const fs = require('fs');
const path = require('path');
const CryptoJS = require('crypto-js');

const encryptionKey = process.env.ENCRYPTION_KEY;
const dbPath = path.join(__dirname, 'db.json');

const readDb = () => {
  try {
    const data = fs.readFileSync(dbPath, 'utf8');
    if (data) {
      const bytes = CryptoJS.AES.decrypt(data, encryptionKey);
      const decryptedData = bytes.toString(CryptoJS.enc.Utf8);
      if (decryptedData) {
        return JSON.parse(decryptedData);
      }
    }
    return {};
  } catch (error) {
    if (error.code === 'ENOENT') {
      return {};
    }
    console.error('Error reading or decrypting db.json:', error);
    return {};
  }
};

const writeDb = (db) => {
  try {
    const data = JSON.stringify(db, null, 2);
    const encryptedData = CryptoJS.AES.encrypt(data, encryptionKey).toString();
    fs.writeFileSync(dbPath, encryptedData, 'utf8');
  } catch (error) {
    console.error('Error encrypting or writing to db.json:', error);
  }
};

module.exports = { readDb, writeDb, dbPath };