package org.simantics.document.ui.actions;

import java.io.IOException;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.common.utils.NameUtils;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.adapter.ActionFactory;
import org.simantics.document.DocumentResource;
import org.simantics.graphfile.util.GraphFileUtil;
import org.simantics.layer0.Layer0;
import org.simantics.ui.SimanticsUI;

public class NewFileDocument implements ActionFactory {
	Resource relation;
	String defaultName;
	
	public NewFileDocument(ReadGraph graph, String relationUri, String defaultName) throws DatabaseException {
		relation = graph.getResource(relationUri);
		this.defaultName = defaultName;
	}
	
	@Override
	public Runnable create(Object target) {

		if(!(target instanceof Resource))
			return null;

		final Resource resource = (Resource)target;

		return new Runnable() {
			@Override
			public void run() {
				SimanticsUI.getSession().asyncRequest(new WriteRequest() {
					
					@Override
					public void perform(WriteGraph graph) throws DatabaseException {
					    graph.markUndoPoint();
					    
						Layer0 l0 = Layer0.getInstance(graph);

	                    String name = NameUtils.findFreshName(graph, defaultName, resource, relation);
	            		DocumentResource doc = DocumentResource.getInstance(graph);
	            		
	            		Resource fileResource = graph.newResource();
	            		graph.claim(fileResource, l0.InstanceOf, doc.FileDocument);
	                    graph.claimLiteral(fileResource, l0.HasName, name);
	                    graph.claim(resource, relation, fileResource);
	                    try {
	                    	GraphFileUtil.writeDataToGraph(graph, new byte[0], fileResource);
	                    } catch (IOException e) {
	                    	throw new DatabaseException(e);
	                    }
					}
					
				});
			}
		};
	}
}