"""使用 pandas+xlrd 库解析 XLS 文件"""

from typing import Optional, Tuple


def parse(file_path: str) -> Tuple[Optional[str], Optional[str]]:
    """使用 pandas+xlrd 库解析 XLS 文件"""
    try:
        import pandas as pd
        from tabulate import tabulate
    except ImportError as e:
        if "pandas" in str(e):
            missing_lib = "pandas"
        elif "xlrd" in str(e):
            missing_lib = "xlrd"
        else:
            missing_lib = "tabulate"
        return None, f"{missing_lib} 库未安装"

    try:
        sheets = pd.read_excel(file_path, sheet_name=None, engine="xlrd")

        markdown_parts = []
        for sheet_name, df in sheets.items():
            if len(df) == 0:
                markdown_parts.append(f"## {sheet_name}\n\n*工作表为空*")
                continue

            table_md = tabulate(
                df, headers="keys", tablefmt="pipe", showindex=True, missingval=""
            )
            markdown_parts.append(f"## {sheet_name}\n\n{table_md}")

        if not markdown_parts:
            return None, "Excel 文件为空"

        markdown_content = "# Excel数据转换结果\n\n" + "\n\n".join(markdown_parts)

        return markdown_content, None
    except Exception as e:
        return None, f"pandas 解析失败: {str(e)}"