import java.io.*;

import java.util.zip.*;
import java.util.Vector;
import java.util.regex.*;
import java.util.Date;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.text.ParseException;


public class ZipIt {
	
	String zipFolder, zipPath, strDb, fullZipName, folderPath;
	FileOutputStream fos;
	ZipOutputStream zOut;
	String slash;
	
	boolean success;

	int len = 0;
	
	//used by buffers to write out the attached files
	byte b[] = new byte[ 512 ];
	
	ZipIt(){
		try {
			Date now = new Date();
			String dateString = now.toString();
	    		SimpleDateFormat format = new SimpleDateFormat("dd-MMM-yyyy_kkmmss");   

			//This uses the OS's tmp directory (so it can't be downloaded by anyone (outside HTML directory)).
			//Usually C:\Windows\Temp"
			folderPath = System.getProperty("java.io.tmpdir");
			slash = System.getProperty("file.separator");
			 
				
			//concatenates a short file name with the folder part to create the location for the zip file
			
			zipPath = folderPath + slash+ "dext"+slash+"backups"+slash+format.format(now);
		
			//the name of the zip file with path, unique zipfolder and zip suffix
			fullZipName = zipPath + slash+"DEXT_Backup_" + format.format(now) + ".zip";
		
			//Now we know where to, we can setup the required directories on the OS.
			File dir = new File( zipPath +slash+"articles");
			boolean exists = dir.exists();
			if( !exists ){
				//creates directory; all ancestor directories MUST exist
				success = ( dir ).mkdirs();
				
			} else {
				//if directory already exists the code empties its contents
				if (dir.isDirectory()) {
         				String[] children = dir.list();
					if (children.length > 0){
         					for (int i=0; i<children.length; i++) {
              					success = deleteDir(new File(dir, children[i]));
	              				//if (!success) 
     	              				//agentLog.logError( 200, "File deletion failed at line 436" );
         					}
    					} else {
						success = true;		
					}		
				}
			}
				
			//directory object is set to null for garbage collection
			dir = null;
		
			//Start the new Zip file
			fos = new FileOutputStream( fullZipName );
			zOut = new ZipOutputStream(fos);
	
		} catch(Exception e) {
			e.printStackTrace();
		}
	} 
	
	public String getFolderName(){
		return zipFolder;
	}
	
	public String getPath(){
		return zipPath;
	}

	public String getFullZipName(){
		return fullZipName;
	}
	
	public boolean addFile(String filePath) throws Exception{
		try {
			
			InputStream fis = new FileInputStream( zipPath+slash+filePath );
			zOut.putNextEntry( new ZipEntry( filePath ) );	

			len = 0;
		
			while(( len = fis.read( b )) != -1 ){
				zOut.write( b, 0, len );
			}
														
			zOut.flush();
			zOut.closeEntry();	
		
			fis.close();
			return true;
		
		} catch(Exception e) {
			e.printStackTrace();
			return false;
		}	
	}
	
	public void addNotesAttachment(String docId, InputStream in, String attachName) throws Exception{
		//make sure the $file sub-directory we need is there first
		File filedir = new File( zipPath+slash+"articles"+slash+docId + slash+"$file");
		boolean exists = filedir.exists();
		if( !exists ){
			//creates directory; all ancestor directories MUST exist
			success = ( filedir ).mkdirs();
		}
		OutputStream out = new FileOutputStream( zipPath+slash+"articles"+slash+docId + slash+"$file"+slash + attachName );
		//creates file
		len = 0;
		while(( len = in.read( b )) != -1 ){
			out.write( b, 0, len );
		}
						
		out.flush();
		out.close();

		//Add newly created file to this Zip
		addFile("articles"+slash+docId + slash+"$file"+slash + attachName);
	}
	
	public void close() throws Exception{
		try {
			//Close the output "streams" we've been using.
			zOut.close();
			fos.close();	
		} catch(Exception e){
			e.printStackTrace();
		}
	}
	
	public void finalise() throws Exception{
		try {
			//Remove the temporary working directory we've been using
			deleteDir(new File(zipPath));	
		} catch(Exception e){
			e.printStackTrace();
		}
	}
	
	/**************************************************************************************************************
	DELETE FILES AND SUBDIRECTORIES IN A PASSED DIR
	**************************************************************************************************************/
	private static boolean deleteDir(File dir) {
        if (dir.isDirectory()) {
            String[] children = dir.list();
            for (int i=0; i<children.length; i++) {
                	boolean success = deleteDir(new File(dir, children[i]));
                	if (!success) 
                    	return false;
            }
        }
    
        // The directory is now empty so delete it
        return dir.delete();
    }
}