date() });
+
+        return { ok: true };
+    }
+
+    joinRoom(roomId, token, userName) {
+        if (!this.rooms.has(roomId)) {
+            return { error: 'room_not_found' };
+        }
+
+        var room = this.rooms.get(roomId);
+        room.updated = new Date();
+
+        if (room.members.has(token)) {
+            return { error: 'member_already_joined' };
+        }
+
+        var data = { userName: userName };
+        var self = this;
+        room.members.forEach(function (member) {
+            self._sendToMember(member, 'member_joined', data);
+        });
+
+        room.members.set(token, { userName: userName, connection: null });
+
+        return { ok: true };
+    }
+
+    startGame(roomId, places) {
+        if (!this.rooms.has(roomId)) {
+            return { error: 'room_not_found' };
+        }
+
+        var room = this.rooms.get(roomId);
+        room.updated = new Date();
+
+        var rounds = [];
+        places.forEach(function (place) {
+            rounds.push({
+                place: place,
+                results: new Map(),
+                timeout: MultiGame.ROUND_TIMEOUT_DEFAULT,
+                timeoutStarted: null,
+                timeoutHandler: null
+            })
+        });
+
+        room.rounds = rounds;
+
+        this.nextRound(roomId, 0);
+
+        return { ok: true };
+    }
+
+    guess(roomId, token, guessPosition, distance, score) {
+        if (!this.rooms.has(roomId)) {
+            return { error: 'room_not_found' };
+        }
+
+        var room = this.rooms.get(roomId);
+        room.updated = new Date();
+
+        var round = room.rounds[room.currentRound];
+        if (round.results.has(token)) {
+            return { error: 'already_guessed' };
+        }
+
+        var member = room.members.get(token);
+        var allResults = this._collectResultsInRound(room, round);
+
+        this._broadcastGuess(room, member.userName, guessPosition, distance, score);
+
+        round.results.set(token, { guessPosition: guessPosition, distance: distance, score: score });
+
+        this._setNewTimeout(room, round);
+
+        return { allResults: allResults };
+    }
+
+    nextRound(roomId, currentRound) {
+        if (!this.rooms.has(roomId)) {
+            return { error: 'room_not_found' };
+        }
+
+        var room = this.rooms.get(roomId);
+        room.updated = new Date();
+
+        room.currentRound = currentRound;
+
+        var round = room.rounds[room.currentRound];
+
+        round.timeoutStarted = new Date();
+        var self = this;
+        round.timeoutHandler = setTimeout(function () {
+            self._endRound(room, round);
+        }, round.timeout + MultiGame.ROUND_TIMEOUT_OFFSET);
+
+        var data = {};
+        data.place = { panoId: round.place.panoId, pov: round.place.pov };
+        data.timeout = round.timeout;
+
+        var self = this;
+        room.members.forEach(function (member) {
+            self._sendToMember(member, 'new_round', data);
+        });
+
+        return { ok: true };
+    }
+
+    _setNewTimeout(room, round) {
+        clearTimeout(round.timeoutHandler);
+
+        if (room.members.size === round.results.size) {
+            round.timeout = 0;
+            round.timeoutStarted = new Date();
+
+            this._endRound(room, round);
+        } else {
+            round.timeout = round.timeout - (new Date() - round.timeoutStarted);
+            if (round.timeout > MultiGame.ROUND_TIMEOUT_DIVIDER * MultiGame.ROUND_TIMEOUT_MINIMUM) {
+                round.timeout = Math.round(round.timeout / MultiGame.ROUND_TIMEOUT_DIVIDER);
+            } else if (round.timeout > MultiGame.ROUND_TIMEOUT_MINIMUM) {
+                round.timeout = MultiGame.ROUND_TIMEOUT_MINIMUM;
+            }
+            round.timeoutStarted = new Date();
+            var self = this;
+            round.timeoutHandler = setTimeout(function () {
+                self._endRound(room, round);
+            }, round.timeout + MultiGame.ROUND_TIMEOUT_OFFSET);
+
+            this._broadcastTimeout(room, round);
+        }
+    }
+
+    _endRound(room, round) {
+        var allResults = this._collectResultsInRound(room, round);
+        var self = this;
+        room.members.forEach(function (member, token) {
+            var result = { guessPosition: null, distance: null, score: 0 };
+
+            if (round.results.has(token)) {
+                result = round.results.get(token);
+            } else {
+                round.results.set(token, result);
+            }
+
+            var data = { position: round.place.position, result: result, allResults: allResults };
+            self._sendToMember(member, 'end_round', data);
+        });
+    }
+
+    _sendInitialData(room, member, token) {
+        var data = {};
+
+        if (room.currentRound >= 0) {
+            var round = room.rounds[room.currentRound];
+
+            data.place = round.place;
+            data.timeout = round.timeout - (new Date() - round.timeoutStarted);
+        }
+
+        data.history = [];
+        for (var i = 0; i <= room.currentRound; ++i) {
+            var round = room.rounds[i];
+
+            if (i === room.currentRound && !round.results.has(token)) {
+                continue;
+            }
+
+            var result = { guessPosition: null, distance: null, score: 0 };
+            var allResults = [];
+
+            round.results.forEach(function (currentResult, currentToken) {
+                if (token === currentToken) {
+                    result = currentResult;
+                    return;
+                }
+
+                allResults.push({ userName: room.members.get(currentToken).userName, guessPosition: currentResult.guessPosition, distance: currentResult.distance, score: currentResult.score });
+            });
+
+            data.history.push({
+                position: round.place.position,
+                result: result,
+                allResults: allResults
+            });
+        }
+
+        data.members = [];
+        room.members.forEach(function (currentMember) {
+            data.members.push({ userName: currentMember.userName, me: member === currentMember });
+        });
+
+        data.readyToContinue = room.currentRound >= 0 && room.members.size === room.rounds[room.currentRound].results.size
+
+        this._sendToMember(member, 'initialize', data);
+    }
+
+    _collectResultsInRound(room, round) {
+        var results = [];
+        round.results.forEach(function (result, token) {
+            results.push({
+                userName: room.members.get(token).userName,
+                guessPosition: result.guessPosition,
+                distance: result.distance,
+                score: result.score
+            });
+        });
+
+        return results;
+    }
+
+    _broadcastTimeout(room, round) {
+        var self = this;
+        room.members.forEach(function (member) {
+            self._sendToMember(member, 'timeout_changed', { timeout: round.timeout });
+        });
+    }
+
+    _broadcastGuess(room, userName, guessPosition, distance, score) {
+        var data = { userName: userName, guessPosition: guessPosition, distance: distance, score: score };
+        var round = room.rounds[room.currentRound];
+        var self = this;
+        room.members.forEach(function (member, token) {
+            if (!round.results.has(token)) {
+                return;
+            }
+
+            self._sendToMember(member, 'guess', data);
+        });
+    }
+
+    _sendToMember(member, type, data) {
+        if (!member.connection) {
+            return;
+        }
+
+        if (member.connection.readyState !== ws.OPEN) {
+            member.connection = null;
+            return;
+        }
+
+        member.connection.send(JSON.stringify({ type: type, data: data }));
+    }
+}
+
+require('dotenv').config();
+
+var
+    net = require('net'),
+    ws = require('ws');
+
+var multiGame = new MultiGame();
+
+//TODO: following should be in a separate class/function
+
+var tcpServer = net.createServer(function (socket) {
+    socket.on('data', function (data) {
+        try {
+            data = JSON.parse(data);
+        } catch (e) {
+            console.error('Cannot parse data: ' + data);
+            return;
+        }
+
+        var response;
+        switch (data.func) {
+            case 'create_room':
+                response = multiGame.createRoom(data.args.roomId);
+
+                break;
+
+            case 'join_room':
+                response = multiGame.joinRoom(data.args.roomId, data.args.token, data.args.userName);
+
+                break;
+
+            case 'start_game':
+                response = multiGame.startGame(data.args.roomId, data.args.places);
+
+                break
+
+            case 'guess':
+                response = multiGame.guess(data.args.roomId, data.args.token, data.args.guessPosition, data.args.distance, data.args.score);
+
+                break;
+
+            case 'next_round':
+                response = multiGame.nextRound(data.args.roomId, data.args.currentRound);
+
+                break;
+        }
+
+        socket.write(JSON.stringify(response));
+        socket.end();
+    });
+});
+tcpServer.on('listening', function () {
+    console.log('[INFO] TCP server started');
+});
+tcpServer.listen(process.env.MULTI_INTERNAL_PORT);
+
+var wsServer = new ws.Server({ port: process.env.MULTI_WS_PORT });
+wsServer.on('connection', function (connection, request) {
+    console.log('[INFO] New WS connection: ' + request.connection.remoteAddress);
+
+    connection.on('message', function (data) {
+        try {
+            data = JSON.parse(data);
+        } catch (e) {
+            console.error('Cannot parse data: ' + data);
+            return;
+        }
+
+        switch (data.func) {
+            case 'connect_to_room':
+                multiGame.connectToRoom(data.args.roomId, data.args.token, connection);
+                break;
+        }
+    });
+
+    connection.on('close', function () {
+        console.log('[INFO] WS connection ended: ' + request.connection.remoteAddress);
+    });
+});
+wsServer.on('listening', function () {
+    console.log('[INFO] WS server started');
+});
+
+setInterval(function () {
+    multiGame.cleanupRooms();
+}, 24 * 60 * 60 * 1000);

multi/package-lock.json

@@ -0,0 +1,17 @@
+{
+    "name": "mapguesser-multi",
+    "requires": true,
+    "lockfileVersion": 1,
+    "dependencies": {
+        "dotenv": {
+            "version": "8.2.0",
+            "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-8.2.0.tgz",
+            "integrity": "sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw=="
+        },
+        "ws": {
+            "version": "7.4.4",
+            "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.4.tgz",
+            "integrity": "sha512-Qm8k8ojNQIMx7S+Zp8u/uHOx7Qazv3Yv4q68MiWWWOJhiwG5W3x7iqmRtJo8xxrciZUY4vRxUTJCKuRnF28ZZw=="
+        }
+    }
+}

multi/package.json

@@ -0,0 +1,13 @@
+{
+    "name": "mapguesser-multi",
+    "version": "",
+    "description": "MapGuesser Application - Multiplayer",
+    "main": "index.js",
+    "dependencies": {
+        "dotenv": "^8.2.0",
+        "ws": "^7.4.4"
+    },
+    "scripts": {},
+    "author": "Pőcze Bence <bence@pocze.ch>",
+    "license": "GNU AGPL 3.0"
+}

public/static/css/game.css

@@ -79,7 +79,7 @@
     line-height: 1;
 }
 
-#distanceInfo>p:nth-child(2), #scoreInfo>p:nth-child(2) {
+#distanceInfo>p:nth-child(2), #distanceInfo>p:nth-child(3), #scoreInfo>p:nth-child(2) {
     display: none;
 }
 
@@ -102,6 +102,53 @@
     display: none;
 }
 
+#startMultiGameButton {
+    display: none;
+}
+
+#players > p {
+    font-size: 14px;
+    font-weight: bold;
+}
+
+#countdown {
+    position: absolute;
+    top: 5px;
+    right: 5px;
+    height: 28px;
+    line-height: 28px;
+    padding: 0 8px;
+    background-color: #eeeeee;
+    border: solid 1px #555555;
+    border-radius: 3px;
+    opacity: 0.95;
+    z-index: 5;
+    visibility: hidden;
+}
+
+#countdown.yellow {
+    background-color: #f7c789;
+    border: solid 1px #e8a349;
+}
+
+#countdown.red {
+    background-color: #f7a5a5;
+    border: solid 1px #aa5e5e;
+}
+
+#countdown p {
+    font-size: 16px;
+    line-height: inherit;
+}
+
+#countdown.yellow p {
+    color: #9c4308;
+}
+
+#countdown.red p {
+    color: #701919;
+}
+
 @media screen and (max-width: 599px) {
     #mapName {
         display: none;

public/static/css/mapguesser.css

@@ -404,9 +404,17 @@ div.buttonContainer>button {
 }
 
 #cookiesNotice {
+    position: fixed;
+    left: 0;
+    bottom: 0;
+    right: 0;
+    margin: 20px;
     background-color: #eeeeee;
+    border: solid #888888 1px;
+    border-radius: 3px;
     padding: 10px;
     text-align: center;
+    z-index: 10;
 }
 
 #loading {

public/static/img/markers/marker-blue-empty.svg

@@ -0,0 +1,10 @@
+<!-- Original image: Copyright (c) 2019 The Bootstrap Authors. License can be found in 'USED_SOFTWARE' in section 'Bootstrap Icons'. -->
+<svg viewBox="0 0 12 16" xmlns="http://www.w3.org/2000/svg">
+    <path
+        fill="#3183ce"
+        fill-rule="evenodd"
+        stroke="#19456d"
+        stroke-width="0.3"
+        stroke-linecap="round"
+        d="m 5.9999998,15.849652 c 0,0 5.8511182,-5.579947 5.8511182,-9.8134832 a 5.8511179,5.8880898 0 0 0 -11.7022358,0 c 0,4.2335362 5.8511176,9.8134832 5.8511176,9.8134832" />
+</svg>

public/static/js/game.js

@@ -5,6 +5,8 @@
         NUMBER_OF_ROUNDS: 5,
         MAX_SCORE: 1000,
 
+        mapBounds: null,
+        multi: { token: null, owner: false },
         rounds: [],
         scoreSum: 0,
         panoId: null,
@@ -15,41 +17,279 @@
         adaptGuess: false,
         googleLink: null,
 
-        initialize: function () {
+        readyToContinue: false,
+        timeoutEnd: null,
+        countdownHandler: null,
+
+        MultiConnector: {
+            connection: null,
+            reconnectCounter: 0,
+
+            connect: function () {
+                if (Game.MultiConnector.connection && Game.MultiConnector.connection.readyState !== WebSocket.CLOSED) {
+                    return;
+                }
+
+                Game.MultiConnector.connection = new WebSocket((MapGuesser.isSecure ? 'wss' : 'ws') + '://' + multiUrl);
+
+                Game.MultiConnector.connection.onopen = function () {
+                    document.getElementById('loading').style.visibility = 'hidden';
+                    Game.MultiConnector.reconnectCounter = 0;
+                    Game.MultiConnector.connection.send(JSON.stringify({ func: 'connect_to_room', args: { roomId: roomId, token: Game.multi.token } }));
+                };
+
+                Game.MultiConnector.connection.onclose = Game.MultiConnector.noConnection;
+
+                Game.MultiConnector.connection.onerror = function (event) {
+                    console.error('WebSocket error in Game.MultiConnector:', event);
+                };
+
+                Game.MultiConnector.connection.onmessage = function (message) {
+                    var json;
+
+                    try {
+                        json = JSON.parse(message.data);
+                    } catch (e) {
+                        console.error('Cannot parse message!');
+                        console.error(message.data);
+                        return;
+                    }
+
+                    switch (json.type) {
+                        case 'initialize':
+                            Game.MultiConnector.initialize(json.data);
+                            break;
+
+                        case 'member_joined':
+                            Game.MultiConnector.memberJoined(json.data);
+                            break;
+
+                        case 'new_round':
+                            Game.MultiConnector.newRound(json.data);
+                            break;
+
+                        case 'guess':
+                            Game.MultiConnector.guess(json.data);
+                            break;
+
+                        case 'timeout_changed':
+                            Game.MultiConnector.timeoutChanged(json.data);
+                            break;
+
+                        case 'end_round':
+                            Game.MultiConnector.endRound(json.data);
+                            break;
+                    }
+                };
+            },
+
+            noConnection: function () {
+                if (Game.MultiConnector.reconnectCounter === 2) {
+                    console.error('Could not reconnect WebSocket for Game.MultiConnector...')
+                }
+
+                setTimeout(function () {
+                    Game.MultiConnector.reconnectCounter++;
+
+                    console.log('Reconnecting WebSocket for Game.MultiConnector... ' + Game.MultiConnector.reconnectCounter);
+                    Game.MultiConnector.connect();
+                }, 1000 + Math.min(Game.MultiConnector.reconnectCounter * 500, 9000));
+            },
+
+            initialize: function (data) {
+                if (data.history.length === 0 && !data.place) {
+                    var div = document.getElementById('players');
+
+                    for (var i = 0; i < data.members.length; ++i) {
+                        var member = data.members[i];
+
+                        var p = document.createElement('p');
+                        p.innerHTML = member.userName + (member.me ? ' (me)' : '');
+                        div.appendChild(p);
+                    }
+                }
+
+                for (var i = 0; i < data.history.length; ++i) {
+                    var round = data.history[i];
+                    Game.rounds.push({ position: round.position, guessPosition: round.result.guessPosition, realMarker: null, guessMarkers: [] });
+                    Game.addPositionToResultMap(true);
+                    if (round.result.guessPosition) {
+                        Game.addGuessPositionToResultMap(round.result.guessPosition, null, true);
+                    }
+                    Game.scoreSum += round.result.score;
+
+                    for (var j = 0; j < round.allResults.length; ++j) {
+                        var result = round.allResults[j];
+                        if (result.guessPosition) {
+                            Game.addGuessPositionToResultMap(result.guessPosition, result, true);
+                        }
+                    }
+                }
+
+                document.getElementById('currentRound').innerHTML = String(Game.rounds.length) + '/' + String(Game.NUMBER_OF_ROUNDS);
+                document.getElementById('currentScoreSum').innerHTML = String(Game.scoreSum) + '/' + String(Game.rounds.length * Game.MAX_SCORE);
+
+                if (data.timeout) {
+                    Game.startCountdown(data.timeout);
+                }
+
+                if (data.place) {
+                    Game.readyToContinue = data.readyToContinue;
+                    Game.panoId = data.place.panoId;
+                    Game.pov = data.place.pov;
+
+                    document.getElementById('multi').style.visibility = 'hidden';
+
+                    if (Game.rounds.length === 0 || !Game.rounds[Game.rounds.length - 1].position) {
+                        document.getElementById('panoCover').style.visibility = 'hidden';
+                        Game.startNewRound();
+                    } else {
+                        Game.loadPano(Game.panoId, Game.pov);
+                        Game.showResultFromHistory(data.history[data.history.length - 1].result);
+                    }
+                }
+
+                document.getElementById('loading').style.visibility = 'hidden';
+            },
+
+            memberJoined: function (data) {
+                var div = document.getElementById('players');
+
+                var p = document.createElement('p');
+                p.innerHTML = data.userName;
+                div.appendChild(p);
+            },
+
+            newRound: function (data) {
+                if (Game.rounds.length === Game.NUMBER_OF_ROUNDS) {
+                    Game.reset();
+                }
+
+                Game.readyToContinue = false;
+                Game.panoId = data.place.panoId;
+                Game.pov = data.place.pov;
+
+                document.getElementById('multi').style.visibility = 'hidden';
+                Game.resetRound();
+                Game.startNewRound();
+
+                Game.startCountdown(data.timeout);
+            },
+
+            guess: function (data) {
+                var resultBounds = Game.map.getBounds();
+
+                Game.addGuessPositionToResultMap(data.guessPosition, data);
+                resultBounds.extend(data.guessPosition);
+
+                Game.map.fitBounds(resultBounds);
+            },
+
+            timeoutChanged: function (data) {
+                Game.startCountdown(data.timeout);
+            },
+
+            endRound: function (data) {
+                Game.readyToContinue = true;
+                Game.startCountdown(0);
+
+                if (Game.rounds[Game.rounds.length - 1].guessPosition || Game.rounds[Game.rounds.length - 1].position) {
+                    if (Game.multi.owner) {
+                        document.getElementById('continueButton').disabled = false;
+                        document.getElementById('startNewGameButton').disabled = false;
+                    }
+
+                    return;
+                }
+
+                document.getElementById('guessButton').disabled = true;
+                document.getElementById('panoCover').style.visibility = 'visible';
+
+                Game.receiveResult(data.position, data.result.guessPosition, { distance: data.result.distance, score: data.result.score }, data.allResults);
+            }
+        },
+
+        prepare: function () {
+            var data = new FormData();
+            var userNames;
+
+            if (roomId) {
+                var userNames = localStorage.userNames ? JSON.parse(localStorage.userNames) : {};
+                if (!userNames.hasOwnProperty(roomId)) {
+                    userNames[roomId] = prompt('Your name: ');
+                    localStorage.userNames = JSON.stringify(userNames);
+                }
+
+                data.append('userName', userNames[roomId]);
+            }
+
             document.getElementById('loading').style.visibility = 'visible';
+            var url = roomId ? '/multiGame/' + roomId + '/prepare.json' : '/game/' + mapId + '/prepare.json';
+            MapGuesser.httpRequest('POST', url, function () {
+                document.getElementById('loading').style.visibility = 'hidden';
+
+                if (this.response.error) {
+                    Game.handleErrorResponse(this.response.error);
+                    return;
+                }
+
+                document.getElementById('mapName').innerHTML = this.response.mapName;
+                Game.mapBounds = this.response.bounds;
+
+                Game.initialize();
+
+                if (roomId) {
+                    Game.multi.token = this.response.token;
+                    Game.multi.owner = this.response.owner;
+
+                    document.getElementById('multi').style.visibility = 'visible';
+                    if (Game.multi.owner) {
+                        document.getElementById('startMultiGameButton').style.display = 'block';
+                    }
+
+                    document.getElementById('loading').style.visibility = 'visible';
+                    Game.MultiConnector.connect();
+                }
+            }, data);
+        },
+
+        initialize: function () {
             document.getElementById('panoCover').style.visibility = 'visible';
-            document.getElementById('currentRound').innerHTML = '1/' + String(Game.NUMBER_OF_ROUNDS);
-            document.getElementById('currentScoreSum').innerHTML = '0/0';
 
             Game.map.setOptions({
                 draggableCursor: 'crosshair'
             });
-            Game.map.fitBounds(mapBounds);
+            Game.map.fitBounds(Game.mapBounds);
 
-            MapGuesser.httpRequest('GET', '/game/' + mapId + '/newPlace.json', function () {
+            if (roomId) {
+                // if it is multiplayer mode, data is sent via WS
+                return;
+            }
+
+            document.getElementById('loading').style.visibility = 'visible';
+            MapGuesser.httpRequest('POST', '/game/' + mapId + '/initialData.json', function () {
                 document.getElementById('loading').style.visibility = 'hidden';
                 document.getElementById('panoCover').style.visibility = 'hidden';
 
                 if (this.response.error) {
-                    //TODO: handle this error
+                    Game.handleErrorResponse(this.response.error);
                     return;
                 }
 
-                Game.panoId = this.response.panoId;
-                Game.pov = this.response.pov;
+                Game.panoId = this.response.place.panoId;
+                Game.pov = this.response.place.pov;
 
-                if (this.response.history) {
-                    for (var i = 0; i < this.response.history.length; ++i) {
-                        var round = this.response.history[i];
-                        Game.rounds.push({ position: round.position, guessPosition: round.guessPosition, realMarker: null, guessMarker: null, line: null });
-                        Game.addRealGuessPair(round.position, round.guessPosition, true);
-                        Game.scoreSum += round.score;
-                    }
-
-                    document.getElementById('currentRound').innerHTML = String(Game.rounds.length) + '/' + String(Game.NUMBER_OF_ROUNDS);
-                    document.getElementById('currentScoreSum').innerHTML = String(Game.scoreSum) + '/' + String(Game.rounds.length * Game.MAX_SCORE);
+                for (var i = 0; i < this.response.history.length; ++i) {
+                    var round = this.response.history[i];
+                    Game.rounds.push({ position: round.position, guessPosition: round.result.guessPosition, realMarker: null, guessMarkers: [] });
+                    Game.addPositionToResultMap(true);
+                    Game.addGuessPositionToResultMap(round.result.guessPosition, null, true);
+                    Game.scoreSum += round.result.score;
                 }
 
+                document.getElementById('currentRound').innerHTML = String(Game.rounds.length) + '/' + String(Game.NUMBER_OF_ROUNDS);
+                document.getElementById('currentScoreSum').innerHTML = String(Game.scoreSum) + '/' + String(Game.rounds.length * Game.MAX_SCORE);
+
                 Game.startNewRound();
             });
         },
@@ -63,10 +303,16 @@
             for (var i = 0; i < Game.rounds.length; ++i) {
                 var round = Game.rounds[i];
 
-                if (round.realMarker && round.guessMarker && round.line) {
+                if (round.realMarker) {
                     round.realMarker.setMap(null);
-                    round.guessMarker.setMap(null);
-                    round.line.setMap(null);
+                }
+                for (var j = 0; j < round.guessMarkers.length; ++j) {
+                    var guessMarker = round.guessMarkers[j];
+                    guessMarker.marker.setMap(null);
+                    guessMarker.line.setMap(null);
+                    if (guessMarker.info) {
+                        guessMarker.info.close();
+                    }
                 }
             }
 
@@ -76,10 +322,12 @@
             var distanceInfo = document.getElementById('distanceInfo');
             distanceInfo.children[0].style.display = null;
             distanceInfo.children[1].style.display = null;
+            distanceInfo.children[2].style.display = null;
             var scoreInfo = document.getElementById('scoreInfo');
             scoreInfo.children[0].style.display = null;
             scoreInfo.children[1].style.display = null;
             document.getElementById('continueButton').style.display = null;
+            document.getElementById('showSummaryButton').style.display = null;
             document.getElementById('startNewGameButton').style.display = null;
 
             document.getElementById('showGuessButton').style.visibility = null;
@@ -96,8 +344,15 @@
                 var lastRound = Game.rounds[Game.rounds.length - 1];
 
                 lastRound.realMarker.setVisible(false);
-                lastRound.guessMarker.setVisible(false);
-                lastRound.line.setVisible(false);
+                for (var i = 0; i < lastRound.guessMarkers.length; ++i) {
+                    var guessMarker = lastRound.guessMarkers[i];
+                    guessMarker.marker.setVisible(false);
+                    guessMarker.line.setVisible(false);
+                    if (guessMarker.info) {
+                        guessMarker.info.close();
+                    }
+                }
+
             }
 
             document.getElementById('panoCover').style.visibility = 'hidden';
@@ -108,13 +363,18 @@
             Game.map.setOptions({
                 draggableCursor: 'crosshair'
             });
-            Game.map.fitBounds(mapBounds);
+            Game.map.fitBounds(Game.mapBounds);
+
+            if (roomId) {
+                // if it is multiplayer mode, data is sent via WS
+                return;
+            }
 
             Game.startNewRound();
         },
 
         startNewRound: function () {
-            Game.rounds.push({ position: null, guessPosition: null, realMarker: null, guessMarker: null, line: null });
+            Game.rounds.push({ position: null, guessPosition: null, realMarker: null, guessMarkers: [] });
 
             document.getElementById('currentRound').innerHTML = String(Game.rounds.length) + '/' + String(Game.NUMBER_OF_ROUNDS);
 
@@ -122,13 +382,26 @@
         },
 
         handleErrorResponse: function (error) {
-            // for the time being we only handle the "no_session_found" error and reset the game
+            switch (error) {
+                case 'no_session_found':
+                    MapGuesser.showModalWithContent('Error', 'Your session is invalid!', [{
+                        type: 'button',
+                        classNames: [],
+                        text: 'Restart game',
+                        onclick: function () {
+                            window.location.reload();
+                        }
+                    }]);
+                    break;
 
-            MapGuesser.httpRequest('GET', '/game/' + mapId + '/json', function () {
-                mapBounds = this.response.bounds;
+                case 'game_already_started':
+                    MapGuesser.showModalWithContent('Error', 'This game is already started, you cannot join.');
+                    break;
 
-                Game.reset();
-            });
+                default:
+                    MapGuesser.showModalWithContent('Error', 'Error code: \'' + error + '\'');
+                    break
+            }
         },
 
         loadPano: function (panoId, pov) {
@@ -141,7 +414,106 @@
             Game.panorama.setPano(panoId);
         },
 
-        evaluateGuess: function () {
+        receiveResult: function (position, guessPosition, result, allResults) {
+            Game.scoreSum += result.score;
+            document.getElementById('currentScoreSum').innerHTML = String(Game.scoreSum) + '/' + String(Game.rounds.length * Game.MAX_SCORE);
+
+            var resultBounds = new google.maps.LatLngBounds();
+
+            Game.rounds[Game.rounds.length - 1].position = position;
+            Game.addPositionToResultMap();
+            resultBounds.extend(position);
+
+            if (guessPosition) {
+                Game.addGuessPositionToResultMap(guessPosition);
+                resultBounds.extend(guessPosition);
+            }
+
+            if (allResults) {
+                for (var i = 0; i < allResults.length; ++i) {
+                    var currentResult = allResults[i];
+                    if (currentResult.guessPosition) {
+                        Game.addGuessPositionToResultMap(currentResult.guessPosition, currentResult);
+                        resultBounds.extend(currentResult.guessPosition);
+                    }
+                }
+            }
+
+            Game.showResultMap(result, resultBounds);
+        },
+
+        showResultFromHistory: function (result) {
+            var round = Game.rounds[Game.rounds.length - 1];
+            var resultBounds = new google.maps.LatLngBounds();
+
+            round.realMarker.setVisible(true);
+            resultBounds.extend(round.position);
+
+            for (var j = 0; j < round.guessMarkers.length; ++j) {
+                var guessMarker = round.guessMarkers[j];
+                guessMarker.marker.setVisible(true);
+                guessMarker.line.setVisible(true);
+
+                resultBounds.extend(guessMarker.marker.getPosition());
+            }
+
+            Game.showResultMap(result, resultBounds);
+        },
+
+        showResultMap: function (result, resultBounds) {
+            // TODO: refactor - it is necessary for mobile
+            if (window.getComputedStyle(document.getElementById('guess')).visibility === 'hidden') {
+                document.getElementById('showGuessButton').click();
+            }
+
+            if (Game.adaptGuess) {
+                document.getElementById('guess').classList.remove('adapt');
+            }
+
+            if (Game.guessMarker) {
+                Game.guessMarker.setMap(null);
+                Game.guessMarker = null;
+            }
+
+            document.getElementById('guess').classList.add('result');
+
+            Game.map.setOptions({
+                draggableCursor: 'grab'
+            });
+            Game.map.fitBounds(resultBounds);
+
+            var distanceInfo = document.getElementById('distanceInfo');
+            if (result.distance === null) {
+                distanceInfo.children[0].style.display = 'none';
+                distanceInfo.children[1].style.display = 'block';
+            } else {
+                distanceInfo.children[0].style.display = 'block';
+                distanceInfo.children[1].style.display = 'none';
+                document.getElementById('distance').innerHTML = Util.printDistanceForHuman(result.distance);
+            }
+
+            document.getElementById('score').innerHTML = result.score;
+
+            var scoreBarProperties = Game.calculateScoreBarProperties(result.score, Game.MAX_SCORE);
+            var scoreBar = document.getElementById('scoreBar');
+            scoreBar.style.backgroundColor = scoreBarProperties.backgroundColor;
+            scoreBar.style.width = scoreBarProperties.width;
+
+            if (Game.rounds.length === Game.NUMBER_OF_ROUNDS) {
+                document.getElementById('continueButton').style.display = 'none';
+                document.getElementById('showSummaryButton').style.display = 'block';
+            } else if (roomId) {
+                if (Game.multi.owner) {
+                    if (!Game.readyToContinue) {
+                        document.getElementById('continueButton').disabled = true;
+                    }
+                } else {
+                    document.getElementById('continueButton').style.display = 'none';
+                }
+            }
+        },
+
+        guess: function () {
             if (!Game.guessMarker) {
                 return;
             }
@@ -150,63 +522,34 @@
             Game.rounds[Game.rounds.length - 1].guessPosition = guessPosition;
 
             document.getElementById('guessButton').disabled = true;
-            if (Game.adaptGuess) {
-                document.getElementById('guess').classList.remove('adapt');
-            }
-            document.getElementById('loading').style.visibility = 'visible';
             document.getElementById('panoCover').style.visibility = 'visible';
 
             var data = new FormData();
             data.append('lat', String(guessPosition.lat));
             data.append('lng', String(guessPosition.lng));
 
-            MapGuesser.httpRequest('POST', '/game/' + mapId + '/guess.json', function () {
+            document.getElementById('loading').style.visibility = 'visible';
+            var url = roomId ? '/multiGame/' + roomId + '/guess.json' : '/game/' + mapId + '/guess.json';
+            MapGuesser.httpRequest('POST', url, function () {
+                document.getElementById('loading').style.visibility = 'hidden';
+
                 if (this.response.error) {
                     Game.handleErrorResponse(this.response.error);
                     return;
                 }
 
-                Game.guessMarker.setMap(null);
-                Game.guessMarker = null;
+                Game.receiveResult(this.response.position, guessPosition, this.response.result, this.response.allResults);
 
-                document.getElementById('loading').style.visibility = 'hidden';
-                document.getElementById('guess').classList.add('result');
-
-                Game.scoreSum += this.response.result.score;
-                document.getElementById('currentScoreSum').innerHTML = String(Game.scoreSum) + '/' + String(Game.rounds.length * Game.MAX_SCORE);
-
-                Game.rounds[Game.rounds.length - 1].position = this.response.result.position;
-                Game.addRealGuessPair(this.response.result.position, guessPosition);
-
-                var resultBounds = new google.maps.LatLngBounds();
-                resultBounds.extend(this.response.result.position);
-                resultBounds.extend(guessPosition);
-
-                Game.map.setOptions({
-                    draggableCursor: 'grab'
-                });
-                Game.map.fitBounds(resultBounds);
-
-                document.getElementById('distance').innerHTML = Util.printDistanceForHuman(this.response.result.distance);
-                document.getElementById('score').innerHTML = this.response.result.score;
-
-                var scoreBarProperties = Game.calculateScoreBarProperties(this.response.result.score, Game.MAX_SCORE);
-                var scoreBar = document.getElementById('scoreBar');
-                scoreBar.style.backgroundColor = scoreBarProperties.backgroundColor;
-                scoreBar.style.width = scoreBarProperties.width;
-
-                if (Game.rounds.length === Game.NUMBER_OF_ROUNDS) {
-                    document.getElementById('continueButton').style.display = 'none';
-                    document.getElementById('showSummaryButton').style.display = 'block';
+                if (this.response.place) {
+                    Game.panoId = this.response.place.panoId;
+                    Game.pov = this.response.place.pov;
                 }
-
-                Game.panoId = this.response.panoId;
-                Game.pov = this.response.pov;
             }, data);
         },
 
-        addRealGuessPair: function (position, guessPosition, hidden) {
+        addPositionToResultMap: function (hidden) {
             var round = Game.rounds[Game.rounds.length - 1];
+            var position = round.position;
 
             round.realMarker = new google.maps.Marker({
                 map: Game.map,
@@ -227,16 +570,25 @@
             round.realMarker.addListener('click', function () {
                 window.open('https://www.google.com/maps/search/?api=1&query=' + this.getPosition().toUrlValue(), '_blank');
             });
+        },
 
-            round.guessMarker = new google.maps.Marker({
+        addGuessPositionToResultMap: function (guessPosition, result, hidden) {
+            var round = Game.rounds[Game.rounds.length - 1];
+            var position = round.position;
+
+            var guessMarker = { marker: null, line: null, info: null };
+            var markerSvg = result ? 'marker-gray-empty.svg' : 'marker-blue-empty.svg';
+            var markerLabel = result ? result.userName.charAt(0).toUpperCase() : '?';
+
+            guessMarker.marker = new google.maps.Marker({
                 map: Game.map,
                 visible: !hidden,
                 position: guessPosition,
                 zIndex: Game.rounds.length,
-                clickable: false,
+                clickable: !!result,
                 draggable: false,
                 icon: {
-                    url: STATIC_ROOT + '/img/markers/marker-gray-empty.svg?rev=' + REVISION,
+                    url: STATIC_ROOT + '/img/markers/' + markerSvg + '?rev=' + REVISION,
                     size: new google.maps.Size(24, 32),
                     scaledSize: new google.maps.Size(24, 32),
                     anchor: new google.maps.Point(12, 32),
@@ -247,11 +599,11 @@
                     fontFamily: 'Roboto',
                     fontSize: '16px',
                     fontWeight: '500',
-                    text: '?'
+                    text: markerLabel
                 }
             });
 
-            round.line = new google.maps.Polyline({
+            guessMarker.line = new google.maps.Polyline({
                 map: Game.map,
                 visible: !hidden,
                 path: [
@@ -274,6 +626,19 @@
                 draggable: false,
                 editable: false
             });
+
+            if (result) {
+                guessMarker.info = new google.maps.InfoWindow({
+                    content: '<p class="small bold">' + result.userName + '</p>' +
+                        '<p class="small">' + Util.printDistanceForHuman(result.distance) + ' | ' + result.score + ' points</p>',
+                });
+
+                guessMarker.marker.addListener('click', function () {
+                    guessMarker.info.open(Game.map, this);
+                });
+            }
+
+            round.guessMarkers.push(guessMarker);
         },
 
         calculateScoreBarProperties: function (score, maxScore) {
@@ -294,12 +659,19 @@
         showSummary: function () {
             var distanceInfo = document.getElementById('distanceInfo');
             distanceInfo.children[0].style.display = 'none';
-            distanceInfo.children[1].style.display = 'block';
+            distanceInfo.children[1].style.display = 'none';
+            distanceInfo.children[2].style.display = 'block';
             var scoreInfo = document.getElementById('scoreInfo');
             scoreInfo.children[0].style.display = 'none';
             scoreInfo.children[1].style.display = 'block';
             document.getElementById('showSummaryButton').style.display = null;
-            document.getElementById('startNewGameButton').style.display = 'block';
+
+            if (!roomId || Game.multi.owner) {
+                document.getElementById('startNewGameButton').style.display = 'block';
+                if (!Game.readyToContinue) {
+                    document.getElementById('startNewGameButton').disabled = true;
+                }
+            }
 
             var resultBounds = new google.maps.LatLngBounds();
 
@@ -320,12 +692,17 @@
                     fontWeight: '500',
                     text: String(i + 1)
                 });
-                round.realMarker.setVisible(true);
-                round.guessMarker.setVisible(true);
-                round.line.setVisible(true);
 
+                round.realMarker.setVisible(true);
                 resultBounds.extend(round.position);
-                resultBounds.extend(round.guessPosition);
+
+                for (var j = 0; j < round.guessMarkers.length; ++j) {
+                    var guessMarker = round.guessMarkers[j];
+                    guessMarker.marker.setVisible(true);
+                    guessMarker.line.setVisible(true);
+
+                    resultBounds.extend(guessMarker.marker.getPosition());
+                }
             }
 
             Game.map.fitBounds(resultBounds);
@@ -356,6 +733,52 @@
                     Game.googleLink.href = 'https://maps.google.com/maps';
                 }
             }, 1);
+        },
+
+        startCountdown: function (timeout) {
+            if (Game.countdownHandler) {
+                clearInterval(Game.countdownHandler);
+            }
+
+            Game.countdownElement = document.getElementById('countdown');
+            Game.countdownTimeElement = document.getElementById('countdownTime');
+
+            Game.setCountdownTime(Math.round(timeout / 1000));
+
+            if (timeout <= 0) {
+                return;
+            }
+
+            Game.timeoutEnd = new Date(new Date().getTime() + timeout);
+
+            Game.countdownHandler = setInterval(function () {
+                var timeLeft = Math.round((Game.timeoutEnd - new Date()) / 1000);
+
+                Game.setCountdownTime(timeLeft);
+
+                if (timeLeft <= 0) {
+                    document.getElementById('panoCover').style.visibility = 'visible';
+                    clearInterval(Game.countdownHandler);
+                }
+            }, 1000);
+        },
+
+        setCountdownTime: function (time) {
+            if (time <= 0) {
+                Game.countdownElement.style.visibility = 'hidden';
+                return;
+            }
+
+            if (time <= 15) {
+                Game.countdownElement.className = 'red';
+            } else if (time <= 30) {
+                Game.countdownElement.className = 'yellow';
+            } else {
+                Game.countdownElement.className = '';
+            }
+
+            Game.countdownElement.style.visibility = 'visible';
+            Game.countdownTimeElement.innerHTML = time;
         }
     };
 
@@ -373,13 +796,7 @@
         }
     };
 
-    MapGuesser.sessionAvailableHooks.reinitializeGame = function () {
-        MapGuesser.httpRequest('GET', '/game/' + mapId + '/json', function () {
-            mapBounds = this.response.bounds;
-
-            Game.initialize();
-        });
-    };
+    MapGuesser.sessionAvailableHooks.reinitializeGame = Game.prepare;
 
     if (!('ontouchstart' in document.documentElement)) {
         Game.adaptGuess = true;
@@ -392,7 +809,7 @@
     });
 
     Game.map.addListener('click', function (e) {
-        if (Game.rounds[Game.rounds.length - 1].guessPosition) {
+        if (Game.rounds[Game.rounds.length - 1].guessPosition || Game.rounds[Game.rounds.length - 1].position) {
             return;
         }
 
@@ -407,7 +824,7 @@
             clickable: false,
             draggable: true,
             icon: {
-                url: STATIC_ROOT + '/img/markers/marker-gray-empty.svg?rev=' + REVISION,
+                url: STATIC_ROOT + '/img/markers/marker-blue-empty.svg?rev=' + REVISION,
                 size: new google.maps.Size(24, 32),
                 scaledSize: new google.maps.Size(24, 32),
                 anchor: new google.maps.Point(12, 32),
@@ -440,7 +857,9 @@
         Game.rewriteGoogleLink();
     });
 
-    Game.initialize();
+    if (COOKIES_CONSENT) {
+        Game.prepare();
+    }
 
     document.getElementById('showGuessButton').onclick = function () {
         this.style.visibility = 'hidden';
@@ -453,11 +872,27 @@
     }
 
     document.getElementById('guessButton').onclick = function () {
-        Game.evaluateGuess();
+        Game.guess();
     }
 
     document.getElementById('continueButton').onclick = function () {
-        Game.resetRound();
+        if (roomId) {
+            if (!Game.multi.owner || !Game.readyToContinue) {
+                return;
+            }
+
+            document.getElementById('loading').style.visibility = 'visible';
+            MapGuesser.httpRequest('POST', '/multiGame/' + roomId + '/nextRound.json', function () {
+                document.getElementById('loading').style.visibility = 'hidden';
+
+                if (this.response.error) {
+                    Game.handleErrorResponse(this.response.error);
+                    return;
+                }
+            });
+        } else {
+            Game.resetRound();
+        }
     }
 
     document.getElementById('showSummaryButton').onclick = function () {
@@ -465,6 +900,40 @@
     }
 
     document.getElementById('startNewGameButton').onclick = function () {
-        Game.reset();
+        if (roomId) {
+            if (!Game.multi.owner) {
+                return;
+            }
+
+            document.getElementById('loading').style.visibility = 'visible';
+            MapGuesser.httpRequest('POST', '/multiGame/' + roomId + '/initialData.json', function () {
+                document.getElementById('loading').style.visibility = 'hidden';
+
+                if (this.response.error) {
+                    Game.handleErrorResponse(this.response.error);
+                    return;
+                }
+            });
+        } else {
+            Game.reset();
+        }
+    }
+
+    document.getElementById('startMultiGameButton').onclick = function () {
+        if (!roomId || !Game.multi.owner) {
+            return;
+        }
+
+        document.getElementById('multi').style.visibility = 'hidden';
+
+        document.getElementById('loading').style.visibility = 'visible';
+        MapGuesser.httpRequest('POST', '/multiGame/' + roomId + '/initialData.json', function () {
+            document.getElementById('loading').style.visibility = 'hidden';
+
+            if (this.response.error) {
+                Game.handleErrorResponse(this.response.error);
+                return;
+            }
+        });
     }
 })();

public/static/js/mapguesser.js

@@ -1,4 +1,5 @@
 var MapGuesser = {
+    isSecure: window.location.protocol === 'https:',
     cookiesAgreed: false,
     sessionAvailableHooks: {},
 

public/static/js/maps.js

@@ -73,4 +73,40 @@
     window.onresize = function () {
         Maps.calculateDescriptionDivHeights();
     };
+
+    document.getElementById('multiForm').onsubmit = function (e) {
+        e.preventDefault();
+
+        var roomId = this.elements.roomId.value;
+        if (roomId.length !== 6) {
+            return;
+        }
+
+        window.location.href = '/multiGame/' + this.elements.roomId.value;
+    };
+
+    document.getElementById('multiButton').onclick = function () {
+        MapGuesser.showModal('multi');
+        document.getElementById('createNewRoomButton').href = '/multiGame/new/' + this.dataset.mapId;
+        document.getElementById('multiForm').elements.roomId.select();
+    }
+
+    document.getElementById('closePlayModeButton').onclick = function () {
+        MapGuesser.hideModal();
+    };
+
+    document.getElementById('closeMultiButton').onclick = function () {
+        MapGuesser.hideModal();
+    };
+
+    var buttons = document.getElementById('mapContainer').getElementsByClassName('playButton');
+    for (var i = 0; i < buttons.length; i++) {
+        var button = buttons[i];
+
+        button.onclick = function () {
+            MapGuesser.showModal('playMode');
+            document.getElementById('singleButton').href = '/game/' + this.dataset.mapId;
+            document.getElementById('multiButton').dataset.mapId = this.dataset.mapId;
+        };
+    }
 })();

scripts/install.sh

@@ -9,6 +9,9 @@ if [ -f ${ROOT_DIR}/installed ]; then
     exit 1
 fi
 
+echo "Installing NPM packages..."
+(cd ${ROOT_DIR}/multi && npm install)
+
 echo "Installing Yarn packages..."
 (cd ${ROOT_DIR}/public/static && yarn install)
 

scripts/update.sh

@@ -11,6 +11,9 @@ else
     (cd ${ROOT_DIR} && composer install --dev)
 fi
 
+echo "Installing NPM packages..."
+(cd ${ROOT_DIR}/multi && npm install)
+
 echo "Installing Yarn packages..."
 (cd ${ROOT_DIR}/public/static && yarn install)
 

src/Cli/MaintainDatabaseCommand.php

@@ -5,6 +5,7 @@ use MapGuesser\Database\Query\Modify;
 use MapGuesser\Database\Query\Select;
 use MapGuesser\Interfaces\Database\IResultSet;
 use MapGuesser\PersistentData\PersistentDataManager;
+use MapGuesser\Repository\MultiRoomRepository;
 use MapGuesser\Repository\UserConfirmationRepository;
 use MapGuesser\Repository\UserPasswordResetterRepository;
 use MapGuesser\Repository\UserRepository;
@@ -22,6 +23,8 @@ class MaintainDatabaseCommand extends Command
 
     private UserPasswordResetterRepository $userPasswordResetterRepository;
 
+    private MultiRoomRepository $multiRoomRepository;
+
     public function __construct()
     {
         parent::__construct();
@@ -30,6 +33,7 @@ class MaintainDatabaseCommand extends Command
         $this->userRepository = new UserRepository();
         $this->userConfirmationRepository = new UserConfirmationRepository();
         $this->userPasswordResetterRepository = new UserPasswordResetterRepository();
+        $this->multiRoomRepository = new MultiRoomRepository();
     }
 
     public function configure(): void
@@ -43,6 +47,7 @@ class MaintainDatabaseCommand extends Command
         try {
             $this->deleteInactiveExpiredUsers();
             $this->deleteExpiredPasswordResetters();
+            $this->deleteExpiredRooms();
             $this->deleteExpiredSessions();
         } catch (\Exception $e) {
             $output->writeln('<error>Maintenance failed!</error>');
@@ -89,6 +94,13 @@ class MaintainDatabaseCommand extends Command
         }
     }
 
+    private function deleteExpiredRooms(): void
+    {
+        foreach ($this->multiRoomRepository->getAllExpired() as $multiRoom) {
+            $this->pdm->deleteFromDb($multiRoom);
+        }
+    }
+
     private function deleteExpiredSessions(): void
     {
         //TODO: model may be used for sessions too

src/Controller/GameController.php

@@ -1,20 +1,37 @@
 <?php namespace MapGuesser\Controller;
 
+use DateTime;
+use Faker\Factory;
 use MapGuesser\Interfaces\Request\IRequest;
 use MapGuesser\Response\HtmlContent;
 use MapGuesser\Response\JsonContent;
 use MapGuesser\Interfaces\Response\IContent;
+use MapGuesser\Interfaces\Response\IRedirect;
+use MapGuesser\Multi\MultiConnector;
+use MapGuesser\PersistentData\Model\MultiRoom;
+use MapGuesser\PersistentData\PersistentDataManager;
 use MapGuesser\Repository\MapRepository;
+use MapGuesser\Repository\MultiRoomRepository;
+use MapGuesser\Response\Redirect;
 
 class GameController
 {
     private IRequest $request;
 
+    private PersistentDataManager $pdm;
+
+    private MultiConnector $multiConnector;
+
+    private MultiRoomRepository $multiRoomRepository;
+
     private MapRepository $mapRepository;
 
     public function __construct(IRequest $request)
     {
         $this->request = $request;
+        $this->pdm = new PersistentDataManager();
+        $this->multiConnector = new MultiConnector();
+        $this->multiRoomRepository = new MultiRoomRepository();
         $this->mapRepository = new MapRepository();
     }
 
@@ -22,30 +39,128 @@ class GameController
     {
         $mapId = (int) $this->request->query('mapId');
 
-        return new HtmlContent('game', $this->prepareGame($mapId));
+        return new HtmlContent('game', ['mapId' => $mapId]);
     }
 
-    public function getGameJson(): IContent
+    public function getNewMultiGame(): IRedirect
     {
         $mapId = (int) $this->request->query('mapId');
+        $map = $this->mapRepository->getById($mapId);
+        $roomId = bin2hex(random_bytes(3));
+        $token = $this->getMultiToken($roomId);
 
-        return new JsonContent($this->prepareGame($mapId));
+        $room = new MultiRoom();
+        $room->setRoomId($roomId);
+        $room->setStateArray([
+            'mapId' => $mapId,
+            'area' => $map->getArea(),
+            'rounds' => [],
+            'currentRound' => -1
+        ]);
+        $room->setMembersArray(['owner' => $token, 'all' => []]);
+        $room->setUpdatedDate(new DateTime());
+
+        $this->pdm->saveToDb($room);
+
+        $this->multiConnector->sendMessage('create_room', ['roomId' => $roomId]);
+
+        return new Redirect(
+            \Container::$routeCollection
+                ->getRoute('multiGame')
+                ->generateLink(['roomId' => $roomId]),
+            IRedirect::TEMPORARY
+        );
     }
 
-    private function prepareGame(int $mapId): array
+    public function getMultiGame(): IContent
     {
-        $map = $this->mapRepository->getById($mapId);
+        $roomId = $this->request->query('roomId');
 
+        return new HtmlContent('game', ['roomId' => $roomId]);
+    }
+
+    public function prepareGame(): IContent
+    {
+        $mapId = (int) $this->request->query('mapId');
+        $map = $this->mapRepository->getById($mapId);
         $session = $this->request->session();
 
         if (!($state = $session->get('state')) || $state['mapId'] !== $mapId) {
             $session->set('state', [
                 'mapId' => $mapId,
                 'area' => $map->getArea(),
-                'rounds' => []
+                'rounds' => [],
+                'currentRound' => -1
             ]);
         }
 
-        return ['mapId' => $mapId, 'mapName' => $map->getName(), 'bounds' => $map->getBounds()->toArray()];
+        return new JsonContent([
+            'mapId' => $mapId,
+            'mapName' => $map->getName(),
+            'bounds' => $map->getBounds()->toArray()
+        ]);
+    }
+
+    public function prepareMultiGame(): IContent
+    {
+        $roomId = $this->request->query('roomId');
+        $userName = $this->request->post('userName');
+        if (empty($userName)) {
+            $faker = Factory::create();
+            $userName = $faker->userName;
+        }
+
+        $room = $this->multiRoomRepository->getByRoomId($roomId);
+        $state = $room->getStateArray();
+        $map = $this->mapRepository->getById($state['mapId']);
+        $token = $this->getMultiToken($roomId);
+
+        $members = $room->getMembersArray();
+
+        if (!in_array($token, $members['all'])) {
+            if ($state['currentRound'] >= 0) {
+                return new JsonContent(['error' => 'game_already_started']);
+            }
+
+            $members['all'][] = $token;
+        }
+
+        $room->setMembersArray($members);
+        $room->setUpdatedDate(new DateTime());
+
+        $this->pdm->saveToDb($room);
+
+        $this->multiConnector->sendMessage('join_room', [
+            'roomId' => $roomId,
+            'token' => $token,
+            'userName' => $userName
+        ]);
+
+        return new JsonContent([
+            'roomId' => $roomId,
+            'token' => $token,
+            'owner' => $members['owner'] == $token,
+            'mapId' => $state['mapId'],
+            'mapName' => $map->getName(),
+            'bounds' => $map->getBounds()->toArray()
+        ]);
+    }
+
+    private function getMultiToken(string $roomId): string
+    {
+        $session = $this->request->session();
+
+        if (!($multiState = $session->get('multiState')) || $multiState['roomId'] !== $roomId) {
+            $token = bin2hex(random_bytes(16));
+
+            $session->set('multiState', [
+                'roomId' => $roomId,
+                'token' => $token
+            ]);
+        } else {
+            $token = $multiState['token'];
+        }
+
+        return $token;
     }
 }

src/Controller/GameFlowController.php

@@ -1,10 +1,13 @@
 <?php namespace MapGuesser\Controller;
 
+use DateTime;
 use MapGuesser\Interfaces\Request\IRequest;
 use MapGuesser\Util\Geo\Position;
 use MapGuesser\Response\JsonContent;
 use MapGuesser\Interfaces\Response\IContent;
-use MapGuesser\PersistentData\Model\Place;
+use MapGuesser\Multi\MultiConnector;
+use MapGuesser\PersistentData\PersistentDataManager;
+use MapGuesser\Repository\MultiRoomRepository;
 use MapGuesser\Repository\PlaceRepository;
 
 class GameFlowController
@@ -14,129 +17,226 @@ class GameFlowController
 
     private IRequest $request;
 
+    private PersistentDataManager $pdm;
+
+    private MultiConnector $multiConnector;
+
+    private MultiRoomRepository $multiRoomRepository;
+
     private PlaceRepository $placeRepository;
 
     public function __construct(IRequest $request)
     {
         $this->request = $request;
+        $this->pdm = new PersistentDataManager();
+        $this->multiConnector = new MultiConnector();
+        $this->multiRoomRepository = new MultiRoomRepository();
         $this->placeRepository = new PlaceRepository();
     }
 
-    public function getNewPlace(): IContent
+    public function initialData(): IContent
     {
         $mapId = (int) $this->request->query('mapId');
-
         $session = $this->request->session();
 
         if (!($state = $session->get('state')) || $state['mapId'] !== $mapId) {
             return new JsonContent(['error' => 'no_session_found']);
         }
 
-        if (count($state['rounds']) === 0) {
-            $placesWithoutPano = [];
-            $place = $this->placeRepository->getRandomForMapWithValidPano($mapId, [], $placesWithoutPano);
-
-            $this->addNewRoundToState($state, $place, $placesWithoutPano);
-
+        if (!isset($state['currentRound']) || $state['currentRound'] == -1 || $state['currentRound'] >= static::NUMBER_OF_ROUNDS) {
+            $this->startNewGame($state, $mapId);
             $session->set('state', $state);
+        }
 
-            $data = [
-                'panoId' => $place->getPanoIdCached(),
-                'pov' => $place->getPov()->toArray()
-            ];
-        } else {
-            $rounds = count($state['rounds']);
-            $last = $state['rounds'][$rounds - 1];
+        $response = [];
 
-            $history = [];
-            for ($i = 0; $i < $rounds - 1; ++$i) {
-                $round = $state['rounds'][$i];
-                $history[] = [
-                    'position' => $round['position']->toArray(),
+        $last = $state['rounds'][$state['currentRound']];
+        $response['place'] = [
+            'panoId' => $last['panoId'],
+            'pov' => $last['pov']->toArray()
+        ];
+
+        $response['history'] = [];
+        for ($i = 0; $i < $state['currentRound']; ++$i) {
+            $round = $state['rounds'][$i];
+            $response['history'][] = [
+                'position' => $round['position']->toArray(),
+                'result' => [
                     'guessPosition' => $round['guessPosition']->toArray(),
                     'distance' => $round['distance'],
                     'score' => $round['score']
-                ];
-            }
-
-            $data = [
-                'history' => $history,
-                'panoId' => $last['panoId'],
-                'pov' => isset($last['pov']) ? // should be checked not to break with old sessions
-                    $last['pov']->toArray() :
-                    ['heading' => 0.0, 'pitch' => 0.0, 'zoom' => 0.0],
+                ]
             ];
         }
 
-        return new JsonContent($data);
+        return new JsonContent($response);
     }
 
-    public function evaluateGuess(): IContent
+    public function multiInitialData(): IContent
+    {
+        $roomId = $this->request->query('roomId');
+        $session = $this->request->session();
+
+        if (!($multiState = $session->get('multiState')) || $multiState['roomId'] !== $roomId) {
+            return new JsonContent(['error' => 'no_session_found']);
+        }
+
+        $room = $this->multiRoomRepository->getByRoomId($roomId);
+        $state = $room->getStateArray();
+        $members = $room->getMembersArray();
+
+        if ($members['owner'] !== $multiState['token']) {
+            return new JsonContent(['error' => 'not_owner_of_room']);
+        }
+
+        if ($state['currentRound'] == -1 || $state['currentRound'] >= static::NUMBER_OF_ROUNDS - 1) {
+            $this->startNewGame($state, $state['mapId']);
+            $room->setStateArray($state);
+            $room->setUpdatedDate(new DateTime());
+            $this->pdm->saveToDb($room);
+        }
+
+        $places = [];
+        foreach ($state['rounds'] as $round) {
+            $places[] = [
+                'position' => $round['position']->toArray(),
+                'panoId' => $round['panoId'],
+                'pov' => $round['pov']->toArray()
+            ];
+        }
+
+        $this->multiConnector->sendMessage('start_game', ['roomId' => $roomId, 'places' => $places]);
+
+        return new JsonContent(['ok' => true]);
+    }
+
+    public function guess(): IContent
     {
         $mapId = (int) $this->request->query('mapId');
-
         $session = $this->request->session();
 
         if (!($state = $session->get('state')) || $state['mapId'] !== $mapId) {
             return new JsonContent(['error' => 'no_session_found']);
         }
 
-        $last = $state['rounds'][count($state['rounds']) - 1];
-
-        $position = $last['position'];
+        $last = $state['rounds'][$state['currentRound']];
         $guessPosition = new Position((float) $this->request->post('lat'), (float) $this->request->post('lng'));
-
-        $distance = $this->calculateDistance($position, $guessPosition);
-        $score = $this->calculateScore($distance, $state['area']);
+        $result = $this->evalueteGuess($last['position'], $guessPosition, $state['area']);
 
         $last['guessPosition'] = $guessPosition;
-        $last['distance'] = $distance;
-        $last['score'] = $score;
-        $state['rounds'][count($state['rounds']) - 1] = $last;
+        $last['distance'] = $result['distance'];
+        $last['score'] = $result['score'];
 
-        if (count($state['rounds']) < static::NUMBER_OF_ROUNDS) {
-            $exclude = [];
+        $response = [
+            'position' => $last['position']->toArray(),
+            'result' => $result
+        ];
 
-            foreach ($state['rounds'] as $round) {
-                $exclude = array_merge($exclude, $round['placesWithoutPano'], [$round['placeId']]);
-            }
+        $state['rounds'][$state['currentRound']] = $last;
+        $state['currentRound'] += 1;
+        if ($state['currentRound'] < static::NUMBER_OF_ROUNDS) {
+            $next = $state['rounds'][$state['currentRound']];
 
-            $placesWithoutPano = [];
-            $place = $this->placeRepository->getRandomForMapWithValidPano($mapId, $exclude, $placesWithoutPano);
-
-            $this->addNewRoundToState($state, $place, $placesWithoutPano);
-
-            $panoId = $place->getPanoIdCached();
-            $pov = $place->getPov()->toArray();
-        } else {
-            $state['rounds'] = [];
-
-            $panoId = null;
-            $pov = null;
+            $response['place'] = [
+                'panoId' => $next['panoId'],
+                'pov' => $next['pov']->toArray()
+            ];
         }
 
         $session->set('state', $state);
 
-        return new JsonContent([
-            'result' => [
-                'position' => $position->toArray(),
-                'distance' => $distance,
-                'score' => $score
-            ],
-            'panoId' => $panoId,
-            'pov' => $pov
-        ]);
+        return new JsonContent($response);
     }
 
-    private function addNewRoundToState(array &$state, Place $place, array $placesWithoutPano): void
+    public function multiGuess(): IContent
     {
-        $state['rounds'][] = [
-            'placesWithoutPano' => $placesWithoutPano,
-            'placeId' => $place->getId(),
-            'position' => $place->getPosition(),
-            'panoId' => $place->getPanoIdCached(),
-            'pov' => $place->getPov()
+        $roomId = $this->request->query('roomId');
+        $session = $this->request->session();
+
+        if (!($multiState = $session->get('multiState')) || $multiState['roomId'] !== $roomId) {
+            return new JsonContent(['error' => 'no_session_found']);
+        }
+
+        $room = $this->multiRoomRepository->getByRoomId($roomId);
+        $state = $room->getStateArray();
+
+        $last = $state['rounds'][$state['currentRound']];
+        $guessPosition = new Position((float) $this->request->post('lat'), (float) $this->request->post('lng'));
+        $result = $this->evalueteGuess($last['position'], $guessPosition, $state['area']);
+
+        $responseFromMulti = $this->multiConnector->sendMessage('guess', [
+            'roomId' => $roomId,
+            'token' => $multiState['token'],
+            'guessPosition' => $guessPosition->toArray(),
+            'distance' => $result['distance'],
+            'score' => $result['score']
+        ]);
+
+        if (isset($responseFromMulti['error'])) {
+            return new JsonContent(['error' => $responseFromMulti['error']]);
+        }
+
+        $response = [
+            'position' => $last['position']->toArray(),
+            'result' => $result,
+            'allResults' => $responseFromMulti['allResults']
         ];
+
+        return new JsonContent($response);
+    }
+
+    public function multiNextRound(): IContent
+    {
+        $roomId = $this->request->query('roomId');
+        $session = $this->request->session();
+
+        if (!($multiState = $session->get('multiState')) || $multiState['roomId'] !== $roomId) {
+            return new JsonContent(['error' => 'no_session_found']);
+        }
+
+        $room = $this->multiRoomRepository->getByRoomId($roomId);
+        $state = $room->getStateArray();
+        $members = $room->getMembersArray();
+
+        if ($members['owner'] !== $multiState['token']) {
+            return new JsonContent(['error' => 'not_owner_of_room']);
+        }
+
+        $state['currentRound'] += 1;
+        if ($state['currentRound'] < static::NUMBER_OF_ROUNDS) {
+            $this->multiConnector->sendMessage('next_round', ['roomId' => $roomId, 'currentRound' => $state['currentRound']]);
+        }
+
+        $room->setStateArray($state);
+        $room->setUpdatedDate(new DateTime());
+        $this->pdm->saveToDb($room);
+
+        return new JsonContent(['ok' => true]);
+    }
+
+    private function evalueteGuess(Position $realPosition, Position $guessPosition, float $area)
+    {
+        $distance = $this->calculateDistance($realPosition, $guessPosition);
+        $score = $this->calculateScore($distance, $area);
+
+        return ['distance' => $distance, 'score' => $score];
+    }
+
+    private function startNewGame(array &$state, int $mapId): void
+    {
+        $places = $this->placeRepository->getRandomNForMapWithValidPano($mapId, static::NUMBER_OF_ROUNDS);
+
+        $state['rounds'] = [];
+        $state['currentRound'] = 0;
+
+        foreach ($places as $place) {
+            $state['rounds'][] = [
+                'placeId' => $place->getId(),
+                'position' => $place->getPosition(),
+                'panoId' => $place->getPanoIdCached(),
+                'pov' => $place->getPov()
+            ];
+        }
     }
 
     private function calculateDistance(Position $realPosition, Position $guessPosition): float

src/Multi/MultiConnector.php

@@ -0,0 +1,22 @@
+<?php namespace MapGuesser\Multi;
+
+class MultiConnector
+{
+    public function sendMessage(string $func, array $args = [])
+    {
+        $message = json_encode([
+            'func' => $func,
+            'args' => $args
+        ]);
+
+        $connection = fsockopen($_ENV['MULTI_INTERNAL_HOST'], $_ENV['MULTI_INTERNAL_PORT']);
+        fwrite($connection, $message);
+        $response = '';
+        while (!feof($connection)) {
+            $response .= fgets($connection);
+        }
+        fclose($connection);
+
+        return json_decode($response, true);
+    }
+}

src/PersistentData/Model/MultiRoom.php

@@ -0,0 +1,88 @@
+<?php namespace MapGuesser\PersistentData\Model;
+
+use DateTime;
+
+class MultiRoom extends Model
+{
+    protected static string $table = 'multi_rooms';
+
+    protected static array $fields = ['room_id', 'state', 'members', 'updated'];
+
+    private string $roomId = '';
+
+    private array $state = [];
+
+    private array $members = [];
+
+    private DateTime $updated;
+
+    public function setRoomId(string $roomId): void
+    {
+        $this->roomId = $roomId;
+    }
+
+    public function setStateArray(array $state): void
+    {
+        $this->state = $state;
+    }
+
+    public function setMembersArray(array $members): void
+    {
+        $this->members = $members;
+    }
+
+    public function setState(string $state): void
+    {
+        $this->state = unserialize($state);
+    }
+
+    public function setMembers(string $members): void
+    {
+        $this->members = unserialize($members);
+    }
+
+    public function setUpdatedDate(DateTime $updated): void
+    {
+        $this->updated = $updated;
+    }
+
+    public function setUpdated(string $updated): void
+    {
+        $this->updated = new DateTime($updated);
+    }
+
+    public function getRoomId(): string
+    {
+        return $this->roomId;
+    }
+
+    public function getStateArray(): array
+    {
+        return $this->state;
+    }
+
+    public function getState(): string
+    {
+        return serialize($this->state);
+    }
+
+    public function getMembersArray(): array
+    {
+        return $this->members;
+    }
+
+    public function getMembers(): string
+    {
+        return serialize($this->members);
+    }
+
+    public function getUpdatedDate(): DateTime
+    {
+        return $this->updated;
+    }
+
+    public function getUpdated(): string
+    {
+        return $this->updated->format('Y-m-d H:i:s');
+    }
+}

src/Repository/MultiRoomRepository.php

@@ -0,0 +1,38 @@
+<?php namespace MapGuesser\Repository;
+
+use DateTime;
+use Generator;
+use MapGuesser\Database\Query\Select;
+use MapGuesser\PersistentData\Model\MultiRoom;
+use MapGuesser\PersistentData\PersistentDataManager;
+
+class MultiRoomRepository
+{
+    private PersistentDataManager $pdm;
+
+    public function __construct()
+    {
+        $this->pdm = new PersistentDataManager();
+    }
+
+    public function getById(int $id): ?MultiRoom
+    {
+        return $this->pdm->selectFromDbById($id, MultiRoom::class);
+    }
+
+    public function getByRoomId(string $roomId): ?MultiRoom
+    {
+        $select = new Select(\Container::$dbConnection);
+        $select->where('room_id', '=', $roomId);
+
+        return $this->pdm->selectFromDb($select, MultiRoom::class);
+    }
+
+    public function getAllExpired(): Generator
+    {
+        $select = new Select(\Container::$dbConnection);
+        $select->where('updated', '<', (new DateTime('-7 day'))->format('Y-m-d H:i:s'));
+
+        yield from $this->pdm->selectMultipleFromDb($select, MultiRoom::class);
+    }
+}

src/Repository/PlaceRepository.php

@@ -29,17 +29,29 @@ class PlaceRepository
     }
 
     //TODO: use Map instead of id
-    public function getRandomForMapWithValidPano(int $mapId, array $exclude = [], array &$placesWithoutPano): Place
+    public function getRandomNForMapWithValidPano(int $mapId, int $n, array $exclude = []): array
     {
-        $placesWithoutPano = [];
+        $places = [];
 
+        for ($i = 1; $i <= $n; ++$i) {
+            $place = $this->getRandomForMapWithValidPano($mapId, $exclude);
+
+            $places[] = $place;
+            $exclude[] = $place->getId();
+        }
+
+        return $places;
+    }
+
+    //TODO: use Map instead of id
+    public function getRandomForMapWithValidPano(int $mapId, array $exclude = []): Place
+    {
         do {
             $place = $this->selectRandomFromDbForMap($mapId, $exclude);
 
             $panoId = $place->getFreshPanoId();
-
             if ($panoId === null) {
-                $placesWithoutPano[] = $exclude[] = $place->getId();
+                $exclude[] = $place->getId();
             }
         } while ($panoId === null);
 

views/game.php

@@ -5,13 +5,25 @@
 
 @extends(templates/layout_full)
 
+@section(pagemodal)
+<div id="multi" class="modal">
+    <h2>Multiplayer (beta)</h2>
+    <p class="marginTop">Waiting for players...</p>
+    <div id="players" class="marginTop"></div>
+    <button id="startMultiGameButton" class="button fullWidth marginTop green">Start game</button>
+</div>
+@endsection
+
 @section(subheader)
-        <span id="mapName" class="bold"><?= $mapName ?></span><!--
-        --><span>Round <span id="currentRound" class="bold"></span></span><!--
-        --><span>Score <span id="currentScoreSum" class="bold"></span></span>
+    <span id="mapName" class="bold">Loading map...</span><!--
+ --><span>Round <span id="currentRound" class="bold"></span></span><!--
+ --><span>Score <span id="currentScoreSum" class="bold"></span></span>
 @endsection
 
 @section(main)
+    <div id="countdown">
+        <p id="countdownTime" class="mono bold"></p>
+    </div>
     <div id="panoCover"></div>
     <div id="panorama"></div>
     <div id="showGuessButtonContainer">
@@ -28,6 +40,7 @@
         <div id="resultInfo">
             <div id="distanceInfo">
                 <p>You were <span id="distance" class="bold"></span> close.</p>
+                <p>You didn't guess in this round.</p>
                 <p class="bold">Game finished.</p>
             </div>
             <div id="scoreInfo">
@@ -50,7 +63,8 @@
 
 @section(pageScript)
 <script>
-    var mapId = <?= $mapId ?>;
-    var mapBounds = <?= json_encode($bounds) ?>;
+    var multiUrl = '<?= $_ENV['MULTI_WS_URL'] ?>';
+    var roomId = <?= isset($roomId) ? '\'' . $roomId . '\'' : 'null' ?>;
+    var mapId = <?= isset($mapId) ? '\'' . $mapId . '\'' : 'null' ?>;
 </script>
 @endsection

views/maps.php

@@ -5,6 +5,32 @@ TODO: condition!
 
 @extends(templates/layout_normal)
 
+@section(pagemodal)
+<div id="playMode" class="modal">
+    <h2>Play map</h2>
+    <a id="singleButton" class="button fullWidth marginTop" href="" title="Single player">Single player</a>
+    <p class="bold center marginTop marginBottom">OR</p>
+    <button id="multiButton" class="fullWidth green" data-map-id="">Multiplayer (beta)</button>
+    <div class="right">
+        <button id="closePlayModeButton" class="gray marginTop" type="button">Close</button>
+    </div>
+</div>
+<div id="multi" class="modal">
+    <h2>Multiplayer (beta)</h2>
+    <form id="multiForm" class="marginTop" data-no-submit="true">
+        <a id="createNewRoomButton" class="button fullWidth green" href="" title="Create new room">Create new room</a>
+        <p class="bold center marginTop marginBottom">OR</p>
+        <div class="inputWithButton">
+            <input type="text" name="roomId" placeholder="Room to connect" required minlength="6" maxlength="6"><!--
+         --><button id="authenticateWithGoogleButton" type="submit">Connect</button>
+        </div>
+        <div class="right">
+            <button id="closeMultiButton" class="gray marginTop" type="button">Close</button>
+        </div>
+    </form>
+</div>
+@endsection
+
 @section(main)
     <div id="mapContainer">
         <?php foreach ($maps as $map): ?>
@@ -35,15 +61,15 @@ TODO: condition!
                         <p class="small center"><?= $map['description'] ?></p>
                     </div>
                 </div>
-                <?php if ($isAdmin): ?>
-                    <div class="buttonContainer">
-                        <a class="button fullWidth noRightRadius" href="/game/<?= $map['id']; ?>" title="Play map '<?= $map['name'] ?>'">Play this map</a>
+                <div class="buttonContainer">
+                    <?php if ($isAdmin): ?>
+                        <button class="button fullWidth noRightRadius playButton" data-map-id="<?= $map['id'] ?>" data-map-name="<?= htmlspecialchars($map['name']) ?>" title="Play map '<?= $map['name'] ?>'">Play this map</button>
                         <a class="button yellow fullWidth noLeftRadius noRightRadius" href="/admin/mapEditor/<?= $map['id']; ?>" title="Edit map '<?= $map['name'] ?>'">Edit</a>
                         <button class="button red fullWidth noLeftRadius deleteButton" data-map-id="<?= $map['id'] ?>" data-map-name="<?= htmlspecialchars($map['name']) ?>" title="Delete map '<?= $map['name'] ?>'">Delete</button>
-                    </div>
-                <?php else: ?>
-                    <a class="button fullWidth" href="/game/<?= $map['id']; ?>" title="Play map '<?= $map['name'] ?>'">Play this map</a>
-                <?php endif; ?>
+                    <?php else: ?>
+                        <button class="button fullWidth playButton" data-map-id="<?= $map['id'] ?>" data-map-name="<?= htmlspecialchars($map['name']) ?>" title="Play map '<?= $map['name'] ?>'">Play this map</button>
+                    <?php endif; ?>
+                </div>
             </div>
         <?php endforeach; ?>
         <?php if ($isAdmin): ?>

views/templates/layout_full.php

@@ -4,7 +4,7 @@
 <header class="small">
     <h1>
         <a href="/" title="<?= $_ENV['APP_NAME'] ?>">
-            <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>"><!--
+            <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>" alt="<?= $_ENV['APP_NAME'] ?>"><!--
          --><span><?= $_ENV['APP_NAME'] ?></span>
         </a>
     </h1>

views/templates/layout_minimal.php

@@ -3,7 +3,7 @@
 @section(content)
 <header>
     <h1>
-        <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>"><!--
+        <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>" alt="<?= $_ENV['APP_NAME'] ?>"><!--
      --><?= $_ENV['APP_NAME'] ?>
     </h1>
 </header>

views/templates/layout_normal.php

@@ -4,7 +4,7 @@
 <header>
     <h1>
         <a href="/" title="<?= $_ENV['APP_NAME'] ?>">
-            <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>"><!--
+            <img class="inline" width="1em" height="1em" src="<?= $_ENV['STATIC_ROOT'] ?>/img/icon.svg?rev=<?= REVISION ?>" alt="<?= $_ENV['APP_NAME'] ?>"><!--
          --><span><?= $_ENV['APP_NAME'] ?></span>
         </a>
     </h1>

views/templates/mapguesser.php

@@ -1,13 +1,23 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
     <meta charset="utf-8">
+    <meta name="description" content="<?= $_ENV['APP_NAME'] ?> – A game about guessing where you are based on a street view panorama.">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <meta name="theme-color" content="#198231">
     <title><?= $_ENV['APP_NAME'] ?></title>
+    <?php if (preg_match('/^(http(s)?:)?\/\//', $_ENV['STATIC_ROOT']) === 1): ?>
+        <link href="<?= $_ENV['STATIC_ROOT'] ?>" rel="preconnect">
+    <?php endif; ?>
+    <link href="https://fonts.gstatic.com" rel="preconnect">
+    <link href="https://maps.googleapis.com" rel="preconnect">
+    <?php if (!empty($_ENV['GOOGLE_ANALITICS_ID'])): ?>
+        <link href="https://www.googletagmanager.com" rel="preconnect">
+        <link href="https://www.google-analytics.com" rel="preconnect">
+    <?php endif; ?>
+    <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;500&amp;display=swap" rel="stylesheet">
     <link href="<?= $_ENV['STATIC_ROOT'] ?>/css/mapguesser.css?rev=<?= REVISION ?>" rel="stylesheet">
     @yields('externalCss')
-    <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;500&display=swap" rel="stylesheet">
     @yields('inlineCss')
     <link rel="icon" type="image/png" sizes="192x192" href="<?= $_ENV['STATIC_ROOT'] ?>/img/favicon/192x192.png?rev=<?= REVISION ?>">
     <link rel="icon" type="image/png" sizes="96x96" href="<?= $_ENV['STATIC_ROOT'] ?>/img/favicon/96x96.png?rev=<?= REVISION ?>">
@@ -15,16 +25,8 @@
     <link rel="icon" type="image/png" sizes="16x16" href="<?= $_ENV['STATIC_ROOT'] ?>/img/favicon/16x16.png?rev=<?= REVISION ?>">
 </head>
 <body>
-    <?php if (!isset($_COOKIE['COOKIES_CONSENT'])): ?>
-        <div id="cookiesNotice">
-            <p class="small">
-                <?= $_ENV['APP_NAME'] ?> uses cookies to improve user experience. By using the app or clicking 'Agree', you consent to our use of cookies.
-            </p>
-            <button id="agreeCookiesButton" class="small marginTop">Agree</button>
-        </div>
-    <?php endif; ?>
     <div id="loading">
-        <img src="<?= $_ENV['STATIC_ROOT'] ?>/img/loading.svg?rev=<?= REVISION ?>" width="64" height="64">
+        <img src="<?= $_ENV['STATIC_ROOT'] ?>/img/loading.svg?rev=<?= REVISION ?>" width="64" height="64" alt="Loading">
     </div>
     <div id="cover"></div>
     <div id="modal" class="modal">
@@ -34,6 +36,14 @@
     </div>
     @yields('pagemodal')
     @yields('content')
+    <?php if (!isset($_COOKIE['COOKIES_CONSENT'])): ?>
+        <div id="cookiesNotice">
+            <p class="small">
+                <?= $_ENV['APP_NAME'] ?> uses cookies to improve user experience. By using the app or clicking 'Agree', you consent to our use of cookies.
+            </p>
+            <button id="agreeCookiesButton" class="small marginTop">Agree</button>
+        </div>
+    <?php endif; ?>
     <script>
         const STATIC_ROOT = '<?= $_ENV['STATIC_ROOT'] ?>';
         const REVISION = '<?= REVISION ?>';

web.php

@@ -50,9 +50,17 @@ Container::$routeCollection->group('account', function (MapGuesser\Routing\Route
 //Container::$routeCollection->get('maps', 'maps', [MapGuesser\Controller\MapsController::class, 'getMaps']);
 Container::$routeCollection->group('game', function (MapGuesser\Routing\RouteCollection $routeCollection) {
     $routeCollection->get('game', '{mapId}', [MapGuesser\Controller\GameController::class, 'getGame']);
-    $routeCollection->get('game-json', '{mapId}/json', [MapGuesser\Controller\GameController::class, 'getGameJson']);
-    $routeCollection->get('newPlace-json', '{mapId}/newPlace.json', [MapGuesser\Controller\GameFlowController::class, 'getNewPlace']);
-    $routeCollection->post('guess-json', '{mapId}/guess.json', [MapGuesser\Controller\GameFlowController::class, 'evaluateGuess']);
+    $routeCollection->post('game.prepare-json', '{mapId}/prepare.json', [MapGuesser\Controller\GameController::class, 'prepareGame']);
+    $routeCollection->post('game.initialData-json', '{mapId}/initialData.json', [MapGuesser\Controller\GameFlowController::class, 'initialData']);
+    $routeCollection->post('game.guess-json', '{mapId}/guess.json', [MapGuesser\Controller\GameFlowController::class, 'guess']);
+});
+Container::$routeCollection->group('multiGame', function (MapGuesser\Routing\RouteCollection $routeCollection) {
+    $routeCollection->get('multiGame.new', 'new/{mapId}', [MapGuesser\Controller\GameController::class, 'getNewMultiGame']);
+    $routeCollection->get('multiGame', '{roomId}', [MapGuesser\Controller\GameController::class, 'getMultiGame']);
+    $routeCollection->post('multiGame.prepare-json', '{roomId}/prepare.json', [MapGuesser\Controller\GameController::class, 'prepareMultiGame']);
+    $routeCollection->post('multiGame.initialData-json', '{roomId}/initialData.json', [MapGuesser\Controller\GameFlowController::class, 'multiInitialData']);
+    $routeCollection->post('multiGame.nextRound-json', '{roomId}/nextRound.json', [MapGuesser\Controller\GameFlowController::class, 'multiNextRound']);
+    $routeCollection->post('multiGame.guess-json', '{roomId}/guess.json', [MapGuesser\Controller\GameFlowController::class, 'multiGuess']);
 });
 Container::$routeCollection->group('admin', function (MapGuesser\Routing\RouteCollection $routeCollection) {
     $routeCollection->get('admin.mapEditor', 'mapEditor/{mapId?}', [MapGuesser\Controller\MapAdminController::class, 'getMapEditor']);