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package org.openlr.binary.reader;

import org.locationtech.jts.geom.Coordinate;

import java.io.ByteArrayInputStream;
import java.io.IOException;

class CoordinateReader {
    private final IntegerReader integerReader;

    CoordinateReader(IntegerReader integerReader) {
        this.integerReader = integerReader;
    }

    Coordinate readAbsoluteCoordinate(ByteArrayInputStream inputStream) throws IOException {
        double x = readAbsoluteOrdinate(inputStream);
        double y = readAbsoluteOrdinate(inputStream);
        return new Coordinate(x, y);
    }

    Coordinate readRelativeCoordinate(Coordinate reference, ByteArrayInputStream inputStream) throws IOException {
        double x = readRelativeOrdinate(reference.getX(), inputStream);
        double y = readRelativeOrdinate(reference.getY(), inputStream);
        return new Coordinate(x, y);
    }

    private double readAbsoluteOrdinate(ByteArrayInputStream inputStream) throws IOException {
        int value = integerReader.readSignedInteger(3, inputStream);
        return ((double) value - (Math.copySign(1.0, value) * 0.5)) * 360.0 / Math.pow(2, 24);
    }

    private double readRelativeOrdinate(double reference, ByteArrayInputStream inputStream) throws IOException {
        int value = integerReader.readSignedInteger(2, inputStream);
        double doubleValue = (double) value / 100000;
        return reference + doubleValue;
    }
}