package index.alg;

import index.entity.Point;
import index.entity.WholeIndex;
import index.file.OperateFile;

import java.io.FileNotFoundException;
import java.util.ArrayList;

public class BuildInitialWholeIndex {
    //
    public WholeIndex build(ArrayList<Point> pointsList,Integer numOfGapsX,Integer numOfGapsY){

        pointsList.add(pointsList.get(0));

        Point point0 = pointsList.get(0);

        double minX = point0.getColX();

        double minY = point0.getColY();

        double maxX = point0.getColX();

        double maxY = point0.getColY();

        for (int i = 0 ; i < pointsList.size();i++){

            Point point = pointsList.get(i);

            double corX = point.getColX();
            double corY = point.getColY();

            if (corX < minX){

                minX = corX;

            }

            if (corX > maxX){

                maxX = corX;

            }

            if (corY < minY){

                minY = corY;

            }

            if (corY > maxY){

                maxY = corY;

            }

        }

        double xGap = (maxX - minX) / numOfGapsX;
        double yGap = (maxY - minY) / numOfGapsY;

        WholeIndex wholeIndex = new WholeIndex();
        wholeIndex.setMinX(minX);
        wholeIndex.setMinY(minY);
        wholeIndex.setNumOfGapsX(numOfGapsX);
        wholeIndex.setNumOfGapsY(numOfGapsY);
        wholeIndex.setxGap(xGap);
        wholeIndex.setyGap(yGap);

        return wholeIndex;

    }

}