Added goToNearbyStone and isStoneNearby to SnakeBot.java

src/SnakeBot.java

@@ -13,6 +13,7 @@
 public class SnakeBot extends Bot{
     String moves = "";
     private int spiralNumber = 0;
+    private boolean goesForward = true;
     private boolean ignoreStones = false;
     public static void main(String[] args) {
         Bot snakeBot = new SnakeBot(args);
@@ -22,7 +23,8 @@ public class SnakeBot extends Bot{
     protected SnakeBot(String[] args) {
         super(args);
     }
-    //@TODO: find a better way to avoid collectedStones
+    //@TODO: find a better way to avoid collected stones
+    //@TODO: find a better way to collect stones
     protected char nextMove(View view) {
         boolean stoneDetected = view.data.contains("@");
         char nextMove;
@@ -35,18 +37,47 @@ public class SnakeBot extends Bot{
             nextMove = (countCollectedStonesLeft(view) <= countCollectedStonesRight(view)) ? '<' : '>';
             ignoreStones = true;
         }
-        /*
-         * @TODO:
-         * Avoiding endless loops due to trying to collect two stones at once.
-         * Problem: stones located near to each other are ignored.
-         * Tested: 20 tries; avgScore = 25.45/32; minScore = 19; maxScore = 29; trapped 1/20.
-         */
+
         if(countUncollectedStones(view) > 1) ignoreStones = true;
         if(countCollectedStones(view) <= 2 && countUncollectedStones(view) <= 1) ignoreStones = false;
 
+        if(isStoneNearby(view)){
+            nextMove = goToNearbyStone(view);
+        }
+
         return nextMove;
     }
 
+    private boolean isStoneNearby(View view){
+        int centerCoordinateOfView = view.width / 2;
+        int frontCellIndex = calculateCharIndexFromCoordinates(view.width, centerCoordinateOfView, centerCoordinateOfView - 1);
+        int leftCellIndex = calculateCharIndexFromCoordinates(view.width, centerCoordinateOfView - 1, centerCoordinateOfView);
+        int rightCellIndex = calculateCharIndexFromCoordinates(view.width, centerCoordinateOfView + 1, centerCoordinateOfView);
+
+        boolean stoneIsInFront = view.data.charAt(frontCellIndex) == '@';
+        boolean stoneIsOnTheLeft = view.data.charAt(leftCellIndex) == '@';
+        boolean stoneIsOneTheRight = view.data.charAt(rightCellIndex) == '@';
+
+        return stoneIsInFront || stoneIsOnTheLeft || stoneIsOneTheRight;
+    }
+
+    private char goToNearbyStone(View view){
+        int centerCoordinateOfView = view.width / 2;
+        int frontCellIndex = calculateCharIndexFromCoordinates(view.width, centerCoordinateOfView, centerCoordinateOfView - 1);
+        int leftCellIndex = calculateCharIndexFromCoordinates(view.width, centerCoordinateOfView - 1, centerCoordinateOfView);
+        int rightCellIndex = calculateCharIndexFromCoordinates(view.width, centerCoordinateOfView + 1, centerCoordinateOfView);
+
+        if(view.data.charAt(frontCellIndex) == '@') return '^';
+        if(view.data.charAt(leftCellIndex) == '@') return '<';
+        if(view.data.charAt(rightCellIndex) == '@') return '>';
+        return 0;
+    }
+
+    private void resetMoves() {
+        moves = "";
+        spiralNumber = 0;
+    }
+
     private int countUncollectedStones(View view) {
         int count = 0;
 
@@ -131,4 +162,15 @@ public class SnakeBot extends Bot{
 
         return rightStones;
     }
+
+    private char walkByColumns(View view) {
+        if(moves.isEmpty()){
+            moves = "^".repeat(28);
+            moves += (goesForward ? ">" + "^".repeat(view.width) + ">" : "<" + "^".repeat(view.width) + "<");
+            goesForward = !goesForward;
+        }
+        char nextMove = moves.charAt(0);
+        moves = moves.substring(1);
+        return nextMove;
+    }
 }