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{ config
, pkgs
, nixpkgs
, nixpkgs-unstable
, nixos-hardware
, ...
}: {
  imports = [
    (nixos-hardware + "/common/pc/ssd")
    (nixos-hardware + "/common/cpu/amd")

    ./settings/base.nix
    ./settings/configuration/berlin.nix
    ./settings/configuration/british-english.nix
    ./settings/configuration/nix.nix
    ./settings/configuration/user.nix
    ./settings/hardware/audio.nix
    ./settings/hardware/bare-metal.nix
    ./settings/hardware/personal-computer.nix
    ./settings/hardware/bluetooth.nix
    ./settings/hardware/iwd.nix
    ./settings/hardware/mouse.nix
    ./settings/hardware/systemd-boot.nix
    ./settings/hardware/nvidia-gpu.nix
    ./settings/hardware/keyboard.nix
    ./settings/hardware/keyboardio-model01.nix
    ./settings/hardware/trackball.nix
    ./settings/hardware/trezor.nix
    ./settings/services/samba.nix
    ./settings/services/syncthing.nix
    ./settings/services/zeroconf.nix
    ./settings/user-interface.nix
    ./settings/programs/base.nix
    ./settings/programs/gnupg.nix
    ./settings/programs/kde.nix
    ./settings/programs/shell.nix
    ./settings/gaming.nix
    ./settings/programs/tor.nix
    ./settings/programs/barrier.nix
  ];

  services.xserver.screenSection = ''
    Option "MetaModes" "2560x1440_165 +0+0 { ForceCompositionPipeline=On }"
  '';
  services.xserver.monitorSection = ''
    Option "DPMS"
  '';
  boot.loader.grub.useOSProber = false;
  boot.loader.grub.extraEntries = ''
    menuentry "Windows" {
      chainloader ($drive1)//EFI/Microsoft/Boot/bootmgfw.efi
    }
  '';

  boot.kernelPackages = pkgs.linuxPackages_zen;
  boot.extraModulePackages = with config.boot.kernelPackages; [
    zenpower
  ];

  boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "ahci" "usbhid" "sd_mod" ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ "kvm-amd" ];

  fileSystems = {
    "/" = {
      device = "/dev/disk/by-partlabel/nixos-root";
      fsType = "f2fs";
      options = [ "atgc" "gc_merge" "lazytime" "nodiscard" ];
    };

    "/boot" = {
      device = "/dev/disk/by-partlabel/efi-boot";
      fsType = "vfat";
    };

    "/home" = {
      device = "/dev/disk/by-partlabel/home";
      fsType = "ext4";
      options = [ "lazytime" "nodiscard" ];
    };

    "/mnt/data" = {
      device = "/dev/disk/by-partlabel/data";
      fsType = "ntfs3";
      options = [ "uid=1000" "gid=100" "x-systemd-automount" "nofail" ];
    };
  };

  swapDevices = [
    {
      label = "swap";
      discardPolicy = "once";
    }
  ];

  services.xserver = {
    xautolock.enable = pkgs.lib.mkForce false;
  };
  services.postgresql = {
    enableTCPIP = true;
    authentication = ''
      # TYPE  DATABASE        USER            ADDRESS                 METHOD
      host    all             all             samenet                 md5
    '';
  };

  services.openssh = {
    enable = true;
    openFirewall = false;
    startWhenNeeded = true;
  };
  systemd.services."ssh-no-sleep@" = {
    bindsTo = [ "sshd@%i.service" ];
    wantedBy = [ "sshd@.service" ];
    serviceConfig.ExecStart = "${pkgs.systemd}/bin/systemd-inhibit --mode block --what sleep --who 'ssh session '%I --why 'session still active' ${pkgs.coreutils}/bin/sleep infinity";
  };

  networking.nftables = {
    enable = true;
  };
  networking.firewall = {
    allowedTCPPorts = [ 80 443 139 445 1024 ];
    extraInputRules = ''
      ip saddr 172.30.42.0/24 accept
      ip6 saddr { fd00::/8, fe80::/10 } accept
    '';
  };

  hardware.firmware = with pkgs; [
    linux-firmware # for iwlwifi
  ];
  networking = {
    hostName = "prefect";
  };

  services.ddclient = {
    enable = true;
    package = (pkgs.ddclient.overrideAttrs
      (old: {
        patches = (old.patches or [ ]) ++ [
          ../patches/ddclient-noipv4.patch
        ];
      }));
    use = "no";
    protocol = "nsupdate";
    verbose = true;
    zone = "alanpearce.eu";
    server = "pappel.alanpearce.eu";
    passwordFile = "/etc/secrets/ddns.key";
    domains = [ "prefect.home.alanpearce.eu" ];
    extraConfig = ''
      usev4=disabled
      usev6=cmdv6
      cmdv6=${pkgs.writeScript "getipv6" ''
        #!/bin/sh
        set -eo pipefail
        ip --oneline address show dev enp7s0 to 2000::/3 primary \
          | awk '{ print $4 }' \
          | cut -d/ -f1
      ''}
      ttl=3600
    '';
  };
  systemd.services.ddclient.path = with pkgs;
    [
      iproute2
      coreutils
      gawk
    ];

  system.stateVersion = "23.05";
}