class Clhep < Formula
  desc "Class Library for High Energy Physics"
  homepage "https://proj-clhep.web.cern.ch/proj-clhep/"
  url "https://proj-clhep.web.cern.ch/proj-clhep/DISTRIBUTION/tarFiles/clhep-2.3.4.5.tgz"
  sha256 "1199d04626cb8bc1307e282b143018691077cc61fe2f286a382030262eda8764"

  bottle do
    cellar :any
    sha256 "ae015425dbf66a7df58e21f4997ea5c44ac82c9e3291711a77621e7ecdf4a0c3" => :high_sierra
    sha256 "3a5b69586ffdc7d697a4f2dce52016f245a234819f166e7931ced97eea399117" => :sierra
    sha256 "415c707d943967dde9a90fba1a740fcdbd497e01f0b51b82f31d583641e2e3dd" => :el_capitan
  end

  head do
    url "https://gitlab.cern.ch/CLHEP/CLHEP.git"

    depends_on "automake" => :build
    depends_on "autoconf" => :build
  end

  depends_on "cmake" => :build

  def install
    # CLHEP is super fussy and doesn't allow source tree builds
    dir = Dir.mktmpdir
    cd dir do
      args = std_cmake_args
      if build.stable?
        args << buildpath/"CLHEP"
      else
        args << buildpath
      end
      system "cmake", *args
      system "make", "install"
    end
  end

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

      int main() {
        CLHEP::Hep3Vector aVec(1, 2, 3);
        std::cout << "r: " << aVec.mag();
        std::cout << " phi: " << aVec.phi();
        std::cout << " cos(theta): " << aVec.cosTheta() << std::endl;
        return 0;
      }
    EOS
    system ENV.cxx, "-L#{lib}", "-lCLHEP", "-I#{include}/CLHEP",
           testpath/"test.cpp", "-o", "test"
    assert_equal "r: 3.74166 phi: 1.10715 cos(theta): 0.801784",
                 shell_output("./test").chomp
  end
end