import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
 *  A GUI runner for your solution to the 2025 Lab
 *  Unit 4: 2048
 *  
 *  @author Chris Thiel, OFMCap
 *  @version July 15, 2025
 *  
 *  Make sure to write a getScore() method in your Game2048 class
 *  as well as a getGameBoard() method.  Alternatively,
 *  you can write your own draw(Graphics g) method, and call it
 *  from this class's paintComponent method.
 */

public class GUI2048 extends JPanel implements KeyListener
{

	private static int WIDTH = 800, HEIGHT = 800;
	private static int LEFT_ARROW = 37, UP_ARROW = 38, 
			           RIGHT_ARROW = 39, DOWN_ARROW = 40;
	private Font titleFont, regularFont;
	private int keyCode, boardSize;
	private int[][] board;
	private char c;
	String message;
	private Game2048 myGame;
	

	public GUI2048()
	{

		myGame = new Game2048();
		board = myGame.getBoard();
		boardSize = board.length;
		message = "Use arrow keys (or l, r, u, d for left, right, up, down)";
		titleFont = new Font("Roman", Font.BOLD, 18);
		regularFont = new Font("Helvetica", Font.PLAIN, 12);
		keyCode=0;
		c='-';
	}
	public static void main(String[] args) {
		GUI2048 app= new GUI2048();
		JFrame window = new JFrame("2048 Game");
		window.setSize(WIDTH, HEIGHT);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		window.getContentPane().add(app);
		window.addKeyListener(app);
		window.setVisible(true);

	}
	public void paintComponent(Graphics g){
		super.paintComponent(g);
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, getWidth(),getHeight());
		g.setColor(Color.BLUE);
		
		g.setFont(new Font("Arial", Font.PLAIN, 48));
		g.drawString("2048 Game", WIDTH/3, 40);
		g.setFont(titleFont);
		g.setColor(Color.BLACK);
		g.drawString("Score: " + myGame.getScore(), 4*WIDTH/5, 40);
		g.drawString( message , 20, WIDTH - 50);

		g.setFont(regularFont);
		g.drawString("Version 1.0", 20, 50);
		g.setFont(new Font("Arial", Font.PLAIN, 48));
		g.setColor(Color.red);
		drawBoard(g);


	}
	
	public void drawBoard(Graphics g) {
		int size = HEIGHT/(boardSize +1);
		int top = 60;
		int left = WIDTH/2 - 2 * size;
		g.setFont(new Font("Arial", Font.BOLD, 48));
		for(int r = 0; r < boardSize; r++)
			for(int c = 0; c < boardSize; c++)
			{
				if (board[r][c] != 0)
					g.drawString (""+board[r][c], left+c*size + size/3, 
							                      top + r*size + 3*size/4);
			}
		g.setColor(Color.BLACK);
		for(int r = 0; r <= boardSize; r++) {
			g.drawLine(left, top + size*r, left + boardSize*size, top +size*r);
		}

		for(int c = 0; c <= boardSize; c++){
			g.drawLine(left+c*size, top ,left+c*size, top + boardSize* size);
		}
	}

	// These 3 methods need to be declared to implement the KeyListener Interface
	@Override
	public void keyTyped(KeyEvent e) {}

	@Override
	public void keyPressed(KeyEvent e) 
	{
		keyCode=e.getKeyCode();
		c=e.getKeyChar();
		if (keyCode == LEFT_ARROW || c == 'l')
		{
			myGame.moveLeft();
			myGame.mergeLeft();
			myGame.moveLeft();
			message = "left";
		} 
		else if (keyCode == RIGHT_ARROW || c == 'r')
		{
			myGame.moveRight();
			myGame.mergeRight();
			myGame.moveRight();
			message = "right";
		} 
		else if (keyCode == UP_ARROW || c == 'u')
		{
			myGame.moveUp();
			myGame.mergeUp();
			myGame.moveUp();
			message = "up";
		} 
		else if (keyCode == DOWN_ARROW || c == 'd' ) 
		{
			myGame.moveDown();
			myGame.mergeDown();
			myGame.moveDown();
			message = "down";
		} 
		else 
		{
			message = c+ " is an invalid choice!";
			
		}
		if (message.length() < 6 && !myGame.gameOver())
			myGame.add2ToBoard();
		if (myGame.gameOver())
			message = "Game Over - You reached "+ myGame.max();
		repaint();
	}

	@Override
	public void keyReleased(KeyEvent e) {}

}