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

  imports = [
    #./home-assistant/mpd.nix
    #./home-assistant/timer.nix
    ./home-assistant/light-control.nix
    ./home-assistant/iot-control.nix
    ./home-assistant/chaospott.nix
    ./home-assistant/kodi.nix
    ./home-assistant/mqtt.nix
    ./home-assistant/sonoff.nix
    ./home-assistant/stocks.nix
    ./home-assistant/weather.nix
    ./home-assistant/workday.nix
    ./home-assistant/zigbee2mqtt.nix
  ];

  networking.firewall.allowedTCPPorts = [ 8123 ];
  networking.firewall.allowedUDPPorts = [ 8123 ];

  services.homeAssistantConfig = {

    # turn on to edit GUI
    lovelace = { };

    homeassistant = {

      name = "Home";
      latitude = 51.444847;
      longitude = 6.967006;
      elevation = 116;
      unit_system = "metric";

      time_zone = config.time.timeZone;
      auth_providers = [{
        type = "trusted_networks";
        trusted_networks = [
          config.module.cluster.services.tinc."private".networkSubnet
          "192.168.178.0/24"
          "127.0.0.1"
        ];
      }];

    };

    # needed, don't know why
    default_config = { };
    config = { };

    # to grab metrics via prometheus
    prometheus.namespace = "hass";

    # manual state
    # ------------
    # all scenes
    input_select.scene = {
      icon = "mdi:brightness-auto";
      options = [ "up-bright" "up-dark" "half" "down" "night" "outside" ];
    };
    # scenes controlled by buttons
    input_select.scene_button = {
      icon = "mdi:brightness-auto";
      options = [ "up-dark" "night" ];
    };
    input_boolean.situation_toggle.icon = "mdi:toggle-switch";
    input_boolean.printer_toggle.icon = "mdi:toggle-switch";

    input_boolean.windows_up.icon = "mdi:toggle-switch";

    automation = [

      {
        alias = "Hold Button -> Toggle Printer";
        trigger = {
          platform = "state";
          entity_id = "input_boolean.printer_toggle";
        };
        action = {
          service = "switch.toggle";
          data.entity_id = "switch.pal02";
        };
      }

      {
        alias = "set light-control scene";
        trigger = {
          platform = "state";
          entity_id = "input_select.scene";
        };
        action = {
          service = "mqtt.publish";
          data_template = {
            topic = "control/lights/set";
            payload_template =
              ''{"scene":"{{ states('input_select.scene')}}"}'';
          };
        };
      }

      # control situation with buttons
      {
        alias = "Button -> Change Scene";
        trigger = {
          platform = "state";
          entity_id = "input_boolean.situation_toggle";
        };
        action = {
          service = "input_select.select_next";
          data.entity_id = "input_select.scene_button";
        };
      }
      {
        alias = "Button Scene -> Scene";
        trigger = {
          platform = "state";
          entity_id = "input_select.scene_button";
        };
        action = {
          service = "input_select.select_option";
          data_template = {
            entity_id = "input_select.scene";
            option = "{{ states('input_select.scene_button') }}";
          };
        };
      }

      # outside and home
      {
        alias = "when opening door I'm outside";
        trigger = [
          {
            platform = "state";
            # todo : groups are not working right now
            entity_id = "binary_sensor.door_sensor_4";
            from = "off";
            to = "on";
          }
          {
            platform = "state";
            # todo : groups are not working right now
            entity_id = "binary_sensor.door_sensor_4";
            from = "on";
            to = "off";
          }
        ];
        action = [{
          service = "input_select.select_option";
          data = {
            entity_id = "input_select.scene";
            option = "outside";
          };
        }];
      }

      {
        alias = "reset everything when back home";
        trigger = map
          (entity_id: {
            platform = "state";
            entity_id = entity_id;
            from = "off";
            to = "on";
          }) [
          "binary_sensor.motion_sensor_1"
          "binary_sensor.motion_sensor_2"
          "binary_sensor.motion_sensor_3"
          "binary_sensor.motion_sensor_4"
          "binary_sensor.motion_sensor_5"
          "binary_sensor.motion_sensor_6"
          "binary_sensor.motion_sensor_7"
          "binary_sensor.motion_sensor_8"
        ];
        condition = {
          condition = "template";
          value_template =
            ''{{ states.input_select.scene.state == "outside" }}'';
        };
        action = [{
          service = "input_select.select_option";
          data = {
            entity_id = "input_select.scene";
            option = "up-dark";
          };
        }];
      }

    ];

    group =
      let
        create_room = { name, description }: {
          "${name}" = {
            name = "${description}";
            entities = [ ];
          };
        };
        create_rooms = rooms:
          lib.foldr (a: b: a // b) { } (map create_room rooms);
        # rooms
        # -----
      in
      (create_rooms [
        {
          name = "floor_room";
          description = "Flur";
        }
        {
          name = "bed_room";
          description = "Schlafzimmer";
        }
        {
          name = "living_room";
          description = "Wohnzimmer";
        }
        {
          name = "kitchen_room";
          description = "Küche";
        }
        {
          name = "bath_room";
          description = "Klo";
        }
      ]) // {

        # overview
        # --------
        all_sensors = { name = "Alle Sensoren"; };
        today = {
          name = "Today";
          entities = [ "input_select.scene" ];
        };
        # other stuff
        # -----------
        tv = { name = "TV"; };
        all_lights = { name = "Alle Lampen"; };
        unknown = {
          name = "Not Used";
          entities = [ ];
        };

      };

  };

  services.home-assistant = {
    enable = true;
    package = pkgs.unstable.home-assistant;
    #package = pkgs.unstable.home-assistant.override {
    #  python3 = pkgs.unstable.python37;
    #  extraPackages = python: [
    #    # todo : check which is still needed
    #    python.netdisco
    #    python.xmltodict
    #    python.mpd2
    #    # for mqtt
    #    python.hbmqtt
    #    python.paho-mqtt
    #    # needed for platform workday
    #    #(python.buildPythonPackage rec {
    #    #  pname = "holidays";
    #    #  version = "0.9.10";
    #    #  src = python.fetchPypi {
    #    #    inherit pname version;
    #    #    sha256 =
    #    #      "9f06d143eb708e8732230260636938f2f57114e94defd8fa2082408e0d422d6f";
    #    #  };
    #    #  doCheck = false;
    #    #  buildInputs = [ pkgs.dateutils ];
    #    #  propagatedBuildInputs = [ python."python-dateutil" python."six" ];
    #    #  meta = with pkgs.stdenv.lib; {
    #    #    homepage = "https://github.com/dr-prodigy/python-holidays";
    #    #    license = licenses.mit;
    #    #    description = "Generate and work with holidays in Python";
    #    #    maintainers = with maintainers; [ mrVanDalo ];
    #    #  };
    #    #})
    #  ];
    #};

  };

  # host nginx setup
  services.nginx = {
    enable = true;
    recommendedProxySettings = true;
    virtualHosts = {
      "iot.pepe.private" = {
        serverAliases = [ "hass.pepe.private" "home.pepe.private" ];
        extraConfig = ''
          proxy_buffering off;
        '';
        locations."/" = {
          proxyPass = "http://127.0.0.1:8123";
          proxyWebsockets = true;
          extraConfig = ''
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
          '';
        };
      };
    };
  };

}