from __future__ import annotations


class DocTextChunker:
    def __init__(self, max_chars: int = 4000, overlap_chars: int = 250) -> None:
        self._max_chars = max_chars
        self._overlap_chars = overlap_chars

    def split(self, text: str) -> list[str]:
        cleaned = text.strip()
        if not cleaned:
            return []
        chunks: list[str] = []
        start = 0
        while start < len(cleaned):
            end = min(len(cleaned), start + self._max_chars)
            chunks.append(cleaned[start:end].strip())
            if end >= len(cleaned):
                break
            start = max(0, end - self._overlap_chars)
        return [chunk for chunk in chunks if chunk]