//=====================================================================
// File: ChuaApplet.java
//
//=====================================================================

import java.applet.Applet;
import java.awt.*;
import java.lang.*;

public class ChuaApplet extends Applet implements Runnable {

  ChuaCanvas equationCanvas;
  Thread thread;
  Button stopStart;
  TextField xText, yText, zText;
  TextField tminx, tmaxx, tminy, tmaxy;
  TextField tc1, tc2, tc3, tm0, tm1;


  public void init() {
    setLayout(new BorderLayout());

    //----------------
    // Get parameters
    //----------------
    String str = new String();

    str = getParameter("initial_x");
    double initialx = Double.valueOf(str).doubleValue();

    str = getParameter("initial_y");
    double initialy = Double.valueOf(str).doubleValue();

    str = getParameter("initial_z");
    double initialz = Double.valueOf(str).doubleValue();

    str = getParameter("time_step");
    double stepSize = Double.valueOf(str).doubleValue();

    str = getParameter("interface_on");
    boolean buttonsOn=true;
    if(str!=null){ Boolean.valueOf(str).booleanValue();}


    str = getParameter("maximum_x");
    double domainMaxx = Double.valueOf(str).doubleValue();

    str = getParameter("minimum_x");
    double domainMinx = Double.valueOf(str).doubleValue();

    str = getParameter("maximum_y");
    double domainMaxy = Double.valueOf(str).doubleValue();

    str = getParameter("minimum_y");
    double domainMiny = Double.valueOf(str).doubleValue();   

    double c1=15.6, c2=1, c3=28, m0=-1.143, m1=-0.714;



    //----------------------------
    // Create the equation canvas
    //----------------------------
    equationCanvas = new ChuaCanvas();
    equationCanvas.setInitialState(0.0, initialx, initialy, initialz);
    equationCanvas.setDomain(domainMaxx,domainMinx,domainMaxy,domainMiny);
    equationCanvas.setTimeStep(stepSize);

    //-----------------------------
    // Create buttons if nessasary 
    //-----------------------------  
    if(buttonsOn) {

      //-------------------------
      // Parameter 1 = initial x
      //-------------------------
      Panel param1Panel = new Panel();
      param1Panel.setLayout(new BorderLayout());
      param1Panel.add("West", new Label("Initial x"));
      xText = new TextField(initialx+"", 8);
      param1Panel.add("East", xText);

      //-------------------------
      // Parameter 2 = initial y
      //-------------------------
      Panel param2Panel = new Panel();
      param2Panel.setLayout(new BorderLayout());
      param2Panel.add("West", new Label("Initial y"));
      yText = new TextField(initialy+"", 8);
      param2Panel.add("East", yText);

      Panel param3Panel = new Panel();
      param3Panel.setLayout(new BorderLayout());
      param3Panel.add("West", new Label("initial z"));
      zText = new TextField(initialz+"", 8);
      param3Panel.add("East", zText);

      Panel panelNo1 = new Panel();
      panelNo1.setLayout(new GridLayout(1, 3));
      panelNo1.add(param1Panel);
      panelNo1.add(param2Panel);
      panelNo1.add(param3Panel);

      Panel param21Panel = new Panel();
      param21Panel.setLayout(new BorderLayout());
      param21Panel.add("West", new Label("Min x"));
      tminx = new TextField(domainMinx+"", 8);
      param21Panel.add("East", tminx);

      Panel param22Panel = new Panel();
      param22Panel.setLayout(new BorderLayout());
      param22Panel.add("West", new Label("Max x"));
      tmaxx = new TextField(domainMaxx+"", 8);
      param22Panel.add("East", tmaxx);

      Panel param23Panel = new Panel();
      param23Panel.setLayout(new BorderLayout());
      param23Panel.add("West", new Label("Min y"));
      tminy = new TextField(domainMiny+"", 8);
      param23Panel.add("East", tminy);

      Panel param24Panel = new Panel();
      param24Panel.setLayout(new BorderLayout());
      param24Panel.add("West", new Label("Max x"));
      tmaxy = new TextField(domainMaxy+"", 8);
      param24Panel.add("East", tmaxy);

      Panel suurus=new Panel();
      suurus.setLayout(new GridLayout(1, 4));
      suurus.add(param21Panel);
      suurus.add(param22Panel);
      suurus.add(param23Panel);
      suurus.add(param24Panel);

      Panel param31Panel = new Panel();
      param31Panel.setLayout(new BorderLayout());
      param31Panel.add("Center", new Label("c1"));
      tc1 = new TextField(c1+"", 8);
      param31Panel.add("East", tc1);

      Panel param32Panel = new Panel();
      param32Panel.setLayout(new BorderLayout());
      param32Panel.add("Center", new Label("c2"));
      tc2 = new TextField(c2+"", 8);
      param32Panel.add("East", tc2);

      Panel param33Panel = new Panel();
      param33Panel.setLayout(new BorderLayout());
      param33Panel.add("Center", new Label("c3"));
      tc3 = new TextField(c3+"", 8);
      param33Panel.add("East", tc3);

      Panel param34Panel = new Panel();
      param34Panel.setLayout(new BorderLayout());
      param34Panel.add("Center", new Label("m0"));
      tm0 = new TextField(m0+"", 8);
      param34Panel.add("East", tm0);

      Panel param35Panel = new Panel();
      param35Panel.setLayout(new BorderLayout());
      param35Panel.add("Center", new Label("m1"));
      tm1 = new TextField(m1+"", 8);
      param35Panel.add("East", tm1);

      Panel suurus3=new Panel();
      suurus3.setLayout(new GridLayout(1, 5));
      suurus3.add(param31Panel);
      suurus3.add(param32Panel);
      suurus3.add(param33Panel);
      suurus3.add(param34Panel);
      suurus3.add(param35Panel);

      //-------------------------------------------
      // Control Bar Panel, entire user interface.
      //-------------------------------------------

      Panel controlBar = new Panel();
      controlBar.setLayout(new GridLayout(4, 1));
      stopStart = new Button("Restart with new settings");
      controlBar.add(stopStart);
      controlBar.add(panelNo1);
      controlBar.add(suurus);
      controlBar.add(suurus3);

      add("South", controlBar);


    } else {
      //-------------------------------------------------
      // If interface is off, just add a restart button.
      //-------------------------------------------------
      add("South", new Button("Restart"));
    }

    add("Center",equationCanvas);
    show();
  }


  //=====================================================================
  // start
  //
  // Start the thread.
  //=====================================================================
  public void start() {
    thread = new Thread(this);
    thread.start();
  }


  //=====================================================================
  // stop
  //
  // Stop the thread.
  //=====================================================================
  public void stop() {
    if(thread != null) {
      thread.stop();
      thread = null;
    }
  }

  //=====================================================================
  // run
  //
  // Run the thread, this is the main loop of the applet.
  //=====================================================================
  public void run() {
    equationCanvas.restart();
    while(true) {
      try {
        thread.sleep(25);
      }catch(InterruptedException e) {
        break;
      }
      equationCanvas.increment();
//      equationCanvas.repaint();
    }
  }
  
  //=====================================================================
  // handle action
  //
  // How to handle a button click.
  //=====================================================================
  public boolean action(Event evt, Object arg) {
  
    if(evt.target instanceof Button) {

      if(arg.equals("Restart with new settings")) {
        double initx = Double.valueOf(xText.getText()).doubleValue();
        double inity = Double.valueOf(yText.getText()).doubleValue();
        double initz = Double.valueOf(zText.getText()).doubleValue();
        double uminx = Double.valueOf(tminx.getText()).doubleValue();
        double umaxx = Double.valueOf(tmaxx.getText()).doubleValue();
        double uminy = Double.valueOf(tminy.getText()).doubleValue();
        double umaxy = Double.valueOf(tmaxy.getText()).doubleValue();
        double c1 = Double.valueOf(tc1.getText()).doubleValue();
        double c2 = Double.valueOf(tc2.getText()).doubleValue();
        double c3 = Double.valueOf(tc3.getText()).doubleValue();
        double m0 = Double.valueOf(tm0.getText()).doubleValue();
        double m1 = Double.valueOf(tm1.getText()).doubleValue();
        equationCanvas.setInitialState(0.0, initx, inity, initz);
        equationCanvas.setDomain(umaxx, uminx, umaxy, uminy);
        equationCanvas.setParams(c1, c2, c3, m0, m1);
        equationCanvas.restart();

      } else if(arg.equals("Restart")) {
        equationCanvas.restart();
      }
      return(true);
    }
    return(false);
  }
}