try {
  await sdk.shield({ tokenAddress, amount });
} catch (error) {
  console.log(error.message); // e.g., "Insufficient balance"
}

try {
  const result = await sdk.shield({ tokenAddress, amount });
} catch (error) {
  if (error.message.includes('Not authenticated')) {
    // User needs to log in
  } else if (error.message.includes('Insufficient balance')) {
    // Not enough tokens
  } else if (error.message.includes('Network error')) {
    // Backend unreachable — retry
  } else if (error.message.includes('Invalid amount')) {
    // Bad input
  } else {
    console.log('Unexpected error:', error.message);
  }
}

async function withRetry<T>(
  operation: () => Promise<T>,
  maxRetries: number = 3
): Promise<T> {
  for (let attempt = 1; attempt <= maxRetries; attempt++) {
    try {
      return await operation();
    } catch (error) {
      if (error.message.includes('Network error') && attempt < maxRetries) {
        await new Promise((r) => setTimeout(r, 1000 * attempt));
        continue;
      }
      throw error;
    }
  }
  throw new Error('Unreachable');
}

// Usage
const balance = await withRetry(() => sdk.getBalance(tokenAddress));

function userMessage(error: Error): string {
  const msg = error.message;

  if (msg.includes('Not connected')) return 'Please connect your wallet';
  if (msg.includes('Not authenticated')) return 'Please log in first';
  if (msg.includes('Insufficient balance')) return 'Not enough balance';
  if (msg.includes('Invalid privacy address')) return 'Invalid recipient address';
  if (msg.includes('Invalid amount')) return 'Invalid amount';
  if (msg.includes('Chain mismatch')) return 'Please switch to the correct network';
  if (msg.includes('Network error')) return 'Network error. Please try again.';

  return 'Something went wrong. Please try again.';
}

try {
  await sdk.shield({ tokenAddress, amount });
} catch (error) {
  console.error('Deposit failed:', error.message);
  showAlert(userMessage(error));
}

try {
  await sdk.shield({ tokenAddress, amount });
} catch (error) {
  console.error('[PrivacyBoost]', error.message);
  showAlert(userMessage(error));
}