{ config, lib, pkgs, ... }:

{
  # Enable graphics driver support and 32-bit acceleration (for Steam/gaming)
  hardware.graphics = {
    enable = true;
    enable32Bit = true;
  };

  #OpenTabletDriver
  hardware.opentabletdriver.enable = true;
  hardware.uinput.enable = true;
  boot.kernelModules = [ "uinput" "v4l2loopback" ];

  # Virtual webcam device so ffmpeg (fed by the GoPro's stream) can appear
  # as a normal camera to apps like Discord. exclusive_caps=1 is required
  # for Chromium/WebRTC-based apps to recognize it as a real capture device.
  boot.extraModulePackages = [ config.boot.kernelPackages.v4l2loopback ];
  boot.extraModprobeConfig = ''
    options v4l2loopback devices=1 video_nr=10 card_label="GoPro Webcam" exclusive_caps=1
    # PS4/PS5 controllers (e.g. DualSense) connect over Bluetooth then
    # immediately disconnect — a well-known Linux Bluetooth stack issue
    # where many adapters' Enhanced Retransmission Mode implementation is
    # broken. Disabling ERTM is the standard, widely-documented fix.
    options bluetooth disable_ertm=1
  '';

  # I2C bus, for DDC/CI monitor control (brightness) via ddcutil, when
  # driving an external monitor over DisplayPort/HDMI. The internal panel
  # uses the kernel backlight class instead (brightness-ctl picks whichever
  # applies — see modules/scripts/brightness-ctl.sh).
  hardware.i2c.enable = true;

  # --- Hybrid graphics: AMD Radeon 680M (iGPU, drives the internal panel)
  # + NVIDIA RTX 4050 Max-Q (dGPU, offload-only) — ASUS TUF Gaming A15
  # FA507NU. Bus IDs come straight from `lspci` on this machine, not
  # guessed: 01:00.0 (NVIDIA) -> PCI:1:0:0, 35:00.0 (AMD) -> PCI:53:0:0.
  services.xserver.videoDrivers = [ "nvidia" ];

  hardware.nvidia = {
    # Required settings
    modesetting.enable = true;

    # Enable NVIDIA Open GPU Kernel Modules (Turing architecture or newer —
    # this RTX 4050 is Ada Lovelace, well within support)
    open = true;

    # Enable the NVIDIA settings menu
    nvidiaSettings = true;

    # Use the stable driver package matching current kernel
    package = config.boot.kernelPackages.nvidiaPackages.stable;

    # Fixes suspend/resume hangs that are common with NVIDIA on laptops.
    powerManagement.enable = true;

    # PRIME render offload: the AMD iGPU drives the display at all times
    # (much better battery life than keeping the dGPU powered on), and the
    # NVIDIA GPU is only spun up on demand for a specific process — run
    # anything with `nvidia-offload <command>` (generated by
    # enableOffloadCmd) to route it through the RTX 4050, e.g. games or
    # Blender's Cycles renderer.
    prime = {
      offload = {
        enable = true;
        enableOffloadCmd = true;
      };
      amdgpuBusId = "PCI:53:0:0";
      nvidiaBusId = "PCI:1:0:0";
    };
  };

  # ASUS laptop control: keyboard backlight/fan curves/battery charge limit
  # (asusctl) and dGPU power-state switching between Integrated/Hybrid modes
  # (supergfxctl) — the two standard asus-linux.org daemons for ROG/TUF
  # laptops, both packaged directly in nixpkgs.
  services.asusd.enable = true;
  services.supergfxd.enable = true;
}