{ pkgs, lib, config, ... }:
let
  cfg = config.services.minecraft-servers;
in
{
  config = {
    fileSystems = {
      "/srv/mcserver".options = [ "compress=zstd" "nofail" ];
      "/srv/mcserver/.snapshots".options = [ "compress=zstd" "nofail" ];
    };
    networking.firewall.trustedInterfaces = [ "wg0" ];

    users = {
      users = {
        nullbite.extraGroups = [ "minecraft" ];
      };
    };

    services.snapper = {
      configs.mcserver = {
        FSTYPE = "btrfs";
        SUBVOLUME = "/srv/mcserver";
        TIMELINE_CREATE = true;
        TIMELINE_CLEANUP = true;
        TIMELINE_MIN_AGE = "1800";
        TIMELINE_LIMIT_HOURLY = "36";
        TIMELINE_LIMIT_DAILY = "14";
        TIMELINE_LIMIT_WEEKLY = "4";
        TIMELINE_LIMIT_MONTHLY = "12";
        TIMELINE_LIMIT_YEARLY = "10000";
      };
    };

    services.minecraft-servers = {
      enable = true;
      eula = true;
      dataDir = "/srv/mcserver";
      servers = let
        notlite-modpack = let
          commit = "9e96ad3";
        in pkgs.fetchPackwizModpack {
          url = "https://gitea.protogen.io/nullbite/notlite/raw/commit/${commit}/pack.toml";
          packHash = "sha256-N3Pdlqte8OYz6wz3O/TSG75FMAV+XWAipqoXsYbcYDQ=";
        };

        # hack to make quilt work. requires manual installation.
        # workaround for nix-minecraft#60
        shimPackage = pkgs.writeShellScriptBin "minecraft-server" ''
          exec ${pkgs.jre_headless}/bin/java $@ -jar ./quilt-server-launch.jar nogui
        '';
      in {
        notlite = {
          useRecommendedDefaults = true;
          enable = true;
          autoStart = true;
          modpack = notlite-modpack;
          modpackSymlinks = [ "mods" ];
          modpackFiles = [ "config/" "kubejs/" ];
          serverProperties = {
            motd = "owo what's this (nix notlite edition)";
            server-port = 25567;
            "query.port" = 25567;

            # more declarative
            level-seed = "8555431723250870652";
            level-type = "bclib:normal";
          };

        };
        minecraft-nixtest = let
          self = cfg.servers.minecraft-nixtest;
          package = pkgs.quiltServers.quilt-1_20_1.override { loaderVersion = "0.21.0"; };
        in {
          useRecommendedDefaults = true;
          enable = false;
          modpack = notlite-modpack;
          # package = shimPackage;
          autoStart = self.enable;
          whitelist = {
            YzumThreeEye = "3dad78e8-6979-404f-820e-952ce20964a0";
            NullBite = "e24e8e0e-7540-4126-b737-90043155bcd4";
            Silveere = "468554f1-27cd-4ea1-9308-3dd14a9b1a12";
          };
          modpackSymlinks = [ "mods" ];
          modpackFiles = [ "config/" "kubejs/" ];
          serverProperties = rec {
            motd = "owo what's this (nix edition)";
            server-port = 25568;
            "query.port" = server-port;
          };
        };
      };
    };
  };
}