From 62469ca458adbc816e9537a2261929511af90736 Mon Sep 17 00:00:00 2001
From: Filipe Deschamps <filiped@gmail.com>
Date: Thu, 15 Aug 2019 23:44:05 -0700
Subject: [PATCH] playground: mirror Doom Fire repository structure

---
 .gitignore                                    |    2 +
 README.md                                     |    6 +-
 .../1st-proof-of-concept/100-collect.mp3      |  Bin 0 -> 1749 bytes
 playground/1st-proof-of-concept/collect.mp3   |  Bin 0 -> 1125 bytes
 .../1st-proof-of-concept/game-admin.html      |  416 +++
 playground/1st-proof-of-concept/game.html     |  383 +++
 .../1st-proof-of-concept/package-lock.json    | 2935 +++++++++++++++++
 playground/1st-proof-of-concept/package.json  |   24 +
 playground/1st-proof-of-concept/server.js     |  228 ++
 9 files changed, 3993 insertions(+), 1 deletion(-)
 create mode 100644 playground/1st-proof-of-concept/100-collect.mp3
 create mode 100644 playground/1st-proof-of-concept/collect.mp3
 create mode 100644 playground/1st-proof-of-concept/game-admin.html
 create mode 100644 playground/1st-proof-of-concept/game.html
 create mode 100644 playground/1st-proof-of-concept/package-lock.json
 create mode 100644 playground/1st-proof-of-concept/package.json
 create mode 100644 playground/1st-proof-of-concept/server.js

diff --git a/.gitignore b/.gitignore
index ad46b308..a8ff1e7d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+.DS_Store
+
 # Logs
 logs
 *.log
diff --git a/README.md b/README.md
index 4b417581..220b7d08 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,6 @@
 # meu-primeiro-jogo-multiplayer
-Um jogo multiplayer bastante simples para testarmos o Socket.io
+Um jogo multiplayer bastante simples para testarmos o Socket.io.
+
+Tudo que foi desenvolvido nessa versão é uma POC para eu entender o que eu precisava aprender sobre o desenvolvimento de um jogo multiplayer. Várias coisas foram ignoradas, principalmente autenticação.
+
+Para mais informações, veja esse vídeo: https://www.youtube.com/watch?v=0sTfIZvjYJk
\ No newline at end of file
diff --git a/playground/1st-proof-of-concept/100-collect.mp3 b/playground/1st-proof-of-concept/100-collect.mp3
new file mode 100644
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diff --git a/playground/1st-proof-of-concept/collect.mp3 b/playground/1st-proof-of-concept/collect.mp3
new file mode 100644
index 0000000000000000000000000000000000000000..6c02ef7290e6c29be68db1229b5058d27e4747b2
GIT binary patch
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diff --git a/playground/1st-proof-of-concept/game-admin.html b/playground/1st-proof-of-concept/game-admin.html
new file mode 100644
index 00000000..0c062a82
--- /dev/null
+++ b/playground/1st-proof-of-concept/game-admin.html
@@ -0,0 +1,416 @@
+<html>
+    <head>
+        <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
+        <meta http-equiv="Pragma" content="no-cache" />
+        <meta http-equiv="Expires" content="0" />
+        <meta charset="utf-8">
+        <title>Meu Primeiro Jogo Multiplayer</title>
+        <script src="/socket.io/socket.io.js"></script>
+
+        <style>
+            body {
+                margin: 40px 0 0 0;
+                padding: 0;
+                background-color: #EEE;
+                text-align: center;
+            }
+
+            #game-canvas {
+                image-rendering: pixelated;
+                image-rendering: crisp-edges;
+                image-rendering: -moz-crisp-edges;
+                -webkit-box-shadow: 0px 4px 17px 0px rgba(0,0,0,0.19);
+                -moz-box-shadow: 0px 4px 17px 0px rgba(0,0,0,0.19);
+                box-shadow: 0px 4px 17px 0px rgba(0,0,0,0.19);
+                margin-bottom: 20px;
+                margin-left: 20px;
+                margin-right: 20px;
+                display: inline-block;
+                vertical-align: top;
+            }
+
+            #score-table {
+                font-size: 13px;
+                vertical-align: top;
+                display: inline-block;
+                font-family: Arial, Helvetica, sans-serif
+            }
+
+            #score-table tr.header td {
+                border-bottom: 1px solid #CCC;
+                padding-bottom: 8px;
+            }
+
+            #score-table tr.footer td {
+                border-top: 1px solid #CCC;
+                font-size: 11px;
+            }
+
+            #score-table td {
+                padding-top: 5px;
+                padding-bottom: 5px;
+            }
+
+            #score-table .socket-id {
+                font-weight: normal;
+                color: #222;
+                width: 150px;
+                white-space: nowrap;
+                overflow: hidden;
+                text-overflow: ellipsis;
+                display: inline-block
+            }
+
+            #score-table .score-value {
+                font-weight: bold;
+                color: #000;
+                text-align: right;
+            }
+
+            #score-table .current-player .socket-id,
+            #score-table .current-player .score-value {
+                color: #bdaa27;
+            }
+
+        </style>
+    </head>
+    <body>
+
+        <canvas id="game-canvas"></canvas>
+        <table id="score-table"></table>
+
+            <style>
+                #admin {
+                    padding-right: 200px;
+                }
+                #admin input,
+                #admin button {
+                    width: 120px;
+                    height: 30px;
+                    text-align: center;
+                    margin-bottom: 10px;
+                }
+            </style>
+            <div id="admin">
+                <div>
+                    <input type="text" value=2000 id="fruitGameInterval"><br>
+                    <button type="button" onclick="startFruitGame()">Start Fruits</button><br>
+                    <button type="button" onclick="stopFruitGame()">Stop Fruits</button>
+                </div> 
+
+                <br>
+                <div>
+                    <button type="button" onclick="startCrazyMode()">Start Crazy Mode</button><br>
+                    <button type="button" onclick="stopCrazyMode()">Stop Crazy Mode</button><br>
+                </div>
+
+                <br>
+                <div>
+                    <button type="button" onclick="clearScores()">Clear Scores</button><br>
+                </div>
+
+                <br>
+                <div>
+                    <input type="text" value=15 id="maxConcurrentConnections"><br>
+                    <button type="button" onclick="setMaxConcurrentConnections()">Set Concurrent Connections</button><br>
+                </div> 
+    
+            </div>
+    </div>
+
+        <script>
+            let connected = false
+            const socket = io({
+                query: {
+                    admin: true
+                }
+            })
+            let game
+            const scoreTable = document.getElementById('score-table')
+            const gameCanvas = document.getElementById('game-canvas')
+            let totalPlayersCount = ''
+            const collectFruitAudio = new Audio('collect.mp3')
+            const collect100FruitAudio = new Audio('100-collect.mp3')
+            
+            socket.on('connect', () => {
+                connected = true
+                console.log('> Connected to server')
+            })
+
+            socket.on('disconnect', () => {
+                console.log('> Disconnected')
+                connected = false
+            })
+
+            socket.on('bootstrap', (gameInitialState) => {
+                game = gameInitialState
+                console.log('> Received initial state')
+                gameCanvas.style.width = `${game.canvasWidth * 18}px`
+                gameCanvas.style.height = `${game.canvasHeight * 18}px`
+                gameCanvas.width = game.canvasWidth
+                gameCanvas.height = game.canvasHeight
+
+                const context = gameCanvas.getContext('2d')
+
+                requestAnimationFrame(renderGame)
+
+                function renderGame() {
+                    const allPixels = game.canvasWidth * game.canvasHeight
+                    
+                    context.globalAlpha = 1
+                    context.fillStyle = 'white'
+                    context.fillRect(0, 0, game.canvasWidth, game.canvasHeight)
+
+                    for (const socketId in game.players) {
+                        const player = game.players[socketId]
+                        context.fillStyle = '#000000'
+                        context.globalAlpha = 0.1
+                        context.fillRect(player.x, player.y, 1, 1)
+                    }
+
+                    for (const fruitId in game.fruits) {
+                        const fruit = game.fruits[fruitId]
+                        context.fillStyle = '#08a331'
+                        context.globalAlpha = 1
+                        context.fillRect(fruit.x, fruit.y, 1, 1)
+                    }
+
+                    const currentPlayer = game.players[socket.id]
+                    context.fillStyle = '#F0DB4F'
+                    context.globalAlpha = 1
+                    context.fillRect(currentPlayer.x, currentPlayer.y, 1, 1)
+
+
+                    requestAnimationFrame(renderGame)
+                }
+
+                updateScoreTable()
+            })
+
+            socket.on('player-update', (player) => {
+                game.players[player.socketId] = player.newState
+            })
+
+            socket.on('update-player-score', (score) => {
+                game.players[socket.id].score = score
+                updateScoreTable()
+            })
+
+            socket.on('player-remove', (socketId) => {
+                delete game.players[socketId]
+            })
+
+            socket.on('fruit-add', (fruit) => {
+                game.fruits[fruit.fruitId] = {
+                    x: fruit.x,
+                    y: fruit.y
+                }
+            })
+
+            socket.on('fruit-remove', ({fruitId, score}) => {
+                delete game.fruits[fruitId]
+                multipleOf100Remainder = score % 100
+
+                if (multipleOf100Remainder !== 0) {
+                    collectFruitAudio.pause()
+                    collectFruitAudio.currentTime = 0
+                    collectFruitAudio.play().catch(console.log)
+                }
+
+                if (multipleOf100Remainder === 0 && score !== 0) {
+                    collectFruitAudio.pause()
+                    collect100FruitAudio.pause()
+                    collect100FruitAudio.currentTime = 0
+                    collect100FruitAudio.play().catch(console.log)
+                }
+
+                updateScoreTable()
+            })
+
+            socket.on('concurrent-connections', (concurrentConnections) => {
+                totalPlayersCount = concurrentConnections
+                updateScoreTable()
+            })
+
+            let crazyModeInterval
+            socket.on('start-crazy-mode', () => {
+                crazyModeInterval = setInterval(() => {
+                    const randomKey = 37 + Math.floor(Math.random()*4)
+                    console.log(randomKey)
+                    const event = new KeyboardEvent('keydown', {
+                        keyCode: randomKey,
+                        which: randomKey
+                    })
+
+                    document.dispatchEvent(event);
+                }, 150)
+            })
+
+            socket.on('stop-crazy-mode', () => {
+                clearInterval(crazyModeInterval)
+            })
+
+            function updateScoreTable() {
+                const maxResults = 10
+                
+                let scoreTableInnerHTML = `
+                    <tr class="header">
+                        <td>Top 10 Jogadores</td>
+                        <td>Pontos</td>
+                    </tr>
+                `
+                const scoreArray = []
+
+                for (socketId in game.players) {
+                    const player = game.players[socketId]
+                    scoreArray.push({
+                        socketId: socketId,
+                        score: player.score
+                    })
+                }
+
+                const scoreArraySorted = scoreArray.sort((first, second) => {
+                    if (first.score < second.score) {
+                        return 1
+                    }
+
+                    if (first.score > second.score) {
+                        return -1
+                    }
+
+                    return 0
+                })
+
+                const scoreSliced = scoreArraySorted.slice(0, maxResults)
+
+
+                scoreSliced.forEach((score) => {
+
+                    scoreTableInnerHTML += `
+                        <tr class="${ socket.id === score.socketId ? 'current-player' : ''}">
+                            <td class="socket-id">${score.socketId}</td>
+                            <td class="score-value">${score.score}</td>
+                        </tr>
+                    `
+                })
+
+                let playerNotInTop10 = true
+
+                for (const score of scoreSliced) {
+                    if (socket.id === score.socketId) {
+                        playerNotInTop10 = false
+                        break
+                    }
+                    
+                    playerNotInTop10 = true
+                }
+
+                if (playerNotInTop10) {
+                    scoreTableInnerHTML += `
+                        <tr class="current-player bottom">
+                            <td class="socket-id">${socket.id}</td>
+                            <td class="score-value">${game.players[socket.id].score}</td>
+                        </tr>
+                    `
+                }
+
+                scoreTableInnerHTML += `
+                    <tr class="footer">
+                        <td>Total de jogadores</td>
+                        <td align="right">${totalPlayersCount}</td>
+                    </tr>
+                `
+
+                scoreTable.innerHTML = scoreTableInnerHTML
+                
+            }
+
+            function handleKeydown(event) {
+                if (connected) {
+                    const player = game.players[socket.id]
+
+                    if (event.which === 37 && player.x - 1 >= 0) {
+                        player.x = player.x - 1
+                        socket.emit('player-move', 'left')
+                        return
+                    }
+
+                    if (event.which === 38 && player.y - 1 >= 0) {
+                        player.y = player.y - 1
+                        socket.emit('player-move', 'up')
+                        return
+                    }
+
+                    if (event.which === 39 && player.x + 1 < game.canvasWidth) {
+                        player.x = player.x + 1
+                        socket.emit('player-move', 'right')
+                        return
+                    }
+                    if (event.which === 40 && player.y + 1 < game.canvasHeight) {
+                        player.y = player.y + 1
+                        socket.emit('player-move', 'down')
+                        return
+                    }
+                }
+            }
+
+            function throttle(callback, delay) {
+                let isThrottled = false, args, context;
+
+                function wrapper() {
+                    if (isThrottled) {
+                    args = arguments;
+                    context = this;
+                    return;
+                    }
+
+                    isThrottled = true;
+                    callback.apply(this, arguments);
+                    
+                    setTimeout(() => {
+                    isThrottled = false;
+                    if (args) {
+                        wrapper.apply(context, args);
+                        args = context = null;
+                    }
+                    }, delay);
+                }
+
+                return wrapper;
+                }
+
+            const throttledKeydown = throttle(handleKeydown, 80)
+
+            document.addEventListener('keydown', throttledKeydown)
+
+            /* ADMIN */
+            function startFruitGame() {
+                const interval = document.getElementById('fruitGameInterval').value
+                console.log(interval)
+                socket.emit('admin-start-fruit-game', interval)
+            }
+
+            function stopFruitGame() {
+                socket.emit('admin-stop-fruit-game')
+            }
+
+            function startCrazyMode() {
+                socket.emit('admin-start-crazy-mode')
+            }
+
+            function stopCrazyMode() {
+                socket.emit('admin-stop-crazy-mode')
+            }
+
+            function clearScores() {
+                socket.emit('admin-clear-scores')
+            }
+
+            function setMaxConcurrentConnections() {
+                const maxConcurrentConnections = document.getElementById('maxConcurrentConnections').value
+                socket.emit('admin-concurrent-connections', maxConcurrentConnections)
+            }
+
+        </script>
+    </body>
+</html>
\ No newline at end of file
diff --git a/playground/1st-proof-of-concept/game.html b/playground/1st-proof-of-concept/game.html
new file mode 100644
index 00000000..9f25dac6
--- /dev/null
+++ b/playground/1st-proof-of-concept/game.html
@@ -0,0 +1,383 @@
+<html>
+    <head>
+        <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
+        <meta http-equiv="Pragma" content="no-cache" />
+        <meta http-equiv="Expires" content="0" />
+        <meta charset="utf-8">
+        <title>Meu Primeiro Jogo Multiplayer</title>
+        <script src="/socket.io/socket.io.js"></script>
+
+        <style>
+            body {
+                margin: 40px 0 0 0;
+                padding: 0;
+                background-color: #EEE;
+                text-align: center;
+            }
+
+            #game-canvas {
+                image-rendering: pixelated;
+                image-rendering: crisp-edges;
+                image-rendering: -moz-crisp-edges;
+                -webkit-box-shadow: 0px 4px 17px 0px rgba(0,0,0,0.19);
+                -moz-box-shadow: 0px 4px 17px 0px rgba(0,0,0,0.19);
+                box-shadow: 0px 4px 17px 0px rgba(0,0,0,0.19);
+                margin-bottom: 20px;
+                margin-left: 20px;
+                margin-right: 20px;
+                display: inline-block;
+                vertical-align: top;
+            }
+
+            #score-table {
+                font-size: 13px;
+                vertical-align: top;
+                display: inline-block;
+                font-family: Arial, Helvetica, sans-serif
+            }
+
+            #score-table tr.header td {
+                border-bottom: 1px solid #CCC;
+                padding-bottom: 8px;
+            }
+
+            #score-table tr.footer td {
+                border-top: 1px solid #CCC;
+                font-size: 11px;
+            }
+
+            #score-table td {
+                padding-top: 5px;
+                padding-bottom: 5px;
+            }
+
+            #score-table .socket-id {
+                font-weight: normal;
+                color: #222;
+                width: 150px;
+                white-space: nowrap;
+                overflow: hidden;
+                text-overflow: ellipsis;
+                display: inline-block
+            }
+
+            #score-table .score-value {
+                font-weight: bold;
+                color: #000;
+                text-align: right;
+            }
+
+            #score-table .current-player .socket-id,
+            #score-table .current-player .score-value {
+                color: #bdaa27;
+            }
+
+            #max-concurrent-connection-message {
+                background-color: #F0DB4F;
+                border: 1px solid #000;
+                text-align:center;
+                margin: auto;
+                margin: 100px;
+                padding: 50px;
+                top: 0;
+                right: 0;
+                bottom: 0;
+                left: 0;
+                font-family: Arial, Helvetica, sans-serif;
+                display: none;
+            }
+        </style>
+    </head>
+    <body>
+
+        <div id="max-concurrent-connection-message">
+            <h1>Número máximo de conexões atingida!</h1>
+            <h2>(não feche esta página)</h2>
+            <p>Apesar do número máximo ter sido atingido, esta página ficará tentando reconectar em background automaticamente. Assim que aumentarmos o número de conexões, você não precisará fazer nada para reconectar e começar a jogar com a turma!</p>
+        </div>
+        <div id="game-container">
+            <canvas id="game-canvas"></canvas>
+            <table id="score-table"></table>        
+        </div>
+
+    </div>
+
+        <script>
+            let connected = false
+            const socket = io({
+                reconnectionDelay: 10000,
+                reconnectionDelayMax: 15000
+            })
+            let game
+            const scoreTable = document.getElementById('score-table')
+            const gameCanvas = document.getElementById('game-canvas')
+            let totalPlayersCount = ''
+            const collectFruitAudio = new Audio('collect.mp3')
+            const collect100FruitAudio = new Audio('100-collect.mp3')
+            
+            socket.on('connect', () => {
+                connected = true
+                console.log('> Connected to server')
+            })
+
+            socket.on('disconnect', () => {
+                console.log('> Disconnected')
+                connected = false
+            })
+
+            socket.on('bootstrap', (gameInitialState) => {
+                game = gameInitialState
+                console.log('> Received initial state')
+                gameCanvas.style.width = `${game.canvasWidth * 18}px`
+                gameCanvas.style.height = `${game.canvasHeight * 18}px`
+                gameCanvas.width = game.canvasWidth
+                gameCanvas.height = game.canvasHeight
+
+                const context = gameCanvas.getContext('2d')
+
+                requestAnimationFrame(renderGame)
+
+                function renderGame() {
+                    const allPixels = game.canvasWidth * game.canvasHeight
+                    
+                    context.globalAlpha = 1
+                    context.fillStyle = 'white'
+                    context.fillRect(0, 0, game.canvasWidth, game.canvasHeight)
+
+                    for (const socketId in game.players) {
+                        const player = game.players[socketId]
+                        context.fillStyle = '#000000'
+                        context.globalAlpha = 0.1
+                        context.fillRect(player.x, player.y, 1, 1)
+                    }
+
+                    for (const fruitId in game.fruits) {
+                        const fruit = game.fruits[fruitId]
+                        context.fillStyle = '#08a331'
+                        context.globalAlpha = 1
+                        context.fillRect(fruit.x, fruit.y, 1, 1)
+                    }
+
+                    const currentPlayer = game.players[socket.id]
+                    context.fillStyle = '#F0DB4F'
+                    context.globalAlpha = 1
+                    context.fillRect(currentPlayer.x, currentPlayer.y, 1, 1)
+
+
+                    requestAnimationFrame(renderGame)
+                }
+
+                updateScoreTable()
+            })
+
+            socket.on('player-update', (player) => {
+                game.players[player.socketId] = player.newState
+            })
+
+            socket.on('update-player-score', (score) => {
+                game.players[socket.id].score = score
+                updateScoreTable()
+            })
+
+            socket.on('player-remove', (socketId) => {
+                delete game.players[socketId]
+            })
+
+            socket.on('fruit-add', (fruit) => {
+                game.fruits[fruit.fruitId] = {
+                    x: fruit.x,
+                    y: fruit.y
+                }
+            })
+
+            socket.on('fruit-remove', ({fruitId, score}) => {
+                delete game.fruits[fruitId]
+                multipleOf100Remainder = score % 100
+
+                if (multipleOf100Remainder !== 0) {
+                    collectFruitAudio.pause()
+                    collectFruitAudio.currentTime = 0
+                    collectFruitAudio.play()
+                }
+
+                if (multipleOf100Remainder === 0 && score !== 0) {
+                    collectFruitAudio.pause()
+                    collect100FruitAudio.pause()
+                    collect100FruitAudio.currentTime = 0
+                    collect100FruitAudio.play()
+                }
+
+                updateScoreTable()
+            })
+
+            socket.on('concurrent-connections', (concurrentConnections) => {
+                totalPlayersCount = concurrentConnections
+                updateScoreTable()
+            })
+
+            let crazyModeInterval
+            socket.on('start-crazy-mode', () => {
+                crazyModeInterval = setInterval(() => {
+                    const randomKey = 37 + Math.floor(Math.random()*4)
+                    console.log(randomKey)
+                    const event = new KeyboardEvent('keydown', {
+                        keyCode: randomKey,
+                        which: randomKey
+                    })
+
+                    document.dispatchEvent(event);
+                }, 150)
+            })
+
+            socket.on('stop-crazy-mode', () => {
+                clearInterval(crazyModeInterval)
+            })
+
+            socket.on('show-max-concurrent-connections-message', () => {
+                document.getElementById('max-concurrent-connection-message').style.display = 'block'
+                document.getElementById('game-container').style.display = 'none'
+            })
+
+            socket.on('hide-max-concurrent-connections-message', () => {
+                document.getElementById('max-concurrent-connection-message').style.display = 'none'
+                document.getElementById('game-container').style.display = 'block'
+            })
+
+            function updateScoreTable() {
+                const maxResults = 10
+                
+                let scoreTableInnerHTML = `
+                    <tr class="header">
+                        <td>Top 10 Jogadores</td>
+                        <td>Pontos</td>
+                    </tr>
+                `
+                const scoreArray = []
+
+                for (socketId in game.players) {
+                    const player = game.players[socketId]
+                    scoreArray.push({
+                        socketId: socketId,
+                        score: player.score
+                    })
+                }
+
+                const scoreArraySorted = scoreArray.sort((first, second) => {
+                    if (first.score < second.score) {
+                        return 1
+                    }
+
+                    if (first.score > second.score) {
+                        return -1
+                    }
+
+                    return 0
+                })
+
+                const scoreSliced = scoreArraySorted.slice(0, maxResults)
+
+                scoreSliced.forEach((score) => {
+
+                    scoreTableInnerHTML += `
+                        <tr class="${ socket.id === score.socketId ? 'current-player' : ''}">
+                            <td class="socket-id">${score.socketId}</td>
+                            <td class="score-value">${score.score}</td>
+                        </tr>
+                    `
+                })
+                
+                let playerNotInTop10 = true
+
+                for (const score of scoreSliced) {
+                    if (socket.id === score.socketId) {
+                        playerNotInTop10 = false
+                        break
+                    }
+                    
+                    playerNotInTop10 = true
+                }
+
+                if (playerNotInTop10) {
+                    scoreTableInnerHTML += `
+                        <tr class="current-player bottom">
+                            <td class="socket-id">${socket.id}</td>
+                            <td class="score-value">${game.players[socket.id].score}</td>
+                        </tr>
+                    `
+                }
+
+                scoreTableInnerHTML += `
+                    <tr class="footer">
+                        <td>Total de jogadores</td>
+                        <td align="right">${totalPlayersCount}</td>
+                    </tr>
+                `
+
+                scoreTable.innerHTML = scoreTableInnerHTML
+                
+                
+            }
+
+            function handleKeydown(event) {
+                if (connected) {
+                    const player = game.players[socket.id]
+
+                    if (event.which === 37 && player.x - 1 >= 0) {
+                        player.x = player.x - 1
+                        socket.emit('player-move', 'left')
+                        return
+                    }
+
+                    if (event.which === 38 && player.y - 1 >= 0) {
+                        player.y = player.y - 1
+                        socket.emit('player-move', 'up')
+                        return
+                    }
+
+                    if (event.which === 39 && player.x + 1 < game.canvasWidth) {
+                        player.x = player.x + 1
+                        socket.emit('player-move', 'right')
+                        return
+                    }
+                    if (event.which === 40 && player.y + 1 < game.canvasHeight) {
+                        player.y = player.y + 1
+                        socket.emit('player-move', 'down')
+                        return
+                    }
+                }
+            }
+
+            // Essa lógica deveria estar no server.
+            // Como está no front, é fácil burlar.
+            function throttle(callback, delay) {
+                let isThrottled = false, args, context;
+
+                function wrapper() {
+                    if (isThrottled) {
+                    args = arguments;
+                    context = this;
+                    return;
+                    }
+
+                    isThrottled = true;
+                    callback.apply(this, arguments);
+                    
+                    setTimeout(() => {
+                    isThrottled = false;
+                    if (args) {
+                        wrapper.apply(context, args);
+                        args = context = null;
+                    }
+                    }, delay);
+                }
+
+                return wrapper;
+                }
+
+            const throttledKeydown = throttle(handleKeydown, 80)
+
+            document.addEventListener('keydown', throttledKeydown)
+
+        </script>
+    </body>
+</html>
\ No newline at end of file
diff --git a/playground/1st-proof-of-concept/package-lock.json b/playground/1st-proof-of-concept/package-lock.json
new file mode 100644
index 00000000..0b835f76
--- /dev/null
+++ b/playground/1st-proof-of-concept/package-lock.json
@@ -0,0 +1,2935 @@
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+}
diff --git a/playground/1st-proof-of-concept/package.json b/playground/1st-proof-of-concept/package.json
new file mode 100644
index 00000000..9f0182c6
--- /dev/null
+++ b/playground/1st-proof-of-concept/package.json
@@ -0,0 +1,24 @@
+{
+  "name": "meu-primeiro-jogo-multiplayer",
+  "version": "1.0.0",
+  "description": "Um jogo multiplayer bastante simples para testarmos o Socket.io",
+  "scripts": {
+    "start": "nodemon source/server.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/filipedeschamps/meu-primeiro-jogo-multiplayer.git"
+  },
+  "author": "",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/filipedeschamps/meu-primeiro-jogo-multiplayer/issues"
+  },
+  "homepage": "https://github.com/filipedeschamps/meu-primeiro-jogo-multiplayer#readme",
+  "dependencies": {
+    "express": "^4.17.1",
+    "nodemon": "^1.19.1",
+    "socket.io": "^2.2.0"
+  }
+}
diff --git a/playground/1st-proof-of-concept/server.js b/playground/1st-proof-of-concept/server.js
new file mode 100644
index 00000000..fd0a3870
--- /dev/null
+++ b/playground/1st-proof-of-concept/server.js
@@ -0,0 +1,228 @@
+console.log('> Script started')
+const express = require('express')
+const webApp = express()
+const webServer = require('http').createServer(webApp)
+const io = require('socket.io')(webServer)
+
+const game = createGame()
+let maxConcurrentConnections = 15
+
+webApp.get('/', function(req, res){
+  res.sendFile(__dirname + '/game.html')
+})
+
+// Coisas que só uma POC vai conhecer
+webApp.get('/a31ecc0596d72f84e5ee403ddcacb3dea94ce0803fc9e6dc2eca1fbabae49a3e3a31ecc0596d72f84e5ee40d0cacb3dea94ce0803fc9e6dc2ecfdfdbabae49a3e3', function(req, res){
+  res.sendFile(__dirname + '/game-admin.html')
+})
+
+webApp.get('/collect.mp3', function(req, res){
+  res.sendFile(__dirname + '/collect.mp3')
+})
+
+webApp.get('/100-collect.mp3', function(req, res){
+  res.sendFile(__dirname + '/100-collect.mp3')
+})
+
+setInterval(() => {
+  io.emit('concurrent-connections', io.engine.clientsCount)
+}, 5000)
+
+
+io.on('connection', function(socket){
+  const admin = socket.handshake.query.admin
+
+  if (io.engine.clientsCount > maxConcurrentConnections && !admin) {
+    socket.emit('show-max-concurrent-connections-message')
+    socket.conn.close()
+    return
+  } else {
+    socket.emit('hide-max-concurrent-connections-message')
+  }
+  const playerState = game.addPlayer(socket.id)
+  socket.emit('bootstrap', game)
+
+  socket.broadcast.emit('player-update', {
+    socketId: socket.id,
+    newState: playerState
+  })
+
+  socket.on('player-move', (direction) => {
+    game.movePlayer(socket.id, direction)
+
+    const fruitColisionIds = game.checkForFruitColision()
+
+    socket.broadcast.emit('player-update', {
+      socketId: socket.id,
+      newState: game.players[socket.id]
+    })
+
+    if (fruitColisionIds) {
+      io.emit('fruit-remove', {
+        fruitId: fruitColisionIds.fruitId,
+        score: game.players[socket.id].score
+      })
+      socket.emit('update-player-score', game.players[socket.id].score)
+    }
+
+  })
+
+  socket.on('disconnect', () => {
+    game.removePlayer(socket.id)
+    socket.broadcast.emit('player-remove', socket.id)
+  })
+
+
+  let fruitGameInterval
+  socket.on('admin-start-fruit-game', (interval) => {
+    console.log('> Fruit Game start')
+    clearInterval(fruitGameInterval)
+
+    fruitGameInterval = setInterval(() => {
+      const fruitData = game.addFruit()
+
+      if (fruitData) {
+        io.emit('fruit-add', fruitData)
+      }
+    }, interval)
+  })
+
+  socket.on('admin-stop-fruit-game', () => {
+    console.log('> Fruit Game stop')
+    clearInterval(fruitGameInterval)
+  })
+
+  socket.on('admin-start-crazy-mode', () => {
+    io.emit('start-crazy-mode')
+  })
+
+  socket.on('admin-stop-crazy-mode', () => {
+    io.emit('stop-crazy-mode')
+  })
+
+  socket.on('admin-clear-scores', () => {
+    game.clearScores()
+    io.emit('bootstrap', game)
+  })
+
+  socket.on('admin-concurrent-connections', (newConcurrentConnections) => {
+    maxConcurrentConnections = newConcurrentConnections
+  })
+
+});
+
+webServer.listen(80, function(){
+  console.log('> Server listening on port:',80)
+});
+
+function createGame() {
+  console.log('> Starting new game')
+  let fruitGameInterval
+
+  const game = {
+    canvasWidth: 35,
+    canvasHeight: 30,
+    players: {},
+    fruits: {},
+    addPlayer,
+    removePlayer,
+    movePlayer,
+    addFruit,
+    removeFruit,
+    checkForFruitColision,
+    clearScores
+  }
+
+  function addPlayer(socketId) {
+    return game.players[socketId] = {
+      x: Math.floor(Math.random() * game.canvasWidth),
+      y: Math.floor(Math.random() * game.canvasHeight),
+      score: 0
+    }
+  }
+
+  function removePlayer(socketId) {
+    delete game.players[socketId] 
+  }
+
+  function movePlayer(socketId, direction) {
+    const player = game.players[socketId]
+
+    if (direction === 'left' && player.x - 1 >= 0) {
+      player.x = player.x - 1
+    }
+
+    if (direction === 'up' && player.y - 1 >= 0) {
+      player.y = player.y - 1
+    }
+
+    if (direction === 'right' && player.x + 1 < game.canvasWidth) {
+      player.x = player.x + 1
+    }
+
+    if (direction === 'down' && player.y + 1 < game.canvasHeight) {
+      player.y = player.y + 1
+    }
+    
+    return player
+  }
+
+  function addFruit() {
+    const fruitRandomId = Math.floor(Math.random() * 10000000)
+    const fruitRandomX = Math.floor(Math.random() * game.canvasWidth)
+    const fruitRandomY = Math.floor(Math.random() * game.canvasHeight)
+
+    for (fruitId in game.fruits) {
+      const fruit = game.fruits[fruitId]
+
+      if (fruit.x === fruitRandomX && fruit.y === fruitRandomY) {
+        return false
+      }
+
+    }
+
+    game.fruits[fruitRandomId] = {
+      x: fruitRandomX,
+      y: fruitRandomY
+    }
+
+    return {
+      fruitId: fruitRandomId,
+      x: fruitRandomX,
+      y: fruitRandomY
+    }  
+
+  }
+
+  function removeFruit(fruitId) {
+    delete game.fruits[fruitId]
+  }
+
+  function checkForFruitColision() {
+    for (fruitId in game.fruits) {
+      const fruit = game.fruits[fruitId]
+      
+      for (socketId in game.players) {
+        const player = game.players[socketId]
+
+        if (fruit.x === player.x && fruit.y === player.y) {
+          player.score = player.score + 1
+          game.removeFruit(fruitId)
+
+          return {
+            socketId: socketId,
+            fruitId: fruitId
+          }
+        }
+      }
+    }
+  }
+
+  function clearScores() {
+    for (socketId in game.players) {
+      game.players[socketId].score = 0
+    }  
+  }
+
+  return game
+}
\ No newline at end of file