package updater;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import javax.imageio.ImageIO;
import javax.swing.SwingUtilities;

public class Main {

    private static final String windowTitle = "Network Control Update";
    private static final String url = "http://10.10.0.52/radek/test.zip";
    private static final String jarApp = "NetworkControlClient.jar";

    private static Window okno = new Window();

    public static void main(String[] args) {
        okno.setTitle(windowTitle);
        okno.setLocationRelativeTo(null);
        okno.setVisible(true);

        try {
            okno.setIconImage(ImageIO.read(new File("img/app.png")));
        } catch (IOException ex) {
            System.err.println("APP icon exception");
        }

        Thread t = new Thread() {
            @Override
            public void run() {
                super.run();
                // stahovani aktualizacniho souboru
                System.out.print("Stahovani souboru ...");
                Window.label.setText("Stahování aktualizace ...");
                download(url);
                System.out.println(" hotovo");

                // rozbaleni souboru
                System.out.print("Aktualizace ...");
                Window.label.setText("Aktualizace ...");
                unZipIt("update.zip");
                System.out.println(" hotovo");
                
                // spusteni programu po aktualizaci
                launch(jarApp);
                
                // ukonceni programu 
                System.exit(0);
            }
        ;
        };
        t.run();
        
        
    }
    
    private static void download(String urlFile){
        try {
                    URL url = new URL(urlFile);
                    HttpURLConnection httpConnection = (HttpURLConnection) (url.openConnection());
                    // zjisteni veliksoti souboru
                    long completeFileSize = httpConnection.getContentLength();
                    // nastaveni velikosti progress bar
                    Window.pb.setMaximum((int) completeFileSize);
                    // stahovani 
                    BufferedInputStream in = new BufferedInputStream(httpConnection.getInputStream());
                    FileOutputStream fos = new FileOutputStream("update.zip");
                    BufferedOutputStream bout = new BufferedOutputStream(fos, 1024);
                    byte[] data = new byte[1024];
                    long downloadedFileSize = 0;
                    int x = 0;
                    while ((x = in.read(data, 0, 1024)) >= 0) {
                        downloadedFileSize += x;
                        // vypocet progressu
                        final int currentProgress = (int) downloadedFileSize;
                        // update progress bar
                        SwingUtilities.invokeLater(new Runnable() {
                            @Override
                            public void run() {
                                Window.pb.setValue(currentProgress);
                            }
                        });
                        bout.write(data, 0, x);
                    }
                    bout.close();
                    in.close();
                } catch (Exception ex) {
                    Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
                }
    }

    public static void unZipIt(String zipFile) {

        byte[] buffer = new byte[1024];

        try {

            //get the zip file content
            ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));
            //get the zipped file list entry
            ZipEntry ze = zis.getNextEntry();

            while (ze != null) {
                if (ze.isDirectory()) {
                    System.out.println("Creating Directory:" + ze.getName());
                    FileSystem fileSystem = FileSystems.getDefault();
                    Files.createDirectories(fileSystem.getPath(ze.getName()));
                } else {
                    String fileName = ze.getName();
                    File newFile = new File(fileName);

                    System.out.println("file unzip : " + newFile.getAbsoluteFile());

                    FileOutputStream fos = new FileOutputStream(newFile);
                    int len;
                    while ((len = zis.read(buffer)) > 0) {
                        fos.write(buffer, 0, len);
                    }

                    fos.close();

                }
                ze = zis.getNextEntry();
            }

            zis.closeEntry();
            zis.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
    
    private static void launch(String jar) {
        String[] run = {"java", "-jar", jar};
        try {
            Runtime.getRuntime().exec(run);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

}