package be.gim.belmap.entityapi.model.deserializers;


import org.bson.Document;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.convert.ReadingConverter;
import org.springframework.data.geo.Point;
import org.springframework.data.mongodb.core.geo.GeoJsonLineString;
import org.springframework.data.mongodb.core.geo.GeoJsonMultiPolygon;
import org.springframework.data.mongodb.core.geo.GeoJsonPoint;
import org.springframework.data.mongodb.core.geo.GeoJsonPolygon;
import org.springframework.util.Assert;
import org.springframework.util.NumberUtils;

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

@ReadingConverter
public class GeoJsonMultiPolygonDeserializer implements Converter<Document, GeoJsonMultiPolygon> {

    @Override
    public GeoJsonMultiPolygon convert(Document source) {
        List<GeoJsonPolygon> geoJsonPolygons = new ArrayList<>();
        var jsonPolygons = (List) source.get("coordinates");
        for (var jsonPolygon : jsonPolygons){
            Iterator<GeoJsonLineString> it = ((List) jsonPolygon).iterator();
            GeoJsonPolygon g = new GeoJsonPolygon(toListOfPoint((List) it.next()));
            while (it.hasNext())
                g = g.withInnerRing(toListOfPoint((List) it.next()));
            geoJsonPolygons.add(g);
        }
        return new GeoJsonMultiPolygon(geoJsonPolygons);
    }

    private List<Point> toListOfPoint(List listOfCoordinatePairs) {
        List<Point> points = new ArrayList();
        Iterator var2 = listOfCoordinatePairs.iterator();

        while(var2.hasNext()) {
            Object point = var2.next();
            Assert.isInstanceOf(List.class, point);
            List<Number> coordinatesList = (List)point;
            points.add(new GeoJsonPoint(toPrimitiveDoubleValue(coordinatesList.get(0)), toPrimitiveDoubleValue(coordinatesList.get(1))));
        }

        return points;
    }
    private double toPrimitiveDoubleValue(Object value) {
        Assert.isInstanceOf(Number.class, value, "Argument must be a Number.");
        return (Double) NumberUtils.convertNumberToTargetClass((Number)value, Double.class);
    }
}