package org.dclermonte.siba.model;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveOutputStream;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.utils.IOUtils;


public class SibaManager
{

public static File   backup(File toto,String destination) throws ArchiveException, IOException{
/*	String outputFileNameWithoutExtension = toto.getName()+"-"+ LocalDateTime.now(); */
	LocalDateTime date = LocalDateTime.now();
	DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'_'H'H_'m");
	String text = date.format(formatter);
	String outputFileNameWithoutExtension = toto.getName()+"-"+ text;
	String outputFileName = outputFileNameWithoutExtension + ".tgz";
	 File output = new File(destination+"/"+outputFileName);
	 
	 
	 final OutputStream out = new FileOutputStream(destination+"/"+outputFileName);
	 ArchiveOutputStream os = new ArchiveStreamFactory().createArchiveOutputStream(ArchiveStreamFactory.TAR, out);
	 directoryToSave(toto,os);
	 os.close();
	 md5(output,destination+"/"+outputFileNameWithoutExtension+".md5");
	return output;
}
public static void directoryToSave(File directory,ArchiveOutputStream outputStream) throws IOException{
	for(File file:directory.listFiles()){
		if (file.isDirectory()){
			directoryToSave(file,outputStream);
		}else{
			outputStream.putArchiveEntry(new TarArchiveEntry(file));
			 IOUtils.copy(new FileInputStream(file), outputStream);
			 outputStream.closeArchiveEntry();	
		}
	}
	
}
public static File   md5(File directoryToSave,String destination) throws IOException{
	 File saved = new File(destination);
	 try
	{
		 byte[] bytedirectoryToSave = new byte[(int) directoryToSave.length()] ; 
		 FileInputStream fileInputStream = new FileInputStream(directoryToSave);
		 for ( int index1 = 0 ;index1< directoryToSave.length();index1++)
		 {
			 bytedirectoryToSave[index1] = (byte) fileInputStream.read();
		 }
		
		 
		byte[] hash = null;
		MessageDigest messageDigest = MessageDigest.getInstance("MD5");
		hash = messageDigest.digest(bytedirectoryToSave);
		StringBuilder hashString = new StringBuilder();
		for (int index = 0; index < hash.length; index++)
		{
		        String hex = Integer.toHexString(hash[index]);
		        if (hex.length() == 1)
		        {
		                hashString.append('0');
		                hashString.append(hex.charAt(hex.length() - 1));
		        }
		        else
		                hashString.append(hex.substring(hex.length() - 2));
		}
		FileWriter fileWriter = new FileWriter(saved);
		fileWriter.write(hashString.toString());
		fileWriter.append(" " + directoryToSave.getName());
		fileWriter.close();
	}
	catch (NoSuchAlgorithmException e)
	{
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	 
	return saved;
}
public static void extract(File directoryToUntar, File destination) throws IOException, ArchiveException{
	 File file = destination;

     final List<File> untaredFiles = new LinkedList<File>();
        InputStream inputStream;
		try
		{
			inputStream = new FileInputStream(directoryToUntar);
		
		 
        final TarArchiveInputStream debInputStream = (TarArchiveInputStream) new ArchiveStreamFactory().createArchiveInputStream("tar", inputStream);
        TarArchiveEntry entry = null; 
        while ((entry = (TarArchiveEntry)debInputStream.getNextEntry()) != null) {
            final File outputFile = new File(file, entry.getName());
            if (entry.isDirectory()) {
                if (!outputFile.exists()) {
                    if (!outputFile.mkdirs()) {
                        throw new IllegalStateException(String.format("Couldn't create directory %s.", outputFile.getAbsolutePath()));
                    }
                }
            } else {
                final OutputStream outputFileStream = new FileOutputStream(outputFile); 
                IOUtils.copy(debInputStream, outputFileStream);
                outputFileStream.close();
            }
            untaredFiles.add(outputFile);
        }
        debInputStream.close(); }
        catch (FileNotFoundException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

 }
}