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

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

/**
 * The Class FileUtil.
 *
 * @author Francesco Mangiacrapa at ISTI-CNR francesco.mangiacrapa@isti.cnr.it
 * 
 *         Dec 2, 2021
 */
public class FileUtil {

	/**
	 * Input stream to temp file.
	 *
	 * @param inputStream the input stream
	 * @param fileName    the file name
	 * @return the file
	 * @throws IOException Signals that an I/O exception has occurred.
	 */
	// InputStream -> Temp File
	public static File inputStreamToTempFile(InputStream inputStream, String fileName) throws IOException {

		File tempFile = File.createTempFile(fileName, ".tmp");
		// File tempFile = File.createTempFile("MyAppName-", ".tmp");
		try (FileOutputStream outputStream = new FileOutputStream(tempFile)) {

			int read;
			byte[] bytes = new byte[1024];

			while ((read = inputStream.read(bytes)) != -1) {
				outputStream.write(bytes, 0, read);
			}

			return tempFile;

		} finally {
			tempFile.deleteOnExit();
		}

	}

	/**
	 * Input stream to temp file.
	 *
	 * @param copyString the copy string
	 * @return
	 * @throws IOException Signals that an I/O exception has occurred.
	 */
	public static File inputStreamToTempFile(String copyString, String prefixFile) throws IOException {

		File targetFile = null;
		try {
			InputStream initialStream = new ByteArrayInputStream(copyString.getBytes());
			targetFile = File.createTempFile(prefixFile, ".tmp");

			java.nio.file.Files.copy(initialStream, targetFile.toPath(), StandardCopyOption.REPLACE_EXISTING);

			try {
				if (initialStream != null) {
					initialStream.close();
				}
			} catch (IOException ioe) {
				// ignore
			}
			return targetFile;
		} finally {
			try {
				if (targetFile != null)
					targetFile.deleteOnExit();
			} catch (Exception e) {

			}
		}
	}

	/**
	 * Copy input stream to file.
	 *
	 * @param is the is
	 * @param to the to
	 * @return the file
	 * @throws IOException Signals that an I/O exception has occurred.
	 */
	public static File copyInputStreamToFile(InputStream is, String to) throws IOException {
		Path dest = Paths.get(to);
		Files.copy(is, dest);
		return new File(to);
	}

}