# -*- coding: utf-8 -*-

__author__ = 'Patrick Michl'
__email__ = 'frootlab@gmail.com'
__license__ = 'GPLv3'

import nemoa
from nemoa.dataset.imports import archive, text

def filetypes(filetype=None):
    """Get supported dataset import filetypes."""

    type_dict = {}

    # get supported archive filetypes
    archive_types = archive.filetypes()
    for key, val in list(archive_types.items()):
        type_dict[key] = ('archive', val)

    # get supported text filetypes
    text_types = text.filetypes()
    for key, val in list(text_types.items()):
        type_dict[key] = ('text', val)

    if filetype is None:
        return {key: val[1] for key, val in list(type_dict.items())}
    if filetype in type_dict:
        return type_dict[filetype]

    return False

def load(path, filetype=None, **kwds):
    """Import dataset dictionary from file or workspace."""

    import os

    from flib.base import env

    # get path (if necessary)
    if 'workspace' in kwds or not os.path.isfile(path):
        name = path
        pathkwds = {}
        if 'workspace' in kwds:
            pathkwds['workspace'] = kwds.pop('workspace')
        if 'base' in kwds:
            pathkwds['base'] = kwds.pop('base')
        path = nemoa.path('dataset', name, **pathkwds)
        if not path:
            raise Warning("""could not import dataset:
                invalid dataset name.""") or {}
        if not os.path.isfile(path):
            raise Warning("""could not import dataset:
                file '%s' does not exist.""" % path) or {}

    # get filtype from file extension if not given
    # and check if filetype is supported
    if not filetype: filetype = env.fileext(path).lower()
    if filetype not in filetypes():
        raise ValueError(f"filetype '{filetype}' is not supported")

    # import and check dictionary
    mname = filetypes(filetype)[0]
    if mname == 'archive': dataset = archive.load(path, **kwds)
    elif mname == 'text': dataset = text.load(path, **kwds)
    else: dataset = None
    if not dataset:
        raise ValueError("""could not import dataset:
            file '%s' is not valid.""" % path) or {}

    # update path
    dataset['config']['path'] = path

    return dataset
