/*
 * 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.util.*;

import java.awt.*;
import java.awt.event.*;

import jalview.datamodel.*;
import jalview.math.*;
import jalview.util.*;

public class RotatableCanvas
    extends Panel implements MouseListener,
    MouseMotionListener,
    KeyListener
{
  RotatableMatrix idmat = new RotatableMatrix(3, 3);
  RotatableMatrix objmat = new RotatableMatrix(3, 3);
  RotatableMatrix rotmat = new RotatableMatrix(3, 3);

  //RubberbandRectangle rubberband;

  boolean drawAxes = true;

  int omx = 0;
  int mx = 0;
  int omy = 0;
  int my = 0;

  Image img;
  Graphics ig;

  Dimension prefsize;

  float centre[] = new float[3];
  float width[] = new float[3];

  float max[] = new float[3];
  float min[] = new float[3];

  float maxwidth;
  float scale;

  int npoint;

  Vector points;
  float[][] orig;
  float[][] axes;

  int startx;
  int starty;

  int lastx;
  int lasty;

  int rectx1;
  int recty1;
  int rectx2;
  int recty2;

  float scalefactor = 1;

  AlignViewport av;

  public RotatableCanvas(AlignViewport av)
  {
    this.av = av;
  }

  public void setPoints(Vector points, int npoint)
  {
    this.points = points;
    this.npoint = npoint;
    this.av = av;
    PaintRefresher.Register(this, av.alignment);

    prefsize = getPreferredSize();
    orig = new float[npoint][3];

    for (int i = 0; i < npoint; i++)
    {
      SequencePoint sp = (SequencePoint) points.elementAt(i);
      for (int j = 0; j < 3; j++)
      {
        orig[i][j] = sp.coord[j];
      }
    }
    //Initialize the matrices to identity

    for (int i = 0; i < 3; i++)
    {
      for (int j = 0; j < 3; j++)
      {
        if (i != j)
        {
          idmat.addElement(i, j, 0);
          objmat.addElement(i, j, 0);
          rotmat.addElement(i, j, 0);
        }
        else
        {
          idmat.addElement(i, j, 0);
          objmat.addElement(i, j, 0);
          rotmat.addElement(i, j, 0);
        }
      }
    }

    axes = new float[3][3];
    initAxes();

    findCentre();
    findWidth();

    scale = findScale();

    //    System.out.println("Scale factor = " + scale);

    addMouseListener(this);
    addKeyListener(this);
    // if (getParent() != null) {
    //   getParent().addKeyListener(this);
    //}
    addMouseMotionListener(this);

    // Add rubberband
    //   rubberband  = new RubberbandRectangle(this);
    //  rubberband.setActive(true);
    //   rubberband.addListener(this);
  }

  /* public boolean handleSequenceSelectionEvent(SequenceSelectionEvent evt) {
     redrawneeded = true;
     repaint();
     return true;
   }

   public void removeNotify() {
     controller.removeListener(this);
     super.removeNotify();
   }*/

  public void initAxes()
  {
    for (int i = 0; i < 3; i++)
    {
      for (int j = 0; j < 3; j++)
      {
        if (i != j)
        {
          axes[i][j] = 0;
        }
        else
        {
          axes[i][j] = 1;
        }
      }
    }
  }

  public void findWidth()
  {
    max = new float[3];
    min = new float[3];

    max[0] = (float) - 1e30;
    max[1] = (float) - 1e30;
    max[2] = (float) - 1e30;

    min[0] = (float) 1e30;
    min[1] = (float) 1e30;
    min[2] = (float) 1e30;

    for (int i = 0; i < 3; i++)
    {
      for (int j = 0; j < npoint; j++)
      {
        SequencePoint sp = (SequencePoint) points.elementAt(j);
        if (sp.coord[i] >= max[i])
        {
          max[i] = sp.coord[i];
        }
        if (sp.coord[i] <= min[i])
        {
          min[i] = sp.coord[i];
        }
      }
    }

    //    System.out.println("xmax " + max[0] + " min " + min[0]);
    //System.out.println("ymax " + max[1] + " min " + min[1]);
    //System.out.println("zmax " + max[2] + " min " + min[2]);

    width[0] = Math.abs(max[0] - min[0]);
    width[1] = Math.abs(max[1] - min[1]);
    width[2] = Math.abs(max[2] - min[2]);

    maxwidth = width[0];

    if (width[1] > width[0])
    {
      maxwidth = width[1];
    }
    if (width[2] > width[1])
    {
      maxwidth = width[2];
    }

    //System.out.println("Maxwidth = " + maxwidth);
  }

  public float findScale()
  {
    int dim, width, height;
    if (getSize().width != 0)
    {
      width = getSize().width;
      height = getSize().height;
    }
    else
    {
      width = prefsize.width;
      height = prefsize.height;
    }

    if (width < height)
    {
      dim = width;
    }
    else
    {
      dim = height;
    }

    return (float) (dim * scalefactor / (2 * maxwidth));
  }

  public void findCentre()
  {
    //Find centre coordinate
    findWidth();

    centre[0] = (max[0] + min[0]) / 2;
    centre[1] = (max[1] + min[1]) / 2;
    centre[2] = (max[2] + min[2]) / 2;

    //    System.out.println("Centre x " + centre[0]);
    //System.out.println("Centre y " + centre[1]);
    //System.out.println("Centre z " + centre[2]);
  }

  public Dimension getPreferredSize()
  {
    if (prefsize != null)
    {
      return prefsize;
    }
    else
    {
      return new Dimension(400, 400);
    }
  }

  public Dimension getMinimumSize()
  {
    return getPreferredSize();
  }

  public void paint(Graphics g)
  {
    if (points == null)
    {
      g.setFont(new Font("Verdana", Font.PLAIN, 18));
      g.drawString("Calculating PCA....", 20, getSize().height / 2);
    }
    else
    {

      //Only create the image at the beginning -
      if ( (img == null) || (prefsize.width != getSize().width) ||
          (prefsize.height != getSize().height))
      {
        prefsize.width = getSize().width;
        prefsize.height = getSize().height;

        scale = findScale();

        //      System.out.println("New scale = " + scale);
        img = createImage(getSize().width, getSize().height);
        ig = img.getGraphics();

      }

      drawBackground(ig, Color.black);
      drawScene(ig);
      if (drawAxes == true)
      {
        drawAxes(ig);
      }

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

  public void drawAxes(Graphics g)
  {

    g.setColor(Color.yellow);
    for (int i = 0; i < 3; i++)
    {
      g.drawLine(getSize().width / 2, getSize().height / 2,
                 (int) (axes[i][0] * scale * max[0] + getSize().width / 2),
                 (int) (axes[i][1] * scale * max[1] + getSize().height / 2));
    }
  }

  public void drawBackground(Graphics g, Color col)
  {
    g.setColor(col);
    g.fillRect(0, 0, prefsize.width, prefsize.height);
  }

  public void drawScene(Graphics g)
  {
    boolean darker = false;

    int halfwidth = getSize().width / 2;
    int halfheight = getSize().height / 2;

    for (int i = 0; i < npoint; i++)
    {
      SequencePoint sp = (SequencePoint) points.elementAt(i);
      int x = (int) ( (float) (sp.coord[0] - centre[0]) * scale) + halfwidth;
      int y = (int) ( (float) (sp.coord[1] - centre[1]) * scale) + halfheight;
      float z = sp.coord[1] - centre[2];

      if (sp.sequence.getColor() == Color.black)
      {
        g.setColor(Color.white);
      }
      else
      {
        g.setColor(sp.sequence.getColor());
      }

      if (av.getSelectionGroup() != null)
      {
        if (av.getSelectionGroup().sequences.contains( ( (SequencePoint) points.
            elementAt(i)).sequence))
        {
          g.setColor(Color.gray);
        }
      }
      if (z < 0)
      {
        g.setColor(g.getColor().darker());
      }

      g.fillRect(x - 3, y - 3, 6, 6);
      g.setColor(Color.red);
    }
//    //Now the rectangle
//    if (rectx2 != -1 && recty2 != -1) {
//      g.setColor(Color.white);
//
//      g.drawRect(rectx1,recty1,rectx2-rectx1,recty2-recty1);
//    }
  }

  public Dimension minimumsize()
  {
    return prefsize;
  }

  public Dimension preferredsize()
  {
    return prefsize;
  }

  public void keyTyped(KeyEvent evt)
  {}

  public void keyReleased(KeyEvent evt)
  {}

  public void keyPressed(KeyEvent evt)
  {
    requestFocus();
    if (evt.getKeyCode() == KeyEvent.VK_UP)
    {
      scalefactor = (float) (scalefactor * 1.1);
      scale = findScale();
    }
    else if (evt.getKeyCode() == KeyEvent.VK_DOWN)
    {
      scalefactor = (float) (scalefactor * 0.9);
      scale = findScale();
    }
    else if (evt.getKeyChar() == 's')
    {
      System.err.println("DEBUG: Rectangle selection"); // log.debug
      if (rectx2 != -1 && recty2 != -1)
      {
        rectSelect(rectx1, recty1, rectx2, recty2);

      }
    }
    repaint();
  }

  public void printPoints()
  {
    for (int i = 0; i < npoint; i++)
    {
      SequencePoint sp = (SequencePoint) points.elementAt(i);
      Format.print(System.out, "%5d ", i);
      for (int j = 0; j < 3; j++)
      {
        Format.print(System.out, "%13.3f  ", sp.coord[j]);
      }
      System.out.println();
    }
  }

  public void mouseClicked(MouseEvent evt)
  {}

  public void mouseEntered(MouseEvent evt)
  {}

  public void mouseExited(MouseEvent evt)
  {}

  public void mouseReleased(MouseEvent evt)
  {}

  public void mousePressed(MouseEvent evt)
  {
    int x = evt.getX();
    int y = evt.getY();

    mx = x;
    my = y;

    omx = mx;
    omy = my;

    startx = x;
    starty = y;

    rectx1 = x;
    recty1 = y;

    rectx2 = -1;
    recty2 = -1;

    SequenceI found = findPoint(x, y);

    if (found != null)
    {
      if (av.getSelectionGroup() != null)
      {
        av.getSelectionGroup().addOrRemove(found, true);
        av.getSelectionGroup().setEndRes(av.alignment.getWidth()-1);
        PaintRefresher.Refresh(this, av.alignment);
      }
      else
      {
        av.setSelectionGroup(new SequenceGroup());
        av.getSelectionGroup().addOrRemove(found, true);
        av.getSelectionGroup().setEndRes(av.alignment.getWidth()-1);

      }
    }
    repaint();
  }

  // private void fireSequenceSelectionEvent(Selection sel) {
  //   controller.handleSequenceSelectionEvent(new SequenceSelectionEvent(this,sel));
  //}

  public void mouseMoved(MouseEvent evt)
  {
    // SequenceI found = findPoint(evt.getX(), evt.getY());
  }

  public void mouseDragged(MouseEvent evt)
  {
    mx = evt.getX();
    my = evt.getY();
    //Check if this is a rectangle drawing drag
    if ( (evt.getModifiers() & InputEvent.BUTTON2_MASK) != 0)
    {
//      rectx2 = evt.getX();
//      recty2 = evt.getY();
    }
    else
    {
      rotmat.setIdentity();

      rotmat.rotate( (float) (my - omy), 'x');
      rotmat.rotate( (float) (mx - omx), 'y');

      for (int i = 0; i < npoint; i++)
      {
        SequencePoint sp = (SequencePoint) points.elementAt(i);
        sp.coord[0] -= centre[0];
        sp.coord[1] -= centre[1];
        sp.coord[2] -= centre[2];

        //Now apply the rotation matrix
        sp.coord = rotmat.vectorMultiply(sp.coord);

        //Now translate back again
        sp.coord[0] += centre[0];
        sp.coord[1] += centre[1];
        sp.coord[2] += centre[2];
      }

      for (int i = 0; i < 3; i++)
      {
        axes[i] = rotmat.vectorMultiply(axes[i]);
      }
      omx = mx;
      omy = my;

      paint(this.getGraphics());
    }

  }

  public void rectSelect(int x1, int y1, int x2, int y2)
  {
    boolean changedSel = false;
    for (int i = 0; i < npoint; i++)
    {
      SequencePoint sp = (SequencePoint) points.elementAt(i);
      int tmp1 = (int) ( (sp.coord[0] - centre[0]) * scale +
                        (float) getSize().width / 2.0);
      int tmp2 = (int) ( (sp.coord[1] - centre[1]) * scale +
                        (float) getSize().height / 2.0);

      if (tmp1 > x1 && tmp1 < x2 && tmp2 > y1 && tmp2 < y2)
      {
        if (av != null)
        {
          if (!av.getSelectionGroup().sequences.contains(sp.sequence))
          {
            av.getSelectionGroup().addSequence(sp.sequence, true);
          }
        }
      }
    }
  }

  public SequenceI findPoint(int x, int y)
  {

    int halfwidth = getSize().width / 2;
    int halfheight = getSize().height / 2;

    int found = -1;

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

      SequencePoint sp = (SequencePoint) points.elementAt(i);
      int px = (int) ( (float) (sp.coord[0] - centre[0]) * scale) + halfwidth;
      int py = (int) ( (float) (sp.coord[1] - centre[1]) * scale) + halfheight;

      if (Math.abs(px - x) < 3 && Math.abs(py - y) < 3)
      {
        found = i;
      }
    }
    if (found != -1)
    {
      return ( (SequencePoint) points.elementAt(found)).sequence;
    }
    else
    {
      return null;
    }
  }
  /*  public boolean handleRubberbandEvent(RubberbandEvent evt) {
      System.out.println("Rubberband handler called in RotatableCanvas with " +
                         evt.getBounds());

      Rubberband rb = (Rubberband)evt.getSource();

      // Clear the current selection (instance variable)
      //if ((rb.getModifiers() & Event.SHIFT_MASK) == 0) {
      //   clearSelection();
      //}

      if (rb.getComponent() == this) {
        Rectangle bounds = evt.getBounds();
   rectSelect(bounds.x,bounds.y,bounds.x+bounds.width,bounds.y+bounds.height);
      }

      redrawneeded = true;
      paint(this.getGraphics());

      return true;
    }*/

}