/**
 * 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 {Headers} from '../../../framework';
import {Surface, Available} from './surface';
import {User} from './user';
import {
  Image,
  BasicCard,
  RichResponse,
  Suggestions,
  RichResponseItem,
  MediaObject,
  MediaResponse,
  SimpleResponse,
  Table,
  BrowseCarousel,
  OrderUpdate,
  LinkOutSuggestion,
} from './response';
import {
  Helper,
  SoloHelper,
  TransactionDecision,
  TransactionRequirements,
} from './helper';
import {Arguments} from './argument';
import {Device} from './device';
import {Input} from './input';
import {JsonObject} from '../../../common';
import {ServiceBaseApp, AppOptions} from '../../../assistant';
import {OAuth2Client} from 'google-auth-library';
import {Canvas} from './canvas';

/** @public */
export type Intent =
  | 'actions.intent.MAIN'
  | 'actions.intent.TEXT'
  | 'actions.intent.PERMISSION'
  | 'actions.intent.OPTION'
  | 'actions.intent.TRANSACTION_REQUIREMENTS_CHECK'
  | 'actions.intent.DELIVERY_ADDRESS'
  | 'actions.intent.TRANSACTION_DECISION'
  | 'actions.intent.CONFIRMATION'
  | 'actions.intent.DATETIME'
  | 'actions.intent.SIGN_IN'
  | 'actions.intent.NO_INPUT'
  | 'actions.intent.CANCEL'
  | 'actions.intent.NEW_SURFACE'
  | 'actions.intent.REGISTER_UPDATE'
  | 'actions.intent.CONFIGURE_UPDATES'
  | 'actions.intent.PLACE'
  | 'actions.intent.LINK'
  | 'actions.intent.MEDIA_STATUS'
  | 'actions.intent.COMPLETE_PURCHASE'
  | 'actions.intent.DIGITAL_PURCHASE_CHECK';

/** @hidden */
export type InputValueSpec =
  | 'type.googleapis.com/google.actions.v2.PermissionValueSpec'
  | 'type.googleapis.com/google.actions.v2.OptionValueSpec'
  | 'type.googleapis.com/google.actions.v2.TransactionRequirementsCheckSpec'
  | 'type.googleapis.com/google.actions.v2.DeliveryAddressValueSpec'
  | 'type.googleapis.com/google.actions.v2.TransactionDecisionValueSpec'
  | 'type.googleapis.com/google.actions.v2.ConfirmationValueSpec'
  | 'type.googleapis.com/google.actions.v2.DateTimeValueSpec'
  | 'type.googleapis.com/google.actions.v2.NewSurfaceValueSpec'
  | 'type.googleapis.com/google.actions.v2.RegisterUpdateValueSpec'
  | 'type.googleapis.com/google.actions.v2.SignInValueSpec'
  | 'type.googleapis.com/google.actions.v2.PlaceValueSpec'
  | 'type.googleapis.com/google.actions.v2.LinkValueSpec'
  | 'type.googleapis.com/google.actions.transactions.v3.CompletePurchaseValueSpec'
  | 'type.googleapis.com/google.actions.transactions.v3.TransactionDecisionValueSpec'
  | 'type.googleapis.com/google.actions.transactions.v3.TransactionRequirementsCheckSpec'
  | 'type.googleapis.com/google.actions.transactions.v3.DigitalPurchaseCheckSpec';

/** @hidden */
export type DialogSpec =
  | 'type.googleapis.com/google.actions.v2.PlaceValueSpec.PlaceDialogSpec'
  | 'type.googleapis.com/google.actions.v2.LinkValueSpec.LinkDialogSpec';

/** @public */
export type Response =
  | RichResponse
  | RichResponseItem
  | Image
  | Suggestions
  | MediaObject
  | Helper<Intent, JsonObject>;

/** @hidden */
export interface ConversationResponse {
  richResponse: Api.GoogleActionsV2RichResponse;
  expectUserResponse: boolean;
  userStorage: string;
  expectedIntent?: Api.GoogleActionsV2ExpectedIntent;
  noInputPrompts?: Api.GoogleActionsV2SimpleResponse[];
  speechBiasingHints?: string[];
}

export interface ConversationOptionsInit<TConvData, TUserStorage> {
  /** @public */
  data?: TConvData;

  /** @public */
  storage?: TUserStorage;
}

/** @hidden */
export interface ConversationBaseOptions<TConvData, TUserStorage> {
  /** @public */
  headers?: Headers;

  /** @public */
  init?: ConversationOptionsInit<TConvData, TUserStorage>;

  /** @public */
  debug?: boolean;

  /** @public */
  ordersv3?: boolean;
}

/** @hidden */
export interface ConversationOptions<TUserStorage> {
  /** @public */
  request?: Api.GoogleActionsV2AppRequest;

  /** @public */
  headers?: Headers;

  /** @public */
  init?: ConversationOptionsInit<{}, TUserStorage>;

  /** @public */
  ordersv3?: boolean;
}

/**
 * Throw an UnauthorizedError in an intent handler to make the library
 * respond with a HTTP 401 Status Code.
 *
 * @example
 * ```javascript
 * const app = dialogflow()
 *
 * // If using Actions SDK:
 * // const app = actionssdk()
 *
 * app.intent('intent', conv => {
 *   // ...
 *
 *   // given a function to check if a user auth is still valid
 *   const valid = checkUserAuthValid(conv)
 *   if (!valid) {
 *     throw new UnauthorizedError()
 *   }
 *
 *   // ...
 * })
 *
 * ```
 *
 * @public
 */
export class UnauthorizedError extends Error {}

/** @public */
export class Conversation<TUserStorage> {
  /** @public */
  request: Api.GoogleActionsV2AppRequest;

  /** @public */
  headers: Headers;

  /** @public */
  responses: Response[] = [];

  /** @public */
  expectUserResponse = true;

  /** @public */
  surface: Surface;

  /** @public */
  available: Available;

  /** @public */
  digested = false;

  /**
   * True if the app is being tested in sandbox mode. Enable sandbox
   * mode in the [Actions console](console.actions.google.com) to test
   * transactions.
   * @public
   */
  sandbox: boolean;

  /** @public */
  input: Input;

  /**
   * Gets the {@link User} object.
   * The user object contains information about the user, including
   * a string identifier and personal information (requires requesting permissions,
   * see {@link Permission|conv.ask(new Permission)}).
   * @public
   */
  user: User<TUserStorage>;

  /** @public */
  arguments: Arguments;

  /** @public */
  device: Device;

  /** @public */
  canvas: Canvas;

  /**
   * Gets the unique conversation ID. It's a new ID for the initial query,
   * and stays the same until the end of the conversation.
   *
   * @example
   * ```javascript
   *
   * app.intent('actions.intent.MAIN', conv => {
   *   const conversationId = conv.id
   * })
   * ```
   *
   * @public
   */
  id: string;

  /** @public */
  type: Api.GoogleActionsV2ConversationType;

  /**
   * Shortcut for
   * {@link Capabilities|conv.surface.capabilities.has('actions.capability.SCREEN_OUTPUT')}
   * @public
   */
  screen: boolean;

  /**
   * Set reprompts when users don't provide input to this action (no-input errors).
   * Each reprompt represents as the {@link SimpleResponse}, but raw strings also can be specified
   * for convenience (they're passed to the constructor of {@link SimpleResponse}).
   * Notice that this value is not kept over conversations. Thus, it is necessary to set
   * the reprompts per each conversation response.
   *
   * @example
   * ```javascript
   *
   * app.intent('actions.intent.MAIN', conv => {
   *   conv.noInputs = [
   *     'Are you still there?',
   *     'Hello?',
   *     new SimpleResponse({
   *       text: 'Talk to you later. Bye!',
   *       speech: '<speak>Talk to you later. Bye!</speak>'
   *     })
   *   ]
   *   conv.ask('What's your favorite color?')
   * })
   * ```
   *
   * @public
   */
  noInputs: (string | SimpleResponse)[] = [];

  /**
   * Sets speech biasing options.
   *
   * @example
   * ``` javascript
   *
   * app.intent('actions.intent.MAIN', conv => {
   *   conv.speechBiasing = ['red', 'blue', 'green']
   *   conv.ask('What is your favorite color out of red, blue, and green?')
   * })
   * ```
   *
   * @public
   */
  speechBiasing: string[] = [];

  /** @hidden */
  _raw?: JsonObject;

  /** @hidden */
  _responded = false;

  /** @hidden */
  _init: ConversationOptionsInit<{}, TUserStorage>;

  /** @hidden */
  _ordersv3 = false;

  /** @hidden */
  constructor(options: ConversationOptions<TUserStorage> = {}) {
    const {request = {}, headers = {}, init = {}, ordersv3 = false} = options;

    this.request = request;
    this.headers = headers;
    this._init = init;
    this._ordersv3 = ordersv3;

    this.sandbox = !!this.request.isInSandbox;

    const {inputs = [], conversation = {}} = this.request;
    const [input = {}] = inputs;
    const {rawInputs = []} = input;

    this.input = new Input(rawInputs[0]);
    this.surface = new Surface(this.request.surface);
    this.available = new Available(this.request.availableSurfaces);

    this.user = new User(this.request.user, this._init.storage);

    this.arguments = new Arguments(input.arguments);

    this.device = new Device(this.request.device);

    this.canvas = new Canvas(input);

    this.id = conversation.conversationId!;

    this.type = conversation.type!;

    this.screen = this.surface.capabilities.has(
      'actions.capability.SCREEN_OUTPUT'
    );
  }

  /** @public */
  json<T = JsonObject>(json: T) {
    this._raw = json;
    this._responded = true;
    return this;
  }

  /** @public */
  add(...responses: Response[]) {
    if (this.digested) {
      throw new Error(
        'Response has already been sent. ' +
          'Is this being used in an async call that was not ' +
          'returned as a promise to the intent handler?'
      );
    }
    this.responses.push(...responses);
    this._responded = true;
    return this;
  }

  /**
   * Asks to collect user's input. All user's queries need to be sent to the app.
   * {@link https://developers.google.com/actions/policies/general-policies#user_experience|
   *     The guidelines when prompting the user for a response must be followed at all times}.
   *
   * @example
   * ```javascript
   *
   * // Actions SDK
   * const app = actionssdk()
   *
   * app.intent('actions.intent.MAIN', conv => {
   *   const ssml = '<speak>Hi! <break time="1"/> ' +
   *     'I can read out an ordinal like <say-as interpret-as="ordinal">123</say-as>. ' +
   *     'Say a number.</speak>'
   *   conv.ask(ssml)
   * })
   *
   * app.intent('actions.intent.TEXT', (conv, input) => {
   *   if (input === 'bye') {
   *     return conv.close('Goodbye!')
   *   }
   *   const ssml = `<speak>You said, <say-as interpret-as="ordinal">${input}</say-as></speak>`
   *   conv.ask(ssml)
   * })
   *
   * // Dialogflow
   * const app = dialogflow()
   *
   * app.intent('Default Welcome Intent', conv => {
   *   conv.ask('Welcome to action snippets! Say a number.')
   * })
   *
   * app.intent('Number Input', (conv, {num}) => {
   *   conv.close(`You said ${num}`)
   * })
   * ```
   *
   * @param responses A response fragment for the library to construct a single complete response
   * @public
   */
  ask(...responses: Response[]) {
    this.expectUserResponse = true;
    return this.add(...responses);
  }

  /**
   * Have Assistant render the speech response and close the mic.
   *
   * @example
   * ```javascript
   *
   * // Actions SDK
   * const app = actionssdk()
   *
   * app.intent('actions.intent.MAIN', conv => {
   *   const ssml = '<speak>Hi! <break time="1"/> ' +
   *     'I can read out an ordinal like <say-as interpret-as="ordinal">123</say-as>. ' +
   *     'Say a number.</speak>'
   *   conv.ask(ssml)
   * })
   *
   * app.intent('actions.intent.TEXT', (conv, input) => {
   *   if (input === 'bye') {
   *     return conv.close('Goodbye!')
   *   }
   *   const ssml = `<speak>You said, <say-as interpret-as="ordinal">${input}</say-as></speak>`
   *   conv.ask(ssml)
   * })
   *
   * // Dialogflow
   * const app = dialogflow()
   *
   * app.intent('Default Welcome Intent', conv => {
   *   conv.ask('Welcome to action snippets! Say a number.')
   * })
   *
   * app.intent('Number Input', (conv, {num}) => {
   *   conv.close(`You said ${num}`)
   * })
   * ```
   *
   * @param responses A response fragment for the library to construct a single complete response
   * @public
   */
  close(...responses: Response[]) {
    this.expectUserResponse = false;
    return this.add(...responses);
  }

  /** @public */
  response(): ConversationResponse {
    if (!this._responded) {
      throw new Error(
        'No response has been set. ' +
          'Is this being used in an async call that was not ' +
          'returned as a promise to the intent handler?'
      );
    }
    if (this.digested) {
      throw new Error('Response has already been digested');
    }
    this.digested = true;
    const {expectUserResponse} = this;
    let richResponse = new RichResponse();
    let expectedIntent: Api.GoogleActionsV2ExpectedIntent | undefined;
    let requireSimpleResponse = false;
    for (const response of this.responses) {
      if (typeof response === 'string') {
        richResponse.add(response);
        continue;
      }
      if (response instanceof Helper) {
        if (!(response instanceof SoloHelper)) {
          requireSimpleResponse = true;
        }
        if (this._ordersv3) {
          let type: InputValueSpec | null = null;
          if (response instanceof TransactionDecision) {
            type =
              'type.googleapis.com/google.actions.transactions.v3.TransactionDecisionValueSpec';
          } else if (response instanceof TransactionRequirements) {
            type =
              'type.googleapis.com/google.actions.transactions.v3.TransactionRequirementsCheckSpec';
          }
          if (type !== null) {
            response.inputValueData['@type'] = type;
          }
        }
        expectedIntent = response;
        continue;
      }
      if (response instanceof RichResponse) {
        richResponse = response;
        continue;
      }
      if (response instanceof Suggestions) {
        requireSimpleResponse = true;
        richResponse.addSuggestion(response);
        continue;
      }
      if (response instanceof Image) {
        requireSimpleResponse = true;
        richResponse.add(new BasicCard({image: response}));
        continue;
      }
      if (response instanceof MediaObject) {
        requireSimpleResponse = true;
        richResponse.add(new MediaResponse(response));
        continue;
      }
      if (
        response instanceof BasicCard ||
        response instanceof Table ||
        response instanceof BrowseCarousel ||
        response instanceof MediaResponse ||
        response instanceof OrderUpdate ||
        response instanceof LinkOutSuggestion
      ) {
        requireSimpleResponse = true;
        richResponse.add(response);
        continue;
      }
      richResponse.add(response);
    }
    if (this._ordersv3) {
      for (const response of richResponse.items!) {
        const {structuredResponse} = response;
        if (structuredResponse && structuredResponse.orderUpdate) {
          response.structuredResponse = {
            orderUpdateV3: structuredResponse.orderUpdate,
          };
        }
      }
    }
    let hasSimpleResponse = false;
    for (const response of richResponse.items!) {
      if (response.simpleResponse) {
        hasSimpleResponse = true;
        break;
      }
    }
    if (requireSimpleResponse && !hasSimpleResponse) {
      throw new Error(
        'A simple response is required in addition to this type of response'
      );
    }
    const userStorageIn = new User(
      this.user.raw,
      this._init.storage
    )._serialize();
    const userStorageOut = this.user._serialize();
    const userStorage = userStorageOut === userStorageIn ? '' : userStorageOut;
    const response: ConversationResponse = {
      expectUserResponse,
      richResponse,
      userStorage,
      expectedIntent,
    };
    if (this.noInputs.length > 0) {
      response.noInputPrompts = this.noInputs.map(prompt => {
        return typeof prompt === 'string' ? new SimpleResponse(prompt) : prompt;
      });
    }
    if (this.speechBiasing.length > 0) {
      response.speechBiasingHints = this.speechBiasing;
    }
    return response;
  }
}

export interface ExceptionHandler<
  TUserStorage,
  TConversation extends Conversation<TUserStorage>
> {
  /** @public */
  // tslint:disable-next-line:no-any allow to return any just detect if is promise
  (conv: TConversation, error: Error): Promise<any> | any;
}

/** @hidden */
export interface Traversed {
  [key: string]: boolean;
}

/** @hidden */
export interface ConversationAppOptions<TConvData, TUserStorage>
  extends AppOptions {
  /** @public */
  init?: () => ConversationOptionsInit<TConvData, TUserStorage>;

  /**
   * Client ID for User Profile Payload Verification
   * See {@link Profile#payload|conv.user.profile.payload}
   * @public
   */
  clientId?: string;

  /** @public */
  ordersv3?: boolean;
}

export interface OAuth2ConfigClient {
  /** @public */
  id: string;
}

export interface OAuth2Config {
  /** @public */
  client: OAuth2ConfigClient;
}

export interface ConversationApp<TConvData, TUserStorage>
  extends ServiceBaseApp {
  /** @public */
  init?: () => ConversationOptionsInit<TConvData, TUserStorage>;

  /** @public */
  auth?: OAuth2Config;

  /** @public */
  ordersv3: boolean;

  /** @hidden */
  _client?: OAuth2Client;
}