# Copyright 2015 Google Inc. All rights reserved.
#
# 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 setuptools import setup
from setuptools import Extension
from setuptools.command.build_ext import build_ext as BuildExt
from subprocess import Popen, PIPE

DIR = os.path.abspath(os.path.dirname(__file__))
LIB_DIR = DIR + "/c-bindings"
MODULE_SOURCES = ["python/_jsonnet.c"]


def get_version():
    """
    Parses the version out of vm.go
    """
    with open(os.path.join(DIR, "vm.go")) as f:
        for line in f:
            if "const" in line and "version" in line:
                v_code = line.partition("=")[2].strip('\n "')
                if v_code[0] == "v":
                    return v_code[1:]

    return None


class BuildJsonnetExt(BuildExt):
    def run(self):
        p = Popen(
            ["go", "build", "-x", "-o", "libgojsonnet.a", "-buildmode=c-archive"],
            cwd=LIB_DIR,
            stdout=PIPE,
        )
        p.wait()

        if p.returncode != 0:
            raise Exception("Could not build libgojsonnet.a")

        BuildExt.run(self)

jsonnet_ext = Extension(
    "_gojsonnet",
    sources=MODULE_SOURCES,
    extra_objects=[
        LIB_DIR + "/libgojsonnet.a",
    ],
    include_dirs=["cpp-jsonnet/include"],
    language="c++",
)

setup(
    name="gojsonnet",
    url="https://jsonnet.org",
    description="Python bindings for Jsonnet - The data templating language ",
    author="David Cunningham",
    author_email="dcunnin@google.com",
    version=get_version(),
    cmdclass={
        "build_ext": BuildJsonnetExt,
    },
    ext_modules=[jsonnet_ext],
)