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

with lib;

let

  cfg = config.services.homeAssistantConfig;

in {

  options.services.homeAssistantConfig = mkOption {
    default = null;
    type = with types; nullOr (submodule { options = {
      group = mkOption {
        default = null;
        example = { schlafzimmer = { view = false; entities = [ "switch.pal01" ]; }; };
        type = with types; nullOr (attrsOf ( submodule {
          options = {
            name = mkOption {
              default = null;
              type = with types; nullOr str;
              description = ''
                (string)(Optional)Name of the group.
              '';
            };
            view = mkOption {
              default = false;
              type = with types; bool;
              description = ''
                (boolean)(Optional)If yes then the entry will be shown as a view (tab) at the top. Groups that are set to view: true cannot be used as entities in other views.
              '';
            };
            icon = mkOption {
              default = null;
              type = with types; nullOr str;
              description = ''
                (string)(Optional)If the group is a view, this icon will show at the top in the frontend instead of the name. If the group is a view and both name and icon have been specified, the icon will appear at the top of the frontend and the name will be displayed as the mouse-over text. If it’s not a view, then the icon shows when this group is used in another group.
              '';
            };
            control = mkOption {
              default = null;
              type = with types; nullOr str;
              description = ''
                (string)(Optional)Set value to hidden. If hidden then the group switch will be hidden.
              '';
            };
            entities = mkOption {
              type = with types; listOf str;
              description = ''
                (list)(Required)Array or comma delimited string, list of entities to group.
              '';
            };
            all = mkOption {
              default = true;
              type = with types; bool;
              description = ''
                (boolean)(Optional)Set this to true if the group state should only turn on if all grouped entities are on.
              '';
            };

          };
        }));
      };
      homeassistant = mkOption {
        type = with types; (submodule { options = {
          name = mkOption {
            default = "Home";
            type = with types; str;
          };
          time_zone = mkOption {
            default = config.time.timeZone;
            type = with types; str;
          };
          latitude = mkOption {
            default = 52.464031;
            type = with types; float;
          };
          longitude = mkOption {
            default = 13.381925;
            type = with types; float;
          };
          elevation = mkOption {
            default = 34;
            type = with types; int;
          };
          unit_system = mkOption {
            default = "metric";
            type = with types; str;
          };
          whitelist_external_dirs = mkOption {
            default = null;
            type = with types; nullOr (listOf str);
          };
          auth_providers = mkOption {
            default = null;
            type = with types; nullOr (listOf attrs);
          };
          customize = mkOption {
            type = with types; attrsOf (submodule{ options = {
              friendly_name = mkOption {
                type = with types; str;
              };
              entity_picture = mkOption {
                default = null;
                type = with types; nullOr str;
              };
              icon = mkOption {
                default = null;
                type = with types; nullOr str;
              };
            };});
          };
        };});
      };
      introduction = mkOption {
        default = {};
        type = with types; attrs;
      };
      frontend = mkOption {
        default = {};
        type = with types; attrs;
      };
      config = mkOption {
        default = {};
        type = with types; attrs;
      };
      http = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      discovery = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      history = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      logbook = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      logger = mkOption {
        default = {};
        type = with types; attrs;
      };
      lovelace = mkOption {
        default = { mode  = "yaml"; };
        type = with types; nullOr attrs;
      };
      map = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      mqtt = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      sun = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };

      switch = mkOption {
        default = null;
        type = with types; nullOr (listOf attrs);
      };
      binary_sensor = mkOption {
        default = null;
        type = with types; nullOr (listOf attrs);
      };
      sensor = mkOption {
        default = null;
        type = with types; nullOr (listOf attrs);
      };
      prometheus = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      automation = mkOption {
        default = null;
        type = with types; nullOr (listOf attrs);
      };
      media_player = mkOption {
        default = null;
        type = with types; nullOr (listOf attrs);
      };
      mysensors = mkOption {
        default = null;
        type = with types; nullOr attrs;
      };
      script = mkOption {
        default = null;
        type = with types; nullOr (attrsOf (submodule {
          options = {
            alias = mkOption {
              default = null;
              type = with types; nullOr str;
            };
            sequence = mkOption {
              default = [];
              type = with types; listOf attrs;
            };
          };
        }));
      };
      input_number = mkOption {
        default = null;
        type = with types; nullOr (attrsOf attrs);
      };
      input_text = mkOption {
        default = null;
        type = with types; nullOr (attrsOf attrs);
      };
      input_select = mkOption {
        default = null;
        type = with types; nullOr (attrsOf attrs);
      };
      input_boolean = mkOption {
        default = null;
        type = with types; (attrsOf attrs);
      };
      input_datetime = mkOption {
        default = null;
        type = with types; (attrsOf attrs);
      };
      calendar = mkOption {
        default = [];
        type = with types; listOf attrs;
      };
      shell_command = mkOption {
        default = null;
        type = with types; nullOr (attrsOf str);
      };

    };});
    description = ''
      home-assistant configuration
    '';
  };

  config = mkIf (cfg != null) {
    services.home-assistant.config =
      let

      sanitize = configuration: lib.getAttr (builtins.typeOf configuration) {
        bool = configuration;
        int = configuration;
        string = configuration;
        str = configuration;
        float = configuration;
        list = map sanitize configuration;
        set =
          let
            stripped = lib.flip lib.filterAttrs configuration
                  (name: value:
                    name != "_module"
                      && name != "_ref"
                      && value != null
                  );
            recursiveSanitized = lib.mapAttrs (lib.const sanitize) stripped;
          in
            if ( length ( attrNames configuration ) == 0 )
            then
              null
            else
              recursiveSanitized;
      };

      in
        sanitize cfg ;

  };
}