/*!

 * Copyright 2017 Google Inc. All Rights Reserved.

 *

 * 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.

 */

import {grpc, CallOptions, Operation as GaxOperation} from 'google-gax';

import {google as instanceAdmin} from '../protos/protos';

import {google as databaseAdmin} from '../protos/protos';

export type IOperation = instanceAdmin.longrunning.IOperation;

export type Schema =

  | string

  | string[]

  | databaseAdmin.spanner.admin.database.v1.IUpdateDatabaseDdlRequest;

export interface ResourceCallback<Resource, Response> {

  (

    err: grpc.ServiceError | null,

    resource?: Resource | null,

    response?: Response

  ): void;

}

export type PagedResponse<Item, Response> = [Item[], {} | null, Response];

export type RequestCallback<T, R = void> = R extends void

  ? NormalCallback<T>

  : PagedCallback<T, R>;

export interface NormalCallback<TResponse> {

  (err: grpc.ServiceError | null, res?: TResponse | null): void;

}

export interface PagedCallback<Item, Response> {

  (

    err: grpc.ServiceError | null,

    results?: Item[] | null,

    nextQuery?: {} | null,

    response?: Response | null

  ): void;

}

export interface LongRunningCallback<Resource> {

  (

    err: grpc.ServiceError | null,

    resource?: Resource | null,

    operation?: GaxOperation | null,

    apiResponse?: IOperation

  ): void;

}

export interface PagedOptions {

  pageSize?: number;

  pageToken?: string;

  gaxOptions?: CallOptions;

}

export interface PagedOptionsWithFilter extends PagedOptions {

  filter?: string;

}

/*!

 * HTTP header for the resource prefix to improve routing

 * by the backend.

 */

export const CLOUD_RESOURCE_HEADER = 'google-cloud-resource-prefix';