package org.csstudio.sds.internal.eventhandling;

import org.csstudio.sds.SdsPlugin;
import org.csstudio.sds.eventhandling.AbstractWidgetPropertyPostProcessor;
import org.csstudio.sds.model.AbstractWidgetModel;
import org.csstudio.sds.model.BorderStyleEnum;
import org.csstudio.sds.model.WidgetProperty;
import org.csstudio.sds.model.commands.HidePropertyCommand;
import org.csstudio.sds.model.commands.ShowPropertyCommand;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;

/**
 * Hides {@link AbstractWidgetModel#PROP_BORDER_COLOR} and
 * {@link AbstractWidgetModel#PROP_BORDER_WIDTH} when
 * {@link AbstractWidgetModel#PROP_BORDER_STYLE} is set to
 * {@link BorderStyleEnum#NONE}.
 * 
 * @author Sven Wende
 * 
 */
public class BehaviourPropertyPostProcessor extends AbstractWidgetPropertyPostProcessor<AbstractWidgetModel> {

	/**
	 *{@inheritDoc}
	 */
	@Override
	protected Command doCreateCommand(AbstractWidgetModel widget) {
		assert widget != null : "widget != null";
		return new EnsureInvariantsCommand(widget);
	}

	private static final class EnsureInvariantsCommand extends Command {
		private AbstractWidgetModel widget;
		private CompoundCommand chain;

		private EnsureInvariantsCommand(AbstractWidgetModel widget) {
			this.widget = widget;
		}

		@Override
		public void execute() {
			if (chain == null) {
				chain = new CompoundCommand();

				// .. determine the selected behavior
				String behaviorId = widget.getBehaviorProperty(AbstractWidgetModel.PROP_BEHAVIOR);
				
				IBehaviorService behaviourService = SdsPlugin.getDefault()
						.getBehaviourService();
				String[] invisiblePropertyIds = behaviourService
						.getInvisiblePropertyIds(behaviorId, widget.getTypeID());
				
				for (WidgetProperty property : widget.getProperties()) {
					chain.add(new ShowPropertyCommand(widget, property.getId(), AbstractWidgetModel.PROP_BEHAVIOR));
				}
				for (String propertyId : invisiblePropertyIds) {
					chain.add(new HidePropertyCommand(widget, propertyId, AbstractWidgetModel.PROP_BEHAVIOR));
				}
			}

			chain.execute();
		}

		@Override
		public void undo() {
			chain.undo();
		}
	}
}