import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.Timer;

/**
 * Class Pong untuk membuat opsi permainan, bot,
 * score, dan pengaturan dasar game.
 *
 * @author Naufaliando
 * @version 14/12/2020
 */

public class Pong implements ActionListener, KeyListener
{
    public static Pong pong;
    public int width = 700, height = 700;
    public Renderer renderer;
    public Paddle player1;
    public Paddle player2;
    public Ball ball;
    public boolean bot = false, selectingDifficulty;
    public boolean w, s, up, down;
    public int gameStatus = 0, scoreLimit = 7, playerWon; //0 = Menu, 1 = Paused, 2 = Playing, 3 = Over
    public int botDifficulty, botMoves, botCooldown = 0;
    public Random random;
    public JFrame jframe;

    public Pong()
    {
        Timer timer = new Timer(20, this);
        random = new Random();

        jframe = new JFrame("Pong");

        renderer = new Renderer();

        jframe.setSize(width + 15, height + 35);
        jframe.setVisible(true);
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jframe.add(renderer);
        jframe.addKeyListener(this);

        timer.start();
    }

    public void start()
    {
        gameStatus = 2;
        player1 = new Paddle(this, 1);
        player2 = new Paddle(this, 2);
        ball = new Ball(this);
    }

    public void update()
    {
        if (player1.score >= scoreLimit)
        {
            playerWon = 1;
            gameStatus = 3;
        }

        if (player2.score >= scoreLimit)
        {
            gameStatus = 3;
            playerWon = 2;
        }

        if (w)
        {
            player1.move(true);
        }
        if (s)
        {
            player1.move(false);
        }

        if (!bot)
        {
            if (up)
            {
                player2.move(true);
            }
            if (down)
            {
                player2.move(false);
            }
        }
        else
        {
            if (botCooldown > 0)
            {
                botCooldown--;

                if (botCooldown == 0)
                {
                    botMoves = 0;
                }
            }

            if (botMoves < 10)
            {
                if (player2.y + player2.height / 2 < ball.y)
                {
                    player2.move(false);
                    botMoves++;
                }

                if (player2.y + player2.height / 2 > ball.y)
                {
                    player2.move(true);
                    botMoves++;
                }

                if (botDifficulty == 0)
                {
                    botCooldown = 20;
                }
                if (botDifficulty == 1)
                {
                    botCooldown = 15;
                }
                if (botDifficulty == 2)
                {
                    botCooldown = 10;
                }
            }
        }

        ball.update(player1, player2);
    }

    public void render(Graphics2D g)
    {
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, width, height);
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        if (gameStatus == 0)
        {
            g.setColor(Color.WHITE);
            g.setFont(new Font("Arial", 1, 50));

            g.drawString("PONG", width / 2 - 75, 50);

            if (!selectingDifficulty)
            {
                g.setFont(new Font("Arial", 1, 30));

                g.drawString("Press Space to Play", width / 2 - 150, height / 2 - 25);
                g.drawString("Press Shift to Play with Bot", width / 2 - 200, height / 2 + 25);
                g.drawString("<< Score Limit: " + scoreLimit + " >>", width / 2 - 150, height / 2 + 75);
            }
        }

        if (selectingDifficulty)
        {
            String string = botDifficulty == 0 ? "Easy" : (botDifficulty == 1 ? "Medium" : "Hard");

            g.setFont(new Font("Arial", 1, 30));

            g.drawString("<< Bot Difficulty: " + string + " >>", width / 2 - 180, height / 2 - 25);
            g.drawString("Press Space to Play", width / 2 - 150, height / 2 + 25);
        }

        if (gameStatus == 1)
        {
            g.setColor(Color.WHITE);
            g.setFont(new Font("Arial", 1, 50));
            g.drawString("PAUSED", width / 2 - 103, height / 2 - 25);
        }

        if (gameStatus == 1 || gameStatus == 2)
        {
            g.setColor(Color.WHITE);

            g.setStroke(new BasicStroke(5f));

            g.drawLine(width / 2, 0, width / 2, height);

            g.setStroke(new BasicStroke(2f));

            g.drawOval(width / 2 - 150, height / 2 - 150, 300, 300);

            g.setFont(new Font("Arial", 1, 50));

            g.drawString(String.valueOf(player1.score), width / 2 - 90, 50);
            g.drawString(String.valueOf(player2.score), width / 2 + 65, 50);

            player1.render(g);
            player2.render(g);
            ball.render(g);
        }

        if (gameStatus == 3)
        {
            g.setColor(Color.WHITE);
            g.setFont(new Font("Arial", 1, 50));

            g.drawString("PONG", width / 2 - 75, 50);

            if (bot && playerWon == 2)
            {
                g.drawString("The Bot Wins!", width / 2 - 170, 200);
            }
            else
            {
                g.drawString("Player " + playerWon + " Wins!", width / 2 - 165, 200);
            }

            g.setFont(new Font("Arial", 1, 30));

            g.drawString("Press Space to Play Again", width / 2 - 185, height / 2 - 25);
            g.drawString("Press ESC for Menu", width / 2 - 140, height / 2 + 25);
        }
    }

    @Override
    public void actionPerformed(ActionEvent e)
    {
        if (gameStatus == 2)
        {
            update();
        }

        renderer.repaint();
    }

    public static void main(String[] args)
    {
        pong = new Pong();
    }

    @Override
    public void keyPressed(KeyEvent e)
    {
        int id = e.getKeyCode();

        if (id == KeyEvent.VK_W)
        {
            w = true;
        }
        else if (id == KeyEvent.VK_S)
        {
            s = true;
        }
        else if (id == KeyEvent.VK_UP)
        {
            up = true;
        }
        else if (id == KeyEvent.VK_DOWN)
        {
            down = true;
        }
        else if (id == KeyEvent.VK_RIGHT)
        {
            if (selectingDifficulty)
            {
                if (botDifficulty < 2)
                {
                    botDifficulty++;
                }
                else
                {
                    botDifficulty = 0;
                }
            }
            else if (gameStatus == 0)
            {
                scoreLimit++;
            }
        }
        else if (id == KeyEvent.VK_LEFT)
        {
            if (selectingDifficulty)
            {
                if (botDifficulty > 0)
                {
                    botDifficulty--;
                }
                else
                {
                    botDifficulty = 2;
                }
            }
            else if (gameStatus == 0 && scoreLimit > 1)
            {
                scoreLimit--;
            }
        }
        else if (id == KeyEvent.VK_ESCAPE && (gameStatus == 2 || gameStatus == 3))
        {
            gameStatus = 0;
        }
        else if (id == KeyEvent.VK_SHIFT && gameStatus == 0)
        {
            bot = true;
            selectingDifficulty = true;
        }
        else if (id == KeyEvent.VK_SPACE)
        {
            if (gameStatus == 0 || gameStatus == 3)
            {
                if (!selectingDifficulty)
                {
                    bot = false;
                }
                else
                {
                    selectingDifficulty = false;
                }

                start();
            }
            else if (gameStatus == 1)
            {
                gameStatus = 2;
            }
            else if (gameStatus == 2)
            {
                gameStatus = 1;
            }
        }
    }

    @Override
    public void keyReleased(KeyEvent e)
    {
        int id = e.getKeyCode();

        if (id == KeyEvent.VK_W)
        {
            w = false;
        }
        else if (id == KeyEvent.VK_S)
        {
            s = false;
        }
        else if (id == KeyEvent.VK_UP)
        {
            up = false;
        }
        else if (id == KeyEvent.VK_DOWN)
        {
            down = false;
        }
    }

    @Override
    public void keyTyped(KeyEvent e)
    {

    }
}