NearRequiredBuildingConstructionPositionFinder.java

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package jsettlers.ai.construction;

import java.util.ArrayList;
import java.util.List;

import jsettlers.ai.highlevel.AiStatistics;
import jsettlers.algorithms.construction.AbstractConstructionMarkableMap;
import jsettlers.common.buildings.EBuildingType;
import jsettlers.common.position.ShortPoint2D;

/**
 * Algorithm: find all possible construction points within the land of the player - calculates a score and take the position with the best score -
 * score is affected by the distance to needed buildings (eg. lumberjacks for sawmills) - score is affected by the effort to flattern
 * 
 * @author codingberlin
 */
public class NearRequiredBuildingConstructionPositionFinder implements IBestConstructionPositionFinder {

	EBuildingType buildingType;
	EBuildingType neededBuildingType;

	public NearRequiredBuildingConstructionPositionFinder(EBuildingType ownBuildingType, EBuildingType neededBuildingType) {
		this.buildingType = ownBuildingType;
		this.neededBuildingType = neededBuildingType;
	}

	@Override
	public ShortPoint2D findBestConstructionPosition(AiStatistics aiStatistics, AbstractConstructionMarkableMap constructionMap, byte playerId) {
		List<ShortPoint2D> neededBuildings = aiStatistics.getBuildingPositionsOfTypeForPlayer(neededBuildingType, playerId);
		List<ScoredConstructionPosition> scoredConstructionPositions = new ArrayList<ScoredConstructionPosition>();
		for (ShortPoint2D point : aiStatistics.getLandForPlayer(playerId)) {
			if (constructionMap.canConstructAt(point.x, point.y, buildingType, playerId) && !aiStatistics.blocksWorkingAreaOfOtherBuilding(point,
					playerId, buildingType)) {
				ShortPoint2D nearestNeededBuilding = AiStatistics.detectNearestPointFromList(point, neededBuildings);
				int nearestNeededBuildingDistance = 0;
				if (nearestNeededBuilding != null) {
					nearestNeededBuildingDistance = point.getOnGridDistTo(nearestNeededBuilding);
				}
				byte flatternEffort = aiStatistics.getFlatternEffortAtPositionForBuilding(point, buildingType);
				scoredConstructionPositions.add(new ScoredConstructionPosition(point, nearestNeededBuildingDistance + flatternEffort));
			}
		}

		return ScoredConstructionPosition.detectPositionWithLowestScore(scoredConstructionPositions);
	}
}