/**
 * @license
 * Copyright 2020 Google LLC.
 *
 * 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.
 */

// For some reason, the linter doesn't recognize that these are used elsewhere
// in the SDK
/* eslint-disable @typescript-eslint/no-unused-vars */

declare namespace gapi {
  type LoadCallback = () => void;
  interface LoadConfig {}
  interface LoadOptions {
    callback?: LoadCallback;
    timeout?: number;
    ontimeout?: LoadCallback;
  }
  function load(
    features: 'gapi.iframes',
    options?: LoadOptions | LoadCallback
  ): void;
}

declare namespace gapi.iframes {
  interface Message {
    type: string;
  }

  type IframesFilter = (iframe: Iframe) => boolean;
  type MessageHandler<T extends Message> = (
    message: T
  ) => unknown | Promise<void>;
  type SendCallback = () => void;
  type Callback = (iframe: Iframe) => void;

  class Context {
    open(
      options: Record<string, unknown>,
      callback?: Callback
    ): Promise<Iframe>;
  }

  class Iframe {
    register<T extends Message>(
      message: string,
      handler: MessageHandler<T>,
      filter?: IframesFilter
    ): void;
    send<T extends Message, U extends Message>(
      type: string,
      data: T,
      callback?: MessageHandler<U>,
      filter?: IframesFilter
    ): void;
    ping(callback: SendCallback, data?: unknown): Promise<unknown[]>;
    restyle(
      style: Record<string, string | boolean>,
      callback?: SendCallback
    ): Promise<unknown[]>;
  }

  const CROSS_ORIGIN_IFRAMES_FILTER: IframesFilter;

  function getContext(): Context;
}