AI TTT merge to ServerManager branche (#24)

* AI made and also a minor change to core board

* Minor changes to the AI, Gamebase changed a little to make some stuff public for usability, TTT changed a few things to public too and making the tests for the AI

* New test on the AI

* fixed some questionable styling in my code

* fixed some questionable styling in omar's code!

* fixed some questionable styling in omar's code! v2

* Update src/main/java/org/toop/game/MinMaxTTT.java

* Wrong value, was 9x9 grid, is now 3x3 grid

---------

Co-authored-by: michiel <m.brands.3@st.hanze.nl>

src/test/java/MinMaxTTTTest.java

@@ -0,0 +1,78 @@
+
+import org.junit.jupiter.api.Test;
+import org.toop.game.MinMaxTTT;
+import org.toop.game.TTT;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class MinMaxTTTTest {
+
+    // makegame makes a board situation so we can test the ai. thats it really, the rest is easy to follow id say
+    private TTT makeGame(String board, int currentPlayer) {
+        TTT game = new TTT("AI", "Human");
+        // Fill the board
+        for (int i = 0; i < board.length(); i++) {
+            char c = board.charAt(i);
+            game.grid[i] = c;
+            if (c != ' ') game.moveCount++;
+        }
+        game.currentPlayer = currentPlayer;
+        return game;
+    }
+
+    @Test
+    void testFindBestMove_AIImmediateWin() {
+        TTT game = makeGame("XX OO    ", 0);
+        MinMaxTTT ai = new MinMaxTTT();
+        int bestMove = ai.findBestMove(game);
+        assertEquals(2, bestMove, "AI has to take winning move at 2");
+    }
+
+    @Test
+    void testFindBestMove_BlockOpponentWin() {
+        TTT game = makeGame("OO X    ", 0); // 0 = AI's turn
+        MinMaxTTT ai = new MinMaxTTT();
+        int bestMove = ai.findBestMove(game);
+        assertEquals(2, bestMove, "AI should block opponent win at 2");
+    }
+
+    @Test
+    void testFindBestMove_ChooseDrawIfNoWin() {
+        TTT game = makeGame("XOXOX O  ", 0);
+        MinMaxTTT ai = new MinMaxTTT();
+        int bestMove = ai.findBestMove(game);
+        assertTrue(bestMove == 6 || bestMove == 8, "AI should draw");
+    }
+
+    @Test
+    void testMinimax_ScoreWin() {
+        TTT game = makeGame("XXX      ", 0);
+        MinMaxTTT ai = new MinMaxTTT();
+        int score = ai.doMinimax(game, 5, false);
+        assertTrue(score > 0, "AI win scored positively");
+    }
+
+    @Test
+    void testMinimax_ScoreLoss() {
+        TTT game = makeGame("OOO      ", 1);
+        MinMaxTTT ai = new MinMaxTTT();
+        int score = ai.doMinimax(game, 5, true);
+        assertTrue(score < 0, "AI loss is negative");
+    }
+
+    @Test
+    void testMinimax_ScoreDraw() {
+        TTT game = makeGame("XOXOXOOXO", 0);
+        MinMaxTTT ai = new MinMaxTTT();
+        int score = ai.doMinimax(game, 5, true);
+        assertEquals(0, score, "Draw should be zero!");
+    }
+
+    @Test
+    void testMiniMax_MultipleMoves() {
+        TTT game = makeGame(" X OX  O ", 0);
+        MinMaxTTT ai = new MinMaxTTT();
+        int bestMove = ai.findBestMove(game);
+        assertTrue(bestMove == 0 || bestMove == 2, "Can look at multiple moves!");
+    }
+}