# ABOUTME: PipeWire and the RNNoise input denoising from the shared config.
# ABOUTME: Both halves in one place; they used to sit in two separate modules.

{ pkgs, moonarchSrc, ... }:

let
  xdg = "${moonarchSrc}/defaults/xdg";

  # PipeWire searches $PIPEWIRE_CONFIG_DIR, then $XDG_CONFIG_HOME/pipewire, then
  # its compiled-in /etc/pipewire — never /etc/xdg (verified in PipeWire's
  # src/pipewire/conf.c). The shared file therefore cannot be deployed the way
  # the other XDG configs are; it goes through the module's configPackages,
  # which is what its own option documentation shows for a conf.d file.
  #
  # The file names the plugin as `librnnoise_ladspa`, resolved through
  # LADSPA_PATH, which points at nothing here. Substituted to the
  # store path, the way modules/desktop.nix does it for the wallpaper. LADSPA
  # has no counterpart to services.pipewire.extraLv2Packages, so the path
  # belongs in the file.
  denoisingConfig = pkgs.runCommand "moonarch-pipewire-denoising" { } ''
    mkdir -p "$out/share/pipewire/pipewire.conf.d"
    substitute ${xdg}/pipewire/pipewire.conf.d/99-input-denoising.conf \
      "$out/share/pipewire/pipewire.conf.d/99-input-denoising.conf" \
      --replace-fail "plugin = librnnoise_ladspa" \
        "plugin = ${pkgs.rnnoise-plugin}/lib/ladspa/librnnoise_ladspa.so"
  '';
in
{
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    jack.enable = true;

    # RNNoise input denoising, from the shared config. The filter chain appears
    # as a separate "Noise Canceling source" input; it does not replace the raw
    # microphone, so applications have to select it.
    configPackages = [ denoisingConfig ];
  };

  # No pulseaudio for pactl: Steam probes wpctl and pactl both and takes
  # whichever is on PATH (nixpkgs#525793), and wireplumber puts wpctl there.
  # Its "pactl: command not found" is noise from Steam, not a gap.
  environment.systemPackages = with pkgs; [
    pavucontrol
    alsa-utils
  ];
}