package mk.ukim.finki.os.filemanagement.exam14march;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.List;

import mk.ukim.finki.os.filemanagement.exam.ExamSolution;
import mk.ukim.finki.os.filemanagement.exam.IExamIO;
import mk.ukim.finki.os.filemanagement.exam.TestExam;

public class ExamIO implements IExamIO {

    @Override
    public void copyLargeTxtFiles(String from, String to, long size)
            throws IOException {
        File from1 = new File(from);
        File to1 = new File(to);
        File[] lista = from1.listFiles();
        if(!from1.exists()){
            System.out.println("Ne postoi");
        }
        else{
            if(!to1.exists()){
                to1.mkdirs();
            }
            for(int i = 0; i < lista.length; i++){
                if(lista[i].toString().contains(".txt")){
                    if(lista[i].length() > size)
                        lista[i].renameTo(new File(to1, lista[i].getName()));
                }
            }
        }
    }

    @Override
    public void serializeData(String destination, List<byte[]> data)
            throws IOException {
        FileOutputStream d1 = new FileOutputStream(destination);
        for(int i = 0; i < data.size(); i++){
            d1.write(data.get(i));
        }
        d1.close();
    }

    @Override
    public byte[] deserializeDataAtPosition(String source, long position, int elementLength)
            throws IOException {
        RandomAccessFile f1 = new RandomAccessFile(source, "r");
        String s = "";
        f1.seek(position*elementLength);
        for(int i = 0; i < elementLength; i++){
            s += (char)f1.read();
        }
        f1.close();
        return s.getBytes();
    }

    public static void main(String[] args) throws IOException {
        ExamIO examIO = new ExamIO();

        ExamSolution ex = new ExamSolution();

        TestExam.testCopy(examIO);
        TestExam.testSerialize(examIO);
        TestExam.testDeserializeDataAtPosition(examIO);
    }
}