/**
 *
 */
package org.gcube.datatransfer.resolver.services;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.xml.bind.JAXBException;

import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.common.scope.impl.ScopeBean;
import org.gcube.common.scope.impl.ScopeBean.Type;
import org.gcube.data.analysis.dminvocation.ActionType;
import org.gcube.data.analysis.dminvocation.DataMinerInvocationManager;
import org.gcube.data.analysis.dminvocation.model.DataMinerInputParams;
import org.gcube.data.analysis.dminvocation.model.DataMinerInvocation;
import org.gcube.data.analysis.dminvocation.model.DataMinerParam;
import org.gcube.data.analysis.dminvocation.model.DataMinerParameters;
import org.gcube.datatransfer.resolver.dataminer.DataMinerRequest;
import org.gcube.datatransfer.resolver.services.error.ExceptionManager;
import org.gcube.datatransfer.resolver.util.Util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * The Class DataMinerResolver.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 * Nov 28, 2018
 */
@Path("/analytics")
public class AnalyticsCreateResolver {


	/**
	 *
	 */
	private static final String UTF_8 = "UTF-8";
	private static Logger logger = LoggerFactory.getLogger(AnalyticsCreateResolver.class);
	private static String helpURI = "https://wiki.gcube-system.org/gcube/URI_Resolver";

	/**
	 * Post catalogue.
	 *
	 * @param req the req
	 * @param jsonRequest the json request
	 * @return the response
	 */
	@POST
	@Path("/create")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(MediaType.TEXT_PLAIN)
	public Response postCatalogue(@Context HttpServletRequest req, DataMinerRequest jsonRequest) {
		logger.info(this.getClass().getSimpleName()+" POST starts...");

		logger.info("The body contains the request: "+jsonRequest.toString());

		String scope = ScopeProvider.instance.get();
		String operatorID = jsonRequest.getOperatorId();

		if(scope==null || scope.isEmpty()){
			logger.error("The parameter 'scope' not found or empty in the JSON object");
			ExceptionManager.throwBadRequestException(req, "Mandatory body parameter 'scope' not found or empty in the JSON object", this.getClass(), helpURI);
		}


		if(operatorID==null || operatorID.isEmpty()){
			logger.error("The parameter 'operatorId' not found or empty in the JSON object");
			ExceptionManager.throwBadRequestException(req, "Mandatory body parameter 'operatorId' not found or empty in the JSON object", this.getClass(), helpURI);
		}

		ScopeBean scopeBean = new ScopeBean(scope);
		String publicLinkToDMInvFile = "";

		if(scopeBean.is(Type.VRE)){
			String vreName = scopeBean.name();
			try {

				String dataminerResolverURL = String.format("%s/%s",  Util.getServerURL(req), "dataminer/get");

				//Creating DM invocation file
				DataMinerInvocation dmInvocation = new DataMinerInvocation();
				dmInvocation.setOperatorId(operatorID);
				dmInvocation.setActionType(ActionType.RUN);

				DataMinerInputParams inputParams = new DataMinerInputParams();
				List<DataMinerParam> listParam = new ArrayList<DataMinerParam>();
				Map<String, String> parameters = jsonRequest.getParameters();
					for (String param : parameters.keySet()) {
						listParam.add(new DataMinerParam(param, parameters.get(param)));
					}

				inputParams.setListParam(listParam);
				dmInvocation.setParameters(new DataMinerParameters(inputParams, null));
				File tempInvocationFile = null;
				try {

					ByteArrayOutputStream xmlByteArray = DataMinerInvocationManager.marshaling(dmInvocation, org.gcube.data.analysis.dminvocation.MediaType.ApplicationXML);
					tempInvocationFile = createTempFile(operatorID+UUID.randomUUID(), ".xml", xmlByteArray.toByteArray());

					//CREATE THE FILE ON STORAGE HUB

				}
				catch (IOException | JAXBException e) {
					logger.error("Error on creating you request with "+dmInvocation+"", e);
					ExceptionManager.throwBadRequestException(req, "Error on creating you request with "+dmInvocation, this.getClass(), helpURI);
				}finally{
					//DELETING THE TEMP FILE
//					if(tempInvocationFile!=null && tempInvocationFile.exists())
//						tempInvocationFile.delete();
				}


				String dataMinerURL = String.format("%s/%s?%s=%s", dataminerResolverURL, vreName, "di", URLEncoder.encode(publicLinkToDMInvFile, UTF_8));
				logger.info("Returning Analytics URL: "+dataMinerURL);
				return Response.ok(dataMinerURL).header("Location", dataMinerURL).build();

			}
			catch (UnsupportedEncodingException e) {
				logger.error("Encoding error for "+publicLinkToDMInvFile+"", e);
				ExceptionManager.throwBadRequestException(req, "Error on encoding the public link "+publicLinkToDMInvFile, this.getClass(), helpURI);
			}

			return null;

		}else{
			logger.error("The input scope "+scope+" is not a VRE");
			ExceptionManager.throwBadRequestException(req, "Working in the "+scope+" scope that is not a VRE. Use a token of VRE", this.getClass(), helpURI);
		}

		return null;
	}


    /**
     * Creates the temp file.
     *
     * @param fileName the file name
     * @param extension the extension
     * @param data the data
     * @return the file
     * @throws IOException Signals that an I/O exception has occurred.
     */
    private static File createTempFile(String fileName, String extension, byte[] data) throws IOException {
        // Since Java 1.7 Files and Path API simplify operations on files
    	java.nio.file.Path path = Files.createTempFile(fileName, extension);
        File file = path.toFile();
        // writing sample data
        Files.write(path, data);
        logger.info("Created the temfile: "+file.getAbsolutePath());
        return file;
    }

}