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;
            };
          };
        };
      };

    # rtkit is optional but recommended
    security.rtkit.enable = true;
    # Enable sound using pipewire-pulse, default config:
    # https://gitlab.freedesktop.org/pipewire/pipewire/-/blob/master/src/daemon/pipewire.conf.in
    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;
          quantum = 2048;
          min-quantum = 1024;
          max-quantum = 4096;
        };
      };
      config.pipewire-pulse = builtins.fromJSON (builtins.readFile ./pipewire-pulse.conf.json);
    };

    # Make pulseaudio listen on port 4713 for mopidy, extending the default
    # config: https://gitlab.freedesktop.org/pipewire/pipewire/-/blob/master/src/daemon/pipewire-pulse.conf.in
    environment.etc = mkIf cfg.mopidy.enable {
      "pipewire/pipewire-pulse.conf.d/99-custom.conf".text = ''
        {
          "context.modules": [
            {
              "name": "libpipewire-module-protocol-pulse",
              "args": {
                "server.address": ["unix:native", "tcp:4713"],
                "vm.overrides": {
                  "pulse.min.quantum": "1024/48000"
                }
              }
            }
          ]
        }
      '';
    };

    # Enable bluetooth
    hardware.bluetooth = mkIf cfg.bluetooth.enable {
      enable = true;
      # Disable bluetooth on startup to save battery
      powerOnBoot = false;
      # Disable useless SIM Access Profile plugin
      disabledPlugins = [
        "sap"
      ];
      settings = {
        General = {
          # Enables experimental features and interfaces.
          # Makes BlueZ Battery Provider available
          Experimental = true;
        };
      };
    };
    services.blueman.enable = mkIf cfg.bluetooth.enable true;

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