/// <summary>
/// Validates the scorecard.
/// </summary>
public static bool IsValid(ScoreCard scoreCard)
{
// Check if the number of frames has exceeded the maximum allowed.
if (IsBeyondExtraRound(scoreCard.Length))
{
return(false);
}
// Validates the extra round
if (scoreCard.Length == BowlingGameExtenstions.NUM_OF_REGULAR_ROUNDS + BowlingGameExtenstions.EXTRA_ROUNDS)
{
int currentFrameIndex = scoreCard.Length - 1;
// get the frame's type of the previous round.
FrameTypeEnum previousFrameType = GetFrameType(scoreCard, currentFrameIndex - 1);
// if the last round is Spare, then having a second try in the extra round is an invalid move.
if (previousFrameType == FrameTypeEnum.Spare &&
scoreCard.GetFrame(currentFrameIndex).Try2 > 0)
{
return(false);
}
}
// validate rest of the frames
return(AreFramesValid(scoreCard, scoreCard.Length - 1));
}
/// <summary>
/// Validating a set of frames.
/// The validation is based on recursion, to adhere the Functional Programming principles.
/// </summary>
private static bool AreFramesValid(ScoreCard scoreCards, int length)
{
// if the scorecard is empty - it is valid.
if (length <= 0)
{
return(true);
}
// return the validity status of the current frames and the rest of the following frames.
return((scoreCards.GetFrame(length)?.IsValid() ?? false) &&
AreFramesValid(scoreCards, length - 1));
}