/*

 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). 

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "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: 

 *

 */

package com.nokia.carbide.cpp.pi.peccommon;

import java.util.Arrays;

import java.util.Vector;

import com.nokia.carbide.cpp.internal.pi.model.GenericSample;

import com.nokia.carbide.cpp.internal.pi.model.GenericSampledTrace;

/**

 * The model class for Performance Counter traces. This manages the data

 * for the IPC trace graphs, and is responsible for creating the graphs. 

 */

public class PecCommonTrace extends GenericSampledTrace {

	private static final long serialVersionUID = 4425739452429422333L;

	private int samplingInterval;

	/**

	 * hold the event types which have been traced

	 */

	private String[] valueTypes;

	// the following is needed for calculations for the legend (depend on

	// selected area). We keep it here since the selected area is the same for all graphs.

	// If this assumption ever changes, the calculations need to be moved into

	// the LegendContentProvider

	private double selectionStart;

	private double selectionEnd;

	private transient boolean needsRecalc;

	private transient PecCommonLegendElement[] legendElements;

	/**

	 * Constructor

	 */

	public PecCommonTrace() {

		super();

		selectionStart = -1;

		selectionEnd = -1;

		needsRecalc = true;

	}

	/**

	 * Set the event types present in the interconnect performance counter trace.

	 * @param valueTypes the event types to set

	 */

	public void setValueTypes(String[] valueTypes) {

		this.valueTypes = valueTypes;

	}

	/**

	 * Get the event types present in the interconnect performance counter trace.

	 * @return the event types present in the trace

	 */

	public String[] getValueTypes() {

		return valueTypes;

	}

	/**

	 * @return the sampling interval in milliseconds

	 */

	public int getSamplingInterval() {

		return samplingInterval;

	}

	/**

	 * Setter for the sampling interval in milliseconds

	 * @param samplingInterval the sampling interval to set

	 */

	public void setSamplingInterval(int samplingInterval) {

		this.samplingInterval = samplingInterval;

	}

	/**

	 * Callback for PIEvent.SELECTION_AREA_CHANGED

	 * @param newStart new selection start

	 * @param newEnd new selection end

	 */

	public void selectionAreaChanged(double newStart, double newEnd) {

		if (newStart != selectionStart || newEnd != selectionEnd){

			selectionStart = newStart;

			selectionEnd = newEnd;

			needsRecalc = true;

		}

	}    

    /**

	 * @return the legendElements

	 */

	public PecCommonLegendElement[] getLegendElements() {

		if (needsRecalc || legendElements == null){

			needsRecalc = false;

			calculateValues();

		}

		return legendElements;

	}

	/**

	 * calculates values for the legend depending on the selected time frame

	 */

	private void calculateValues() {

    	int c = this.valueTypes.length;

		int[] cnts = new int[c];

		long[] sums = new long[c];

		int[] mins = new int[c];

		int[] maxs = new int[c];

		if (selectionStart >= 0 && selectionEnd >= 0){

			Arrays.fill(mins, Integer.MAX_VALUE);

			Arrays.fill(maxs, Integer.MIN_VALUE);

			int start = (int) ((selectionStart + 0.5f));

			int end = (int) ((selectionEnd + 0.5f));

			Vector<GenericSample> selectedSamples = this.getSamplesInsideTimePeriod(start, end);

			for (GenericSample genericSample : selectedSamples) {

				PecCommonSample sample = (PecCommonSample)genericSample;

				//average, sum, min, max

				for (int i = 0; i < sample.values.length; i++) {

					int value = sample.values[i];

					cnts[i] ++;

					sums[i] += value;

					if (value < mins[i]){

						mins[i] = value;					

					} 

					if (value > maxs[i]){

						maxs[i] = value;					

					}

				}

			}

		}

		legendElements = createLegendElements(legendElements, this.valueTypes, cnts, sums, mins, maxs);

	}

	/**

	 * Creates or updates all legend elements

	 * @param existingElements Existing elements, if they need updating. If null, new elements are to be created.

	 * @param typeStrings Array of all trace event strings present in the trace 

	 * @param cnts Array of all count values (one per graph)

	 * @param sums Array of all sum values (one per graph)

	 * @param mins Array of all minimum values (one per graph)

	 * @param maxs Array of all maximum values (one per graph)

	 * @return Array of legend elements created or updated

	 */

	protected PecCommonLegendElement[] createLegendElements(PecCommonLegendElement[] existingElements, String[] typeStrings, int[] cnts,

			long[] sums, int[] mins, int[] maxs) {

    	int c = typeStrings.length;

    	boolean create = existingElements == null;    	

    	PecCommonLegendElement[] les = create ? new PecCommonLegendElement[c] : existingElements;

		char shortTitle = 'A';

		for (int i = 0; i < c; i++) {

			PecCommonLegendElement legendElement = create ? new PecCommonLegendElement(i, typeStrings[i], shortTitle, false) : existingElements[i];

			legendElement.setCnt(cnts[i]);

			legendElement.setSum(sums[i]);

			legendElement.setMax(maxs[i]);

			legendElement.setMin(mins[i]);

			les[i] = legendElement;

			shortTitle ++;

		}

		return les;

	}

}