Bot divin en cours de création

fr/iut_fbleau/Bot/DivineBot.java

@@ -18,5 +18,175 @@ import java.util.*;
  *
  * Objectif : trop fort. */
 public class DivineBot{
+    private final Player me;
+    private final int maxDepth;
+    private final Random rng = new Random();
 
+    public DivineBot(Player p, int maxDepth) {
+        super(p);
+        this.me = p;
+        this.maxDepth = Math.max(1, maxDepth);
+    }
+
+    // ===================== COUP À JOUER =====================
+
+    @Override
+    public AbstractPly giveYourMove(IBoard board) {
+
+        if (board == null || board.isGameOver()) return null;
+
+        List<AbstractPly> moves = listMoves(board);
+        if (moves.isEmpty()) return null;
+
+        boolean isMax = board.getCurrentPlayer() == me;
+
+        int bestValue = isMax ? Integer.MIN_VALUE : Integer.MAX_VALUE;
+        List<AbstractPly> bestMoves = new ArrayList<>();
+
+        int alpha = Integer.MIN_VALUE;
+        int beta = Integer.MAX_VALUE;
+
+        for (AbstractPly m : moves) {
+            IBoard next = board.safeCopy();
+            next.doPly(m);
+
+            int value = alphaBeta(next, maxDepth - 1, alpha, beta);
+
+            if (isMax) {
+                if (value > bestValue) {
+                    bestValue = value;
+                    bestMoves.clear();
+                    bestMoves.add(m);
+                } else if (value == bestValue) {
+                    bestMoves.add(m);
+                }
+                alpha = Math.max(alpha, bestValue);
+            } else {
+                if (value < bestValue) {
+                    bestValue = value;
+                    bestMoves.clear();
+                    bestMoves.add(m);
+                } else if (value == bestValue) {
+                    bestMoves.add(m);
+                }
+                beta = Math.min(beta, bestValue);
+            }
+        }
+
+        return bestMoves.get(rng.nextInt(bestMoves.size()));
+    }
+
+    // ===================== ALPHA-BETA =====================
+
+    private int alphaBeta(IBoard board, int depth, int alpha, int beta) {
+
+        if (board.isGameOver()) {
+            return terminalValue(board);
+        }
+
+        if (depth == 0) {
+            return evaluate(board);
+        }
+
+        List<AbstractPly> moves = listMoves(board);
+        if (moves.isEmpty()) {
+            return evaluate(board);
+        }
+
+        boolean isMax = board.getCurrentPlayer() == me;
+
+        if (isMax) {
+            int best = Integer.MIN_VALUE;
+            for (AbstractPly m : moves) {
+                IBoard next = board.safeCopy();
+                next.doPly(m);
+
+                int val = alphaBeta(next, depth - 1, alpha, beta);
+                best = Math.max(best, val);
+                alpha = Math.max(alpha, best);
+
+                if (alpha >= beta) break;
+            }
+            return best;
+        } else {
+            int best = Integer.MAX_VALUE;
+            for (AbstractPly m : moves) {
+                IBoard next = board.safeCopy();
+                next.doPly(m);
+
+                int val = alphaBeta(next, depth - 1, alpha, beta);
+                best = Math.min(best, val);
+                beta = Math.min(beta, best);
+
+                if (alpha >= beta) break;
+            }
+            return best;
+        }
+    }
+
+    // ===================== TERMINAL =====================
+
+    private int terminalValue(IBoard board) {
+        Result r = board.getResult();
+        if (r == null) return 0;
+
+        boolean botIsP1 = (me == Player.PLAYER1);
+
+        if (r == Result.DRAW) return 0;
+
+        if (botIsP1) {
+            return (r == Result.WIN) ? 100000 : -100000;
+        } else {
+            return (r == Result.LOSS) ? 100000 : -100000;
+        }
+    }
+
+    // ===================== ÉVALUATEUR =====================
+
+    /**
+     * Évaluateur heuristique Avalam :
+     * - tours finales > quasi finales > stables > faibles
+     * - approximation du score final
+     */
+    private int evaluate(IBoard board) {
+
+        if (!(board instanceof AvalamBoard)) return 0;
+        AvalamBoard b = (AvalamBoard) board;
+
+        Color myColor = (me == Player.PLAYER1) ? Color.YELLOW : Color.RED;
+        Color oppColor = (me == Player.PLAYER1) ? Color.RED : Color.YELLOW;
+
+        int score = 0;
+
+        for (int r = 0; r < AvalamBoard.SIZE; r++) {
+            for (int c = 0; c < AvalamBoard.SIZE; c++) {
+
+                Tower t = b.getTowerAt(r, c);
+                if (t == null) continue;
+
+                int h = t.getHeight();
+                int value;
+
+                if (h == 5) value = 1000;      // tour gagnée
+                else if (h == 4) value = 300;  // quasi gagnée
+                else if (h == 3) value = 120;  // stable
+                else if (h == 2) value = 40;
+                else value = 10;
+
+                if (t.getColor() == myColor) score += value;
+                else if (t.getColor() == oppColor) score -= value;
+            }
+        }
+
+        return score;
+    }
+
+    // ===================== OUTILS =====================
+
+    private List<AbstractPly> listMoves(IBoard board) {
+        List<AbstractPly> moves = new ArrayList<>();
+        Iterator<AbstractPly> it = board.iterator();
+        while (it.hasNext()) moves.add(it.next());
+        return moves;
+    }
 }