import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.util.glu.GLU.*;

import java.io.IOException;
import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;

/**
 * @author jediTofu
 * @see <a href="http://lwjgl.org/">LWJGL Home Page</a>
 */
public class Main {
  public static final int DISPLAY_HEIGHT = 480;
  public static final int DISPLAY_WIDTH = 640;
  public static final Logger LOGGER = Logger.getLogger(Main.class.getName());

  private int squareSize;
  private int squareX;
  private int squareY;
  private int squareZ;

  static {
    try {
      LOGGER.addHandler(new FileHandler("errors.log",true));
    }
    catch(IOException ex) {
      LOGGER.log(Level.WARNING,ex.toString(),ex);
    }
  }

  public static void main(String[] args) {
    Main main = null;
    try {
      System.out.println("Keys:");
      System.out.println("down  - Shrink");
      System.out.println("up    - Grow");
      System.out.println("left  - Rotate left");
      System.out.println("right - Rotate right");
      System.out.println("esc   - Exit");
      main = new Main();
      main.create();
      main.run();
    }
    catch(Exception ex) {
      LOGGER.log(Level.SEVERE,ex.toString(),ex);
    }
    finally {
      if(main != null) {
        main.destroy();
      }
    }
  }

  public Main() {
    squareSize = 100;
    squareX = 0;
    squareY = 0;
    squareZ = 0;
  }

  public void create() throws LWJGLException {
    //Display
    Display.setDisplayMode(new DisplayMode(DISPLAY_WIDTH,DISPLAY_HEIGHT));
    Display.setFullscreen(false);
    Display.setTitle("Hello LWJGL World!");
    Display.create();

    //Keyboard
    Keyboard.create();

    //Mouse
    Mouse.setGrabbed(false);
    Mouse.create();

    //OpenGL
    initGL();
    resizeGL();
  }

  public void destroy() {
    //Methods already check if created before destroying.
    Mouse.destroy();
    Keyboard.destroy();
    Display.destroy();
  }

  public void initGL() {
    //2D Initialization
    glClearColor(0.0f,0.0f,0.0f,0.0f);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_LIGHTING);
  }

  public void processKeyboard() {
    //Square's Size
    if(Keyboard.isKeyDown(Keyboard.KEY_DOWN)) {
      --squareSize;
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_UP)) {
      ++squareSize;
    }

    //Square's Z
    if(Keyboard.isKeyDown(Keyboard.KEY_LEFT)) {
      ++squareZ;
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) {
      --squareZ;
    }

    //Testing
    if(Keyboard.isKeyDown(Keyboard.KEY_LSHIFT)) {
      System.out.println("Key LSHIFT");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_1)) {
      System.out.println("Key 1");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_2)) {
      System.out.println("Key 2");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_3)) {
      System.out.println("Key 3");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_4)) {
      System.out.println("Key 4");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_5)) {
      System.out.println("Key 5");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_6)) {
      System.out.println("Key 6");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_7)) {
      System.out.println("Key 7");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_8)) {
      System.out.println("Key 8");
    }
    if(Keyboard.isKeyDown(Keyboard.KEY_9)) {
      System.out.println("Key 9");
    }


  }

  public void processMouse() {
    squareX = Mouse.getX();
    squareY = Mouse.getY();
  }

  public void render() {
    glClear(GL_COLOR_BUFFER_BIT);
    glLoadIdentity();

    //Draw a basic square
    glTranslatef(squareX,squareY,0.0f);
    glRotatef(squareZ,0.0f,0.0f,1.0f);
    glTranslatef(-(squareSize >> 1),-(squareSize >> 1),0.0f);
    glColor3f(0.0f,0.5f,0.5f);
    glBegin(GL_QUADS);
      glTexCoord2f(0.0f,0.0f); glVertex2f(0.0f,0.0f);
      glTexCoord2f(1.0f,0.0f); glVertex2f(squareSize,0.0f);
      glTexCoord2f(1.0f,1.0f); glVertex2f(squareSize,squareSize);
      glTexCoord2f(0.0f,1.0f); glVertex2f(0.0f,squareSize);
    glEnd();
  }

  public void resizeGL() {
    //2D Scene
    glViewport(0,0,DISPLAY_WIDTH,DISPLAY_HEIGHT);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0f,DISPLAY_WIDTH,0.0f,DISPLAY_HEIGHT);
    glPushMatrix();

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glPushMatrix();
  }

  public void run() {
    while(!Display.isCloseRequested() && !Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) {
      if(Display.isVisible()) {
        processKeyboard();
        processMouse();
        update();
        render();
      }
      else {
        if(Display.isDirty()) {
          render();
        }
        try {
          Thread.sleep(100);
        }
        catch(InterruptedException ex) {
        }
      }
      Display.update();
      Display.sync(30);
    }
  }

  public void update() {
    if(squareSize < 5) {
      squareSize = 5;
    }
    else if(squareSize >= DISPLAY_HEIGHT) {
      squareSize = DISPLAY_HEIGHT;
    }
  }
}