import CryptoJS from 'crypto-js';
import { Platform } from 'react-native';

const generateIV = () => {
    if (Platform.OS === 'web') {
      // For web, use CryptoJS's random generator
      return CryptoJS.lib.WordArray.random(16);
    } else {
      // For React Native, use a simple random number generator
      const arr = new Uint8Array(16);
      for (let i = 0; i < 16; i++) {
        arr[i] = Math.floor(Math.random() * 256);
      }
      return CryptoJS.lib.WordArray.create(arr);
    }
  };
  
  const encrypt = (plaintext) => {
    const encryptScreteKey = 'b305723a4d2e49a443e064a111e3e280';
    const iv = generateIV();
    const key = CryptoJS.enc.Utf8.parse(encryptScreteKey);
    
    const encrypted = CryptoJS.AES.encrypt(plaintext, key, {
      iv: iv,
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.Pkcs7
    });
  
    const encryptedBase64 = encrypted.toString();
    const ivHex = CryptoJS.enc.Hex.stringify(iv);
  
    return `${ivHex}:${encryptedBase64}`;
  };
  
  const decrypt = (encryptedData) => {
    const encryptScreteKey = 'b305723a4d2e49a443e064a111e3e280';
    const [iv, encrypted] = encryptedData.split(':');
    const ivBytes = CryptoJS.enc.Hex.parse(iv);
    const encryptedBytes = CryptoJS.enc.Hex.parse(encrypted);
    const decrypted = CryptoJS.AES.decrypt(
      { ciphertext: encryptedBytes },
      CryptoJS.enc.Utf8.parse(encryptScreteKey),
      {
        iv: ivBytes,
        mode: CryptoJS.mode.CBC,
        padding: CryptoJS.pad.Pkcs7,
      }
    );
    return decrypted.toString(CryptoJS.enc.Utf8);
  };

  export {encrypt,decrypt};