/*
 * Copyright (C) 2015, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Binder IPC interface for interacting with Bluetooth GATT server-role
 * features.
 */
interface IBluetoothGattServer {
  /**
   * Registers a client application with this interface. This creates a unique
   * GATT server instance for the application that will contain the GATT
   * services belonging to the calling application. A special interface ID will
   * be returned in a callback to the application that can be used to perform
   * GATT server operations. Returns false in case of an error.
   */
  boolean registerServer(in IBluetoothGattServerCallback callback);

  /**
   * Unregisters a previously registered server with interface ID |server_if|.
   */
  void unregisterServer(in int server_if);

  /**
   * Unregisters all previously registered servers.
   */
  void unregisterAll();

  /**
   * Begins a new GATT service declaration. This will execute synchronously and
   * create a new service range. This can be followed by calls to populate the
   * service range with attributes. The started service won't be published and
   * made discoverable to remote devices until a successful call to
   * endServiceDeclaration.
   *
   * The created service will be assigned a unique identifier that can be used
   * by the caller to distinguish between different services. This will be
   * returned in |out_id| in case of success. Returns false in case of failure,
   * e.g. a service declaration is already in progress.
   */
  boolean beginServiceDeclaration(in int server_if, in boolean is_primary,
                                  in ParcelUuid uuid,
                                  out GattIdentifier out_id);

  /**
   * Adds a characteristic entry to a previously started service declaration.
   * Returns false in case of failure, e.g. if no service declaration was
   * started. Returns the uniquely assigned characteristic identifier in
   * |out_id| in the case of success.
   */
  boolean addCharacteristic(in int server_if, in ParcelUuid uuid,
                            in int properties, in int permissions,
                            out GattIdentifier out_id);

  /**
   * Adds a characteristic descriptor entry to a previously started service
   * declaration. Returns false in case of failure, e.g. if no service
   * declaration was started or if the declaration does not contain a
   * characteristic that can own this descriptor. Returns the uniquely assigned
   * descriptor identifier in |out_id| in the case of success.
   */
  boolean addDescriptor(in int server_if, in ParcelUuid uuid,
                        in int permissions,
                        out GattIdentifier out_id);

  /**
   * Ends a previously started service declaration and asynchronously publishes
   * the service in the underlying attribute database. Returns false in case of
   * an asynchronous failure, e.g. if no service declaration was started or
   * there is a pending call to endServiceDeclaration. Otherwise returns true
   * and reports the result of the operation asynchronously in
   * IBluetoothGattServerCallback.onServiceAdded.
   */
  boolean endServiceDeclaration(in int server_if);

  /**
   * Sends a response to a currently pending read or write request. The request
   * will be propagated to the application via IBluetoothGattServerCallback with
   * a unique |request_id| which must be passed to this method along with the
   * |device_address| of the device that the request originated from.
   *
   * The |status| field should contain the result of the operation. In the case
   * of success, the application should pass in "0". Otherwise this should
   * contain an ATT protocol error code.
   */
  boolean sendResponse(in int server_if, in String device_address,
                       in int request_id, in int status,
                       in int offset, in byte[] value);

  /**
   * Sends a handle-value notification or indication to the device with the
   * given address for the characteristic with the given identifier. |confirm|
   * should be set to true, if a handle-value indication should be sent, which
   * will remain pending until the remote device sends a handle-value
   * confirmation. Returns false if a call to this method is pending. Otherwise
   * reports the result asynchronously in
   * IBluetoothGattServerCallback.onNotificationSent.
   */
  boolean sendNotification(in int server_if, in String device_address,
                           in GattIdentifier characteristic_id,
                           in boolean confirm, in byte[] value);
}