actionmaster script

public Action Bowl(int pins)
    {
        if (pins < 0 || pins > 10)
            throw new UnityException("Invalid pin count");
        bowls[bowl - 1] = pins;     //assigns the pins knocked for each bowl
        //other cases will be added here
        if (bowl == 21)        //end gme at bowl 21
        {
            return Action.EndGame;
        }
        if(bowl>=19 && Bowl21Awarded())     //last frame special cases
        {
            bowl++;
            if (((bowls[20 - 1] + bowls[19-1])%10)==0)
            {
                return Action.Reset;
            }
                 return Action.Tidy;
        }
        else if (bowl == 20 && !Bowl21Awarded())
        {
            return Action.EndGame;
        }

        if (pins == 10)    //ends turn at strike
        {
            bowl += 2;
            return Action.EndTurn;
        }

        if (bowl % 2 != 0) //if we are in middle frame
        {
            bowl++;
            return Action.Tidy;
        }
        else if(bowl % 2 == 0) //if we are in end of frame
        {
            bowl++;
            return Action.EndTurn;
        }
        if (pins == 0)
        {
            bowl++;
            return Action.EndTurn;
        }
        //other cases will be added here

        throw new UnityException("Cant decide what action to perform");
    }
    public bool Bowl21Awarded()     //bowl 21 awarded only if sum of pins knocked down in bowls 19 and 20 >10
    {
        return (bowls[19 - 1] + bowls[20 - 1] >= 10);     //array index starts at 0
    }
}