import java.io.*;
import javax.swing.*;

public class MovingFile{
	public static void main(String[] args) throws IOException{
		int a = 0;
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		System.out.print("Enter the file or directory name that has to be moved : ");
		String src = in.readLine();
		if(src.equals("")){
			System.out.println("Invalid directory or file name.");
			System.exit(0);
		}
		File source = new File(src);
		if(!source.exists()){
			System.out.println("File or directory does not exist.");
			System.exit(0);
		}
		System.out.print("Enter the complete path where file or directory has to moved: ");
		String dest = in.readLine();
		if(dest.equals("")){
			System.out.println("Invalid directory or file name.");
			System.exit(0);
		}
		File destination = new File(dest);
		if(!destination.exists()){
			System.out.print("Mentioned directory does not exist.\nDo you want to create a new directory(Y/N)? ");
			String chk = in.readLine();
			if(chk.equals("Y") || chk.equals("y")){
				destination.mkdir();
				copyDirectory(source, destination);
				a = 1;
			}
			else if(chk.equals("N") || chk.equals("n")){
				System.exit(0);
			}
			else{
				System.out.println("Invalid Entry!");
				System.exit(0);
			}
		}
		else{
			int num = JOptionPane.showConfirmDialog(null,"Given file or folder name already exists.\nDo you want to replace now?");
			if(num == 0){
				copyDirectory(source, destination);
				a = 1;
			}
		}
		if(a == 1){
			System.out.println("File or directory moved successfully.");
			if(!delete(source)){
				throw new IOException("Unable to delete original folder");
			}
		}
		else if(a == 0){
			System.exit(0);
		}
	}

	public static void copyDirectory(File sourceDir, File destDir) throws IOException{
		if(!destDir.exists()){
			destDir.mkdir();
		}
		File[] children = sourceDir.listFiles();
		for(File sourceChild : children){
			String name = sourceChild.getName();
			File destChild = new File(destDir, name);
			if(sourceChild.isDirectory()){
				copyDirectory(sourceChild, destChild);
			}
			else{
				copyFile(sourceChild, destChild);
			}
		}
	}
	
	public static void copyFile(File source, File dest) throws IOException{
		if(!dest.exists()){
			dest.createNewFile();
		}
		InputStream in = null;
		OutputStream out = null;
		try{
			in = new FileInputStream(source);
			out = new FileOutputStream(dest);
			byte[] buf = new byte[1024];
			int len;
			while((len = in.read(buf)) > 0){
				out.write(buf, 0, len);
	        }
        }
		finally{
			in.close();
            out.close();
        }
	}

	public static boolean delete(File resource) throws IOException{ 
		if(resource.isDirectory()){
			File[] childFiles = resource.listFiles();
			for(File child : childFiles){
				delete(child);
			}
		}
		return resource.delete();
	}
}