import re


def strip_markdown_for_twitch(markdown: str) -> str:
    text = markdown
    text = re.sub(r"!\[[^\]]*\]\([^)]+\)", "", text)
    text = re.sub(r"\[([^\]]+)\]\([^)]+\)", r"\1", text)
    text = re.sub(r"\*\*([^*]+)\*\*", r"\1", text)
    text = re.sub(r"__([^_]+)__", r"\1", text)
    text = re.sub(r"(?<!\*)\*([^*]+)\*(?!\*)", r"\1", text)
    text = re.sub(r"(?<!_)_([^_]+)_(?!_)", r"\1", text)
    text = re.sub(r"~~([^~]+)~~", r"\1", text)
    text = re.sub(r"```[\s\S]*?```", lambda m: m.group(0).replace("```", "").strip(), text)
    text = re.sub(r"`([^`]+)`", r"\1", text)
    text = re.sub(r"^#{1,6}\s+", "", text, flags=re.MULTILINE)
    text = re.sub(r"^\s*[-*+]\s+", "", text, flags=re.MULTILINE)
    text = re.sub(r"^\s*\d+\.\s+", "", text, flags=re.MULTILINE)
    text = text.replace("\n", " ")
    text = re.sub(r"[ \t]{2,}", " ", text)
    return text.strip()


def chunk_text_for_twitch(text: str, limit: int = 500) -> list[str]:
    cleaned = strip_markdown_for_twitch(text)
    if len(cleaned) <= limit:
        return [cleaned] if cleaned else []

    chunks = []
    remaining = cleaned
    while len(remaining) > limit:
        window = remaining[:limit]
        last_space = window.rfind(" ")
        if last_space == -1:
            chunks.append(window)
            remaining = remaining[limit:]
        else:
            chunks.append(window[:last_space])
            remaining = remaining[last_space + 1 :]
    if remaining:
        chunks.append(remaining)
    return chunks