package org.simantics.district.network;

import org.geotools.referencing.GeodeticCalculator;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.simantics.databoard.Bindings;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.district.network.ontology.DistrictNetworkResource;

public class ModelledCRS implements CRS {

    private GeodeticCalculator calculator;

    public ModelledCRS(ReadGraph graph, Resource type) throws DatabaseException, FactoryException {
        String wkt = graph.getRelatedValue2(type, DistrictNetworkResource.getInstance(graph).HasSRTEXT, Bindings.STRING);
        CoordinateReferenceSystem crs = org.geotools.referencing.CRS.parseWKT(wkt);
        this.calculator = new GeodeticCalculator(crs);
    }
    
    @Override
    public double calculateDistance(double[] start, double[] end) {
        // TODO: fix the scale..
        calculator.setStartingGeographicPoint(start[0] / 100000, start[1] / 100000);
        calculator.setDestinationGeographicPoint(end[0] / 100000, end[1] / 100000);
        return calculator.getOrthodromicDistance();
    }

}