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

with lib;

let
  mkReservations = net: concatLists (mapAttrsToList
    (_: node: optional (hasAttr net node.config.hpc.dhcp.reservations) {
      "hw-address" = node.config.hpc.dhcp.reservations.${net}.hwAddress;
      "ip-address" = node.config.hpc.dhcp.reservations.${net}.ipAddress;
    })
    nodes);

in
{
  services.kea = {
    dhcp4 = {
      enable = true;
      settings = {
        "valid-lifetime" = 4000;
        "renew-timer" = 1000;
        "rebind-timer" = 2000;

        "interfaces-config" = {
          "interfaces" = [ "mngt" "data" ];
        };

        "lease-database" = {
          "type" = "memfile";
          "persist" = true;
          "name" = "/var/lib/kea/dhcp4.leases";
        };

        "subnet4" = [
          {
            "subnet" = "10.32.46.0/24";
            "interface" = "mngt";

            "option-data" = [
              {
                "name" = "routers";
                "data" = config.networking.defaultGateway.address;
              }
              {
                "name" = "domain-name-servers";
                "data" = "10.0.0.53,10.1.1.10";
              }
              {
                "name" = "domain-name";
                "data" = "mngt.${config.networking.domain}";
              }
              {
                "name" = "domain-search";
                "data" = "mngt.${config.networking.domain}";
              }
            ];

            "pools" = [
              {
                "pool" = "10.32.46.100-10.32.46.200";
              }
            ];

            "reservations" = mkReservations "mngt";
          }

          {
            "subnet" = "10.32.47.0/24";
            "interface" = "data";

            "option-data" = [
              {
                "name" = "domain-name-servers";
                "data" = "10.0.0.53,10.1.1.10";
              }
              {
                "name" = "domain-name";
                "data" = config.networking.domain;
              }
              {
                "name" = "domain-search";
                "data" = config.networking.domain;
              }
            ];

            "pools" = [
              {
                "pool" = "10.32.47.100-10.32.47.200";
              }
            ];

            "reservations" = mkReservations "data";
          }
        ];
      };
    };
  };
}