/*
* public static bool RemoveFromA_AddToB(
* IItemContainer containerA, int idxA,
* IItemContainer containerB)
* {
* // verify idxA
* if (IsNotInRange(idxA, containerA.Size)) return false;
* var id = containerA.Provider.GetId(idxA);
*
* // calc changes
* var remFromA = ItemChangeInfo.Remove(idxA);
* var addToB = containerB.CalcChangeInfo(id,
* containerA.Provider.GetAmount(idxA));
*
* // verify add to b
* if (!addToB.IsValid && addToB.OverflowAmount != 0) return false;
*
* // execute
* if (!SafeDoubleInfoExecute(
* containerA, remFromA,
* containerB, addToB)) return false;
*
* return true;
* }
*/
// TODO : write tests for InterManagerSwap
/// <summary>
/// Swaps items between two containers without preserving the item indicies.
/// </summary>
/// <returns>True on success, false otherwise</returns>
public static bool InterManagerSwap(
IItemContainer containerA, int idxA,
IItemContainer containerB, int idxB)
{
// if idxB is null, find either an item idx with the same id or an empty slot.
// validate indicies
if (IsNotInRange(idxA, containerA.Provider.Count))
{
return(false);
}
if (IsNotInRange(idxB, containerB.Provider.Count))
{
return(false);
}
// get items
var itemA = containerA.Provider[idxA];
var itemB = containerB.Provider[idxB];
// calc change info
// add A to containerB
var cAtoB = containerB.CalcChangeInfo(itemA);
// add B to containerA
var cBtoA = containerA.CalcChangeInfo(itemB);
// operation is undefinied if any changeInfo's are invalid or have overflow, return false
bool IsInvalidChangeInfo(ref ItemChangeInfo info)
=> !info.IsValid || info.OverflowAmount != 0;
if (IsInvalidChangeInfo(ref cAtoB))
{
return(false);
}
if (IsInvalidChangeInfo(ref cBtoA))
{
return(false);
}
// managed remove A and B
if (!SafeDoubleInfoExecute(
containerA, ItemChangeInfo.Remove(idxA),
containerB, ItemChangeInfo.Remove(idxB)))
{
return(false);
}
// execute change infos we calculated earlier
if (!SafeDoubleInfoExecute(
containerA, cBtoA,
containerB, cAtoB))
{
return(false);
}
return(true);
}