"""
“Copyright 2021 Hangar.org”

This file is part of 3D-tester.

3D-tester is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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/>.
"""

import os
from pathlib import Path

MODEL_TYPES = ['gltf', 'obj', 'fbx', 'stl']

def get_directory_content(dir_path):
    content = []
    for p in Path(dir_path).iterdir():
        file = Path(p)
        model_type = (Path(file.name).suffix).lstrip('.').lower()
        is_object_file = True if model_type in MODEL_TYPES else False
        item = {
                'name': os.path.basename(p),
                'size': human_readable_bytes(os.path.getsize(p)),
                'is_dir': True if p.is_dir() else False,
                'is_object_file': is_object_file
        }
        content.append(item)
    return content


def human_readable_bytes(bytes):
    """ 1 KibiByte == 1024 Bytes
        1 Mebibyte == 1024*1024 Bytes
        1 GibiByte == 1024*1024*1024 Bytes
    """
    if bytes == 0:
        return "0 KB"
    if bytes < 1024*1024:
        return f"{int(round(bytes/(1024), 2))} KB"
    if bytes < 1024*1024*1024:
        return f"{int(round(bytes/(1024*1024), 2))} MB"
    return f"{int(round(bytes/(1024*1024*1024), 2))} GB"