private (int correctionIndex, double prevEndingBalance) CorrectEarliestTouchedStartingAndEndingBalance(DateTime earliestDayTouched)
{
// At first glance, you might wonder: Why do we need to correct the StartingBalance for our first updated/inserted date?
// After all, a previously existing Date would have had a correct StartingBalance, and we only would have touched
// the total transaction amount that occurred on that day.
//
// The concern is over the scenarios where:
// a) We inserted a new entry
// b) That entry may be at the start of our overall list of Dates, or it may
// be downstream amongst existing dates.
//
// In these scenarios, we need to set our StartingBalance for the day.
//
double prevEndingBalance;
var correctionIndex = this._dailyBalances.IndexOfKey(earliestDayTouched);
IDailyBalance dailyBalanceToBeCorrected = this._dailyBalances.ElementAt(correctionIndex).Value;
if (correctionIndex == 0)
{
// First Date in our system. We must use the StartingBalance for the BankAccount
prevEndingBalance = this.StartingBalance;
}
else
{
// There are dates before us. Grab the previous date's EndingBalance so that we can correct our
// StartingBalance appropriately
prevEndingBalance = this._dailyBalances.ElementAt(correctionIndex - 1).Value.EndingBalance;
}
dailyBalanceToBeCorrected.AdjustStartingBalance(prevEndingBalance);
return(correctionIndex, dailyBalanceToBeCorrected.EndingBalance);
}
private void CorrectRemainingDaysStartingAndEndingBalances(int correctionIndex, double prevEndingBalance)
{
// Correct all days thereafter
for (correctionIndex += 1;
correctionIndex < this._dailyBalances.Count;
correctionIndex += 1)
{
IDailyBalance dailyBalanceToBeCorrected = this._dailyBalances.ElementAt(correctionIndex).Value;
dailyBalanceToBeCorrected.AdjustStartingBalance(prevEndingBalance);
prevEndingBalance = dailyBalanceToBeCorrected.EndingBalance;
}
}