package com.thecherno.rain;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.util.Random;

import javax.swing.JFrame;

import com.thecherno.rain.graphics.Screen;
import com.thecherno.rain.input.Keyboard;
import com.thecherno.rain.level.Level;
import com.thecherno.rain.level.RandomLevel;

public class Game extends Canvas implements Runnable {
	private static final long serialVersionUID = 1L;

	public static int width = 300;             //width of screen
	public static int height = width / 16 * 9; //height of the screen based on 9/16 ratio
	public static int scale = 3;               //scale
	public static String title = "Rain";

	private Thread thread;                    // basically a thread is .exe sub-program
	private JFrame frame;
	private Keyboard key;
	private Level level;
	private boolean running = false;          // helps keep program open see line 28 for more

	private Screen screen;

	private BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  //create an image
	private int[] pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData();      // accessing the previously created image

	public Game() {
		Dimension size = new Dimension(width * scale, height * scale);     // sets the display screen by giving the screen dimensions
	    setPreferredSize(size);           //sets the dimensions size in line above to the size of the game screen

	    screen = new Screen(width, height); // sets screen (the integer )to width and heing
	    frame = new JFrame();
	    key = new Keyboard();
	    level = new RandomLevel(64, 64);



	    addKeyListener(key); // checks for keys and applies them and connects the keyboard class integer keyboard update
	}

	public synchronized void start () {
		running = true ;                        // sets running equal to true so a while will run and keep java from closing when the program is done running all exucutions
		thread = new Thread (this, "Display"); //creates a thread in this class
		thread.start();	 			                      // starts the newly created thread
	}

	public synchronized void stop () {   	//safely stops the thread
	    running = false;                    //sets running false so the program will be able to close
		try {
		thread.join();
		} catch(InterruptedException e) {
			e.printStackTrace();
		}
	}
	public void run() {
		 long lastTime = System.nanoTime();   //creating a timer variable
		 long timer = System.currentTimeMillis();
	     final double ns = 1000000000.0 / 60.0; // converts nanoseconds to milliseconds
		 double delta = 0;
         int frames = 0;
         int updates = 0;
	     requestFocus();
         while (running) {                  //as long as running is equal to true the program will run this while loop see line 10 for more
	         long now = System.nanoTime();   // everything in the next 4 lines will be just creating a timer
	         delta += (now-lastTime) / ns;
	         lastTime = now;
	         while (delta >=1) {
	              update();                     //updates the screen at a certain FPS
                  updates ++;          //   keeps track of how many times update has happened
	              delta--;
	         }
	         render();                     //puts the render, everything graphical into the backup but does not display right awa
	         frames++;                // keeps track of how many time the render has happened

	         if (System.currentTimeMillis() - timer > 1000) {         //adds 1 second every time while delta is complete
	        	 timer += 1000;
	        	   System.out.println(updates + "ups, " + frames + " fps"); // displays fps
	        	   frame.setTitle(title + "  |   " + updates + "ups, " + frames + " fps" );
	        	   updates = 0;
	        	   frames = 0;
	         }

	     }
	     stop();
    }

	int x = 0, y = 0;

	public void update() {                     // just creates the update void
		 key.update();
		 if (key.up) y++;
		 if (key.down) y--;
		 if (key.left) x++;
		 if (key.right) x--;

	}

	public void render() {                   // creates the render void which holds all graphical information
		BufferStrategy bs = getBufferStrategy();       // renders backup screens to come
		if(bs == null) {                              // limits backup to hold a certain amount
			createBufferStrategy(3);                  // limits backup to hold 3 backup screens
			return;                                    // returns back to the start of the program
		}
		screen.clear();              //clears everything on the screen right befor the next rendering happens
		level.render(x, y, screen);

		for (int i = 0; i < pixels.length; i++) {    // just do it because
			pixels[i] = screen.pixels[i];            // sets the game class pixel arrays equal to the screen class pixel arrays
		}
		Graphics g = bs.getDrawGraphics();
		g.fillRect(0, 0, getWidth(), getHeight());       // builds a rectangle the size of the program window with the color as the previously set color
	    g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
		g.dispose();
		bs.show();

	}

	public static void main (String[] args) {       //starts the game // where the main programming is // execution for the game happens here
		Game game = new Game();              // allows all integers in the game class into this one section
		game.frame.setResizable(false);         // restricts screen resizing
		game.frame.setTitle(Game.title);       //REMEMBER THIS SETS THE TITLE NAME ON THE PROGRAM BOX
		game.frame.add(game);            // adds all Game class stuff into this component
		game.frame.pack();                // resizes this component to the same size as public game
		game.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    //stops this component when you exit off of the program
		game.frame.setLocationRelativeTo(null);       //sets the program window to run right in the middle of the screen
		game.frame.setVisible(true);                        //makes the program window visible on the screen

		game.start();                       // starts the game
	}

	}