public static GameState MoveCursor(GameState current, MineField mineField, Direction direction)
{
return(current.Do(
current
.CursorPosition
.Move(direction, mineField.Size)));
}
public static GameState Uncover(GameState current, MineField mineField)
{
return(current.Do(
current
.Covers()
.UncoverDeep(mineField, current.CursorPosition)));
}
public static GameState Quit(GameState current, MineField mineField)
{
return(current.Do(
current
.Covers()
.UncoverRange(
mineField.Mines())));
}
public GameResult Evaluate(MineField mineField)
{
var covers = Covers();
return(new GameResult(
mineField
.Mines()
.Any(mine => !covers.IsCovered(mine)),
covers.CoverCount() - mineField.Mines().Count()));
}
private static Covers UncoverDeep(
this Covers covers,
MineField mineField,
Point point)
{
if (!covers.IsCovered(point))
{
return(covers);
}
if (!mineField.IsEmptyAt(point))
{
return(covers.Uncover(point));
}
return(point
.Neighbours(mineField.Size)
.Aggregate(
covers.Uncover(point),
(current, neighbor) => current.UncoverDeep(mineField, neighbor)));
}
public static GameState Start(MineField mineField)
{
return(GameState.Create(Covers.Create(mineField.Size)));
}