/// <summary>
/// Ensures that proper conditions exist for box creation. Returns false if boxes need not be created
/// </summary>
/// <returns></returns>
private bool PreBoxCreation(PickslipGroup pickslipGroup, int pickslipId)
{
if (_bMinMaxPiecesRequired == null)
{
_bMinMaxPiecesRequired = RetrieveFromDataBase(_customerId);
}
//If Box minimum weight is greater than box maximum weight through the error
if (this.BoxMinWeight > this.BoxMaxWeight)
{
Trace.TraceWarning("Box Minimum Weight {0} is more than Box Maximum Weight {1}. Treating min weight as max weight",
this.BoxMinWeight, this.BoxMaxWeight);
this.BoxMaxWeight = this.BoxMinWeight;
this.BoxMinWeight = 0;
}
pickslipGroup.RetrieveFromDb(this, pickslipId, _bMinMaxPiecesRequired.Value);
// 1. Should have some SKUs to put in boxes.
// This can happen if boxes have already been created.
if (pickslipGroup.AllSku.All(p => p.OrderedPieces <= 0))
{
return(false);
}
return(true);
}
/// <summary>
/// Apply as many checks as we can think of to ensure that the created boxes meet all
/// requirements. This amounts to debugging the algorithm. If the test passes, insert boxes in
/// database.
/// </summary>
private void PostBoxCreation(PickslipGroup pickslipGroup)
{
// Ensure sanity
// 1. If we do not have any boxes, it means that some SKU was too big for the box
if (!pickslipGroup.Boxes.Any())
{
throw new InvalidConstraintException("Some SKU too big for all SKU cases");
}
// 5. Ensure that ordered SKUs and pieces exactly match SKU and pieces we have put in boxes
bool b = (from sku in pickslipGroup.Boxes.SelectMany(p => p.AllSku)
group sku by sku.UpcCode into grouping
orderby grouping.Key
select new
{
UpcCode = grouping.Key,
TotalPieces = grouping.Sum(p => p.OrderedPieces)
}).SequenceEqual(
from sku in pickslipGroup.AllSku
where sku.OrderedPieces > 0
group sku by sku.UpcCode into grouping
orderby grouping.Key
select new
{
UpcCode = grouping.Key,
TotalPieces = grouping.Sum(p => p.OrderedPieces)
});
if (!b)
{
throw new InvalidConstraintException("Some problem");
}
// 3. Find most used and most unused boxes. Exception if there are no boxes
var bestFillRatio = pickslipGroup.Boxes.Max(p => p.FillRatio);
if (bestFillRatio > 1)
{
throw new InvalidConstraintException("Overfilling a box?");
}
var worstFillRatio = pickslipGroup.Boxes.Min(p => p.FillRatio);
if (worstFillRatio < 0.01m)
{
throw new InvalidConstraintException("Very underused box?");
}
pickslipGroup.InsertBoxesInDb(this._ds);
}
/// <summary>
/// Creates boxes of pickslip using the passed case. The newly created boxes are accepted
/// only if the number of boxes created is less than the existing number of boxes.
/// Returns whether the boxes were accepted.
/// </summary>
/// <param name="boxCase"></param>
/// <returns></returns>
private bool CreateBoxesUsingBoxCase(PickslipGroup pickslipGroup, BoxCase boxCase)
{
// Remember the current solution
List <Box> curBoxes = pickslipGroup.RelinquishBoxList();
// Create a new solution
pickslipGroup.CreateBoxes(this, boxCase);
if (curBoxes != null && pickslipGroup.Boxes.Count > curBoxes.Count)
{
// This solution is worse. Accept the previous solution as the final solution
pickslipGroup.SetBoxList(curBoxes);
return(false);
}
else
{
// The solution was accepted
return(true);
}
}
///<summary>
/// Pass a pickslip to create its boxes.
/// </summary>
/// <remarks>
/// Algorithm:
/// 1. Retrieve all candidate box cases.
/// 2. Attempt to create boxes using the largest case first.
/// 3. Stop as soon as the number of boxes created are more than the previous solution and
/// accept the previous solution as the best solution.
///
/// TODO:
/// Handling for SLN (box creation on the basis of defined inner and outer pack /// <summary>
/// </remarks>
public void CreateBoxesForPickslipGroup(int pickslipId)
{
PickslipGroup pickslipGroup = new PickslipGroup();
bool b = PreBoxCreation(pickslipGroup, pickslipId);
if (!b)
{
return;
}
// Try each case first, starting with the biggest. Stop when number of cases needed increases.
foreach (BoxCase boxCase in this.BoxCases.OrderByDescending(p => p.Volume))
{
if (!this.CreateBoxesUsingBoxCase(pickslipGroup, boxCase))
{
// If this case is not accepted, we do not try any more
break;
}
}
//TODO: For each box, see whether it is possible to use a smaller SKU case
// If we get here, we must have some boxes
this.PostBoxCreation(pickslipGroup);
}