import { Injectable } from '@angular/core';
import { MatLegacyDialog as MatDialog } from '@angular/material/legacy-dialog';
import { Request, UnaryInterceptor, UnaryResponse } from 'grpc-web';
import { Subject } from 'rxjs';
import { debounceTime, filter, first, take } from 'rxjs/operators';
import { WarnDialogComponent } from 'src/app/modules/warn-dialog/warn-dialog.component';

import { AuthenticationService } from '../authentication.service';
import { StorageService } from '../storage.service';

const authorizationKey = 'Authorization';
const bearerPrefix = 'Bearer';
const accessTokenStorageKey = 'access_token';
@Injectable({ providedIn: 'root' })
/**
 * Set the authentication token
 */
export class AuthInterceptor<TReq = unknown, TResp = unknown> implements UnaryInterceptor<TReq, TResp> {
  public triggerDialog: Subject<boolean> = new Subject();
  constructor(
    private authenticationService: AuthenticationService,
    private storageService: StorageService,
    private dialog: MatDialog,
  ) {
    this.triggerDialog.pipe(debounceTime(1000)).subscribe(() => {
      this.openDialog();
    });
  }

  public async intercept(request: Request<TReq, TResp>, invoker: any): Promise<UnaryResponse<TReq, TResp>> {
    await this.authenticationService.authenticationChanged
      .pipe(
        filter((authed) => !!authed),
        first(),
      )
      .toPromise();

    const metadata = request.getMetadata();
    const accessToken = this.storageService.getItem(accessTokenStorageKey);
    metadata[authorizationKey] = `${bearerPrefix} ${accessToken}`;

    return invoker(request)
      .then((response: any) => {
        return response;
      })
      .catch(async (error: any) => {
        if (error.code === 16) {
          this.triggerDialog.next(true);
        }
        return Promise.reject(error);
      });
  }

  private openDialog(): void {
    const dialogRef = this.dialog.open(WarnDialogComponent, {
      data: {
        confirmKey: 'ACTIONS.LOGIN',
        titleKey: 'ERRORS.TOKENINVALID.TITLE',
        descriptionKey: 'ERRORS.TOKENINVALID.DESCRIPTION',
      },
      disableClose: true,
      width: '400px',
    });

    dialogRef
      .afterClosed()
      .pipe(take(1))
      .subscribe((resp) => {
        if (resp) {
          this.authenticationService.authenticate(undefined, true);
        }
      });
  }
}