class Ntl < Formula
  desc "C++ number theory library"
  homepage "http://www.shoup.net/ntl"
  url "http://www.shoup.net/ntl/ntl-10.5.0.tar.gz"
  sha256 "b90b36c9dd8954c9bc54410b1d57c00be956ae1db5a062945822bbd7a86ab4d2"

  bottle do
    cellar :any
    sha256 "d3b7cb343a1b590d0e21cbac76ffa40d59dfd59986aa5cd6c8234c7a9797e4be" => :high_sierra
    sha256 "34e952fe458afc912c0822a3db858b843270dc4b6bea3b73eac52b3b29761d77" => :sierra
    sha256 "d34ad4f67e21327db85b1007626f77f6e5c87857707b53a3419dce6886418331" => :el_capitan
  end

  depends_on "gmp"

  def install
    args = ["PREFIX=#{prefix}", "SHARED=on"]

    cd "src" do
      system "./configure", *args
      system "make"
      system "make", "install"
    end
  end

  test do
    (testpath/"square.cc").write <<~EOS
      #include <iostream>
      #include <NTL/ZZ.h>

      int main()
      {
          NTL::ZZ a;
          std::cin >> a;
          std::cout << NTL::power(a, 2);
          return 0;
      }
    EOS
    gmp = Formula["gmp"]
    flags = %W[
      -I#{include}
      -L#{gmp.opt_lib}
      -L#{lib}
      -lntl
      -lgmp
    ]
    system ENV.cxx, "square.cc", "-o", "square", *flags
    assert_equal "4611686018427387904", pipe_output("./square", "2147483648")
  end
end