/**
 * 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';
import {SoloHelper} from './helper';
import {ProtoAny} from '../../../../common';
import {DialogSpec} from '../conversation';

/** @public */
export interface PlaceOptions {
  /**
   * This is the initial response by location sub-dialog.
   * For example: "Where do you want to get picked up?"
   * @public
   */
  prompt: string;

  /**
   * This is the context for seeking permissions.
   * For example: "To find a place to pick you up"
   * Prompt to user: "*To find a place to pick you up*, I just need to check your location.
   *     Can I get that from Google?".
   * @public
   */
  context: string;
}

/** @public */
export type PlaceArgument = Api.GoogleActionsV2Location | undefined;

/**
 * Asks user to provide a geo-located place, possibly using contextual information,
 * like a store near the user's location or a contact's address.
 *
 * Developer provides custom text prompts to tailor the request handled by Google.
 *
 * @example
 * ```javascript
 *
 * // Actions SDK
 * const app = actionssdk()
 *
 * app.intent('actions.intent.MAIN', conv => {
 *   conv.ask(new Place({
 *     prompt: 'Where do you want to get picked up?',
 *     context: 'To find a place to pick you up',
 *   }))
 * })
 *
 * app.intent('actions.intent.PLACE', (conv, input, place, status) => {
 *   if (place) {
 *     conv.close(`Ah, I see. You want to get picked up at ${place.formattedAddress}`)
 *   } else {
 *     // Possibly do something with status
 *     conv.close(`Sorry, I couldn't find where you want to get picked up`)
 *   }
 * })
 *
 * // Dialogflow
 * const app = dialogflow()
 *
 * app.intent('Default Welcome Intent', conv => {
 *   conv.ask(new Place({
 *     prompt: 'Where do you want to get picked up?',
 *     context: 'To find a place to pick you up',
 *   }))
 * })
 *
 * // Create a Dialogflow intent with the `actions_intent_PLACE` event
 * app.intent('Get Place', (conv, params, place, status) => {
 *   if (place) {
 *     conv.close(`Ah, I see. You want to get picked up at ${place.formattedAddress}`)
 *   } else {
 *     // Possibly do something with status
 *     conv.close(`Sorry, I couldn't find where you want to get picked up`)
 *   }
 * })
 * ```
 *
 * @public
 */
export class Place extends SoloHelper<
  'actions.intent.PLACE',
  Api.GoogleActionsV2PlaceValueSpec
> {
  /**
   * @param options Place options
   * @public
   */
  constructor(options: PlaceOptions) {
    const extension: ProtoAny<
      DialogSpec,
      Api.GoogleActionsV2PlaceValueSpecPlaceDialogSpec
    > = {
      '@type':
        'type.googleapis.com/google.actions.v2.PlaceValueSpec.PlaceDialogSpec',
      permissionContext: options.context,
      requestPrompt: options.prompt,
    };

    super({
      intent: 'actions.intent.PLACE',
      type: 'type.googleapis.com/google.actions.v2.PlaceValueSpec',
      data: {
        dialogSpec: {
          extension,
        },
      },
    });
  }
}