self: { config, lib, pkgs, ... }:
let
  cfg = config.services.stardew-tracker;
in
{
  options.services.stardew-tracker = {
    enable = lib.mkEnableOption "the shared Stardew Valley two-year tracker";
    package = lib.mkOption {
      type = lib.types.package;
      default = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
      defaultText = lib.literalExpression "stardew-tracker.packages.${pkgs.stdenv.hostPlatform.system}.default";
      description = "The stardew-tracker package to run.";
    };
    port = lib.mkOption {
      type = lib.types.port;
      default = 8089;
      description = "Loopback TCP port used by the tracker.";
    };
  };

  config = lib.mkIf cfg.enable {
    users.users.stardew-tracker = {
      isSystemUser = true;
      group = "stardew-tracker";
      description = "Stardew tracker service user";
    };
    users.groups.stardew-tracker = { };

    systemd.services.stardew-tracker = {
      description = "Shared Stardew Valley tracker";
      wantedBy = [ "multi-user.target" ];
      after = [ "network.target" ];
      serviceConfig = {
        ExecStart = "${cfg.package}/bin/stardew-tracker --host 127.0.0.1 --port ${toString cfg.port} --database /var/lib/stardew-tracker/progress.sqlite3";
        User = "stardew-tracker";
        Group = "stardew-tracker";
        StateDirectory = "stardew-tracker";
        Restart = "on-failure";
        RestartSec = 3;
        NoNewPrivileges = true;
        PrivateTmp = true;
        ProtectSystem = "strict";
        ProtectHome = true;
        ProtectKernelTunables = true;
        ProtectKernelModules = true;
        ProtectControlGroups = true;
        RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
      };
    };
  };
}