private ChartingViewModel GetNext()
{
DateTime newStartDate;
DateTime newFinishDate;
if (IntervalType == DayConstant)
{
newStartDate = StartDay.AddDays(1);
newFinishDate = FinishDay.AddDays(1);
}
else if (IntervalType == WeekConstant)
{
newStartDate = StartDay.AddDays(7).FirstDayOfWeek();
newFinishDate = FinishDay.AddDays(7).LastDayOfWeek();
}
else
{
var previousMonth = StartDay.AddMonths(1);
newStartDate = new DateTime(previousMonth.Year, previousMonth.Month, 1);
newFinishDate = StartDay.AddMonths(1).AddDays(-1);
}
// start date can be future date
if (newStartDate < DateTime.Now)
{
StartDay = newStartDate;
FinishDay = newFinishDate;
}
return(new ChartingViewModel(AppService.GetStatisticData(StartDay, FinishDay), StartDay, FinishDay));
}
private ChartingViewModel AddPrevious()
{
if (IntervalType == DayConstant)
{
StartDay = StartDay.AddDays(-1);
FinishDay = FinishDay.AddDays(-1);
}
else if (IntervalType == WeekConstant)
{
StartDay = StartDay.AddDays(-7).FirstDayOfWeek();
FinishDay = FinishDay.AddDays(-7).LastDayOfWeek();
}
else
{
var previousMonth = StartDay.AddMonths(-1);
StartDay = new DateTime(previousMonth.Year, previousMonth.Month, 1);
FinishDay = StartDay.AddMonths(1).AddDays(-1);
}
return(new ChartingViewModel(AppService.GetStatisticData(StartDay, FinishDay), StartDay, FinishDay));
}