class Protobuf < Formula
  desc "Protocol buffers (Google's data interchange format)"
  homepage "https://github.com/protocolbuffers/protobuf/"
  url "https://github.com/protocolbuffers/protobuf/releases/download/v3.13.0/protobuf-all-3.13.0.tar.gz"
  sha256 "465fd9367992a9b9c4fba34a549773735da200903678b81b25f367982e8df376"
  license "BSD-3-Clause"

  livecheck do
    url "https://github.com/protocolbuffers/protobuf/releases/latest"
    regex(%r{href=.*?/tag/v?(\d+(?:\.\d+)+)["' >]}i)
  end

  bottle do
    sha256 "af2990ba0a6e5588ef2afbe2ea3378d3ef0ccb287bca040607b40b5628801113" => :catalina
    sha256 "0a5b436cc6be687df3767294952475adc81744c241595ec55b32efbfdd3d1f38" => :mojave
    sha256 "ca05568f7d2e45bab389b1e6024f38c79f86fa90fc66371453fd4e89bc62da1d" => :high_sierra
    sha256 "7adc6b2ba8bc67bd2ddd0acbed8c577f3b3cea7d474a9e1a356516b4b6c39ee9" => :x86_64_linux
  end

  head do
    url "https://github.com/protocolbuffers/protobuf.git"

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

  depends_on "python@3.8" => [:build, :test]

  resource "six" do
    url "https://files.pythonhosted.org/packages/6b/34/415834bfdafca3c5f451532e8a8d9ba89a21c9743a0c59fbd0205c7f9426/six-1.15.0.tar.gz"
    sha256 "30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"
  end

  unless OS.mac?
    fails_with gcc: "4"
    fails_with gcc: "5"
    depends_on "gcc@6"
  end

  def install
    # Don't build in debug mode. See:
    # https://github.com/Homebrew/homebrew/issues/9279
    # https://github.com/protocolbuffers/protobuf/blob/5c24564811c08772d090305be36fae82d8f12bbe/configure.ac#L61
    ENV.prepend "CXXFLAGS", "-DNDEBUG"
    ENV.cxx11

    system "./autogen.sh" if build.head?
    system "./configure", "--disable-debug", "--disable-dependency-tracking",
                          "--prefix=#{prefix}", "--with-zlib"
    system "make"
    system "make", "check"
    system "make", "install"

    # Install editor support and examples
    pkgshare.install "editors/proto.vim", "examples"
    elisp.install "editors/protobuf-mode.el"

    ENV.append_to_cflags "-I#{include}"
    ENV.append_to_cflags "-L#{lib}"

    resource("six").stage do
      system Formula["python@3.8"].opt_bin/"python3", *Language::Python.setup_install_args(libexec)
    end
    chdir "python" do
      system Formula["python@3.8"].opt_bin/"python3", *Language::Python.setup_install_args(libexec),
                        "--cpp_implementation"
    end

    version = Language::Python.major_minor_version Formula["python@3.8"].opt_bin/"python3"
    site_packages = "lib/python#{version}/site-packages"
    pth_contents = "import site; site.addsitedir('#{libexec/site_packages}')\n"
    (prefix/site_packages/"homebrew-protobuf.pth").write pth_contents
  end

  test do
    testdata = <<~EOS
      syntax = "proto3";
      package test;
      message TestCase {
        string name = 4;
      }
      message Test {
        repeated TestCase case = 1;
      }
    EOS
    (testpath/"test.proto").write testdata
    system bin/"protoc", "test.proto", "--cpp_out=."
    system Formula["python@3.8"].opt_bin/"python3", "-c", "import google.protobuf"
  end
end
