import {inject, Injectable, Signal, signal} from "@angular/core";
import {PublicationRestService} from "../../core/rest-services/publications/publication.rest-service";
import {AuthenticationService} from "../../core/service/authentication.service";
import {Publication} from "../../core/rest-services/publications/model/publication";
import {Router} from "@angular/router";
import {MatSnackBar} from "@angular/material/snack-bar";

@Injectable()
export class MyPublicationsService {
  readonly #authenticationService = inject(AuthenticationService);
  readonly #publicationRestService = inject(PublicationRestService);
  readonly #snackBar = inject(MatSnackBar);
  readonly #router = inject(Router);
  #publications = signal<Publication[]>([]);
  #isLoading = signal(false);
  #isLoaded = signal(false);

  get publications(): Signal<Publication[]> {
    return this.#publications.asReadonly();
  }

  get isLoading(): Signal<boolean> {
    return this.#isLoading.asReadonly();
  }

  get isLoaded(): Signal<boolean> {
    return this.#isLoaded.asReadonly();
  }

  loadAuthenticatedUserPublications(): void {
    const authenticatedUser = this.#authenticationService.getAuthenticatedUser();
    if (authenticatedUser) {
      this.#isLoading.set(true);
      this.#isLoaded.set(false);

      const query = `author_id=${authenticatedUser.id}`;
      this.#publicationRestService.search(query)
        .then(publications => {
          this.#publications.set(publications);
        })
        .catch(error => {
          const errorMessage = $localize`An error occurred while retrieving your publications...`;
          this.#snackBar.open(errorMessage, $localize`Close`, {duration: 5000});
          console.error(errorMessage, error);
        })
        .finally(() => {
          this.#isLoading.set(false);
          this.#isLoaded.set(true);
        });
    } else {
      this.#authenticationService.unauthenticate();
      this.#snackBar.open($localize`You are unauthenticated. Please, log-in first.`, $localize`Close`, {duration: 5000});
      this.#router.navigate(['/login']);
    }
  }
}