/* The game of craps is a gambling game that works as follows.  Make a bet (we have to make sure you don't bet an
 * illegal amount such as a negative number or more than you have).  Roll 2 6-sided dice.  If you roll a 7 or 11, you
 * win.  If you roll 2, 3 or 12 (called Craps), you lose.  Otherwise your roll is your mark.  Roll until either you roll
 * your mark (you win) or a 7 (you lose).  Output the results and let the user play again.  Write this game using methods. */
 
 import java.util.*;			// Scanner and Random
 
 public class Craps
 {
 	public static void main(String[] args)
 	{
 		int amount = 200;							// user's initial amount to gamble
 		Scanner in = new Scanner(System.in);		// needed to input user's next bet
 		Random g = new Random();					// g is our Random number generator
 		int bet;
 		int die1, die2, roll, mark, win;			// win is used to store whether you won this particular round or lost
		bet = getBet(amount, in);					// input the bet and data verify its not < 0 or > amount
 		while(bet>0) {								// play while they want to continue to bet
			 die1 = rollDie(g);						// roll both die and store sum in roll
			 die2 = rollDie(g);
			 roll = die1 + die2;
			 output(die1, die2, roll);				// output result of roll
			 win = didYouWin(roll, 0, 1);			// didYouWin returns 1 if you won, -1 if you lost, 0 if neither
			 while(win!=1&&win!=-1) 				// if you didn't win or lose, roll is your mark, continue
			 {										//    until you win or lose (get mark or 7)
			 	 mark = roll;						// remember your first roll
			 	 die1 = rollDie(g);
				 die2 = rollDie(g);
				 roll = die1 + die2;
				 output(die1, die2, roll);				// output result of roll
				 win = didYouWin(roll, mark, 2);		// test for win (did you roll a mark or 7?)
			 }
			 amount = updateAmount(win, bet, amount);	// update amount based on your bet and whether you won or lost
			 if(amount>0) bet = getBet(amount, in);		// if you still have money to gamble, get next bet
			 else 										// but if amount is 0, you have to leave
			 {			
				System.out.println("You lost all your money, sorry but you can't play any more");
				bet = 0;
			 }
 		}
 		outputResult(amount);						// output result
 	}
 	
 	// get user's bet between 0 (quit) or 1..amount (legal bet) and data verify - don't let user enter a negative or a value > amount
 	public static int getBet(int amount, Scanner in)
 	{
 		int bet;
 		do{
	 		System.out.print("How much do you want to bet?  It can't be more than " + amount + " or less than 1.  Enter 0 to exit  ");
 				bet = in.nextInt();	
		}while(bet<0||bet>amount); 		
		return bet;
 	}
 	
 	// output result of the current roll
 	public static void output(int d1, int d2, int roll)
 	{
		System.out.println("Your roll is " + d1 + " and " + d2 + " for a total of " + roll);
 	}
 	
 	// generate a random 6-sided die roll using the Random number generator
 	public static int rollDie(Random r)
 	{
 		return r.nextInt(6)+1;
 	}
 	
 	// if first roll, did the user win (7/11) then return 1 or lose (2/3/12) then return -1 otherwise return 0 to indicate 
 	//   neither a winning or losing roll
 	// if not first roll, did the user win (roll==mark) then return 1 or lose (roll==7) then -1 else 0 to continue
 	public static int didYouWin(int roll, int mark, int turn)
 	{
 		if(turn==1)				// first turn, check, for 7/11 for a winning first roll
 			if(roll==7||roll==11)
 			{
 				System.out.println("First roll winner!");
 				return 1;
 			}
 			else if(roll==2||roll==3||roll==12)	// or craps for a losing first roll
 			{
 				System.out.println("Craps");
 				return -1;
 			}
 			else return 0;			// otherwise if first roll then continue playing, roll becomes the mark
 		else				// else not first roll
 			if(roll==mark)			// was the new roll the mark? if so user wins
 			{
 				System.out.println("You hit your mark!");
 				return 1;
 			}
 			else if(roll==7)		// else if new roll was 7, user loses
 			{
 				System.out.println("Bummer, a 7");
 				return -1;
 			}				
 			else return 0;			// otherwise new roll was neither mark nor 7, continue rolling
 	}
 	
 	public static int updateAmount(int win, int bet, int amount)	// based on bet and win/loss, update amount
 	{
 		 if(win==1)
		 {
		 	amount+=bet;
		 	System.out.println("You won $" + bet + " and now have $" + amount);
		 }
		 else
		 {
		 	amount-=bet;
		 	System.out.println("You lost $" + bet + " and now have $" + amount);
		 }
		 return amount;
 	}
 	
 	public static void outputResult(int amount)		// output the results of the game
 	{ 		
 		if(amount>200) System.out.println("You have $" + amount + " so you won $" + (amount - 200));
 		else if(amount==200) System.out.println("You broke even, thanks for playing");
 		else if(amount>0) System.out.println("You lost money, sorry, but you still walk away with $" + amount);
 		else System.out.println("Wow, you lost it all, maybe you shouldn't gamble!");
 	}
 }