Balance API

// Example: Regular balance polling
setInterval(async () => {
  try {
    const response = await getMerchantBalances();
    updateBalanceDisplay(response.data);
    
    // Check for significant changes
    const previousTotal = getPreviousTotal();
    const currentTotal = calculateTotalBalance(response.data);
    const change = ((currentTotal - previousTotal) / previousTotal) * 100;
    
    if (Math.abs(change) > 5) { // 5% threshold
      notifyBalanceChange(change);
    }
  } catch (error) {
    console.error('Failed to fetch balances:', error);
  }
}, 30000); // Every 30 seconds

function calculateTotalBalance(balances) {
  // Convert all balances to USD equivalent
  return (
    balances.btcBalance * btcPrice +
    balances.ethBalance * ethPrice +
    balances.usdtBalance * 1 +
    balances.bscusdBalance * 1 +
    // ... other currencies
  );
}

// Example: Optimized balance fetching
class BalanceManager {
  constructor() {
    this.cache = new Map();
    this.lastUpdate = 0;
    this.updateInterval = 30000; // 30 seconds
  }

  async getBalances(forceUpdate = false) {
    const now = Date.now();
    
    // Return cached data if recent enough
    if (!forceUpdate && (now - this.lastUpdate) < this.updateInterval) {
      return this.cache.get('balances');
    }

    try {
      const response = await fetchBalances();
      this.cache.set('balances', response.data);
      this.lastUpdate = now;
      return response.data;
    } catch (error) {
      // Return cached data on error if available
      const cached = this.cache.get('balances');
      if (cached) {
        console.warn('Using cached balance data due to API error');
        return cached;
      }
      throw error;
    }
  }
}

// Example: Robust error handling
async function getBalancesWithRetry(maxRetries = 3) {
  for (let attempt = 1; attempt <= maxRetries; attempt++) {
    try {
      return await getMerchantBalances();
    } catch (error) {
      if (attempt === maxRetries) {
        throw error;
      }
      
      // Exponential backoff
      const delay = Math.pow(2, attempt) * 1000;
      await new Promise(resolve => setTimeout(resolve, delay));
    }
  }
}