import com.blaxxun.x3d.*;
import com.blaxxun.bx3d.blaxxun3d;


/**
* hud
*
* implements a blaxxun3d hud
*
* @author marc kaufmann (mk), blaxxun interactive
* @version 0.1
*
**/

public class hud extends java.applet.Applet implements EventObserver {

    private Browser		              browser=null;
    
	private boolean					  initialized=false;
	
    private Node                      hud=null;
    private Field                     hudpos=null;
    private Field                     hudrot=null;
    
    private Node                      camred=null;
    private Node                      camgreen=null;
    private Node                      camblue=null;
    
    private Field                     bindred=null;
    private Field                     bindblue=null;
    private Field                     bindgreen=null;
    
    private Node                      tsred=null;
    private Node                      tsgreen=null;
    private Node                      tsblue=null;
    
    private Field                     clickred=null;
    private Field                     clickgreen=null;
    private Field                     clickblue=null;
    
	
	public void start()	{
		// connect to blaxxun3d
		while (browser==null) {
			browser=blaxxun3d.getBrowser("browser");
			hesitate();
		}
        System.out.println("Got browser.");
		
		// wait till everything is loaded
		while (browser.getWorld()==null) {
			hesitate();
		}
        System.out.println("World loaded.");

		browser.addAWTObserver(this);
		browser.addBrowserObserver(this);

		initialized=connectNodes();
		setHud();
		
	}

	/**
	* cleanup
	**/
	public void stop() {
        browser.removeAWTObserver(this);
        browser.removeBrowserObserver(this);
	    super.destroy();
	}


	/**
	* Handles awt events sent from the x3d browser
	*
	* @param e The java.awt.Event
	*
	**/
    public boolean onEvent(java.awt.Event event) {
        return false;
    }

	/**
	* Handles render events sent from the x3d browser
	*
	* @param type The type of the event
    * @param object The object that is associated with the event, Field or Node. object might be
    *               null for certain events, e.g. SHUTDOWN.
    * @param userdata The userdata that was specified when registering for the event.
	**/

	public boolean onEvent(int type, Object object, Object userData){
	    switch (type) {
	        			
	        case FIELD_CHANGED: {
				
	            if (((String)userData).equals("red")) {
	                bindred.setValueBool(true);
	            }
	            if (((String)userData).equals("blue")) {
	                bindblue.setValueBool(true);
                }	                
	            if (((String)userData).equals("green")) {
	                bindgreen.setValueBool(true);	               
	            }               
	        }
	        
			case START_RENDERING: {
			    if (initialized) setHud();
				break;
            }			
	    }
	            
	    return false;
    }

 
	/**
	* Establishes the connection to the nodes
	*
	* @return false if connection has not been established, else true
	**/

    private boolean connectNodes() {
        try {
            hud=browser.getNode("hud");
            hudpos=hud.getField("translation");
            hudrot=hud.getField("rotation");
            
            // get touch sensor active flags
            tsred=browser.getNode("t1");
            tsgreen=browser.getNode("t2");
            tsblue=browser.getNode("t3");
            clickred=tsred.getField("touchTime");
            clickgreen=tsgreen.getField("touchTime");
            clickblue=tsblue.getField("touchTime");
            
            //register observer
            clickred.addObserver(this,"red");
            clickgreen.addObserver(this,"green");
            clickblue.addObserver(this,"blue");
            
            // get camera set bind events            
            camred=browser.getNode("camred");
            bindred=camred.getField("set_bind");
            camblue=browser.getNode("camblue");
            bindblue=camblue.getField("set_bind");
            camgreen=browser.getNode("camgreen");
            bindgreen=camgreen.getField("set_bind");
            
        }
        catch (Exception e) {
            System.out.println(e+": Problems getting nodes!");
			stop();
        }
        System.out.println("Got nodes.");
		return true;
        
    }
    
   	/**
	* Update the hud's coordinates
	*	
	**/
	
	private void setHud() {
	    
	    Node vp=null;
	    float [] pos=new float[3];
	    float [] rot=new float[4];
	    
	    // get current cam coords
	    vp=(Node)browser.getProperty(browser.PROPERTY_BOUNDVIEWPOINT);
	    pos=(vp.getField("position")).getValueFloatArray(0,-1);
	    rot=(vp.getField("orientation")).getValueFloatArray(0,-1);
	    
		// sync with renderer
		browser.beginUpdate();
		
	    // update hud's coords
	    hudpos.setValueFloatArray(0,-1,pos);
	    hudrot.setValueFloatArray(0,-1,rot);
		
		// sync
		browser.endUpdate();
    }

	/**
	 * waits 300 millis
	 */
	private void hesitate() {
		try {
			Thread.sleep(300);
		}
		catch(InterruptedException ignored) {}
	}
}