# nixos-k8s implements nixos kubernetes testing runtime

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

with lib;
let
  testing = config.testing;
  # kubeconfig = "/etc/${config.services.kubernetes.pki.etcClusterAdminKubeconfig}";
  kubeconfig = "/etc/kubernetes/cluster-admin.kubeconfig";
  kubecerts = "/var/lib/kubernetes/secrets";

  # how we differ from the standard configuration of mkKubernetesBaseTest
  extraConfiguration = { config, pkgs, lib, nodes, ... }: {

    virtualisation = {
      memorySize = 2048;
    };

    networking = {
      nameservers = [ "10.0.0.254" ];
      firewall = {
        trustedInterfaces = [ "docker0" "cni0" ];
      };
    };

    services.kubernetes = {
      flannel.enable = false;
      kubelet = {
        seedDockerImages = testing.docker.images;
        networkPlugin = "cni";
        cni.config = [{
          name = "mynet";
          type = "bridge";
          bridge = "cni0";
          addIf = true;
          ipMasq = true;
          isGateway = true;
          ipam = {
            type = "host-local";
            subnet = "10.1.0.0/16";
            gateway = "10.1.0.1";
            routes = [{
              dst = "0.0.0.0/0";
            }];
          };
        }];
      };
    };

    systemd = {
      extraConfig = "DefaultLimitNOFILE=1048576";
      # Host tools should have a chance to access guest's kube api
      services.copy-certs = {
        description = "Share k8s certificates with host";
        script = "cp -rf ${kubecerts} /tmp/xchg/; cp -f ${kubeconfig} /tmp/xchg/;";
        after = [ "kubernetes.target" ];
        wantedBy = [ "multi-user.target" ];
        serviceConfig = {
          Type = "oneshot";
          RemainAfterExit = true;
        };
      };
    };

  };

  script = ''
    machine1.succeed("${testing.testScript} --kube-config=${kubeconfig}")
  '';

  test =
    with import "${pkgs.path}/nixos/tests/kubernetes/base.nix" { inherit pkgs; inherit (pkgs) system; };
    mkKubernetesSingleNodeTest {
      inherit extraConfiguration;
      inherit (config.testing) name;
      test = script;
    };


in
{
  options.testing.runtime.nixos-k8s = {
    driver = mkOption {
      description = "Test driver";
      type = types.package;
      internal = true;
    };
  };

  config.testing.runtime.nixos-k8s.driver = test.driver;
}