/// <summary>
/// Set Start- and Endtime for ProductionOrderWorkSchedules for the given OrderPart excluding capacities in a backward schedule
/// </summary>
/// <param name="demand"></param>
public void BackwardScheduling(IDemandToProvider demand)
{
var productionOrderWorkSchedules = new List <ProductionOrderWorkSchedule>();
_context.GetWorkSchedulesFromDemand(demand, ref productionOrderWorkSchedules);
productionOrderWorkSchedules = productionOrderWorkSchedules.OrderBy(a => a.ProductionOrderId).ThenByDescending(b => b.HierarchyNumber).ToList();
foreach (var workSchedule in productionOrderWorkSchedules)
{
// set transition time relating to machine group.
var transitionTime = Calculations.GetTransitionTimeForWorkSchedule(workSchedule);
//Set hierarchy to something high that every workSchedule found will overwrite this value
var hierarchyParent = _context.GetHierarchyParent(workSchedule);
//if no hierarchy has been found
if (hierarchyParent == null)
{
if (demand.State == State.ForwardScheduleExists)
{
workSchedule.EndForward = SetBackwardTimeFromParent(workSchedule, demand.State);
}
else
{
workSchedule.EndBackward = SetBackwardTimeFromParent(workSchedule, demand.State);
}
}
else
{
if (demand.State == State.ForwardScheduleExists)
{
workSchedule.EndForward = _context.ProductionOrderWorkSchedules.Single(a =>
(a.HierarchyNumber == hierarchyParent.HierarchyNumber) &&
(a.ProductionOrderId == workSchedule.ProductionOrderId)).StartForward;
}
else
{
workSchedule.EndBackward = _context.ProductionOrderWorkSchedules.Single(a =>
(a.HierarchyNumber == hierarchyParent.HierarchyNumber) &&
(a.ProductionOrderId == workSchedule.ProductionOrderId)).StartBackward;
}
}
if (demand.State == State.ForwardScheduleExists)
{
workSchedule.StartForward = workSchedule.EndForward - workSchedule.Duration - transitionTime;
workSchedule.EndForward = workSchedule.StartForward + workSchedule.Duration;
}
else
{
workSchedule.StartBackward = workSchedule.EndBackward - workSchedule.Duration - transitionTime;
workSchedule.EndBackward = workSchedule.StartBackward + workSchedule.Duration;
}
}
_context.ProductionOrderWorkSchedules.UpdateRange(productionOrderWorkSchedules);
_context.SaveChanges();
}