# -*- coding: utf-8 -*-
# MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
#
# Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
import hashlib
import os
import shutil
from tempfile import NamedTemporaryFile

import requests
from megfile import smart_copy, smart_getmd5, smart_getsize
from tqdm import tqdm

from ..logger import get_logger

logger = get_logger(__name__)

CHUNK_SIZE = 1024
HTTP_CONNECTION_TIMEOUT = 5


class HTTPDownloadError(BaseException):
    r"""The class that represents http request error."""


class Bar:
    def __init__(self, total=100):
        self._bar = tqdm(total=total, unit="iB", unit_scale=True, ncols=80)

    def __call__(self, bytes_num):
        self._bar.update(bytes_num)


def download_from_url(url: str, dst: str):
    r"""Downloads file from given url to ``dst``.

    Args:
        url: source URL.
        dst: saving path.
    """
    dst = os.path.expanduser(dst)
    smart_copy(url, dst, callback=Bar(total=smart_getsize(url)))
    return smart_getmd5(dst)