import { Subject } from 'rxjs';
import {
  X_FRAMEWORK_PUSH_SERVICE_CONFIG,
  X_FRAMEWORK_PUSH_SERVICE_TOKEN_FETCHER,
} from '../tokens/x-injectable-tokens';
import { isString } from 'x-framework-core';
import { XBasePushService } from './x-base-push.service';
import { Inject, Injectable, Optional } from '@angular/core';
import { XWebRTCAction } from '../typings/x-push-notification.typings';
import { IXPushServiceTokenFetcher } from '../policies/x-push-service-token-fetcher';
import { XFrameworkPushServiceConfig } from '../config/x-framework-push-service.config';

@Injectable()
export abstract class XBaseWebRTCService extends XBasePushService {
  //
  //#region Props ...
  public onOfferRecieved$ = new Subject<any>();
  public onAnswerRecieved$ = new Subject<{
    answer: any;
    requesterId: string;
  }>();
  public onCandidateRecieved$ = new Subject<{
    candidate: any;
    senderId: string;
  }>();
  //#endregion

  //
  //#region Constructor ...
  constructor(
    //
    @Inject(X_FRAMEWORK_PUSH_SERVICE_CONFIG)
    public config: XFrameworkPushServiceConfig,

    //
    @Optional()
    @Inject(X_FRAMEWORK_PUSH_SERVICE_TOKEN_FETCHER)
    public tokenFetcher?: IXPushServiceTokenFetcher
  ) {
    super(config, tokenFetcher);
  }
  //#endregion

  //
  //#region Actions ...
  public async offer(offer: any, to: string) {
    //
    if (!isString(offer)) {
      offer = JSON.stringify(offer);
    }

    //
    await this.invoke(XWebRTCAction.Offer, offer, to);
  }

  public async answer(answer: any) {
    //
    if (!isString(answer)) {
      answer = JSON.stringify(answer);
    }

    //
    await this.invoke(XWebRTCAction.Answer, answer);
  }

  public async candidate(candidate: any, to: string) {
    //
    if (!isString(candidate)) {
      candidate = JSON.stringify(candidate);
    }

    //
    await this.invoke(XWebRTCAction.Candidate, candidate, to);
  }
  //#endregion

  /**
   * Register All Available
   */
  registerSubjects(): void {
    super.registerSubjects();

    //
    this.onOfferRecieved((offer: any) => {
      this.onOfferRecieved$.next(offer);
    });

    //
    this.onAnswerRecieved((answer: any, requesterId: string) => {
      this.onAnswerRecieved$.next({ answer, requesterId });
    });

    //
    this.onCandidateRecieved((candidate: any, senderId: string) => {
      this.onCandidateRecieved$.next({ candidate, senderId });
    });
  }

  //
  //#region Event Handler Attaches ...
  public onOfferRecieved(callback: (offer: any) => any) {
    this.on(XWebRTCAction.Offer, callback);
  }

  public onAnswerRecieved(callback: (answer: any, requesterId: string) => any) {
    this.on(XWebRTCAction.Answer, callback);
  }

  public onCandidateRecieved(
    callback: (candidate: any, senderId: string) => any
  ) {
    this.on(XWebRTCAction.Candidate, callback);
  }
  //#endregion

  //
  //#region Event Handler Detachers ...
  public offOfferRecieved(callback?: (offer: any) => any) {
    this.off(XWebRTCAction.Offer, callback);
  }

  public offAnswerRecieved(
    callback?: (answer: any, requesterId: string) => any
  ) {
    this.off(XWebRTCAction.Answer, callback);
  }

  public offCandidateRecieved(
    callback?: (candidate: any, senderId: string) => any
  ) {
    this.off(XWebRTCAction.Candidate, callback);
  }
  //#endregion
}