{ 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 {
                    default = [ ];
                    type = with types; listOf str;
                    description = ''
                      (list)(Required)Array or comma delimited string, list of entities to group.
                    '';
                  };
                  all = mkOption {
                    default = false;
                    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; nullOr (attrsOf attrs);
          };
          input_datetime = mkOption {
            default = null;
            type = with types; nullOr (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;

  };
}