package jraphics;
import java.awt.*;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Arrays;

import javax.swing.*;

public class Jraphics extends JPanel{
	static Mesh meshCube;
	static Mat4x4 matProj;
	static Jraphics panel;
	static long delta = 0;
	public static void main(String[] args) {
		final long startTime = System.nanoTime();
		JFrame.setDefaultLookAndFeelDecorated(true);
		JFrame frame =  new JFrame("Graphics");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setBackground(Color.white);
		frame.setSize(200,200);

		panel = new Jraphics();
		frame.add(panel);
		frame.setVisible(true);


		meshCube = new Mesh();
		meshCube.tris.add(new Triangle(new Vector3(0.0,0.0,0.0),   new Vector3(0.0,1.0,0.0),    new Vector3(1.0,1.0,0.0)));
		meshCube.tris.add(new Triangle(new Vector3(0.0,0.0,0.0),   new Vector3(1.0,1.0,0.0),    new Vector3(1.0,0.0,0.0)));

		meshCube.tris.add(new Triangle(new Vector3(1.0,0.0,0.0),   new Vector3(1.0,1.0,0.0),    new Vector3(1.0,1.0,1.0)));
		meshCube.tris.add(new Triangle(new Vector3(1.0,0.0,0.0),   new Vector3(1.0,1.0,1.0),    new Vector3(1.0,0.0,1.0)));

		meshCube.tris.add(new Triangle(new Vector3(1.0,0.0,1.0),   new Vector3(1.0,1.0,1.0),    new Vector3(0.0,1.0,1.0)));
		meshCube.tris.add(new Triangle(new Vector3(1.0,0.0,1.0),   new Vector3(0.0,1.0,1.0),    new Vector3(0.0,0.0,1.0)));

		meshCube.tris.add(new Triangle(new Vector3(0.0,0.0,1.0),   new Vector3(0.0,1.0,1.0),    new Vector3(0.0,1.0,0.0)));
		meshCube.tris.add(new Triangle(new Vector3(0.0,0.0,1.0),   new Vector3(0.0,1.0,0.0),    new Vector3(0.0,0.0,0.0)));

		meshCube.tris.add(new Triangle(new Vector3(0.0,1.0,0.0),   new Vector3(0.0,1.0,1.0),    new Vector3(1.0,1.0,1.0)));
		meshCube.tris.add(new Triangle(new Vector3(0.0,1.0,0.0),   new Vector3(1.0,1.0,1.0),    new Vector3(1.0,1.0,0.0)));

		meshCube.tris.add(new Triangle(new Vector3(1.0,0.0,1.0),   new Vector3(0.0,0.0,1.0),    new Vector3(0.0,0.0,0.0)));
		meshCube.tris.add(new Triangle(new Vector3(1.0,0.0,1.0),   new Vector3(0.0,0.0,0.0),    new Vector3(1.0,0.0,0.0)));

		double fNear = 0.1;
		double fFar = 1000.0;
		double fFov = 90.0;
		double fAspectRatio = (double)panel.getSize().height / (double)panel.getSize().width;
		double fFovRad = 1.0 / Math.tan(fFov * 0.5 / 180.0 * 3.14159);

		matProj = new Mat4x4();
		matProj.m[0][0] = fAspectRatio * fFovRad;
		matProj.m[1][1] = fFovRad;
		matProj.m[2][2] = fFar / (fFar - fNear);
		matProj.m[3][2] = (-fFar * fNear) / (fFar - fNear);
		matProj.m[2][3] = 1.0;
		matProj.m[3][3] = 0;

		while(true) {
			if(System.nanoTime() % 100000000 == 0) {
				frame.repaint();
			}
			long cTime = System.nanoTime();
			delta = cTime - delta;

		}

	}


	@Override
	public void paintComponent(Graphics g) {
		g.setColor(Color.BLACK);

		Mat4x4 matRotZ = new Mat4x4();
		Mat4x4 matRotX = new Mat4x4();

		long fTheta = delta;

		matRotZ.m[0][0] = Math.cos(fTheta);
		matRotZ.m[0][1] = Math.sin(fTheta);
		matRotZ.m[1][0] = - Math.sin(fTheta);
		matRotZ.m[1][1] = Math.cos(fTheta);
		matRotZ.m[2][2] = 1;
		matRotZ.m[3][3] = 1;

		matRotX.m[0][0] = 1;
		matRotX.m[0][1] = Math.cos(fTheta * 0.5);
		matRotX.m[1][0] = Math.sin(fTheta * 0.5);
		matRotX.m[1][1] = - Math.sin(fTheta * 0.5);
		matRotX.m[2][2] = Math.cos(fTheta * 0.5);
		matRotX.m[3][3] = 1;



		for(Triangle tri : meshCube.tris) {
			Triangle triProjected = new Triangle(new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0));
			Triangle triRotatedZ = new Triangle(new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0));
			Triangle triRotatedZX = new Triangle(new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0));

			triRotatedZ.p.set(0, MultiplyMatrixVector(tri.p.get(0), matRotZ));
			triRotatedZ.p.set(1, MultiplyMatrixVector(tri.p.get(1), matRotZ));
			triRotatedZ.p.set(2, MultiplyMatrixVector(tri.p.get(2), matRotZ));

			triRotatedZX.p.set(0, MultiplyMatrixVector(triRotatedZ.p.get(0), matRotX));
			triRotatedZX.p.set(1, MultiplyMatrixVector(triRotatedZ.p.get(1), matRotX));
			triRotatedZX.p.set(2, MultiplyMatrixVector(triRotatedZ.p.get(2), matRotX));

			Triangle triTranslated = new Triangle(triRotatedZX.p.get(0), triRotatedZX.p.get(1), triRotatedZX.p.get(2));

			triTranslated.p.get(0).z = triRotatedZX.p.get(0).z + 3.0;
			triTranslated.p.get(1).z = triRotatedZX.p.get(1).z + 3.0;
			triTranslated.p.get(2).z = triRotatedZX.p.get(2).z + 3.0;



			triProjected.p.set(0, MultiplyMatrixVector(triTranslated.p.get(0), matProj));
			triProjected.p.set(1, MultiplyMatrixVector(triTranslated.p.get(1), matProj));
			triProjected.p.set(2, MultiplyMatrixVector(triTranslated.p.get(2), matProj));

			triProjected.p.get(0).x += 1;
			triProjected.p.get(0).y += 1;
			triProjected.p.get(1).x += 1;
			triProjected.p.get(1).y += 1;
			triProjected.p.get(2).x += 1;
			triProjected.p.get(2).y += 1;

			triProjected.p.get(0).x *= 0.5 * (double) panel.getSize().width;
			triProjected.p.get(0).y *= 0.5 * (double) panel.getSize().height;
			triProjected.p.get(1).x *= 0.5 * (double) panel.getSize().width;
			triProjected.p.get(1).y *= 0.5 * (double) panel.getSize().height;
			triProjected.p.get(2).x *= 0.5 * (double) panel.getSize().width;
			triProjected.p.get(2).y *= 0.5 * (double) panel.getSize().height;


			int[] xPoints = {(int)triProjected.p.get(0).x,  (int)triProjected.p.get(1).x,  (int)triProjected.p.get(2).x};
			int[] yPoints = {(int)triProjected.p.get(0).y, (int)triProjected.p.get(1).y, (int)triProjected.p.get(2).y};
			g.drawPolygon(xPoints, yPoints, 3);


		}

	}

	public static Vector3 MultiplyMatrixVector(Vector3 i, Mat4x4 m) {
		Vector3 o = new Vector3(i.x,i.y,i.z);
		o.x = i.x * m.m[0][0] + i.y * m.m[1][0] + i.z * m.m[2][0] + m.m[3][0];
		o.y = i.x * m.m[0][1] + i.y * m.m[1][1] + i.z * m.m[2][1] + m.m[3][1];
		o.z = i.x * m.m[0][2] + i.y * m.m[1][2] + i.z * m.m[2][2] + m.m[3][2];
		double w = i.x * m.m[0][3] + i.y * m.m[1][3] + i.z * m.m[2][3] + m.m[3][3];

		if(w != 0) {
			o.x /= w; o.y /= w; o.z/= w;
		}
		return o;
	}
}