Labbcomplete

app/src/main/java/labbar/Board.java

@@ -7,7 +7,8 @@ public class Board {
     private String winner_id = null;
 
     public Optional<String> getWinnder() {
-        if (winner_id == null) return Optional.empty();
+        if (winner_id == null)
+            return Optional.empty();
         return Optional.of(winner_id);
     }
 
@@ -16,21 +17,16 @@ public class Board {
     }
 
     public void takePins(int pins) {
-        this.pins -= Math.min(2, pins);
-        this.pins = Math.max(0, this.pins);
+        this.pins -= Math.min(this.pins, Math.min(2, pins));
     }
 
-    public void alert(String userId, int pins) {
-        if(this.pins <= 0) System.out.println(userId + String.format(" picks %d and wins!", pins));
-        else System.out.println(userId + " took " + pins + " pins.");
-    }
-
-    public void printState() {
-        printState(false);
-    }
-    public void printState(boolean lineBreak) {
-        System.out.println("There are " + this.pins + " pins left.");
-        if (lineBreak) System.out.println();
+    public int alert(String userId, int pins) {
+        if (this.pins <= 0)
+            UserInterface.printMessage(String.format("%s picks %d and wins!", userId, pins));
+        else
+            UserInterface.printMessage(String.format(
+                    "%s picks %d pins.\n%d pins remaining.", userId, pins, this.pins));
+        return 0;
     }
 
     // GetPinsAmount

app/src/main/java/labbar/ComputerPlayer.java

@@ -8,10 +8,8 @@ public class ComputerPlayer extends Player {
     @Override
     int takePins(Board board) {
         int n = Math.min(
-                (int) (Math.random()*2 + 1), // Random int between 1 and 2
-                board.getNoPins()
-                );
-        System.out.println(n);
+                (int) (Math.random() * 2 + 1), // Random int between 1 and 2
+                board.getNoPins());
         board.takePins(n);
         board.alert(this.getUserId(), n);
         return n;

app/src/main/java/labbar/HumanPlayer.java

@@ -1,7 +1,5 @@
 package labbar;
 
-import javax.swing.JOptionPane;
-
 public class HumanPlayer extends Player {
     HumanPlayer(String userId) {
         super(userId);
@@ -9,14 +7,10 @@ public class HumanPlayer extends Player {
 
     @Override
     int takePins(Board board) {
-        // Filter all non-digits from the input
-        String input = JOptionPane.showInputDialog("How many pins do you want to take?").chars()
-            .filter(Character::isDigit)
-            .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
-            .toString();
+        int input = UserInterface.askForInt("How many pins do you want to take?");
+        if(input < 0) return input; // Propagate input
+        int i = Math.min(board.getNoPins(), Math.min(2, input)); // Clamp input
 
-        
-        int i = Math.max(board.getNoPins(), Math.min(2, Integer.parseInt(input))); // "Should" never throw given input is sanitized
         board.takePins(i);
         board.alert(this.getUserId(), i);
         return i;

app/src/main/java/labbar/TakePinsGame.java

@@ -1,18 +1,27 @@
 package labbar;
+import java.util.ArrayList;
+import java.util.List;
 
 public class TakePinsGame {
+    static void abort(String message) {
+        System.out.println(message);
+        System.exit(0);
+    }
+
     public static void main(String[] args) {
         Board board = new Board();
         board.setUp(10);
-        board.printState();
+        // board.printState();
 
-        Player player = new ComputerPlayer("Human");
-        Player cpu = new ComputerPlayer("Computer");
+        List<Player> players = new ArrayList<Player>();
+        players.add(new HumanPlayer("Human"));
+        players.add(new ComputerPlayer("Siri"));
+        players.add(new ComputerPlayer("Hal"));
 
-        for(boolean playerTurn = true; board.getNoPins() > 0; playerTurn = !playerTurn) {
-            if(playerTurn) player.takePins(board);
-            else cpu.takePins(board);
-            board.printState(true);
+        if(players.size() < 2) abort("Not enough players");
+
+        for (int index = 0; board.getNoPins() > 0; index = (index + 1) % players.size()) {
+            if(players.get(index).takePins(board) < 0) abort("User aborted game");
         }
     }
 }

app/src/main/java/labbar/UserInterface.java

@@ -0,0 +1,27 @@
+package labbar;
+
+import javax.swing.JOptionPane;
+
+
+public class UserInterface {
+    public static void printMessage(String message) {
+        JOptionPane.showMessageDialog(null, message);
+    }
+
+    public static int askForInt(String message) {
+        String input = JOptionPane.showInputDialog(message);
+        if (input == null) return -2;
+
+        // Shadow input
+        input = input.chars()
+            .filter(Character::isDigit)
+            .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
+            .toString();
+
+        try {
+            return Integer.parseInt(input);
+        } catch (NumberFormatException e) {
+            return -1;
+        }
+    }
+}

app/src/test/java/labbar/PlayerTests.java

@@ -7,17 +7,15 @@ class PlayerTests{
     @Test void fullCpuGameTest() {
         Board b = new Board();
 
-        // Unreasonable amount of pins
-        b.setUp(500);
+        b.setUp(10);
         
         // Two computer players
-        Player player_a = new ComputerPlayer("Siri");
-        Player player_b = new ComputerPlayer("Hal");
+        Player player_a = new ComputerPlayer("Cortana");
+        Player player_b = new ComputerPlayer("Alexa");
 
         for(boolean playerTurn = true; b.getNoPins() > 0; playerTurn = !playerTurn) {
             if(playerTurn)  player_a.takePins(b);
             else            player_b.takePins(b);
-            b.printState();
         }
 
         assertEquals(0, b.getNoPins());