/*

 * Copyright (c) 1995, 2011, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

import java.applet.Applet;

import java.awt.Image;

import java.awt.Graphics;

import java.awt.Dimension;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import java.net.URL;

import java.awt.image.IndexColorModel;

import java.awt.image.MemoryImageSource;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.StreamTokenizer;

import java.util.HashMap;

import java.util.Map;

import java.util.logging.Level;

import java.util.logging.Logger;

/*

 * A set of classes to parse, represent and display Chemical compounds in

 * .xyz format (see http://chem.leeds.ac.uk/Project/MIME.html)

 */

/** The representation of a Chemical .xyz model */

final class XYZChemModel {

    float vert[];

    Atom atoms[];

    int tvert[];

    int ZsortMap[];

    int nvert, maxvert;

    static final Map<String, Atom> atomTable = new HashMap<String, Atom>();

    static Atom defaultAtom;

    static {

        atomTable.put("c", new Atom(0, 0, 0));

        atomTable.put("h", new Atom(210, 210, 210));

        atomTable.put("n", new Atom(0, 0, 255));

        atomTable.put("o", new Atom(255, 0, 0));

        atomTable.put("p", new Atom(255, 0, 255));

        atomTable.put("s", new Atom(255, 255, 0));

        atomTable.put("hn", new Atom(150, 255, 150)); /* !!*/

        defaultAtom = new Atom(255, 100, 200);

    }

    boolean transformed;

    Matrix3D mat;

    float xmin, xmax, ymin, ymax, zmin, zmax;

    XYZChemModel() {

        mat = new Matrix3D();

        mat.xrot(20);

        mat.yrot(30);

    }

    /** Create a Chemical model by parsing an input stream */

    XYZChemModel(InputStream is) throws Exception {

        this();

        StreamTokenizer st = new StreamTokenizer(

                new BufferedReader(new InputStreamReader(is, "UTF-8")));

        st.eolIsSignificant(true);

        st.commentChar('#');

        try {

            scan:

            while (true) {

                switch (st.nextToken()) {

                    case StreamTokenizer.TT_EOF:

                        break scan;

                    default:

                        break;

                    case StreamTokenizer.TT_WORD:

                        String name = st.sval;

                        double x = 0,

                         y = 0,

                         z = 0;

                        if (st.nextToken() == StreamTokenizer.TT_NUMBER) {

                            x = st.nval;

                            if (st.nextToken() == StreamTokenizer.TT_NUMBER) {

                                y = st.nval;

                                if (st.nextToken() == StreamTokenizer.TT_NUMBER) {

                                    z = st.nval;

                                }

                            }

                        }

                        addVert(name, (float) x, (float) y, (float) z);

                        while (st.ttype != StreamTokenizer.TT_EOL

                                && st.ttype != StreamTokenizer.TT_EOF) {

                            st.nextToken();

                        }

                }   // end Switch

            }  // end while

            is.close();

        } // end Try

        catch (IOException e) {

        }

        if (st.ttype != StreamTokenizer.TT_EOF) {

            throw new Exception(st.toString());

        }

    }  // end XYZChemModel()

    /** Add a vertex to this model */

    int addVert(String name, float x, float y, float z) {

        int i = nvert;

        if (i >= maxvert) {

            if (vert == null) {

                maxvert = 100;

                vert = new float[maxvert * 3];

                atoms = new Atom[maxvert];

            } else {

                maxvert *= 2;

                float nv[] = new float[maxvert * 3];

                System.arraycopy(vert, 0, nv, 0, vert.length);

                vert = nv;

                Atom na[] = new Atom[maxvert];

                System.arraycopy(atoms, 0, na, 0, atoms.length);

                atoms = na;

            }

        }

        Atom a = atomTable.get(name.toLowerCase());

        if (a == null) {

            a = defaultAtom;

        }

        atoms[i] = a;

        i *= 3;

        vert[i] = x;

        vert[i + 1] = y;

        vert[i + 2] = z;

        return nvert++;

    }

    /** Transform all the points in this model */

    void transform() {

        if (transformed || nvert <= 0) {

            return;

        }

        if (tvert == null || tvert.length < nvert * 3) {

            tvert = new int[nvert * 3];

        }

        mat.transform(vert, tvert, nvert);

        transformed = true;

    }

    /** Paint this model to a graphics context.  It uses the matrix associated

    with this model to map from model space to screen space.

    The next version of the browser should have double buffering,

    which will make this *much* nicer */

    void paint(Graphics g) {

        if (vert == null || nvert <= 0) {

            return;

        }

        transform();

        int v[] = tvert;

        int zs[] = ZsortMap;

        if (zs == null) {

            ZsortMap = zs = new int[nvert];

            for (int i = nvert; --i >= 0;) {

                zs[i] = i * 3;

            }

        }

        /*

         * I use a bubble sort since from one iteration to the next, the sort

         * order is pretty stable, so I just use what I had last time as a

         * "guess" of the sorted order.  With luck, this reduces O(N log N)

         * to O(N)

         */

        for (int i = nvert - 1; --i >= 0;) {

            boolean flipped = false;

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

                int a = zs[j];

                int b = zs[j + 1];

                if (v[a + 2] > v[b + 2]) {

                    zs[j + 1] = a;

                    zs[j] = b;

                    flipped = true;

                }

            }

            if (!flipped) {

                break;

            }

        }

        int lim = nvert;

        if (lim <= 0 || nvert <= 0) {

            return;

        }

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

            int j = zs[i];

            int grey = v[j + 2];

            if (grey < 0) {

                grey = 0;

            }

            if (grey > 15) {

                grey = 15;

            }

            // g.drawString(names[i], v[j], v[j+1]);

            atoms[j / 3].paint(g, v[j], v[j + 1], grey);

            // g.drawImage(iBall, v[j] - (iBall.width >> 1), v[j + 1] -

            // (iBall.height >> 1));

        }

    }

    /** Find the bounding box of this model */

    void findBB() {

        if (nvert <= 0) {

            return;

        }

        float v[] = vert;

        float _xmin = v[0], _xmax = _xmin;

        float _ymin = v[1], _ymax = _ymin;

        float _zmin = v[2], _zmax = _zmin;

        for (int i = nvert * 3; (i -= 3) > 0;) {

            float x = v[i];

            if (x < _xmin) {

                _xmin = x;

            }

            if (x > _xmax) {

                _xmax = x;

            }

            float y = v[i + 1];

            if (y < _ymin) {

                _ymin = y;

            }

            if (y > _ymax) {

                _ymax = y;

            }

            float z = v[i + 2];

            if (z < _zmin) {

                _zmin = z;

            }

            if (z > _zmax) {

                _zmax = z;

            }

        }

        this.xmax = _xmax;

        this.xmin = _xmin;

        this.ymax = _ymax;

        this.ymin = _ymin;

        this.zmax = _zmax;

        this.zmin = _zmin;

    }

}

/** An applet to put a Chemical model into a page */

@SuppressWarnings("serial")

public class XYZApp extends Applet implements Runnable, MouseListener,

        MouseMotionListener {

    XYZChemModel md;

    boolean painted = true;

    float xfac;

    int prevx, prevy;

    float scalefudge = 1;

    Matrix3D amat = new Matrix3D(), tmat = new Matrix3D();

    String mdname = null;

    String message = null;

    Image backBuffer;

    Graphics backGC;

    Dimension backSize;

    private synchronized void newBackBuffer() {

        backBuffer = createImage(getSize().width, getSize().height);

        if (backGC != null) {

            backGC.dispose();

        }

        backGC = backBuffer.getGraphics();

        backSize = getSize();

    }

    @Override

    public void init() {

        mdname = getParameter("model");

        try {

            scalefudge = Float.valueOf(getParameter("scale")).floatValue();

        } catch (Exception ignored) {

        }

        amat.yrot(20);

        amat.xrot(20);

        if (mdname == null) {

            mdname = "model.obj";

        }

        resize(getSize().width <= 20 ? 400 : getSize().width,

                getSize().height <= 20 ? 400 : getSize().height);

        newBackBuffer();

        addMouseListener(this);

        addMouseMotionListener(this);

    }

    @Override

    public void destroy() {

        removeMouseListener(this);

        removeMouseMotionListener(this);

    }

    @Override

    public void run() {

        InputStream is = null;

        try {

            Thread.currentThread().setPriority(Thread.MIN_PRIORITY);

            is = getClass().getResourceAsStream(mdname);

            XYZChemModel m = new XYZChemModel(is);

            Atom.setApplet(this);

            md = m;

            m.findBB();

            float xw = m.xmax - m.xmin;

            float yw = m.ymax - m.ymin;

            float zw = m.zmax - m.zmin;

            if (yw > xw) {

                xw = yw;

            }

            if (zw > xw) {

                xw = zw;

            }

            float f1 = getSize().width / xw;

            float f2 = getSize().height / xw;

            xfac = 0.7f * (f1 < f2 ? f1 : f2) * scalefudge;

        } catch (Exception e) {

            Logger.getLogger(XYZApp.class.getName()).log(Level.SEVERE, null, e);

            md = null;

            message = e.toString();

        }

        try {

            if (is != null) {

                is.close();

            }

        } catch (Exception ignored) {

        }

        repaint();

    }

    @Override

    public void start() {

        if (md == null && message == null) {

            new Thread(this).start();

        }

    }

    @Override

    public void stop() {

    }

    /* event handling */

    @Override

    public void mouseClicked(MouseEvent e) {

    }

    @Override

    public void mousePressed(MouseEvent e) {

        prevx = e.getX();

        prevy = e.getY();

        e.consume();

    }

    @Override

    public void mouseReleased(MouseEvent e) {

    }

    @Override

    public void mouseEntered(MouseEvent e) {

    }

    @Override

    public void mouseExited(MouseEvent e) {

    }

    @Override

    public void mouseDragged(MouseEvent e) {

        int x = e.getX();

        int y = e.getY();

        tmat.unit();

        float xtheta = (prevy - y) * (360.0f / getSize().width);

        float ytheta = (x - prevx) * (360.0f / getSize().height);

        tmat.xrot(xtheta);

        tmat.yrot(ytheta);

        amat.mult(tmat);

        if (painted) {

            painted = false;

            repaint();

        }

        prevx = x;

        prevy = y;

        e.consume();

    }

    @Override

    public void mouseMoved(MouseEvent e) {

    }

    @Override

    public void update(Graphics g) {

        if (backBuffer == null) {

            g.clearRect(0, 0, getSize().width, getSize().height);

        }

        paint(g);

    }

    @Override

    public void paint(Graphics g) {

        if (md != null) {

            md.mat.unit();

            md.mat.translate(-(md.xmin + md.xmax) / 2,

                    -(md.ymin + md.ymax) / 2,

                    -(md.zmin + md.zmax) / 2);

            md.mat.mult(amat);

            // md.mat.scale(xfac, -xfac, 8 * xfac / getSize().width);

            md.mat.scale(xfac, -xfac, 16 * xfac / getSize().width);

            md.mat.translate(getSize().width / 2, getSize().height / 2, 8);

            md.transformed = false;

            if (backBuffer != null) {

                if (!backSize.equals(getSize())) {

                    newBackBuffer();

                }

                backGC.setColor(getBackground());

                backGC.fillRect(0, 0, getSize().width, getSize().height);

                md.paint(backGC);

                g.drawImage(backBuffer, 0, 0, this);

            } else {

                md.paint(g);

            }

            setPainted();

        } else if (message != null) {

            g.drawString("Error in model:", 3, 20);

            g.drawString(message, 10, 40);

        }

    }

    private synchronized void setPainted() {

        painted = true;

        notifyAll();

    }

    @Override

    public String getAppletInfo() {

        return "Title: XYZApp \nAuthor: James Gosling \nAn applet to put"

                + " a Chemical model into a page.";

    }

    @Override

    public String[][] getParameterInfo() {

        String[][] info = {

            { "model", "path string", "The path to the model to be displayed"

                + " in .xyz format "

                + "(see http://chem.leeds.ac.uk/Project/MIME.html)."

                + "  Default is model.obj." },

            { "scale", "float", "Scale factor.  Default is 1 (i.e. no scale)." }

        };

        return info;

    }

}   // end class XYZApp

class Atom {