package com.dragome.forms.bindings.client.form.metadata.binding;

import static com.dragome.forms.bindings.client.form.metadata.MetadataPlugin.getMetadata;

import com.dragome.forms.bindings.client.binding.AbstractValueBinding;
import com.dragome.forms.bindings.client.form.Field;
import com.dragome.forms.bindings.client.value.ValueModel;

/**
 * Created by IntelliJ IDEA.
 * User: andrew
 * Date: Feb 24, 2010
 * Time: 1:23:47 PM
 * To change this template use File | Settings | File Templates.
 */
public class ConditionBinderBuilder<T>
{
	private MetadataBinder binder;
	private T target;
	private ConditionBinderWidgetAction<T> action;
	private ConditionBinderMetadataAction<T> metadataAction;

	public ConditionBinderBuilder(MetadataBinder metadataBinder, T target, ConditionBinderMetadataAction<T> metadataAction, ConditionBinderWidgetAction<T> action)
	{
		binder= metadataBinder;
		this.target= target;
		this.metadataAction= metadataAction;
		this.action= action;
	}

	public void when(ValueModel<Boolean> condition)
	{
		binder.registerDisposableAndUpdateTarget(new ConditionBinding<T>(target, condition, action));
	}

	/**
	 * This method is deprecated, use {@link com.pietschy.gwt.pectin.client.form.metadata.MetadataPlugin#metadataOf(com.pietschy.gwt.pectin.client.form.Field)} instead.
	 * E.g. <pre>binder.show(someWidget).when(metadataOf(someField).isVisible());</pre>
	 * @deprecated use {@link com.pietschy.gwt.pectin.client.form.metadata.MetadataPlugin#metadataOf(com.pietschy.gwt.pectin.client.form.Field)} instead.
	 * E.g. <pre>binder.show(someWidget).when(metadataOf(someField).isVisible());</pre>
	 * @param field the field of interest.
	 */
	@Deprecated
	public void usingMetadataOf(Field field)
	{
		ValueModel<Boolean> condition= metadataAction.getModel(getMetadata(field));
		binder.registerDisposableAndUpdateTarget(new ConditionBinding<T>(target, condition, metadataAction));
	}

	private class ConditionBinding<T> extends AbstractValueBinding<Boolean>
	{
		private T target;
		private ConditionBinderWidgetAction<T> action;

		private ConditionBinding(T target, ValueModel<Boolean> condition, ConditionBinderWidgetAction<T> action)
		{
			super(condition);
			this.target= target;
			this.action= action;
		}

		@Override
		protected void updateTarget(Boolean value)
		{
			action.apply(target, value != null ? value : false);
		}

		@Override
		public T getTarget()
		{
			return target;
		}
	}

}