public Set<Move> getAllowedMoves() {
// If there is already a winn
if (gipfBoardState.players.winner() != null) {
return Collections.emptySet();
}
// Create a set of incomplete moves containing the starting positions and directions for the
// current piece
Set<Move> potentialMoves = getPotentialStartMoves(getCurrentPiece());
// If the current piece is a GIPF piece, the player is also allowed to place normal pieces.
if (getCurrentPiece().getPieceType() == GIPF)
potentialMoves.addAll(
getPotentialStartMoves(Piece.of(NORMAL, getCurrentPiece().getPieceColor())));
// These moves are marked as complete so a temporary game won't ask for user input.
potentialMoves.stream().forEach(m -> m.isCompleteMove = true);
Set<Move> potentialMovesIncludingLineSegmentRemoval = new HashSet<>();
for (Move potentialMove : potentialMoves) {
try {
Map<Position, Piece> temporaryPieceMap = new HashMap<>(getGipfBoardState().getPieceMap());
temporaryPieceMap.put(potentialMove.startPos, potentialMove.addedPiece);
movePiecesTowards(
temporaryPieceMap, potentialMove.getStartingPosition(), potentialMove.getDirection());
Set<List<Pair<PieceColor, Line.Segment>>> RLineOrderingsSet =
getRemovableLineOrderingsSetFromGipfBoard(
temporaryPieceMap, getCurrentPiece().getPieceColor());
if (RLineOrderingsSet.size() > 0) {
for (List<Pair<PieceColor, Line.Segment>> RLineOrdering : RLineOrderingsSet) {
Set<Position> piecesToWhite = new HashSet<>();
Set<Position> piecesToBlack = new HashSet<>();
Set<Position> piecesRemoved = new HashSet<>();
for (Pair<PieceColor, Line.Segment> RLine : RLineOrdering) {
Line.Segment removedSegment = RLine.getValue();
// The color of the player who removed the line
PieceColor colorRemoved = RLine.getKey();
// Determine per segment to whom the pieces are given. Pieces can only be given to the
// player
// who removed the line, or deleted from the game.
Set<Position> occupiedPositions =
removedSegment.getOccupiedPositions(temporaryPieceMap);
Set<Position> piecesFromSegmentBackToReserve =
occupiedPositions
.stream()
.filter(
position ->
temporaryPieceMap.get(position).getPieceColor() == colorRemoved)
.collect(toSet());
Set<Position> piecesFromSegmentRemoved =
occupiedPositions
.stream()
.filter(position -> !piecesFromSegmentBackToReserve.contains(position))
.collect(toSet());
if (colorRemoved == WHITE) piecesToWhite.addAll(piecesFromSegmentBackToReserve);
if (colorRemoved == BLACK) piecesToBlack.addAll(piecesFromSegmentBackToReserve);
piecesRemoved.addAll(piecesFromSegmentRemoved);
}
// And finally add the move
// the constructor will define this as a complete move, because all the parameters have
// a value.
potentialMovesIncludingLineSegmentRemoval.add(
new Move(
potentialMove.addedPiece,
potentialMove.startPos,
potentialMove.direction,
piecesToWhite,
piecesToBlack,
piecesRemoved));
}
} else {
// If no line segments can be removed, just add the original move
potentialMovesIncludingLineSegmentRemoval.add(potentialMove);
}
} catch (InvalidMoveException e) {
// We don't consider this move if it is invalid
}
}
return potentialMovesIncludingLineSegmentRemoval;
}
