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

with pkgs;
with lib;

let
  cfg = config.services.mopidy;

  mopidyEnv = buildEnv {
    name = "mopidy-with-extensions-${mopidy.version}";
    paths = closePropagation cfg.extensionPackages;
    pathsToLink = [ "/${mopidyPackages.python.sitePackages}" ];
    buildInputs = [ makeWrapper ];
    postBuild = ''
      makeWrapper ${mopidy}/bin/mopidy $out/bin/mopidy \
        --prefix PYTHONPATH : $out/${mopidyPackages.python.sitePackages}
    '';
  };
in
{
  options = {
    services.mopidy = {
      enable = mkEnableOption "Mopidy, a music player daemon";

      extensionPackages = mkOption {
        default = [ ];
        type = types.listOf types.package;
        example = literalExpression "[ pkgs.mopidy-spotify ]";
        description = ''
          Mopidy extensions that should be loaded by the service.
        '';
      };

      settings = mkOption {
        default = { };
        type = with types; attrsOf (attrsOf (oneOf [ str int bool ]));
        description = ''
          The settings that Mopidy should use.
        '';
      };
    };
  };

  config = mkIf cfg.enable {
    xdg.configFile."mopidy/mopidy.conf".text = lib.generators.toINI { } cfg.settings;

    home.packages = [ mopidyEnv ];

    systemd.user.services.mopidy = {
      Unit = {
        Description = "mopidy music player daemon";
        After = [ "network.target" "sound.target" ];
      };
      Install = { WantedBy = [ "graphical-session.target" ]; };
      Service = {
        ExecStart = "${mopidyEnv}/bin/mopidy";
      };
    };
  };
}