{ pkgs, config, lib, ... }:
let unstablePkgs = import <nixpkgs-unstable> { };
in {

  imports = [
    #./home-assistant/mpd.nix
    #./home-assistant/timer.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
  ];

  services.homeAssistantConfig = {

    # turn on to edit GUI
    # lovelace = {};

    homeassistant = {
      latitude = 51.444847;
      longitude = 6.967006;
      elevation = 116;

      auth_providers = [{
        type = "trusted_networks";
        trusted_networks =
          [ config.module.cluster.services.tinc."private".networkSubnet ];
      }];
    };

    prometheus.namespace = "hass";

    # manual state
    # ------------
    input_select.situation = {
      icon = "mdi:brightness-auto";
      options = [
        # it is dark outside and I want it to be bright inside
        "dark"
        # it is bright outside, so no need to be bright inside
        "bright"
        # it is dark ouside, but I don't want it bright inside
        "essential"
      ];
    };
    input_boolean.bed_room_buttons.icon = "mdi:toggle-switch";
    input_boolean.situation_toggle.icon = "mdi:toggle-switch";

    automation = let

      allRooms =
        [ "living_room" "floor_room" "bath_room" "bed_room" "kitchen_room" ];

      roomPresents = {
        # group of the room that should be turned on
        roomGroup,
        # group of the room that should be turned off
        roomOffGroup ? roomGroup,
        # group of the room that that indicates presents in the room
        presentsGroup,
        # global situation
        situation,
        # brightness for dimable lights
        brightness ? 255 }: [
          {
            alias = "presents -> turn on ${roomGroup} lights in ${situation}";
            trigger = {
              platform = "state";
              entity_id = "group.${presentsGroup}";
              from = "off";
              to = "on";
            };
            condition = {
              condition = "state";
              entity_id = "input_select.situation";
              state = situation;
            };
            action = [
              {
                service = "switch.turn_on";
                data.entity_id = "group.${roomGroup}";
              }
              {
                service = "light.turn_on";
                data = {
                  entity_id = "group.${roomGroup}";
                  brightness = brightness;
                };
              }
            ];
          }
          {
            alias =
              "absents -> turn off ${roomOffGroup} lights in ${situation}";
            trigger = {
              platform = "state";
              entity_id = "group.${presentsGroup}";
              from = "on";
              to = "off";
            };
            condition = {
              condition = "state";
              entity_id = "input_select.situation";
              state = situation;
            };
            action = [
              {
                service = "switch.turn_off";
                data.entity_id = "group.${roomOffGroup}";
              }
              {
                service = "light.turn_off";
                data.entity_id = "group.${roomOffGroup}";
              }
            ];
          }
        ];

      situationSwitch = { fromRoomGroup, toRoomGroup, presentsGroup
        , fromSituation, toSituation,
        # brightness for dimable lights
        brightness ? 255 }: [
          {
            alias =
              "${fromSituation} -> ${toSituation} for ${fromRoomGroup} -> ${toRoomGroup} on";
            trigger = {
              platform = "state";
              entity_id = "input_select.situation";
              from = fromSituation;
              to = toSituation;
            };
            condition = {
              condition = "state";
              entity_id = "group.${presentsGroup}";
              state = "on";
            };
            action = [
              {
                service = "switch.turn_off";
                data.entity_id = "group.${fromRoomGroup}";
              }
              {
                service = "light.turn_off";
                data.entity_id = "group.${fromRoomGroup}";
              }
              {
                service = "switch.turn_on";
                data.entity_id = "group.${toRoomGroup}";
              }
              {
                service = "light.turn_on";
                data = {
                  entity_id = "group.${toRoomGroup}";
                  brightness = brightness;
                };
              }
            ];
          }
          {
            alias =
              "${fromSituation} -> ${toSituation} for ${fromRoomGroup} -> ${toRoomGroup} off";
            trigger = {
              platform = "state";
              entity_id = "input_select.situation";
              from = fromSituation;
              to = toSituation;
            };
            condition = {
              condition = "state";
              entity_id = "group.${presentsGroup}";
              state = "off";
            };
            action = [
              {
                service = "switch.turn_off";
                data.entity_id = "group.${fromRoomGroup}";
              }
              {
                service = "light.turn_off";
                data.entity_id = "group.${fromRoomGroup}";
              }
            ];
          }
        ];

    in lib.flatten (map roomPresents (lib.flatten (map (name: [
      {
        roomGroup = "${name}_lights";
        presentsGroup = "${name}_present";
        situation = "dark";
      }
      {
        roomGroup = "${name}_essential";
        roomOffGroup = "${name}_lights";
        presentsGroup = "${name}_present";
        situation = "essential";
        brightness = 30;
      }
    ]) allRooms))) ++ [

      # control situation with buttons
      {
        alias = "set essential";
        trigger = {
          platform = "state";
          entity_id = "input_boolean.situation_toggle";
          from = "off";
          to = "on";
        };
        action = {
          service = "input_select.select_option";
          data = {
            entity_id = "input_select.situation";
            option = "essential";
          };
        };
      }
      {
        alias = "unset essential";
        trigger = {
          platform = "state";
          entity_id = "input_boolean.situation_toggle";
          from = "on";
          to = "off";
        };
        action = {
          service = "input_select.select_option";
          data = {
            entity_id = "input_select.situation";
            option = "dark";
          };
        };
      }
    ] ++ (lib.flatten (map situationSwitch (lib.flatten (map (name: [
      {
        presentsGroup = "${name}_present";
        fromSituation = "dark";
        toSituation = "essential";
        fromRoomGroup = "${name}_lights";
        toRoomGroup = "${name}_essential";
        brightness = 30;
      }
      {
        presentsGroup = "${name}_present";
        fromSituation = "essential";
        toSituation = "dark";
        fromRoomGroup = "${name}_essential";
        toRoomGroup = "${name}_lights";
      }
    ]) allRooms))));

    group = let
      create_room = { name, description }: {
        "${name}" = {
          name = "${description}";
          view = false;
          control = "hidden";
          entities = [ ];
        };
        "${name}_lights" = {
          name = "${description} Beleuchtung";
          view = false;
          entities = [ ];
        };
        "${name}_present" = {
          control = "hidden";
          name = "${description} Anwesend";
          view = false;
          entities = [ ];
        };
        "${name}_essential" = {
          control = "hidden";
          name = "${description} Minimale Beleuchtung";
          view = false;
          entities = [ ];
        };
        "view_${name}" = {
          name = description;
          view = true;
          entities = [
            "group.${name}"
            "group.${name}_lights"
            "group.${name}_present"
            "group.${name}_essential"
          ];
        };
      };
      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";
      }
    ]) // {
      view_rooms = {
        name = "Räume";
        view = true;
        entities = [
          "group.floor_room"
          "group.bed_room"
          "group.living_room"
          "group.kitchen_room"
          "group.bath_room"
        ];
      };

      # overview
      # --------
      all_sensors = {
        name = "Alle Sensoren";
        control = "hidden";
      };
      today = {
        control = "hidden";
        name = "Today";
        view = false;
        entities = [ "input_select.situation" ];
      };
      view_overview = {
        name = "Übersicht";
        view = true;
        entities = [ "group.today" ];
      };

      # other stuff
      # -----------
      tv = {
        name = "TV";
        view = false;
      };
      all_lights = {
        name = "Alle Lampen";
        view = false;
      };
      unknown = {
        control = "hidden";
        name = "Not Used";
        view = false;
        entities = [ ];
      };

    };

    script.turn_all_off.sequence = [ ];
    script.turn_all_lights_off.sequence = [ ];

  };

  services.home-assistant = {
    enable = true;
    package = unstablePkgs.home-assistant.override {
      python3 = unstablePkgs.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" ];
        locations."/" = { proxyPass = "http://pepe.private:8123"; };
      };
    };
  };

}