81 lines
2.9 KiB
Java
81 lines
2.9 KiB
Java
package backend;
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import java.util.ArrayList;
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import java.util.Random;
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public class AutoPlayer {
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public Move computeBestMove(Board board) {
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boolean isWhite = board.isTurnWhite();
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ArrayList<Move> allMoves = new ArrayList<>();
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ArrayList<Piece> pieces = board.getPieces();
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for (int i = 0; i < pieces.size(); i++) {
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Piece piece = pieces.get(i);
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if (piece.isWhite() == isWhite) {
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ArrayList<int[]> moves = board.getValidMoves(piece);
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for (int j = 0; j < moves.size(); j++) {
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int[] moveCoords = moves.get(j);
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int toX = moveCoords[0];
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int toY = moveCoords[1];
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int fromX = piece.getX();
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int fromY = piece.getY();
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Piece captured = board.getPieceAt(toX, toY);
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// Detect en passant
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if (piece.getType() == PieceType.Pawn && board.isEnPassant() && toX == board.getXCoordinatePawn() &&
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toY == (piece.isWhite() ? board.getYCoordinatePawn() - 1 : board.getYCoordinatePawn() + 1)) {
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captured = board.getPieceAt(board.getXCoordinatePawn(), board.getYCoordinatePawn());
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}
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// --- Castling detection ---
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if (piece.getType() == PieceType.King && Math.abs(toX - fromX) == 2 && toY == fromY) {
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System.out.println("AI considering castling move.");
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// No need to set captured, just allow the move
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}
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Move move = new Move(piece, piece.getX(), piece.getY(), toX, toY, captured);
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allMoves.add(move);
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}
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}
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}
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if (allMoves.isEmpty()) {
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return null; // no legal moves → maybe stalemate or checkmate
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}
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// === Basic Evaluation: Prefer capturing higher-value pieces ===
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Move bestMove = allMoves.get(0);
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int bestScore = evaluateCapture(bestMove.getCaptured());
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for (int i = 1; i < allMoves.size(); i++) {
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Move move = allMoves.get(i);
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int score = evaluateCapture(move.getCaptured());
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if (score > bestScore) {
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bestMove = move;
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bestScore = score;
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}
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}
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return bestMove;
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}
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// Simple evaluation: return value of captured piece, or 0 if no capture
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private int evaluateCapture(Piece captured) {
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if (captured == null) return 0;
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PieceType type = captured.getType();
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if (type == PieceType.Pawn) return 1;
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if (type == PieceType.Knight || type == PieceType.Bishop) return 3;
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if (type == PieceType.Rook) return 5;
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if (type == PieceType.Queen) return 9;
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return 0; // king shouldn't be captured anyway
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}
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} |