# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ inputs, lib, config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix

      # NixCommunity binary cache
      ./cachix.nix
    ];

  # Enable flakes
  # Keep nix-shell from grabage collection for direnv (keep-outputs + keep-derivations)
  nix = {
    package = pkgs.nixFlakes;
    extraOptions = ''
      experimental-features = nix-command flakes

      keep-outputs = true
      keep-derivations = true
    '';

    # Auto garbage-collect and optimize store
    gc.automatic = true;
    gc.options = "--delete-older-than 5d";
    autoOptimiseStore = true;
    optimise.automatic = true;

    # TODO: Understand this
    # This will add your inputs as registries, making operations with them (such
    # as nix shell nixpkgs#name) consistent with your flake inputs.
    registry = lib.mapAttrs' (n: v: lib.nameValuePair n { flake = v; }) inputs;
  };

  # TODO: Understand that
  # Will activate home-manager profiles for each user upon login
  # This is useful when using ephemeral installations
  environment.loginShellInit = ''
    [ -d "$HOME/.nix-profile" ] || /nix/var/nix/profiles/per-user/$USER/home-manager/activate &> /dev/null
  '';

  # Bootloader/Kernel stuff
  boot = {
    kernelPackages = pkgs.linuxPackages_zen;
    kernelParams = [ "mitigations=off" ];

    loader.systemd-boot.enable = true;
    loader.systemd-boot.configurationLimit = 5;
    loader.systemd-boot.editor = false;
    loader.systemd-boot.consoleMode = "max";
    loader.efi.canTouchEfiVariables = true;
    loader.efi.efiSysMountPoint = "/boot/efi";

    # Make /tmp volatile
    tmpOnTmpfs = true;
  };

  hardware.cpu.intel.updateMicrocode = true;
  security.protectKernelImage = true;

  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  # Use all redistributable firmware (i.e. nonfree)
  hardware.enableAllFirmware = true;
  hardware.enableRedistributableFirmware = true;

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

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.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";
  };

  # TODO: Other ports (tcp/udp/ssh...)?
  # Open ports in the firewall.
  networking = {
    hostName = "nixinator"; # Define your hostname.
    # wireless.enable = true;  # Enables wireless support via wpa_supplicant.

    # Configure network proxy if necessary
    # proxy.default = "http://user:password@proxy:port/";
    # proxy.noProxy = "127.0.0.1,localhost,internal.domain";

    # Enable networking
    networkmanager.enable = true;

    firewall.allowedTCPPorts = [ ];
    firewall.allowedTCPPortRanges = [];

    firewall.allowedUDPPorts = [ ];
    firewall.allowedUDPPortRanges = [];

    # Or disable the firewall altogether.
    # firewall.enable = false;
  };

  # Enable the X11 windowing system.
  services.xserver = {
    enable = true;

    # Configure keymap in X11
    layout = "us";
    xkbVariant = "altgr-intl";

    # Proprietary graphics drivers
    # TODO: Opengl and stuff
    videoDrivers = ["nvidia"];
    # hardware.nvidia.modesetting.enable = true; # Not officially supported by NVidia # TODO: I don't think I need this for gnome

    # Startx replaces the displaymanager so default (lightdm) isn't used, start to shell
    # displayManager.startx.enable = true;

    # Plasma (X11)
    # displayManager.sddm.enable = true;
    # desktopManager.plasma5.enable = true;
    # desktopManager.plasma5.runUsingSystemd = true;

    # Gnome (Wayland)
    displayManager.gdm.enable = true;
    desktopManager.gnome.enable = true;
    # HomeManager gnome.gnome-keyring.enable = true;

    wacom.enable = true;
  };

  # Enable CUPS to print documents.
  # TODO: Printer driver
  services.printing.enable = true;
  services.avahi.enable = true; # Network printers
  services.avahi.nssmdns = true;
  hardware.sane.enable = true; # Scanning

  # Enable sound with pipewire.
  sound.enable = true;
  hardware.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    jack.enable = true; # We need this for low latency audio

    # use the example session manager (no others are packaged yet so this is enabled by default,
    # no need to redefine it in your config for now)
    #media-session.enable = true;
  };

  # Enable touchpad support (enabled default in most desktopManager).
  # services.xserver.libinput.enable = true;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.christoph = {
    isNormalUser = true;
    description = "Christoph";
    extraGroups = [ "networkmanager" "wheel" "audio" "realtime" "docker" "adbusers" "scanner" "lp" ];
    shell = pkgs.fish; # TODO: Is this needed if programs.fish.enable = true?
    # We do this with HomeManager
    packages = with pkgs; [ ];
  };

  # TODO: Trusted users

  # We want these packages to be available even when no user profile is active
  # Empty since we basically only need git + editor which is enabled below
  environment.systemPackages = with pkgs; [ ];

  # TODO: Identify all the crap
  # Remove these packages that come by default with GNOME
  environment.gnome.excludePackages = with pkgs.gnome; [
    epiphany
    gnome-maps
  ];

  # It is preferred to use the module (if it exists) over environment.systemPackages, as some extra configs are applied.
  # I would prefer to use HomeManager for some of these but the modules don't exist (yet)
  programs = {
    adb.enable = true;
    fish.enable = true;
    git.enable = true;
    neovim.enable = true;
    starship.enable = true;
    thefuck.enable = true; # Not available in HomeManager
  };

  # List services that you want to enable:
  services = {
    # Enable the OpenSSH daemon.
    openssh.enable = true;

    journald.extraConfig = ''
      SystemMaxUse=50M
    '';

    flatpak.enable = true; # Not quite the nix style but useful for bottles/proprietary stuff
    fstrim.enable = true;
    fwupd.enable = true;
    locate.enable = true; # Periodically update index
    ntp.enable = true;
  };

  # Docker
  virtualisation.docker = {
    enable = true;
    autoPrune.enable = true;
  };

  virtualisation.libvirtd = {
    enable = true;
  };

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "22.05"; # Did you read the comment?

}