import { Inject, Injectable } from '@angular/core';
import { OKTA_AUTH } from '@okta/okta-angular';
import OktaAuth from '@okta/okta-auth-js';

@Injectable({
  providedIn: 'root'
})
export class OktaTokenService {
  private employeeNumber: number = -1;
  private accessToken: string = '';
  tokenExpiredInterval: any;
  userName: string | undefined = '';


  constructor(@Inject(OKTA_AUTH) private oktaAuth: OktaAuth) { }

  setAccessToken(accessToken: string) {
    this.accessToken = accessToken;
  }

  getAccessToken() {
    return this.oktaAuth.getAccessToken() as string;
  }
  setEmployeeNumber(employeeNumber: number) {
    this.employeeNumber = employeeNumber
  }
  getEmployeeNumber(): number {
    return this.employeeNumber;
  }

  hasTokenExpired() {
    this.tokenExpiredInterval = setInterval(() => {
      var accessToken = this.oktaAuth.getAccessToken() as string;
      if (accessToken !== null || accessToken !== "" || accessToken !== undefined) {
        const currentDateTime: string = this.getCurrentDateTime();
        const expiryTime: string = this.convertUnixTimestampToDateTime(this.getExpiryTime(accessToken));
        if (expiryTime < currentDateTime) {
          this.oktaAuth.signOut();
          clearInterval(this.tokenExpiredInterval);
        }
      } else {
        this.oktaAuth.signOut();
        clearInterval(this.tokenExpiredInterval);
      }
    }, 2000);
   
  }

  getCurrentDateTime(): string {
    const now = new Date();
    const year = now.getFullYear();
    const month = String(now.getMonth() + 1).padStart(2, '0'); // Month is 0-based, so we add 1
    const day = String(now.getDate()).padStart(2, '0');
    const hours = String(now.getHours()).padStart(2, '0');
    const minutes = String(now.getMinutes()).padStart(2, '0');
    const seconds = String(now.getSeconds()).padStart(2, '0');
    return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
  }
  convertUnixTimestampToDateTime(unixTimestamp: number): string {
    const date = new Date(unixTimestamp * 1000); // Convert Unix timestamp to milliseconds
    const year = date.getFullYear();
    const month = (date.getMonth() + 1).toString().padStart(2, '0');
    const day = date.getDate().toString().padStart(2, '0');
    const hours = date.getHours().toString().padStart(2, '0');
    const minutes = date.getMinutes().toString().padStart(2, '0');
    const seconds = date.getSeconds().toString().padStart(2, '0');
    return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
  }

  getExpiryTime(accessToken: string) {
    var base64Url: string = accessToken.split('.')[1];
    var base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
    var jsonPayload: string = decodeURIComponent(window.atob(base64).split('').map(function (c) {
      return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
    }).join(''));
    let parsedPayload: any;
    try {
      parsedPayload = JSON.parse(jsonPayload);
      return parsedPayload["exp"];
    } catch (error) {
      console.error("Error parsing JSON payload:", error);
    }
  }


}