package jalview.gui;

import java.awt.*;
import java.awt.Graphics2D.*;
import java.awt.image.*;
import javax.swing.*;
import jalview.datamodel.*;
import jalview.analysis.*;
public class IdCanvas extends JPanel
{
  protected AlignViewport av;

  protected boolean showScores  = true;

  protected int     maxIdLength = -1;
  protected String  maxIdStr    = null;
  BufferedImage image;
  Graphics2D gg;
  int imgHeight=0;
  boolean fastPaint = false;

  public IdCanvas(AlignViewport av)
  {
    setLayout(new BorderLayout());
    this.av         = av;
    PaintRefresher.Register(this);
  }

  public void drawIdString(Graphics2D gg,SequenceI s,int i, int starty, int ypos) {
      int charHeight = av.getCharHeight();


      if (av.getSelectionGroup()!=null && av.getSelectionGroup().sequences.contains(s)) {
	  gg.setColor(Color.lightGray);
	  gg.fillRect(0,AlignmentUtil.getPixelHeight(starty,i,charHeight)+ ypos,getWidth(),charHeight);
	  gg.setColor(Color.white);
      } else {
	  gg.setColor(s.getColor());
	  gg.fillRect(0,AlignmentUtil.getPixelHeight(starty,i,charHeight)+ ypos,getWidth(),charHeight);
	  gg.setColor(Color.black);
      }

      String string = s.getName();
      if(av.getShowFullId())
        string = s.getDisplayId();

      gg.drawString(string,0,AlignmentUtil.getPixelHeight(starty,i,charHeight) + ypos + charHeight-   (charHeight/5));

  }

  public void fastPaint(int vertical)
  {
    if(gg==null)
    {  repaint(); return;}

    gg.copyArea( 0,0, getWidth(), imgHeight, 0, -vertical*av.charHeight );

    int ss=av.startSeq, es=av.endSeq, transY = 0;
    if (vertical > 0) // scroll down
     {
       ss = es - vertical;
       if(ss<av.startSeq) // ie scrolling too fast, more than a page at a time
         ss = av.startSeq;
       else
         transY = imgHeight - vertical * av.charHeight;
     }
     else if (vertical < 0)
     {
       es = ss - vertical;
       if(es > av.endSeq)
         es = av.endSeq;
     }



        gg.translate(0, transY);

        drawIds(ss, es);

        gg.translate( 0, -transY );


      fastPaint = true;
      repaint();
  }

  public void paintComponent(Graphics g)
  {
    g.setColor(Color.white);
    g.fillRect(0, 0, getWidth(), getHeight());

    if (fastPaint)
    {
      fastPaint = false;
      g.drawImage(image, 0, 0, this);
      return;
    }

    imgHeight = getHeight();
    imgHeight -= imgHeight % av.charHeight;
    image = new BufferedImage(getWidth(), imgHeight, BufferedImage.TYPE_INT_RGB);
    gg = (Graphics2D) image.getGraphics();
    //Fill in the background
    gg.setColor(Color.white);
    gg.fillRect(0, 0, getWidth(), imgHeight);
    gg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    Font italic = new Font(av.getFont().getName(), Font.ITALIC,
                           av.getFont().getSize());
    gg.setFont(italic);

    drawIds( av.getStartSeq(), av.endSeq);

    g.drawImage(image, 0, 0, this);
  }

  void drawIds(int starty, int endy)
  {
    Color currentColor     = Color.white;
    Color currentTextColor = Color.black;

    if (av.getWrapAlignment())
    {

          int rowSize =  av.getEndRes() - av.getStartRes();
          // Draw the rest of the panels

          for(int ypos=2*av.charHeight, row=av.getEndRes()-rowSize;
              ypos <= getHeight() && row<av.alignment.getWidth();
              ypos += av.chunkHeight, row+=rowSize )
          {
            for (int i = starty; i < av.alignment.getHeight(); i++)
            {
              SequenceI s = av.alignment.getSequenceAt(i);
              drawIdString(gg, s, i, 0, ypos);
            }
          }


    } else
    {

      //Now draw the id strings
      for (int i = starty; i < endy; i++)
      {
        // Selected sequence colours

        if (av.getSelectionGroup()!= null
            && av.getSelectionGroup().sequences.contains(av.alignment.getSequenceAt(i)))
        {
       //   if(av.alignment.findGroup(al.getSequenceAt(i)).getEndRes()==
          currentColor = Color.lightGray;
          currentTextColor = Color.black;
        }
        else
        {
          currentColor = av.alignment.getSequenceAt(i).getColor();
          currentTextColor = Color.black;
        }

        gg.setColor(currentColor);

        gg.fillRect(0,
                    AlignmentUtil.getPixelHeight(starty, i, av.charHeight),
                    getWidth(),
                    av.charHeight);

        gg.setColor(currentTextColor);
        String string = av.alignment.getSequenceAt(i).getName();
        if(av.getShowFullId())
          string = av.alignment.getSequenceAt(i).getDisplayId();
        gg.drawString(string, 0,
                      AlignmentUtil.getPixelHeight(starty, i, av.charHeight) +
                      av.charHeight - (av.charHeight / 5));
      }

      // add a border
      gg.setColor(Color.white);
      gg.fillRect(getWidth()-4,0,4,getHeight());
    }

  }
}