"""XLSX 文件阅读器，支持多种解析方法。"""

import os
from typing import List, Optional, Tuple

from scripts.readers.base import BaseReader
from scripts.utils import is_valid_xlsx

from . import docling
from . import unstructured
from . import markitdown
from . import pandas
from . import native_xml


PARSERS = [
    ("docling", docling.parse),
    ("unstructured", unstructured.parse),
    ("MarkItDown", markitdown.parse),
    ("pandas", pandas.parse),
    ("XML 原生解析", native_xml.parse),
]


class XlsxReader(BaseReader):
    """XLSX 文件阅读器"""

    def supports(self, file_path: str) -> bool:
        return file_path.lower().endswith('.xlsx')

    def parse(self, file_path: str) -> Tuple[Optional[str], List[str]]:
        failures = []

        # 检查文件是否存在
        if not os.path.exists(file_path):
            return None, ["文件不存在"]

        # 验证文件格式
        if not is_valid_xlsx(file_path):
            return None, ["不是有效的 XLSX 文件"]

        content = None

        for parser_name, parser_func in PARSERS:
            content, error = parser_func(file_path)
            if content is not None:
                return content, failures
            else:
                failures.append(f"- {parser_name}: {error}")

        return None, failures