{ lib, stdenv, fetchFromGitHub
, pkg-config, cmake, autoconf, automake, libtool, makeWrapper
, wget, xxd, desktop-file-utils, file
, gnupg, glib, zlib, cairo, openssl, fuse, xz, squashfuse, inotify-tools, libarchive
, squashfsTools
, gtest
}:

let

  appimagekit_src = fetchFromGitHub {
    owner = "AppImage";
    repo = "AppImageKit";
    rev = "b0859501df61cde198b54a317c03b41dbafc98b1";
    sha256 = "0qqg79jw9w9rs8c2w3lla4kz62ihafrf7jm370pp1dl8y2i81jzg";
  };

  # squashfuse adapted to nix from cmake experession in "${appimagekit_src}/cmake/dependencies.cmake"
  appimagekit_squashfuse = squashfuse.overrideAttrs (attrs: rec {
    name = "squashfuse-${version}";
    version = "20161009";

    src = fetchFromGitHub {
      owner = "vasi";
      repo  = "squashfuse";
      rev   = "1f980303b89c779eabfd0a0fdd36d6a7a311bf92";
      sha256 = "0lrw9ff8k15l34wjwyllw3i35hl0cms97jj2hpnr2q8ipgxpb5q5";
    };

    patches = [
      "${appimagekit_src}/squashfuse.patch"
      "${appimagekit_src}/squashfuse_dlopen.patch"
    ];

    postPatch = ''
      cp -v ${appimagekit_src}/squashfuse_dlopen.[hc] .
    '';

    preConfigure = ''
      sed -i "/PKG_CHECK_MODULES.*/,/,:./d" configure
      sed -i "s/typedef off_t sqfs_off_t/typedef int64_t sqfs_off_t/g" common.h
    '';

    configureFlags = [
      "--disable-demo" "--disable-high-level" "--without-lzo" "--without-lz4"
    ];

    postConfigure = ''
      sed -i "s|XZ_LIBS = -llzma |XZ_LIBS = -Bstatic -llzma/|g" Makefile
    '';

    # only static libs and header files
    installPhase = ''
      mkdir -p $out/lib $out/include
      cp -v ./.libs/*.a $out/lib
      cp -v ./*.h $out/include
    '';
  });

in stdenv.mkDerivation rec {
  name = "appimagekit-20180727";

  src = appimagekit_src;

  patches = [ ./nix.patch ];

  nativeBuildInputs = [
    pkg-config cmake autoconf automake libtool wget xxd
    desktop-file-utils
  ];

  buildInputs = [
    glib zlib cairo openssl fuse
    xz inotify-tools libarchive
    squashfsTools makeWrapper
  ];

  postPatch = ''
    substituteInPlace src/appimagetool.c --replace "/usr/bin/file" "${file}/bin/file"
  '';

  preConfigure = ''
    export HOME=$(pwd)
  '';

  cmakeFlags = [
    "-DUSE_SYSTEM_XZ=ON"
    "-DUSE_SYSTEM_SQUASHFUSE=ON"
    "-DSQUASHFUSE=${appimagekit_squashfuse}"
    "-DUSE_SYSTEM_INOTIFY_TOOLS=ON"
    "-DUSE_SYSTEM_LIBARCHIVE=ON"
    "-DUSE_SYSTEM_GTEST=ON"
    "-DUSE_SYSTEM_MKSQUASHFS=ON"
  ];

  postInstall = ''
    cp "${squashfsTools}/bin/mksquashfs" "$out/lib/appimagekit/"
    cp "${desktop-file-utils}/bin/desktop-file-validate" "$out/bin"

    wrapProgram "$out/bin/appimagetool" \
      --prefix PATH : "${lib.makeBinPath [ file gnupg ]}"
  '';

  checkInputs = [ gtest ];
  doCheck = false; # fails 1 out of 4 tests, I'm too lazy to debug why

  # for debugging
  passthru = {
    squashfuse = appimagekit_squashfuse;
  };

  meta = with lib; {
    description = "A tool to package desktop applications as AppImages";
    longDescription = ''
      AppImageKit is an implementation of the AppImage format that
      provides tools such as appimagetool and appimaged for handling
      AppImages.
    '';
    license = licenses.mit;
    homepage = src.meta.homepage;
    platforms = platforms.linux;
  };
}