# 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.
import os
from distutils.command.build import build

from setuptools import setup, find_packages


base_dir = os.path.dirname(__file__)

about = {}
with open(os.path.join(base_dir, "cryptography", "__about__.py")) as f:
    exec(f.read(), about)


CFFI_DEPENDENCY = "cffi>=0.8"
SIX_DEPENDENCY = "six>=1.4.1"

requirements = [
    CFFI_DEPENDENCY,
    SIX_DEPENDENCY
]


class cffi_build(build):
    """
    This class exists, instead of just providing ``ext_modules=[...]`` directly
    in ``setup()`` because importing cryptography requires we have several
    packages installed first.

    By doing the imports here we ensure that packages listed in
    ``setup_requires`` are already installed.
    """

    def finalize_options(self):
        from cryptography.hazmat.bindings.commoncrypto.binding import (
            Binding as CommonCryptoBinding
        )
        from cryptography.hazmat.bindings.openssl.binding import (
            Binding as OpenSSLBinding
        )
        from cryptography.hazmat.primitives import constant_time, padding

        self.distribution.ext_modules = [
            OpenSSLBinding().ffi.verifier.get_extension(),
            constant_time._ffi.verifier.get_extension(),
            padding._ffi.verifier.get_extension()
        ]
        if CommonCryptoBinding.is_available():
            self.distribution.ext_modules.append(
                CommonCryptoBinding().ffi.verifier.get_extension()
            )

        build.finalize_options(self)


with open(os.path.join(base_dir, "README.rst")) as f:
    long_description = f.read()


setup(
    name=about["__title__"],
    version=about["__version__"],

    description=about["__summary__"],
    long_description=long_description,
    license=about["__license__"],
    url=about["__uri__"],

    author=about["__author__"],
    author_email=about["__email__"],

    classifiers=[
        "Intended Audience :: Developers",
        "License :: OSI Approved :: Apache Software License",
        "Natural Language :: English",
        "Operating System :: MacOS :: MacOS X",
        "Operating System :: POSIX",
        "Operating System :: POSIX :: BSD",
        "Operating System :: POSIX :: Linux",
        "Operating System :: Microsoft :: Windows",
        "Programming Language :: Python",
        "Programming Language :: Python :: 2",
        "Programming Language :: Python :: 2.6",
        "Programming Language :: Python :: 2.7",
        "Programming Language :: Python :: 3",
        "Programming Language :: Python :: 3.2",
        "Programming Language :: Python :: 3.3",
        "Programming Language :: Python :: Implementation :: CPython",
        "Programming Language :: Python :: Implementation :: PyPy",
        "Topic :: Security :: Cryptography",
    ],

    packages=find_packages(exclude=["tests", "tests.*"]),

    install_requires=requirements,
    setup_requires=requirements,

    # for cffi
    zip_safe=False,
    ext_package="cryptography",
    cmdclass={
        "build": cffi_build,
    }
)