public IReadOnlyShelf PickUp(Supermarket supermarket, IReadOnlyShoppingList shoppingList)
{
if (supermarket.Shelves.Count == 0)
{
throw new InvalidOperationException();
}
var result = FindOptimal(supermarket, shoppingList);
if (shoppingList.Positions.Any(p => p.ProductSpecification.Name == result.ProductSpecification.Name))
{
return(result);
}
var excluded = new List <IReadOnlyShelf>()
{
result
};
while (excluded.Count < shoppingList.Positions.Count)
{
result = FindOptimal(supermarket, shoppingList, excluded);
if (shoppingList.Positions.Any(p => p.ProductSpecification.Name == result.ProductSpecification.Name))
{
return(result);
}
excluded.Add(result);
}
return(null);
}
private IReadOnlyShelf FindOptimal(Supermarket supermarket, IReadOnlyShoppingList shoppingList, IReadOnlyCollection <IReadOnlyShelf> excluded = null)
{
var baseQuery = supermarket.Shelves
.Where(s => shoppingList.NonCompletedPositions.Any(p => p.ProductSpecification.Name == s.Object.ProductSpecification.Name));
if (excluded == null)
{
return(baseQuery.OrderBy(s => s.QueueLength).First().Object);
}
return(baseQuery.Where(s => !excluded.Any(e => e.ProductSpecification.Name == s.Object.ProductSpecification.Name))
.OrderBy(s => s.QueueLength)
.First().Object);
}
