import java.io.File;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.time.LocalDateTime;

import java.time.format.DateTimeFormatter;

import java.util.ArrayList;

import java.util.List;

public class FileBackup {

private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss");

private static final String BACKUP_DIR = "backups"; // Directory to store backups

public static void main(String[] args) {

if (args.length != 2) {

System.err.println("Usage: java FileBackup <source_directory> <destination_directory>");

System.exit(1);

}

String sourceDir = args[0];

String destDir = args[1];

File source = new File(sourceDir);

File dest = new File(destDir);

if (!source.exists()) {

System.err.println("Source directory does not exist: " + sourceDir);

System.exit(1);

}

if (!dest.exists()) {

if (!dest.mkdirs()) {

System.err.println("Failed to create destination directory: " + destDir);

System.exit(1);

}

}

backupDirectory(source, dest);

}

public static void backupDirectory(File source, File dest) {

String timestamp = LocalDateTime.now().format(formatter);

String backupFileName = "backup_" + timestamp;

File backupDir = new File(dest, backupFileName);

try {

if (!backupDir.mkdirs()) {

System.err.println("Failed to create backup directory: " + backupDir);

return;

}

backupDirectoryHelper(source, backupDir);

System.out.println("Backup completed successfully to: " + backupDir.getAbsolutePath());

} catch (IOException e) {

System.err.println("Error during backup: " + e.getMessage());

}

}

private static void backupDirectoryHelper(File source, File dest) throws IOException {

List<String> files = new ArrayList<>();

for (File file : source.listFiles()) {

String filePath = file.getAbsolutePath();

String relativePath = file.getAbsolutePath().replace(source.getAbsolutePath(), "");

files.add(relativePath);

}

for (String relativePath : files) {

Path sourcePath = Paths.get(source.getAbsolutePath() + "/" + relativePath);

Path destPath = Paths.get(dest.getAbsolutePath() + "/" + relativePath);

Files.copy(sourcePath, destPath);

System.out.println("Copied: " + sourcePath + " to " + destPath);

}

}

}