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package de.westnordost.osmapi.traces;

import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.time.Instant;

import de.westnordost.osmapi.ApiResponseReader;
import de.westnordost.osmapi.common.Handler;
import de.westnordost.osmapi.common.XmlParser;
import de.westnordost.osmapi.map.data.LatLon;
import de.westnordost.osmapi.map.data.OsmLatLon;

/** Parses the trackpoints from response of the osm api (API 0.6). the osm api response is in the 
 *  form of a GPX, but we do not parse the whole GPX here but only the information that is necessary
 *  for the trackpoints. Hence the name "GpxTrackParser" and not "GPXParser". */
public class GpxTrackParser extends XmlParser implements ApiResponseReader
{
	private static final String
	  TRACKPOINT = "trkpt",
	  TRACKSEGMENT = "trkseg";

	private final Handler handler;
	
	private boolean isFirstPointInTrackSegment = false;

	private LatLon position;
	private Instant time;

	private Float horizontalDilutionOfPrecision;
	private Float elevation;

	public GpxTrackParser(Handler handler)
	{
		this.handler = handler;
	}
	
	@Override
	public Void parse(InputStream in) throws IOException
	{
		doParse(in);
		return null;
	}

	@Override
	protected void onStartElement() throws ParseException
	{
		String name = getName();
		
		if(name.equals(TRACKSEGMENT))
		{
			isFirstPointInTrackSegment = true;
		}
		else if(name.equals(TRACKPOINT))
		{
			position = OsmLatLon.parseLatLon(getAttribute("lat"), getAttribute("lon"));
		}
	}

	@Override
	protected void onEndElement() throws ParseException
	{
		String name = getName();
		
		if(TRACKPOINT.equals(name))
		{
			handler.handle(new GpsTrackpoint(
				position, time, isFirstPointInTrackSegment, horizontalDilutionOfPrecision, elevation
			));
			position = null;
			time = null;
			isFirstPointInTrackSegment = false;
			horizontalDilutionOfPrecision = null;
			elevation = null;
		}
		else if(TRACKPOINT.equals(getParentName()))
		{
			if(name.equals("time"))	time = Instant.parse(getText());
			if(name.equals("ele")) elevation = Float.valueOf(getText());
			if(name.equals("hdop"))	horizontalDilutionOfPrecision = Float.valueOf(getText());
		}
	}
}