#!/usr/bin/python

WORDLE_LENGTH = 5

_invalid_words = set(
    [
        "amala",
        "arara",
        "araru",
        "araua",
        "arawa",
        "balak",
        "batak",
        "bayal",
        "beala",
        "beata",
        "beele",
        "boily",
        "bolty",
        "bruke",
        "carlo",
        "caroa",
        "carot",
        "carum",
        "divet",
        "doray",
        "erept",
        "fikie",
        "genae",
        "ghole",
        "gotra",
        "hirse",
        "hyrse",
        "katat",
        "korah",
        "macco",
        "mitra",
        "muang",
        "nurry",
        "odell",
        "odell",
        "petro",
        "pindy",
        "quito",
        "retan",
        "roter",
        "sisel",
        "skeel",
        "staia",
        "stail",
        "sussy",
        "tebet",
        "telae",
        "theet",
        "undig",
        "uninn",
        "unkin",
        "vedet",
        "whalm",
        "whaly",
    ]
)


_wordle_dictionary = set()


def words():
    if not _wordle_dictionary:
        with open("words_alpha.txt") as word_file:
            all_words = word_file.read().split()
        _wordle_dictionary.update(
            filter(
                lambda w: len(w) == WORDLE_LENGTH and w not in _invalid_words, all_words
            )
        )

    return _wordle_dictionary