class Protobuf < Formula
  desc "Protocol buffers (Google's data interchange format)"
  homepage "https://github.com/google/protobuf/"
  url "https://github.com/google/protobuf/archive/v3.1.0.tar.gz"
  sha256 "0a0ae63cbffc274efb573bdde9a253e3f32e458c41261df51c5dbc5ad541e8f7"
  head "https://github.com/google/protobuf.git"

  bottle do
    sha256 "937351ede8db879b572c43994845d49a0dafc890a2ee0caf99c61b3ed75c2d76" => :sierra
    sha256 "561c3788b7b3cc1df6fce744c20c5ef85fd484cc3177e14525e262f0544b4fe5" => :el_capitan
    sha256 "902bc03d7ee53fb688ae428bc24aa33c1122b8bf40530da3b5e8f6883e3ec125" => :yosemite
  end

  # this will double the build time approximately if enabled
  option "with-test", "Run build-time check"
  option "without-python", "Build without python support"
  option :universal
  option :cxx11

  deprecated_option "with-check" => "with-test"

  depends_on "autoconf" => :build
  depends_on "automake" => :build
  depends_on "libtool" => :build
  depends_on :python => :recommended if MacOS.version <= :snow_leopard

  resource "setuptools" do
    url "https://pypi.python.org/packages/df/c3/4265eb901f9db8c0ea5bdfb344084d85bc96c1a9b883f70430254b5491f6/setuptools-26.1.0.tar.gz"
    sha256 "64a2f7676cd026b64e46d179ed26b365e2f92f26c7fe04228ddd86d0436b797f"
  end

  resource "six" do
    url "https://pypi.python.org/packages/source/s/six/six-1.10.0.tar.gz"
    sha256 "105f8d68616f8248e24bf0e9372ef04d3cc10104f1980f54d57b2ce73a5ad56a"
  end

  resource "python-dateutil" do
    url "https://pypi.python.org/packages/3e/f5/aad82824b369332a676a90a8c0d1e608b17e740bbb6aeeebca726f17b902/python-dateutil-2.5.3.tar.gz"
    sha256 "1408fdb07c6a1fa9997567ce3fcee6a337b39a503d80699e0f213de4aa4b32ed"
  end

  resource "pytz" do
    url "https://pypi.python.org/packages/f7/c7/08e54702c74baf9d8f92d0bc331ecabf6d66a56f6d36370f0a672fc6a535/pytz-2016.6.1.tar.bz2"
    sha256 "b5aff44126cf828537581e534cc94299b223b945a2bb3b5434d37bf8c7f3a10c"
  end

  resource "python-gflags" do
    url "https://pypi.python.org/packages/91/97/84778286b3a1c0d52533a35a0b70a477050df2b83229f56e99c7a0f2d9d6/python-gflags-3.0.6.tar.gz"
    sha256 "e904b251cb1d70ddd3a1fd152bd4b3674a95981dcac497450efd1311ff2b9b5a"
  end

  resource "google-apputils" do
    url "https://pypi.python.org/packages/source/g/google-apputils/google-apputils-0.4.2.tar.gz"
    sha256 "47959d0651c32102c10ad919b8a0ffe0ae85f44b8457ddcf2bdc0358fb03dc29"
  end

  # Upstream's autogen script fetches this if not present
  # but does no integrity verification & mandates being online to install.
  resource "gmock" do
    url "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/googlemock/gmock-1.7.0.zip"
    mirror "https://dl.bintray.com/homebrew/mirror/gmock-1.7.0.zip"
    sha256 "26fcbb5925b74ad5fc8c26b0495dfc96353f4d553492eb97e85a8a6d2f43095b"
  end

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

    (buildpath/"gmock").install resource("gmock")
    system "./autogen.sh"

    system "./configure", "--disable-debug", "--disable-dependency-tracking",
                          "--prefix=#{prefix}", "--with-zlib"
    system "make"
    system "make", "check" if build.with?("test") || build.bottle?
    system "make", "install"

    # Install editor support and examples
    doc.install "editors", "examples"

    if build.with? "python"
      # google-apputils is a build-time dependency
      ENV.prepend_create_path "PYTHONPATH", buildpath/"homebrew/lib/python2.7/site-packages"
      %w[setuptools six python-dateutil pytz python-gflags google-apputils].each do |package|
        resource(package).stage do
          system "python", *Language::Python.setup_install_args(buildpath/"homebrew")
        end
      end
      # google is a namespace package and .pth files aren't processed from
      # PYTHONPATH
      touch buildpath/"homebrew/lib/python2.7/site-packages/google/__init__.py"
      chdir "python" do
        ENV.append_to_cflags "-I#{include}"
        ENV.append_to_cflags "-L#{lib}"
        args = Language::Python.setup_install_args libexec
        args << "--cpp_implementation"
        system "python", *args
      end
      site_packages = "lib/python2.7/site-packages"
      pth_contents = "import site; site.addsitedir('#{libexec/site_packages}')\n"
      (prefix/site_packages/"homebrew-protobuf.pth").write pth_contents
    end
  end

  def caveats; <<-EOS.undent
    Editor support and examples have been installed to:
      #{doc}
    EOS
  end

  test do
    testdata = <<-EOS.undent
      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 "python", "-c", "import google.protobuf" if build.with? "python"
  end
end