import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.File;
import java.io.IOException;
import java.util.LinkedList;

import javax.imageio.ImageIO;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class Snake extends JFrame {
	long FPS_LIMITER = 240;

	///////////////////////////////////
	// CODE GOES HERE \/
	/////////////////////////////////

	LinkedList<Point> snake = new LinkedList<>();

	void start() {
		snake.add(new Point(15, 15));
		snake.add(new Point(15, 30));
		snake.add(new Point(30, 30));
	}

	void update() {
	}

	void draw(Graphics2D g) {
		// for each point p in snake:
		for (Point p : snake) {
			// draw a square at point p
			g.fillRect(p.x, p.y, 15, 15);
		}
	}

	/////////////////////////////////
	/////////////////////////////////
	/////////////////////////////////

	private boolean[] isKeyDown = new boolean[65536];
	private MyPanel contentPane;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		Snake frame = new Snake();
		EventQueue.invokeLater(new Runnable() {
			@Override
			public void run() {
				try {
					frame.setVisible(true);
					new Thread(frame::gameLoop).start();
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	int screenWidth() {
		return contentPane.getWidth();
	}

	int screenHeight() {
		return contentPane.getHeight();
	}

	long lt = 0, l2;

	void gameLoop() {
		l2 = System.nanoTime();
		long nsPerFrame = 1000000000l / FPS_LIMITER;
		while (true) {
			long ct = System.nanoTime();
			// update((ct - l2) / 1000000000.0);
			l2 = ct;
			if (ct - lt >= nsPerFrame) {
				lt = ct;
				update();
				contentPane.repaint();
			}
		}
	}

	/**
	 * Create the frame.
	 */
	public Snake() {
		start();

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 1000, 500);
		contentPane = new MyPanel();
		contentPane.setBorder(new EmptyBorder(0, 0, 0, 0));
		contentPane.setLayout(new BorderLayout(0, 0));
		contentPane.setDoubleBuffered(true);
		addKeyListener(new KeyListener() {

			@Override
			public void keyTyped(KeyEvent e) {

			}

			@Override
			public void keyReleased(KeyEvent e) {
				isKeyDown[e.getKeyCode()] = false;
			}

			@Override
			public void keyPressed(KeyEvent e) {
				isKeyDown[e.getKeyCode()] = true;
			}
		});
		setContentPane(contentPane);
	}

	private class MyPanel extends JPanel {
		@Override
		public void paintComponent(Graphics g) {
			g.setColor(Color.black);
			g.fillRect(0, 0, getWidth(), getHeight());
			g.setColor(Color.white);
			draw((Graphics2D) g);
		}
	}

	private static Image loadImage(String name) {
		try {
			return ImageIO.read(new File(name));
		} catch (IOException e) {
			e.printStackTrace();
			System.err.println("Error loading image. Check the following things: ");
			System.err.println(" - Your file name is wrong");
			System.err.println(" - You placed the file in the wrong place");
			System.exit(-1);
			return null;
		}
	}

	private class Sound {
		private Clip clip;

		private void load(String name) {
			// from a wave File
			File soundFile = new File(name);
			AudioInputStream audioIn;
			try {
				audioIn = AudioSystem.getAudioInputStream(soundFile);
			} catch (UnsupportedAudioFileException e) {
				e.printStackTrace();
				System.err.println("Error loading sound. Your audio file is in the wrong format:");
				System.err.println(" - It must be in .wav format");
				System.err.println(" - Please use https://convertio.co/mp3-wav/ to convert it");
				System.exit(-1);
				return;
			} catch (IOException e) {
				e.printStackTrace();
				System.err.println("Error loading sound. Check the following things: ");
				System.err.println(" - Your file name is wrong");
				System.err.println(" - You placed the file in the wrong place");
				System.exit(-1);
				return;
			}
			try {
				clip = AudioSystem.getClip();
				clip.open(audioIn);
			} catch (LineUnavailableException | IOException e) {
				e.printStackTrace();
				System.err.println("Fatal error loading sound. Rip");
				System.exit(-1);
				return;
			}
		}

		public Sound(String name) {
			load(name);
		}

		public void play() {
			stop();
			clip.setFramePosition(0);
			clip.start();
		}

		public void loop() {
			clip.loop(Clip.LOOP_CONTINUOUSLY);
		}

		public void stop() {
			clip.stop();
		}
	}

}