/**
 * 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 {SimpleResponse} from './simple';
import {BasicCard, Table} from './card';
import {BrowseCarousel} from './browse';
import {MediaResponse} from './media';
import {OrderUpdate} from './order';
import {LinkOutSuggestion} from './linkout';
import {Suggestions} from './suggestion';
import {HtmlResponse} from './html';

/** @public */
export type RichResponseItem =
  | string
  | SimpleResponse
  | BasicCard
  | Table
  | BrowseCarousel
  | MediaResponse
  | OrderUpdate
  | LinkOutSuggestion
  | HtmlResponse
  | Api.GoogleActionsV2RichResponseItem;

/** @public */
export interface RichResponseOptions {
  /**
   * Ordered list of either SimpleResponse objects or BasicCard objects.
   * First item must be SimpleResponse. There can be at most one card.
   * @public
   */
  items?: RichResponseItem[];

  /**
   * Ordered list of text suggestions to display. Optional.
   * @public
   */
  suggestions?: string[] | Suggestions;

  /**
   * Link Out Suggestion chip for this rich response. Optional.
   * @public
   */
  link?: Api.GoogleActionsV2UiElementsLinkOutSuggestion;
}

const isOptions = (
  options: RichResponseOptions | RichResponseItem
): options is RichResponseOptions => {
  const test = options as RichResponseOptions;
  return (
    typeof test.link === 'object' ||
    Array.isArray(test.items) ||
    Array.isArray(test.suggestions) ||
    test.suggestions instanceof Suggestions
  );
};

/**
 * Class for initializing and constructing Rich Responses with chainable interface.
 * @public
 */
export interface RichResponse extends Api.GoogleActionsV2RichResponse {}
export class RichResponse implements Api.GoogleActionsV2RichResponse {
  /**
   * @param options RichResponse options
   * @public
   */
  constructor(options: RichResponseOptions);
  /**
   * @param items RichResponse items
   * @public
   */
  constructor(items: RichResponseItem[]);
  /**
   * @param items RichResponse items
   * @public
   */
  constructor(...items: RichResponseItem[]);
  constructor(
    options?: RichResponseOptions | RichResponseItem[] | RichResponseItem,
    ...items: RichResponseItem[]
  ) {
    this.items = [];
    if (!options) {
      return;
    }
    if (Array.isArray(options)) {
      this.add(...options);
      return;
    }
    if (isOptions(options)) {
      if (options.items) {
        this.add(...options.items);
      }
      const {link, suggestions} = options;
      this.linkOutSuggestion = link;
      if (suggestions) {
        if (Array.isArray(suggestions)) {
          this.addSuggestion(...suggestions);
        } else {
          this.addSuggestion(suggestions);
        }
      }
      return;
    }
    this.add(options, ...items);
  }

  /**
   * Add a RichResponse item
   * @public
   */
  add(...items: RichResponseItem[]) {
    const raw = this.items!;
    for (const item of items) {
      if (typeof item === 'string') {
        this.add(new SimpleResponse(item));
        continue;
      }
      if (item instanceof LinkOutSuggestion) {
        this.linkOutSuggestion = item;
        continue;
      }
      if (item instanceof SimpleResponse) {
        raw.push({simpleResponse: item});
        continue;
      }
      if (item instanceof BasicCard) {
        raw.push({basicCard: item});
        continue;
      }
      if (item instanceof Table) {
        raw.push({tableCard: item});
        continue;
      }
      if (item instanceof BrowseCarousel) {
        raw.push({carouselBrowse: item});
        continue;
      }
      if (item instanceof MediaResponse) {
        raw.push({mediaResponse: item});
        continue;
      }
      if (item instanceof OrderUpdate) {
        raw.push({structuredResponse: {orderUpdate: item}});
        continue;
      }
      if (item instanceof HtmlResponse) {
        raw.push({htmlResponse: item});
        continue;
      }
      raw.push(item);
    }
    return this;
  }

  /**
   * Adds a single suggestion or list of suggestions to list of items.
   * @public
   */
  addSuggestion(...suggestions: (string | Suggestions)[]) {
    if (!this.suggestions) {
      this.suggestions = [];
    }
    for (const suggestion of suggestions) {
      if (typeof suggestion === 'string') {
        this.addSuggestion(new Suggestions(suggestion));
        continue;
      }
      this.suggestions.push(...suggestion.suggestions);
    }
    return this;
  }
}