import {
  HttpInterceptorFn,
  HttpRequest,
  HttpHandlerFn,
  HttpEvent,
  HttpErrorResponse,
} from '@angular/common/http';
import { Observable, from, throwError } from 'rxjs';
import { catchError, switchMap } from 'rxjs/operators';
import { inject } from '@angular/core';
import { CookiesService } from './services/cookies/cookies.service';
import { ModalService } from './services/modal/modal.service';
import { Router } from '@angular/router';

export const AuthInterceptor: HttpInterceptorFn = (
  req: HttpRequest<unknown>,
  next: HttpHandlerFn
): Observable<HttpEvent<unknown>> => {
  // Exclure l'endpoint de refresh token pour éviter la récursion infinie
  if (req.url.includes('/refresh-token')) {
    return next(req);
  }

  const cookiesService = inject(CookiesService);
  const router = inject(Router);
  const modalService = inject(ModalService);
  
  return from(cookiesService.getValidToken()).pipe(
    switchMap((token) => {
      const authReq = token
        ? req.clone({
            setHeaders: { Authorization: `Bearer ${token}` },
          })
        : req;

      return next(authReq);
    }),
    catchError((err: HttpErrorResponse) => {
      if (err.status === 401) {
        cookiesService.clearSession();
        router.navigate(['/']).then(() => {
          modalService.openModal('login-modal');
        });
      }
      return throwError(() => err);
    })
  );
};