{ inputs, desktop ? false, hostname, self }:
{ pkgs, ... }:
let
  configure-gtk = pkgs.writeTextFile {
    name = "configure-gtk";
    destination = "/bin/configure-gtk";
    executable = true;
    text = let
      schema = pkgs.gsettings-desktop-schemas;
      datadir = "${schema}/share/gsettings-schemas/${schema.name}";
    in ''
      export XDG_DATA_DIRS=${datadir}:$XDG_DATA_DIRS
      gnome_schema=org.gnome.desktop.interface
      gsettings set $gnome_schema gtk-theme 'Breeze Dark'
    '';
  };

  theme = import "${self}/lib/theme" { inherit pkgs; };

  username = "opdavies";
in {
  nixpkgs.config.allowUnfree = true;

  # Bootloader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  boot.loader.efi.efiSysMountPoint = "/boot/efi";

  systemd.extraConfig = ''
    DefaultTimeoutStopSec=10s
  '';

  networking.hostName = hostname;

  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.

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

  # Enable networking
  networking.networkmanager.enable = true;

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

  # 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";
  };

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

  services.xserver = {
    xkb = {
      layout = "gb";
      variant = "";
    };

    displayManager = {
      defaultSession = "none+i3";
      lightdm.enable = true;
    };

    windowManager.i3 = {
      enable = true;
      extraPackages = with pkgs; [ i3status i3lock i3blocks ];
    };
  };

  # Configure console keymap
  console.keyMap = "uk";

  services.avahi.enable = true;
  services.avahi.nssmdns4 = true;
  services.avahi.openFirewall = true;
  services.printing.enable = true;

  # Enable sound with pipewire.
  sound.enable = true;
  hardware.pulseaudio.enable = true;
  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;
  # };

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

  users.users.${username} = {
    isNormalUser = true;
    description = "Oliver Davies";
    extraGroups = [ "docker" "networkmanager" "wheel" ];
    packages = with pkgs; [ ];
  };

  security.sudo.wheelNeedsPassword = false;

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs;
    [
      brightnessctl
      configure-gtk
      ffmpegthumbnailer
      shotwell
      xfce.thunar
      xfce.thunar-volman
      xfce.tumbler
    ] ++ pkgs.lib.optionals desktop [
      acpi
      arandr
      dunst
      libnotify
      obsidian
      pocket-casts
      rclone
      rclone-browser
      spotify
      teams-for-linux
      todoist-electron

      # Games.
      zeroad
    ];

  # 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 = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # 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 = "22.11"; # Did you read the comment?

  virtualisation.docker = {
    enable = true;

    autoPrune = {
      enable = true;
      dates = "weekly";
    };
  };

  programs.zsh.enable = true;
  programs.zsh.histSize = 5000;

  users.defaultUserShell = "/etc/profiles/per-user/${username}/bin/zsh";

  fonts = {
    fontconfig = {
      enable = true;
      defaultFonts = { monospace = [ "JetBrainsMono Nerd Font Mono" ]; };
    };

    packages = with pkgs;
      [
        (nerdfonts.override {
          fonts = [
            "AnonymousPro"
            "FiraCode"
            "GeistMono"
            "IntelOneMono"
            "Iosevka"
            "JetBrainsMono"
          ];
        })
      ] ++ [ theme.fonts.monospace.package ];
  };

  zramSwap.enable = true;

  nix = {
    gc = {
      automatic = true;
      dates = "daily";
      options = "--delete-older-than 7d";
    };

    optimise.automatic = true;

    settings = {
      auto-optimise-store = true;
      experimental-features = [ "nix-command" "flakes" ];
      warn-dirty = false;
    };
  };

  # Make Caps lock work as an Escape key on press and Ctrl on hold.
  services.interception-tools = let
    dfkConfig = pkgs.writeText "dual-function-keys.yaml" ''
      MAPPINGS:
        - KEY: KEY_CAPSLOCK
          TAP: KEY_ESC
          HOLD: KEY_LEFTCTRL
    '';
  in {
    enable = true;
    plugins =
      pkgs.lib.mkForce [ pkgs.interception-tools-plugins.dual-function-keys ];
    udevmonConfig = ''
      - JOB: "${pkgs.interception-tools}/bin/intercept -g $DEVNODE | ${pkgs.interception-tools-plugins.dual-function-keys}/bin/dual-function-keys -c ${dfkConfig} | ${pkgs.interception-tools}/bin/uinput -d $DEVNODE"
        DEVICE:
          NAME: "AT Translated Set 2 keyboard"
          EVENTS:
            EV_KEY: [[KEY_CAPSLOCK, KEY_ESC, KEY_LEFTCTRL]]
    '';
  };

  system.autoUpgrade = {
    enable = true;
    flake = inputs.self.outPath;
    flags = [
      "--update-input"
      "nixpkgs"
      "--no-write-lock-file"
      "-L" # print build logs
    ];
    dates = "08:00";
    randomizedDelaySec = "45min";
  };

  services.gvfs.enable = true;

  programs.gnupg.agent = {
    enable = true;
    enableSSHSupport = true;
    pinentryPackage = pkgs.pinentry-qt;
  };

  programs.firefox = {
    enable = true;
    languagePacks = [ "en-GB" ];
    preferences = {
      "intl.accept_languages" = "en-GB, en";
      "intl.regional_prefs.use_os_locales" = true;
    };
  };

  services.blueman.enable = true;

  services.cron = {
    enable = true;

    systemCronJobs =
      [ "* * * * * opdavies /home/opdavies/.config/bin/notify-battery.sh" ];
  };

  services.auto-cpufreq.enable = true;

  services.udev = {
    enable = true;
    extraRules = ''
      KERNEL=="hidraw*", SUBSYSTEM=="hidraw", MODE="0660", GROUP="users", TAG+="uaccess", TAG+="udev-acl"
    '';
  };
}