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/*******************************************************************************
 * Copyright (c) 2011 Formal Mind GmbH and University of Dusseldorf.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Michael Jastram - initial API and implementation
 *     Kay Münch       - vertical alignment of the spec objects id
 ******************************************************************************/

package org.eclipse.rmf.pror.reqif10.presentation.id.provider;


import java.util.Collection;
import java.util.List;

import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CompoundCommand;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.ResourceLocator;
import org.eclipse.emf.ecore.util.EContentAdapter;
import org.eclipse.emf.edit.command.SetCommand;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.provider.ComposeableAdapterFactory;
import org.eclipse.emf.edit.provider.IEditingDomainItemProvider;
import org.eclipse.emf.edit.provider.IItemLabelProvider;
import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
import org.eclipse.emf.edit.provider.IItemPropertySource;
import org.eclipse.emf.edit.provider.IStructuredItemContentProvider;
import org.eclipse.emf.edit.provider.ITreeItemContentProvider;
import org.eclipse.emf.edit.provider.ItemPropertyDescriptor;
import org.eclipse.emf.edit.provider.ViewerNotification;
import org.eclipse.rmf.pror.reqif10.presentation.id.IdConfiguration;
import org.eclipse.rmf.pror.reqif10.presentation.id.IdPackage;
import org.eclipse.rmf.reqif10.AttributeValue;
import org.eclipse.rmf.reqif10.AttributeValueString;
import org.eclipse.rmf.reqif10.ReqIF10Package;
import org.eclipse.rmf.reqif10.common.util.ReqIF10Util;
import org.eclipse.rmf.reqif10.pror.configuration.ConfigurationPackage;
import org.eclipse.rmf.reqif10.pror.configuration.ProrPresentationConfiguration;
import org.eclipse.rmf.reqif10.pror.configuration.provider.ProrPresentationConfigurationItemProvider;

/**
 * This is the item provider adapter for a {@link org.eclipse.rmf.pror.reqif10.presentation.id.IdConfiguration} object.
 * <!-- begin-user-doc -->
 * <!-- end-user-doc -->
 * @generated
 */
public class IdConfigurationItemProvider
	extends ProrPresentationConfigurationItemProvider
	implements
		IEditingDomainItemProvider,
		IStructuredItemContentProvider,
		ITreeItemContentProvider,
		IItemLabelProvider,
		IItemPropertySource {
	/**
	 * This constructs an instance from a factory and a notifier.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public IdConfigurationItemProvider(AdapterFactory adapterFactory) {
		super(adapterFactory);
	}

	/**
	 * This returns the property descriptors for the adapted class.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public List<IItemPropertyDescriptor> getPropertyDescriptors(Object object) {
		if (itemPropertyDescriptors == null) {
			super.getPropertyDescriptors(object);

			addPrefixPropertyDescriptor(object);
			addCountPropertyDescriptor(object);
			addVerticalAlignPropertyDescriptor(object);
		}
		return itemPropertyDescriptors;
	}

	/**
	 * This adds a property descriptor for the Prefix feature.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected void addPrefixPropertyDescriptor(Object object) {
		itemPropertyDescriptors.add
			(createItemPropertyDescriptor
				(((ComposeableAdapterFactory)adapterFactory).getRootAdapterFactory(),
				 getResourceLocator(),
				 getString("_UI_IdConfiguration_prefix_feature"),
				 getString("_UI_PropertyDescriptor_description", "_UI_IdConfiguration_prefix_feature", "_UI_IdConfiguration_type"),
				 IdPackage.Literals.ID_CONFIGURATION__PREFIX,
				 true,
				 false,
				 false,
				 ItemPropertyDescriptor.GENERIC_VALUE_IMAGE,
				 null,
				 null));
	}

	/**
	 * This adds a property descriptor for the Count feature.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected void addCountPropertyDescriptor(Object object) {
		itemPropertyDescriptors.add
			(createItemPropertyDescriptor
				(((ComposeableAdapterFactory)adapterFactory).getRootAdapterFactory(),
				 getResourceLocator(),
				 getString("_UI_IdConfiguration_count_feature"),
				 getString("_UI_PropertyDescriptor_description", "_UI_IdConfiguration_count_feature", "_UI_IdConfiguration_type"),
				 IdPackage.Literals.ID_CONFIGURATION__COUNT,
				 true,
				 false,
				 false,
				 ItemPropertyDescriptor.INTEGRAL_VALUE_IMAGE,
				 null,
				 null));
	}

	/**
	 * This adds a property descriptor for the Vertical Align feature.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	protected void addVerticalAlignPropertyDescriptor(Object object) {
		itemPropertyDescriptors.add
			(createItemPropertyDescriptor
				(((ComposeableAdapterFactory)adapterFactory).getRootAdapterFactory(),
				 getResourceLocator(),
				 getString("_UI_IdConfiguration_verticalAlign_feature"),
				 getString("_UI_PropertyDescriptor_description", "_UI_IdConfiguration_verticalAlign_feature", "_UI_IdConfiguration_type"),
				 IdPackage.Literals.ID_CONFIGURATION__VERTICAL_ALIGN,
				 true,
				 false,
				 false,
				 ItemPropertyDescriptor.GENERIC_VALUE_IMAGE,
				 null,
				 null));
	}

	/**
	 * This returns IdConfiguration.gif.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated NOT
	 */
	@Override
	public Object getImage(Object object) {
		return super.getImage(object);
	}

	/**
	 * This returns the label text for the adapted class.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated NOT
	 */
	@Override
	public String getText(Object object) {
		IdConfiguration idConfiguration = (IdConfiguration)object;
		if (idConfiguration.getDatatype() == null) 
			return getString("_UI_IdConfiguration_type_not_set");
		return getString("_UI_IdConfiguration_type", new Object[] {
				idConfiguration.getDatatype().getLongName(),
				idConfiguration.getCount() });
	}

	/**
	 * This handles model notifications by calling {@link #updateChildren} to update any cached
	 * children and by creating a viewer notification, which it passes to {@link #fireNotifyChanged}.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public void notifyChanged(Notification notification) {
		updateChildren(notification);

		switch (notification.getFeatureID(IdConfiguration.class)) {
			case IdPackage.ID_CONFIGURATION__PREFIX:
			case IdPackage.ID_CONFIGURATION__COUNT:
			case IdPackage.ID_CONFIGURATION__VERTICAL_ALIGN:
				fireNotifyChanged(new ViewerNotification(notification, notification.getNotifier(), false, true));
				return;
		}
		super.notifyChanged(notification);
	}

	/**
	 * This adds {@link org.eclipse.emf.edit.command.CommandParameter}s describing the children
	 * that can be created under this object.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	protected void collectNewChildDescriptors(Collection<Object> newChildDescriptors, Object object) {
		super.collectNewChildDescriptors(newChildDescriptors, object);
	}

	/**
	 * Return the resource locator for this item provider's resources.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public ResourceLocator getResourceLocator() {
		return IDEditPlugin.INSTANCE;
	}

	// Listener to be attached to the ReqIF
	private EContentAdapter contentAdapter;

	/**
	 * We do two things:
	 * <ul>
	 * <li>Register an adapter with the model to set IDs as needed
	 * <li>Register an adapter with the config element to react to config value
	 * changes.
	 * <ul>
	 */
	public void registerPresentationConfiguration(
			final ProrPresentationConfiguration config,
			final EditingDomain editingDomain) {
		registerModelListener((IdConfiguration) config, editingDomain);

		config.eAdapters().add(new AdapterImpl() {
			public void notifyChanged(Notification notification) {
				if (notification.getFeature() == ConfigurationPackage.Literals.PROR_PRESENTATION_CONFIGURATION__DATATYPE) {
					unregisterModelListener(config);
					registerModelListener((IdConfiguration) config,
							editingDomain);
				}
			}
		});
	}

	public void unregisterPresentationConfiguration(
			ProrPresentationConfiguration config) {
		unregisterModelListener(config);
	}

	private void registerModelListener(final IdConfiguration config,
			final EditingDomain editingDomain) {
		if (contentAdapter != null) {
			throw new IllegalStateException(
					"Cannot register IDConfigAdapter without unregistering first!");
		}
		contentAdapter = new EContentAdapter() {
			@Override
			public void setTarget(final Notifier target) {
				super.setTarget(target);
				if (target instanceof AttributeValueString) {
					AttributeValueString value = (AttributeValueString) target;
					if (value.getDefinition() != null
							&& value.getDefinition().getType() != null
							&& value.getDefinition().getType()
									.equals(config.getDatatype())) {
						if (value.getTheValue() == null
								|| value.getTheValue().length() == 0) {
							int newCount = config.getCount() + 1;

							String label = "Assigning ID " + config.getPrefix()
									+ newCount;

							// Catch undo
							Command redoCommand = editingDomain
									.getCommandStack().getRedoCommand();
							if (redoCommand != null
									&& label.equals(redoCommand.getLabel())) {
								System.out.println("Detected Undo - skip "
										+ label);
								return;
							}
							CompoundCommand cmd = new CompoundCommand(
									label);
							cmd.append(SetCommand
									.create(editingDomain,
											value,
											ReqIF10Package.Literals.ATTRIBUTE_VALUE_STRING__THE_VALUE,
											config.getPrefix() + newCount));
							cmd.append(SetCommand.create(editingDomain, config,
									IdPackage.Literals.ID_CONFIGURATION__COUNT,
									newCount));
							editingDomain.getCommandStack().execute(cmd);
						}
					}
				}
			}
		};
		ReqIF10Util.getReqIF(config).getCoreContent().eAdapters()
				.add(contentAdapter);
	}

	private void unregisterModelListener(ProrPresentationConfiguration config) {
		if (contentAdapter != null) {
			ReqIF10Util.getReqIF(config).getCoreContent().eAdapters()
					.remove(contentAdapter);
			contentAdapter = null;
		}
	}

	public Command handleDragAndDrop(Collection<?> source, Object target,
			EditingDomain editingDomain, int operation) {
		// No drag and drop support
		return null;
	}

	public String getLabel(AttributeValue av) {
		// No custom label
		return null;
	}

	/**
	 * Don't allow editing.
	 */
	public boolean canEdit() {
		return false;
	}

}

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