internal Maybe <GameState> ActionPlayer(int colDelta, int rowDelta)
{
var actionTo = Player.LevelPosition + new Point(colDelta, rowDelta);
var maybeCell = Dungeon.GetCell(actionTo);
if (!maybeCell.HasValue)
{
return(Maybe.None <GameState>());
}
var c = maybeCell.Value;
if (!c.LetterTile.HasValue && !c.Occupant.HasValue)
{
return(Maybe.None <GameState>());
}
if (c.Occupant.HasValue)
{
var occupant = c.Occupant.Value;
if (occupant is DownStairs)
{
var d = Dungeon.Descend();
if (!d.HasValue)
{
return(Maybe.None <GameState>());
}
return(new GameState(
d.Value,
Player.SetPosition(c.Position),
TilePlacer
));
}
//}
//else if (occupant is UpStairs)
//{
// var d = Dungeon.Ascend();
// if (!d.HasValue) return Maybe.None<GameState>();
// return new GameState(
// d.Value,
// Player.SetPosition(c.Position),
// TilePlacer
// );
//}
}
//if (maybeCell.HasValue && !maybeCell.Value.LetterTile.HasValue)
//{
// return new GameState(
// Dungeon,
// Player,
// new TilePlacer(
// maybeCell.Value.Position,
// Player,
// colDelta != 0 ? TilePlacementDir.Row : TilePlacementDir.Col,
// Enumerable.Empty<Maybe<LetterTile>>()
// ));
//}
return(maybeCell.Bind(cell =>
Player
.Action(cell)
.Select(playerAndCell => new GameState(
Dungeon.ReplaceCell(playerAndCell.Item2),
playerAndCell.Item1,
TilePlacer
))
));
}
