{ den, modules, ... }:
{
  modules.wivrn = {
      homeManager =
        { pkgs, ... }:
        {
          # nixpkgs builds wivrn with NVENC off (WIVRN_USE_NVENC follows cudaSupport);
          # without it "nvenc" in config.json fails with "Failed to find a suitable video encoder"
            nixpkgs.overlays = [
              (final: prev: {
                wivrn = prev.wivrn.override { cudaSupport = true; };
              })
            ];
          home.packages = with pkgs; [
            wivrn
            wayvr
          ];
        };

    nixos =
      { pkgs, lib, ... }:
      {
        # nixpkgs only enables the NVENC encoder (WIVRN_USE_NVENC) when cudaSupport is set;
        # without it "nvenc" in config.json fails with "Failed to find a suitable video encoder"
        nixpkgs.overlays = [
          (final: prev: {
        wivrn = prev.wivrn.override { cudaSupport = true; };
          })
        ];

        services.wivrn = {
          enable = true;
          openFirewall = true;
          autoStart = true;
          highPriority = true;

          # Low-latency encoder config
          extraServerFlags = [ ];

          monadoEnvironment = {
            # Monado OpenXR runtime env vars
          };

          steam = {
            enable = true;
            importOXRRuntimes = true;
          };

          # Optimal config for low latency:
          # - Vulkan encoder (newer kernels) or vaapi (AMD/Intel)
          # - H265 codec (3ms overhead, better quality than H264)
          # - 90Hz refresh rate (balance quality/battery)
          # - 140% render resolution with quality supersampling
          # - Up to 200Mbit/s bitrate on good networks
          config.enable = true;
          config.json = {
            encoder = {
              encoder = "nvenc";
              codec = "h265";
            };

            # Enable mDNS discovery
            "publish-service" = "avahi";

            # High priority for async reprojection
            highPriority = true;
          };
        };

        # Include monado-vulkan-layers for VR rendering
        environment.systemPackages = with pkgs; [
          monado-vulkan-layers
        ];
      };
  };
}