"""DOCX 解析器（python-docx fallback）。"""

from app.core.logging import get_logger

logger = get_logger(__name__)


def parse_docx_with_python_docx(file_content: bytes) -> str | None:
    """用 python-docx 解析 DOCX，返回 Markdown 或 None（失败时）。"""
    try:
        import io

        from docx import Document

        doc = Document(io.BytesIO(file_content))
        md_parts = []

        for para in doc.paragraphs:
            text = para.text.strip()
            if not text:
                continue

            style = para.style.name.lower()
            if style.startswith("heading 1"):
                md_parts.append(f"# {text}")
            elif style.startswith("heading 2"):
                md_parts.append(f"## {text}")
            elif style.startswith("heading 3"):
                md_parts.append(f"### {text}")
            elif style.startswith("heading"):
                md_parts.append(f"#### {text}")
            elif style.startswith("list"):
                md_parts.append(f"- {text}")
            else:
                md_parts.append(text)

        # 处理表格
        for table in doc.tables:
            rows = []
            for row in table.rows:
                cells = [cell.text.strip() for cell in row.cells]
                rows.append("| " + " | ".join(cells) + " |")
            if rows:
                # 添加表头分隔行
                if len(rows) > 1:
                    sep = "| " + " | ".join(["---"] * len(table.columns)) + " |"
                    rows.insert(1, sep)
                md_parts.append("\n".join(rows))

        markdown = "\n\n".join(md_parts)
        return markdown if markdown.strip() else None
    except Exception as e:
        logger.warning("python-docx 解析失败: %s", e)
        return None