/**

  * 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.misc;

 /**

  * Renders a graph using the Bluff javascript rendering engine.

  * @author Martin Vysny

  */

 public final class BluffGraph extends AbstractGraph {

     /**

      * Creates new graph.

      * @param max the maximum value, ignored.

      * @param style the style.

      */

     public BluffGraph(int max, GraphStyle style) {

         super(max, style);

     }

     @Override

     public void draw(StringBuilder sb) {

         final String id = Integer.toString(System.identityHashCode(this));

         sb.append("<canvas id=\"");

         sb.append(id);

         sb.append("\"");

         if (style.border != null) {

             sb.append(" style=\"border: 1px solid ");

             sb.append(style.border);

             sb.append("; \"");

         }

         sb.append("></canvas><script type=\"text/javascript\">\n");

         drawBluffInitializationScript(sb, id);

         for (int i = 0; i < style.colors.length; i++) {

             drawBluffDataAxis(sb, i);

         }

         sb.append("  g.minimum_value=0;g.maximum_value=");

         sb.append(max);

         sb.append(";\n");

         sb.append("  g.draw();\n");

         sb.append("</script>\n");

     }

     private void drawBluffDataAxis(StringBuilder sb, int i) {

         sb.append("  g.data(\"\", [");

         boolean first = true;

         // hack to suppress the "No Data" message - displayed when a bunch of zeroes is fed to the graph.

         // Just add a single "1" to the end of the graph :)

         boolean zeroesOnly = true;

         for (final int[] vals : this.values) {

             if (first) {

                 first = false;

             } else {

                 sb.append(",");

             }

             int val = vals[i];

             if (style.style == GraphStyle.GraphStyleEnum.StackedBar) {

                 // elements are stacked on top of each other, not behind themselves. Recompute items values to fix this.

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

                     val -= vals[j];

                 }

             }

             if (val != 0) {

                 zeroesOnly = false;

             }

             sb.append(val);

         }

         if (zeroesOnly) {

             sb.append('1');

         }

         sb.append("], '");

         sb.append(style.colors[i]);

         sb.append("');\n");

     }

     private void drawBluffInitializationScript(StringBuilder sb, final String id) {

         sb.append("  var g = new Bluff.");

         switch (style.style) {

             case StackedBar:

                 sb.append("StackedArea");

                 break;

             case Line:

                 sb.append("Line");

                 break;

         }

         sb.append("('");

         sb.append(id);

         sb.append("', '");

         sb.append(style.width);

         sb.append('x');

         sb.append(style.height);

         sb.append("');\n");

         if (style.caption == null) {

             sb.append("  g.hide_title = true;\n");

         } else {

             sb.append("  g.title='");

             sb.append(style.caption);

             sb.append("';\n");

         }

         if (!style.yLegend) {

             sb.append("g.hide_line_numbers = true;");

         }

         sb.append("g.hide_legend = true;g.set_margins(0);g.sort = false;g.theme_37signals();\n");

     }

 }