/*

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:  Definitions for the class YAxis

 *

 */

package com.nokia.s60tools.analyzetool.internal.ui.graph;

import java.text.DecimalFormat;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Status;

import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.GC;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Transform;

import org.eclipse.swt.widgets.Canvas;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.progress.UIJob;

import com.nokia.s60tools.analyzetool.engine.IMemoryActivityModel;

import com.nokia.s60tools.analyzetool.engine.IMemoryActivityModelChangeListener;

import com.nokia.s60tools.analyzetool.engine.statistic.ProcessInfo;

import com.nokia.s60tools.analyzetool.internal.ui.util.GraphUtils;

/**

 * FigureCanvas containing the Y axis of the AnalyzeTool graph

 *

 */

public class YAxis extends Canvas implements IMemoryActivityModelChangeListener {

	private static final int YLEGENDSPACE = 60;

	private static final DecimalFormat MB_FORMAT = new DecimalFormat("#####.0");

	private IMemoryActivityModel model;

	protected int visualSizeY = 0;

	private UIJob iRefreshUIJob;

	private Image bytesImage;

	/**

	 * Constructor

	 * @param parent

	 */

	public YAxis(Composite parent) {

		super(parent, SWT.NONE);

	}

	/**

	 * To be called once after construction.

	 */

	public void createContent() {

		iRefreshUIJob = new UIJob("Updating Memory Activity Graph"){

			@Override

			public IStatus runInUIThread(IProgressMonitor arg0) {

				// Refresh the graph

				redraw();

				return Status.OK_STATUS;

			}

		};

		iRefreshUIJob.setSystem(true);		

	}

	/**

	 * Sets a new model as input

	 */

		if (this.model != null){

			this.model.removeListener(this);

		}

		this.model.addListener(this);

	}

	/**

	 * Called when paint event occurs. 

	 * @param gc The GC to draw on

	 */

	@SuppressWarnings("cast")

	public void paintYAxis(GC gc){

		double visY = visualSizeY - 50;

		//max value influences unit of measure on graph

		int prettyBytes = GraphUtils.prettyMaxBytes(model.getHighestCumulatedMemoryAlloc());

		double multiplier = prettyBytes / visY;

		double yIncrement = visY / 10;

		int previousBottom = 0;

		for (double k = visY; k >= 0; k-=yIncrement)

		{

			// location for the value indicator is k * 1/10 the height of the display

			int y = (int) (visY - k);

			int bytes = (int)(Math.ceil(k * multiplier));

			String legend = "";

			if (prettyBytes < 10*1024)

			{

				legend += bytes + " B"; 

			}

			else if (prettyBytes <= 500 * 1024)

			{

				legend += (bytes / 1024) + " KB"; 

			}

			else

			{

				legend +=  MB_FORMAT.format(((float) bytes / (1024 * 1024)))  + " MB";

			}

			org.eclipse.swt.graphics.Point extent = gc.stringExtent(legend);

			if (y >= previousBottom)

			{

			}

		}

		if (bytesImage == null){

			bytesImage = GraphUtils.getVerticalLabel("Bytes");			

		}

		gc.setAdvanced(true);

	    final org.eclipse.swt.graphics.Rectangle rect2 = bytesImage.getBounds();

        Transform transform = new Transform(Display.getDefault());

        transform.translate(rect2.height / 2f, rect2.width / 2f);

        transform.rotate(-90);

        transform.translate(-rect2.width / 2f, -rect2.height / 2f);

        gc.setTransform(transform);

        gc.drawImage(bytesImage, -(int)visY/3, 1);

        transform.dispose();

	}

	/**

	 * @return the visible height of the control

	 */

	public int getHeight() {

		return visualSizeY;

	}

	/**

	 * Sets the visible height of the control

	 * @param height the height to set

	 */

	public void setHeight(int height) {

		visualSizeY = height;

	}

	/* (non-Javadoc)

	 * @see com.nokia.s60tools.analyzetool.engine.IMemoryActivityModelChangeListener#onProcessesAdded()

	 */

	public void onProcessesAdded() {

		iRefreshUIJob.cancel();

		iRefreshUIJob.schedule();

	}

	/* (non-Javadoc)

	 * @see com.nokia.s60tools.analyzetool.engine.IMemoryActivityModelChangeListener#onProcessSelected(com.nokia.s60tools.analyzetool.engine.statistic.ProcessInfo)

	 */

	public void onProcessSelected(ProcessInfo p) {

		iRefreshUIJob.cancel();

		iRefreshUIJob.schedule();

	}

//	public void dispose() {

//	//TODO cancel ui jobs here and remove listeners

//	//there is no dispose() entry point in this class; we may have to call this via MainView.dispose()

//}

}