package simplebrowser.prototype;

import java.awt.Dimension;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;

import javax.media.opengl.DebugGL3;
import javax.media.opengl.GL3;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLCapabilitiesImmutable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLException;
import javax.media.opengl.GLProfile;
import javax.media.opengl.GLRunnable;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.vecmath.Vector3f;

import jogamp.graph.curve.text.GlyphString;

import simplebrowser.prototype.gl.BufferObject;
import simplebrowser.prototype.gl.VertexArrayObject;

import com.jogamp.common.nio.Buffers;
import com.jogamp.graph.curve.opengl.GLRegion;
import com.jogamp.graph.curve.opengl.RegionRenderer;
import com.jogamp.graph.curve.opengl.RenderState;
import com.jogamp.graph.curve.opengl.TextRenderer;
import com.jogamp.graph.font.Font;
import com.jogamp.graph.font.FontFactory;
import com.jogamp.graph.geom.opengl.SVertex;
import com.jogamp.newt.awt.NewtCanvasAWT;
import com.jogamp.newt.opengl.GLWindow;
import com.jogamp.opengl.util.Animator;
import com.jogamp.opengl.util.PMVMatrix;
import com.jogamp.opengl.util.glsl.ShaderState;

public class TestTextRendering_v2 implements GLEventListener {
	JFrame frame = null;
	NewtCanvasAWT canvas = null;
	static GLWindow glw = null;
	
	public static Font font;
	public static RenderState renderState = null;
    public static TextRenderer textRenderer = null;
    
	void init2() {
		// 1) capabilities
		GLProfile profile = GLProfile.get(GLProfile.GL3);
        GLCapabilities capabilities = new GLCapabilities(profile);
        
        capabilities.setDoubleBuffered(true);
        capabilities.setSampleBuffers(true);
        
        // 2) create window
        glw = GLWindow.create(capabilities);
        
        // 3) create canvas
		canvas = new NewtCanvasAWT(glw);		
        //canvas.setPreferredSize(new Dimension(500, 500));
        
        glw.addGLEventListener(this);
        
        // 4) create frame
        frame = new JFrame("TEXT RENDERER");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(800, 800);
        frame.add(canvas);
        frame.pack();
        frame.setVisible(true);
	}
		
	public static void main(String[] args) {
		final TestTextRendering_v2 tr = new TestTextRendering_v2();
        
		tr.init2();
	}

	@Override
	public void display(GLAutoDrawable drawable) {
		System.out.println("display");
			
		GL3 gl = new DebugGL3(drawable.getGL().getGL3());
		drawable.setGL(gl);
					
		gl.glClear(GL3.GL_COLOR_BUFFER_BIT | GL3.GL_DEPTH_BUFFER_BIT);		
		int width = drawable.getWidth();
		int height = drawable.getHeight();
			
		if(!textRenderer.isInitialized()) {
			textRenderer.init(gl);
			textRenderer.setAlpha(gl, 1.0f);
			textRenderer.setColorStatic(gl, 1, 0, 0);
		}
			
		textRenderer.getShaderState().useProgram(gl, true);
			
		textRenderer.reshapePerspective(null, 45.0f, width, height, 0.1f, 7000.0f);  // has probably no effect
		textRenderer.reshapeOrtho(null, width, height, 0.1f, 7000.0f);

	        final float[] textPosition = new float[] {0, 0, 0};
	        final int[] texSize = new int[] { 400 }; 
	        final int fontSize = 50;
	        
	        textRenderer.resetModelview(null);
	        textRenderer.translate(gl, 250, 250, -6000);
	        textRenderer.updateMatrix(gl);
	        textRenderer.drawString3D(gl, font, "Hi", textPosition, fontSize, texSize);
	        
	        textRenderer.getShaderState().useProgram(gl, false);
	        
	        // UNCOMMENT BELOW TO MAKE APPLICATION THROW AN EXCEPTION IN THE NEXT CALL TO DISPLAY
	        gl.glBindVertexArray(0); 
	}
	
	@Override
	public void dispose(GLAutoDrawable drawable) {
	}


	@Override
	public void init(GLAutoDrawable drawable) {
		System.out.println("init");
		
		GL3 gl = new DebugGL3(drawable.getGL().getGL3());
		drawable.setGL(gl);
		
		gl.glEnable(GL3.GL_DEPTH_TEST);
		gl.glEnable(GL3.GL_MULTISAMPLE);
		
        try {
			font = FontFactory.get(FontFactory.UBUNTU).getDefault();
			
			renderState = RenderState.createRenderState(new ShaderState(), SVertex.factory());
	        textRenderer = TextRenderer.create(renderState, 0);	  
		} catch(Exception e) {
			throw new RuntimeException(e);
		}
        
        // here, I would create a VA, IB, VB, set them up, etc, only to finally break the bind 
        // on the vertex array        
	}

	@Override
	public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3,
			int arg4) {
	}

}