import os

__all__ = ["available", "get_path"]

_module_path = os.path.dirname(__file__)
_available_dir = [p for p in next(os.walk(_module_path))[1] if not p.startswith("__")]
_available_zip = {"nybb": "nybb_16a.zip"}
available = _available_dir + list(_available_zip.keys())


def get_path(dataset):
    """
    Get the path to the data file.

    Parameters
    ----------
    dataset : str
        The name of the dataset. See ``geopandas.datasets.available`` for
        all options.

    Examples
    --------
    >>> geopandas.datasets.get_path("naturalearth_lowres")  # doctest: +SKIP
    '.../python3.8/site-packages/geopandas/datasets/\
naturalearth_lowres/naturalearth_lowres.shp'

    """
    if dataset in _available_dir:
        return os.path.abspath(os.path.join(_module_path, dataset, dataset + ".shp"))
    elif dataset in _available_zip:
        fpath = os.path.abspath(os.path.join(_module_path, _available_zip[dataset]))
        return "zip://" + fpath
    else:
        msg = "The dataset '{data}' is not available. ".format(data=dataset)
        msg += "Available datasets are {}".format(", ".join(available))
        raise ValueError(msg)