{
  pkgs,
  service_configs,
  lib,
  username,
  ...
}:
let
  heap_size = "2000M";
in
{
  nixpkgs.config.allowUnfreePredicate =
    pkg:
    builtins.elem (lib.getName pkg) [
      "minecraft-server"
    ];

  services.minecraft-servers = {
    enable = true;
    eula = true;
    dataDir = service_configs.minecraft.parent_dir;
    openFirewall = true;

    servers.${service_configs.minecraft.server_name} = {
      enable = true;
      package = pkgs.fabricServers.fabric-1_21_3;

      jvmOpts = "-Xmx${heap_size} -Xms${heap_size} -XX:+UseZGC -XX:+ZGenerational";

      serverProperties = {
        server-port = 25565;
        enforce-whitelist = true;
        gamemode = "survival";
        white-list = true;
        difficulty = "easy";
        motd = "A Minecraft Server";
        view-distance = 12;
      };

      whitelist = import ../secrets/minecraft-whitelist.nix;

      # provide `infocmp` command for better-fabric-console
      path = [ pkgs.ncurses ];

      symlinks = {
        "mods" = pkgs.linkFarmFromDrvs "mods" (
          with pkgs;
          builtins.attrValues {
            FabricApi = fetchurl {
              url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/Xhw2LuSh/fabric-api-0.109.0%2B1.21.3.jar";
              sha512 = "decfcbcc4cc9748b9822a5e0b34dada9e1454bbf7c0eb1d4e014db243e8eebaa240a05a48c1bcde232ddecf150692fe295f9bb147794c861e42d2cad66119657";
            };

            FerriteCore = fetchurl {
              url = "https://cdn.modrinth.com/data/uXXizFIs/versions/a3QXXGz2/ferritecore-7.1.0-hotfix-fabric.jar";
              sha512 = "ae1ab30beb5938643cf2ae7b8220769f2c917e3f5441e46e9bc900295348c0a541a325c30b8dfc38039205620d872c27809acdc6741351f08e4c8edc36ae2bcc";
            };

            Lithium = fetchurl {
              url = "https://cdn.modrinth.com/data/gvQqBUqZ/versions/pZRO3EKX/lithium-fabric-0.14.3%2Bmc1.21.3.jar";
              sha512 = "31ad08427ac50dd54cd2215c29452bd20430ce13f2bd8f4bdb8a6e2f6222b83df47d5727edac721f9397fa296db2998f9aa3eabe2c4c5d45619f8b5b00cd21fc";
            };

            NoChatReports = fetchurl {
              url = "https://cdn.modrinth.com/data/qQyHxfxd/versions/Cg7X9iDa/NoChatReports-FABRIC-1.21.3-v2.10.1.jar";
              sha512 = "8f1163ad515ebdfab5ef54a4985af05e643749c2efc0bf7b62e00074bbe61d91789b0c9e558bbe1b5c5d21a89b88084ce6350a11a5a9a3bea59eea9764a27171";
            };

            moonrise = fetchurl {
              url = "https://cdn.modrinth.com/data/KOHu7RCS/versions/LMdPX7nZ/Moonrise-Fabric-0.2.0-beta.5%2Ba6cf977.jar";
              sha512 = "550474a8c2fd94c97d30ec3a03456b343db8467eff0807487d4fb84bb8f3be1b36720c70a86f0b364a448103519315fc6d7752a3df8cabf140f2af4f4a0b5851";
            };

            squaremap = fetchurl {
              url = "https://jenkins.jpenilla.xyz/job/squaremap/lastSuccessfulBuild/artifact/build/libs/squaremap-fabric-mc1.21.3-1.3.4-SNAPSHOT+4c8b7c6.jar";
              sha256 = "1rf1hy934zvkihm9hy99d17hh9v4lbwsxkzbf3zxj124lzbdmn79";
            };
          }
        );
      };
    };
  };

  systemd.tmpfiles.rules = [
    "d ${service_configs.minecraft.parent_dir}/${service_configs.minecraft.server_name} 0750 minecraft minecraft"
  ];

  users.users.${username}.extraGroups = [
    "minecraft"
  ];
}