import random
#   The standard module random is used for getting
#   a random element from the jumble word list.

JUMBLE_FILE_NAME = 'jumble_words.txt'

def read_jumble_words(filename = JUMBLE_FILE_NAME):
    """Read Jumber words file and return a list of the words.."""
    with open(filename, 'r') as file:
        return [line.rstrip() for line in file]
    
def jumble_word(word):
    """Shuffles the letters of a given word and return a list of the letters"""
    return random.sample(word, len(word))


def get_word_from_user(prompt):
    """
    Prompts the user to enter a word and returns it.
    Includes validation to ensure only a single word is entered.
    """
    while True:
        user_input = input(prompt).strip().lower()

        if user_input.isalpha():
            return user_input
        else:
            print("Invalid input. Please enter a word with only alphabets.")
 
def get_yes_no_answer(prompt):
    """ 
        Prompt the user to enter a yes no answer.
        Return True if yes, False if no.
    """
    while True:
        user_input = input(prompt).strip().lower()
        if user_input in ('y', 'yes'):
            return True
        elif user_input in ('n', 'no'):
            return False
        else:
            print("Invalid input. Please enter 'yes' or 'no'.")
            
def play_one_game(word):
    """play one Jumble game."""
  
    # [1] Get a list of shuffled letters from the jumble word.   
    jumbled_letters = jumble_word(word)
  
    # Show the shuffled lettes.
    print(f"Jumbled letters: {", ".join(jumbled_letters)}")
    
    # 2. Get user input, converted to lower cases.
    user_guess = input("Your guess: ").lower()
    
    # 3. Check the guess and provide the result.
    if user_guess == word:
        print("Congratulations! You guessed the correct word.")
    else:
        print(f"Sorry, incorrect guess. The correct answer is: {word}")

def main():
    #   Play games as many times as the user like.
    
    #   Read the jumble word file into the list words.
    words = read_jumble_words()
    
    #   Print welcome message.
    print(f"Welcome to the Jumble Word Game!")
    print(f"Unscramble the following letters to form a valid word:")
    print("-" * 54)
    while True:
        #   Get a random word.
        word = random.choice(words)
        
        #   Play one jumble game.
        play_one_game(word)
        if not get_yes_no_answer('\nPlayer another game [y/n]:  '):
            break;
            
    #   print bye message.
    print("\nBye, see you later.")   
if __name__ == "__main__":
    main()