import {Injectable} from '@angular/core';
import {Observable, Subject} from 'rxjs';
import {WindowService} from './window.service';

@Injectable({
  providedIn: 'root'
})
export class PatientContextService {
  private currentCpr: string | undefined;
  private currentEpisodeOfCare: string | undefined;
  private readonly innerCpr: Subject<string | undefined> = new Subject();
  private readonly innerEpisodeOfCare: Subject<string | undefined> = new Subject();


  constructor(private windowService: WindowService) {
    const cpr = this.windowService.nativeWindow().localStorage.getItem(`${this.windowService.nativeWindow().document.cookie}_patient_context_cpr`);
    const episodeOfCare = this.windowService.nativeWindow().localStorage.getItem(`${this.windowService.nativeWindow().document.cookie}_patient_context_eoc`);
    if (cpr) {
      this.setCpr(cpr);
    }
    if (episodeOfCare) {
      this.setEpisodeOfCare(episodeOfCare);
    }
  }

  public setCpr(cpr?: string): void {
    if (this.currentCpr !== cpr) {
      this.currentCpr = cpr;
      this.windowService.nativeWindow().localStorage.setItem(
        `${this.windowService.nativeWindow().document.cookie}_patient_context_cpr`,
        cpr || ''
      );
      this.innerCpr.next(cpr);
      this.setEpisodeOfCare(undefined);
    }
  }

  public getCurrentCpr(): string | undefined {
    return this.currentCpr;
  }

  public setEpisodeOfCare(episodeOfCareIdentifier?: string): void {
    if (this.currentEpisodeOfCare !== episodeOfCareIdentifier) {
      this.currentEpisodeOfCare = episodeOfCareIdentifier;
      this.windowService.nativeWindow().localStorage.setItem(
        `${this.windowService.nativeWindow().document.cookie}_patient_context_eoc`,
        episodeOfCareIdentifier || ''
      );
      this.innerEpisodeOfCare.next(episodeOfCareIdentifier);
    }
  }

  public getCurrentEpisodeOfCare(): string | undefined {
    return this.currentEpisodeOfCare;
  }

  get cpr$(): Observable<string | undefined> {
    return this.innerCpr;
  }

  get episodeOfCare$(): Observable<string | undefined> {
    return this.innerEpisodeOfCare;
  }
}