os/modules/audio/default.nix

{ lib, config, pkgs, ... }:
with lib;
let
  psCfg = config.pub-solar;
  cfg = config.pub-solar.audio;
  xdg = config.home-manager.users."${psCfg.user.name}".xdg;
in
{
  options.pub-solar.audio = {
    enable = mkEnableOption "Life in highs and lows";
    mopidy.enable = mkEnableOption "Life with mopidy";
    spotify.enable = mkEnableOption "Life in DRM";
    spotify.username = mkOption {
      description = "Spotify login username or email";
      type = types.str;
      example = "yourname@example.com";
      default = "";
    };
    bluetooth.enable = mkEnableOption "Life with bluetooth";
  };

  config = mkIf cfg.enable {
    users.users = pkgs.lib.setAttrByPath [ psCfg.user.name ] {
      extraGroups = [ "audio" ];
    };

    home-manager = with pkgs; pkgs.lib.setAttrByPath [ "users" psCfg.user.name ] {
      home.packages = [
        # easyeffects, e.g. for microphone noise filtering
        easyeffects
        mu
        pavucontrol
        pa_applet
        playerctl
        # Needed for pactl cmd, until pw-cli is more mature (vol up/down hotkeys?)
        pulseaudio
        vimpc
      ] ++ (if cfg.spotify.enable then [ pkgs.spotify-tui ] else [ ]);
      xdg.configFile."vimpc/vimpcrc".source = ./.config/vimpc/vimpcrc;
      systemd.user.services.easyeffects = import ./easyeffects.service.nix pkgs;

      services.spotifyd = mkIf cfg.spotify.enable {
        enable = true;
        settings = {
          global = {
            username = cfg.spotify.username;
            password_cmd = "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1001/bus ${pkgs.libsecret}/bin/secret-tool lookup spotify password";
            bitrate = 320;
            volume_normalisation = true;
            no_audio_cache = false;
            max_cache_size = 1000000000;
          };
        };
      };
    };

    # Enable sound using pipewire-pulse
    services.pipewire = {
      enable = true;
      alsa.enable = true;
      alsa.support32Bit = true;
      pulse.enable = true;

      config.pipewire = {
        context.default.clock = {
          allowed-rates = [ 44100 48000 88200 96000 ];
          rate = 44100;
        };
      };
      config.pipewire-pulse = builtins.fromJSON (builtins.readFile ./pipewire-pulse.conf.json);
    };

    # Bluetooth configuration using wireplumber
    # https://nixos.wiki/wiki/PipeWire#Bluetooth_Configuration
    environment.etc = mkIf cfg.bluetooth.enable {
      "wireplumber/bluetooth.lua.d/51-bluez-config.lua".text = ''
        bluez_monitor.properties = {
          ["bluez5.enable-sbc-xq"] = true,
          ["bluez5.enable-msbc"] = true,
          ["bluez5.enable-hw-volume"] = true,
          ["bluez5.headset-roles"] = "[ hsp_hs hsp_ag hfp_hf hfp_ag ]"
        }
      '';
    };

    # Enable bluetooth
    hardware.bluetooth.enable = mkIf cfg.bluetooth.enable true;
    services.blueman.enable = mkIf cfg.bluetooth.enable true;

    # Enable audio server & client
    services.mopidy = mkIf cfg.mopidy.enable ((import ./mopidy.nix) pkgs);
  };
}