{ pkgs ? import <nixpkgs> {}, mode ? "shell" }:

with pkgs.lib;

let

modes = {
  shell = "exec zsh";
  test  = "npm test";
  run   = "exec bin/hubot";
  runTg = ''
    telegram-cli \
      -dWE                \
      -Z $HUBOT_TG_SCRIPT \
      -P $HUBOT_TG_PORT   > /dev/null 2>&1 &
    bin/hubot -a tg
    pkill -9 telegram-wo-key; exit
  '';
};

telegram = pkgs.telegram-cli.override {
  python = pkgs.python3;
};

in pkgs.stdenv.mkDerivation rec {
  name = "asjon-dev";
  source = ".";

  buildInputs = node ++ external;
  node = with pkgs.nodePackages; [
    pkgs.nodejs
    mocha
    coffee-script
  ];
  external = with pkgs; [
    zsh
    telegram
    graphicsmagick
  ];

  shellHook = environment + getAttr mode modes;
  environment = ''
    #set env variables here
    export HUBOT_TG_SCRIPT=node_modules/hubot-tg/hubot.py
    export HUBOT_TG_PORT=1123
    export ADMIN_ROOM=user#123456
  '';
}