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

with lib;

let
  acmeChallengeZonefile = domain: let
    reverseDomain = concatStringsSep "." (reverseList (["_acme-challenge"] ++ splitString "." domain));
  in pkgs.writeText "${reverseDomain}.zone" ''
    $ORIGIN _acme-challenge.${domain}.
    $TTL 3600
    @ IN SOA ns.yggdrasil.li. root.yggdrasil.li. 2022022103 10800 3600 604800 30

         IN NS ns.yggdrasil.li.
  '';
in {
  config = {
    fileSystems."/var/lib/knot" =
      { device = "surtr/safe/var-lib-knot";
        fsType = "zfs";
      };

    systemd.services.knot.unitConfig.RequiresMountsFor = [ "/var/lib/knot" ];
    
    services.knot = {
      enable = true;
      keyFiles = [
        config.sops.secrets."rheperire.org_acme_key.yaml".path
        config.sops.secrets."knot_local_key.yaml".path
      ];
      extraConfig = ''
        server:
          listen: 127.0.0.1@53
          listen: ::1@53
          listen: 202.61.241.61@53
          listen: 2a03:4000:52:ada::@53

        remote:
          - id: inwx_notify
            address: 185.181.104.96@53
          - id: recursive
            address: ::1@5353
          - id: local
            address: ::1@53
            key: local_key

        acl:
          - id: inwx_acl
            address: 185.181.104.96
            action: transfer
          - id: rheperire.org_acme_acl
            key: rheperire.org_acme_key
            action: update
          - id: local_acl
            key: local_key
            action: update
            update-type: DS

        mod-rrl:
          - id: default
            rate-limit: 200
            slip: 2

        mod-cookies:
          - id: default
            secret-lifetime: 4h
            badcookie-slip: 1

        submission:
          - id: validating-resolver
            parent: recursive
            check-interval: 5m

        policy:
          - id: rsa2048
            algorithm: rsasha256
            ksk-size: 4096
            zsk-size: 2048
            zsk-lifetime: 30d
            ksk-submission: validating-resolver
          - id: ed25519
            algorithm: ed25519
            nsec3: on
            nsec3-iterations: 0
            ksk-lifetime: 360d
            signing-threads: 2
            ksk-submission: validating-resolver
          - id: ed25519_local-push
            algorithm: ed25519
            nsec3: on
            nsec3-iterations: 0
            ksk-lifetime: 360d
            signing-threads: 2
            ksk-submission: validating-resolver
            cds-cdnskey-publish: double-ds
            ds-push: [local]

        template:
          - id: default
            global-module: [mod-cookies/default, mod-rrl/default]
          - id: inwx_zone
            storage: /var/lib/knot
            zonefile-sync: -1
            zonefile-load: difference-no-serial
            serial-policy: dateserial
            journal-content: all
            semantic-checks: on
            dnssec-signing: on
            dnssec-policy: ed25519
            notify: [inwx_notify]
            acl: [inwx_acl]
          - id: acme_zone
            storage: /var/lib/knot
            zonefile-sync: -1
            zonefile-load: difference-no-serial
            serial-policy: dateserial
            journal-content: all
            semantic-checks: on
            dnssec-signing: on
            dnssec-policy: ed25519_local-push

        zone:
          - domain: yggdrasil.li
            template: inwx_zone
            file: ${./zones/li.yggdrasil.soa}

          - domain: nights.email
            template: inwx_zone
            file: ${./zones/email.nights.soa}

          - domain: 141.li
            template: inwx_zone
            file: ${./zones/li.141.soa}

          - domain: kleen.li
            template: inwx_zone
            file: ${./zones/li.kleen.soa}

          - domain: xmpp.li
            template: inwx_zone
            file: ${./zones/li.xmpp.soa}

          - domain: dirty-haskell.org
            template: inwx_zone
            file: ${./zones/org.dirty-haskell.soa}

          - domain: praseodym.org
            template: inwx_zone
            file: ${./zones/org.praseodym.soa}

          - domain: rheperire.org
            template: inwx_zone
            file: ${./zones/org.rheperire.soa}
          - domain: _acme-challenge.rheperire.org
            template: acme_zone
            acl: [ rheperire.org_acme_acl ]
            file: ${acmeChallengeZonefile "rheperire.org"}
      '';
    };

    sops.secrets = {
      "rheperire.org_acme_key.yaml" = {
        format = "binary";
        owner = "knot";
        sopsFile = ./keys/rheperire.org_acme.yaml;
      };
      "knot_local_key.yaml" = {
        format = "binary";
        owner = "knot";
        sopsFile = ./keys/local_key.yaml;
      };
    };


    fileSystems."/var/lib/unbound" =
      { device = "surtr/local/var-lib-unbound";
        fsType = "zfs";
      };

    systemd.services.unbound.unitConfig.RequiresMountsFor = [ "/var/lib/unbound" ];

    services.unbound = {
      enable = true;
      resolveLocalQueries = false;
      stateDir = "/var/lib/unbound";
      localControlSocketPath = "/run/unbound/unbound.ctl";

      settings = {
        server = {
          interface = ["127.0.0.1@5353" "::1@5353"];
          access-control = ["127.0.0.0/8 allow" "::1/128 allow"];
          root-hints = "${pkgs.dns-root-data}/root.hints";

          num-threads = 12;
          so-reuseport = true;
          msg-cache-slabs = 16;
          rrset-cache-slabs = 16;
          infra-cache-slabs = 16;
          key-cache-slabs = 16;

          rrset-cache-size = "100m";
          msg-cache-size = "50m";
          outgoing-range = 8192;
          num-queries-per-thread = 4096;

          so-rcvbuf = "4m";
          so-sndbuf = "4m";

          # serve-expired = true;
          # serve-expired-ttl = 86400;
          # serve-expired-reply-ttl = 0;

          prefetch = true;
          prefetch-key = true;

          minimal-responses = false;

          extended-statistics = true;

          rrset-roundrobin = true;
          use-caps-for-id = true;
        };
      };
    };
  };
}