import random
import os
import sys

words = [
    'dog',
    'cat',
    'tiger',
    'wolf',
    'rhino',
    'eagle',
    'ladybug',
    'tucan',
    'alien',
    'dinosaur',
    'shark'
]

def clear():
    if os.name == 'nt':
        os.system('cls')
    else:
        os.system('clear')

def draw(bad_guesses, good_guesses, secret_word):
    clear()

    print('')
    print('Strikes: {}/7'.format(len(bad_guesses)))

    for letter in bad_guesses:
        print(letter, end=' ')
    print('\n\n')

    for letter in secret_word:
        if letter in good_guesses:
            print(letter, end='')
        else:
            print('_', end='')

    print('')


def get_guess(bad_guesses, good_guesses):
    while True:
        guess = input("Guess a letter: ").lower()

        if len(guess) != 1:
            print("One letter at a time, please :)")
        elif guess in bad_guesses or guess in good_guesses:
            print("You've already guessed that one :l")
        elif not guess.isalpha():
            print("Only letters, please :]")    
        else:
            return guess


def play(done):
    clear()
    secret_word = random.choice(words)
    bad_guesses = []
    good_guesses = []

    while True:
        draw(bad_guesses, good_guesses, secret_word)
        guess = get_guess(bad_guesses, good_guesses)

        if guess in secret_word:
            good_guesses.append(guess)
            found = True
            for letter in secret_word:
                if letter not in good_guesses:
                    found = False
            if found:
                print("You win!")
                print("The secret word was {}".format(secret_word))
                done = True
        else:
            bad_guesses.append(guess)
            if len(bad_guesses) == 7:
                draw(bad_guesses, good_guesses, secret_word)
                print("You lost!")
                print("The secret word was {}".format(secret_word))
                done = True

    if done:
        play_again = input("Play again? Y/n ").lower()
        if play_again != 'n':
            return play(done=False)
        else:
            sys.exit()

def welcome():
    start = input("Press enter/return to start or Q to quit ").lower()
    if start == 'q':
        print("See ya!")
        sys.exit()
    else:
        return True

print('Welcome to Letter Guess!')

done = False

while True:
    clear()
    welcome()
    play(done)