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

with lib;

let

  cfg = config.services.status-notifier-watcher;

in {
  meta.maintainers = [ maintainers.pltanton ];

  options = {
    services.status-notifier-watcher = {
      enable = mkEnableOption "Status Notifier Watcher";

      package = mkOption {
        default = pkgs.haskellPackages.status-notifier-item;
        defaultText =
          literalExample "pkgs.haskellPackages.status-notifier-item";
        type = types.package;
        example = literalExample "pkgs.haskellPackages.status-notifier-item";
        description =
          "The package to use for the status notifier watcher binary.";
      };
    };
  };

  config = mkIf cfg.enable {
    systemd.user.services.status-notifier-watcher = {
      Unit = {
        Description = "SNI watcher";
        After = [ "graphical-session-pre.target" ];
        PartOf = [ "graphical-session.target" ];
        Before = [ "taffybar.service" ];
      };

      Service = {
        ExecStart = "${cfg.package}/bin/status-notifier-watcher";
        # Delay the unit start a bit to allow the program to get fully
        # set up before letting dependent services start. This is
        # brittle and a better solution using, e.g., `BusName=` might
        # be possible.
        ExecStartPost = "${pkgs.coreutils}/bin/sleep 1";
      };

      Install = {
        WantedBy = [ "graphical-session.target" "taffybar.service" ];
      };
    };
  };
}