package org.gcube.portlets.user.geoportaldataviewer.client.ui.map;

import org.gcube.application.geoportalcommon.shared.gis.BoundsMap;
import org.gcube.portlets.user.geoportaldataviewer.client.GeoportalDataViewerConstants;
import org.gcube.portlets.user.geoportaldataviewer.client.gis.ExtentWrapped;
import org.gcube.portlets.user.geoportaldataviewer.client.gis.LightOpenLayerOSM;
import org.gcube.portlets.user.geoportaldataviewer.client.gis.MapUtils;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Widget;

import ol.Coordinate;
import ol.OLFactory;

 /**
  * The Class MapView.
  *
  * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
  * 
  * Nov 11, 2020
  */
 public class MapView extends Composite{

	private static MapViewUiBinder uiBinder = GWT.create(MapViewUiBinder.class);

	/**
	 * The Interface MapViewUiBinder.
	 *
	 * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
	 * 
	 * Nov 11, 2020
	 */
	interface MapViewUiBinder extends UiBinder<Widget, MapView> {
	}
	
	@UiField
	HTMLPanel theMap;
	
	@UiField
	HorizontalPanel coordinatePanel;
	
	private LightOpenLayerOSM olsm;
	
	/**
	 * Instantiates a new map view.
	 *
	 * @param centerTo the center to
	 * @param zoom the zoom
	 */
	public MapView(Coordinate centerTo, int zoom, String internalMapWidth, String internalMapHeight) {
		initWidget(uiBinder.createAndBindUi(this));
		String theMapId = "map"+Random.nextInt();
		theMap.getElement().setId(theMapId);
		theMap.setWidth(internalMapWidth);
		theMap.setHeight(internalMapHeight);
		
		Scheduler.get().scheduleDeferred(new ScheduledCommand() {

			@Override
			public void execute() {
				olsm = new LightOpenLayerOSM(theMapId);
		        //EPSG_4326_TO_ITALY
		        Coordinate centerCoordinate = OLFactory.createCoordinate(GeoportalDataViewerConstants.ITALY_CENTER_LONG, GeoportalDataViewerConstants.ITALY_CENTER_LAT);
		        Coordinate transformedCenterCoordinate = MapUtils.transformCoordiante(centerCoordinate, GeoportalDataViewerConstants.EPSG_4326, GeoportalDataViewerConstants.EPSG_3857);

		        olsm.setCenter(transformedCenterCoordinate);
		        olsm.setZoom(GeoportalDataViewerConstants.LIGHT_MAP_ITALY_FIT_ZOOM_ON);
		        //setMapSize();
		        
			}
		});
	}
	
	private void setMapSize() {
		Scheduler.get().scheduleDeferred(new ScheduledCommand() {

			@Override
			public void execute() {
				int width = theMap.getParent().getOffsetWidth();
				int height = theMap.getParent().getOffsetHeight();
				if(width==0)
					width = 300;
				
				if(height==0)
					height = 300;
				
				GWT.log("Internal Map w: "+width + ", h: "+height);
				theMap.setSize(width+"px", height+"px");
			}
		});
	}
	
	/**
	 * Adds the marker.
	 *
	 * @param coordinate the coordinate
	 * @param showCoordinateText the show coordinate text
	 */
	public void addMarker(Coordinate coordinate,  boolean showCoordinateText) {
		
		Scheduler.get().scheduleDeferred(new ScheduledCommand() {

			@Override
			public void execute() {
				if(olsm!=null) {
					olsm.addPoint(coordinate, showCoordinateText, true);
					olsm.getMap().getView().setCenter(coordinate);
				}
			}
		});
	}
	
	/**
	 * Adds the WMS layer.
	 *
	 * @param mapServerHost the map server host
	 * @param layerName     the layer name
	 * @param bbox          the bbox
	 */
	public void addWMSLayer(String mapServerHost, String layerName, BoundsMap bbox) {
		Scheduler.get().scheduleDeferred(new ScheduledCommand() {

			@Override
			public void execute() {
				
				ExtentWrapped ew = null;
				BoundsMap theBBOX = bbox;
				
				if (bbox != null) {
					

					Coordinate lower = OLFactory.createCoordinate(bbox.getLowerLeftX(), bbox.getLowerLeftY());
					Coordinate lowerCoord = MapUtils.transformCoordiante(lower, GeoportalDataViewerConstants.EPSG_4326,
							GeoportalDataViewerConstants.EPSG_3857);

					Coordinate upper = OLFactory.createCoordinate(bbox.getUpperRightX(), bbox.getUpperRightY());
					Coordinate upperCoord = MapUtils.transformCoordiante(upper, GeoportalDataViewerConstants.EPSG_4326,
							GeoportalDataViewerConstants.EPSG_3857);
					
					ew = new ExtentWrapped(lowerCoord.getX(), lowerCoord.getY(), upperCoord.getX(), upperCoord.getY());
					theBBOX = new BoundsMap(lowerCoord.getX(), lowerCoord.getY(), upperCoord.getX(), upperCoord.getY(), null);
				}
				
				olsm.addWMSLayer(mapServerHost, layerName, theBBOX);

				if (ew != null) {
				
					olsm.getMap().getView().fit(ew);

				}

			}
		});

	}
}