// A game of (European) roulette.
//
// Notice the usage of the && and || operators, the tracking of the maximum bank,
//   the mixed String/numerical input, and the usage of random numbers.
// In particular, notice that only one Random object is created, and it is passed
//   as a parameter.
import java.util.*;

public class Roulette {
   public static void main(String[] args) {
      Scanner console = new Scanner(System.in);
      Random rand = new Random();
      
      int bank = 100;
      int max = bank;
      int spins = 0;
   
      System.out.println("Let's play roulette!");
      
      while (bank > 0) {
         int bet = getBet(console, bank);
         String choice = getChoice(console);

         boolean result = spinWheel(rand, choice);
         if (result) {
            bank += bet;
         } else {
            bank -= bet;
         }
         spins++;
         max = Math.max(max, bank);
      }
      
      System.out.println("You played " + spins + " times and could have had $" + max);
   }
   
   // Ask for and return the user's bet, limiting the bet at the user's current bankroll.
   //
   // Scanner console - the Scanner to use for input
   // int bank - the amount of money the user currently has
   public static int getBet(Scanner console, int bank) {
      System.out.print("You currently have $" + bank + ". Your bet? $");
      int bet = console.nextInt();
      if (bet > bank) {
         System.out.println("You don't have that much. Betting $" + bank + " instead.");
         bet = bank;
      }   
      return bet;
   }
   
   // Ask whether the user will bet on high or low and return the answer, 
   //   rejecting all other responses.
   // 
   // Scanner console - the Scanner to use for input
   public static String getChoice(Scanner console) {
      System.out.print("Bet on high or low? ");
      String choice = console.next();
      while (!choice.equalsIgnoreCase("high") && !choice.equalsIgnoreCase("low")) {
         System.out.print("Invalid bet. High or low?");
         choice = console.next();
      }
      return choice;
   }
   
   // Simulate a single spin of the roulette wheel and return whether or not
   //   the player won their bet.
   //
   // Random r - the Random object to use
   // String bet - whether the player bet on high or low
   public static boolean spinWheel(Random r, String bet) {
      int spin = r.nextInt(37);
      System.out.print("Spin was: " + spin + ". ");
      
      if ((bet.equals("high")&& spin > 18) ||
          (bet.equals("low") && spin <= 18 && spin != 0)) {
         System.out.println("You won!!!!");
         return true;
      } else {
         System.out.println("You lost.");
         return false;
      }
   }
}