import javax.swing.*;
import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

/**
 * Created by Nivesh Varma on 07 Mar 17.
 */
public class NekoTheCat implements MouseListener, Runnable{

    Image catRight1 = new ImageIcon(getClass().getResource("Neko1.gif")).getImage();
    Image catRight2 = new ImageIcon(getClass().getResource("Neko2.gif")).getImage();
    Image catLeft1  = new ImageIcon(getClass().getResource("Neko3.gif")).getImage();
    Image catLeft2  = new ImageIcon(getClass().getResource("Neko4.gif")).getImage();
    Image redBall   = new ImageIcon(getClass().getResource("red-ball.gif")).getImage();

    Image cat1 = catRight1;
    Image cat2 = catRight2;
    Image currentImage = catRight1;

    JFrame gameWindow = new JFrame("Neko The Cat!");
    JPanel gamePanel  = new JPanel();

    int     catxPosition  = 1;
    int     catyPosition  = 50;
    int     catWidth      = catRight1.getWidth(gamePanel);
    int     catHeight     = catRight1.getHeight(gamePanel);
    int     ballxPosition = 0;
    int     ballyPosition = 0;
    int     ballSize      = redBall.getWidth(gamePanel);
    int     sleepTime     = 100; // pause time between image repaints (in ms)
    int     xBump         = 10;  // amount cat image is moved each repaint.
    int     yBump         = 10;  // y shift change
    boolean catIsRunningToTheRight = true; // initially
    boolean catIsRunningToTheLeft  = false;// initially
    boolean ballHasBeenPlaced      = false;// initially

    Graphics g;

    AudioClip soundFile = Applet.newAudioClip(getClass().getResource("spacemusic.au"));

    //constructor
    public NekoTheCat() {
        //get ready
        gameWindow.getContentPane().add(gamePanel, "Center");
        gamePanel.setBackground(Color.white);
        gameWindow.setSize(960,540);
        gameWindow.setVisible(true);
        gameWindow.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        g = gamePanel.getGraphics();
        // show game instructions on the screen
        g.setFont(new Font("Arial", Font.BOLD, 20));
        g.drawString("Neko the cat is looking for it's red ball!"         ,100,100);
        g.drawString("Click the mouse to place Neko's ball."              ,100,120);
        g.drawString("Can you move the ball to keep Neko from getting it?",100,140);
        g.drawString("(Pull window larger to make the game easier)"       ,100,160);

        gamePanel.addMouseListener(this); //call me!

        soundFile.loop();
    }

    //main
    public static void main(String args[]) {
        NekoTheCat Nyan = new NekoTheCat();
        Nyan.run();
    }

    @Override
    public void mouseClicked(MouseEvent me) {
        g.setColor(Color.white); // set to background color
        g.fillRect(ballxPosition, ballyPosition, ballSize, ballSize); //x,y,width,height

        ballxPosition = me.getX();
        ballyPosition = me.getY();
        g.drawImage(redBall,ballxPosition,ballyPosition,gamePanel); //draw ball at new click point

//        System.out.println("Mouse clicked at x=" + ballxPosition + ", y=" + ballyPosition);

        ballHasBeenPlaced = true;

    }

    @Override
    public void mousePressed(MouseEvent e) {

    }

    @Override
    public void mouseReleased(MouseEvent e) {

    }

    @Override
    public void mouseEntered(MouseEvent e) {

    }

    @Override
    public void mouseExited(MouseEvent e) {

    }

    @Override
    public void run() {
        System.out.println("thread has entered run");
//        g.drawImage(catRight1,0,0,gamePanel);//imageName,x coordinate,y coordinate,where to draw
//        g.drawImage(catRight2,1*catWidth,0,gamePanel);
//        g.drawImage(catLeft1, 2*catWidth,0,gamePanel);
//        g.drawImage(catLeft2, 3*catWidth,0,gamePanel);
//        g.drawImage(redBall,  4*catWidth,0,gamePanel);
        while (true) {
            while ((catxPosition > 0) &&  (catxPosition < gamePanel.getSize().width))
            {
                // run Neko!
                // 1. Blank out the last image
                g.setColor(Color.white); // set to background color
                g.fillRect(catxPosition, catyPosition, ballSize, ballSize); //x,y,width,height

                // 2. Bump the location for the new image
                catxPosition += xBump;

                // 3. Select the next image.
                if (currentImage == cat1) currentImage = cat2;
                else currentImage = cat1;

                // 4. Draw the next cat image
                g.drawImage(currentImage,catxPosition,catyPosition,gamePanel); //draw ball at new click point

                // 5. Pause briefly to let human eye see the new image!
                try {Thread.sleep(sleepTime);}
                catch(InterruptedException ie){}

                // 6. If necessary, redirect the cat toward the ball.
                if (ballHasBeenPlaced) // first ensure that the ball is "in play"
                {
                    // If cat is BELOW the ball
                    // then move cat up 1 line.
                    if (catyPosition > ballyPosition) catyPosition -= yBump;

                    // If cat is ABOVE the ball
                    // then move cat down one line.
                    if (catyPosition < ballyPosition) catyPosition += yBump;

                    // If the cat is running to the left
                    // and the ball is to the right of the cat
                    if (catIsRunningToTheLeft && (ballxPosition > catxPosition))
                        reverseDirectionFromLeftToRight();

                    // If the cat is running to the right
                    // and the ball is to the left of the cat
                    if (catIsRunningToTheRight && (ballxPosition < catxPosition))
                        reverseDirectionFromRightToLeft();
                }

                // 7. Proximity test to see if Neko is "at" the ball.
                if ((Math.abs(catyPosition - ballyPosition) < 10)   // y within 10
                        && (Math.abs(catxPosition - ballxPosition) < 10))  // x within 10 pixels
                {
                    // Take Neko-got-the-ball action!
                    gamePanel.removeMouseListener(this);
                    g.setColor(Color.red);
                    g.setFont(new Font("Arial", Font.BOLD, 50));
                    g.drawString("At last, I have my ball!",50,50);
                    soundFile.stop();
                    return;
                }
            }
            // turn Neko around.
            if (catxPosition > gamePanel.getSize().width)
            {
                reverseDirectionFromRightToLeft();
                catxPosition = gamePanel.getSize().width -1;
            }

            if (catxPosition < 0)
            {
                reverseDirectionFromLeftToRight();
                catxPosition = 1;
            }
        } //bottom of outer while(true) loop
    } //end of run() method

    private void reverseDirectionFromRightToLeft()
    {
        xBump = -xBump; // reverse increment
        cat1 = catLeft1;
        cat2 = catLeft2;
        catIsRunningToTheLeft  = true;
        catIsRunningToTheRight = false;
    }

    private void reverseDirectionFromLeftToRight()
    {
        xBump = -xBump;
        cat1 = catRight1;
        cat2 = catRight2;
        catIsRunningToTheRight = true;
        catIsRunningToTheLeft  = false;
    }
}