// src/app/services/login.service.ts
import { Injectable, NgZone } from "@angular/core";
import { HttpClient, HttpHeaders } from "@angular/common/http";
import {
  BehaviorSubject,
  Observable,
  of,
  Subject,
  timer,
  fromEvent,
  merge,
} from "rxjs";
import { jwtDecode } from "jwt-decode";
import { Router } from "@angular/router";
import { switchMap, debounceTime, mapTo, startWith } from "rxjs/operators";
import { AuthService } from "src/app/_services/auth.service";

const BASE_URL = "https://kapi.absys.ninja/hemat";
interface CustomJwtPayload {
  exp: number;
  scope: string;
  iat: number;
  preferred_username: string;
  name: string;
  email: string;
  family_name: string;
  given_name: string;
  sub: string;
}

@Injectable({
  providedIn: "root",
})
export class LoginService {
  private readonly tokenKey = "currentUser";
  private tabSelected = new BehaviorSubject<string | null>(null);
  public _tabSelected = this.tabSelected.asObservable();

  private activitySubject = new Subject<boolean>();
  public activity$: Observable<boolean> = this.activitySubject.asObservable();

  currentUser: any;

  constructor(
    private http: HttpClient,
    private router: Router,
    private authService: AuthService,
    private ngZone: NgZone
  ) {
    this.startTrackingActivity();
    this.startTokenCheck();
    this.currentUser = JSON.parse(localStorage.getItem("currentUser"));
  }

  setTabsSelected(e: string) {
    this.tabSelected.next(e);
  }

  updatePassword(data: any): Observable<any> {
    const endpoint = `/users`;
    const url = `${BASE_URL}${endpoint}/reset-password`;
    const headers = new HttpHeaders({
      "Content-Type": "application/json",
      "x-api-key": "j2yaYvPSQcsEEmHh3NEobfiXyyXmmnHT",
    });
    return this.http.put<any>(url, data, { headers });
  }

  getDataProfil(id: string): Observable<any> {
    const endpoint = `/users`;
    const url = `${BASE_URL}${endpoint}/byUserid/${id}`;
    const headers = new HttpHeaders({
      "Content-Type": "application/json",
      "x-api-key": "j2yaYvPSQcsEEmHh3NEobfiXyyXmmnHT",
    });
    return this.http.get<any>(url, { headers });
  }

  updateProfile(data: any, userId: string): Observable<any> {
    const endpoint = `/users`;
    const url = `${BASE_URL}${endpoint}/update/${userId}`;
    const headers = new HttpHeaders({
      "x-api-key": "j2yaYvPSQcsEEmHh3NEobfiXyyXmmnHT",
    });

    return this.http.post<any>(`${url}`, data, { headers });
  }

  updateUserProfile(data: any): Observable<any> {
    const body = { refresh_token: data };
    const endpoint = `/users`;
    const url = `${BASE_URL}${endpoint}/refresh-token`;
    const headers = new HttpHeaders({
      "x-api-key": "j2yaYvPSQcsEEmHh3NEobfiXyyXmmnHT",
    });

    return this.http.post<any>(`${url}`, body, { headers });
  }

  isTokenExpired(): Observable<boolean> {
    const tokenData = localStorage.getItem(this.tokenKey);
    if (tokenData) {
      const tokenInfo = JSON.parse(tokenData);
      const decodedToken = jwtDecode<CustomJwtPayload>(tokenInfo.refresh_token);
      const expiryDate = decodedToken.exp * 1000;
      const now = new Date().getTime();
      const timeLeft = expiryDate - now;
      return of(timeLeft <= 2 * 60 * 1000);
    }
    return of(true);
  }

  checkTokenAndRedirect(): void {
    this.isTokenExpired().subscribe((isExpired) => {
      if (isExpired) {
        this.authService.doLogout().then(
          () => {
            this.router.navigate(["/login"]);
            window.location.reload();
          },
          (err) => {
            console.log(err);
          }
        );
        this.router.navigate(["/login"]);
        window.location.reload();
      } else {
        console.log("Token is valid, continuing...");
      }
    });
  }

  startTokenCheck(): void {
    timer(0, 2 * 60 * 1000) // Check every 5 minutes
      .pipe(switchMap(() => this.isTokenExpired()))
      .subscribe((isExpired) => {
        // console.log(isExpired);

        if (isExpired) {
          this.activity$.subscribe((isActive) => {
            // console.log(isActive);

            if (!isActive) {
              this.checkTokenAndRedirect();
            } else {
              console.log(
                "Token expired but user is active. Refresh token not implemented."
              );

              this.updateUserProfile(this.currentUser.refresh_token).subscribe(
                (resp) => {
                  const decodedToken = jwtDecode<CustomJwtPayload>(
                    resp.access_token
                  );
                  localStorage.setItem(
                    "account_info",
                    JSON.stringify(decodedToken)
                  );
                  const userProfile = {
                    access_token: resp.access_token,
                    refresh_token: resp.refresh_token,
                    displayName: decodedToken.name,
                    buildingId: 4,
                  };
                  localStorage.setItem(
                    "currentUser",
                    JSON.stringify(userProfile)
                  );
                  window.location.reload();
                }
              );
            }
          });
        }
      });
  }

  startTrackingActivity(): void {
    this.ngZone.runOutsideAngular(() => {
      const activityEvents$ = merge(
        fromEvent(window, "mousemove"),
        fromEvent(window, "click"),
        fromEvent(window, "keypress"),
        fromEvent(window, "scroll")
      );

      activityEvents$
        .pipe(
          startWith(null),
          switchMap(() =>
            merge(
              timer(0).pipe(mapTo(true)),
              timer(5 * 60 * 1000).pipe(mapTo(false)) // 5 minutes of inactivity
            )
          ),
          debounceTime(300)
        )
        .subscribe((active) => {
          this.ngZone.run(() => this.activitySubject.next(active));
        });
    });
  }
}