nix/modules/homelab/minecraft_recpro/default.nix

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

let
  service = "minecraft_recpro";
  cfg = config.modules.gameservers.${service};
  sec = config.sops.secrets;
  servers = {
    velocity = { data_dir = "/var/lib/gameservers/minecraft_recpro/velocity"; ram = "2G"; };
    smp = { data_dir = "/var/lib/gameservers/minecraft_recpro/smp"; ram = "12G"; };
    superflat = { data_dir = "/var/lib/gameservers/minecraft_recpro/superflat"; ram = "4G"; };
    bento = { data_dir = "/var/lib/gameservers/minecraft_recpro/bento"; ram = "2G"; };
  };
in
{
  options.modules.gameservers.${service} = {
    enable = lib.mkEnableOption "enables ${service}";
    url = lib.mkOption {
      type = lib.types.str;
      default = "mc.recoil.pro";
      description = "set domain for ${service}";
    };
    data_dir = lib.mkOption {
      type = lib.types.str;
      default = "/var/lib/gameservers/${service}";
      description = "set data directory for ${service}";
    };
    ids = lib.mkOption {
      type = lib.types.int;
      default = 25565;
      description = "set uid and pid of ${service} user (matches port by default)";
    };
    backup = lib.mkOption {
      type = lib.types.bool;
      default = false;
      description = "enable backups for ${service}";
    };
  };

  config = lib.mkIf cfg.enable {
    
    # declare ${service} group
    users.groups.minecraft = { gid = lib.mkForce cfg.ids; };

    # declare ${service} user
    users.users.minecraft = {
      description = "minecraft server user";
      uid = lib.mkForce cfg.ids;
      isSystemUser = true;
      shell = pkgs.bash;
      group = "minecraft";
      extraGroups = [];
    };

    systemd.tmpfiles.rules = lib.attrsets.mapAttrsToList (name: cfg:
      "d ${cfg.data_dir} 0770 minecraft minecraft -"
    ) servers;

    # Create a systemd service per server running in tmux
    systemd.services = lib.attrsets.mapAttrs (name: srv: {
      description = "minecraft_recpro: ${name}";
      after = [ "network.target" ];
      wants = [ "network.target" ];
      serviceConfig = {
        User = "minecraft";
        Group = "minecraft";
        WorkingDirectory = srv.data_dir;
        UMask = "0007";
        ExecStart = "${pkgs.openjdk21}/bin/java -Xmx${srv.ram} -jar server.jar nogui";
#        ExecStart = "${pkgs.tmux}/bin/tmux new-session -d -s mc-${name} '${pkgs.openjdk21}/bin/java -Xmx${srv.ram} -jar server.jar nogui'";
#        ExecStop = "${pkgs.tmux}/bin/tmux send-keys -t mc-${name} C-c";
        Restart = "on-failure";
        KillMode = "process";
      };
      wantedBy = [ "multi-user.target" ];
    }) servers;

    environment.systemPackages = with pkgs; [ openjdk21 mcrcon tmux ];

    services.mysql = {
      enable = true;
      package = pkgs.mariadb;
      ensureDatabases = [ "minecraft_recpro_db" ];
      ensureUsers = [
        {
          name = "minecraft";
          ensurePermissions = { "minecraft_recpro_db.*" = "ALL PRIVILEGES"; };
        }
      ];
      initialScript = pkgs.writeText "minecraft_recpro-init.sql" ''
        CREATE USER IF NOT EXISTS 'minecraft_recpro'@'localhost' IDENTIFIED BY 'IKNOWTHISISBADIJUSTNEEDTHISTOWORKRNPLS';
        GRANT ALL PRIVILEGES ON minecraft_recpro_db.* TO 'minecraft_recpro'@'localhost';
        FLUSH PRIVILEGES;
      '';
    };
    
    # open firewall
    networking.firewall.allowedTCPPorts = [ 25777 25565 25566 25567 ];

#    # internal reverse proxy entry
#    services.nginx.virtualHosts."${cfg.url}" = {
#      forceSSL = true;
#      sslCertificate = sec."ssl_blakedheld_crt".path;
#      sslCertificateKey = sec."ssl_blakedheld_key".path;
#      locations."/" = {
#        proxyPass = "http://127.0.0.1:${toString cfg.port}";
#      };
#    };
#     # external reverse proxy entry
#     services.nginx.virtualHosts."${service}.blakedheld.xyz" = {
#      forceSSL = true;
#      sslCertificate = sec."ssl_blakedheld_crt".path;
#      sslCertificateKey = sec."ssl_blakedheld_key".path;
#      locations."/" = {
#        proxyPass = "http://127.0.0.1:${toString cfg.port}";
#      };
#    };
#
    sops.secrets = {
      "velocity_forwarding" = {
        owner = "minecraft";
        group = "minecraft";
        path = "/var/lib/gameservers/minecraft_recpro/velocity/forwarding.secret";
        mode = "0400";
      };
      "minecraft_recpro_db_passwd" = {
        owner = "mysql";
        group = "mysql";
      };

    };

    # add to backups
    modules.system.backups.baks = lib.listToAttrs (
      lib.mapAttrsToList (srv_name: cfg:
        {
          name = srv_name;                     # attribute key
          value = { paths = [ cfg.data_dir ]; }; # attribute value
        }
      ) servers
    );
  };
}