package com.c2kernel.gui.data;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.tree.DefaultMutableTreeNode;

import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.gui.DynamicTreeBuilder;
import com.c2kernel.gui.EntityTabManager;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.lookup.Path;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Language;
import com.c2kernel.utils.Logger;
import com.c2kernel.utils.Resource;

public abstract class Node implements Runnable {

    protected Path binding;
    protected DefaultMutableTreeNode treeNode;
    protected String name; // domain key
    protected int sysKey; // target item
    // attributes
    protected String type = "";
    protected Icon icon;
    protected boolean isExpandable = false;
    protected HashMap childNodes = new HashMap();
    protected ArrayList subscribers = new ArrayList();
    protected DynamicTreeBuilder loader = null;
    private boolean loaded = false;
    private String iconName;
    protected EntityTabManager desktop;
    static ImageIcon folder = Resource.getImageResource("folder.png");
    static ImageIcon emptyLeaf = Resource.getImageResource("leaf.png");

    public Node() {
    }
    
    protected void createTreeNode() {
        this.treeNode = new DefaultMutableTreeNode(this);
    }
    
    public Node(Path path, EntityTabManager desktop) {
        this.binding = path;
        this.desktop = desktop;
        this.sysKey = path.getSysKey();
        // get the name of this node (last path element)
        String[] pathComponents = path.getPath();
        if (pathComponents.length > 0)
            this.name = pathComponents[pathComponents.length-1];
        else
            this.name = Gateway.getProperty("Name");
    }
    
    public EntityTabManager getDesktop() {
        return desktop;
    }

    public Node newNode(Path path)
    {
        try {
            if (path.getEntity() instanceof AgentPath)
                return new NodeAgent(path, desktop);
            else
                return new NodeItem(path, desktop);
        } catch (ObjectNotFoundException ex) {
            return new NodeContext(path, desktop);
        }  

    }

    /** Inserts a tree builder as the first child of the node, so it can be opened in the tree
    */
    public void makeExpandable() {
        if (isExpandable) return;
        loader = new DynamicTreeBuilder(this.treeNode);
        this.treeNode.insert(loader.getTreeNode(),0);
        isExpandable = true;
    }


    public DefaultMutableTreeNode getTreeNode() {
        return treeNode;
    }

    public void setTreeNode(DefaultMutableTreeNode treeNode) {
        this.treeNode = treeNode;
        treeNode.setUserObject(this);
    }

    /** Subscription for loading node children.
      * Note this is separate from the itemproxy subscription as it included query of the naming service
      * and eventually should not require access to the item at all for higher performance */
    public void subscribeNode(NodeSubscriber target) {
        subscribers.add(target);
        if (loaded == false) {
            loaded = true;
            loadMore();
        }
        else {
            synchronized (childNodes) {
                Node newNode;
                for (Iterator nodes = childNodes.values().iterator(); nodes.hasNext();) {
                    newNode = (Node)nodes.next();
                    Logger.msg("subscribeNode target.add("+newNode.name+")");
                    target.add(newNode);
                }
            }
        }
    }
    
    public void loadMore() {
        Thread loading = new Thread(this);
        loading.start();
    }

    public void unsubscribeNode(NodeSubscriber target) {
        subscribers.remove(target);
    }

    public void add(Node newNode) {
        synchronized(childNodes) {
            childNodes.put(newNode.getPath(), newNode);
            for (Iterator e = subscribers.iterator(); e.hasNext();) {
                NodeSubscriber thisSub = (NodeSubscriber)e.next();

                thisSub.add(newNode);
            }
        }
    }
    
    public void remove(Path oldPath) {
        synchronized(childNodes) {
            childNodes.remove(oldPath);
            for (Iterator e = subscribers.iterator(); e.hasNext();) {
                NodeSubscriber thisSub = (NodeSubscriber)e.next();
                thisSub.remove(oldPath);
            }
        }
    }
    
    public void removeAllChildren() {
        synchronized(childNodes) {
            Path thisPath;
            while (childNodes.keySet().iterator().hasNext()) {
                remove((Path)childNodes.keySet().iterator().next());
            }
        }
    }

    public Node getChildNode(Path itsPath) {
        for (Iterator i = childNodes.keySet().iterator(); i.hasNext();) {
            Object next = i.next(); 
            if ( next.equals(itsPath) ) return (Node)childNodes.get(next);
        }
        return null;
    }

    // end of current batch
    public void end(boolean more) {
        for (Iterator e = subscribers.iterator(); e.hasNext();) {
            NodeSubscriber thisSub = (NodeSubscriber)e.next();
            thisSub.end(more);
        }
    }


    public void run() {
        Thread.currentThread().setName("Node Loader: "+name);
        loadChildren();
    }

    public abstract void loadChildren();
    
    public void refresh() {
        removeAllChildren();
        loadChildren();
    }
    
    // Getters and Setters

    public int getSysKey() { return sysKey; }
//  public void setSysKey( int sysKey ) { this.sysKey = sysKey; }

    public String getName() { return name; }
//  public void setName( String name ) { this.name = name; }

    public String getType() { return type; }
//  public void setType( String type ) { this.type = type; }

    public Path getPath() { return binding; }

    public DynamicTreeBuilder getTreeBuilder() { return loader; }
    
    public String toString() {
        if (this.name.length() > 0) {
            return this.name;
        }
        else { return "Cristal"; }
    }

    public Icon getIcon() {
        if (icon != null) return icon;
        return(isExpandable?folder:emptyLeaf);
    }

    public String getIconName() {
        return iconName;
    }
    
    public void setIcon(String icon) {
        iconName = icon;
        this.icon = Resource.getImageResource("typeicons/"+icon+"_16.png");
    }

	public JPopupMenu getPopupMenu() {
		JPopupMenu popup = new JPopupMenu();
		JMenuItem menuItem = new JMenuItem(Language.translate("Refresh"));
		menuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (isExpandable) refresh();
			}
		});
		popup.add(menuItem);
		return popup;
	}
}