{ lib
, stdenv
, fetchurl
, pkg-config
, glib
, gdk-pixbuf
, installShellFiles
, pango
, cairo
, libxml2
, bzip2
, libintl
, ApplicationServices
, Foundation
, libobjc
, rustPlatform
, rustc
, rust
, cargo-auditable-cargo-wrapper
, gi-docgen
, python3Packages
, gnome
, vala
, writeScript
, withIntrospection ? stdenv.hostPlatform.emulatorAvailable buildPackages
, buildPackages
, gobject-introspection
, _experimental-update-script-combinators
, common-updater-scripts
, jq
, nix

# for passthru.tests
, enlightenment
, ffmpeg
, gegl
, gimp
, imagemagick
, imlib2
, vips
, xfce
}:

stdenv.mkDerivation (finalAttrs: {
  pname = "librsvg";
  version = "2.56.3";

  outputs = [ "out" "dev" ] ++ lib.optionals withIntrospection [
    "devdoc"
  ];

  src = fetchurl {
    url = "mirror://gnome/sources/librsvg/${lib.versions.majorMinor finalAttrs.version}/librsvg-${finalAttrs.version}.tar.xz";
    hash = "sha256-WjKASKAtAUZFzSf2EUD04LESgPssfyohhk/gxZrBzog=";
  };

  cargoDeps = rustPlatform.fetchCargoTarball {
    inherit (finalAttrs) src;
    name = "librsvg-deps-${finalAttrs.version}";
    hash = "sha256-s7eNMSdajr2VhB/BPVUFftHhHKCqpR9sTfxfWwag1mI=";
    # TODO: move this to fetchCargoTarball
    dontConfigure = true;
  };

  strictDeps = true;

  depsBuildBuild = [
    pkg-config
  ];

  nativeBuildInputs = [
    gdk-pixbuf
    installShellFiles
    pkg-config
    rustc
    cargo-auditable-cargo-wrapper
    python3Packages.docutils
    vala
    rustPlatform.cargoSetupHook
  ] ++ lib.optionals withIntrospection [
    gobject-introspection
    gi-docgen
  ];

  buildInputs = [
    libxml2
    bzip2
    pango
    libintl
    vala # for share/vala/Makefile.vapigen
  ] ++ lib.optionals stdenv.isDarwin [
    ApplicationServices
    Foundation
    libobjc
  ];

  propagatedBuildInputs = [
    glib
    gdk-pixbuf
    cairo
  ];

  configureFlags = [
    (lib.enableFeature withIntrospection "introspection")
    (lib.enableFeature withIntrospection "vala")

    "--enable-always-build-tests"
  ] ++ lib.optional stdenv.isDarwin "--disable-Bsymbolic"
    ++ lib.optional (stdenv.buildPlatform != stdenv.hostPlatform) "RUST_TARGET=${rust.toRustTarget stdenv.hostPlatform}";

  doCheck = false; # all tests fail on libtool-generated rsvg-convert not being able to find coreutils

  GDK_PIXBUF_QUERYLOADERS = writeScript "gdk-pixbuf-loader-loaders-wrapped" ''
    ${lib.optionalString (stdenv.hostPlatform.emulatorAvailable buildPackages) (stdenv.hostPlatform.emulator buildPackages)} ${lib.getDev gdk-pixbuf}/bin/gdk-pixbuf-query-loaders
  '';

  # librsvg only links Foundation, but it also requiers libobjc. The Framework.tbd in the 11.0 SDK
  # reexports libobjc, but the one in the 10.12 SDK does not, so link it manually.
  env = lib.optionalAttrs (stdenv.isDarwin && stdenv.isx86_64) {
    NIX_LDFLAGS = "-lobjc";
  };

  preConfigure = ''
    PKG_CONFIG_VAPIGEN_VAPIGEN="$(type -p vapigen)"
    export PKG_CONFIG_VAPIGEN_VAPIGEN
  '';

  # It wants to add loaders and update the loaders.cache in gdk-pixbuf
  # Patching the Makefiles to it creates rsvg specific loaders and the
  # relevant loader.cache here.
  # The loaders.cache can be used by setting GDK_PIXBUF_MODULE_FILE to
  # point to this file in a wrapper.
  postConfigure = ''
    GDK_PIXBUF=$out/lib/gdk-pixbuf-2.0/2.10.0
    mkdir -p $GDK_PIXBUF/loaders
    sed -i gdk-pixbuf-loader/Makefile \
      -e "s#gdk_pixbuf_moduledir = .*#gdk_pixbuf_moduledir = $GDK_PIXBUF/loaders#" \
      -e "s#gdk_pixbuf_cache_file = .*#gdk_pixbuf_cache_file = $GDK_PIXBUF/loaders.cache#" \
      -e "s#\$(GDK_PIXBUF_QUERYLOADERS)#GDK_PIXBUF_MODULEDIR=$GDK_PIXBUF/loaders \$(GDK_PIXBUF_QUERYLOADERS)#"

    # Fix thumbnailer path
    sed -e "s#@bindir@\(/gdk-pixbuf-thumbnailer\)#${gdk-pixbuf}/bin\1#g" \
        -i gdk-pixbuf-loader/librsvg.thumbnailer.in

    # 'error: linker `cc` not found' when cross-compiling
    export RUSTFLAGS="-Clinker=$CC"
  '' + lib.optionalString ((stdenv.buildPlatform != stdenv.hostPlatform) && (stdenv.hostPlatform.emulatorAvailable buildPackages)) ''
    # the replacement is the native conditional
    substituteInPlace gdk-pixbuf-loader/Makefile \
      --replace 'RUN_QUERY_LOADER_TEST = false' 'RUN_QUERY_LOADER_TEST = test -z "$(DESTDIR)"' \
  '';

  # Not generated when cross compiling.
  postInstall = let emulator = stdenv.hostPlatform.emulator buildPackages; in
    lib.optionalString (stdenv.hostPlatform.emulatorAvailable buildPackages) ''
      # Merge gdkpixbuf and librsvg loaders
      cat ${lib.getLib gdk-pixbuf}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache $GDK_PIXBUF/loaders.cache > $GDK_PIXBUF/loaders.cache.tmp
      mv $GDK_PIXBUF/loaders.cache.tmp $GDK_PIXBUF/loaders.cache

      installShellCompletion --cmd rsvg-convert \
        --bash <(${emulator} $out/bin/rsvg-convert --completion bash) \
        --fish <(${emulator} $out/bin/rsvg-convert --completion fish) \
        --zsh <(${emulator} $out/bin/rsvg-convert --completion zsh)
    '';

  postFixup = lib.optionalString withIntrospection ''
    # Cannot be in postInstall, otherwise _multioutDocs hook in preFixup will move right back.
    moveToOutput "share/doc" "$devdoc"
  '';

  passthru = {
    updateScript =
      let
        updateSource = gnome.updateScript {
          packageName = "librsvg";
        };

        updateLockfile = {
          command = [
            "sh"
            "-c"
            ''
              PATH=${lib.makeBinPath [
                common-updater-scripts
                jq
                nix
              ]}
              # update-source-version does not allow updating to the same version so we need to clear it temporarily.
              # Get the current version so that we can restore it later.
              latestVersion=$(nix-instantiate --eval -A librsvg.version | jq --raw-output)
              # Clear the version. Provide hash so that we do not need to do pointless TOFU.
              # Needs to be a fake SRI hash that is non-zero, since u-s-v uses zero as a placeholder.
              # Also cannot be here verbatim or u-s-v would be confused what to replace.
              update-source-version librsvg 0 "sha256-${lib.fixedWidthString 44 "B" "="}" --source-key=cargoDeps > /dev/null
              update-source-version librsvg "$latestVersion" --source-key=cargoDeps > /dev/null
            ''
          ];
          # Experimental feature: do not copy!
          supportedFeatures = [ "silent" ];
        };
      in
      _experimental-update-script-combinators.sequence [
        updateSource
        updateLockfile
      ];
    tests = {
      inherit
        gegl
        gimp
        imagemagick
        imlib2
        vips;
      inherit (enlightenment) efl;
      inherit (xfce) xfwm4;
      ffmpeg = ffmpeg.override { withSvg = true; };
    };
  };

  meta = with lib; {
    description = "A small library to render SVG images to Cairo surfaces";
    homepage = "https://wiki.gnome.org/Projects/LibRsvg";
    license = licenses.lgpl2Plus;
    maintainers = teams.gnome.members;
    mainProgram = "rsvg-convert";
    platforms = platforms.unix;
  };
})