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

with lib;

let
  cfg = config.hscloud.base;

in {
  options.hscloud.base = {
    fqdn = mkOption {
      type = types.str;
      description = "Node's FQDN.";
      default = "${config.networking.hostName}.${config.networking.domain}";
    };
    mgmtIf = mkOption {
      type = types.str;
      description = "Main network interface. Called mgmtIf for legacy reasons.";
    };
    ipAddr = mkOption {
      type = types.str;
      description = "IPv4 address on main network interface.";
    };
    ipAddrBits = mkOption {
      type = types.int;
      description = "IPv4 CIDR mask bits.";
    };
    gw = mkOption {
      type = types.str;
      description = "IPv4 address of gateway.";
    };
  };

  # Override current nixos kubernetes with our vendored fork.
  # Also nuke flannel from orbit.
  disabledModules = [
    "services/cluster/kubernetes/apiserver.nix"
    "services/cluster/kubernetes/controller-manager.nix"
    "services/cluster/kubernetes/default.nix"
    "services/cluster/kubernetes/kubelet.nix"
    "services/cluster/kubernetes/pki.nix"
    "services/cluster/kubernetes/proxy.nix"
    "services/cluster/kubernetes/scheduler.nix"
    "services/cluster/kubernetes/flannel.nix"
  ];

  imports = [
    ./vendor/apiserver.nix
    ./vendor/controller-manager.nix
    ./vendor/default.nix
    ./vendor/kubelet.nix
    ./vendor/pki.nix
    ./vendor/proxy.nix
    ./vendor/scheduler.nix
  ];

  config = rec {
    boot.loader.grub.enable = true;
    boot.loader.grub.version = 2;
  
    fileSystems."/" =
      { # device = ""; needs to be defined
        fsType = "ext4";
      };
    swapDevices = [ ];
  
    boot.kernelPackages = pkgs.linuxPackages_latest;
    boot.kernelParams = [ "boot.shell_on_fail" ];
    boot.kernel.sysctl."net.ipv4.conf.all.rp_filter" = "0";
    boot.kernel.sysctl."net.ipv4.conf.default.rp_filter" = "0";
    boot.initrd.availableKernelModules = [ "uhci_hcd" "ehci_pci" "megaraid_sas" "usb_storage" "usbhid" "sd_mod" "sr_mod"  ];
    boot.initrd.kernelModules = [ "dm-raid" "dm-snapshot" ];
    boot.kernelModules = [ "kvm-intel" ];
    boot.extraModulePackages = [];
    hardware.enableRedistributableFirmware = true;
    hardware.cpu.intel.updateMicrocode = true;
    hardware.cpu.amd.updateMicrocode = true;

    environment.etc."lvm/lvm.conf".text = ''
      devices/issue_discards = 1
    '';
  
    time.timeZone = "Europe/Warsaw";
  
    environment.systemPackages = with pkgs; [
      wget vim htop tcpdump screen tmux smartmontools pciutils lm_sensors ipmitool
      rxvt_unicode.terminfo
    ];
    programs.mtr.enable = true;
  
    networking.useDHCP = false;
    networking.interfaces."${cfg.mgmtIf}" = {
      ipv4.addresses = [
        {
          address = cfg.ipAddr;
          prefixLength = cfg.ipAddrBits;
        }
      ];
    };
    networking.defaultGateway = cfg.gw;
    networking.nameservers = ["185.236.240.1"];
  
    # Instead of using nixpkgs from the root/nixos channel, use pkgs pin from this file.
    nix.nixPath = [ "nixpkgs=${pkgs.path}" "nixos-config=/etc/nixos/configuration.nix" ];
  
    # Otherwise fetchGit nixpkgs pin fails.
    systemd.services.nixos-upgrade.path = [ pkgs.git ];
  
    # Use Chrony instead of systemd-timesyncd
    services.chrony = {
      enable = true;
      # cockroach will refuse to start up at error>500ms, so let's just step
      # aggresively so it's correct ASAP
      initstepslew = {
        enabled = true;
        threshold = 1;
      };
      extraConfig = ''
        rtcfile /var/lib/chrony/rtc
        rtcautotrim 10
      '';
    };
  
    # Symlink lvm into /sbin/lvm on activation. This is needed by Rook OSD
    # instances running on Kubernetes.
    # See: https://github.com/rook/rook/commit/f3c4975e353e3ce3599c958ec6d2cae8ee8f6f61
    system.activationScripts.sbinlvm =
      ''
        mkdir -m 0755 -p /sbin
        ln -sfn ${pkgs.lvm2.bin}/bin/lvm /sbin/lvm
      '';
  
    # Enable the OpenSSH daemon.
    services.openssh.enable = true;

    # Enable fstrim, as we run / on SSDs everywhere.
    services.fstrim = {
      enable = true;
      interval = "daily";
    };

    users.users.root.openssh.authorizedKeys.keys = [
      "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDD4VJXAXEHEXZk2dxNwehneuJcEGkfXG/U7z4fO79vDVIENdedtXQUyLyhZJc5RTEfHhQj66FwIqzl7mzBHd9x9PuDp6QAYXrkVNMj48s6JXqZqBvF6H/weRqFMf4a2TZv+hG8D0kpvmLheCwWAVRls7Jofnp/My+yDd57GMdsbG/yFEf6WPMiOnA7hxdSJSVihCsCSw2p8PD4GhBe8CVt7xIuinhutjm9zYBjV78NT8acjDUfJh0B1ODTjs7nuW1CC4jybSe2j/OU3Yczj4AxRxBNWuFxUq+jBo9BfpbKLh+Tt7re+zBkaicM77KM/oV6943JJxgHNBBOsv9scZE7 q3k@amnesia"
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIG599UildOrAq+LIOQjKqtGMwjgjIxozI1jtQQRKHtCP q3k@mimeomia"
      "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDQb3YQoiYFZLKwvHYKbu1bMqzNeDCAszQhAe1+QI5SLDOotclyY/vFmOReZOsmyMFl71G2d7d+FbYNusUnNNjTxRYQ021tVc+RkMdLJaORRURmQfEFEKbai6QSFTwErXzuoIzyEPK0lbsQuGgqT9WaVnRzHJ2Q/4+qQbxAS34PuR5NqEkmn4G6LMo3OyJ5mwPkCj9lsqz4BcxRaMWFO3mNcwGDfSW+sqgc3E8N6LKrTpZq3ke7xacpQmcG5DU9VO+2QVPdltl9jWbs3gXjmF92YRNOuKPVfAOZBBsp8JOznfx8s9wDgs7RwPmDpjIAJEyoABqW5hlXfqRbTnfnMvuR informatic@InformaticPC"
      "ssh-rsa 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 patryk.jakuszew@gmail.com"
      "ssh-rsa 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 bartek@IHM"
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICTR292kx/2CNuWYIsZ6gykQ036aBGrmheIuZa6S1D2x implr@thonk"
    ];
  };
}