import java.io.*;
import java.io.File;
import java.util.HashSet;


public class FileScanner extends Thread  {

    private String fileToScan;
    //TODO: Initialize the start value of the counter
    private static Long counter = 0L;

    public FileScanner (String fileToScan) {
        this.fileToScan=fileToScan;
        //TODO: Increment the counter on every creation of FileScanner object
       synchronized (this) {
           counter++;
       }

    }

    public static long getDirectorySize(File f){
        if(!f.isDirectory())
            return 0;
        long length = 0;

        for(File file : f.listFiles()){
            if(file.isFile())
                length+=file.length();
            else if(file.isDirectory())
                length+=getDirectorySize(file);
        }
        return length;
    }

    public static void printInfo(File file)  {

        /*
        * TODO: Print the info for the @argument File file, according to the requirement of the task
        * */


        if(file.isDirectory()){
            long size = getDirectorySize(file);
            System.out.println("dir: "+ file.getAbsolutePath()+" "+size);
        }
        else if(file.isFile())
            System.out.println("file: "+ file.getAbsolutePath()+" "+file.length());

    }

    public static Long getCounter () {
        return counter;
    }


    public void run() {

        //TODO Create object File with the absolute path fileToScan.
        File file = new File(fileToScan);

        //TODO Create a list of all the files that are in the directory file.
        File [] files =file.listFiles();


        HashSet<Thread> threads = new HashSet<>();

        for (File f : files) {
            /*
            * TODO If the File f is not a directory, print its info using the function printInfo(f)
            * */
            if(!f.isDirectory())
                printInfo(f);
            /*
            * TODO If the File f is a directory, create a thread from type FileScanner and start it.
            * */
            else {
               Thread thread= new FileScanner(f.getAbsolutePath());
                threads.add(thread);
                thread.start();



            }
            //TODO: wait for all the FileScanner-s to finish
            for(Thread t : threads){
                try{
                    t.join();
                }catch(InterruptedException e){
                    e.getStackTrace();
                }
            }
        }

    }

    public static void main (String [] args) throws InterruptedException {
        String FILE_TO_SCAN = "D:/OS-Projects/";

        //TODO Construct a FileScanner object with the fileToScan = FILE_TO_SCAN
        FileScanner fileScanner = new FileScanner(FILE_TO_SCAN);

        //TODO Start the thread from type FileScanner
        fileScanner.start();
        //TODO wait for the fileScanner to finish
        fileScanner.join();
        //TODO print a message that displays the number of thread that were created
        System.out.println(getCounter());

    }
}