package org.simantics.views.swt.loader;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.eclipse.swt.custom.CTabItem;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.request.UniqueRead;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.util.Simantics;
import org.simantics.db.layer0.variable.Variable;
import org.simantics.db.layer0.variable.Variables;
import org.simantics.scenegraph.ParentNode;
import org.simantics.scenegraph.loader.ScenegraphLoader;
import org.simantics.views.swt.client.base.ISWTViewNode;
import org.simantics.views.swt.client.impl.SWTTabFolder;

public class TabFolderLoader implements ScenegraphLoader {

	final private Resource configuration;
	
	public TabFolderLoader(Resource configuration) {
		this.configuration = configuration;
	}
	
	@Override
	public ISWTViewNode create(ParentNode<ISWTViewNode> parent, Variable context) throws DatabaseException {
		
		SWTTabFolder node = parent.addNode(SWTTabFolder.class);
		
		final Collection<Variable> children = LoaderUtils.getChildren(configuration);

		String[] names = Simantics.getSession().sync(new UniqueRead<String[]>() {

			@Override
			public String[] perform(ReadGraph graph) throws DatabaseException {
				
				String[] result = new String[children.size()];

				int index = 0;
				for(Variable child : children) {
					result[index++] = child.getPropertyValue(graph, Variables.LABEL);
				}
				
				return result;
				
			}
			
		});
		
		node.setTabNames(names);
		
		return node;
		
	}

	Set<Control> getControls(CTabItem item) {
		HashSet<Control> result = new HashSet<Control>();
		forControl(item.getControl(), result);
		return result;
	}
	
	void forControl(Control control, HashSet<Control> controls) {
		controls.add(control);
		if(control instanceof Composite) {
			Composite composite = (Composite)control;
			for(Control child : composite.getChildren()) forControl(child, controls);
		}
	}
	
}