/**
 *
 */
package org.gcube.portlets.widgets.ckandatapublisherwidget.client.openlayerwidget;

import org.gcube.portlets.widgets.openlayerbasicwidgets.client.event.SelectAreaDialogEvent;
import org.gcube.portlets.widgets.openlayerbasicwidgets.client.event.SelectAreaDialogEvent.SelectAreaDialogEventHandler;
import org.gcube.portlets.widgets.openlayerbasicwidgets.client.event.SelectAreaDialogEventType;
import org.gcube.portlets.widgets.openlayerbasicwidgets.client.widgets.AreaSelectionDialog;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsonUtils;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.user.client.Command;



/**
 * The Class GeoJsonAreaSelectionDialog.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 * Feb 20, 2019
 */
public class GeoJsonAreaSelectionDialog extends AreaSelectionDialog{


	private String wktArea;
	private Command onResponseCommand;

	/**
	 * Instantiates a new geo json area selection dialog.
	 */
	public GeoJsonAreaSelectionDialog() {

		//THE HANDLER
		SelectAreaDialogEventHandler handler = new SelectAreaDialogEventHandler() {

			@Override
			public void onResponse(SelectAreaDialogEvent event) {
				print("SelectAreaDialog Response: "+event);

				if(event==null)
					return;

				SelectAreaDialogEventType closedType = event.getSelectAreaDialogEventType();

				if(closedType==null)
					return;

				wktArea = null;
				if(closedType.equals(SelectAreaDialogEventType.Completed)){
					wktArea = event.getArea();
					onResponseCommand.execute();
				}
			}
		};

		addSelectAreaDialogEventHandler(handler);
		this.getElement().addClassName("GeoJson-DialogBox");
		setZIndex(10000);
	}


	/**
	 * Fire command on response.
	 *
	 * @param command the command
	 */
	public void fireCommandOnResponse(Command command){
		this.onResponseCommand = command;
	}


	/**
	 * Convert wkt to geo json.
	 *
	 * @param wktData the wkt data
	 * @return the string
	 */
	private static native String convertWKTToGeoJSON(String wktData) /*-{
		try {
			var ol = $wnd.ol;
			var geojson_options = {};
			var wkt_format = new ol.format.WKT();
			var testFeature = wkt_format.readFeature(wktData);
			var wkt_options = {};
			var geojson_format = new ol.format.GeoJSON(wkt_options);
			var out = geojson_format.writeFeature(testFeature);
			//window.getELementById("my-id").innerhtml(out);
			//alert(out);
			console.log(out)
			return out;
		}catch(err) {
  			console.log(err.message);
  			return null;
		}
	}-*/;

	public static native String print(String data) /*-{
		console.log(out)
	}-*/;


	/**
	 * Wkt to geo json.
	 *
	 * @param wktTxt the wkt txt
	 * @return the string
	 */
	public String wktToGeoJSON(String wktTxt){
		String geoJSON = convertWKTToGeoJSON(wktTxt);
		//Window.alert("geoJSON: "+geoJSON);
		print("geoJSON: "+geoJSON);

		if(geoJSON==null)
			return null;

		JavaScriptObject toJSON = JsonUtils.safeEval(geoJSON);
		JSONObject objJson = new JSONObject(toJSON);
		return objJson.get("geometry").toString();
	}

	/**
	 * Gets the WKT to geo json.
	 *
	 * @return the WKT to geo json
	 */
	public String getWKTToGeoJSON(){

		if(wktArea==null){
			print("wktArea is null");
			return null;
		}

		return wktToGeoJSON(wktArea);
	}


	/**
	 * Gets the wkt area.
	 *
	 * @return the wktArea
	 */
	public String getWktArea() {

		return wktArea;
	}
}