/**

  * Copyright 2009 Martin Vysny.

  *

  * This file is part of WebVM.

  *

  * WebVM 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 3 of the License, or

  * (at your option) any later version.

  *

  * WebVM 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 WebVM.  If not, see <http://www.gnu.org/licenses/>.

  */

 package sk.baka.webvm;

 import java.io.File;

 import java.lang.management.MemoryUsage;

 import java.net.URL;

 import java.util.List;

 import org.apache.wicket.markup.html.WebPage;

 import org.apache.wicket.markup.html.basic.Label;

 import sk.baka.tools.UrlUtils;

 import sk.baka.webvm.analyzer.HistorySample;

 import sk.baka.webvm.analyzer.HistorySampler;

 import sk.baka.webvm.misc.BluffGraph;

 import sk.baka.webvm.misc.DivGraph;

 import sk.baka.webvm.misc.GraphStyle;

 /**

  * A superclass of all webvm pages.

  * @author Martin Vysny

  */

 public class WebVMPage extends WebPage {

     private static final long serialVersionUID = 1L;

     /**

      * Each page is wrapped in this border.

      */

     protected final AppBorder border;

     /**

      * Creates new webvm page.

      */

     public WebVMPage() {

         super();

         border = new AppBorder("appBorder");

         add(border);

     }

     /**

      * Draws details for given memory usage object line.

      * @param history the history to draw

      * @param wid chain result with this wicket id

      * @param index the memory usage index to the {@link HistorySample#memUsage} array.

      */

     public final void drawMemoryUsageGraph(final List<HistorySample> history, final String wid, final int index) {

         if (history.size() == 0) {

             border.add(new Label(wid, ""));

             return;

         }

         final GraphStyle gs = Graphs.newDefaultStyle();

         gs.colors = new String[]{Graphs.COLOR_BLUE, Graphs.COLOR_BROWN};

         long maxMem = history.get(0).memPoolUsage[index].getMax();

         if (maxMem == -1) {

             maxMem = 0;

             for (final HistorySample hs : history) {

                 final MemoryUsage usage = hs.memPoolUsage[index];

                 if (maxMem < usage.getCommitted()) {

                     maxMem = usage.getCommitted();

                 }

             }

             maxMem = maxMem * 5 / 4;

         }

         final BluffGraph dg = new BluffGraph((int) maxMem, gs);

         for (final HistorySample hs : history) {

             final MemoryUsage usage = hs.memPoolUsage[index];

             dg.add(new int[]{(int) usage.getUsed(), (int) usage.getCommitted()});

         }

         dg.fillWithZero(HistorySampler.HISTORY_VMSTAT.getHistoryLength(), false);

         unescaped(wid, dg.draw());

     }

     /**

      * Shows given string unescaped.

      * @param wid the wicket component

      * @param value the value to show

      */

     public final void unescaped(final String wid, final String value) {

         final Label l = new Label(wid, value);

         l.setEscapeModelStrings(false);

         border.add(l);

     }

     /**

      * Draws a memory usage status for given memory usage object

      * @param usage the memory usage object, must be in megabytes as int arithmetics is used.

      * @param wid the wicket component

      * @param width the width of the bar in pixels.

      */

     public final void drawMemoryStatus(final MemoryUsage usage, final String wid, final int width) {

         final String bar = DivGraph.drawMemoryStatus(usage, width);

         unescaped(wid, bar);

     }

     public static File toFile(final URL url) {

         final String file = UrlUtils.toLocalFile(url.toString());

         return file == null ? null : new File(file);

     }

 }