package monitorji;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.Stack;

public class Monitorji extends Applet {

  Stack cakaDodaj=new Stack (), cakaOdvzemi=new Stack ();
  int velikostPomn=10, velikostPocakaj=45, sirinaPocakaj=4, premor, polnostPomn, nasDodaj, nasOdvzemi;
  boolean pomnilnik []=new boolean [velikostPomn];
  Image puscicaGor, puscicaDol, semaforZelen, semaforRdec;
  PlatnoPuscici puscici=new PlatnoPuscici ();
  PlatnoSemaforja semaforja=new PlatnoSemaforja ();
  Panel prikazPomn []=new Panel [velikostPomn], prikazPocakaj []=new Panel [velikostPocakaj];
  Obdelava obdelovalec;

  boolean isStandalone = false;
  Button btDodaj = new Button();
  Button btOdvzemi = new Button();
  Scrollbar sbPremor = new Scrollbar();
  Label lblNiPolno = new Label();
  Label lblNiPrazno = new Label();
  Label lblNasDodamo = new Label();
  Label lblNasOdvzamemo = new Label();
  Label lblPremor = new Label();
  TextArea txtDodaj = new TextArea();
  TextArea txtOdvzemi = new TextArea();

  private void izpis () {
    int i;

    txtDodaj.setText ("");
    for (i=0; i<cakaDodaj.size (); i++)
      txtDodaj.setText (txtDodaj.getText ()+cakaDodaj.elementAt (i));
    txtOdvzemi.setText ("");
    for (i=0; i<cakaOdvzemi.size (); i++)
      txtOdvzemi.setText (txtOdvzemi.getText ()+cakaOdvzemi.elementAt (i));
  }

  private synchronized void izris () {
    int i;

    semaforja.repaint ();
    puscici.repaint ();

    for (i=0; i<velikostPomn; i++)
      if (pomnilnik [i])
        prikazPomn [i].setBackground (Color.blue);
      else
        prikazPomn [i].setBackground (Color.cyan);
  }

  private synchronized void dodaj () {
    cakaDodaj.pop ();
    izpis ();
    txtDodaj.append ("SIGNAL (ni prazno)\n");
    pomnilnik [nasDodaj]=true;
    nasDodaj=(nasDodaj+1)%velikostPomn;
    polnostPomn++;
  }

  private synchronized void odvzemi () {
    cakaOdvzemi.pop ();
    izpis ();
    txtOdvzemi.append ("SIGNAL (ni polno)\n");
    pomnilnik [nasOdvzemi]=false;
    nasOdvzemi=(nasOdvzemi+1)%velikostPomn;
    polnostPomn--;
  }

  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }
  /**Construct the applet*/
  public Monitorji() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      puscicaDol=getImage (getCodeBase (), "puscicaDol.gif");
      puscicaGor=getImage (getCodeBase (), "puscicaGor.gif");
      semaforZelen=getImage (getCodeBase (), "semaforZelen.gif");
      semaforRdec=getImage (getCodeBase (), "semaforRdec.gif");
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    int i;

    this.setLayout(null);
    btDodaj.setLabel("Dodaj");
    btDodaj.setBounds(new Rectangle(12, 12, 104, 27));
    btDodaj.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        btDodaj_actionPerformed(e);
      }
    });
    btOdvzemi.setLabel("Odvzemi");
    btOdvzemi.setBounds(new Rectangle(281, 11, 104, 27));
    btOdvzemi.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        btOdvzemi_actionPerformed(e);
      }
    });
    sbPremor.setOrientation(0);
    sbPremor.setMaximum(5001);
    sbPremor.setValue(1000);
    sbPremor.setVisibleAmount(1);
    sbPremor.setBounds(new Rectangle(171, 246, 145, 23));
    sbPremor.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseReleased(MouseEvent e) {
        sbPremor_mouseReleased(e);
      }
    });
    txtDodaj.setBounds(new Rectangle(12, 51, 257, 155));
    txtOdvzemi.setBounds(new Rectangle(281, 51, 257, 155));
    lblNiPolno.setText("ni polno");
    lblNiPolno.setBounds(new Rectangle(12, 220, 65, 17));
    lblNiPrazno.setText("ni prazno");
    lblNiPrazno.setBounds(new Rectangle(12, 249, 73, 17));
    lblNasDodamo.setText("Naslednjic dodamo:");
    lblNasDodamo.setBounds(new Rectangle(12, 290, 135, 17));
    lblNasOdvzamemo.setText("Naslednjic odvzamemo:");
    lblNasOdvzamemo.setBounds(new Rectangle(12, 350, 156, 17));
    lblPremor.setText("Premor (ms):");
    lblPremor.setBounds(new Rectangle(172, 220, 144, 17));

    semaforja.setBounds (90, 216, 50, 55);
    puscici.setBounds (175, 285, 345, 90);

    this.add(btDodaj, null);
    this.add(btOdvzemi, null);
    this.add(txtDodaj, null);
    this.add(txtOdvzemi, null);
    this.add(lblNiPolno, null);
    this.add(lblNiPrazno, null);
    this.add(lblNasDodamo, null);
    this.add(lblNasOdvzamemo, null);
    this.add(lblPremor, null);
    this.add(sbPremor, null);

    for (i=0; i<velikostPomn; i++) {
      prikazPomn [i]=new Panel ();
      prikazPomn [i].setBackground (Color.cyan);
      prikazPomn [i].setBounds (175+35*i, 315, 30, 30);
      this.add (prikazPomn [i]);
    }
    for (i=0; i<velikostPocakaj; i++) {
      prikazPocakaj [i]=new Panel ();
      prikazPocakaj [i].setBackground (new Color ((int)(255/(velikostPocakaj-1)*i), 0, (int)(255-255/(velikostPocakaj-1)*i)));
      prikazPocakaj [i].setVisible (false);
      prikazPocakaj [i].setBounds (350+sirinaPocakaj*i, 230, sirinaPocakaj, 30);
      this.add (prikazPocakaj [i]);
    }
    this.add (semaforja);
    this.add (puscici);
  }
  /**Start the applet*/
  public void start() {
    int i;

    cakaDodaj.empty ();
    cakaOdvzemi.empty ();
    for (i=0; i<velikostPomn; i++)
      pomnilnik [i]=false;
    nasDodaj=0;
    nasOdvzemi=0;
    polnostPomn=0;
    premor=1000;
    obdelovalec=new Obdelava ();
    obdelovalec.start ();
    lblPremor.setText("Premor (ms): "+premor);
  }
  /**Stop the applet*/
  public void stop() {
  }
  /**Destroy the applet*/
  public void destroy() {
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void btDodaj_actionPerformed(ActionEvent e) {
    cakaDodaj.push ("WAIT (ni polno)\n");
    obdelovalec=new Obdelava ();
    obdelovalec.start ();
  }

  void btOdvzemi_actionPerformed(ActionEvent e) {
    cakaOdvzemi.push ("WAIT (ni prazno)\n");
    obdelovalec=new Obdelava ();
    obdelovalec.start ();
  }

  void sbPremor_mouseReleased(MouseEvent e) {
    premor=sbPremor.getValue ();
    lblPremor.setText("Premor (ms): "+premor);
  }

  public class PlatnoSemaforja extends Canvas {

    public void paint (Graphics grf) {
      if (polnostPomn<velikostPomn)
        grf.drawImage (semaforZelen, 0, 0, this);
      else
        grf.drawImage (semaforRdec, 0, 0, this);
      if (polnostPomn>0)
        grf.drawImage (semaforZelen, 0, 30, this);
      else
        grf.drawImage (semaforRdec, 0, 30, this);
    }
  }

  public class PlatnoPuscici extends Canvas {

    public void paint (Graphics grf) {
      grf.drawImage (puscicaDol, 7+nasDodaj*35, 0, this);
      grf.drawImage (puscicaGor, 7+nasOdvzemi*35, 70, this);
    }
  }

  public class Obdelava extends Thread {

    private void pocakaj () {
      int i;

      btDodaj.setEnabled (false);
      btOdvzemi.setEnabled (false);

      for (i=0; i<velikostPocakaj; i++) {
        if (premor>=500)
          prikazPocakaj [i].setVisible (true);
        try {
          sleep ((int)(premor/2/velikostPocakaj));
        } catch (InterruptedException e) {
        }
      }
      for (i=0; i<velikostPocakaj; i++) {
        if (premor>=500)
          prikazPocakaj [i].setVisible (false);
        try {
          sleep ((int)(premor/2/velikostPocakaj));
        } catch (InterruptedException e) {
        }
      }

      btDodaj.setEnabled (true);
      btOdvzemi.setEnabled (true);
    }

    public void run () {
      izpis ();

      if ((polnostPomn<velikostPomn) && (!cakaDodaj.empty ())) {
        pocakaj ();
        dodaj ();
        izris ();
      }
      if ((polnostPomn>0) && (!cakaOdvzemi.empty ())) {
        pocakaj ();
        odvzemi ();
        izris ();
      }
      if ((polnostPomn<velikostPomn) && (!cakaDodaj.empty ())) {
        pocakaj ();
        dodaj ();
        izris ();
      }
    }
  }
}