#! /usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Copyright 2021, Nils Hilbricht, Germany ( https://www.hilbricht.net )

The Non-Session-Manager by Jonathan Moore Liles <male@tuxfamily.org>: http://non.tuxfamily.org/nsm/
New Session Manager, by LinuxAudio.org: https://github.com/linuxaudio/new-session-manager
With help from code fragments from https://github.com/attwad/python-osc ( DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE v2 )

This file is part of the Laborejo Software Suite ( https://www.laborejo.org ).

This application 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 <http://www.gnu.org/licenses/>.
"""

#https://stackoverflow.com/questions/24937495/how-can-i-calculate-a-hash-for-a-filesystem-directory-using-python

import hashlib
from _hashlib import HASH as Hash
from pathlib import Path
from typing import Union

def md5_update_from_dir(directory, hash):
    assert Path(directory).is_dir()
    for path in sorted(Path(directory).iterdir(), key=lambda p: str(p).lower()):
        hash.update(path.name.encode())
        if path.is_file():
            with open(path, "rb") as f:
                for chunk in iter(lambda: f.read(4096), b""):
                    hash.update(chunk)
        elif path.is_dir():
            hash = md5_update_from_dir(path, hash)
    return hash


def md5_dir(directory):
    return md5_update_from_dir(directory, hashlib.md5()).hexdigest()