public ISolvedSquaresResult SolveSquares(IPartiallyCompleteGroup partiallyCompleteForGroup)
{
var filteredCombinations = this.FilterCombinations(partiallyCompleteForGroup);
if (filteredCombinations.Count == 0)
{
return new CantBeSolvedResult();
}
if (filteredCombinations.Count == 1)
{
return new SolvedSquares.SolvedSquaresResult(filteredCombinations.First());
}
var partiallyComplete = new PartiallyCompleteGroup(filteredCombinations.First());
foreach (var possibleCombination in filteredCombinations)
{
partiallyComplete = partiallyComplete.Merge(new PartiallyCompleteGroup(possibleCombination));
}
if (partiallyComplete.Equals(partiallyCompleteForGroup))
{
return new NothingSolvedThisRoundResult(partiallyCompleteForGroup);
}
return new PartiallySolvedSquaresResult(partiallyComplete);
}
public List<BitGroup> FilterCombinations(IPartiallyCompleteGroup partiallyCompleteForGroup)
{
return this.AllCombinations().Where(partiallyCompleteForGroup.GroupMatchesKnownSquares).ToList();
}
public NothingSolvedThisRoundResult(IPartiallyCompleteGroup partiallyCompleteForGroup)
{
this.partiallyCompleteForGroup = partiallyCompleteForGroup;
}