import java.util.Scanner;

/**
 *
 * @author
 * Section 2
 */
public class RockPaperScissors{

    //these are class constants (all methods in the class can see them)
    static final int ROCK = 1, PAPER = 2, SCISSORS = 3, YOU_WIN = 4, COMP_WIN = 5, DRAW = 0;

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String userInput;
        int yourScore=0, compScore=0;
        int gameResult;

        System.out.println("========================");
        System.out.println("ROCK PAPER SCISSORS GAME");
        System.out.println("========================");
        System.out.println("\nHello! Let's get started!");

        do {
            //calling the playGame method
            gameResult = playGame(scan);

            if (gameResult == YOU_WIN)
                yourScore++;
            else if(gameResult == COMP_WIN)
                compScore++;

            printScore(yourScore,compScore);
            System.out.println("       You : Comp");
            System.out.println("Score: -----------");
            System.out.println("        | "+yourScore+" : "+compScore+" |");
            System.out.print("Do you want to play some more? (y or n): ");
            userInput = scan.next();

        } while (userInput.equalsIgnoreCase("y") || userInput.equalsIgnoreCase("yes"));

        System.out.println("========GAME OVER=======");
        System.out.println("       FINAL SCORE:");
        printScore(yourScore,compScore);
    }


    /**
    This method "plays" the game.
    The input parameter is the Scanner object created in main()
    The method return the int result of the game.
    */
    private static int playGame(Scanner scan) {
        int yourChoice, compChoice;
        //1. Prompt the user and use scan to read her input (R, P, or S)
        System.out.println("Rock, Paper, or Scissors? (R,P,S):");
        String usermove = scan.nextLine();

        //2. Use a while loop to continue asking for user input if it is not
        // one of the three above ("r", "p", or "s", ignoring case)
        while(!usermove.equalsIgnoreCase("r") ||  !usermove.equalsIgnoreCase("p") || !usermove.equalsIgnoreCase("s"));
            System.out.println(usermove+" Is not suported. Try again");
            usermove = scan.nextLine();

        //3. Once the user input is satisfactory
        //print out the choice (e.g. "You chose Rock!"),
        //translate it to one of the int constants (ROCK, PAPER, or SCISSORS),
        //and assign to yourChoice variable (e.g. yourChoice = ROCK)
        if(usermove.equalsIgnoreCase("R")){
            System.out.println("You chose Rock!");
            yourChoice= ROCK;
        }
        else if (usermove.equalsIgnoreCase("P")){
            System.out.println("You chose Paper!");
            yourChoice= PAPER;
        }
        else if (usermove.equalsIgnoreCase("S")){
            System.out.println("You chose Scissors!");
            yourChoice= SCISSORS;
        }

        //4. Use Math.random() to randomly generate computer's choice
        //Remember, you need to split the range between 0 and 1 into
        // three equal intervals and if the random number is in one of them
        // assign a corresponding constant to compChoice.
        //Print out computer's choice as well.
        double x= Math.random();
        if (x<.33){
            System.out.println("Computer Chose Rock!");
            compChoice= ROCK;
        }
        else if (x>.66){
            System.out.println("Computer Chose Paper!");
            compChoice= PAPER;
        }
        else{
            System.out.println("Computer Chose Scissors!");
            compChoice= SCISSORS;
        }
        //Call the method whoWins using yourChoice and compChoice as parameters-----------
        int gameResult = whoWins(result);

        //return the game result to main()------------------------------------------------
        return gameResult;
    }


    /**
    This method takes two int parameters yourChoice and compChoice,
    and returns the result of the game.

    It will return YOU_WIN if you win, COMP_WIN if computer wins
    and DRAW if it is a draw. (Remember, these are constants defined in this class)

    In addition, the method prints out the corresponding description of
    the result of the game e.g. "It's a draw!!",
    or "Scissors cut Paper! You WIN!".
    or "Rock is covered by Paper! You lose :(", and so on.
    */
    private static int whoWins(int yourChoice, int compChoice){
        int result;
        if(yourChoice==ROCK && compChoice==SCISSORS){
            System.out.println("Rock smashes Scissors! You WIN!");
            result= YOU_WIN;
        }
        else if(yourChoice==ROCK && compChoice==PAPER){
            System.out.println("Paper wraps Rock! You LOSE!");
            result= COMP_WIN;
        }
        else if(yourChoice==ROCK && compChoice==ROCK){
            System.out.println("Rock hits Rock! It's a DRAW!");
            result= DRAW;
        }
        if(yourChoice==PAPER && compChoice==SCISSORS){
            System.out.println("Scissors gets cut! You LOSE!");
            result= COMP_WIN;
        }
        else if(yourChoice==PAPER && compChoice==PAPER){
            System.out.println("Both Papers fold! It's a DRAW!");
            result= DRAW;
        }
        else if (yourChoice==PAPER && compChoice==ROCK){
            System.out.println("Paper wraps Rock! You LOSE!");
            result= YOU_WIN;
        }

        if(yourChoice==SCISSORS && compChoice==SCISSORS){
            System.out.println("Both SCissors fold! It's a DRAW!");
            result= DRAW;
        }
        else if(yourChoice==SCISSORS && compChoice==PAPER){
            System.out.println("Scissors cuts Paper! You WIN!");
            result= YOU_WIN;
        }
        else if(yourChoice==SCISSORS && compChoice==ROCK){
            System.out.println("Rock smashes Scissors! You LOSE!");
            result= COMP_WIN;
        }
        return result;
    }

    /**
    This method takes in yourScore and compScore as parameters and prints
    them out in a formatted way, as shown in the project description.
    */
    private static void printScore(int yourScore, int compScore){
        System.out.println("       You : Comp");
        System.out.println("Score: -----------");
        System.out.println("        | "+yourScore+" : "+compScore+" |");
        return;
    }

}