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

let
  network = import ../../lib/network.nix;
  cfg = config.ptw.system.offloading.offload;
in {
  options.ptw.system.offloading.offload = {
    enable = lib.mkEnableOption "Allow offloading building of derivations";
  };

  config = lib.mkIf cfg.enable {
    nix = {
      distributedBuilds = true;
      buildMachines = [{
        hostName = "miku";
        systems = [ "x86_64-linux" "i686-linux" ];
        maxJobs = 4;
        speedFactor = 2;
        supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
      }];
    };

    programs.ssh.extraConfig = ''
Host miku
  HostName ${network.miku}
  User builder
  IdentitiesOnly yes
  IdentityFile /root/.ssh/id_builder
  '';
  };
}