"""
  MasterMind Game
  Author: Peter Casey
  Version: 0.01
  Play the MasterMind......
"""

def welcome():
    """
        Welcome the user, describe this
        is a MasterMind game
        Input: nothing
        Return: nothing
    """
    print("Welcome to MasterMind")

def create_puzzle():
    """
        Create a puzzle for the user to guess
        Input: nothing
        Return: the puzzle (four color pegs)
    """
    print("create a puzzle")

def get_user_guess():
    """
        Ask the user for their guess for one turn
        Input: nothing
        Return the user guess (four colors in order)
    """
    print("get the users guess")

def evaluate_user_guess(users_guess, puzzle):
    """
        Evalute the users guess against the puzzle
        Input: the users guess, the puzzle
        Return: the Black and White pegs based on evaluation
    """
    print("Evaluate user's guess")
    return "BW"

def show_guess_results(results):
    """
        Show player the result of their guess (on screen)
        Input: evaluation of user guess
        Return: nothing
    """
    print("Your guess results are:", results)

def show_rules():
    """
        Display basic game rules and game play
    """
    print("Guess four pins from red, green, blue, and purple")
    print("List them in the order you wish")
    print("Enter the pins with R, G, B, or P")
    print("An Example: GRPB <press enter>")

def play_one_round():
    """
        Play one round with a single puzzle
        Unlimited guesses until correct
    """
    puzzle = create_puzzle()
    correct_answer = False

    while correct_answer == False:   # not correct_answer
        users_guess = get_user_guess()
        results = evaluate_user_guess(users_guess, puzzle)
        show_guess_results(results)
        correct_answer = (results == "BBBB")


def game_loop():
    """
        Do the welcome, ask if interested in game play
           if so, play game, ask to go again
    """
    welcome()
    show_rules()
    wants_to_play = input("Want to play? (y/n) ")

    while wants_to_play in ['y', 'Y', 'Yes', 'yes']:
        play_one_round()
        wants_to_play = input("Want to play again? (y/n) ")

game_loop()