ActionMaster Script

using UnityEngine;
using System.Collections;

public class ActionMaster {

	public enum Action { Tidy, Reset, EndTurn, EndGame } ;
	public int[] bowls = new int[21] ;
	public int bowl = 1 ;


	public Action Bowl (int pins) {
		if (pins < 0 || pins > 10) {throw new UnityException ("Invalid Pins !");}


		if (bowl == 21) {

			return Action.EndGame ;
		}


		bowls [ bowl -1] = pins ;


		if (bowl == 19 && Bowl21StrikeAt19()) { 	//
													// if scored  a strike in bowl 19 reset
				bowl +=1 ;
				return Action.Reset ;
		}

		if (bowl == 20 && Bowl21StrikeAt19()) {  	// T11PaulRequireResetAt20()
			if (Bowl21StrikeAt20()) {  				// if a strike was scored in bowl 19
				bowl +=1 ;							// And another strike was scored in 20 do a reset
				return Action.Reset ;
			}
		}

		if (bowl == 19 && Bowl21StrikeAt19() ) {   	// T09DarylRequireTidyAt20()
			if (!Bowl21StrikeAt20()) { 				// if a strike was scored in bowl 19
				bowl +=1 ;							// and 0-9 was scored in bowl 20 do a tidy
				return Action.Tidy  ;

			}
		}

		if (bowl == 20 && Bowl21StrikeAt19()) {
			bowl +=1 ;							    // if its bowl 20 and a strike was scored
			return Action.Tidy  ;					// in bowl 19 do a tidy

		}


		if (bowl == 20 && Bowl21SpareAt20()) { 		// T05CheckResetAtSpareInLastFrame()
													// play one more ball
			bowl +=1 ;								//  because of spare with final ball
			return Action.Reset  ;
		}

		if (bowl == 20 && ( !Bowl21StrikeAt19()
		                  ||!Bowl21StrikeAt20()
		                  ||!Bowl21SpareAt20 () )) {//T08GameEndsAtBowl20()
													//at bowl 20 if no ball awarded endgame
			bowl += 1 ;
			return Action.EndGame ;
			}


		if (bowl %2 != 0) {   						//first bowl of frame , uses Mod (remainder)
			if (pins == 10) {
				bowl += 2 ;
				return Action.EndTurn ;
			}else {									// second bowl of frame
				bowl += 1 ;
				return Action.Tidy ;
			}

		} else if (bowl % 2 == 0) {  				//end of frame
			bowl += 1 ;
			return Action.EndTurn ;
		}


		throw new UnityException ("Not sure what action to return!") ;
	}

	private bool Bowl21StrikeAt20() {
	// arrays start counting at 0
		return ( bowls [20-1] >= 10) ;

	}

	private bool Bowl21SpareAt20() {
		// arrays start counting at 0
		return ( bowls [19-1] + bowls [20-1] >= 10) ;

	}
	private bool Bowl21StrikeAt19() {
		// arrays start counting at 0
		return (bowls [19-1]  >= 10) ;



	}

}