# Copyright (c) 2013, Thomas P. Robitaille
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

from __future__ import (unicode_literals, division, print_function,
                        absolute_import)

import time
import argparse

children = []


def get_percent(process):
    return process.cpu_percent()


def get_memory(process):
    return process.memory_info()


def all_children(pr):

    global children

    try:
        children_of_pr = pr.children(recursive=True)
    except Exception:  # pragma: no cover
        return children

    for child in children_of_pr:
        if child not in children:
            children.append(child)

    return children


def main():

    parser = argparse.ArgumentParser(
        description='Record CPU and memory usage for a process')

    parser.add_argument('process_id_or_command', type=str,
                        help='the process id or command')

    parser.add_argument('--log', type=str,
                        help='output the statistics to a file')

    parser.add_argument('--plot', type=str,