package snake;

import java.awt.*;
import java.applet.*;
import javax.swing.ImageIcon;
import javax.swing.JLabel;

public class Snake extends Applet implements Runnable
{
    Image dot[] = new Image[400];
    Image offI;
    
    Graphics offG;

    int x[] = new int[400];
    int y[] = new int[400];
    int rtemp = 1;
    int speed;
    int z;
    int n;
    int score = 0;
    int delay = -1;
    
    String directory = System.getProperty("user.dir");

    Button easy = new Button("Easy");
    Button medium = new Button("Medium");
    Button hard = new Button("Hard");

    JLabel dif;

    ImageIcon difImage = new ImageIcon(directory+"\\images\\difImage.png");

    String direction;

    boolean go[] = new boolean[400];
    boolean isPaused = true;
    boolean gameOver = true;

    Thread setTime;

    Panel buttons;

    public void init()
    {
        setSize(500, 500);
        setBackground(new Color(50,200,50));

        buttons = new Panel();
        buttons.setLayout(new GridLayout(4,1,50,50));
        buttons.setBackground(new Color(50,200,50));
        dif = new JLabel(difImage);
        buttons.add(dif);
        buttons.add(easy);
        buttons.add(medium);
        buttons.add(hard);

        
        add(buttons);

        for (z=0 ; z < 400 ; z++)
        {
            dot[z] = Toolkit.getDefaultToolkit().getImage(directory+"\\images\\dot.png");
        }
    }

    public void update(Graphics g)
    {
        Dimension d = this.size();
        if(offI == null)
        {
            offI = createImage(d.width, d.height);
            offG = offI.getGraphics();
        }
        offG.clearRect(0, 0, d.width, d.height);
        paint(offG);
        g.drawImage(offI, 0, 0, null);
        delay--;
    }

    public void paint(Graphics g)
    {
        g.setColor(Color.black);

        if(!isPaused)
        {
            g.setFont(new Font("Verdana", 1, 28));
            g.setColor(Color.BLACK);
            String scoreString = "Score "+score+"";
            g.drawString(scoreString, 320, 495);
            String line = "-------------------------------------------------";
            g.drawString(line, -5,465);
        }

        if(!gameOver)
        {
            for (z=0; z<=n; z++)
            {
                g.drawImage(dot[z],x[z],y[z],this);
            }
        }

    }

    public void run()
    {
        for(z=4; z<400; z++)
        {
            go[z]=false;
        }
        for(z=0; z<4; z++)
        {
            go[z]=true;
            x[z]=91;
            y[z]=91;
        }
        n=3;
        score=0;
        buttons.move(600, 600);
        direction = "";
        locateRandom(4);

        while(true)
        {
            if (!isPaused)
            {
                if ((x[0]==x[n]) && (y[0]==y[n]))
                {
                    go[n]=true;
                    locateRandom((n+1));
                    score+=10;
                }
                for(z=399 ; z>0 ; z--)
                {
                    if (go[z])
                    {
                        x[z] = x[(z-1)];
                        y[z] = y[(z-1)];
                        if ((z>4)&&(x[0]==x[z]) && (y[0]==y[z]))
                        {
                            gameOver = true;
                            gameOver();
                        }
                    }
                }
                if(direction.equals("left"))
                {
                    x[0]-=10;
                }
                if(direction.equals("right"))
                {
                    x[0]+=10;
                }
                if(direction.equals("up"))
                {
                    y[0]-=10;
                }
                if(direction.equals("down"))
                {
                    y[0]+=10;
                }
            }

            if(y[0]>450 && !gameOver)
            {
                y[0]=500;
                gameOver=true;
                gameOver();
                break;
            }
            if(y[0]<1 && !gameOver)
            {
                y[0]=1;
                gameOver=true;
                gameOver();
                break;
            }
            if(x[0]>500 && !gameOver)
            {
                x[0]=500;
                gameOver=true;
                gameOver();
                break;
            }
            if(x[0]<1 && !gameOver)
            {
                x[0]=1;
                gameOver=true;
                gameOver();
                break;
            }

        repaint();
        try
        {
            setTime.sleep(speed);
        }
        catch(InterruptedException e){}
        }
    }

    public void locateRandom(int turn)
    {
        rtemp=(int)(Math.random()*50);
        x[turn]=((rtemp*10)+1) ;
        rtemp=(int)(Math.random()*40);
        y[turn]=((rtemp*10)+1);
        n++;
    }

    public boolean keyDown(Event e, int key)
    {
        if(delay<0)
        {
            if (key == Event.LEFT && !gameOver && !isPaused)
            {
                if(!direction.equals("right"))
                {
                    direction="left";
                    delay=1;
                }
                isPaused = false;
            }
            if (key == Event.RIGHT && !gameOver && !isPaused)
            {
                if(!direction.equals("left"))
                {
                    direction="right";
                    delay=1;
                }
                isPaused = false;
            }
            if (key == Event.UP && !gameOver && !isPaused)
            {
                if(!direction.equals("down"))
                {
                    direction="up";
                    delay=1;
                }
                isPaused = false;
            }
            if (key == Event.DOWN && !gameOver && !isPaused)
            {
                if(!direction.equals("up"))
                {
                    direction="down";
                    delay=1;
                }
                isPaused = false;
            }
            if(key == Event.ENTER && !gameOver)
            {
                if(isPaused)
                {
                    isPaused = false;
                }
                else
                {
                    isPaused = true;
                }
                direction="";
            }
            return true;
        }
        return true;
    }

    public boolean action(Event event, Object obj)
    {
        String difficulty = (String) obj;

        if(difficulty.equals("Easy"))
        {
            speed=60;
            isPaused = false;
            gameOver = false;
            buttons.move(0,0);
            setTime = new Thread(this);
            setTime.start();
            return true;
        }

        if(difficulty.equals("Medium"))
        {
            speed=35;
            isPaused = false;
            gameOver = false;
            buttons.move(0,0);
            setTime = new Thread(this);
            setTime.start();
            return true;
        }

        if(difficulty.equals("Hard"))
        {
            speed=10;
            isPaused = false;
            gameOver = false;
            buttons.move(0,0);
            setTime = new Thread(this);
            setTime.start();
            return true;
        }
        return false;
    }
    public void gameOver()
    {
        if(gameOver)
        {
            direction = "";
            isPaused = true;
            buttons.move(175,5);
            gameOver = false;
            isPaused = true;
            setTime.stop();
        }
    }
}