{ stdenv, fetchSteam, writeText, SDL, mesa, jq, flavor ? "stable" }:

let
  renameAttrs = f: let
    rename = name: value: {
      name = f name;
      inherit value;
    };
  in stdenv.lib.mapAttrs' rename;

  darwinize = renameAttrs (bin: "Starbound.app/Contents/MacOS/${bin}");
  winize = renameAttrs (bin: "${bin}.exe");

  mkOsBinaryDeps = with stdenv.lib;
    if stdenv.system == "x86_64-darwin" then darwinize
    else if elem stdenv.system [ "i686-cygwin" "x86_64-cygwin" ] then winize
    else id;

  binaryDeps = mkOsBinaryDeps {
    starbound.deps = [ SDL mesa ];
    starbound_server.name = "starbound-server";
    asset_packer.name = "starbound-asset-packer";
    asset_unpacker.name = "starbound-asset-unpacker";
    dump_versioned_json.name = "starbound-dump-versioned-json";
    make_versioned_json.name = "starbound-make-versioned-json";
    planet_mapgen.name = "starbound-planet-mapgen";
  };

  binpath = if stdenv.system == "x86_64-linux" then "linux64"
            else if stdenv.system == "i686-linux" then "linux32"
            else if stdenv.system == "x86_64-darwin" then "osx"
            else if stdenv.system == "i686-cygwin" then "win32"
            else if stdenv.system == "x86_64-cygwin" then "win64"
            else throw "Unsupported system ${stdenv.system} for Starbound";

  upstreamInfo = if flavor == "stable" then {
    name = "starbound";
    version = "20151216";
    appId = 211820;
    depotId = 211821;
    manifestId = 1842730272313189605;
    sha256 = "0qppfn56c778wsg38hi6sxgi3rl9nv72h9rmmxybi1vzpf3p49py";
  } else if flavor == "unstable" then {
    name = "starbound-unstable";
    version = "20160223";
    appId = 367540;
    depotId = 367541;
    manifestId = 6970641909803280413;
    sha256 = "0qppfn56c778wsg38hi6sxgi3rl9nv72h9rmmxybi1vzpf3p49py";
  } else throw "Unsupported flavor, use either `stable' or `unstable'.";

  upstream = fetchSteam {
    inherit (upstreamInfo) name appId depotId manifestId sha256;
    fileList = [
      "^(?:assets|tiled)/"
      ( "^${binpath}(?:/Starbound\\.app/Contents/MacOS)?"
      + "/(?:[a-zA-Z0-9_-]+(?:\\.exe)?|sbboot\\.config)$")
    ];
  };

  bootOverrides = {
    storageDirectory = "$XDG_DATA_HOME/starbound";
    modSource = "$XDG_DATA_HOME/starbound/mods";
    assetSources = [
      "${upstream}/assets/packed.pak"
      "${upstream}/assets/user"
    ];
  };

  mkProg = bin: attrs: let
    basename = builtins.baseNameOf bin;

    hasBootconfigArg = attrs.hasBootconfigArg or false;

    bootconfigArgs = with stdenv.lib; let
      bootconfig = "$XDG_DATA_HOME/starbound/sbboot.config";
      logfile = "$XDG_DATA_HOME/starbound/starbound.log";
      args = " -bootconfig \"${bootconfig}\" -logfile \"${logfile}\"";
    in optionalString hasBootconfigArg args;

    wrapper = writeText "starbound-wrapper.sh" ''
      #!${stdenv.shell} -e
      [ -n "$XDG_DATA_HOME" ] || XDG_DATA_HOME="$HOME/.local/share"

      mkdir -p "${bootOverrides.storageDirectory}" \
               "${bootOverrides.modSource}"

      "${jq}/bin/jq" -s '.[0] * .[1]' \
        <(sed -e 's,//.*,,' "${upstream}/${binpath}/sbboot.config") \
        - > "$XDG_DATA_HOME/starbound/sbboot.config" \
      <<BOOTCONFIG_OVERRIDES
      ${builtins.toJSON bootOverrides}
      BOOTCONFIG_OVERRIDES

      ${stdenv.lib.optionalString hasBootconfigArg ''
        cd "$XDG_DATA_HOME/starbound"
      ''}
      exec "@out@/libexec/starbound/${basename}"${bootconfigArgs} "$@"
    '';

  in ''
    install -vD "patched/${basename}" "$out/libexec/starbound/${basename}"
    substituteAll "${wrapper}" "$out/bin/${attrs.name or basename}"
    chmod +x "$out/bin/${attrs.name or basename}"
  '';

in stdenv.mkDerivation {
  name = "${upstreamInfo.name}-${upstreamInfo.version}";
  inherit (upstreamInfo) version;

  unpackPhase = ":";

  inherit binpath upstream;

  buildPhase = with stdenv.lib; concatStrings (mapAttrsToList (bin: attrs: ''
    mkdir -p "patched/$(dirname "${bin}")"
    cp -t "patched/$(dirname "${bin}")" "$upstream/$binpath/${bin}"
    chmod +x "patched/$(basename "${bin}")"
    patchelf \
      --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
      --set-rpath "${stdenv.lib.makeLibraryPath (attrs.deps or [])}" \
      "patched/$(basename "${bin}")"
    if ldd "patched/$(basename "${bin}")" | grep -F 'not found'; then
      exit 1;
    fi
  '') binaryDeps);

  doCheck = true;

  checkPhase = ''
    checkFailed=
    for i in "$upstream/$binpath"/*; do
      [ -f "$i" ] || continue
      [ "$(basename "$i")" != sbboot.config ] || continue
      [ "$(basename "$i")" != launcher ] || continue
      [ ! -e "patched/$(basename "$i")" ] || continue

      echo "Found missing binary $i from the upstream tree."
      checkFailed=1
    done
    [ -z "$checkFailed" ]
  '';

  installPhase = ''
    mkdir -p "$out/bin"
    ${stdenv.lib.concatStrings (stdenv.lib.mapAttrsToList mkProg binaryDeps)}
  '';

  dontStrip = true;
}