{
  lib,
  config,
  ...
}: {
  options.services.home-assistant = {
    postgres = {
      enable = lib.mkOption {
        type = lib.types.bool;
        default = false;
        description = "Use PostgreSQL instead of SQLite";
      };
      user = lib.mkOption {
        type = lib.types.str;
        default = "hass";
        description = "Database user name";
      };
      database = lib.mkOption {
        type = lib.types.str;
        default = "hass";
        description = "Database name";
      };
    };
  };

  config = lib.mkIf config.services.home-assistant.enable {
    assertions = [
      {
        assertion = !config.services.home-assistant.postgres.enable || config.services.postgresql.enable;
        message = "PostgreSQL must be enabled when using postgres database for Home Assistant";
      }
    ];

    services.postgresql.databases.home-assistant = lib.mkIf config.services.home-assistant.postgres.enable {
      enable = true;
      user = config.services.home-assistant.postgres.user;
      database = config.services.home-assistant.postgres.database;
    };

    services.home-assistant = lib.mkIf config.services.home-assistant.postgres.enable {
      extraPackages = python3Packages:
        with python3Packages; [
          psycopg2
        ];
    };

    systemd.services.home-assistant = lib.mkIf config.services.home-assistant.postgres.enable {
      requires = [
        config.systemd.services.postgresql.name
      ];
    };
  };
}