package org.simantics.interop.update.model;

import java.util.Collection;

import org.simantics.db.Resource;
import org.simantics.db.Statement;
import org.simantics.db.WriteGraph;
import org.simantics.db.exception.DatabaseException;
import org.simantics.interop.test.GraphChanges;
import org.simantics.layer0.Layer0;

/**
 * Simple update operation, where 
 *   addition is based on copying L0.InstanceOf and L0.HasProperty relations.
 *   deletion is deny.
 * 
 * @author luukkainen
 *
 */
public class SimpleObjectUpdateOp extends AddDeleteUpdateOp {
	
	private Statement r;
	protected Resource copyObj;
	
	public SimpleObjectUpdateOp(Statement r, boolean add, GraphChanges changes) {
		super(changes);
		this.r = r;
		this.add = add;
	}
	
	@Override
	protected void _apply(WriteGraph g) throws DatabaseException {
		if (add) {
			Resource parent = null;
			if (getChanges().getComparable().containsRight(r.getSubject()))
				parent = getChanges().getComparable().getLeft(r.getSubject());
			else {
				Collection<UpdateOp> parentOps = getParentOps();
				if (parentOps.size() != 1)
					throw new RuntimeException("Parent not found.");
				parent = parentOps.iterator().next().getCreatedResource();
			}
			if (parent == null)
				throw new RuntimeException("Parent not found.");
			
			Layer0 L0 = Layer0.getInstance(g);
			
			Resource sourceObj = r.getObject();
			
			copyObj = g.newResource();
			copyTypes(g, sourceObj, copyObj);
			copyProperties(g, sourceObj, copyObj);
			g.claim(parent, r.getPredicate(), copyObj);
				
		} else {
			
			Resource sourceObj= r.getObject();
			g.deny(sourceObj);
			
		}

	}
	
	@Override
	public Statement getStatement() {
		return r;
	}
	
	@Override
	public Resource getResource() {
		return r.getObject();
	}
	
	@Override
	public Resource getCreatedResource() {
		return copyObj;
	}
	
	@Override
    public String toString() {
        return super.toString() + " " + r.getSubject() + " " + r.getPredicate() + " " + r.getObject();
    }
	

}