MyMoneyMoney MyMoneyForecast::calculateAccountTrend(const MyMoneyAccount& acc, int trendDays)
{
MyMoneyFile* file = MyMoneyFile::instance();
MyMoneyTransactionFilter filter;
MyMoneyMoney netIncome;
QDate startDate;
QDate openingDate = acc.openingDate();
//validate arguments
if(trendDays < 1)
{
throw new MYMONEYEXCEPTION("Illegal arguments when calling calculateAccountTrend. trendDays must be higher than 0");
}
//If it is a new account, we don't take into account the first day
//because it is usually a weird one and it would mess up the trend
if(openingDate.daysTo(QDate::currentDate())<trendDays){
startDate = (acc.openingDate()).addDays(1);
}
else {
startDate = QDate::currentDate().addDays(-trendDays);
}
//get all transactions for the period
filter.setDateFilter(startDate, QDate::currentDate());
if(acc.accountGroup() == MyMoneyAccount::Income
|| acc.accountGroup() == MyMoneyAccount::Expense) {
filter.addCategory(acc.id());
} else {
filter.addAccount(acc.id());
}
filter.setReportAllSplits(false);
QValueList<MyMoneyTransaction> transactions = file->transactionList(filter);
QValueList<MyMoneyTransaction>::const_iterator it_t = transactions.begin();
//add all transactions for that account
for(; it_t != transactions.end(); ++it_t ) {
const QValueList<MyMoneySplit>& splits = (*it_t).splits();
QValueList<MyMoneySplit>::const_iterator it_s = splits.begin();
for(; it_s != splits.end(); ++it_s ) {
if(!(*it_s).shares().isZero()) {
if(acc.id()==(*it_s).accountId()) netIncome += (*it_s).value();
}
}
}
//calculate trend of the account in the past period
MyMoneyMoney accTrend;
//don't take into account the first day of the account
if(openingDate.daysTo(QDate::currentDate())<trendDays) {
accTrend = netIncome/MyMoneyMoney(openingDate.daysTo(QDate::currentDate())-1,1);
} else {
accTrend = netIncome/MyMoneyMoney(trendDays,1);
}
return accTrend;
}
