args@{ lib, dns, ... }:

let
  inherit (lib.extra)
    mapSingleFuse
    mkRel
    recursiveFuse;

  delegations = {
    "dgnum.eu" = {
      "ns-01.hubrecht.ovh." = [ "51.15.174.50" ];
      "ns-03.hubrecht.ovh." = [ "51.178.27.125" ];
      "kurisu.dual.lahfa.xyz." = [ ];
    };
  };

  servedZones = [
    "dgnum.eu"

    # For reverse DNS
    # "ip6.arpa"
  ];

  SOA = {
    nameServer = "ns01.dgnum.eu.";
    adminEmail = "dns.dgnum.eu";
    serial = import ../serial.nix;
    retry = 3600;
    minimum = 300;
  };

  mkZone = zone:
    let
      secondaryDNS = builtins.map
        (ip: "${ip} NOKEY")
        (builtins.concatLists (builtins.attrValues (delegations.${zone} or { })));
    in
    {
      data =
        let attrs = import (mkRel ./. "_${zone}.nix") args; in
        dns.lib.toString zone (recursiveFuse [
          { inherit SOA; }
          attrs
          { NS = attrs.NS ++ (builtins.attrNames (delegations.${zone} or { })); }
        ]);

      provideXFR = secondaryDNS;
      notify = secondaryDNS;
    };
in

mapSingleFuse mkZone servedZones