{ stable ? import <nixos-stable>,
  unstable ? import <nixos-unstable>,
  gitpkgs ? import /nixpkgs/default.nix,
  config, lib, pkgs, ... }:

with lib;

let
  optPkgs = package: pkgstring: if elem pkgstring config.machine.pkgs then package else [];
  gitpkgs = import /nixpkgs/default.nix {};

  # Programms I'm likely to want on every machine and/or may execute as root
  base = with pkgs; [
    alsaUtils
    ccze
    cksfv
    cryptsetup
    dhcpcd
    dnsutils
    git
    gnupg
    gptfdisk
    home-manager
    htop
    hwinfo
    indent
    iptables
    lrzip
    lsof
    lshw
    macchanger
    mkpasswd
    netcat
    nix-index
    nix-plugins
    nix-prefetch-git
    nix-serve
    nix-update-source
    nix-zsh-completions
    nixbang
    nixops
    nmap
    nox
    ntfs3g
    oh-my-zsh
    openssl
    parted
    p7zip
    pciutils
    psmisc
    rfkill
    ripgrep
    rsync
    sl
    sysvtools
    telnet
    traceroute
    tree
    unrar
    unzipNLS
    usbutils
    vim
    vulnix
    wget
    whois
    wirelesstools
    wpa_supplicant
    zip
    zlib
    zsh
  ];

  dict = with pkgs; [
    translate-shell
    ( hunspellWithDicts (with pkgs.hunspellDicts; [ de-de en-us ] ))
    ( aspellWithDicts   (d: [ d.de d.en d.en-computers d.en-science ] ))
  ];

  emacs = gitpkgs.emacsWithPackages (epkgs: with epkgs; [
    /* Theming */
    solarized-theme color-theme-sanityinc-tomorrow moe-theme powerline moody minions
    /*General Stuff */
    rainbow-delimiters # color parenthesis by indentation
    color-identifiers-mode
    /* Python */
    company-jedi pylint melpaStablePackages.elpy
    /* Git support */
    magit
    emms # multimedia support
    wsd-mode
    plantuml-mode
    /* Other Stuff, not yet sorted */
    google-translate
    transmission
    org-plus-contrib orgit ox-gfm ox-rst
    easy-jekyll markdown-mode impatient-mode simple-httpd htmlize
    eclim
    auto-complete
    pkgs.aspell pkgs.aspellDicts.en pkgs.aspellDicts.de
    use-package diminish bind-key
    smartparens
    evil-surround evil-indent-textobject evil-cleverparens avy undo-tree
    cdlatex #  for math expressions
    helm
    /* LaTeX */ auctex helm-bibtex cdlatex
    markdown-mode
    flycheck
    pkgs.ledger
    yaml-mode
    company
    /* C/C++ */ irony company-irony  company-irony-c-headers flycheck-irony clang-format
    /* Haskell */ haskell-mode flycheck-haskell
    /* Org */ org org-ref pdf-tools org-bullets org-caldav
    /* Rust */ rust-mode flycheck-rust racer
    /* mail */ messages-are-flowing
    /* Nix */ nix-buffer nix-mode nixos-options company-nixos-options nix-sandbox
    paganini-theme
    spaceline # modeline beautification
    winum eyebrowse # window management
    auto-compile
    /* Maxima */ pkgs.maxima
    visual-fill-column
    web-mode
    melpaStablePackages.idris-mode helm-idris
  ]);

  extra = with pkgs; [
    transmission
    texlive.combined.scheme-full
  ];
  
  mailutils = with pkgs; [
    fetchmail
    imagemagick
    isync
    mu-git
    pandoc
    postfix
  ];

  cpp = with pkgs; [
    clang
    cmake
    gcc
    global
    irony-server
  ];

  haskell = pkgs.haskellPackages.ghcWithPackages (pkgs: with pkgs; [
    mtl
    random
  ]);

  java = with pkgs; [
    openjdk11
    (with pkgs.eclipses; eclipseWithPlugins {
      eclipse = eclipse-platform;
      jvmArgs = [ "-Xmx2048m" ];
      plugins = [ 
        plugins.color-theme
        plugins.emacsplus
        plugins.checkstyle 
      ];
    })
  ];

  python3 = gitpkgs.python3Full.withPackages(ps: with ps; [
    GitPython
    bpython
    configparser
    django
    elpy
    emoji
    epc
    genanki
    numpy
    opencv3
    paho-mqtt
    pep8
    pillow
    pip
    plotly
    pyflakes
    pylama
    pylint
    pyopengl
    pyproj
    requests
    schedule
    scipy
    selenium
    telegram
    tkinter
    toolz
    virtualenv
#    flask
#    flask-common
#    flask-compress
#    flask-cors
#    flask-limiter
#    flask-pymongo      
#    flask-restful
#    flask-restplus     
#    flask_assets
#    flask_elastic
#    flask_login
#    flask_mail
#    flask_marshmallow
#    flask_migrate
#    flask_oauthlib     
#    flask_principal
#    flask_script
#    flask_sqlalchemy
#    flask_testing    
#    flask_wtf
#    flaskbabel   
    /* temporarily fix python stuff */
    py3status pytz tzlocal
  ]);

  rustpkgs = with pkgs; [ 
    rustup
    carnix
    rustracer
  ];

  server = with pkgs; [
    audit
    letsencrypt
    php
    simp_le
  ];

  uniProgs = with pkgs; [
    qucs
  ];

  xpkgs = with pkgs; [
    feh
    scrot
    theme_flat-remix
    theme_sddm_midnight
    gnome3.dconf
    gnome3.gnome-terminal
    gnome3.gvfs
    gvfs
    pcmanfm lxmenu-data shared_mime_info
    pavucontrol
    xclip
    xlibs.xkill
    xorg.xbacklight
    xdiskusage
  ];

in {
  environment.systemPackages =  base
                            ++ (optPkgs dict "dict")
                            ++ (optPkgs [emacs] "emacs")
                            ++ (optPkgs extra "extra")
                            ++ (optPkgs mailutils "mailutils")
                            ++ (optPkgs cpp "cpp")
                            ++ (optPkgs [haskell] "haskell")
                            ++ (optPkgs java "java")
                            ++ (optPkgs [python3] "python3")
                            ++ (optPkgs rustpkgs "rustpkgs")
                            ++ (optPkgs server "server")
                            ++ (optPkgs uniProgs "uniProgs")
                            ++ (optPkgs xpkgs "xpkgs");

  services.emacs = {
    enable = (elem "emacs" config.machine.pkgs);
    install = (elem "emacs" config.machine.pkgs);
    package = emacs;
  };
}