public bool TryGetMoveTargetValidateWithBoardMove(Board board, MapNode source, AllianceScenario allianceScenario, BoardMove boardMove, out List <MapNode> path, out UnitMove move)
{
if (!board.OccupiedMapNodes.ContainsKey(source))
{
throw new Exception($"No unit occupies {source} in the given board");
}
var movesAvailableForSource = boardMove.GetAvailableFallSpringMovesForMapNode(board, source);
if (movesAvailableForSource.Count == 0)
{
// couldn't find anything.
// this is caused by picking moves that lead to a contradiction.
// Force the caller to deal, perhaps with a hold on all affected...
path = null;
move = null;
return(false);
}
Unit unit = board.OccupiedMapNodes[source];
Coalition myCoalition = allianceScenario.GetPossibleCoalitions()[unit.Power];
List <KeyValuePair <MapNode, double> > orderedDistances = GetWeightedMapNodeDistances(board, source, allianceScenario)
.OrderBy(kvp2 => kvp2.Value).ToList();
// are we sitting on a supplycenter that we want? If so, hold
if (source.Territory.IsSupplyCenter && !board.SupplyCenterIsOwnedBy(source.Territory, myCoalition))
{
UnitMove holdMove = new UnitMove(unit, source);
if (boardMove == null || boardMove.CurrentlyAllowsFallSpring(holdMove))
{
path = new List <MapNode>()
{
source
};
move = holdMove;
return(true);
}
}
List <Func <MapNode, bool> > predicateList = new List <Func <MapNode, bool> >()
{
(mn) => { return(mn.Territory.IsSupplyCenter && !board.SupplyCenterIsOwnedBy(mn.Territory, myCoalition)); },
(mn) => { return(mn.Territory != source.Territory); },
(mn) => { return(mn.Territory == source.Territory); },
};
foreach (var predicate in predicateList)
{
path = GetPath(board, source, boardMove, orderedDistances, predicate);
if (path != null)
{
MapNode moveTarget = path[1];
move = board.GetUnitMoves().FirstOrDefault(um => um.Edge.Source == source && um.Edge.Target == moveTarget);
return(true);
}
}
UnitMove lastResort = movesAvailableForSource.First();
path = new List <MapNode>()
{
lastResort.Edge.Target
};
move = lastResort;
return(true);
}