package tim.prune.function;

import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import tim.prune.App;
import tim.prune.I18nManager;
import tim.prune.data.DataPoint;
import tim.prune.data.Field;
import tim.prune.data.Latitude;
import tim.prune.data.Longitude;
import tim.prune.function.search.GenericDownloaderFunction;
import tim.prune.function.search.SearchResult;

/**
 * Function to load information about geocaches nearby to the current point
 * using the service at opencaching.de
 */
public class SearchOpenCachingDeFunction extends GenericDownloaderFunction
{
	/** Maximum distance from point in km */
	private static final int MAX_DISTANCE = 50;


	/**
	 * Constructor
	 * @param inApp App object
	 */
	public SearchOpenCachingDeFunction(App inApp) {
		super(inApp);
	}

	/**
	 * @return name key
	 */
	public String getNameKey() {
		return "function.searchopencachingde";
	}

	/**
	 * @param inColNum index of column, 0 or 1
	 * @return key for this column
	 */
	protected String getColumnKey(int inColNum)
	{
		if (inColNum == 0) return "dialog.wikipedia.column.name";
		return "dialog.wikipedia.column.distance";
	}


	/**
	 * Run method to call service in a separate thread
	 */
	public void run()
	{
		_statusLabel.setText(I18nManager.getText("confirm.running"));
		// Get coordinates from current point
		DataPoint point = _app.getTrackInfo().getCurrentPoint();
		if (point == null)
		{
			return;
		}

		final double lat = point.getLatitude().getDouble();
		final double lon = point.getLongitude().getDouble();
		submitSearch(lat, lon);

		// Set status label according to error or "none found", leave blank if ok
		if (_errorMessage == null && _trackListModel.isEmpty()) {
			_errorMessage = I18nManager.getText("dialog.geocaching.nonefound");
		}
		_statusLabel.setText(_errorMessage == null ? "" : _errorMessage);
	}

	/**
	 * Submit the search for the given parameters
	 * @param inLat latitude
	 * @param inLon longitude
	 */
	private void submitSearch(double inLat, double inLon)
	{
		// The only parameters are lat and long from the current point
		String urlString = "https://opencaching.de/search.php?searchto=searchbydistance&showresult=1"
			+ "&output=XML&sort=bydistance&lat=" + inLat
			+ "&lon=" + inLon + "&distance=" + MAX_DISTANCE + "&unit=km";
		// Parse the returned XML with a special handler
		OpenCachingDeXmlHandler xmlHandler = new OpenCachingDeXmlHandler();
		InputStream inStream = null;

		try
		{
			URL url = new URL(urlString);
			SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
			inStream = url.openStream();
			saxParser.parse(inStream, xmlHandler);
		}
		catch (Exception e) {
			_errorMessage = e.getClass().getName() + " - " + e.getMessage();
		}
		// Close stream and ignore errors
		try {
			inStream.close();
		} catch (Exception e) {}
		// Add track list to model
		ArrayList<SearchResult> trackList = xmlHandler.getTrackList();
		_trackListModel.addTracks(trackList);

		// Show error message if any
		if (_trackListModel.isEmpty())
		{
			String error = xmlHandler.getErrorMessage();
			if (error != null && !error.equals(""))
			{
				_app.showErrorMessageNoLookup(getNameKey(), error);
				_errorMessage = error;
			}
		}
	}

	/**
	 * Load the selected point(s)
	 */
	protected void loadSelected()
	{
		// Find the rows selected in the table and get the corresponding coords
		int numSelected = _trackTable.getSelectedRowCount();
		if (numSelected < 1) return;
		int[] rowNums = _trackTable.getSelectedRows();
		for (int i=0; i<numSelected; i++)
		{
			int rowNum = rowNums[i];
			if (rowNum >= 0 && rowNum < _trackListModel.getRowCount())
			{
				String lat = _trackListModel.getTrack(rowNum).getLatitude();
				String lon = _trackListModel.getTrack(rowNum).getLongitude();
				if (lat != null && lon != null)
				{
					DataPoint point = new DataPoint(new Latitude(lat), new Longitude(lon), null);
					point.setFieldValue(Field.WAYPT_NAME, _trackListModel.getTrack(rowNum).getTrackName(), false);
					_app.createPoint(point);
				}
			}
		}
		// Close the dialog
		_cancelled = true;
		_dialog.dispose();
	}
}