from __future__ import annotations


def sanitize_gfm_text(text: str) -> str:
    return text.replace("\x00", "")


def chunk_gfm_markdown(text: str, limit: int = 65000) -> list[str]:
    if len(text) <= limit:
        return [text]

    chunks: list[str] = []
    in_code_block = False
    current = ""

    for line in text.split("\n"):
        stripped = line.strip()
        if stripped.startswith("```"):
            in_code_block = not in_code_block

        candidate = current + line + "\n"
        if len(candidate) > limit and not in_code_block:
            chunks.append(current.rstrip())
            current = line + "\n"
        else:
            current = candidate

    if current.strip():
        chunks.append(current.rstrip())

    return chunks if chunks else [text]