def belongs_to_dictionary(word):
    """check if a word is in dictionary
    :word: the word to check
    :returns: true if in word.txt else false
    """
    with open("words.txt") as wl:
        word_list = wl.read().split()
        return word in word_list


def ask_word_in_dictionary():
    """ ask a word, if not in word.txt redo
    :returns: word of word.txt
    """
    while(True):
        in_word = input("insert a word that belongs to the file words.txt: ")
        if belongs_to_dictionary(in_word):
            return in_word
        print(f"{in_word} is not in word.txt")


def ask_letter(tried_letters):
    """ ask for a letter and check if it is not in trie_letters else redo
    :tried_letters: list of already tried letters
    :returns: the letter that is not in tried letters
    """
    while(True):
        in_letter = input(f"insert a letter that is not tested yet: {tried_letters.split()}: ")
        if in_letter not in tried_letters:
            return in_letter
        print(f"{in_letter} is already guessed")


if __name__ == "__main__":  # Only tests
    print("Test de la fonction, belongs_to_dictionary")
    testing_words = {'banana': True,
                     'patatas': False,
                     'tonitch': False,
                     'other': True,
                     'lol': False,
                     1: False,
                     False: False}
    for value, result in testing_words.items():
        if belongs_to_dictionary(value) == result:
            print(f"{value} has been tested, returned {result} -- SUCCESS!")
        else:
            print(f"{value} has been tested, returned {result} -- ERROR!")

    print("Test de la fonction, ask_word_in_dictionary")
    value = ask_word_in_dictionary()
    print(f"The function returned value {value}")

    print("Test de la fonction, ask_letter")
    value = ask_letter("")
    print(f"The function returned value {value}")
    value = ask_letter("aeiou")
    print(f"The function returned value {value}")
    print("Test are finished")