"""Loads Microsoft Excel files."""
from typing import Any, List

from langchain.document_loaders.unstructured import (
    UnstructuredFileLoader,
    validate_unstructured_version,
)


class UnstructuredXMLLoader(UnstructuredFileLoader):
    """Loader that uses unstructured to load XML files.
    You can run the loader in one of two modes: "single" and "elements".
    If you use "single" mode, the document will be returned as a single
    langchain Document object. If you use "elements" mode, the unstructured
    library will split the document into elements such as Title and NarrativeText.
    You can pass in additional unstructured kwargs after mode to apply
    different unstructured settings.

    Examples
    --------
    from langchain.document_loaders import UnstructuredXMLLoader

    loader = UnstructuredXMLLoader(
        "example.xml", mode="elements", strategy="fast",
    )
    docs = loader.load()

    References
    ----------
    https://unstructured-io.github.io/unstructured/bricks.html#partition-xml
    """

    def __init__(
        self, file_path: str, mode: str = "single", **unstructured_kwargs: Any
    ):
        validate_unstructured_version(min_unstructured_version="0.6.7")
        super().__init__(file_path=file_path, mode=mode, **unstructured_kwargs)

    def _get_elements(self) -> List:
        from unstructured.partition.xml import partition_xml

        return partition_xml(filename=self.file_path, **self.unstructured_kwargs)
