package com.eusurto.main;



import javax.swing.*;

import com.eusurto.entities.Entity;

import java.awt.*;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.util.ArrayList;

public class Game extends Canvas implements Runnable{

	private static final long serialVersionUID = 1L;
    public static JFrame frame;
    private Thread thread;
    private BufferedImage image;
    private final int WIDTH = 160;
    private final int HEIGHT = 120;
    private final int SCALE = 3;

    private boolean isRunning = true;

    public List<Entity> entities;
    public Spritesheet spritesheet;

    public Game(){

        setPreferredSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
        initFrame();
        //inicializando objetos
        image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
        entities = new ArrayList<Entity>();
        spritesheet = new Spritesheet("/spritesheet");
    }

    public void initFrame(){
        frame = new JFrame("Game #1");
        frame.add(this);
        frame.setResizable(false);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public synchronized void start(){
        thread = new Thread(this);
        isRunning = true;
        thread.start();
    }

    public synchronized void stop(){
        isRunning = false;
        try{
            thread.join();
        }catch (InterruptedException e){
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Game game = new Game();
        game.start();
    }

    public void tick(){
		for(int i = 0; i < entities.size(); i++) {
			Entity e = entities.get(i);
			e.tick();
    }

    public void render(){
        BufferStrategy bs = this.getBufferStrategy();
        if(bs == null){
            this.createBufferStrategy(3);
            return;
        }

        Graphics g = image.getGraphics();
        g.setColor(new Color(0, 0, 0));
        g.fillRect(0, 0, WIDTH, HEIGHT);
		for(int i = 0; i < entities.size(); i++) {
			Entity e = entities.get(i);
			e.render();
        g.dispose();
        g = bs.getDrawGraphics();
        g.drawImage(image, 0, 0, WIDTH * SCALE, HEIGHT * SCALE, null);
        bs.show();
    }

    public void run() {
        long lastTime = System.nanoTime();
        double amountOfTicks = 60.0;
        double ns = 1000000000 / amountOfTicks;
        double delta = 0;
        int frames = 0;
        double timer = System.currentTimeMillis();
        while(isRunning){
            long now = System.nanoTime();
            delta += (now - lastTime) / ns;
            lastTime = now;
            if(delta >= 1){
                tick();
                render();
                frames++;
                delta--;
            }
            if(System.currentTimeMillis() - timer >= 1000){
                System.out.println("FPR: " + frames);
                frames = 0;
                timer += 1000;
            }
        }
        stop();
    }
}