package uk.ac.leeds.ccg.geotools;

import java.lang.*;
import java.awt.*;
import java.util.*;
import java.io.*;

/** an <strong>experimental</strong> class to hold multiple layers as if a
 * single layer. Layers are drawn in the order they are added.
 * <p>Ian
 */
public class MultiLayer extends SimpleLayer implements
LayerChangedListener{
    static boolean DEBUG=false;
    static String DBC="ML->";
    public Vector layers = new Vector();
    GeoRectangle bounds = new GeoRectangle();
    
    public MultiLayer(){
    }
		public void clearLayers(boolean quite){
			//layers= new Vector();
			layers.clear();
			if(!quite) notifyLayerChangedListeners(LayerChangedEvent.DATA);
		}
		public void clearLayers(){
			clearLayers(false);
		}
    public void paintScaled(GeoGraphics gg){
        GeoRectangle ext = gg.scale.getMapExtent();
        
        for(int i=0;i<layers.size();i++){
            if(DEBUG){System.out.println(DBC+"painting layer");}
            if(((Layer)layers.elementAt(i)).getBounds().intersects(ext))
            {
                ((Layer)layers.elementAt(i)).paintScaled(gg);
            }
            else{
                if(DEBUG){System.out.println(DBC+"painting layer "+layers.elementAt(i)+" blocked because it is out of bounds");
                System.out.println(" "+((Layer)layers.elementAt(i)).getBounds()+" not within "+ext);
                }
                }
            }
        }
        public void paintHighlight(Graphics g,Scaler scale,int id,ShadeStyle style){
            GeoRectangle ext = scale.getMapExtent();
            for(int i=0;i<layers.size();i++){
                if(((Layer)layers.elementAt(i)).getBounds().intersects(ext))
                    ((Layer)layers.elementAt(i)).paintHighlight(g,scale,id,style);
            }
        }
        public GeoRectangle getBoundsOf(int id){
            GeoRectangle ret = new GeoRectangle();
            for(int i=0;i<layers.size();i++){
                ret=((Layer)layers.elementAt(i)).getBoundsOf(id);
                if(!ret.isEmpty()) return ret;
            }
            return ret;
            
        }
        public GeoRectangle getBoundsOf(int [] ids){
            GeoRectangle ret = new GeoRectangle();
            for(int i=0;i<layers.size();i++){
                ret.add(((Layer)layers.elementAt(i)).getBoundsOf(ids));
            }
            return ret;
        }

        public int getID(double x, double y){
            int id = -1;
            for(int i=0;i<layers.size();i++){
                id=((Layer)layers.elementAt(i)).getID(x,y);
                if(id!= -1) return id;
            }
            return id;
        }
        public int getID(GeoPoint p){
            return getID(p.x,p.y);
        }
        
        /** Add a new layer to this multiLayer and send a LayerChanged event
         * for the multiLayer to notify that DATA has changed.
         * @param l The layer to add.
         */
        public void addLayer(Layer l){
					addLayer(l,false);
				}
        /** Add a new layer to this multiLayer.
         * @param l The layer to add.
         * @param quite If false, a LayerChanged event is sent for the
         * multiLayer to notify that the DATA has changed.
         */
        public void addLayer(Layer l,boolean quite){
            if(DEBUG){System.out.println("MultiLayer: addLayer ");}
            bounds.add(l.getBounds());
            layers.addElement(l);
            l.addLayerChangedListener(this);
            if(!quite)notifyLayerChangedListeners(LayerChangedEvent.DATA);
        }

        /** Remove a layer.
         * A LayerChanged event is sent to notify that
         * the DATA has changed.
         * @param l The layer to remove */
        public void removeLayer(Layer l){
            removeLayer(l,false);
        }

        /** Remove a layer.
         * @param l The layer to remove
         * @param quite If false, a LayerChanged event is sent to notify that
         * the DATA has changed */
        public void removeLayer(Layer l,boolean quite){
            if(DEBUG){System.out.println("MultiLayer: removeLayer ");}
            layers.removeElement(l);
            l.removeLayerChangedListener(this);
						bounds=new GeoRectangle();
						for(int i=0;i<layers.size();i++){
							bounds.add(((Layer)layers.elementAt(i)).getBounds());
						}
            if(!quite)notifyLayerChangedListeners(LayerChangedEvent.DATA);
        }
        /** Return the layers that have been added to this multiLayer.
         */
        public Vector getLayers(){
            return layers; // possibly should clone here?
        }
        public GeoRectangle getBounds(){
           // return bounds;
            //this is a temp fix
            bounds=new GeoRectangle();
							for(int i=0;i<layers.size();i++){
								bounds.add(((Layer)layers.elementAt(i)).getBounds());
							}
            return bounds;
        }
        public void setBounds(GeoRectangle r){
            bounds=r;
        }
        public void layerChanged(LayerChangedEvent e){
            if(e.getReason()==LayerChangedEvent.GEOGRAPHY){
							bounds=new GeoRectangle();
							for(int i=0;i<layers.size();i++){
								bounds.add(((Layer)layers.elementAt(i)).getBounds());
							}
            }
            notifyLayerChangedListeners(e.getReason());
            if(DEBUG){System.out.println("MultiLayer: notifyLayerChanged ");}
        }
        
        public GeoShape getGeoShape(int id){
            GeoShape result = null;
            for(int i=0;i<layers.size();i++){
                Layer l = (Layer)layers.elementAt(i);
                if(l instanceof ShapeLayer){
                    result = ((ShapeLayer)l).getGeoShape(id);
                    if(result!=null){
                        return result;
                    }
                }
            }
            return null;
        }
	public int[] getIDs(GeoRectangle box,int mode){
						int [] ids=new int[0];
						int [] tmp=new int[0];
            for(int i=0;i<layers.size();i++){
                int [] id=((Layer)layers.elementAt(i)).getIDs(box,mode);
								tmp=ids;
								ids=new int[id.length+ids.length];
								System.arraycopy(tmp,0,ids,0,tmp.length);
								System.arraycopy(id,0,ids,tmp.length,id.length);

            }
            return ids;
			
	}
}