import { NativeModules, Platform } from 'react-native';
import { sha256 } from 'react-native-sha256';

// const LINKING_ERROR =
//   `The package 'react-native-b8safe' doesn't seem to be linked. Make sure: \n\n` +
//   Platform.select({ ios: "- You have run 'pod install'\n", default: '' }) +
//   '- You rebuilt the app after installing the package\n' +
//   '- You are not using Expo Go\n';

const DeviceCheck =
  NativeModules.DeviceCheck !== undefined
    ? (NativeModules.DeviceCheck as TDeviceCheck)
    : null;

const PlayIntegrity =
  NativeModules.PlayIntegrity !== undefined
    ? (NativeModules.PlayIntegrity as TPlayIntegrity)
    : null;

function generateRandomString(length: number): string {
  const characters =
    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  let result = '';
  const charactersLength = characters.length;
  for (let i = 0; i < length; i++)
    result += characters.charAt(Math.floor(Math.random() * charactersLength));

  return result;
}

export const getToken = async (
  payload?: object,
  type?: TokenType
): Promise<string | null> => {
  try {
    type = type ?? 'standard';
    if (Platform.OS === 'android') {
      const isAvailable = await PlayIntegrity?.isPlayIntegrityAvailable();
      if (isAvailable) {
        if (type === 'classic') {
          const nonce = await sha256(JSON.stringify(payload ?? {}));
          const base64Nonce = new Buffer(nonce).toString('base64');
          return [
            await PlayIntegrity?.requestIntegrityToken(base64Nonce, null),
            nonce,
          ].join('|');
        } else {
          try {
            const isPrepared =
              await PlayIntegrity?.isStandardIntegrityTokenProviderPrepared();
            if (isPrepared) {
              const hash = generateRandomString(64);
              return [
                await PlayIntegrity?.requestStandardIntegrityToken(hash),
                hash,
              ].join('|');
            }
          } catch (e) {
            console.error('Erro ao obter o token de integridade padrão:', e);
          }
        }
      }
      return null;
    } else if (DeviceCheck !== null) {
      return await DeviceCheck.getDeviceToken();
    }
  } catch (e) {
    console.error('Erro ao obter o token de integridade:', e);
  }
  return null;
};