package ui;

import static com.jogamp.opengl.fixedfunc.GLMatrixFunc.GL_MODELVIEW;
import static com.jogamp.opengl.fixedfunc.GLMatrixFunc.GL_PROJECTION;

import java.nio.FloatBuffer;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.opengl.GLCanvas;
import org.eclipse.swt.opengl.GLData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GLContext;
import com.jogamp.opengl.GLDrawableFactory;
import com.jogamp.opengl.GLProfile;
import com.jogamp.opengl.glu.GLU;


public class Draw {
    private static float cameraDistance = 40.0f;
    private static List<SceneObject> list = new ArrayList<SceneObject>();
    
    public static void main(String[] args) {
        final Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        Composite comp = new Composite(shell, SWT.NONE);
        comp.setLayout(new FillLayout());
        GLData data = new GLData();
        data.doubleBuffer = true;
        final GLCanvas canvas = new GLCanvas(comp, SWT.NO_BACKGROUND, data);

        canvas.setCurrent();
        GLProfile glprofile = GLProfile.getDefault();
        final GLContext context = GLDrawableFactory.getFactory(glprofile).createExternalGLContext();

        GL2 gl2 = context.getGL().getGL2();
        canvas.addControlListener(new ControlAdapter() {
            @Override
            public void controlResized(ControlEvent e) {
                Rectangle rect = canvas.getClientArea();
                canvas.setCurrent();
                context.makeCurrent();
                reshape(gl2, rect.width, rect.height);
                context.release();
            }
        });

        context.makeCurrent();
        init(gl2);
        context.release();
        canvas.addPaintListener(new PaintListener() {

            @Override
            public void paintControl(PaintEvent e) {
                canvas.setCurrent();
                context.makeCurrent();
                display(gl2);
                canvas.swapBuffers();
                context.release();
            }
        });
        
        canvas.addMouseListener(new MouseListener() {           
            @Override
            public void mouseDoubleClick(MouseEvent e) {
                
            }

            @Override
            public void mouseDown(MouseEvent e) {
                if(e.button == 1) {
                    int[] viewport = new int[4];
                    
                    gl2.glGetIntegerv(GL2.GL_VIEWPORT, viewport, 0);
                    float[] winZ = new float[1];
                    float[] color = new float[3];
                    gl2.glReadPixels(e.x, viewport[3] - e.y, 1, 1, GL2.GL_DEPTH_COMPONENT, GL2.GL_FLOAT, FloatBuffer.wrap(winZ));
                    gl2.glReadPixels(e.x, viewport[3] - e.y, 1, 1, GL2.GL_RGB, GL2.GL_FLOAT, FloatBuffer.wrap(color));  
                    System.out.println(winZ[0]);
                    System.out.println(color[0] + "," + color[1] + "," + color[2]);
                    
                    for(int i = 0; i < list.size(); i++) {
                        if(list.get(i).m_colorID.equals(color)) {
                            System.out.println("select " + list.get(i).getName());
                            break;
                        }
                    }
                }
            }

            @Override
            public void mouseUp(MouseEvent e) {

            }
        });

        shell.setText("SWT/Cylinder Example");
        shell.setSize(640, 480);
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }

    static void reshape(GL2 gl2, int width, int height) {
        System.out.println("reshape...");
        if (height == 0) {
            height = 1;
        }

        gl2.glViewport(0, 0, width, height);
        
        GLU glu = new GLU();
        gl2.glMatrixMode(GL_PROJECTION); 
        gl2.glLoadIdentity(); 
        glu.gluPerspective(60.0f, (float) width / (float) height, 1.0f, 100.0f); 
        gl2.glMatrixMode(GL_MODELVIEW);
    }

    static void init(GL2 gl2) {
        System.out.println("init...");
        gl2.glShadeModel(GL2.GL_SMOOTH);
        gl2.glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
        gl2.glClearDepth(1.0f);
        gl2.glEnable(GL2.GL_DEPTH_TEST);
        gl2.glDepthFunc(GL2.GL_LEQUAL);
        gl2.glHint(GL2.GL_PERSPECTIVE_CORRECTION_HINT, GL2.GL_NICEST);
    }

    static void display(GL2 gl2) {
        System.out.println("display...");

        gl2.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);
        float[] triangle_1_position = {0, -4, -cameraDistance};
        SceneObject triangle_1 = new SceneObject(triangle_1_position, "triangle_1", gl2);
        triangle_1.m_colorID = new int[]{255, 0, 0};
        triangle_1.picking();
        
        float[] triangle_2_position = {0, -8, -cameraDistance};
        SceneObject triangle_2 = new SceneObject(triangle_2_position, "triangle_2", gl2);
        triangle_2.m_colorID = new int[]{0, 255, 0};
        triangle_2.picking();
        
        list.add(triangle_1);
        list.add(triangle_2);
    }
    
}