/*
* AIMovementToDestinationRule.cpp, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#include "StdInc.h"
#include "AIMovementToDestinationRule.h"

namespace NK2AI
{
namespace AIPathfinding
{
	AIMovementToDestinationRule::AIMovementToDestinationRule(const std::shared_ptr<AINodeStorage> & nodeStorage, const bool allowBypassObjects, CCallback & cc)
		: nodeStorage(nodeStorage), allowBypassObjects(allowBypassObjects), cc(cc)
	{
	}

	void AIMovementToDestinationRule::process(
		const PathNodeInfo & source,
		CDestinationNodeInfo & destination,
		const PathfinderConfig * pathfinderConfig,
		CPathfinderHelper * pathfinderHelper
	) const
	{
		auto blocker = getBlockingReason(source, destination, pathfinderConfig, pathfinderHelper);

		if(blocker == BlockingReason::NONE)
			return;

		if(blocker == BlockingReason::DESTINATION_BLOCKED && destination.action == EPathNodeAction::EMBARK
		   && nodeStorage->getAINode(destination.node)->specialAction)
		{
			return;
		}

		if(blocker == BlockingReason::SOURCE_GUARDED)
		{
			auto actor = nodeStorage->getAINode(source.node)->actor;

			if(!allowBypassObjects)
			{
				if(source.node->getCost() < 0.0001f)
					return;

				// when actor represents moster graph node, we need to let him escape monster
				if(cc.getGuardingCreaturePosition(source.coord) == actor->initialPosition)
					return;
			}

			if(actor->allowBattle)
			{
#if NK2AI_PATHFINDER_TRACE_LEVEL >= 1
				logAi->trace("Bypass src guard while moving from %s to %s", source.coord.toString(), destination.coord.toString());
#endif
				return;
			}
		}

		destination.blocked = true;
	}
}

}