package exercises.ch6Methods;

import java.security.SecureRandom;
import java.util.Scanner;

/**
 * 
 * 6.33 (Craps Game Modification) Modify the craps program of Fig. 6.8 to allow wagering. 
 * Initialize variable bankBalance to 1000 dollars. Prompt the player to enter a wager. 
 * Check that wager is less than or equal to bankBalance, and if it’s not, 
 * have the user reenter wager until a valid wager is entered. Then, run one game of craps. 
 * If the player wins, increase bankBalance by wager and display the new bankBalance. 
 * If the player loses, decrease bankBalance by wager, display the new bank- Balance, 
 * check whether bankBalance has become zero and, if so, display the message "Sorry. You busted!" 
 * As the game progresses, display various messages to create some “chatter,” such as 
 * "Oh, you're going for broke, huh?" or "Aw c'mon, take a chance!" or "You're up big. 
 * Now's the time to cash in your chips!". Implement the “chatter” as a separate method that 
 * randomly chooses the string to display.
 *
 */

	public class CrapsWithWager 
	{
	// create secure random number generator for use in method rollDice
	private static final SecureRandom randomNumbers = new SecureRandom();

	// enum type with constants that represent the game status
	private enum Status {CONTINUE, WON, LOST};
	

	// constants that represent common rolls of the dice
	private static final int SNAKE_EYES = 2;
	private static final int TREY = 3;
	private static final int SEVEN = 7;
	private static final int YO_LEVEN = 11;
	private static final int BOX_CARS = 12;
	

	// plays one game of craps
	public static void main(String[] args)
	{
	   int myPoint = 0; // point if no win or loss on first roll
	   Status gameStatus; // can contain CONTINUE, WON or LOST
	   int playFlag;
	   int bankBalance = 1000;
	   int wager = 0;
	   
	   Scanner input =new Scanner(System.in);
		
		do {
			System.out.print("拋雙骰兒遊戲，請按1開始遊戲（輸入-1退出遊戲)：");
			playFlag = input.nextInt();
			if(playFlag ==-1)
				{System.out.print("已退出程式");
				    break;
			    }
			//在此插入一句隨機生成的聊天資訊，增強遊戲氣氛
			chat();
			System.out.printf("你當前的餘額為%d，請輸入下注金額（整數，輸入-1退出遊戲）：", bankBalance);
			wager = input.nextInt();
			while(wager <0 || wager > bankBalance)
				{System.out.print("請輸入有效的下注金額：");
				wager = input.nextInt();
			    }
			
	   int sumOfDice = rollDice(); // first roll of the dice

	   // determine game status and point based on first roll 
	   switch (sumOfDice) 
	   {
	      case SEVEN: // win with 7 on first roll
	      case YO_LEVEN: // win with 11 on first roll           
	         gameStatus = Status.WON;
	         bankBalance += wager;
	         break;
	      case SNAKE_EYES: // lose with 2 on first roll
	      case TREY: // lose with 3 on first roll
	      case BOX_CARS: // lose with 12 on first roll
	         gameStatus = Status.LOST;
	         if (bankBalance - wager >= 0)
	             bankBalance -= wager;
	         else
	        	 bankBalance = 0;
	         break;
	      default: // did not win or lose, so remember point         
	         gameStatus = Status.CONTINUE; // game is not over
	         myPoint = sumOfDice; // remember the point
	         System.out.printf("哦，平手！點數為： %d%n", myPoint);
	         break;
	   } 

	   // while game is not complete
	   while (gameStatus == Status.CONTINUE) // not WON or LOST
	   { 
	      sumOfDice = rollDice(); // roll dice again

	      // determine game status
	      if (sumOfDice == myPoint) // win by making point
	         {gameStatus = Status.WON;
	         bankBalance += wager;
	         }
	      else 
	      {
	         if (sumOfDice == SEVEN) // lose by rolling 7 before point
	         {
	            gameStatus = Status.LOST;
	         if (bankBalance - wager >= 0)
	             bankBalance -= wager;
	         else
	        	 bankBalance = 0;
	         }
	      }
	   } 

	   // display won or lost message
	   if (gameStatus == Status.WON)
	      System.out.printf("恭喜你，你贏了！你當前賬戶餘額為：%d%n", bankBalance);
	      
	   else
		   System.out.printf("哦哦，你輸了！你當前賬戶餘額為：%d%n", bankBalance);
	   
	   if (bankBalance == 0)
		   System.out.printf("%n很遺憾，你已輸光了！努力工作，賺錢後再來吧！");
	   
	   System.out.println();  //輸入空行，開始下一局遊戲
	}while (playFlag != -1 && bankBalance >0);   //餘額為0時，自動退出遊戲
		
		input.close();	
	}

	// roll dice, calculate sum and display results
	public static int rollDice()
	{
	   // pick random die values
	   int die1 = 1 + randomNumbers.nextInt(6); // first die roll
	   int die2 = 1 + randomNumbers.nextInt(6); // second die roll

	   int sum = die1 + die2; // sum of die values

	   // display results of this roll
	   System.out.printf("你丟擲的點數為： %d + %d = %d%n", 
	      die1, die2, sum);

	   return sum; 
	}
	
	// 輸出隨機聊天資訊
	public static void chat()
	{
	   int msgNum = 1 + randomNumbers.nextInt(4); // 生成隨機訊息編號
	   
		//表示隨機聊天資訊的常數
		final String MSG1 = "不要小看拋雙骰兒，這裡面有大學問！";
		final String MSG2 = "今天點子有點兒背？積德行善會轉運哦！";
		final String MSG3 = "小賭怡情，大賭傷身哦！";
		final String MSG4 = "運氣是什麼，賬戶餘額翻倍靠的就是運氣！";

		
       //提示下注
			switch (msgNum){
			case 1:
				System.out.println(MSG1);
				break;
			case 2:
				System.out.println(MSG2);
				break;
			case 3:
				System.out.println(MSG3);
				break;
			case 4:
				System.out.println(MSG4);
				break;	
			
			}

	}
	
	} // end class Craps
 

執行結果：