From 21e1763e3dd2e6b6d82612de55821831156d8f61 Mon Sep 17 00:00:00 2001
From: Pierre Hubert <pierre.git@communiquons.org>
Date: Mon, 23 Mar 2020 15:37:56 +0100
Subject: [PATCH] V0 is working

---
 levels/1.json |  3 +-
 levels/2.json |  4 +--
 script.js     | 81 +++++++++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 82 insertions(+), 6 deletions(-)

diff --git a/levels/1.json b/levels/1.json
index d91f5e7..a226939 100644
--- a/levels/1.json
+++ b/levels/1.json
@@ -10,6 +10,7 @@
     ],
     "snake": [
         [4,2], [4,1], [3,1], [2,1]
-    ]
+    ],
+    "firstKey": "ArrowRight"
 
 }
\ No newline at end of file
diff --git a/levels/2.json b/levels/2.json
index 13904ff..4f34203 100644
--- a/levels/2.json
+++ b/levels/2.json
@@ -13,6 +13,6 @@
       [6,6],
       [6,5],
       [6,4]
-    ]
-
+    ],
+    "firstKey": "ArrowRight"
 }
\ No newline at end of file
diff --git a/script.js b/script.js
index ac805dd..e8f3986 100644
--- a/script.js
+++ b/script.js
@@ -113,6 +113,8 @@ async function startGame(gameID) {
         snake.push([s[0]-1, s[1]-1]);
     })
 
+    // Initialize pressed key
+    let key = level.firstKey;
 
     /**
      * Step function
@@ -122,10 +124,69 @@ async function startGame(gameID) {
      */
     let interval = setInterval(() => step(), level.delay);
     function step() {
-        console.log("render")
-
+        
+        // Check if a game was destroyed
         if(!canvas.isConnected)
             clearInterval(interval)
+
+        // Move the snake if required
+        if(key) {
+            let newHead = Array.from(snake[snake.length-1]);
+            let increaseSize = false;
+
+            // Make the snake move
+            switch(key) {
+                case "ArrowDown":
+                    newHead[0]++;
+                    break;
+                
+                case "ArrowUp":
+                    newHead[0]--;
+                    break;
+                
+                case "ArrowLeft":
+                    newHead[1]--;
+                    break;
+                
+                case "ArrowRight":
+                    newHead[1]++;
+                    break;
+            }
+            
+
+            if(newHead[0] < 0 || newHead[1] < 0 || 
+                newHead[0] >= level.dimensions[0] || newHead[1] >= level.dimensions[1]) {
+                gameOver();
+                return;
+            }
+
+            // Trigger appropriate action
+            switch(map[newHead[0]][newHead[1]]) {
+
+                case FOOD:
+                    increaseSize = true;
+                    break;
+                
+                case WALL:
+                    gameOver();
+                    break;
+
+            }
+
+            // Push new snake position
+            snake.push(newHead);
+            map[newHead[0]][newHead[1]] = SNAKE
+            
+            // Remove the end of the snake if he has not eaten anything
+            if(!increaseSize) {
+                const oldPos = snake.shift()
+                map[oldPos[0]][oldPos[1]] = EMPTY
+            }
+
+        }
+
+
+        
         
         // Redraw screen
         ctx.clearRect(0, 0, canvas.width, canvas.height)
@@ -174,7 +235,6 @@ async function startGame(gameID) {
                                 0, // startAngle
                                 2*Math.PI) // End angle
                             ctx.fill();
-                            console.log(x, y)
                         }
                             
 
@@ -186,6 +246,21 @@ async function startGame(gameID) {
             }
         }
     }
+
+    /**
+     * Call this function once the user loose the game
+     */
+    function gameOver() {
+        clearInterval(interval);
+        alert("Game over !!!");
+        location.href = "#";
+    }
+
+    // Listen for key press events
+    document.body.addEventListener("keydown", (ev) => {
+        if(["ArrowDown", "ArrowLeft", "ArrowRight", "ArrowUp"].includes(ev.key))
+            key = ev.key;
+    });
 }
 
 /**