/*
 * Jalview - A Sequence Alignment Editor and Viewer
 * Copyright (C) 2005 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

package jalview.appletgui;

import java.awt.*;

import jalview.analysis.*;
import jalview.datamodel.*;

public class IdCanvas
    extends Panel
{
  protected AlignViewport av;

  protected boolean showScores = true;

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

  java.util.Vector searchResults;

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

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

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

  public void paint(Graphics g)
  {
    if (getSize().height < 0 || getSize().width < 0)
    {
      return;
    }
    if (fastPaint)
    {
      fastPaint = false;
      g.drawImage(image, 0, 0, this);
      return;
    }

    imgHeight = getSize().height;
    imgHeight -= imgHeight % av.charHeight;

    if (imgHeight < 1)
    {
      return;
    }

    if (image == null || imgHeight != image.getHeight(this))
    {
      image = createImage(getSize().width, imgHeight);
      gg = image.getGraphics();
      gg.setFont(av.getFont());
    }

    //Fill in the background
    gg.setColor(Color.white);
    Font italic = new Font(av.getFont().getName(), Font.ITALIC,
                           av.getFont().getSize());
    gg.setFont(italic);

    gg.fillRect(0, 0, getSize().width, getSize().height);
    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.startRes;
           ypos <= getSize().height && 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 (searchResults != null &&
            searchResults.contains(av.alignment.getSequenceAt(i)))
        {
          gg.setColor(Color.black);
          currentColor = Color.black;
          currentTextColor = Color.white;
        }
        else if (av.getSelectionGroup() != null
                 &&
                 av.getSelectionGroup().sequences.contains(av.alignment.
            getSequenceAt(i)))
        {
          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),
                    getSize().width,
                    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(getSize().width - 4, 0, 4, getSize().height);
    }

  }

  public void setHighlighted(java.util.Vector found)
  {
    searchResults = found;
    repaint();
  }
}