class Mesa < Formula
  include Language::Python::Virtualenv
  desc "Graphics Library"
  homepage "https://www.mesa3d.org/"
  url "https://mesa.freedesktop.org/archive/mesa-19.3.1.tar.xz"
  mirror "https://www.mesa3d.org/archive/mesa-19.3.1.tar.xz"
  sha256 "cd951db69c56a97ff0570a7ab2c0e39e6c5323f4cd8f4eb8274723e033beae59"
  head "https://gitlab.freedesktop.org/mesa/mesa.git"

  bottle do
    cellar :any
    sha256 "5ee2dacdade277620501c0347b5df62ec11456117077028e195e1d35981e6965" => :catalina
    sha256 "a054adddeff44fe779b236ff57fe3b2259c9894651d417342ca2ecd321dce8a8" => :mojave
    sha256 "78f8e0fa3600101e6f48fb0e6d42127ecdafadd7f2d1598b3bb2fe0cb55cbb64" => :high_sierra
  end

  depends_on "meson-internal" => :build
  depends_on "ninja" => :build
  depends_on "pkg-config" => :build
  depends_on "python" => :build
  depends_on "freeglut" => :test
  depends_on "expat"
  depends_on "gettext"

  resource "Mako" do
    url "https://files.pythonhosted.org/packages/b0/3c/8dcd6883d009f7cae0f3157fb53e9afb05a0d3d33b3db1268ec2e6f4a56b/Mako-1.1.0.tar.gz"
    sha256 "a36919599a9b7dc5d86a7a8988f23a9a3a3d083070023bab23d64f7f1d1e0a4b"
  end

  resource "gears.c" do
    url "https://www.opengl.org/archives/resources/code/samples/glut_examples/mesademos/gears.c"
    sha256 "7df9d8cda1af9d0a1f64cc028df7556705d98471fdf3d0830282d4dcfb7a78cc"
  end

  def install
    xy = Language::Python.major_minor_version "python3"
    ENV.prepend_create_path "PYTHONPATH", buildpath/"vendor/lib/python#{xy}/site-packages"

    resource("Mako").stage do
      system "python3", *Language::Python.setup_install_args(buildpath/"vendor")
    end

    resource("gears.c").stage(pkgshare.to_s)

    mkdir "build" do
      system "meson", "--prefix=#{prefix}", "-Dbuildtype=plain", "-Db_ndebug=true", "-Dplatforms=surfaceless", "-Dglx=disabled", ".."
      system "ninja"
      system "ninja", "install"
    end
  end

  test do
    flags = %W[
      -framework OpenGL
      -I#{Formula["freeglut"].opt_include}
      -L#{Formula["freeglut"].opt_lib}
      -lglut
    ]
    system ENV.cc, "#{pkgshare}/gears.c", "-o", "gears", *flags
  end
end