package structures;

import java.awt.Dimension;
import java.util.LinkedList;
import utils.labeling;

public class labels {
	
	int width = 0;
	
	int height = 0;
	
	int nlabels = 0;
	
	int labels[] = null;
	
	LinkedList<struct_label> list = null; /*the first slot is empty*/
	
	public int get_nlabels () {
		return nlabels;
	}
	
	public int[] get_image_label () {
		return labels;
	}	
	
	public LinkedList<struct_label> get_label_list () {
		return list;
	}
	
	public void clean () {	
		/*cleaning the region of that label in the image*/
		for(int i = 0; i < width*height; i++) {
			if (!list.get(labels[i]).active) {
				labels[i] = 0;
			}
		}
		/*removing the label*/
		for (int i = 0; i < nlabels; i++) {
			if (!list.get(i).active) {
				list.remove(i--);
				nlabels = list.size();
			}
		}
	}
	
	public labels (int regions[], int width, int height) {

		this.width = width;
		
		this.height = height;
		
		Dimension d = new Dimension();
		
		d.setSize(width, height);		
		
		labeling alg = new labeling();
		
		labels = alg.compactLabeling (regions, d, true);
		
		nlabels = alg.getMaxLabel() + 1;
		
		list = new LinkedList<struct_label>();
		
		for (int i = 0; i < nlabels; i++) {
			struct_label l = new struct_label();
			l.id = i;
			l.xmin = l.ymin = Integer.MAX_VALUE;
			l.xmax = l.ymax = Integer.MIN_VALUE; 
			l.barx = l.bary = l.surf = 0; 
			l.active = true;
			l.weight = 0.0;
			list.add(l);
		}

		for(int i = 0; i < width*height; i++) {
			int x = i % width; int y = i / width;
			int l = labels[i];
			if (l != 0) { /*black (0) is assumed as background*/
				list.get(l).xmin = Math.min (list.get(l).xmin, x);
				list.get(l).xmax = Math.max (list.get(l).xmax, x);
				list.get(l).ymin = Math.min (list.get(l).ymin, y);
				list.get(l).ymax = Math.max (list.get(l).ymax, y);
				list.get(l).barx += x; list.get(l).bary += y;	
				list.get(l).regions = 1;
				list.get(l).surf++;
			}
		}
	}
}