"""MarkItDown 解析器（优先）。"""

from app.core.logging import get_logger

logger = get_logger(__name__)


def parse_with_markitdown(file_content: bytes, filename: str) -> str | None:
    """用 MarkItDown 解析文档，返回 Markdown 或 None（失败时）。"""
    try:
        from markitdown import MarkItDown

        md = MarkItDown()
        # MarkItDown 需要文件路径或文件对象，用临时文件
        import tempfile
        from pathlib import Path

        suffix = Path(filename).suffix.lower()
        with tempfile.NamedTemporaryFile(suffix=suffix, delete=False) as tmp:
            tmp.write(file_content)
            tmp_path = tmp.name

        try:
            result = md.convert(tmp_path)
            return result.text_content if result and result.text_content else None
        finally:
            Path(tmp_path).unlink(missing_ok=True)
    except Exception as e:
        logger.warning("MarkItDown 解析失败 (%s): %s", filename, e)
        return None