/**
 * Copyright 2018 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 * as Api from '../../api/v2';

/** @public */
export interface MediaObjectOptions {
  /**
   * MediaObject URL.
   * @public
   */
  url: string;

  /** @public */
  description?: string;

  /**
   * Name of the MediaObject.
   * @public
   */
  name?: string;

  /**
   * Icon image.
   * @public
   */
  icon?: Api.GoogleActionsV2UiElementsImage;

  /**
   * Large image.
   * @public
   */
  image?: Api.GoogleActionsV2UiElementsImage;
}

const toMediaObject = (object: MediaObjectString) => {
  if (typeof object === 'string') {
    return new MediaObject(object);
  }
  return object;
};

/**
 * Class for initializing and constructing MediaObject
 * @public
 */
export interface MediaObject extends Api.GoogleActionsV2MediaObject {}
export class MediaObject implements Api.GoogleActionsV2MediaObject {
  /**
   * @param options MediaObject options or just a string for the url
   * @public
   */
  constructor(options: MediaObjectOptions | string) {
    if (typeof options === 'string') {
      this.contentUrl = options;
      return;
    }
    this.contentUrl = options.url;
    this.description = options.description;
    this.icon = options.icon;
    this.largeImage = options.image;
    this.name = options.name;
  }
}

export type MediaObjectString = Api.GoogleActionsV2MediaObject | string;

/** @public */
export interface MediaResponseOptions {
  /**
   * Array of MediaObject held in the MediaResponse.
   * @public
   */
  objects: MediaObjectString[];
  /**
   * Type of the media within this MediaResponse.
   * Defaults to 'AUDIO'
   * @public
   */
  type?: Api.GoogleActionsV2MediaResponseMediaType;
}

const isOptions = (
  options: MediaResponseOptions | MediaObjectString
): options is MediaResponseOptions => {
  const test = options as MediaResponseOptions;
  return Array.isArray(test.objects);
};

/**
 * Class for initializing and constructing MediaResponse.
 * @public
 */
export interface MediaResponse extends Api.GoogleActionsV2MediaResponse {}
export class MediaResponse implements Api.GoogleActionsV2MediaResponse {
  /**
   * @param options MediaResponse options
   * @public
   */
  constructor(options: MediaResponseOptions);
  /**
   * @param objects MediaObjects
   * @public
   */
  constructor(objects: MediaObjectString[]);
  /**
   * @param objects MediaObjects
   * @public
   */
  constructor(...objects: MediaObjectString[]);
  constructor(
    options?: MediaResponseOptions | MediaObjectString[] | MediaObjectString,
    ...objects: MediaObjectString[]
  ) {
    this.mediaType = 'AUDIO';

    if (!options) {
      this.mediaObjects = [];
      return;
    }

    if (Array.isArray(options)) {
      this.mediaObjects = options.map(o => toMediaObject(o));
      return;
    }

    if (isOptions(options)) {
      this.mediaType = options.type || this.mediaType;
      this.mediaObjects = options.objects.map(o => toMediaObject(o));
      return;
    }
    this.mediaObjects = [options].concat(objects).map(o => toMediaObject(o));
  }
}