Function UpdateBalances

model/model.go:421–450

UpdateBalances updates the balances for both the source and destination based on the transaction details. It ensures precision is applied and checks for overdraft before updating.

(transaction *Transaction, source, destination *Balance)

// UpdateBalances updates the balances for both the source and destination based on the transaction details.
// It ensures precision is applied and checks for overdraft before updating.
func UpdateBalances(transaction *Transaction, source, destination *Balance) error {
	// Apply precision to get precise amount
	transaction.PreciseAmount = ApplyPrecision(transaction)
	err := transaction.validate()
	if err != nil {
		return err
	}

	// Check if source has sufficient funds
	err = canProcessTransaction(transaction, source)
	if err != nil {
		return err
	}

	source.InitializeBalanceFields()
	destination.InitializeBalanceFields()

	// Update source balance with original precise amount
	source.addDebit(transaction.PreciseAmount, transaction.Inflight)
	source.computeBalance(transaction.Inflight)

	// Calculate destination amount with rate
	destinationAmount := ApplyRate(transaction.PreciseAmount, transaction.Rate)

	// Update destination balance with rate-adjusted amount
	destination.addCredit(destinationAmount, transaction.Inflight)
	destination.computeBalance(transaction.Inflight)

	return nil
}

// CheckCondition checks if a balance meets the condition specified by a BalanceMonitor.
// It compares various balance fields (e.g., debit balance, credit balance) against the precise value.