{ config, ... }: {
  services.homeAssistantConfig = {

    # todo: add holidays package to home-assiatnt
    binary_sensor = [
      {
        name = "before_workday";
        platform = "workday";
        country = "DE";
        province = "NW";
        workdays = [ "mon" "tue" "wed" "thu" "fri" ];
        days_offset = 1;
      }
      {
        name = "workday";
        platform = "workday";
        country = "DE";
        province = "NW";
        workdays = [ "mon" "tue" "wed" "thu" "fri" ];
      }
    ];

    homeassistant.customize = {
      "binary_sensor.workday" = {
        icon = "mdi:calendar";
        friendly_name = "Today?";
      };
      "binary_sensor.before_workday" = {
        icon = "mdi:calendar";
        friendly_name = "Tomorrow?";
      };
    };

    group = {
      is_workday = {
        name = "Workday";
        control = "hidden";
        entities = [ "binary_sensor.before_workday" "binary_sensor.workday" ];
      };
      view_overview.entities = [ "group.is_workday" ];
    };

  };

}