package frame.object.data;

import chat.server.call.IJSONWriter;
import frame.object.meta.EntityMeta;


public class Node extends Entity {

	protected Node parent;
	protected EntitySet children;
	protected int level;
	
	
	public Node(EntityMeta entityMeta) {
		super(entityMeta);
		children = new EntitySet(entityMeta);
		level = 0;
	}
	
	public Node getParent() {
		return parent;
	}
	
	public EntitySet getChildren() {
		return children;
	}
	
	public int getLevel() {
		return level;
	}

	public void changeParent(Node newParent) throws Exception {
		//1.
		parent.deleteChild(this);
		newParent.addChild(newParent);
		
		//2.
		String parentid = newParent.getString("id");
		set("parentid", parentid);
	}
	
	private void deleteChild(Node child) {
//		String id = child.getString("id");
		//TODO
	}

	public void addChild(Node child) {
		child.level = level + 1;
		children.append(child);
	}

	public void deleteChildren() {
		children.clear();
	}
	
	public ID getParentId() {
		return new ID(getVarinatValue("parentId"));
	}

	public Node getRoot() {
		Node current = this;
		Node parent = current.parent;
		
		while (parent != null) {
			current = parent;
			parent = current.parent;
		}
		
		return current;
	}

	@Override
	public void writeJSONData(IJSONWriter writer) {
		//1. node 
		writer.write("level", level);
		
		//2. entity
		super.writeJSONData(writer);
		
		//3. children
		if (!children.isEmpty()) {
			writer.writeName("children");
			children.writeJSONObject(writer);
		}
	}
	
}