import java.applet.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

//we need the applet methods and the MouseMotionListener interface
//(used for the human controlled paddle)

public class snakeMain extends Applet implements KeyListener,
ActionListener
{
    // a font used to display the score
    Font newFont = new Font("sansserif", Font.BOLD, 20);
    //The image is going to be double buffered to avoid flicker
    Graphics bufferGraphics;
    //the Image will contain everything drawn on bufferGraphics
    Image offscreen;
    //variables used to set the width and height of the applet
    final int WIDTH = 500, HEIGHT = 500, BORDER = 100, GRIDSIZE = 10, INITIALLENGTH = 3, INITIALSNAKEX = 5, INITIALSNAKEY = 5;

    private boolean gameOver = false;
    private int snakeLength = INITIALLENGTH;
    private int snakeX = INITIALSNAKEX, snakeY = INITIALSNAKEY;
    private int snakeUpDown = -1, snakeLeftRight = 0;
    private int frameCounter = 0;
    //declare the array
    int[][] grid = new int[GRIDSIZE][GRIDSIZE];

    //I am going to use a timer to do a certain list of tasks
    //every 15 milliseconds (67 FPS)
    Timer time = new Timer(15, this);

    public void init()
    {
        //set the applet to be 500*300
        setSize(WIDTH, HEIGHT);

        gameOver = false;
        grid[snakeY][snakeX] = snakeLength;

        //mouseMotionListener allows the player to control their paddle
        addKeyListener(this);
        setBackground(Color.black);

        //create offscreen image to draw on
        offscreen = createImage(WIDTH, HEIGHT);
        bufferGraphics = offscreen.getGraphics();

        //this is the game loop
        time.start();

    }

    //every 15 milliseconds the timer triggers the actionPerformed method
    public void actionPerformed(ActionEvent arg0)
    {
        if(gameOver == true)
        {
            //after the game needs to end we stop the timer,
            time.stop();
            repaint();
        }
        else
        {
            frameCounter = frameCounter + 1;

            if (frameCounter == 10)
            {

                snakeX = snakeX + snakeLeftRight;
                snakeY = snakeY + snakeUpDown;

                if (snakeX < 0)
                {
                    snakeX = GRIDSIZE;
                }

                if (snakeX > GRIDSIZE)
                {
                    snakeX = 0;
                }

                if (snakeY < 0)
                {
                    snakeY = GRIDSIZE;
                }

                if (snakeY > GRIDSIZE)
                {
                    snakeY = 0;
                }

                for (int i = 0; i <= GRIDSIZE; i++)
                {
                    for (int j = 0; j <= GRIDSIZE; j++)
                    {
                        if (grid[i][j] > 0)
                        {
                            grid[i][j]--;
                        }
                    }
                }

                grid[snakeY][snakeX] = snakeLength;

                frameCounter = 0;

            }
            else
            {

            }
            //repaints the applet
            repaint();
        }
    }

    public void checkCollision()
    {
    }


    public void paint(Graphics g)
    {
        // first clear off the image
        bufferGraphics.clearRect(0,0,WIDTH,HEIGHT);

        //Now draw the snake in white
        bufferGraphics.setColor(Color.white);

        //placeholder to test graphics
        bufferGraphics.fillRect(10,10,100,100);
        bufferGraphics.drawString(" " + frameCounter, 150, 15);

        for (int i = 0; i <= GRIDSIZE; i++)
          {
              for (int j = 0; j <= GRIDSIZE; j++)
              {
                   if(grid[i][j] > 0)
                   {
                       bufferGraphics.fillRect(((i*10) + BORDER),((j*10) + BORDER),10,10);
                   }
              }
          }

        //finally draw the offscreen image to the applet
        g.drawImage(offscreen,0,0,this);

        //this line makes sure all the monitors are up to date before proceeding
        Toolkit.getDefaultToolkit().sync();
    }

    public void update(Graphics g)
    {
        paint(g);
    }

    public void keyPressed(KeyEvent e)
    {

    }

    public void keyTyped(KeyEvent e)
    {
        //this is placeholder
    }

    public void keyReleased(KeyEvent e)
    {
        //this is placeholder
    }


}