{
  pkgs,
  service_configs,
  lib,
  ...
}:
let
  heap_size = "6144M";
in
{
  nixpkgs.config.allowUnfreePredicate =
    pkg:
    builtins.elem (lib.getName pkg) [
      "minecraft-server"
    ];

  users.groups.minecraft = {};

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

    servers.${service_configs.minecraft.server_name} = {
      enable = true;
      package = pkgs.fabricServers.fabric-1_21_1;

      # Aikar's flags
      jvmOpts = "-Xmx${heap_size} -Xms${heap_size} -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+ParallelRefProcEnabled -XX:+PerfDisableSharedMem -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:G1HeapWastePercent=5 -XX:G1MaxNewSizePercent=40 -XX:G1MixedGCCountTarget=4 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1NewSizePercent=30 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:G1ReservePercent=20 -XX:InitiatingHeapOccupancyPercent=15 -XX:MaxGCPauseMillis=200 -XX:MaxTenuringThreshold=1 -XX:SurvivorRatio=32";

      serverProperties = {
        server-port = service_configs.ports.minecraft;
        enforce-whitelist = true;
        gamemode = "survival";
        white-list = true;
        difficulty = "easy";
        motd = "A Minecraft Server";
      };

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

      symlinks = {
        "mods" = pkgs.linkFarmFromDrvs "mods" (
          builtins.attrValues {
            BadOptimizations = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/g96Z4WVZ/versions/XYBqWKD2/BadOptimizations-2.1.4-1.21.jar";
              sha512 = "6f12d5d7b75ed38f006e4c1e176a2308bf78e6bb5d49601152d7a8fa8e576b3e884bd04fcfb976b82fb67a62408e7efcff3ecc6844cea62b07d4b0538b9f0549";
            };
            ClothConfig = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/9s6osm5g/versions/HpMb5wGb/cloth-config-15.0.140-fabric.jar";
              sha512 = "1b3f5db4fc1d481704053db9837d530919374bf7518d7cede607360f0348c04fc6347a3a72ccfef355559e1f4aef0b650cd58e5ee79c73b12ff0fc2746797a00";
            };
            C2ME = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/VSNURh3q/versions/AHlC1pea/c2me-fabric-mc1.21.1-0.3.0%2Balpha.0.212.jar";
              sha512 = "a1977f3bb02a793677db0b0e20494af4bd648efd3b7e83d0c1ef3f14e7fdc0c4d3a9561b841fde97a123b87123275ce3c213bf414f91bc1393f26c95a70f0536";
            };
            FabricApi = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/WTaAx4ah/fabric-api-0.105.0%2B1.21.1.jar";
              sha512 = "6e1ffcf7f5af9589c16ccec1f9bb5ef8dede5ebe52ae09d94affa8050603f6ecd71d130a793c2bdb4bd42b2a70905425e55141d39369dfa9840569eef4dace16";
            };
            FerriteCore = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/uXXizFIs/versions/wmIZ4wP4/ferritecore-7.0.0-fabric.jar";
              sha512 = "0f2f9b5aebd71ef3064fc94df964296ac6ee8ea12221098b9df037bdcaaca7bccd473c981795f4d57ff3d49da3ef81f13a42566880b9f11dc64645e9c8ad5d4f";
            };
            Lithium = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/gvQqBUqZ/versions/9x0igjLz/lithium-fabric-mc1.21.1-0.13.1.jar";
              sha512 = "4250a630d43492da35c4c197ae43082186938fdcb42bafcb6ccad925b79f583abdfdc17ce792c6c6686883f7f109219baecb4906a65d524026d4e288bfbaf146";
            };
            NoChatReports = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/qQyHxfxd/versions/riMhCAII/NoChatReports-FABRIC-1.21-v2.8.0.jar";
              sha512 = "092837afc0fcb5208561062f8e4cd69971efa94c0180ae377e318d35d8f278abbf1552e4a577be882dc7e870f884779bc36caf808c8bc90bb05490f1e034ddb8";
            };
            noisium = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/KuNKN7d2/versions/4sGQgiu2/noisium-fabric-2.3.0%2Bmc1.21-1.21.1.jar";
              sha512 = "606ba78cf7f30d99e417c96aa042f600c1b626ed9c783919496d139de650013f1434fcf93545782e3889660322837ce6e85530d9e1a5cc20f9ad161357ede43e";
            };
            threadtweak = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/vSEH1ERy/versions/F4sjmsi3/threadtweak-fabric-0.1.5%2Bmc1.21.1.jar";
              sha512 = "b0221075239b9998d08e9a42d7bb3205c22482dc39f4b62a1c57c1f7444c9ec9cdee4a245b6b9c6b23f61f3cec82056c40cfc09e6c1bc0690cd936dfed6393a1";
            };
            vmp = pkgs.fetchurl {
              url = "https://cdn.modrinth.com/data/wnEe9KBa/versions/VuFHjBNh/vmp-fabric-mc1.21.1-0.2.0%2Bbeta.7.168-all.jar";
              sha512 = "5e2360e91a36d0e76ff0e805c504c773a1449252572ae218edf4430bdf179ac50b1a080d3ca25ecca266499b5637b5b92a228d1c6516e742a7c9f560791c4059";
            };
          }
        );
      };
    };
  };
}