{ lib, config, ... }:
with lib;
let
  interface-module =
    { name, config, ... }:
    {
      options = {
        enable = mkEnableOption "The PoE for interface ${name}.";
        xml = mkOption {
          type = types.str;
          visible = false;
          readOnly = true;
        };
      };
      config.xml = ''
        <interface><name>${name}</name>${optionalString (!config.enable) "<disable/>"}</interface>
      '';
    };
in
{
  options = {
    poe.interfaces = mkOption {
      type = types.attrsOf (types.submodule interface-module);
      default = { };
    };
    netconf.xmls.poe = mkOption {
      type = types.str;
      visible = false;
      readOnly = true;
    };
  };
  config.netconf.xmls.poe = ''
    <poe operation="replace">
      ${
        builtins.concatStringsSep "" (attrsets.mapAttrsToList (_: intf: intf.xml) config.poe.interfaces)
      }
    </poe>
  '';
}