/*
 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
 * Copyright (C) $$Year-Rel$$ The Jalview Authors
 * 
 * This file is part of Jalview.
 * 
 * Jalview 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 3
 * of the License, or (at your option) any later version.
 *  
 * Jalview 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 Jalview.  If not, see <http://www.gnu.org/licenses/>.
 * The Jalview Authors are detailed in the 'AUTHORS' file.
 */
package jalview.appletgui;

import jalview.api.RotatableCanvasI;
import jalview.datamodel.SequenceGroup;
import jalview.datamodel.SequenceI;
import jalview.datamodel.SequencePoint;
import jalview.math.RotatableMatrix;
import jalview.util.Format;
import jalview.util.MessageManager;
import jalview.viewmodel.AlignmentViewport;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import awt2swing.Panel;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Vector;

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

  RotatableMatrix objmat = new RotatableMatrix(3, 3);

  RotatableMatrix rotmat = new RotatableMatrix(3, 3);

  String tooltip;

  int toolx, tooly;

  // 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;

  AlignmentViewport av;

  boolean showLabels = false;

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

  public void showLabels(boolean b)
  {
    showLabels = b;
    repaint();
  }

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

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

  public void PaintComponent(Graphics g)
  {
    if (points == null)
    {
      g.setFont(new Font("Verdana", Font.PLAIN, 18));
      awt2swing.Util.drawString(g, MessageManager.getString("label.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);
      }

      if (tooltip != null)
      {
        ig.setColor(Color.red);
        awt2swing.Util.drawString(ig, tooltip, toolx, tooly);
      }

      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) ((sp.coord[0] - centre[0]) * scale) + halfwidth;
      int y = (int) ((sp.coord[1] - centre[1]) * scale)
              + halfheight;
      float z = sp.coord[1] - centre[2];

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

      if (av.getSelectionGroup() != null)
      {
        if (av.getSelectionGroup().getSequences(null)
                .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);
      if (showLabels)
      {
        g.setColor(Color.red);
        awt2swing.Util.drawString(g, 
                ((SequencePoint) points.elementAt(i)).sequence.getName(),
                x - 3, y - 4);
      }
    }
  }

  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)
  {
    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.printLong(System.out, "%5d ", i);
      for (int j = 0; j < 3; j++)
      {
        Format.printDouble(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)
    {
      // TODO: applet PCA is not associatable with multi-panels - only parent
      // view
      if (av.getSelectionGroup() != null)
      {
        av.getSelectionGroup().addOrRemove(found, true);
        av.getSelectionGroup().setEndRes(av.getAlignment().getWidth() - 1);
      }
      else
      {
        av.setSelectionGroup(new SequenceGroup());
        av.getSelectionGroup().addOrRemove(found, true);
        av.getSelectionGroup().setEndRes(av.getAlignment().getWidth() - 1);

      }
      PaintRefresher.Refresh(this, av.getSequenceSetId());
      av.sendSelection();
    }
    repaint();
  }

  public void mouseMoved(MouseEvent evt)
  {
    SequenceI found = findPoint(evt.getX(), evt.getY());
    if (found == null)
    {
      tooltip = null;
    }
    else
    {
      tooltip = found.getName();
      toolx = evt.getX();
      tooly = evt.getY();
    }
    repaint();
  }

  public void mouseDragged(MouseEvent evt)
  {
    mx = evt.getX();
    my = evt.getY();

    rotmat.setIdentity();

    rotmat.rotate(my - omy, 'x');
    rotmat.rotate(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 + getSize().width / 2.0);
      int tmp2 = (int) ((sp.coord[1] - centre[1]) * scale + getSize().height / 2.0);

      if (tmp1 > x1 && tmp1 < x2 && tmp2 > y1 && tmp2 < y2)
      {
        if (av != null)
        {
          if (!av.getSelectionGroup().getSequences(null)
                  .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) ((sp.coord[0] - centre[0]) * scale)
              + halfwidth;
      int py = (int) ((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;
    }
  }

}