{
    config,
    lib,
    ...
}: with lib; let
    cfg = config.myOptions.services.syncthing;
    username = config.myOptions.other.system.username;
    hmCfg = config.home-manager.users.${username};
in {
    options.myOptions.services.syncthing = {
        enable = mkEnableOption "enable syncthing";
        extraSettings = mkOption {
            type = types.attrs;
            description = "extra per host syncthing settings";
            default = {};
        };
    };

    # https://wes.today/nixos-syncthing/
    config = let
        port = 8384;
        homeDirectory = hmCfg.home.homeDirectory;
    in mkIf cfg.enable {
        services.syncthing = {
            enable = true;
            dataDir = homeDirectory;
            configDir = "${hmCfg.xdg.configHome}/syncthing";
            openDefaultPorts = true;
            user = username;
            group = "users";
            guiAddress = "0.0.0.0:${toString port}";
            overrideDevices = false;
            overrideFolders = false;
            # settings = {
            #     devices = {
            #         niks.id = "ZXGYWRF-THUTZFB-UUSUNFJ-6O4SP5X-WZH5DOJ-YC25NHH-EC55CIH-V7ZKFQG";
            #         # del.id = "";
            #         # chmura.id = "";
            #     };
            #     folders = {
            #         Projects = {
            #             path = "${homeDirectory}/Projects";
            #             devices = [ "niks" /*"del" "chmura"*/ ];
            #             versioning = {
            #                 type = "staggered";
            #                 params = {
            #                     cleanInterval = "3600";
            #                     maxAge = "15552000";
            #                 };
            #             };
            #         };
            #         Studia = {
            #             path = "${homeDirectory}/Studia";
            #             devices = [ "niks" /*"del" "chmura"*/ ];
            #             versioning = {
            #                 type = "staggered";
            #                 params = {
            #                     cleanInterval = "3600";
            #                     maxAge = "15552000";
            #                 };
            #             };
            #         };
            #         KeepassXC = {
            #             path = "${homeDirectory}/KeepassXC";
            #             devices = [ "niks" /*"del" "chmura"*/ ];
            #             versioning = {
            #                 type = "staggered";
            #                 params = {
            #                     cleanInterval = "3600";
            #                     maxAge = "15552000";
            #                 };
            #             };
            #         };
            #         Notes = {
            #             path = "${homeDirectory}/Notes";
            #             devices = [ "niks" /*"del" "chmura"*/ ];
            #             versioning = {
            #                 type = "staggered";
            #                 params = {
            #                     cleanInterval = "3600";
            #                     maxAge = "15552000";
            #                 };
            #             };
            #         };
            #         mieszkanie = {
            #             path = "${homeDirectory}/mieszkanie";
            #             devices = [ "niks" /*"del" "chmura"*/ ];
            #             versioning = {
            #                 type = "staggered";
            #                 params = {
            #                     cleanInterval = "3600";
            #                     maxAge = "15552000";
            #                 };
            #             };
            #         };
            #     };
            # } // cfg.extraSettings;
        };
        services.caddy = {
            virtualHosts."sync.jacekpoz.pl".extraConfig = ''
                reverse_proxy * localhost:${toString port}
            '';
        };
    };
}