package org.simantics.interop.update.model;

import java.util.ArrayList;
import java.util.Collection;

import org.eclipse.jface.resource.ImageDescriptor;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.utils.NameUtils;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.exception.NoSingleResultException;
import org.simantics.db.exception.ServiceException;
import org.simantics.db.exception.ValidationException;
import org.simantics.layer0.Layer0;

public class UpdateNode {

	public enum Status {EXIST,DELETED,NEW,CONTAINS};
	

	private Status status;
	private UpdateOp op;
	private Resource r;
	private String label;
	
	
	private Collection<UpdateNode> children = new ArrayList<UpdateNode>();
	/**
	 * 
	 * @param resource old Resource if status is DELETED or EXISTS.
	 * @param status
	 * @param changes
	 */
	public UpdateNode(ReadGraph g, Status status, UpdateOp op) throws DatabaseException{

		this.status = status;
		this.op = op;
		this.r = op.getResource();
		this.label = getLabel(g, r);
	}
	
	public UpdateNode(ReadGraph g, Status status, Resource r) throws DatabaseException {

		this.status = status;
		this.op = null;
		this.r = r;
		this.label = getLabel(g, r);
	}
	
	public Resource getResource() {
		return r;
	}
	
	public Resource getParentResource(ReadGraph g) throws DatabaseException {
		Layer0 l0 = Layer0.getInstance(g);
		return g.getPossibleObject(r, l0.PartOf);
	}
	
	public void setStatus(Status status) {
		this.status = status;
	}
	
	public Status getStatus() {
		return status;
	}
	
	public Collection<UpdateNode> getChildren() {
		return children;
	}
	
	public void addChild(UpdateNode node) {
		children.add(node);
		if (op != null && node.op != null) {
			if (!op.getSubOps().contains(node.op)) {
				op.addSubOp(node.op);
				node.op.addParentOp(op);
			}
		}
	}

	public ImageDescriptor getImage(ReadGraph graph) throws DatabaseException {
		return null;
	}

	public String getLabel() {
		return label;
	}
	
	@Override
	public String toString() {
		return label;
	}
	
	protected String getLabel(ReadGraph graph, Resource r) throws DatabaseException {
		String label = NameUtils.getSafeLabel(graph, r);
		if (label.length() == 0)
			label = NameUtils.getSafeName(graph, r);
		
		return label;
	}


	public UpdateOp getOp() {
		return op;
	}

}