package org.gcube.application.cms.concessioni.sdi;

import it.geosolutions.geoserver.rest.GeoServerRESTPublisher;
import it.geosolutions.geoserver.rest.GeoServerRESTReader;
import it.geosolutions.geoserver.rest.decoder.RESTFeatureType;
import it.geosolutions.geoserver.rest.decoder.RESTLayer;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.bson.Document;
import org.gcube.application.cms.concessioni.sdi.faults.SDIInteractionException;
import org.gcube.application.cms.plugins.requests.BaseExecutionRequest;
import org.gcube.application.cms.serialization.Serialization;
import org.gcube.application.geoportal.common.model.document.filesets.GCubeSDILayer;

import org.gcube.application.geoportal.common.model.document.filesets.RegisteredFile;
import org.gcube.application.geoportal.common.model.document.filesets.RegisteredFileSet;

import org.gcube.application.geoportal.common.utils.Files;



import org.gcube.data.transfer.library.DataTransferClient;
import org.gcube.data.transfer.library.TransferResult;
import org.gcube.data.transfer.model.Destination;
import org.gcube.data.transfer.model.DestinationClashPolicy;
import org.gcube.spatial.data.gis.GISInterface;
import org.gcube.spatial.data.gis.is.AbstractGeoServerDescriptor;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

@Slf4j
public class SDIManager {


	static private final String EPSG_4326="EPSG:4326";
	static private final String WGS84_FULL="GEOGCS[\"WGS 84\", DATUM[\"World Geodetic System 1984\", SPHEROID[\"WGS 84\", 6378137.0, 298.257223563, AUTHORITY[\"EPSG\",\"7030\"]],"+
			"AUTHORITY[\"EPSG\",\"6326\"]], PRIMEM[\"Greenwich\", 0.0, AUTHORITY[\"EPSG\",\"8901\"]],  UNIT[\"degree\", 0.017453292519943295],"+
			"AXIS[\"Geodetic longitude\", EAST],  AXIS[\"Geodetic latitude\", NORTH],  AUTHORITY[\"EPSG\",\"4326\"]]";


	public static final Pattern HOSTNAME_PATTERN=Pattern.compile("(?<=\\:\\/\\/)[^\\:]*");
	public static final Pattern PORT_PATTERN=Pattern.compile("(?<=\\:)[\\d]+");
	public static final Pattern DB_NAME_PATTERN=Pattern.compile("(?<=\\/)[^\\/]*(?=$)");


	private final GISInterface gis;
	@Getter
	private final DataTransferClient dtGeoServer;
	@Getter
	private final String geoserverHostName;
	@Getter
	private final AbstractGeoServerDescriptor currentGeoserver;


	public SDIManager() throws SDIInteractionException {
		try{
			log.debug("Initializing GIS Interface..");
			gis=GISInterface.get();
			currentGeoserver=gis.getCurrentGeoServer();
			if(currentGeoserver==null)
				throw new Exception("Unable to contact data transfer for geoserver ");

			log.debug("Found geoserver descriptor "+currentGeoserver);
			geoserverHostName=new URL(currentGeoserver.getUrl()).getHost();

			log.debug("Contacting Data Transfer from geoserver {} ",geoserverHostName);
			dtGeoServer=DataTransferClient.getInstanceByEndpoint("https://"+geoserverHostName);
			if(!currentGeoserver.getReader().existGeoserver())
				throw new Exception("Geoserver not reachable");
		}catch(Exception e) {
			throw new SDIInteractionException("Unable to initialize SDI Manager",e);
		}
	}

	/**
	 * Expected paramters :
	 * 		- "workspace"
	 *      - "layerTitle"
	 *      - "documentID"
	 *    	- "basePersistencePath" (profile specific, e.g. "GNA")
	 *
	 * @param fileSet
	 * @param params
	 * @return
	 * @throws SDIInteractionException
	 */
	public RegisteredFileSet materializeLayer(RegisteredFileSet fileSet, Document params) throws SDIInteractionException{
		try {
			log.debug("Materializing FS {} on {} ", fileSet, geoserverHostName);

			// validate parameters
			String workspace = BaseExecutionRequest.getMandatory("workspace", params);
			String documentID = BaseExecutionRequest.getMandatory("documentID", params);
			String basePersistencePAth = BaseExecutionRequest.getMandatory("basePersistencePath", params);


			// check if empty
			if (fileSet.getPayloads().isEmpty()) throw new SDIInteractionException("No payload to materialize");


			Document geoserverInfo = new Document();
			geoserverInfo.put("_type", "Geoserver");
			geoserverInfo.put("workspace", workspace);


			// Evaluate Layer Name
			String baseName = getToUseBaseLayerName(fileSet);
			log.debug("Base layer name is {}, checking conflicts.. ");
			String toSetLayerName = baseName;
			//Check if layer already exists
			int count = 0;
			GeoServerRESTReader gsReader = currentGeoserver.getReader();
			while (gsReader.getLayer(workspace, toSetLayerName) != null) {
				count++;
				toSetLayerName = baseName + "_" + count;
				log.debug("layer for " + baseName + " already existing, trying " + toSetLayerName);
			}
			geoserverInfo.put("layerName", toSetLayerName);
			log.debug("Layer name will be {} ", toSetLayerName);


			String folderRelativePath = basePersistencePAth + "/" + documentID + "/" + fileSet.getUUID() + "/" + toSetLayerName;
			log.debug("GS Relative destination path is {} ", folderRelativePath);
			geoserverInfo.put("persistencePath", folderRelativePath);

			List<String> filenames = new ArrayList<>();

			String absolutePath = null;

			for (Object o : fileSet.getPayloads()) {
				RegisteredFile file = Serialization.convert(o, RegisteredFile.class);
				log.info("Sending {} to GS {} at {} ", file, geoserverHostName, folderRelativePath);
				String completeFilename = Files.fixFilename(file.getName());
				completeFilename = completeFilename.replaceAll(baseName, toSetLayerName);


				Destination destination = new Destination(completeFilename);
				destination.setCreateSubfolders(true);
				destination.setOnExistingFileName(DestinationClashPolicy.REWRITE);
				destination.setOnExistingSubFolder(DestinationClashPolicy.APPEND);

				destination.setPersistenceId("geoserver");
				destination.setSubFolder(folderRelativePath);

				log.debug("Sending {} to {}", file, destination);
				TransferResult result = getDtGeoServer().httpSource(new URL(file.getLink()), destination);
				log.debug("Transferred " + result);


				filenames.add(completeFilename);
				// NB Clash con subfolder is APPEND, thus FOLDER is expected to be the one specified by caller
				//geoserverInfo.put(""result.getRemotePath().substring(0, result.getRemotePath().lastIndexOf("/")));
				absolutePath = result.getRemotePath().substring(0, result.getRemotePath().lastIndexOf("/"));
			}
			geoserverInfo.put("files", filenames);

			// Publishing layer in GS
			String storeName = toSetLayerName + "_store";
			geoserverInfo.put("storeName", storeName);

			GeoServerRESTPublisher publisher = currentGeoserver.getPublisher();
			log.debug("Trying to create remote workspace : " + workspace);
			createWorkspace(workspace);


			log.debug("Publishing remote folder " + absolutePath);

			URL directoryPath = new URL("file:" + absolutePath + "/" + toSetLayerName + ".shp");

			//TODO Evaluate SRS

			boolean published = publisher.publishShp(
					workspace,
					storeName,
					null,
					toSetLayerName,
					//					UploadMethod.FILE, // neeeds zip
					GeoServerRESTPublisher.UploadMethod.EXTERNAL, // needs shp
					directoryPath.toURI(),
					EPSG_4326, //SRS
					""); // default style

			if (!published) {
				throw new SDIInteractionException("Unable to publish layer " + toSetLayerName + " under " + workspace + ". Unknown Geoserver fault.");
			}

			RESTLayer l = gsReader.getLayer(workspace, toSetLayerName);
			RESTFeatureType f = gsReader.getFeatureType(l);
			/*https://geoserver1.dev.d4science.org/geoserver/gna_conc_18/wms?
			service=WMS&version=1.1.0&request=GetMap&layers=gna_conc_18:pos&
			styles=&bbox=8.62091913167495,40.62975046683799,8.621178639172953,40.630257904721645&
			width=392&height=768&srs=EPSG:4326&format=application/openlayers */


			List<Document> ogcLinks = new ArrayList<>();

			Document wmsLink = new Document();
			wmsLink.put("wms", String.format("https://%1$s/geoserver/%2$s/wms?"
							+ "service=WMS&version=1.1.0&request=GetMap&layers=%2$s:%3$s&"
							+ "styles=&bbox=%4$f,%5$f,%6$f,%7$f&srs=%8$s&format=application/openlayers&width=%9$d&height=%10$d",
					geoserverHostName,
					workspace,
					toSetLayerName,
					f.getMinX(),
					f.getMinY(),
					f.getMaxX(),
					f.getMaxY(),
					EPSG_4326,
					400,
					400));
			ogcLinks.add(wmsLink);

			List<Document> platformInfo = new ArrayList<>();
			platformInfo.add(geoserverInfo);
			// TODO Metadata


			// Materialization object
			GCubeSDILayer materialization = new GCubeSDILayer();
			materialization.put(GCubeSDILayer.OGC_LINKS, ogcLinks);
			materialization.put(GCubeSDILayer.B_BOX, new GCubeSDILayer.BBOX(f.getMaxX(), f.getMaxY(), f.getMinX(), f.getMinY()));
			materialization.put(GCubeSDILayer.PLATFORM_INFO, platformInfo);

			log.info("Generated Materialization {}", materialization);

			//Add Materialization to registered file set
			List materializations = fileSet.getMaterializations();
			if (materializations == null) materializations = new ArrayList();
			materializations.add(materialization);
			fileSet.put(RegisteredFileSet.MATERIALIZATIONS, materializations);

			return fileSet;
		}catch(SDIInteractionException e){
			throw e;
		}catch (Throwable t){
			throw new SDIInteractionException("Unexpected exception while trying to materialize File Set "+t.getMessage(),t);
		}
	}


	public String createWorkspace(String toCreate) throws SDIInteractionException {
		try {
			if(!currentGeoserver.getReader().getWorkspaceNames().contains(toCreate)) {
				log.debug("Creating workspace : "+toCreate);
				if(!currentGeoserver.getPublisher().createWorkspace(toCreate))
					throw new SDIInteractionException("Unable to create workspace "+toCreate);
			}else log.debug("Workspace "+toCreate+" exists.");
			return toCreate;
		} catch (IllegalArgumentException | MalformedURLException e) {
			throw new SDIInteractionException("Unable to create workspace "+toCreate,e);
		}
	}


	private static final String getToUseBaseLayerName(RegisteredFileSet fileset){
		// ******** IDENTIFY LAYER NAME correct layer name
		// Must be unique under same WS
		// equal to shp base name

		String baseName= "";

		// Chose layer name first identifying filename
		for(Object p:fileset.getPayloads()){
				RegisteredFile f = Serialization.convert(p,RegisteredFile.class);
				String name=f.getName();
				if(name.endsWith(".shp")) {
					log.debug("SHP is {}",name);
					baseName= Files.fixFilename(name.substring(0,name.lastIndexOf('.')));
					break;
				}
			}
		return baseName;
	}




}