class Libtensorflow < Formula
  desc "C interface for Google's OS library for Machine Intelligence"
  homepage "https://www.tensorflow.org/"
  url "https://github.com/tensorflow/tensorflow/archive/v1.7.0.tar.gz"
  sha256 "2df5e308357356c9ffb7e9a7816dfa9947bd8928f9d406cf7e851b82853931ea"

  bottle do
    cellar :any
    sha256 "efd5b36759a20973be4a5d12ef848b808b45545b4c9a47289b4b8d59f270b4e1" => :high_sierra
    sha256 "214cb0815ef718787618f66d41b9758ed737b603ae3ea0daa6963b53a93c917e" => :sierra
    sha256 "4f1753ea7c5e75bd49a200d62057e399a74664facb5f07b697b16cb1467374fe" => :el_capitan
  end

  depends_on "bazel" => :build
  depends_on :java => ["1.8", :build]

  def install
    cmd = Language::Java.java_home_cmd("1.8")
    ENV["JAVA_HOME"] = Utils.popen_read(cmd).chomp

    ENV["PYTHON_BIN_PATH"] = which("python").to_s
    ENV["CC_OPT_FLAGS"] = "-march=native"
    ENV["TF_NEED_JEMALLOC"] = "1"
    ENV["TF_NEED_GCP"] = "0"
    ENV["TF_NEED_HDFS"] = "0"
    ENV["TF_ENABLE_XLA"] = "0"
    ENV["USE_DEFAULT_PYTHON_LIB_PATH"] = "1"
    ENV["TF_NEED_OPENCL"] = "0"
    ENV["TF_NEED_CUDA"] = "0"
    ENV["TF_NEED_MKL"] = "0"
    ENV["TF_NEED_VERBS"] = "0"
    ENV["TF_NEED_MPI"] = "0"
    ENV["TF_NEED_S3"] = "1"
    ENV["TF_NEED_GDR"] = "0"
    system "./configure"

    system "bazel", "build", "--compilation_mode=opt", "--copt=-march=native", "tensorflow:libtensorflow.so"
    lib.install Dir["bazel-bin/tensorflow/*.so"]
    (include/"tensorflow/c").install "tensorflow/c/c_api.h"
    (lib/"pkgconfig/tensorflow.pc").write <<~EOS
      Name: tensorflow
      Description: Tensorflow library
      Version: #{version}
      Libs: -L#{lib} -ltensorflow
      Cflags: -I#{include}
    EOS
  end

  test do
    (testpath/"test.c").write <<~EOS
      #include <stdio.h>
      #include <tensorflow/c/c_api.h>
      int main() {
        printf("%s", TF_Version());
      }
    EOS
    system ENV.cc, "-L#{lib}", "-ltensorflow", "-o", "test_tf", "test.c"
    assert_equal version, shell_output("./test_tf")
  end
end