from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import os
import re
import shutil
import subprocess
import sys

from setuptools import setup, find_packages, Distribution
import setuptools.command.build_ext as _build_ext

# Ideally, we could include these files by putting them in a
# MANIFEST.in or using the package_data argument to setup, but the
# MANIFEST.in gets applied at the very beginning when setup.py runs
# before these files have been created, so we have to move the files
# manually.

# NOTE: The lists below must be kept in sync with ray/CMakeLists.txt.

ray_files = [
    "ray/core/src/ray/thirdparty/redis/src/redis-server",
    "ray/core/src/ray/gcs/redis_module/libray_redis_module.so",
    "ray/core/src/plasma/plasma_store_server",
    "ray/core/src/ray/raylet/liblocal_scheduler_library_python.so",
    "ray/core/src/ray/raylet/raylet_monitor", "ray/core/src/ray/raylet/raylet",
    "ray/WebUI.ipynb"
]

# These are the directories where automatically generated Python flatbuffer
# bindings are created.
generated_python_directories = [
    "ray/core/generated", "ray/core/generated/ray",
    "ray/core/generated/ray/protocol"
]

optional_ray_files = []

ray_ui_files = [
    "ray/core/src/catapult_files/index.html",
    "ray/core/src/catapult_files/trace_viewer_full.html"
]

ray_autoscaler_files = [
    "ray/autoscaler/aws/example-full.yaml",
    "ray/autoscaler/gcp/example-full.yaml",
    "ray/autoscaler/local/example-full.yaml",
]

if "RAY_USE_NEW_GCS" in os.environ and os.environ["RAY_USE_NEW_GCS"] == "on":
    ray_files += [
        "ray/core/src/credis/build/src/libmember.so",
        "ray/core/src/credis/build/src/libmaster.so",
        "ray/core/src/credis/redis/src/redis-server"
    ]

# The UI files are mandatory if the INCLUDE_UI environment variable equals 1.
# Otherwise, they are optional.
if "INCLUDE_UI" in os.environ and os.environ["INCLUDE_UI"] == "1":
    ray_files += ray_ui_files
else:
    optional_ray_files += ray_ui_files

optional_ray_files += ray_autoscaler_files

extras = {
    "rllib": ["pyyaml", "gym[atari]", "opencv-python", "lz4", "scipy"],
    "debug": ["psutil", "setproctitle", "py-spy"],
}


class build_ext(_build_ext.build_ext):
    def run(self):
        # Note: We are passing in sys.executable so that we use the same
        # version of Python to build pyarrow inside the build.sh script. Note
        # that certain flags will not be passed along such as --user or sudo.
        # TODO(rkn): Fix this.
        subprocess.check_call(["../build.sh", "-p", sys.executable])

        # We also need to install pyarrow along with Ray, so make sure that the
        # relevant non-Python pyarrow files get copied.
        pyarrow_files = []
        for (root, dirs, filenames) in os.walk("./ray/pyarrow_files/pyarrow"):
            for name in filenames:
                pyarrow_files.append(os.path.join(root, name))

        files_to_include = ray_files + pyarrow_files

        # Copy over the autogenerated flatbuffer Python bindings.
        for directory in generated_python_directories:
            for filename in os.listdir(directory):
                if filename[-3:] == ".py":
                    files_to_include.append(os.path.join(directory, filename))

        for filename in files_to_include:
            self.move_file(filename)

        # Try to copy over the optional files.
        for filename in optional_ray_files:
            try:
                self.move_file(filename)
            except Exception:
                print("Failed to copy optional file {}. This is ok."
                      .format(filename))

    def move_file(self, filename):
        # TODO(rkn): This feels very brittle. It may not handle all cases. See
        # https://github.com/apache/arrow/blob/master/python/setup.py for an
        # example.
        source = filename
        destination = os.path.join(self.build_lib, filename)
        # Create the target directory if it doesn't already exist.
        parent_directory = os.path.dirname(destination)
        if not os.path.exists(parent_directory):
            os.makedirs(parent_directory)
        print("Copying {} to {}.".format(source, destination))
        shutil.copy(source, destination)


class BinaryDistribution(Distribution):
    def has_ext_modules(self):
        return True


def find_version(*filepath):
    # Extract version information from filepath
    here = os.path.abspath(os.path.dirname(__file__))
    with open(os.path.join(here, *filepath)) as fp:
        version_match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]",
                                  fp.read(), re.M)
        if version_match:
            return version_match.group(1)
        raise RuntimeError("Unable to find version string.")


requires = [
    "numpy",
    "funcsigs",
    "click",
    "colorama",
    "pytest",
    "pyyaml",
    "redis",
    # The six module is required by pyarrow.
    "six >= 1.0.0",
    "flatbuffers",
]

if sys.version_info < (3, 0):
    requires.append("faulthandler")

setup(
    name="ray",
    version=find_version("ray", "__init__.py"),
    description=("A system for parallel and distributed Python that unifies "
                 "the ML ecosystem."),
    long_description=open("../README.rst").read(),
    url="https://github.com/ray-project/ray",
    keywords=("ray distributed parallel machine-learning "
              "reinforcement-learning deep-learning python"),
    packages=find_packages(),
    cmdclass={"build_ext": build_ext},
    # The BinaryDistribution argument triggers build_ext.
    distclass=BinaryDistribution,
    install_requires=requires,
    setup_requires=["cython >= 0.27, < 0.28"],
    extras_require=extras,
    entry_points={
        "console_scripts": [
            "ray=ray.scripts.scripts:main",
            "rllib=ray.rllib.scripts:cli [rllib]"
        ]
    },
    include_package_data=True,
    zip_safe=False,
    license="Apache 2.0")
