{ config, pkgs, ... }:

let
  my-python-packages = python-packages: with python-packages; [
    pip
    pipx
    python-dateutil
    setuptools
    requests
  ];
  python-with-my-packages = pkgs.python3Full.withPackages my-python-packages;
in
{
  nix = {
    settings = {
      experimental-features = [ "nix-command" "flakes" ];
      warn-dirty = false;
      auto-optimise-store = true;
      trusted-users = [ "root" "don" ];
    };
    gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than 7d";
    };
  };
  imports =
    [
      ./systemd.nix
      ./tailscale.nix
      ./upgrade-diff.nix
    ];

  networking.networkmanager.enable = true;
  networking.enableIPv6 = true;
  networking.useDHCP = false;

  time = {
    timeZone = "America/Chicago";
    hardwareClockInLocalTime = false;
  };

  i18n.defaultLocale = "en_US.utf8";

  boot = {
    kernelParams = [ "consoleblank=60" ];
    loader = {
      systemd-boot = {
        enable = true;
      };
      efi = {
        canTouchEfiVariables = true;
        efiSysMountPoint = "/boot";
      };
    };
    plymouth = {
      enable = true;
      theme = "breeze";
    };
    kernel = {
      sysctl = { "vm.swappiness" = 10;};
    };
  };

  security = {
    sudo.enable = false;
    doas = {
      enable = true;
      extraRules = [{
        users = [ "don" ];
        keepEnv = true;
        noPass = true;
      }];
    };
  };

  services = {
    pcscd = {
      enable = true;
    };
    udisks2 = {
      enable = true;
    };
    nscd = {
      enableNsncd = true;
    };
    tailscale = {
      enable = true;
    };
    locate = {
      enable = true;
      package = pkgs.mlocate;
      localuser = null;
    };
    openssh = {
      enable = true;
      settings = {
        PasswordAuthentication = false;
        KbdInteractiveAuthentication = false;
        PermitRootLogin = "yes";
      };
    };
  };

  security.rtkit.enable = true;

  users.users = {
    don = {
      isNormalUser = true;
      initialPassword = "changeme";
      description = "Don Harper";
      extraGroups = [ "networkmanager" "wheel" "scanner" "lp" "video" "mlocate" "disk" ];
      openssh.authorizedKeys.keys = [
        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINd8AdVbQQ/Fmw+b9mI8EMYqIoRkwmSwAOtmlte3incL don@loki"
      ];
    };
    root = {
      initialPassword = "changeme";
      openssh.authorizedKeys.keys = [
        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINd8AdVbQQ/Fmw+b9mI8EMYqIoRkwmSwAOtmlte3incL don@loki"
      ];
    };
  };

  #nixpkgs.config.allowUnfree = true;

  environment.systemPackages = with pkgs; [
    python-with-my-packages
    aspell
    aspellDicts.en
    bash-completion
    nix-bash-completions
    btop
    git-crypt
    gitFull
    home-manager
    hunspell
    hunspellDicts.en_US
    isync
    lsb-release
    pkg-config
    poppler_utils
    ruby
    udiskie
  ];

  programs = {
    dconf = {
      enable = true;
    };
    mtr = {
      enable = true;
    };
    gnupg = {
      agent = {
        enable = true;
        #pinentryFlavor = "curses";
        enableSSHSupport = true;
      };
    };
  };


  nixpkgs.overlays = [
    (final: super:{ khal        = super.khal.overridePythonAttrs (_: { doCheck = false; }); })
  ];

  # Open ports in the firewall.
  networking.firewall = {
    enable = false;
    trustedInterfaces = [ "tailscale0" ];
    checkReversePath = "loose";
    allowedUDPPorts = [ config.services.tailscale.port ];
    allowedTCPPorts = [ 22 ];
  };


  system.stateVersion = "23.11";
  programs.msmtp = {
    enable = true;
    accounts = {
      default = {
        auth = true;
        tls = true;
        port = 587;
        from = "duck@duckland.org";
        host = "smtp.gmail.com";
        user = "duckunix@gmail.com";
        passwordeval = "cat /home/don/.smtp_password.txt";
      };
    };
  };
}