import pickle
from pathlib import Path


CMU_DICT_PATH = Path(__file__).parent / "cmudict.rep"
CACHE_PATH = Path(__file__).parent / "cmudict_cache.pickle"


def get_dict() -> dict[str, list[list[str]]]:
    if CACHE_PATH.exists():
        with open(CACHE_PATH, "rb") as pickle_file:
            g2p_dict = pickle.load(pickle_file)
    else:
        g2p_dict = read_dict()
        cache_dict(g2p_dict, CACHE_PATH)

    return g2p_dict


def read_dict() -> dict[str, list[list[str]]]:
    g2p_dict = {}
    start_line = 49
    with open(CMU_DICT_PATH, encoding="utf-8") as f:
        line = f.readline()
        line_index = 1
        while line:
            if line_index >= start_line:
                line = line.strip()
                word_split = line.split("  ")
                word = word_split[0]

                syllable_split = word_split[1].split(" - ")
                g2p_dict[word] = []
                for syllable in syllable_split:
                    phone_split = syllable.split(" ")
                    g2p_dict[word].append(phone_split)

            line_index = line_index + 1
            line = f.readline()

    return g2p_dict


def cache_dict(g2p_dict: dict[str, list[list[str]]], file_path: Path) -> None:
    with open(file_path, "wb") as pickle_file:
        pickle.dump(g2p_dict, pickle_file)