{ config, pkgs, pkgs-unstable, ... }:
{
  system.activationScripts.ciscoPreHook = {
    text = ''
      echo "Prefetching Cisco Packet Tracer dependencies..."
      ${pkgs.nix}/bin/nix-prefetch-url --type sha256 file:///etc/nixos/local-pkgs/CiscoPacketTracer_900_Ubuntu_64bit.deb
    '';
    deps = [];
  };

  # Enable nix flakes
  nix.settings = {
    experimental-features = ["nix-command" "flakes" ];
    trusted-users = [ "root" "someone" ];
  };
  environment.pathsToLink = [ "/share/applications" "/share/xdg-desktop-portal" ];

  # Set your time zone.
  time.timeZone = "Europe/Berlin";

  # Select internationalisation properties.
  console.keyMap = "de";
  i18n.defaultLocale = "en_GB.UTF-8";
  i18n.extraLocaleSettings = {
    LC_ADDRESS = "de_DE.UTF-8";
    LC_IDENTIFICATION = "de_DE.UTF-8";
    LC_MEASUREMENT = "de_DE.UTF-8";
    LC_MONETARY = "de_DE.UTF-8";
    LC_NAME = "de_DE.UTF-8";
    LC_NUMERIC = "de_DE.UTF-8";
    LC_PAPER = "de_DE.UTF-8";
    LC_TELEPHONE = "de_DE.UTF-8";
    LC_TIME = "de_DE.UTF-8";
  };

  networking = {
    networkmanager.enable = true;
  };

  powerManagement.enable = true;
  services.power-profiles-daemon.enable = true;
  # Suspend first then hibernate when closing the lid
  services.logind.settings.Login.lidSwitch = "suspend-then-hibernate";
  # Hibernate on power button pressed
  services.logind.settings.Login.powerKey = "hibernate";
  services.logind.settings.Login.powerKeyLongPress = "poweroff";

  # Hibernation
  boot.resumeDevice = "/dev/disk/by-label/swap";
  # resume offset from: filefrag -v /swapfile # under 0. physical offset
  boot.kernelParams = ["mem_sleep_default=freeze" "resume_offset=0" ];


  # Define time delay for hibernation
  systemd.sleep.settings.Sleep = {
    HibernateDelaySec = "30m";
    SuspendState = "mem";
  };

  programs.wireshark = {
    enable = true;
    usbmon.enable = true; # Allow USB monitoring
    dumpcap.enable = true; # Allow network capture
  };

  # Add zsh
  programs.zsh = {
    enable = true;
    enableCompletion = true;
    autosuggestions.enable = true;
    syntaxHighlighting.enable = true;

    shellAliases = {
      ll = "ls -l";
    };
  };

  programs.git = {
    enable = true;
    lfs.enable = true;
  };

  # Allow dynamicly linked executables
  programs.nix-ld.enable = true;

  # Libvirt
  programs.virt-manager.enable = true;

  virtualisation.libvirtd = {
    enable = true;
    qemu = {
      package = pkgs.qemu_kvm;
      runAsRoot = true;
      swtpm.enable = true;
    };
  };
  virtualisation.spiceUSBRedirection.enable = true;
  systemd.tmpfiles.rules = [ "L+ /var/lib/qemu/firmware - - - - ${pkgs.qemu}/share/qemu/firmware" ];

  # printing
  # Enable CUPS to print documents.
  services.printing = {
    enable = true;
    drivers = [ pkgs.cnijfilter2 ];
  };

  services.avahi = {
    enable = true;
    nssmdns4 = true;
    openFirewall = true;
  };

  fonts.packages = with pkgs; [
    liberation_ttf
    carlito
  ];

  nixpkgs.config.allowUnfree = true;

  environment.systemPackages = with pkgs; [
    # CLI
    starship
    fzf
    jq
    bc
    vim
    wget
    colordiff
    git

    # Nix / Lang
    nil
    nixd
    devenv
    rustup
    php

    # Web
    librewolf

    # Apps
    rnote
    logseq
    pdfarranger
    textpieces
    normcap
    nextcloud-client
    thunderbird
    libreoffice

    # Graphics
    gimp3
    virtiofsd
    ciscoPacketTracer9
    pkgs-unstable.zed-editor

    # Printing
    cnijfilter2 # canon printer

    # Net
    wireshark

    # Misc
    hunspell
    hunspellDicts.en_US
    hunspellDicts.de_DE
    docker-buildx
  ];
}