{ nixpkgs ? import <nixpkgs> {}, compiler ? "default", doBenchmark ? false }:

let

  inherit (nixpkgs) pkgs;

  nanovgNeko = with haskellPackages; callPackage (
    { mkDerivation, base, bytestring, c2hs, containers, glew
    , hspec, inline-c, libGL, libGLU, QuickCheck, stdenv, text, vector
    }:
    mkDerivation {
      pname = "nanovg";
      version = "0.6.0.0";
      src = ../nanovg-hs;
      isLibrary = true;
      isExecutable = true;
      doCheck = false;
      libraryHaskellDepends = [ base bytestring containers text vector ];
      librarySystemDepends = [ glew libGL libGLU ];
      libraryPkgconfigDepends = [ glew ];
      libraryToolDepends = [ c2hs ];
      testHaskellDepends = [ base containers hspec inline-c QuickCheck ];
      homepage = "https://github.com/cocreature/nanovg-hs";
      description = "Haskell bindings for nanovg";
      license = stdenv.lib.licenses.isc;
    }) {};

  glib = with haskellPackages; callPackage(
    { mkDerivation, base, bytestring, Cabal, containers, glib
    , stdenv, text, utf8-string
    }:
    mkDerivation {
      pname = "glib";
      version = "0.13.6.0";
      sha256 = "4e71062c6a458440294d820e21449aa4666deed2ea233ef5915da7c1d4aee8eb";
      setupHaskellDepends = [ base Cabal gtk2hs-buildtools ];
      libraryHaskellDepends = [
        base bytestring containers text utf8-string
      ];
      libraryPkgconfigDepends = [ pkgs.glib ];
      homepage = "http://projects.haskell.org/gtk2hs/";
      description = "Binding to the GLIB library for Gtk2Hs";
      license = stdenv.lib.licenses.lgpl21;
    }) {};

  gtk2hs-buildtools = with haskellPackages; callPackage(
    { mkDerivation, alex, array, base, Cabal, containers, directory
    , filepath, happy, hashtables, pretty, process, random, stdenv
    }:
    mkDerivation {
      pname = "gtk2hs-buildtools";
      version = "0.13.4.0";
      src = ../gtk2hs/tools;
      isLibrary = true;
      isExecutable = true;
      enableSeparateDataOutput = true;
      libraryHaskellDepends = [
        array base Cabal containers directory filepath hashtables pretty
        process random
      ];
      libraryToolDepends = [ alex happy ];
      executableHaskellDepends = [ base ];
      homepage = "http://projects.haskell.org/gtk2hs/";
      description = "Tools to build the Gtk2Hs suite of User Interface libraries";
      license = stdenv.lib.licenses.gpl2;
    }) {};

  sdl2Nek0 = with haskellPackages; callPackage(
    { mkDerivation, base, bytestring, deepseq, exceptions, linear, SDL2
    , StateVar, stdenv, text, transformers, vector, weigh
    }:
    mkDerivation {
      pname = "sdl2";
      version = "2.4.1.0";
      sha256 = "21a569c0c19f8ff2bbe1cf1d3eb32f65e8143806de353cedd240df5e9d088b5c";
      isLibrary = true;
      isExecutable = true;
      enableSeparateDataOutput = true;
      libraryHaskellDepends = [
        base bytestring exceptions linear StateVar text transformers vector
      ];
      librarySystemDepends = [ SDL2 ];
      libraryPkgconfigDepends = [ SDL2 ];
      testHaskellDepends = [ base deepseq linear vector weigh ];
      doCheck = false;
      description = "Both high- and low-level bindings to the SDL library (version 2.0.4+).";
      license = stdenv.lib.licenses.bsd3;
    }) {};

  f = { mkDerivation, base, bytestring, clock, containers, deepseq
      , linear, matrix, monad-loops, monad-parallel, mtl
      , OpenGL, random, stdenv, stm, text, uuid, vector
      }:
      mkDerivation {
        pname = "affection";
        version = "0.0.0.9";
        src = ./.;
        configureFlags = [ "-fexamples" ];
        isLibrary = true;
        isExecutable = true;
        libraryHaskellDepends = [
          base bytestring clock containers glib linear monad-loops
          monad-parallel mtl OpenGL sdl2Nek0 stm text uuid vector
        ];
        executableHaskellDepends = [
          base containers deepseq linear matrix nanovgNeko OpenGL random sdl2Nek0 stm
        ];
        homepage = "https://github.com/nek0/affection#readme";
        description = "A simple Game Engine using SDL";
        license = stdenv.lib.licenses.lgpl3;
      };

  haskellPackages = if compiler == "default"
                       then pkgs.haskellPackages
                       else pkgs.haskell.packages.${compiler};

  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;

  drv = variant (haskellPackages.callPackage f {});

in

  if pkgs.lib.inNixShell then drv.env else drv