Snake Eyes

/*

@startuml
class SnakeEyes {
    - MAX_ROLLS: int
    - playAgain: boolean
    + main(args: String[]): void
}

class Die {
    - MAX: int
    - faceValue: int
    + Die()
    + roll(): int
    + getFaceValue(): int
    + setFaceValue(value: int): void
    + toString(): String
}

class Scanner {
    + nextLine(): String
    + nextInt(): int
    + close(): void
}

class Random {
    + nextInt(bound: int): int
}

' Dependencies
SnakeEyes ..> Scanner : uses
SnakeEyes ..> Random : uses
SnakeEyes --> Die : creates
Die ..> Random : uses
@enduml


*/


import java.util.Random;
import java.util.Scanner;

public class SnakeEyes {
    private static final int MAX_ROLLS = 500;

    public static void main(String[] args) {
        boolean playAgain = true;

        System.out.println("🎲 Welcome to the Snake Eyes Game! 🎲");
        System.out.println("Try to roll two ones! You have a total of " + MAX_ROLLS + " rolls.");
        System.out.println("Enter a number of rolls (or type 'bye' to exit).");

        try (Scanner scan = new Scanner(System.in)) { 
            while (playAgain) {
                int remainingRolls = MAX_ROLLS;
                int snakeEyesCount = 0;

                while (remainingRolls > 0) {
                    System.out.print("\nEnter number of rolls (remaining: " + remainingRolls + "): ");
                    String input = scan.nextLine().trim();

                    if (input.equalsIgnoreCase("bye")) {
                        System.out.println("👋 Thanks for playing! See you next time.");
                        return;
                    }

                    int rolls;
                    try {
                        rolls = Integer.parseInt(input);
                        if (rolls <= 0) {
                            System.out.println("❌ Please enter a positive number.");
                            continue;
                        }
                        if (rolls > remainingRolls) {
                            System.out.println("⚠️ You only have " + remainingRolls + " rolls left!");
                            continue;
                        }
                    } catch (NumberFormatException e) {
                        System.out.println("❌ Invalid input. Please enter a valid number or 'bye' to exit.");
                        continue;
                    }

                    Die die1 = new Die();
                    Die die2 = new Die();

                    int num1, num2;
                    for (int i = 0; i < rolls; i++) {
                        num1 = die1.roll();
                        num2 = die2.roll();
                        if (num1 == 1 && num2 == 1) {
                            snakeEyesCount++;
                        }
                    }

                    remainingRolls -= rolls;

                    System.out.println("🎲 You rolled " + rolls + " times.");
                    System.out.println("🐍 Snake Eyes count: " + snakeEyesCount);
                    System.out.println("📊 Hit rate: " + String.format("%.4f", (float) snakeEyesCount / (MAX_ROLLS - remainingRolls)));

                    if (remainingRolls == 0) {
                        System.out.println("\nGame over! 🎉");
                        System.out.println("Total Snake Eyes: " + snakeEyesCount);
                        System.out.println("Final Hit Rate: " + String.format("%.4f", (float) snakeEyesCount / MAX_ROLLS));

                        while (true) {
                            System.out.print("\nPlay again? (y/n): ");
                            String response = scan.nextLine().trim().toLowerCase();

                            // ✅ Updated: Use Java 14+ switch expression
                            switch (response) {
                                case "y" -> {
                                    remainingRolls = MAX_ROLLS;
                                    snakeEyesCount = 0;
                                }
                                case "n" -> {
                                    System.out.println("👋 Thanks for playing! Goodbye!");
                                    playAgain = false;
                                }
                                default -> System.out.println("❌ Invalid input. Please enter 'y' or 'n'.");
                            }
                            if (!playAgain || remainingRolls == MAX_ROLLS) {
                                break;
                            }
                        }
                    }
                }
            }
        }
    }
}

// Die class representing a six-sided die
class Die {
    private static final int MAX = 6;
    private int faceValue;

    public Die() {
        faceValue = 1;
    }

    public int roll() {
        Random generator = new Random();
        faceValue = generator.nextInt(MAX) + 1;
        return faceValue;
    }

    public int getFaceValue() {
        return faceValue;
    }

    public void setFaceValue(int value) {
        if (value >= 1 && value <= MAX) {
            faceValue = value;
        }
    }

    @Override // 
    public String toString() {
        return "Die: " + faceValue;
    }
}