{
    config,
    lib,
    ...
}: let
    cfg = config.myOptions.services.syncthing;
    inherit (config.myOptions.other.system) username;
    hmCfg = config.home-manager.users.${username};
    configDir = config.home-manager.users.${username}.xdg.configHome;

    inherit (lib) mkEnableOption mkIf mkOption;
    inherit (lib.types) attrs;
in {
    options.myOptions.services.syncthing = {
        enable = mkEnableOption "syncthing";
        extraSettings = mkOption {
            type = attrs;
            description = "extra per host syncthing settings";
            default = {};
        };
    };

    # https://wes.today/nixos-syncthing/
    config = let
        port = 8384;
        inherit (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 = "2YJLRJI-PB3OKLI-KJZGMYQ-RH5OVCS-LQAXBUT-IX2Q5TO-K24NBNS-33YQIQL";
                    del.id = "NZUKCEW-QYCXDGY-62LOMIH-47JUSD5-VXAVUTF-VG356GJ-ZHQCF3S-2PDIHAX";
                    chmura.id = "TJCCHXS-HA5ZXUI-NKXWICR-4ADPHCA-TVRNDBN-54E622Z-TUAAVOM-YIJHWAI";
                };
                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 = "${homeDirectory}/mieszkanie";
                        devices = [ "niks" "del" "chmura" ];
                        versioning = {
                            type = "staggered";
                            params = {
                                cleanInterval = "3600";
                                maxAge = "15552000";
                            };
                        };
                    };
                    PrismLauncher = {
                        path = "${hmCfg.xdg.dataHome}/PrismLauncher";
                        devices = [ "niks" "del" "chmura" ];
                        versioning = {
                            type = "staggered";
                            params = {
                                cleanInterval = "3600";
                                maxAge = "15552000";
                            };
                        };
                    };
                    jacekpoz = {
                        path = "${homeDirectory}/jacekpoz";
                        devices = [ "niks" "del" "chmura" ];
                        versioning = {
                            type = "staggered";
                            params = {
                                cleanInterval = "3600";
                                maxAge = "15552000";
                            };
                        };
                    };
                    OsuStable = {
                        path = "${homeDirectory}/.osu";
                        devices = [ "niks" "del" "chmura" ];
                        versioning = {
                            type = "staggered";
                            params = {
                                cleanInterval = "3600";
                                maxAge = "15552000";
                            };
                        };
                    };
                    Cool = {
                        path = "${homeDirectory}/Cool";
                        devices = [ "niks" "del" "chmura" ];
                        versioning = {
                            type = "staggered";
                            params = {
                                cleanInterval = "3600";
                                maxAge = "15552000";
                            };
                        };
                    };
                    RimWorld = {
                        path = "${configDir}/unity3d/Ludeon Studios/RimWorld by Ludeon Studios";
                        devices = [ "niks" "del" "chmura" ];
                        versioning = {
                            type = "staggered";
                            params = {
                                cleanInterval = "3600";
                                maxAge = "15552000";
                            };
                        };
                    };
                };
            } // cfg.extraSettings;
        };
        services.caddy = mkIf (username == "chmura") {
            virtualHosts."sync.jacekpoz.pl".extraConfig = ''
                reverse_proxy * localhost:${toString port}
            '';
        };
    };
}