class Glib < Formula
  include Language::Python::Shebang

  desc "Core application library for C"
  homepage "https://developer.gnome.org/glib/"
  url "https://download.gnome.org/sources/glib/2.68/glib-2.68.2.tar.xz"
  sha256 "ecc7798a9cc034eabdfd7f246e6dd461cdbf1175fcc2e9867cc7da7b7309e0fb"
  license "LGPL-2.1-or-later"

  bottle do
    sha256 arm64_big_sur: "8d54bf77009e8bc9e8d475bd691c9b6fe1a010e8b117349b81e62a8d5f9e16e5"
    sha256 big_sur:       "e33dfc5c9d1db7709398d6e5eaa7c3606398261f2a9c86ddc5c2cc693bc4fddd"
    sha256 catalina:      "9aa82da14cec600df6f1e14c441b2afb90b1b108f523249a7fcc35b2bef65d9c"
    sha256 mojave:        "f92893b84251244b0caf689533b93cac660fe6d7987c63791fddddb4e4621428"
    sha256 x86_64_linux:  "e0b6d9e2af8a5297235d1ae9062e81e1a0677c0211c3eead74a9b8cf40cdf9b7"
  end

  depends_on "meson" => :build
  depends_on "ninja" => :build
  depends_on "pkg-config" => :build
  depends_on "gettext"
  depends_on "libffi"
  depends_on "pcre"
  depends_on "python@3.9"

  on_linux do
    depends_on "util-linux"
  end

  # replace several hardcoded paths with homebrew counterparts
  patch do
    url "https://raw.githubusercontent.com/Homebrew/formula-patches/43467fd8dfc0e8954892ecc08fab131242dca025/glib/hardcoded-paths.diff"
    sha256 "d81c9e8296ec5b53b4ead6917f174b06026eeb0c671dfffc4965b2271fb6a82c"
  end

  def install
    inreplace %w[gio/xdgmime/xdgmime.c glib/gutils.c],
      "@@HOMEBREW_PREFIX@@", HOMEBREW_PREFIX

    # Disable dtrace; see https://trac.macports.org/ticket/30413
    args = std_meson_args + %W[
      --default-library=both
      --localstatedir=#{var}
      -Diconv=auto
      -Dgio_module_dir=#{HOMEBREW_PREFIX}/lib/gio/modules
      -Dbsymbolic_functions=false
      -Ddtrace=false
    ]

    mkdir "build" do
      system "meson", *args, ".."
      system "ninja", "-v"
      system "ninja", "install", "-v"
      bin.find { |f| rewrite_shebang detected_python_shebang, f }
    end

    # ensure giomoduledir contains prefix, as this pkgconfig variable will be
    # used by glib-networking and glib-openssl to determine where to install
    # their modules
    inreplace lib/"pkgconfig/gio-2.0.pc",
              "giomoduledir=#{HOMEBREW_PREFIX}/lib/gio/modules",
              "giomoduledir=${libdir}/gio/modules"

    on_macos do
      # `pkg-config --libs glib-2.0` includes -lintl, and gettext itself does not
      # have a pkgconfig file, so we add gettext lib and include paths here.
      gettext = Formula["gettext"].opt_prefix
      inreplace lib+"pkgconfig/glib-2.0.pc" do |s|
        s.gsub! "Libs: -L${libdir} -lglib-2.0 -lintl",
                "Libs: -L${libdir} -lglib-2.0 -L#{gettext}/lib -lintl"
        s.gsub! "Cflags: -I${includedir}/glib-2.0 -I${libdir}/glib-2.0/include",
                "Cflags: -I${includedir}/glib-2.0 -I${libdir}/glib-2.0/include -I#{gettext}/include"
      end
    end

    # `pkg-config --print-requires-private gobject-2.0` includes libffi,
    # but that package is keg-only so it needs to look for the pkgconfig file
    # in libffi's opt path.
    libffi = Formula["libffi"].opt_prefix
    inreplace lib+"pkgconfig/gobject-2.0.pc" do |s|
      s.gsub! "Requires.private: libffi",
              "Requires.private: #{libffi}/lib/pkgconfig/libffi.pc"
    end

    bash_completion.install Dir["gio/completion/*"]
  end

  def post_install
    (HOMEBREW_PREFIX/"lib/gio/modules").mkpath
  end

  test do
    (testpath/"test.c").write <<~EOS
      #include <string.h>
      #include <glib.h>

      int main(void)
      {
          gchar *result_1, *result_2;
          char *str = "string";

          result_1 = g_convert(str, strlen(str), "ASCII", "UTF-8", NULL, NULL, NULL);
          result_2 = g_convert(result_1, strlen(result_1), "UTF-8", "ASCII", NULL, NULL, NULL);

          return (strcmp(str, result_2) == 0) ? 0 : 1;
      }
    EOS
    system ENV.cc, "-o", "test", "test.c", "-I#{include}/glib-2.0",
                   "-I#{lib}/glib-2.0/include", "-L#{lib}", "-lglib-2.0"
    system "./test"
  end
end
