/*
 * Created on Apr 30, 2004
 * Created by Olivier Chalouhi
 * Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 * 
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */
package org.gudy.azureus2.ui.swt.mainwindow;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;


import org.gudy.azureus2.core3.util.AERunnable;
import org.gudy.azureus2.ui.swt.ImageRepository;
import org.gudy.azureus2.ui.swt.Utils;

import com.aelitis.azureus.ui.IUIIntializer;
import com.aelitis.azureus.ui.InitializerListener;
import com.aelitis.azureus.ui.swt.utils.ColorCache;

/**
 * The initial Splash Screen shown while azureus loads 
 */
public class SplashWindow implements InitializerListener {
  
  Display display;
  IUIIntializer initializer;
  
  Shell splash;
  Label currentTask;
  ProgressBar percentDone;
	private String task;
	private int percent;
	private boolean updating;
  

  public SplashWindow(Display display) {
  	this(display, null);
  }

  public SplashWindow(Display display,IUIIntializer initializer) {
    this.display = display;
    this.initializer = initializer;
    
    splash = new Shell(display, SWT.NULL);
    splash.setText("Azureus");
    Utils.setShellIcon(splash);

    GridLayout layout = new GridLayout();
    layout.numColumns = 1;
    layout.horizontalSpacing = 0;
    layout.verticalSpacing = 0;
    layout.marginHeight = 0;
    layout.marginWidth = 0;
    splash.setLayout(layout);
    Label label = new Label(splash, SWT.NONE);
    label.setImage(ImageRepository.getImage("azureus_splash"));

    currentTask = new Label(splash,SWT.BORDER);
    GridData gridData = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL);
    currentTask.setLayoutData(gridData);
    currentTask.setBackground(ColorCache.getColor(display, 255, 255, 255));
    currentTask.setText("(: Azureus :)");
    
    this.percentDone = new ProgressBar(splash,SWT.HORIZONTAL);
    this.percentDone.setMinimum(0);
    this.percentDone.setMaximum(100);
    gridData = new GridData(GridData.FILL_HORIZONTAL);
    this.percentDone.setLayoutData(gridData);

    splash.pack();
    splash.layout();
    Utils.centreWindow(splash);
    splash.open();
    
    if (initializer != null) {
    	initializer.addListener(this);
    }
  }
  
  
  public static void create(final Display display,final Initializer initializer) {
  	Utils.execSWTThread(new AERunnable() {
			public void runSupport() {
				if (display == null || display.isDisposed())
					return;

				new SplashWindow(display, initializer);
			}
		});
  }
  
  
  /*
   * Should be called by the GUI thread
   */
  public void closeSplash() {
    Utils.execSWTThread(new AERunnable(){
      public void runSupport() {
				try {
					if (initializer != null)
						initializer.removeListener(SplashWindow.this);
					if (splash != null && !splash.isDisposed())
						splash.dispose();
					ImageRepository.unloadImage("azureus_splash");
				} catch (Exception e) {
					//ignore
				}
			}
    });
  }
  
  
  /*
   * STProgressListener implementation
   */
  
  // AzureusCoreListener
  public void reportCurrentTask(final String task) {
    //Ensure that display is set and not disposed
    if(display == null || display.isDisposed())
      return;

    if (this.task == null || this.task.compareTo(task) != 0) {
    	this.task = task;
    	update();
    }
  }
  
  /**
	 * 
	 *
	 * @since 3.0.0.7
	 */
	private void update() {
		if (updating) {
			return;
		}
		
		updating = true;
    //Post runnable to SWTThread
    Utils.execSWTThread(new AERunnable(){
      public void runSupport() {
      	updating = false;
        //Ensure than the task Label is created and not disposed
        if(currentTask != null && !currentTask.isDisposed() && task != null) {
        	currentTask.setText(task);
        }
        //Ensure than the percentDone ProgressBar is created and not disposed
        if(percentDone != null && !percentDone.isDisposed()) {
        	percentDone.setSelection(percent);
        }
      }
    });
	}
	
	public int getPercent() {
		return percent;
	}

	// AzureusCoreListener
  public void reportPercent(final int percent) {
    //Ensure that display is set and not disposed
    if(display == null || display.isDisposed())
      return;
    
    //OK Tricky way to close the splash window BUT ... sending a percent > 100 means closing
    if (percent > 100) {
      closeSplash();
      return;
    }
    
    if (this.percent != percent) {
    	this.percent = percent;
    	update();
    }
  }
 
}