package org.csstudio.sds.internal.eventhandling;

import org.csstudio.sds.eventhandling.AbstractWidgetPropertyPostProcessor;
import org.csstudio.sds.model.AbstractWidgetModel;
import org.csstudio.sds.model.BorderStyleEnum;
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 BorderPropertyPostProcessor extends AbstractWidgetPropertyPostProcessor<AbstractWidgetModel> {

	/**
	 *{@inheritDoc}
	 */
	@Override
	protected Command doCreateCommand(AbstractWidgetModel widget) {
		return new HideBorderStuffCommand(widget);
	}

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

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

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

				// .. determine the selected border style
				int optionIndex = widget.getArrayOptionProperty(AbstractWidgetModel.PROP_BORDER_STYLE);

				if (BorderStyleEnum.NONE.getIndex() == optionIndex || 
						BorderStyleEnum.RAISED.getIndex() == optionIndex ||
						BorderStyleEnum.LOWERED.getIndex() == optionIndex) {
					// .. hide color and width properties, when no border style
					// is set
					chain.add(new HidePropertyCommand(widget, AbstractWidgetModel.PROP_BORDER_WIDTH, AbstractWidgetModel.PROP_BORDER_STYLE));
					chain.add(new HidePropertyCommand(widget, AbstractWidgetModel.PROP_BORDER_COLOR, AbstractWidgetModel.PROP_BORDER_STYLE));
				} else {
					// .. show color and width properties, when a border style
					// is set
					chain.add(new ShowPropertyCommand(widget, AbstractWidgetModel.PROP_BORDER_WIDTH, AbstractWidgetModel.PROP_BORDER_STYLE));
					chain.add(new ShowPropertyCommand(widget, AbstractWidgetModel.PROP_BORDER_COLOR, AbstractWidgetModel.PROP_BORDER_STYLE));
				}
			}

			chain.execute();
		}

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