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

import os
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.
ray_files = [
    "ray/core/src/common/thirdparty/redis/src/redis-server",
    "ray/core/src/common/redis_module/libray_redis_module.so",
    "ray/core/src/plasma/plasma_store",
    "ray/core/src/plasma/plasma_manager",
    "ray/core/src/local_scheduler/local_scheduler",
    "ray/core/src/local_scheduler/liblocal_scheduler_library.so",
    "ray/core/src/global_scheduler/global_scheduler",
    "ray/WebUI.ipynb"
]

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"
]

# 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": [
        "tensorflow", "pyyaml", "gym[atari]", "opencv-python",
        "python-snappy", "scipy"]
}


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", 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 = [
            os.path.join("ray/pyarrow_files/pyarrow", filename)
            for filename in os.listdir("./ray/pyarrow_files/pyarrow")
            if not os.path.isdir(os.path.join("ray/pyarrow_files/pyarrow",
                                              filename))]

        files_to_include = ray_files + pyarrow_files

        for filename in files_to_include:
            self.move_file(filename)
        # Copy over the autogenerated flatbuffer Python bindings.
        generated_python_directory = "ray/core/generated"
        for filename in os.listdir(generated_python_directory):
            if filename[-3:] == ".py":
                self.move_file(os.path.join(generated_python_directory,
                                            filename))

        # Try to copy over the optional files.
        for filename in optional_ray_files:
            try:
                self.move_file(filename)
            except Exception as e:
                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


setup(name="ray",
      # The version string is also in __init__.py. TODO(pcm): Fix this.
      version="0.3.1",
      packages=find_packages(),
      cmdclass={"build_ext": build_ext},
      # The BinaryDistribution argument triggers build_ext.
      distclass=BinaryDistribution,
      install_requires=["numpy",
                        "funcsigs",
                        "click",
                        "colorama",
                        "psutil",
                        "pytest",
                        "pyyaml",
                        "redis",
                        # The six module is required by pyarrow.
                        "six >= 1.0.0",
                        "flatbuffers"],
      setup_requires=["cython >= 0.23"],
      extras_require=extras,
      entry_points={"console_scripts": ["ray=ray.scripts.scripts:main"]},
      include_package_data=True,
      zip_safe=False,
      license="Apache 2.0")
