{ pkgs, lib, ... }:
let

  # https://www.zigbee2mqtt.io/devices/AC10787.html
  allDevices = {
    "light_1" = { id = "0x7cb03eaa0a0347b5"; };
    "light_2" = { id = "0x7cb03eaa0a0387b9"; };
    "light_3" = { id = "0x7cb03eaa0a033a86"; };
    "light_4" = { id = "0x7cb03eaa0a04aabf"; };
    "light_5" = { id = "0x7cb03eaa0a0346e4"; };
    "light_6" = { id = "0x7cb03eaa0a034b46"; };
    "light_7" = { id = "0x7cb03eaa0a033b4f"; };
    "light_8" = { id = "0x7cb03eaa0a0384d3"; };
  };

in
{

  services.zigbee2mqttConfiguration = lib.mapAttrs'
    (name:
      { id, ... }: {
        name = id;
        value = {
          retain = false;
          friendly_name = name;
          osram_set_transition = 2; # time in seconds (integer or float)
        };
      })
    allDevices;

  services.homeAssistantConfig = {

    light = lib.mapAttrsToList
      (name:
        { ... }: {
          platform = "mqtt";
          name = name;
          state_topic = "zigbee2mqtt/${name}";
          availability_topic = "zigbee2mqtt/bridge/state";
          command_topic = "zigbee2mqtt/${name}/set";
          value_template = "{{ value_json.click }}";
          brightness = true;
          color_temp = true;
          schema = "json";
        })
      allDevices;

    #  sensor = with lib;
    #    mapAttrsToList (name:
    #      { ... }: {
    #        name = "link_${name}";
    #        platform = "mqtt";
    #        state_topic = "zigbee2mqtt/${name}";
    #        availability_topic = "zigbee2mqtt/bridge/state";
    #        icon = "mdi:signal";
    #        value_template = "{{ value_json.linkquality}}";
    #      }) allDevices;

    #  binary_sensor = lib.mapAttrsToList (name:
    #    { ... }: {
    #      name = "update_${name}";
    #      platform = "mqtt";
    #      state_topic = "zigbee2mqtt/${name}";
    #      availability_topic = "zigbee2mqtt/bridge/state";
    #      payload_on = true;
    #      payload_off = false;
    #      value_template = "{{ value_json.update_available }}";
    #    }) allDevices;

    #  # create groups
    #  # -------------
    #  group = let

    #    # to have nice panels for every device
    #    lightGroups = lib.mapAttrs (name:
    #      { ... }: {
    #        entities = [
    #          "light.${name}"
    #          "sensor.link_${name}"
    #          "binary_sensor.update_${name}"
    #        ];
    #      }) allDevices;

    #    # sort lights into given groups.
    #    sortedInGroups = let
    #      groupEntries = lib.zipAttrs (lib.flatten (lib.mapAttrsToList (name:
    #        { groups ? [ ], ... }:
    #        map (groupName: { "${groupName}" = "light.${name}"; }) groups)
    #        allDevices));
    #    in lib.mapAttrs (name: entities: { inherit entities; }) groupEntries;

    #  in sortedInGroups // lightGroups // {
    #    all_lights.entities =
    #      lib.mapAttrsToList (name: { ... }: "light.${name}") allDevices;
    #  };

  };

}