public class Player extends Actor
{
    
    private int vSpeed = 0;                  //How fast the player falls down. Vertical speed.
    private int acceleration = 2;           //Acceleration when falling
    private boolean jumping;            //Keeps track of whether the player is jumping or not
    private int jumpStrength = 20;         //How high the player jumps
    private int speed = 4;         //How fast the player will move around
        
    /**
     * Act - do whatever the Player wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        checkFall();            //Plays a loop. Checks for ground...
        checkKey();               //Ables basic movement
        platformAbove();            // Stops the player from jumping through a platform
        eat();               //"Eats" the points
        
    }    
    
    public void checkKey()                                  //Check the keyboard
    {
        if(Greenfoot.isKeyDown("up") && jumping == false)               // When the up key is pressed the player will jump
        {
            jump();
        }
        if(Greenfoot.isKeyDown("right"))               //Press the right key to go right
        {
            moveRight();
        }
        if(Greenfoot.isKeyDown("left"))                 // Press the left key to go left
        {
            moveLeft();
        }
    }
    
    public void moveRight()                             //make the player move right
    {
        setLocation(getX()+speed, getY());                 //Where he is on the screen with the y co-ordinate
    }
    public void moveLeft()
    {
        setLocation(getX()-speed, getY());                     // Same as above except goes in different direction
    }
    
    public void fall()
    {
        setLocation(getX(), getY() +vSpeed);                  //Checks if player is on the ground
        if(vSpeed <=9)
        {
            vSpeed = vSpeed + acceleration;                    // falls as fast as the speed combined with the acceleration
            if (atBottom())
                gameRestart();
        }
        jumping = true;                               // Will stop the player from jumping while falling   
    }
    
    private boolean atBottom()                         //This method will decide if Player has fallen
    {
        return getY() >= getWorld().getHeight()-2;
        
    }
    
    private void gameRestart()                       //Restarts the world
    {
        Greenfoot.setWorld(new JurrasicPark());
    }
    
    public boolean onGround()
    {
        int spriteHeight = getImage(). getHeight();                      //Finds out how big the player is
        int lookForGround = (int)(spriteHeight/2) + 5;                  //Looks for ground 5 by 5 pixels under the player
        
        Actor ground = getOneObjectAtOffset(0, lookForGround, Platform.class);
        if(ground == null)            // If there is no ground...
        {
            jumping = true;
            return false;                //Keeps on falling
        }
        else
        {
            moveToGround(ground);               //Moves to the top of the platform
            return true;
        }
    }
    
    public boolean platformAbove()
    {
        int spriteHeight = getImage(). getHeight();                //Finds out how big the player is
        int yDistance = (int)(spriteHeight/ -2);                         //Divide by a negative number so it looks above not below the player

        Actor ceiling = getOneObjectAtOffset(0, yDistance, Platform.class);               //Looks for y distance above 
        if(ceiling != null)              // If it is not null...
        {
            vSpeed =1;                  //Make the player go down
            bumpHead(ceiling); 
            return false;                //Keeps on falling
        }
        else
        {
            return true;
        }
    }
    
    public void bumpHead(Actor ceiling)                 //Stops the player from jumping through a platform
    {
        int ceilingHeight = ceiling.getImage().getHeight();
        int newY = ceiling.getY() + (ceilingHeight + getImage().getHeight())/2;
        
        setLocation(getX(), newY);
    }
        
    public void moveToGround(Actor ground)                     //Makes the player touch the platform on the surface
    {
        int groundHeight = ground.getImage().getHeight();
        int newY = ground.getY() - (groundHeight + getImage().getHeight())/2;
        
        setLocation(getX(), newY);
        jumping = false;                  // Not jumping and touching ground so that he is ready to jump
    }
    
    public void checkFall()           // This codes checks whether the player is on the ground or not
                                                  // If it is then it makes the vertical speed 0 which stops the player from falling. If not then continues to fall
    { 
        if(onGround())
        {
            vSpeed = 0;
        }
        else
        {
            fall();
        }
    }
    
    public void jump()
    {
        vSpeed = vSpeed - jumpStrength;           //Puts the player in the air
        jumping = true;            //Checks whether the player is jumping or not
        fall();        // Makes the player fall after it has jumped
    }
    
    public void eat()
    {
        Actor point;
        point = getOneObjectAtOffset(0, 0, Point.class);
        if (point != null)
        {
            World world;
            world = getWorld();
            world.removeObject(point);
        }
    }
}