{
  config,
  ...
}:
let
  inherit (config.networking) domain hostName;

  backend = config.services.adguardhome;
in
{
  services.adguardhome = {
    enable = true;
    host = "[::1]";

    mutableSettings = false;
    settings = {
      dhcp.enabled = false;

      dns = {
        bind_hosts = [ "::" ];

        hostsfile_enabled = false;

        trusted_proxies = [ "::1" ];
        enable_dnssec = true;
        filtering = {
          protection_enabled = true;
          filtering_enabled = true;
          blocking_mode = "refused";
        };

        cache_enabled = true;
        cache_optimistic = true;
      };
    };
  };

  services.dnsmasq.settings.cname = [
    "dns.${domain},${hostName}.${domain}"
  ];
  services.caddy.virtualHosts = {
    "dns.${domain}" = {
      extraConfig = ''
        tls {
          issuer internal {
            ca home
          }
        }
        encode
        reverse_proxy http://${backend.host}:${toString backend.port}
      '';
    };
  };
}