private Task <PrevYearManureApplViewModel> GetPrevYearManureAsync(string fldName)
{
PrevYearManureApplViewModel manureVM = new PrevYearManureApplViewModel();
// get the current associated value for nitrogen credit. Note, can be null
SERVERAPI.Utility.ChemicalBalanceMessage calculator = new Utility.ChemicalBalanceMessage(_ud, _sd);
Field fld = _ud.GetFieldDetails(fldName);
manureVM.display = false;
if (fld.crops != null)
{
if (fld.crops.Count() > 0)
{
manureVM.display = _sd.wasManureAddedInPreviousYear(fld.prevYearManureApplicationFrequency);
if (manureVM.display)
{
manureVM.fldName = fldName;
if (fld.prevYearManureApplicationNitrogenCredit != null)
{
manureVM.nitrogen = fld.prevYearManureApplicationNitrogenCredit;
}
else
{
// lookup default Nitrogen credit
manureVM.nitrogen = calculator.calcPrevYearManureApplDefault(fldName);
}
}
else
{
fld.prevYearManureApplicationNitrogenCredit = null;
_ud.UpdateField(fld);
}
}
else
{
fld.prevYearManureApplicationNitrogenCredit = null;
_ud.UpdateField(fld);
}
}
else
{
//reset the nitrogen credit to null
fld.prevYearManureApplicationNitrogenCredit = null;
_ud.UpdateField(fld);
}
return(Task.FromResult(manureVM));
}
