/**
 * Homebridge service helper utilities.
 *
 * @module
 */
import type { PlatformAccessory, Service, WithUUID } from "homebridge";
import { type Nullable } from "./util.js";
/**
 * Utility method that either creates a new service on an accessory if needed, or returns an existing one. Optionally, it executes a callback to initialize a new
 * service instance. Additionally, the various name characteristics of the service are set to the specified name, and optionally added if necessary.
 *
 * @param accessory       - The Homebridge accessory to check or modify.
 * @param serviceType     - The type of service to instantiate or retrieve.
 * @param name            - Name to be displayed to the end user for this service.
 * @param subtype         - Optional service subtype to uniquely identify the service.
 * @param onServiceCreate - Optional callback invoked only when a new service is created, receiving the new service as its argument.
 *
 * @returns Returns the created or retrieved service, or `null` if service creation failed.
 *
 * @remarks
 * This method ensures that the service's display name and available name characteristics are updated to the specified name. If `onServiceCreate` is provided,
 * it will only be called for newly created services, not for existing ones.
 *
 * The `ConfiguredName` and `Name` characteristics are conditionally added or updated based on the type of service, in accordance with HomeKit requirements.
 *
 * @example
 * ```typescript
 * // Example: Ensure a Lightbulb service exists with a user-friendly name, and initialize it if newly created.
 * const lightbulbService = acquireService(accessory, hap.Service.Lightbulb, "Living Room Lamp", undefined, (svc: Service): void => {
 *
 *   // Called only if the service is newly created.
 *   svc.setCharacteristic(hap.Characteristic.On, false);
 * });
 *
 * if(lightbulbService) {
 *
 *   // Service is now available, with display name set and optional characteristics managed.
 *   lightbulbService.updateCharacteristic(hap.Characteristic.Brightness, 75);
 * }
 * ```
 *
 * @see setServiceName — updates the newly created (or existing) service’s name-related characteristics.
 * @see validService — validate or prune services after acquisition.
 * @category Accessory
 */
export declare function acquireService(accessory: PlatformAccessory, serviceType: WithUUID<typeof Service>, name: string, subtype?: string, onServiceCreate?: (svc: Service) => void): Nullable<Service>;
/**
 * Validates whether a specific service should exist on the given accessory, removing the service if it fails validation.
 *
 * @param accessory   - The Homebridge accessory to inspect and potentially modify.
 * @param serviceType - The type of Homebridge service being checked or instantiated.
 * @param validate    - A boolean or a function that determines if the service should exist. If a function is provided, it receives a boolean indicating whether the
 *                      service currently exists, and should return `true` to keep the service, or `false` to remove it.
 * @param subtype     - Optional service subtype to uniquely identify the service.
 *
 * @returns `true` if the service is valid (and kept), or `false` if it was removed.
 *
 * @remarks
 * The `validate` parameter can be either:
 *   - a boolean (where `true` means keep the service, `false` means remove it).
 *   - a function (which is called with `hasService: boolean` and returns whether to keep the service).
 *
 * If the service should not exist according to `validate`, and it is currently present, this function will remove it from the accessory.
 *
 * @example
 * ```typescript
 * // Remove a service if it exists
 * validService(accessory, Service.Switch, false);
 *
 * // Only keep a service if a configuration flag is true
 * validService(accessory, Service.Switch, config.enableSwitch);
 *
 * // Keep a service if it currently exists, or add it if a certain condition is met
 * validService(accessory, Service.Switch, (hasService) => hasService || config.enableSwitch);
 * ```
 *
 * @see acquireService — to add or retrieve services.
 * @category Accessory
 */
export declare function validService(accessory: PlatformAccessory, serviceType: WithUUID<typeof Service>, validate: boolean | ((hasService: boolean) => boolean), subtype?: string): boolean;
/**
 * Retrieves the primary name of a service, preferring the ConfiguredName characteristic over the Name characteristic.
 *
 * @param service - The service from which to retrieve the name.
 * @returns The configured or display name of the service, or `undefined` if neither is set.
 *
 * @see setServiceName — to update the current name on a service.
 * @category Accessory
 */
export declare function getServiceName(service?: Service): string | undefined;
/**
 * Updates the displayName and applicable name characteristics of a service to the specified value.
 *
 * @param service - The service to update.
 * @param name    - The new name to apply to the service.
 *
 * @remarks
 * This function ensures the name is validated, updates the service's `displayName`, and sets the `ConfiguredName` and `Name`
 * characteristics when supported by the service type.
 *
 * @see acquireService — to add or retrieve services.
 * @see getServiceName — to retrieve the current name set on a service.
 * @category Accessory
 */
export declare function setServiceName(service: Service, name: string): void;