import re

from linkki_poster.models import LANGUAGE_DISPLAY_NAMES, LanguageAssets


def prompt_language_order(languages: list[LanguageAssets], input_fn=input) -> list[LanguageAssets]:
    if len(languages) <= 1:
        return languages

    print("Language order:")
    for index, language_assets in enumerate(languages, start=1):
        print(f"{index}. {LANGUAGE_DISPLAY_NAMES[language_assets.language]}")

    expected = list(range(1, len(languages) + 1))
    while True:
        raw = input_fn("Enter language order: ")
        if raw.strip() == "":
            return languages
        parsed = parse_order_input(raw, len(languages))
        if parsed is None:
            print(f"Invalid order. Press Enter for default order {expected}, or enter digits {expected}.")
            continue
        return [languages[index - 1] for index in parsed]


def parse_order_input(raw_text: str, language_count: int) -> list[int] | None:
    digits = [int(item) for item in re.findall(r"\d", raw_text)]
    if len(digits) != language_count:
        return None

    expected = set(range(1, language_count + 1))
    if set(digits) != expected:
        return None

    return digits