/**
 * 
 */
package jalview.renderer;

import jalview.api.AlignViewportI;
import jalview.datamodel.AlignmentAnnotation;
import jalview.datamodel.Annotation;
import jalview.datamodel.ColumnSelection;
import jalview.datamodel.ContactListI;
import jalview.renderer.api.AnnotationRowRendererI;

import java.awt.Color;
import java.awt.Graphics;

/**
 * @author jprocter
 *
 */
public class ContactMapRenderer implements AnnotationRowRendererI
{

  @Override
  public void renderRow(Graphics g, int charWidth, int charHeight,
          boolean hasHiddenColumns, AlignViewportI viewport,
          ColumnSelection columnSelection, AlignmentAnnotation _aa,
          Annotation[] aa_annotations, int sRes, int eRes, float min,
          float max, int y)
  {
    if (sRes > aa_annotations.length)
    {
      return;
    }
    eRes = Math.min(eRes, aa_annotations.length);

    int x = 0, y2 = y;

    g.setColor(Color.pink);

    g.drawLine(x, y2, (eRes - sRes) * charWidth, y2);

    int column;
    int aaMax = aa_annotations.length - 1;
    while (x < eRes - sRes)
    {
      column = sRes + x;
      if (hasHiddenColumns)
      {
        column = columnSelection.adjustForHiddenColumns(column);
      }

      if (column > aaMax)
      {
        break;
      }

      if (aa_annotations[column] == null)
      {
        x++;
        continue;
      }
      /*
       * {profile type, #values, total count, char1, pct1, char2, pct2...}
       */
      ContactListI contacts = viewport.getContactList(_aa, column);

      if (contacts == null)
      {
        return;
      }

      // cell height to render
      double scale = (_aa.graphHeight < contacts.getContactHeight()) ? 1
              : (((double) _aa.graphHeight) / (double) contacts
                      .getContactHeight());
      // distance between contact map per cell
      int step = (int) ((contacts.getContactHeight()) * scale / _aa.graphHeight);

      // profl[1] is the number of values in the profile
      for (int stp = 0, ht = y2, eht = y2 - _aa.graphHeight; ht > eht; ht -= scale, stp++)
      {
        g.setColor(contacts
                .getColorForScore((int) (stp * step * ((double) _aa.graphHeight / (double) contacts
                        .getContactHeight()))));

        if (scale > 1)
        {
          g.fillRect(x * charWidth, ht, charWidth, 1 + (int) scale);
        }
        else
        {
          g.drawLine(x * charWidth, ht, (x + 1) * charWidth, ht);
        }
      }
      x++;
    }

  }
}