/* eslint-disable class-methods-use-this */
import { TokenPayload, PKCEData } from '../types';
import { decodeJwtPayload } from '../utils/jwt';

const KEY_PKCE_STATE = 'pkce_state';
const KEY_PKCE_VERIFIER = 'pkce_verifier';
const validCredentialsMinTtlSec = 3600; // 1 hour

export default class DeviceCredentialsManager {
  private isTokenValid(jwt: string): boolean {
    try {
      const tokenPayload: TokenPayload = decodeJwtPayload(jwt);
      const expiresAt = tokenPayload.exp ?? 0;
      const now = (Date.now() / 1000) + validCredentialsMinTtlSec;
      return expiresAt > now;
    } catch (error) {
      return false;
    }
  }

  public savePKCEData(data: PKCEData) {
    localStorage.setItem(KEY_PKCE_STATE, data.state);
    localStorage.setItem(KEY_PKCE_VERIFIER, data.verifier);
  }

  public getPKCEData(): PKCEData | null {
    const state = localStorage.getItem(KEY_PKCE_STATE);
    const verifier = localStorage.getItem(KEY_PKCE_VERIFIER);
    if (state && verifier) {
      return { state, verifier };
    }
    return null;
  }
}