# 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’).

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

{

  # Bootloader.
  boot.loader.systemd-boot.enable = true;
  boot.initrd.systemd.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  boot.supportedFilesystems = [ "zfs "];
  
  boot.initrd.systemd.services.rollback = {
    description = "Rollback ZFS root";
    wantedBy = [ "initrd.target" ];
    after = [ "zfs-import-zroot.service" ];
    before = [ "sysroot.mount" ];
    unitConfig.DefaultDependencies = "no";
    serviceConfig.Type = "oneshot";
    script = ''
      zfs rollback -r zroot/root@blank && echo "Rollback complete"
    '';
  };

  boot.kernelPackages = pkgs.linuxPackages;
  environment.persistence."/persist" = {
    enable = true;
    hideMounts = true;
    directories = [
      "/var/log"
      "/var/lib/bluetooth"
      "/var/lib/nixos"
      "/var/lib/libvirt"
      "/var/lib/ollama-models"
      "/var/lib/flatpak"
      "/var/lib/tailscale"
      "/etc/NetworkManager/system-connections"
      "/etc/ssh"
    ];
    files = [
      "/etc/machine-id"
    ];
  };

  fileSystems."/persist".neededForBoot = true;

  # Enable networking
  networking.networkmanager.enable = true;

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

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

  # Define a user account. Don't forget to set a password with ‘passwd’.
  programs.zsh.enable = true; # home-manager already installs this but nixos complains w/o it 
  users.users.xory = {
    isNormalUser = true;
    description = "xory";
    extraGroups = [ "networkmanager" "wheel" "docker" "libvirt" "dialout" ];
    shell = pkgs.zsh;
    initialHashedPassword = "$6$JXLpG5JYMJgZndm9$0sC8uPJ99cYL.hNv3DFQ20ky8tiZoxioe9GlMEanTwAD99LJ175/bHtN6Bm6bYsQG1BVGRdmphnXEcWS9ApoK0"; # this is defined declaratively, i don't use passwd.
  };
  
  # tailscale
  services.tailscale.enable = true;

  # nix-ld
  programs.nix-ld.enable = true;
  programs.nix-ld.libraries = with pkgs; [
    libGL
    SDL2
  ];

  # Firejail
  # TODO: add this back

  # Enable the KDE Plasma Desktop Environment.
  # I keep this enabled even if I main Hyprland because of QT.
  services.displayManager.sddm.enable = true;
  services.desktopManager.plasma6.enable = true;
  services.displayManager.defaultSession = "hyprland";

  # Enable Hyprland.
  programs.hyprland.enable = true;

  services.flatpak.enable = true;

  # Enable CUPS to print documents.
  services.printing.enable = true;
  services.printing.drivers = [ pkgs.hplip ];
  
  programs.gnupg.agent.enable = true;

  # Enable sound with pipewire.
  services.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    # If you want to use JACK applications, uncomment this
    #jack.enable = true;

    # 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;
  };

  hardware.bluetooth = {
    enable = true;
    powerOnBoot = true;
    settings = {
      General.Experimental = true;
      General.FastConnectable = true;
      Policy.AutoEnable = true;
    };
  };

  # AMDGPU stuff
  hardware.graphics = {
    enable = true;
    enable32Bit = true;
  };

  services.ollama.enable = true;
  services.ollama.models = "/var/lib/ollama-models";

  # Enable automatic login for the user.
  # We temporarily keep this enabled because I plan to switch to LVM on LUKS.
  services.displayManager.autoLogin.enable = true;
  services.displayManager.autoLogin.user = "xory";

  # Install firefox.
  programs.firefox.enable = true;

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

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
  #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
  #  wget
     neovim
     git
  ];

  programs.steam.enable = true;

  nix.gc = {
    automatic = true;
    dates = "weekly";
    options = "--delete-older-than 2d";
  };

  programs.virt-manager.enable = true;
  virtualisation.libvirtd = {
    enable = true;
    qemu = {
      vhostUserPackages = with pkgs; [ virtiofsd ];
      swtpm.enable = true;
    };
  };
  virtualisation.spiceUSBRedirection.enable = true;
  virtualisation.docker.enable = true;

  services = {
    syncthing = {
        enable = true;
        group = "users";
        user = "xory";
    };
  };
  services.openssh.enable = true; # TODO: add declarative key-based auth

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };

  # List services that you want to enable:

  # Open ports in the firewall.
  networking.firewall.allowedTCPPorts = [ 8000 8080 25565 ];
  networking.firewall.allowedUDPPorts = [ 8000 8080 ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;
  nix.settings.experimental-features = [ "nix-command" "flakes" ];


  # 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 = "25.05"; # Did you read the comment?

}