import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;



public class MainGameCanvas extends GameCanvas implements Runnable {
    // midlet
    private GameMidlet midlet = null;
    // graphic context
    private Graphics graphics = null;
    //  thread
    private volatile Thread animationThread = null;
    // manager Game
    private  LayerManager gameManager = null;
    // background game
    private  Background background = null;
    // ship
    private Ship ship = null;
    // boll
    private Boll boll = null;
    // fps
    private int fps = 50;
    // screen width
    int screenWidth = 0;
    // screen height
    int screenHeight = 0;
    
    public MainGameCanvas(GameMidlet midlet) throws Exception {
        // constructor super class
        super(true);
        // midlet
        this.midlet = midlet;
        // full screen game
        setFullScreenMode(true);
        // graphic context
        graphics = getGraphics();
        // screen width
        screenWidth = this.getWidth();
        // screen height
        screenHeight = this.getHeight();
        // creation Layer Manager
        gameManager = new LayerManager();
        // creating game
        createGame();
    }
    
    
    public void start() {
        // new thread for game
        animationThread = new Thread(this);
        // start thread
        animationThread.start();
    }
    
    
    public void run() {
        Thread currentThread = Thread.currentThread();
        try {
            while (currentThread == animationThread) {
                long startTime = System.currentTimeMillis();
                if (isShown()) {
                    updateGame();
                    draw();
                    flushGraphics();
                }
                long endTime = System.currentTimeMillis() - startTime;
                if (endTime < fps) {
                    synchronized (this) {
                        wait(fps - endTime);
                    }
                } else {
                    currentThread.yield();
                }
            }
        } catch (InterruptedException ie) {
        }
    }
    
    public void stop() {
        // stop animations
        animationThread = null;
    }
    
    
    public void keyPressed(int keyCode) {
        if(keyCode == -6 || keyCode == -7) {
            this.stop();
            midlet.exitGame();
        }
    }
    
    
    private void draw() {
        graphics.setColor(0, 0, 0);
        graphics.fillRect(0, 0, screenWidth, screenHeight);
        gameManager.paint(graphics, 0, 0);
        // draw number AI
        boll.drawAIBoll(graphics);
        // draw position ship and boll
        graphics.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_SMALL));
        graphics.drawString("Boll X = " + boll.getX(), 2 , Font.getDefaultFont().getHeight(), 0);
        graphics.drawString("Boll Y = " + boll.getY(), 2 , Font.getDefaultFont().getHeight() * 2, 0);
        graphics.drawString("Ship X = " + ship.getX(), 2 , Font.getDefaultFont().getHeight() * 3, 0);
        graphics.drawString("Ship Y = " + ship.getY(), 2 , Font.getDefaultFont().getHeight() * 4, 0);
        // draw rect boll
        graphics.drawRect(boll.getX() - 40,  boll.getY() - 40, boll.WIDTH + 80, boll.HEIGHT + 80);
    }
    
    
    public void createGame() throws Exception {
        //**********************************************
        //  creating background
        //**********************************************
        try{
            Image imageBackground = Image.createImage("/Background.png");
            background = new Background(Background.COLUMNS_WIDTH,
            Background.ROWS_HEIGHT, imageBackground, Background.WIDTH,
            Background.HEIGHT);
            background.setVisible(false);
            imageBackground = null;
        }catch (Exception ex) {
            System.err.println("Background it is not loaded");
        }
        //**********************************************
        //  creating  ship
        //**********************************************
        try{
            Image imageShip = Image.createImage("/Ship.png");
            ship = new Ship(this, imageShip, Ship.WIDTH, Ship.HEIGHT);
            ship.setVisible(false);
            imageShip = null;
        }catch (Exception ex) {
            System.err.println("Ship.png it is not loaded");
        }
        //**********************************************
        //  creating  boll
        //**********************************************
        try{
            Image imageBoll = Image.createImage("/Boll.png");
            boll = new Boll(this, imageBoll, 16, 24);
            boll.setVisible(false);
            imageBoll = null;
        }catch (Exception ex) {
            System.err.println("Boll.png it is not loaded");
        }
    }
    
    
    public void setGame(){
        //**********************************************
        // background
        //**********************************************
        // create background
        background.createBackground();
        // set position background
        background.setPosition(0, -screenHeight);
        // background visible
        background.setVisible(true);
        //**********************************************
        //  ship
        //**********************************************
        // set position ship
        ship.setPosition(screenWidth/2 - 30,  screenHeight - 68);
        // ship visible
        ship.setVisible(true);
        //**********************************************
        //  boll
        //**********************************************
        // set position boll
        boll.setPosition(screenWidth/2 - boll.WIDTH/2,  screenHeight/2 - boll.HEIGHT/2);
        // boll visible
        boll.setVisible(true);
        //**********************************************
        //  add component to Game
        //**********************************************
        // add ship
        gameManager.append(ship);
        // add boll
        gameManager.append(boll);
        // add background
        gameManager.append(background);
    }
    
    public void updateGame() {
        //**********************************************
        //  user input
        //**********************************************
        int keyStates = getKeyStates();
        // move down
        if ((keyStates & DOWN_PRESSED) != 0) {
            ship.moveShip(1);
          
       }
         

  else if ((keyStates & UP_PRESSED) != 0) {
            ship.moveShip(2);
  
 }       
         
          else if ( (keyStates & LEFT_PRESSED) != 0)  {
            ship.moveShip(3);

}
             

          else if ((keyStates & RIGHT_PRESSED) !=0 )  {
            ship.moveShip(4);
  
            // stop
        } else {
            ship.moveShip(0);
        }
 
          
           
         

       
        //**********************************************
        //  move
        //**********************************************
        // move boll
        boll.moveBoll(ship);
        // move background
        background.moveBackground(screenHeight);
    }
}