package org.simantics.modeling.tests.commands;

import org.simantics.Simantics;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteResultRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.testing.common.Command;
import org.simantics.db.testing.common.CommandSequenceEnvironment;
import org.simantics.modeling.tests.traits.SingleResourceTrait;
import org.simantics.modeling.tests.traits.UriResourceTrait;

abstract public class ResourceWriteCommand<T extends CommandSequenceEnvironment> extends Command<T> implements SingleResourceTrait {

	private Resource resource;
	
	@Override
	final public void run(final T environment) throws Exception {
		resource = runResource(environment); 
		afterRun(environment);
	}
	
	public Resource runResource(final T environment) throws Exception {
		return Simantics.getSession().sync(new WriteResultRequest<Resource>() {

			@Override
			public Resource perform(WriteGraph graph) throws DatabaseException {
				return ResourceWriteCommand.this.run(graph, environment);
			}
			
			@Override
			public String toString() {
				return ResourceWriteCommand.this.toString();
			}
			
		});
	}
	
	protected Resource run(WriteGraph graph, T environment) throws DatabaseException {
		throw new IllegalStateException();
	}
	
	protected void afterRun(T environment) throws Exception {
		
	}

	@Override
	public String toString() {
		return "ResourceWriteCommand " + getClass().getSimpleName();
	}
	
	@Override
	public Resource getResource() throws DatabaseException {
		return resource;
	}
	
	@Override
	public Resource getResource(ReadGraph graph) throws DatabaseException {
		return resource;
	}
	
	@Override
	public SingleResourceTrait child(String path) {
		return new UriResourceTrait(this, path);
	}
	
}