package backend;

import java.util.List;
import java.util.Random;

public class AutoPlayer {
    private final Random rnd = new Random();

    private int valueOf(PieceType t) {
        switch (t) {
            case Pawn:   return 1;
            case Knight:
            case Bishop: return 3;
            case Rook:   return 5;
            case Queen:  return 9;
            default:     return 0;
        }
    }

    /** Greedy‐capture AI with random tie‐break */
    public Move computeBestMove(Board board) {
        List<Move> moves = ChessRules.generateLegalMoves(board, board.isTurnWhite());
        if (moves.isEmpty()) return null;

        int bestScore = Integer.MIN_VALUE;
        Move best = null;
        for (Move m : moves) {
            int score = (m.getCapturedPiece()==null ? 0 : valueOf(m.getCapturedPiece().getType()));
            if (score > bestScore || (score==bestScore && rnd.nextBoolean())) {
                bestScore = score;
                best = m;
            }
        }
        return best;
    }
}