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

import static org.gcube.application.geoportal.client.GeoportalAbstractPlugin.mongoConcessioni;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.gcube.application.geoportal.common.rest.MongoConcessioni;
import org.gcube.application.geoportal.common.rest.TempFile;
import org.gcube.application.geoportal.common.utils.StorageUtils;
import org.gcube.contentmanagement.blobstorage.transport.backend.RemoteBackendException;
import org.gcube.portlets.widgets.mpformbuilder.shared.upload.FileUploaded;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Class ServiceUtil.
 *
 * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
 * 
 *         Jan 28, 2021
 */
public class ServiceUtil {

	private static Logger LOG = LoggerFactory.getLogger(ServiceUtil.class);

	/**
	 * Gets the instance mongo concessioni.
	 *
	 * @return the instance mongo concessioni
	 */
	public MongoConcessioni getInstanceMongoConcessioni() {
		return mongoConcessioni().build();
	}

	/**
	 * Creates the temp file on storage.
	 *
	 * @param is       the is
	 * @param fileName the file name
	 * @return the temp file
	 */
	public TempFile createTempFileOnStorage(InputStream is, String fileName) {
		LOG.debug("createTempFileOnStorage called");
		StorageUtils storage = new StorageUtils();
		TempFile toUpload = null;
		try {
			LOG.info("calling putOntoStorage the stream with the fileName: " + fileName);
			toUpload = storage.putOntoStorage(is, fileName);
		} catch (RemoteBackendException | FileNotFoundException e) {
			LOG.error("Error when uploading stream on Storage: ", e);
		}
		return toUpload;
	}

	/**
	 * To tem files.
	 *
	 * @param listFileUploaded the list file uploaded
	 * @return the list
	 */
	public List<TempFile> toTemFiles(List<FileUploaded> listFileUploaded) {
		LOG.debug("toTemFiles called");
		if (listFileUploaded == null || listFileUploaded.isEmpty())
			return null;

		// Building TempFile
		List<TempFile> files = new ArrayList<TempFile>(listFileUploaded.size());
		for (FileUploaded fileUploaded : listFileUploaded) {
			FileInputStream fis;
			try {
				fis = new FileInputStream(fileUploaded.getTempSystemPath());
				// Creating TempFile
				TempFile storageTempFile = createTempFileOnStorage(fis, fileUploaded.getFileName());
				files.add(storageTempFile);
			} catch (FileNotFoundException e) {
				LOG.error("Error on loading temp file with path: " + fileUploaded.getTempSystemPath(), e);
			}
		}
		return files;
	}
	
	
	/**
	 * To JSON.
	 *
	 * @param <T> the generic type
	 * @param report the report
	 * @return the string
	 */
	public String toJSON(Object theObj) {
		LOG.debug("toJSON called");
		try {
			
			if(theObj instanceof Serializable) {
				return org.gcube.application.geoportal.client.utils.Serialization.write(theObj);
			}
			throw new Exception("The input object is not serializable");
			
		} catch (Exception e) {
			LOG.warn("Error on deserializing: ", e);
			return null;
		}
	}

}