w

ai-client/src/main/java/com/lona/tictactoe/client/Main.java

@@ -279,33 +279,133 @@ public class Main extends JFrame {
     private void makeAiMove() {
         new Thread(() -> {
             try {
-                Thread.sleep(2000); // Wait 2s
+                Thread.sleep(1500); // Slightly faster
+
+                // 1. Try Simple Rule-Based / Minimax first (guarantees better play)
+                // If we want "AI" feel, we can use LLM, but for "winning", logic is better.
+                // Let's mix them. Use LLM but with VERY specific instructions,
+                // and if it fails or returns invalid, fall back to smart move.
 
                 String prompt = buildPrompt();
-                System.out.println("Sending Prompt to AI:\n" + prompt);
+                System.out.println("Sending Prompt to AI...");
 
                 String response = callOpenRouter(prompt);
                 System.out.println("AI Response: " + response);
 
-                // Parse response: expecting row, col
-                // The prompt will ask specifically for "row col" format
                 String[] coords = parseCoordinates(response);
                 if (coords != null) {
-                    send("MOVE " + coords[0] + " " + coords[1]);
+                    int r = Integer.parseInt(coords[0]);
+                    int c = Integer.parseInt(coords[1]);
+                    // Validate move locally before sending
+                    if (isValidMove(r, c)) {
+                        send("MOVE " + r + " " + c);
+                    } else {
+                        System.err.println("AI suggested invalid move. Using Minimax fallback.");
+                        makeSmartMove();
+                    }
                 } else {
-                    System.err.println("Failed to parse AI move. Retrying random...");
-                    makeRandomMove();
+                    System.err.println("Failed to parse AI move. Using Minimax fallback.");
+                    makeSmartMove();
                 }
 
             } catch (Exception e) {
                 e.printStackTrace();
-                makeRandomMove();
+                makeSmartMove();
             }
         }).start();
     }
 
+    private boolean isValidMove(int r, int c) {
+        if (r < 0 || r > 2 || c < 0 || c > 2)
+            return false;
+        return boardState[r * 3 + c] == ' ';
+    }
+
+    private void makeSmartMove() {
+        // Simple Minimax or Rule-based
+        int bestScore = Integer.MIN_VALUE;
+        int move = -1;
+
+        // Convert boardState to something easier
+        char[] board = boardState.clone();
+
+        for (int i = 0; i < 9; i++) {
+            if (board[i] == ' ') {
+                board[i] = mySymbol;
+                int score = minimax(board, 0, false);
+                board[i] = ' ';
+                if (score > bestScore) {
+                    bestScore = score;
+                    move = i;
+                }
+            }
+        }
+
+        if (move != -1) {
+            int r = move / 3;
+            int c = move % 3;
+            send("MOVE " + r + " " + c);
+        } else {
+            makeRandomMove();
+        }
+    }
+
+    private char getOpponentSymbol() {
+        return (mySymbol == 'X') ? 'O' : 'X';
+    }
+
+    private int minimax(char[] board, int depth, boolean isMaximizing) {
+        char result = checkWinner(board);
+        if (result == mySymbol)
+            return 10 - depth;
+        if (result == getOpponentSymbol())
+            return depth - 10;
+        if (result == 'D')
+            return 0; // Draw
+
+        if (isMaximizing) {
+            int bestScore = Integer.MIN_VALUE;
+            for (int i = 0; i < 9; i++) {
+                if (board[i] == ' ') {
+                    board[i] = mySymbol;
+                    int score = minimax(board, depth + 1, false);
+                    board[i] = ' ';
+                    bestScore = Math.max(score, bestScore);
+                }
+            }
+            return bestScore;
+        } else {
+            int bestScore = Integer.MAX_VALUE;
+            for (int i = 0; i < 9; i++) {
+                if (board[i] == ' ') {
+                    board[i] = getOpponentSymbol();
+                    int score = minimax(board, depth + 1, true);
+                    board[i] = ' ';
+                    bestScore = Math.min(score, bestScore);
+                }
+            }
+            return bestScore;
+        }
+    }
+
+    private char checkWinner(char[] b) {
+        int[][] wins = {
+                { 0, 1, 2 }, { 3, 4, 5 }, { 6, 7, 8 }, // rows
+                { 0, 3, 6 }, { 1, 4, 7 }, { 2, 5, 8 }, // cols
+                { 0, 4, 8 }, { 2, 4, 6 } // diags
+        };
+        for (int[] w : wins) {
+            if (b[w[0]] != ' ' && b[w[0]] == b[w[1]] && b[w[1]] == b[w[2]]) {
+                return b[w[0]];
+            }
+        }
+        for (int i = 0; i < 9; i++)
+            if (b[i] == ' ')
+                return ' '; // Not finished
+        return 'D'; // Draw
+    }
+
     private void makeRandomMove() {
-        // Fallback: pick first empty spot
         for (int i = 0; i < 9; i++) {
             if (boardState[i] == ' ') {
                 int r = i / 3;
@@ -318,17 +418,19 @@ public class Main extends JFrame {
 
     private String buildPrompt() {
         StringBuilder sb = new StringBuilder();
-        sb.append("Play Tic-Tac-Toe as '").append(mySymbol).append("'.\n");
-        sb.append("Board:\n");
+        sb.append("You are an unbeatable Tic-Tac-Toe AI. You are player '").append(mySymbol).append("'.\n");
+        sb.append("Current Board State (row, col):\n");
         for (int i = 0; i < 3; i++) {
             for (int j = 0; j < 3; j++) {
                 char c = boardState[i * 3 + j];
-                sb.append(c == ' ' ? '_' : c).append(" ");
+                sb.append("[").append(i).append(",").append(j).append("]=").append(c == ' ' ? "EMPTY" : c).append("  ");
             }
             sb.append("\n");
         }
         sb.append(
-                "Respond ONLY with the coordinates of your next move in JSON format: {\"row\": <0-2>, \"col\": <0-2>}. Do not add any other text.");
+                "\nYour goal is to WIN. If you cannot win immediately, BLOCK the opponent. If neither, play optimally to force a draw.\n");
+        sb.append("Analyze the board carefully. Don't make random moves.\n");
+        sb.append("Respond with JSON ONLY: {\"row\": <row>, \"col\": <col>}");
         return sb.toString();
     }
 

ai-client/target/maven-archiver/pom.properties

@@ -1,5 +1,5 @@
 #Generated by Maven
-#Tue Feb 10 14:17:06 CET 2026
+#Tue Feb 10 14:20:59 CET 2026
 artifactId=ai-client
 groupId=com.lona.tictactoe
 version=1.0-SNAPSHOT

web-client/src/main/resources/static/js/app.js

@@ -113,6 +113,46 @@ function resetGame() {
     statusDiv.style.color = '#10b981';
 }
 
+const visibleDebug = document.getElementById('visible-debug');
+
+function log(text) {
+    if (!visibleDebug) return;
+    const now = new Date().toLocaleTimeString();
+    visibleDebug.innerHTML += `<div>[${now}] ${text}</div>`;
+    console.log(text);
+}
+
+function connect() {
+    const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+    const url = `${protocol}//${window.location.host}/game`;
+    log(`Connecting to WebSocket: ${url}`);
+
+    ws = new WebSocket(url);
+
+    ws.onopen = () => {
+        log('WebSocket: OnOpen fired. Connected.');
+        statusDiv.textContent = 'Connected to Server';
+        statusDiv.style.color = '#10b981';
+    };
+
+    ws.onclose = (event) => {
+        log(`WebSocket: OnClose fired. Code: ${event.code}, Reason: ${event.reason}`);
+        statusDiv.textContent = 'Disconnected. Reconnecting...';
+        statusDiv.style.color = '#ef4444';
+        setTimeout(connect, 2000);
+    };
+
+    ws.onerror = (error) => {
+        log(`WebSocket: OnError fired. State: ${ws.readyState}`);
+        console.error("WebSocket Error:", error);
+    };
+
+    ws.onmessage = (event) => {
+        // log(`Received: ${event.data}`); // don't log every message to avoid spam
+        handleMessage(event.data);
+    };
+}
+
 function updateBoard(boardStr) {
     cells.forEach((cell, i) => {
         if (i < boardStr.length) {

web-client/src/main/resources/templates/index.html

@@ -58,7 +58,13 @@
                 <button id="leave-btn" class="btn secondary">Leave Lobby</button>
                 <button id="surrender-btn" class="btn danger">Surrender</button>
             </div>
+
+            <div id="debug-log"
+                style="margin-top: 20px; font-size: 0.8rem; color: #555; text-align: left; max-height: 200px; overflow-y: auto; border: 1px solid #333; padding: 10px; display: none;">
+            </div>
         </div>
+
+        <div id="visible-debug" style="margin-top: 20px; color: #666; font-size: 0.8rem;"></div>
     </div>
 
     <script src="/js/app.js"></script>

web-client/target/classes/static/js/app.js

@@ -113,6 +113,46 @@ function resetGame() {
     statusDiv.style.color = '#10b981';
 }
 
+const visibleDebug = document.getElementById('visible-debug');
+
+function log(text) {
+    if (!visibleDebug) return;
+    const now = new Date().toLocaleTimeString();
+    visibleDebug.innerHTML += `<div>[${now}] ${text}</div>`;
+    console.log(text);
+}
+
+function connect() {
+    const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+    const url = `${protocol}//${window.location.host}/game`;
+    log(`Connecting to WebSocket: ${url}`);
+
+    ws = new WebSocket(url);
+
+    ws.onopen = () => {
+        log('WebSocket: OnOpen fired. Connected.');
+        statusDiv.textContent = 'Connected to Server';
+        statusDiv.style.color = '#10b981';
+    };
+
+    ws.onclose = (event) => {
+        log(`WebSocket: OnClose fired. Code: ${event.code}, Reason: ${event.reason}`);
+        statusDiv.textContent = 'Disconnected. Reconnecting...';
+        statusDiv.style.color = '#ef4444';
+        setTimeout(connect, 2000);
+    };
+
+    ws.onerror = (error) => {
+        log(`WebSocket: OnError fired. State: ${ws.readyState}`);
+        console.error("WebSocket Error:", error);
+    };
+
+    ws.onmessage = (event) => {
+        // log(`Received: ${event.data}`); // don't log every message to avoid spam
+        handleMessage(event.data);
+    };
+}
+
 function updateBoard(boardStr) {
     cells.forEach((cell, i) => {
         if (i < boardStr.length) {

web-client/target/classes/templates/index.html

@@ -58,7 +58,13 @@
                 <button id="leave-btn" class="btn secondary">Leave Lobby</button>
                 <button id="surrender-btn" class="btn danger">Surrender</button>
             </div>
+
+            <div id="debug-log"
+                style="margin-top: 20px; font-size: 0.8rem; color: #555; text-align: left; max-height: 200px; overflow-y: auto; border: 1px solid #333; padding: 10px; display: none;">
+            </div>
         </div>
+
+        <div id="visible-debug" style="margin-top: 20px; color: #666; font-size: 0.8rem;"></div>
     </div>
 
     <script src="/js/app.js"></script>