/// <summary>
/// Deep copies this instance of a BlockDescription
/// </summary>
/// <returns>
/// The copy.
/// </returns>
public BlockDescription DeepCopy()
{
BlockDescription copy = new BlockDescription();
copy._blockMap = new SortedList <CreatureCard, AttackerToBlockersTuple>(_blockMap.Count, comp);
foreach (var cc in _blockMap.Keys)
{
copy._blockMap.Add(cc, new AttackerToBlockersTuple(cc, _blockMap[cc].Blockers));
}
return(copy);
}
public static IEnumerable <BlockDescription> GetPossibleBlocks(IList <CreatureCard> attackers, IList <CreatureCard> possibleBlockers)
{
var allBlocksList = new List <BlockDescription>();
var blockersToUse = possibleBlockers.PowerSet();
allBlocksList.Add(new BlockDescription(attackers));
//GetPossibleBlocksAux(attackers,possibleBlockers,possibleBlockers.Count - 1, emptyBlocks, allBlocksList);
foreach (var blkSet in blockersToUse)
{
if (blkSet.Count == 0)
{
continue;
}
BlockDescription emptyBlocks = new BlockDescription(attackers);
GetPossibleBlocksAux(attackers, blkSet, blkSet.Count - 1, emptyBlocks, allBlocksList);
}
return(allBlocksList);
}
/// <summary>
/// Recursive helper function to get the possible blocks and add them to blockDescriptions.
/// </summary>
/// <param name='atkSet'>
/// List of attackers to consider.
/// </param>
/// <param name='blkSet'>
/// List of blockers to consider.
/// </param>
/// <param name='blkSetEndIndex'>
/// The index of the last item in blkSet not yet assigned.
/// </param>
/// <param name='parent'>
/// The parent <see cref="BlockDescription"/> for the current recursive call to consider.
/// </param>
/// <param name='blockDescriptions'>
/// A list that will be filled with the <see cref="BlockDescription"/>s built
/// </param>
private static void GetPossibleBlocksAux(IList <CreatureCard> atkSet, IList <CreatureCard> blkSet, int blkSetEndIndex, BlockDescription parent, IList <BlockDescription> blockDescriptions)
{
// base case - no more blockers to assign, so add this block description to the list
if (blkSetEndIndex < 0)
{
blockDescriptions.Add(parent);
return;
}
// contraction - remove last blocker and assign it to all possible attackers
CreatureCard lastBlocker = blkSet[blkSetEndIndex--];
foreach (var attacker in atkSet)
{
var newBlockingChoice = parent.DeepCopy();
newBlockingChoice[attacker].Blockers.Add(lastBlocker);
GetPossibleBlocksAux(atkSet, blkSet, blkSetEndIndex, newBlockingChoice, blockDescriptions);
}
}
