package org.gcube.portlets.user.geoportaldataviewer.server;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.gcube.portlets.user.geoportaldataviewer.client.GeoportalDataViewerService;
import org.gcube.portlets.user.geoportaldataviewer.server.gis.FeatureParser;
import org.gcube.portlets.user.geoportaldataviewer.server.gis.WMSUrlValidator;
import org.gcube.portlets.user.geoportaldataviewer.shared.GeoNaDataObject;
import org.gcube.portlets.user.geoportaldataviewer.shared.gis.BoundsMap;
import org.gcube.portlets.user.geoportaldataviewer.shared.gis.GeoInformationForWMSRequest;
import org.gcube.portlets.user.geoportaldataviewer.shared.gis.LayerItem;
import org.gcube.portlets.user.geoportaldataviewer.shared.gis.Styles;
import org.gcube.portlets.user.geoportaldataviewer.shared.gis.ZAxis;
import org.gcube.spatial.data.geoutility.GeoNcWMSMetadataUtility;
import org.gcube.spatial.data.geoutility.bean.LayerStyles;
import org.gcube.spatial.data.geoutility.bean.LayerZAxis;
import org.gcube.spatial.data.geoutility.bean.WmsParameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

/**
 * The server side implementation of the RPC service.
 */
@SuppressWarnings("serial")
public class GeoportalDataViewerServiceImpl extends RemoteServiceServlet implements
    GeoportalDataViewerService {
	
	/** The Constant LOG. */
	private static final Logger LOG = LoggerFactory.getLogger(GeoportalDataViewerServiceImpl.class);

	@Override
	public GeoInformationForWMSRequest parseWmsRequest(String wmsRequest, String layerName) throws Exception {
		return loadGeoInfoForWmsRequest(wmsRequest, layerName);
	}
	
	/* Load geo info for wms request.
	 *
	 * @param wmsRequest the wms request
	 * @param layerName the layer name
	 * @return the gis viewer wms valid parameters
	 * @throws Exception the exception
	 */
	public static GeoInformationForWMSRequest loadGeoInfoForWmsRequest(String wmsRequest, String layerName) throws Exception{
		try {
			WMSUrlValidator validator = new WMSUrlValidator(wmsRequest, layerName);
			String wmsServiceHost = validator.getWmsServiceHost();
			String validWMSRequest = validator.parseWMSRequest(true, true);
			layerName = validator.getLayerName();
			String versionWms = validator.getValueOfParsedWMSParameter(WmsParameters.VERSION);
			String crs = validator.getValueOfParsedWMSParameter(WmsParameters.CRS);
	//
			HashMap<String, String> mapWmsNotStandard = new HashMap<String, String>();

			if(validator.getMapWmsNoStandardParams()!=null){
				mapWmsNotStandard.putAll(validator.getMapWmsNoStandardParams());
			}
	//
			GeoNcWMSMetadataUtility geoGS = new GeoNcWMSMetadataUtility(validWMSRequest, 4000);
			//STYLES
			LayerStyles layerStyle  = geoGS.loadStyles();
			Map<String,String> mapNcWmsStyles = layerStyle.getMapNcWmsStyles()==null?new HashMap<String, String>(1):layerStyle.getMapNcWmsStyles();
			mapWmsNotStandard.putAll(mapNcWmsStyles);
			//MAP STYLES INTO GWT-SERIALIZABLE OBJECT
			Styles styles = new Styles(layerStyle.getGeoStyles(), layerStyle.getMapNcWmsStyles(), layerStyle.isNcWms());
			//ZAxis
			LayerZAxis layerZAxis = geoGS.loadZAxis();
			//MAP ZAXIS INTO GWT-SERIALIZABLE OBJECT
			ZAxis zAxis = layerZAxis!=null?new ZAxis(layerZAxis.getUnits(), layerZAxis.isPositive(), layerZAxis.getValues()):null;

			return new GeoInformationForWMSRequest(wmsServiceHost, validWMSRequest, layerName, versionWms, crs, mapWmsNotStandard, styles, styles.isNcWms(), zAxis);
		}
		catch (Exception e) {
			String msg = "An error occurred during wms request validation for layer: "+layerName;
			LOG.error(msg,e);
			throw new Exception(msg);
		}
	}
	
	/* (non-Javadoc)
	 * @see org.gcube.portlets.user.gisviewer.client.GisViewerService#getDataResult(java.util.List, java.lang.String, int)
	 */
	@Override
	public List<GeoNaDataObject> getDataResult(List<LayerItem> layerItems, String mapSrsName, BoundsMap mapBBOX, int maxWFSFeature, double zoomLevel) {
		LOG.info("getDataResult called");
		List<GeoNaDataObject> result = FeatureParser.getDataResults(layerItems, mapSrsName, mapBBOX, maxWFSFeature);
		return result;
	}

}