public static Frame Create(
Ball ball1,
Ball ball2)
{
if (ball1 == null)
{
throw new ArgumentNullException(nameof(ball1));
}
if (ball2 == null)
{
throw new ArgumentNullException(nameof(ball2));
}
if (ball1.IsSpare || ball1.IsStrike || ball2.IsSpare || ball2.IsStrike)
{
throw new ArgumentException("Not spare or strike frame cannot be composed of spare or strike balls");
}
if (ball1.PinsKnockedDown + ball2.PinsKnockedDown > 9)
{
throw new ArgumentException("Not spare or strike frame must knock 9 pins at most");
}
return new Frame
{
Ball1 = ball1,
Ball2 = ball2,
};
}
public static Frame CreateSpare(
Ball ball1)
{
if (ball1 == null)
{
throw new ArgumentNullException(nameof(ball1));
}
if (ball1.IsSpare || ball1.IsStrike)
{
throw new ArgumentException("First ball in spare frame cannot be spare or strike ball");
}
return new Frame
{
Ball1 = ball1,
Ball2 = Ball.CreateSpare(10 - ball1.PinsKnockedDown),
};
}