/// <summary>
/// Creates providers for the demands through stock, productionOrders or purchases
/// </summary>
/// <param name="demand"></param>
/// <param name="task"></param>
/// <param name="simulationId"></param>
/// <returns>ProductionOrder to fulfill the demand, ProductionOrder is null if there was enough in stock</returns>
public List <ProductionOrder> NetRequirement(IDemandToProvider demand, MrpTask task, int simulationId)
{
//Todo: search for available POs
var stock = _context.Stocks.Include(a => a.DemandStocks)
.Single(a => a.ArticleForeignKey == demand.ArticleId);
var plannedStock = _context.GetPlannedStock(stock, demand);
var productionOrders = new List <ProductionOrder>();
var stockProvider = _context.TryCreateStockReservation(demand);
var time = _context.SimulationConfigurations.Single(a => a.Id == simulationId).Time;
//if the article has no children it has to be purchased
var children = _context.ArticleBoms.Where(a => a.ArticleParentId == demand.ArticleId).ToList();
if (children.Any())
{
//if the plannedStock is below zero, articles have to be produced for its negative amount
if (plannedStock < 0)
{
var fittingProductionOrders = _context.CheckForProductionOrders(demand, -plannedStock, _context.SimulationConfigurations.Single(a => a.Id == simulationId).Time);
var amount = -plannedStock;
if (fittingProductionOrders != null)
{
foreach (var fittingProductionOrder in fittingProductionOrders)
{
var availableAmount = _context.GetAvailableAmountFromProductionOrder(fittingProductionOrder);
var provider = _context.CreateDemandProviderProductionOrder(demand, fittingProductionOrder,
availableAmount < -plannedStock ? availableAmount : -plannedStock);
//productionOrders.Add(fittingProductionOrder);
_context.AssignProductionOrderToDemandProvider(fittingProductionOrder, provider);
amount -= availableAmount < -plannedStock ? availableAmount : -plannedStock;
if (amount == 0)
{
return(productionOrders);
}
}
}
if (amount > 0)
{
var pos = _context.CreateChildProductionOrders(demand, amount, simulationId);
productionOrders.AddRange(pos);
}
}
}
else if (plannedStock < stock.Min)
{
_context.CreatePurchaseDemand(demand, stock.Max - stock.Min, _context.SimulationConfigurations.Single(a => a.Id == simulationId).Time);
}
if (stock.Min <= 0 || plannedStock >= stock.Min || demand.GetType() == typeof(DemandStock))
{
return(productionOrders);
}
if (_context.Demands.OfType <DemandStock>()
.Any(a => a.ArticleId == demand.ArticleId &&
a.State != State.Finished))
{
return(productionOrders);
}
var demandStock = plannedStock < 0 ? _context.CreateStockDemand(demand, stock, stock.Min) : _context.CreateStockDemand(demand, stock, stock.Min - plannedStock);
//call processMrp to plan and schedule the stockDemand
_processMrp.RunRequirementsAndTermination(demandStock, task, simulationId);
return(productionOrders);
}