{
  pkgs,
  service_configs,
  lib,
  username,
  ...
}:
let
  heap_size = "4000M";
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_4;

      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;

      symlinks = {
        "mods" = pkgs.linkFarmFromDrvs "mods" (
          with pkgs;
          builtins.attrValues {
            FabricApi = fetchurl {
              url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/KEv54FjE/fabric-api-0.111.0%2B1.21.4.jar";
              sha512 = "ca6e1f0a6178f48b319891ca666ddaa186c094b6402e64e9d45e9f206d0985b0dbb00dfc833b14f26013463845ee1496356d4d8c0028eee4db9524e2cf2df618";
            };

            FerriteCore = fetchurl {
              url = "https://cdn.modrinth.com/data/uXXizFIs/versions/IPM0JlHd/ferritecore-7.1.1-fabric.jar";
              sha512 = "f41dc9e8b28327a1e29b14667cb42ae5e7e17bcfa4495260f6f851a80d4b08d98a30d5c52b110007ee325f02dac7431e3fad4560c6840af0bf347afad48c5aac";
            };

            Lithium = fetchurl {
              url = "https://cdn.modrinth.com/data/gvQqBUqZ/versions/t1FlWYl9/lithium-fabric-0.14.3%2Bmc1.21.4.jar";
              sha512 = "1a4eafbdcee3886d33c04aa462d13a8c1e345ff492001add262476585b78327a2d016e56385bced869615bc97161a34a0a716f5f579c8c1d7080b278f4f11183";
            };

            NoChatReports = fetchurl {
              url = "https://cdn.modrinth.com/data/qQyHxfxd/versions/9xt05630/NoChatReports-FABRIC-1.21.4-v2.11.0.jar";
              sha512 = "d343b05c8e50f1de15791ff622ad44eeca6cdcb21e960a267a17d71506c61ca79b1c824167779e44d778ca18dcbdebe594ff234fbe355b68d25cdb5b6afd6e4f";
            };

            moonrise = fetchurl {
              url = "https://cdn.modrinth.com/data/KOHu7RCS/versions/FZCC8uFL/Moonrise-Fabric-0.2.0-beta.6%2Bb70443e.jar";
              sha512 = "1574d3a0f81220ff1daacbda79ce889ac4120ebeb8ad51fdce11a27413603f9e5d37fdcfbb90f206b50559fa65aec68d515559cf91d223116e4f314aa69cf468";
            };

            squaremap = fetchurl {
              url = "https://jenkins.jpenilla.xyz/job/squaremap/lastSuccessfulBuild/artifact/build/libs/squaremap-fabric-mc1.21.4-1.3.4-SNAPSHOT+53d7948.jar";
              sha256 = "v1iCRTXvTLuxEy1hzbd9fVXmY62nqBAhFTEfdIu7sAk=";
            };
          }
        );
      };
    };
  };

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

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