# Copyright (C) 2022 Luigi Pertoldi <gipert@pm.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

from __future__ import annotations

import json
import logging
from pathlib import Path

import yaml

log = logging.getLogger(__name__)

__file_extensions__ = {"json": [".json"], "yaml": [".yaml", ".yml"]}


def load_dict(fname: str, ftype: str | None = None) -> dict:
    """Load a text file as a Python dict."""
    fname = Path(fname)

    # determine file type from extension
    if ftype is None:
        for _ftype, exts in __file_extensions__.items():
            if fname.suffix in exts:
                ftype = _ftype

    msg = f"loading {ftype} dict from: {fname}"
    log.debug(msg)

    with fname.open() as f:
        if ftype == "json":
            return json.load(f)
        if ftype == "yaml":
            return yaml.safe_load(f)

        msg = f"unsupported file format {ftype}"
        raise NotImplementedError(msg)
