BestWaterWorksConstructionPositionFinder.java

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package jsettlers.ai.construction;

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

import jsettlers.ai.highlevel.AiPositions;
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 borders of the player - calculates a score based on the distance from the most near
 * river of the possible construction position - takes the position with the best score (lowest distance to the most near river)
 * 
 * @author codingberlin
 */
public class BestWaterWorksConstructionPositionFinder implements IBestConstructionPositionFinder {

	EBuildingType buildingType;

	public BestWaterWorksConstructionPositionFinder(EBuildingType buildingType) {
		this.buildingType = buildingType;
	}

	@Override
	public ShortPoint2D findBestConstructionPosition(AiStatistics aiStatistics, AbstractConstructionMarkableMap constructionMap, byte playerId) {
		AiPositions rivers = aiStatistics.getRiversForPlayer(playerId);
		if (rivers.size() == 0) {
			return null;
		}
		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 nearestRiverPosition = rivers.getNearestPoint(point, buildingType.getWorkRadius(), null);
				if (nearestRiverPosition != null) {
					int riverDistance = point.getOnGridDistTo(nearestRiverPosition);
					scoredConstructionPositions.add(new ScoredConstructionPosition(point, riverDistance));
				}
			}
		}

		return ScoredConstructionPosition.detectPositionWithLowestScore(scoredConstructionPositions);
	}

}