# Copyright 2018 Google LLC
#
# 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.
'''Source: https://github.com/GoogleCloudPlatform/tensorflow-without-a-phd/blob/master/tensorflow-rl-pong/setup.py'''

from setuptools import find_packages
from setuptools import setup

#####
# We need to install some additional packages in order to compile
# OpenAI Gym on AI Platform.
# Reference:
# https://github.com/apache/beam/blob/master/sdks/python/apache_beam/examples/complete/juliaset/setup.py
import subprocess
from distutils.command.build import build as _build

import setuptools

class build(_build):
    """A build command class that will be invoked during package install.
    The package built using the current setup.py will be staged and later
    installed in the worker using `pip install package'. This class will be
    instantiated during install for this specific scenario and will trigger
    running the custom commands specified.
    """
    sub_commands = _build.sub_commands + [('CustomCommands', None)]

# The list of required libraries is taken from:
# https://github.com/openai/gym#installing-everything
_LIBS = 'python-numpy python-dev python-pyglet cmake zlib1g-dev libjpeg-dev xvfb libav-tools xorg-dev python-opengl libboost-all-dev libsdl2-dev swig'.split()

CUSTOM_COMMANDS = [
    ['apt-get', 'update'],
    ['apt-get', 'install', '-y'] + _LIBS,
]


class CustomCommands(setuptools.Command):
    """A setuptools Command class able to run arbitrary commands."""
    def initialize_options(self):
        pass

    def finalize_options(self):
        pass

    def RunCustomCommand(self, command_list):
        print 'Running command: %s' % command_list
        p = subprocess.Popen(
            command_list,
            stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        # Can use communicate(input='y\n'.encode()) if the command run requires
        # some confirmation.
        stdout_data, _ = p.communicate()
        print 'Command output: %s' % stdout_data
        if p.returncode != 0:
            raise RuntimeError('Command %s failed: exit code: %s' % (command_list, p.returncode))

    def run(self):
        for command in CUSTOM_COMMANDS:
            self.RunCustomCommand(command)


REQUIRED_PACKAGES = [
    'gym',
    'box2d-py==2.3.8',
    'ffmpeg'
]

setup(
    name='rl_on_gcp',
    version='0.1',
    install_requires=REQUIRED_PACKAGES,
    packages=find_packages(),
    include_package_data=True,
    description='RL continuous control.',
    cmdclass={
        # Command class instantiated and run during pip install scenarios.
        'build': build,
        'CustomCommands': CustomCommands,
    }
)

