class Tbb < Formula
  desc "Rich and complete approach to parallelism in C++"
  homepage "https://www.threadingbuildingblocks.org/"
  url "https://github.com/01org/tbb/archive/2019_U4.tar.gz"
  version "2019_U4"
  sha256 "342a0a2cd583879850658284b86e9351ea019b4f3fcd731f4c18456f0ce9f900"

  bottle do
    cellar :any
    sha256 "0f2810f2137cc02f4ed9dcd19e10c9c305b9be6c4b1b24ecbf8ef543ae6c91e2" => :mojave
    sha256 "4d50a2091e3e275f1fbe9c25f29cf1448ae01887862924bc2a94702e67f3adee" => :high_sierra
    sha256 "877768fb618aa28de419e5cabdb11ae9bc77c82bf6d73e843b220814029c1854" => :sierra
  end

  depends_on "cmake" => :build
  depends_on "swig" => :build
  # requires malloc features first introduced in Lion
  # https://github.com/Homebrew/homebrew/issues/32274

  depends_on "python"

  def install
    compiler = (ENV.compiler == :clang) ? "clang" : "gcc"
    system "make", "tbb_build_prefix=BUILDPREFIX", "compiler=#{compiler}"
    lib.install Dir["build/BUILDPREFIX_release/*.dylib"]

    # Build and install static libraries
    system "make", "tbb_build_prefix=BUILDPREFIX", "compiler=#{compiler}",
                   "extra_inc=big_iron.inc"
    lib.install Dir["build/BUILDPREFIX_release/*.a"]
    include.install "include/tbb"

    cd "python" do
      ENV["TBBROOT"] = prefix
      system "python3", *Language::Python.setup_install_args(prefix)
    end

    system "cmake", "-DTBB_ROOT=#{prefix}",
                    "-DTBB_OS=Darwin",
                    "-DSAVE_TO=lib/cmake/TBB",
                    "-P", "cmake/tbb_config_generator.cmake"

    (lib/"cmake"/"TBB").install Dir["lib/cmake/TBB/*.cmake"]
  end

  test do
    (testpath/"test.cpp").write <<~EOS
      #include <tbb/task_scheduler_init.h>
      #include <iostream>

      int main()
      {
        std::cout << tbb::task_scheduler_init::default_num_threads();
        return 0;
      }
    EOS
    system ENV.cxx, "test.cpp", "-L#{lib}", "-ltbb", "-o", "test"
    system "./test"
  end
end