{ config, lib, pkgs, pkgs-unstable, user, jovian-nixos, ... }:

let
  cfg = config.modules.gaming.steam-deck;
in {
  options.modules.gaming.steam-deck.enable = lib.mkEnableOption "steam-deck";
  config = lib.mkIf cfg.enable {
    imports = [
      (jovian-nixos + "/modules")
      home-manager.nixosModule
    ];

    jovian = {
      steam.enable = true;
      devices.steamdeck = {
        enable = true;
      };
    };

    services.xserver.displayManager.gdm.wayland = lib.mkForce true; # lib.mkForce is only required on my setup because I'm using some other NixOS configs that conflict with this value
    services.xserver.displayManager.defaultSession = "steam-wayland";
    services.xserver.displayManager.autoLogin.enable = true;
    services.xserver.displayManager.autoLogin.user = ${user};

    # Enable GNOME
    sound.enable = true;
    services.xserver.desktopManager.gnome = {
      enable = true;
    };

    # Create user
    users.users.${user} = {
      isNormalUser = true;
    };

    systemd.services.gamescope-switcher = {
      wantedBy = [ "graphical.target" ];
      serviceConfig = {
        User = 1000;
        PAMName = "login";
        WorkingDirectory = "~";

        TTYPath = "/dev/tty7";
        TTYReset = "yes";
        TTYVHangup = "yes";
        TTYVTDisallocate = "yes";

        StandardInput = "tty-fail";
        StandardOutput = "journal";
        StandardError = "journal";

        UtmpIdentifier = "tty7";
        UtmpMode = "user";

        Restart = "always";
      };

      script = ''
        set-session () {
          mkdir -p ~/.local/state
          >~/.local/state/steamos-session-select echo "$1"
        }
        consume-session () {
          if [[ -e ~/.local/state/steamos-session-select ]]; then
            cat ~/.local/state/steamos-session-select
            rm ~/.local/state/steamos-session-select
          else58 closure
            echo "gamescope"
          fi
        }
        while :; do
          session=$(consume-session)
          case "$session" in
            plasma)
              dbus-run-session -- gnome-shell --display-server --wayland
              ;;
            gamescope)
              steam-session
              ;;
          esac
        done
      '';
    };

    environment.systemPackages = with pkgs; [
      gnome.gnome-terminal
      gnomeExtensions.dash-to-dock
      jupiter-dock-updater-bin
      steamdeck-firmware
    ];

    # GNOME settings through home-manager
    home-manager.users.${user} = {
      home.stateVersion = "22.11";
      dconf.settings = {
        # Enable on-screen keyboard
        "org/gnome/desktop/a11y/applications" = {
          screen-keyboard-enabled = true;
        };
        "org/gnome/shell" = {
          enabled-extensions = [
            "dash-to-dock@micxgx.gmail.com"
          ];
          favorite-apps = ["steam.desktop"];
        };
        # Dash to Dock settings for a better touch screen experience
        "org/gnome/shell/extensions/dash-to-dock" = {
          background-opacity = 0.80000000000000004;
          custom-theme-shrink = true;
          dash-max-icon-size = 48;
          dock-fixed = true;
          dock-position = "LEFT";
          extend-height = true;
          height-fraction = 0.60999999999999999;
          hot-keys = false;
          preferred-monitor = -2;
          preferred-monitor-by-connector = "eDP-1";
          scroll-to-focused-application = true;
          show-apps-at-top = true;
          show-mounts = true;
          show-show-apps-button = true;
          show-trash = false;
        };
      };
    };
}