import * as Keychain from 'react-native-keychain';
import { KEYCHAIN } from '../utils/constants';

class KeychainService {
  /**
   * Save access token securely
   */
  async saveToken(token: string): Promise<boolean> {
    try {
      const result = await Keychain.setGenericPassword(
        KEYCHAIN.USERNAME,
        token,
        {
          service: KEYCHAIN.SERVICE,
          accessible: Keychain.ACCESSIBLE.WHEN_UNLOCKED,
        },
      );
      return !!result;
    } catch (error) {
      console.log('Keychain Save Error', error);
      return false;
    }
  }

  /**
   * Get stored token
   */
  async getToken(): Promise<string | null> {
    try {
      const credentials = await Keychain.getGenericPassword({
        service: KEYCHAIN.SERVICE,
      });

      if (!credentials) {
        return null;
      }

      return credentials.password;
    } catch (error) {
      console.log('Keychain Get Error', error);
      return null;
    }
  }

  /**
   * Check whether token exists
   */
  async hasToken(): Promise<boolean> {
    const token = await this.getToken();
    return !!token;
  }

  /**
   * Remove token
   */
  async removeToken(): Promise<boolean> {
    try {
      return await Keychain.resetGenericPassword({
        service: KEYCHAIN.SERVICE,
      });
    } catch (error) {
      console.log('Keychain Remove Error', error);
      return false;
    }
  }

  /**
   * Save mock token for testing
   */
  async mockLogin(): Promise<boolean> {
    return this.saveToken('mock-access-token');
  }
}

export default new KeychainService();