package gameplay.frames;

import java.util.ArrayList;

/**
 * This will handle the next frames to be played by each entity.
 * @author Victor Azra
 */
public class nextFrameBuffer {
	
	private Frame current;
	private nextFrameBuffer next;
	
	/**
	 * creates a new framebuffer, empty for now
	 */
	public nextFrameBuffer() {
		this.current = null;
		this.next = null;
	}
	
	public void setCurrentFrame(Frame f) {
		this.current = f;
	}
	
	public void clone(nextFrameBuffer f) {

		try{
			Frame cf = new Frame();
			cf.clone(f.current);
			this.current = cf; }
		catch (NullPointerException n) {
			this.current = null;
			this.next = null;
		}
		nextFrameBuffer nfb = new nextFrameBuffer();
		try {
			nfb.clone(f.next);
		} catch (NullPointerException n) {}
		this.next = nfb;

	}
	
	public void setNext(nextFrameBuffer f) {
		this.next.clone(f);
	}
	
	public void emptyQueue() {
		this.next = null;
	}
	
	public void empty() {
		this.current = null;
		this.next = null;
	}
	
	public void goToNext() {
		//try {
			nextFrameBuffer nfb = new nextFrameBuffer();
			nfb.clone(this.next);
			this.clone(nfb);
		/*} catch (NullPointerException n) {
			this.setCurrentFrame(null);
			this.setNext(new nextFrameBuffer());
		}*/
	}
	
	public Frame getCurrentFrame() {
		return this.current;
	}
	
	public Frame getNextframe() {
		try {
			return this.next.current;
		} catch(NullPointerException e) {return null;}
	}
	
	/**
	 * Adds a frame at the end of the buffer
	 * @param f the frame to add at the end
	 */
	public void addFrameToQueue(Frame f) {
		if(this.current == null) {
			this.current = f;
		} else if(this.next == null){
			nextFrameBuffer fb = new nextFrameBuffer();
			fb.current = f;
			this.next = fb;			
		} else {
			this.next.addFrameToQueue(f);
		}
	}

	/**
	 * Copies the same amount of frames from f in this, as the amount originally present, but keepsoriginal move data
	 * @param f frames array to copy
	 */
	public void changeFramesExceptForMove(ArrayList<Frame> f) {
		int i = 0;
		boolean goOn = true;
		nextFrameBuffer fb = new nextFrameBuffer();
		fb.clone(this);
		this.emptyQueue();
		try{fb.goToNext();} catch(NullPointerException e) {goOn = false;}
		while(goOn && i < f.size()) {
			try{
			fb.current.cloneWithoutMovement(f.get(i));
			this.addFrameToQueue(fb.current);
			fb.goToNext();
			i++;
			} catch(NullPointerException e) { goOn = false;}
		}
	}

}