/* AlgThread.java */

/* Generic algorithm running thread ..
	all algorithms implement specialisations of this ..
	overriding methods as they need

*/

package ciips.animation;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;

/**
  Animations should extend this class and implement the
  run and loadData methods.

 */
public abstract class AlgThread extends Thread implements ItemListener,
																			InputCompleteListener {
  static int max_data = 10;
  // private String[] dataSets = { "Graph 1", "Graph 2", "Graph 3"};
  static String base_data_file_name = "graph.rb";
    
  public AlgAnimFrame frame;	// Parent frame
  public DrawingPanel[] d_panel;
  static final int offset_y = 10;
  static final int offset_x = 50;
  private int frames = 1;	// Number of consecutive frames to be shown

	private static final boolean DEBUG = true;
	
  public AlgThread() {
		System.out.println("AlgThread cons complete");
    }
    
  public void setParms( AlgAnimFrame frame, int frames ) {
		if(frame == null) { System.out.println("AlgThread: null frame"); }
		System.out.println("AlgThread - " + frames + " frames" );
		this.frame = frame;
		this.frames = frames;
		d_panel = new DrawingPanel[frames];
		if( DEBUG ) System.out.println("AlgThread:setParms complete");
    }

  public void setParms( AlgAnimFrame frame, String ds[], int frames ) {
		setParms( frame, frames );
		// dataSets = ds;
    }

	public void setParms( AlgAnimFrame frame, String df_prefix, int frames ) {
		this.setParms( frame, frames );
		// Now locate all the data files
		// dataSets = getFileNames( df_prefix );
		}
    
	// public String[] getDataSets() { return dataSets; }
    
	// Added in a setDelay function here
	public void setDelay(int delay) {
		frame.getCurrentPanel().setDelay(delay);
    }
    
	public int getDataPanelCount() { return frames; }
   
    /** Shuffle the previous panels down
     *  Panel with index = 0 is the current panel
     */
	public void shuffleDown( ) {
		if ( frames == 1 ) return;	// nothing to do
		for( int k=1;k<frames;k++) {
	    // Move image[k-1] to image[k]
	    Image prevImage = d_panel[k].getImage();
	    if ( prevImage == null){ 
				System.out.println ("ShuffleDown- Previous image null");
				return;
				}
	    Graphics g = d_panel[k-1].getGraphics();
	    if (g == null){
				System.out.println ("ShuffleDown- Graphics is  null");
				return;
				}
	    g.drawImage( prevImage, 0, 0, null );
	    d_panel[k].setImage( prevImage );
			}
		}

    
	/** Load or generate a specified data set.
		The animation writer should implement this in the specialization
		class. <TT>choice</TT> will be a data set index in the range 0..max_data_sets-1
    */
	public abstract boolean loadData( int choice );

    
	/** Generate the example data set.
		Reads the chosen data set from the frame's menu,
		and calls <TT>loadData( choice )</TT> to load or generate the
		appropriate data set.
	*/
	public void generateData() {
		//int choice = frame.control_panel.getDataChoice();
		//added
		// this.dpAfter = frame.getDrawingPanel();
		frame.getCurrentPanel().init();
		int choice = frame.getDataChoice();
		if ( loadData( choice ) ) {
	    System.out.println("Data loaded OK");
			}
		else {
			System.out.println("Data loading error");
			}
		}
       
  /** Run the animation.
		This is the key method that the animator provides: it
		starts up the animation and runs it to completion.
	*/
	public abstract void run(); 

	public void restoreDrawingPanel() {
		// This needs to be here because it gets called from AlgAnimFrame
		}
    
	//This method needs to be here for the skip button to be effective
	public void waitSkip() {
		DrawingPanel dpAfter = frame.getCurrentPanel();
		if(!dpAfter.getSkip()) return;
		((ImageButton)frame.getSkipItem()).setEnable();
		((ImageButton)frame.getRunItem()).setEnable();
		((ImageButton)frame.getStopItem()).setDisable();
		dpAfter.setSkip(false);
		frame.setStep(true);
		frame.waitStep();
    }

	/** Find the list of file names with a given prefix and numeric extensions
	**/
/**
	public String[] getFileNames( String prefix ) {
		File f;
		String n[] = null;
		String names[] = new String[100];	// Arbitrary maximum
		int cnt = 0;
		URL base_name = frame.getApplet().getCodeBase();
		for( cnt=0;cnt<99;cnt++ ) {
			String fn = prefix + cnt;
			try {
				URL dataURL = new URL( base_name, fn );
				URLConnection c = dataURL.openConnection();
				long x = c.getDate();
				System.out.println("AlgThread:getFN - " + cnt + ": " + fn + " date " + x );
				Object o = c.getContent();
				if ( o == null ) break;
				// Assume that it we get here, we had a valid connection
				names[cnt] = fn;
				} 
			catch (IOException e) {
				break;
				} 
			}
		if ( cnt <= 0 ) {
			System.out.println("AlgThread:getFileNames - none found");
			}
		else {
			System.out.println("AlgThread:getFileNames - " + cnt + " found");
			n = new String[cnt];
			for( int j=0;j<cnt;j++ ) { n[j] = names[j]; }
			}
		return n;
		}
**/

	/** Return a list of options that can be set when running the algorithm:
			override this method in the sub-class if there are any such options.
			This method returns null.
	**/
	public String[] getOptions() { return null; }

	/** Options are added to the Options menu: when their state changes,
			the algorithm thread will be notified.
			Override this method to handle changes in the options.
	**/
	public void itemStateChanged( ItemEvent e ) { }

	/** Options are added to the Options menu: when their state changes,
			the algorithm thread will be notified.
			Override this method to handle changes in the options.
	**/
	public void optionChanged( int index, boolean new_state ) {
		if( DEBUG ) System.out.println("AlgThread: option " + index + " becomes " +
																new_state );
		}

	/** Allow the animator to create a special menu of user actions
			associated with this animation.
			To create a special actions menu, override this method in the algorithm
			thread.  If this method returns a non-null menu, it will be added to
			the animation frame
	**/
	public Menu getActionMenu() { return null; }

	public void inputComplete( InputDialogEvent e ) {}
}