/*
 * 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 java.awt.event.*;

import jalview.datamodel.*;

public class ScalePanel
    extends Panel
{

  protected int offy = 4;
  public int width;

  protected AlignViewport av;
  AlignmentPanel ap;

  boolean stretchingGroup = false;

  public ScalePanel(AlignViewport av, AlignmentPanel ap)
  {
    setLayout(null);
    this.av = av;
    this.ap = ap;

    addMouseListener(new MouseAdapter()
    {
      public void mousePressed(MouseEvent evt)
      {
        doMousePressed(evt);
      }

      public void mouseReleased(MouseEvent evt)
      {
        doMouseReleased(evt);
      }

    });
    addMouseMotionListener(new MouseMotionAdapter()
    {
      public void mouseDragged(MouseEvent evt)
      {
        doMouseDragged(evt);
      }
    });

  }

  public void doMousePressed(MouseEvent evt)
  {
    int x = evt.getX();
    int res = x / av.getCharWidth() + av.getStartRes();
    SequenceGroup sg = null;

    if (av.getColumnSelection().contains(res))
    {
      av.getColumnSelection().removeElement(res);
    }
    else
    {
      av.getColumnSelection().addElement(res);

      sg = new SequenceGroup();
      for (int i = 0; i < av.alignment.getSequences().size(); i++)
      {
        sg.addSequence(av.alignment.getSequenceAt(i), false);
      }

      sg.setStartRes(res);
      sg.setEndRes(res);

      ap.annotationPanel.addEditableColumn(res);
    }
    av.setSelectionGroup(sg);
    ap.repaint();
  }

  public void doMouseReleased(MouseEvent evt)
  {
    if (!stretchingGroup)
    {
      return;
    }

    int x = evt.getX();
    int res = x / av.getCharWidth() + av.getStartRes();

    if(res> av.alignment.getWidth())
    {
      res = av.alignment.getWidth()-1;
    }

    if (!av.getColumnSelection().contains(res))
    {
      av.getColumnSelection().addElement(res);
    }

    SequenceGroup sg = av.getSelectionGroup();

    if (res > sg.getStartRes())
    {
      sg.setEndRes(res);
    }
    else if (res < sg.getStartRes())
    {
      sg.setStartRes(res);
    }

    stretchingGroup = false;
    ap.repaint();
  }

  public void doMouseDragged(MouseEvent evt)
  {
    int x = evt.getX();
    int res = x / av.getCharWidth() + av.getStartRes();

    if(res> av.alignment.getWidth())
    {
      res = av.alignment.getWidth()-1;
    }

    SequenceGroup sg = av.getSelectionGroup();
    if (sg != null)
    {
      stretchingGroup = true;
      if (res > sg.getStartRes())
      {
        sg.setEndRes(res);
      }
      else if (res < sg.getStartRes())
      {
        sg.setStartRes(res);
      }

      ap.annotationPanel.addEditableColumn(res);
      ap.repaint();
    }
  }

  public void update(Graphics g)
  {
    paint(g);
  }

  public void paint(Graphics g)
  {
    drawScale(g, av.getStartRes(), av.getEndRes(), getSize().width,
              getSize().height);
  }

// scalewidth will normally be screenwidth,
  public void drawScale(Graphics gg, int startx, int endx, int width,
                        int height)
  {
    gg.setFont(av.getFont());

    //Fill in the background
    gg.setColor(Color.white);
    gg.fillRect(0, 0, width, height);
    gg.setColor(Color.black);

    //Fill the selected columns
    ColumnSelection cs = av.getColumnSelection();
    gg.setColor(new Color(220, 0, 0));
    for (int i = 0; i < cs.size(); i++)
    {
      int sel = cs.columnAt(i);
      if (sel >= startx && sel <= endx)
      {
        gg.fillRect( (sel - startx) * av.charWidth, 0, av.charWidth,
                    getSize().height);
      }
    }

    // Draw the scale numbers
    gg.setColor(Color.black);
    int scalestartx = (startx / 10) * 10;

    FontMetrics fm = gg.getFontMetrics(av.getFont());
    int y = av.charHeight - fm.getDescent();

    if (scalestartx % 10 == 0)
    {
      scalestartx += 5;
    }

    String string;
    int maxX=0;

    for (int i = scalestartx; i < endx; i += 5)
    {
      if (i % 10 == 0)
      {
        string = String.valueOf(i);
        if ( (i - startx - 1) * av.charWidth > maxX)
        {
          gg.drawString(string,
                        (i - startx - 1) * av.charWidth, y);
          maxX = (i - startx + 1) * av.charWidth + fm.stringWidth(string);
        }

        gg.drawLine( (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                    y + 2,
                    (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                    y + fm.getDescent() * 2);
      }
      else
      {
        gg.drawLine( (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                    y + fm.getDescent(),
                    (int) ( (i - startx - 1) * av.charWidth + av.charWidth / 2),
                    y + fm.getDescent() * 2);
      }

    }
  }

}