/*******************************************************************************
**                                                                            **
**  @author:    Thanius                                                       **
**  @version:   1.0.0                                                         **
**                                                                            **
**  @info:      Animation Handler -> put Images into an Animation/Sequence    **
**                                                                            **
*******************************************************************************/



package bomberman;


import java.awt.Image;
import java.util.ArrayList;



public class Animation 
{
    private final ArrayList<AnimFrame> frames;
    private int currentFrame;
    private long animTime, totalDuration;
    
    
    public Animation()
    {
        frames = new ArrayList<>();
        totalDuration = 0;
        
        synchronized(this)
        {
            animTime = 0;
            currentFrame = 0;
        }
    }
    
/*******************************************************************************
**                                                                            **
**      M A I N   F U N C T I O N S   F O R   A N I M A T I O N S             **
**                                                                            **
*******************************************************************************/
    
    @SuppressWarnings("unchecked")
    public synchronized void AddFrame(Image image, long duration)
    {
        totalDuration += duration;
        frames.add(new AnimFrame(image, totalDuration));
    }
    
    
    public synchronized void Update(long elapsedTime)
    {
        if(frames.size() > 1)
        {
            animTime += elapsedTime;
            
            if(animTime >= totalDuration)
            {
                animTime %= totalDuration;
                currentFrame = 0;
            }
            
            while(animTime > GetFrame(currentFrame).endTime)
            {
                currentFrame++;
            }
        }
    }
    
    
    public synchronized Image GetImage()
    {
        if(frames.isEmpty())
            return null;
        else
            return GetFrame(currentFrame).image;
    }
    
    
    private AnimFrame GetFrame(int i)
    {
        return frames.get(i);
    }
    
    
    
/*******************************************************************************
**                                                                            **
**      S U B - C L A S S   T O   P E R F O R M   A N I M A T I O N           **
**                                                                            **
*******************************************************************************/
    
    public class AnimFrame
    {
        Image image;
        long endTime;
        
        
        public AnimFrame(Image image, long endTime)
        {
            this.image = image;
            this.endTime = endTime;
        }
    }
}