# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page, on
# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).

{ pkgs, meta, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
    ];

  nix = {
    package = pkgs.nixFlakes;
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
  };

  # Use the systemd-boot EFI boot loader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  networking.hostName = meta.hostname; # Define your hostname.
  # Pick only one of the below networking options.
  networking.networkmanager.enable = true;
  networking.interfaces.enp1s0.ipv4.addresses = [
    {
      address = (
        if meta.hostname == "homelab-0" then "192.168.18.10"
        else if meta.hostname == "homelab-1" then "192.168.18.11"
        else if meta.hostname == "homelab-2" then "192.168.18.12"
        else throw "Unknown hostname"
      );
      prefixLength = 24;
    }
  ];
  networking.defaultGateway = "192.168.18.1";
  networking.nameservers = [
    "192.168.18.250"
    "1.1.1.1"
  ];

  # Set your time zone.
  time.timeZone = "Asia/Karachi";

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

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";
  console = {
    font = "Lat2-Terminus16";
    keyMap = "us";
    #useXkbConfig = true; # use xkb.options in tty.
  };

  # Fixes for longhorn
  systemd.tmpfiles.rules = [
    "L+ /usr/local/bin - - - - /run/current-system/sw/bin/"
  ];
  virtualisation.docker.logDriver = "json-file";

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

  # Configure keymap in X11
  # services.xserver.xkb.layout = "us";
  # services.xserver.xkb.options = "eurosign:e,caps:escape";
  services.k3s = {
    enable = true;
    role = "server";
    tokenFile = /var/lib/rancher/k3s/server/token;
    extraFlags = toString ([
	    "--write-kubeconfig-mode \"0644\""
	    "--cluster-init"
	    "--disable servicelb"
	    "--disable traefik"
	    "--disable local-storage"
      "--tls-san homelab-0"
    ] ++ (if meta.hostname == "homelab-0" then [] else [
	      "--server https://192.168.18.10:6443"
    ]));
    clusterInit = (meta.hostname == "homelab-0");
  };

  services.openiscsi = {
    enable = true;
    name = "iqn.2016-04.com.open-iscsi:${meta.hostname}";
  };

  # Enable CUPS to print documents.
  # services.printing.enable = true;

  # Enable sound.
  # sound.enable = true;
  # hardware.pulseaudio.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.shahab = {
    isNormalUser = true;
    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
    packages = with pkgs; [
      tree
      cloudflared
    ];
    # Created using mkpasswd
    hashedPassword = "$6$.ZlYnf2cZph4tCbM$E/JJUDirRV8MZrgX4Rh.Pi1q95tev1ZxcKjPA1I.uURv56qoWcC39MJWO9S2T5MlkPVbSLGiM8Ihfz9mERImo/";
    openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGD/V4jLpuk7uAovkbHFr6uulfBKZmsH+BqmXIR2aYD0"
    ];
  };

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
     neovim
     k3s
     cifs-utils
     nfs-utils
     git
  ];

  # 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:

  # Enable the OpenSSH daemon.
  services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ 80 ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  networking.firewall.enable = false;

  networking.nat = {
    enable = true;
    externalInterface = "enp1s0";
    internalInterfaces = [ "wg0" ];
  };

  networking.wireguard = {
    enable = true;
    interfaces = {
      wg0 = {
        ips = [ "192.168.20.1/24" ];
        listenPort = 51820;
        privateKeyFile = "/etc/wireguard/private-key";

        # This allows the wireguard server to route your traffic to the internet and hence be like a VPN
        # For this to work you have to set the dnsserver IP of your router (or dnsserver of choice) in your clients
        postSetup = ''
          ${pkgs.iptables}/bin/iptables -t nat -A POSTROUTING -s 192.168.20.0/24 -o eth0 -j MASQUERADE
        '';

        # This undoes the above command
        postShutdown = ''
          ${pkgs.iptables}/bin/iptables -t nat -D POSTROUTING -s 192.168.20.0/24 -o eth0 -j MASQUERADE
        '';

        peers = [
          {
            name = "shahab";
            publicKey = "0KN9Z2HZlPEh6j399SygclxwOwKFyRfgyyLE75WJhH8=";
            allowedIPs = [ "192.168.20.2/32" ];
          }
        ];
      };
    };
  };

  # Copy the NixOS configuration file and link it from the resulting system
  # (/run/current-system/configuration.nix). This is useful in case you
  # accidentally delete configuration.nix.
  # system.copySystemConfiguration = true;

  # This option defines the first version of NixOS you have installed on this particular machine,
  # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.
  #
  # Most users should NEVER change this value after the initial install, for any reason,
  # even if you've upgraded your system to a new NixOS release.
  #
  # This value does NOT affect the Nixpkgs version your packages and OS are pulled from,
  # so changing it will NOT upgrade your system.
  #
  # This value being lower than the current NixOS release does NOT mean your system is
  # out of date, out of support, or vulnerable.
  #
  # Do NOT change this value unless you have manually inspected all the changes it would make to your configuration,
  # and migrated your data accordingly.
  #
  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
  system.stateVersion = "24.05"; # Did you read the comment?
}