{ config, lib, pkgs, ... }:

with lib;
let
  cfg = config.modules.services.minecraft-server;
in
{
  options.modules.services.minecraft-server = {
    enable = mkEnableOption "";
    package = mkOption { type = types.package; default = pkgs.papermc; };
    openFirewall = mkOption {
      type = types.bool;
      default = false;
    };
    bedrockSupport = mkOption {
      type = types.bool;
      default = false;
    };
    eula = mkOption {
      type = types.bool;
      default = false;
    };
    dataDir = mkOption {
      type = types.str;
      default = "/var/lib/minecraft";
    };
  };

  config = mkIf cfg.enable {
    services.minecraft-server = {
      enable = true;
      package = cfg.package;
      declarative = false;
      eula = cfg.eula;
      dataDir = cfg.dataDir;
      jvmOpts = "-Xms4096M -Xmx4096M"
        + " -XX:+DisableExplicitGC -XX:+ParallelRefProcEnabled"
        + " -XX:+UnlockExperimentalVMOptions"
        + " -XX:+UseG1GC -XX:G1HeapRegionSize=8M -XX:G1HeapWastePercent=5"
        + " -XX:G1MaxNewSizePercent=40 -XX:G1NewSizePercent=30"
        + " -XX:G1MixedGCCountTarget=4 -XX:G1MixedGCLiveThresholdPercent=90"
        + " -XX:G1RSetUpdatingPauseTimePercent=5 -XX:G1ReservePercent=20"
        + " -XX:InitiatingHeapOccupancyPercent=15 -XX:MaxGCPauseMillis=200"
        + " -XX:MaxTenuringThreshold=1 -XX:SurvivorRatio=32";
    };

    modules.persistence.directories = [
      cfg.dataDir
    ];

  networking.firewall.allowedTCPPorts = [ 25565 ]
      ++ optionals (cfg.bedrockSupport) [ 19132 ];
  networking.firewall.allowedUDPPorts = [ 25565 ]
      ++ optionals (cfg.bedrockSupport) [ 19132 ];
  };
}