# Copyright 2016 Peter Brittain
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
This module is just a collection of simple helper functions.
"""
from datetime import date, datetime


def readable_mem(mem):
    """
    :param mem: An integer number of bytes to convert to human-readable form.
    :return: A human-readable string representation of the number.
    """
    for suffix in ["", "K", "M", "G", "T"]:
        if mem < 10000:
            return "{}{}".format(int(mem), suffix)
        mem /= 1024
    return "{}P".format(int(mem))


def readable_timestamp(stamp):
    """
    :param stamp: A floating point number representing the POSIX file timestamp.
    :return: A short human-readable string representation of the timestamp.
    """
    if date.fromtimestamp(stamp) == date.today():
        return str(datetime.fromtimestamp(stamp).strftime("%I:%M:%S%p"))
    else:
        return str(date.fromtimestamp(stamp))


class _DotDict(dict):
    """
    Modified dictionary to allow dot notation access.

    This can be used for quick and easy structures.  See https://stackoverflow.com/q/2352181/4994021
    """

    __getattr__ = dict.get
    __setattr__ = dict.__setitem__
    __delattr__ = dict.__delitem__