EDIT

// $Id$

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy 

* http://www.e-taxonomy.eu

* 

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.editor;

import java.util.HashSet;

import java.util.Set;

import java.util.UUID;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.ui.IEditorInput;

import org.eclipse.ui.IEditorPart;

import org.eclipse.ui.IMemento;

import org.eclipse.ui.IPersistable;

import org.eclipse.ui.PartInitException;

import eu.etaxonomy.taxeditor.editor.view.concept.ConceptViewPart;

import eu.etaxonomy.taxeditor.editor.view.descriptive.DescriptiveViewPart;

import eu.etaxonomy.taxeditor.editor.view.media.MediaViewPart;

import eu.etaxonomy.taxeditor.model.ContextListenerAdapter;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.view.AbstractCdmEditorViewPart;

/**

 * <p>EditorStateManager class.</p>

 *

 * @author n.hoffmann

 * @created Sep 30, 2010

 * @version 1.0

 */

public class EditorStateManager extends ContextListenerAdapter {

	private static final String EDITORS = "editors";

	private static final String EDITOR = "editor";

	private TaxonEditorInputFactory inputFactory;

	/**

	 * <p>Constructor for EditorStateManager.</p>

	 */

	public EditorStateManager() {

		inputFactory = new TaxonEditorInputFactory();

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.model.IContextListener#contextAboutToStop(org.eclipse.ui.IMemento, org.eclipse.core.runtime.IProgressMonitor)

	 */

	/** {@inheritDoc} */

	@Override

	public void contextAboutToStop(IMemento memento, IProgressMonitor monitor) {

		saveEditorState(memento);

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.model.ContextListenerAdapter#contextStop(org.eclipse.ui.IMemento, org.eclipse.core.runtime.IProgressMonitor)

	 */

	/** {@inheritDoc} */

	@Override

	public void contextStop(IMemento memento, IProgressMonitor monitor) {

		EditorUtil.closeAll();

		resetConstantViews();

	}

	/**

	 * 

	 */

	private void resetConstantViews() {

		AbstractCdmEditorViewPart descriptiveView = (AbstractCdmEditorViewPart) EditorUtil.getView(DescriptiveViewPart.ID, false);

		AbstractCdmEditorViewPart mediaView = (AbstractCdmEditorViewPart) EditorUtil.getView(MediaViewPart.ID, false);

		AbstractCdmEditorViewPart conceptView = (AbstractCdmEditorViewPart) EditorUtil.getView(ConceptViewPart.ID, false);

		if(descriptiveView != null){

			descriptiveView.showEmptyPage();

		}

		if(mediaView != null){

			mediaView.showEmptyPage();

		}

		if(conceptView != null){

			conceptView.showEmptyPage();

		}

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.model.IContextListener#contextStart(org.eclipse.ui.IMemento, org.eclipse.core.runtime.IProgressMonitor)

	 */

	/** {@inheritDoc} */

	@Override

	public void contextStart(IMemento memento, IProgressMonitor monitor) {

		restoreEditors(memento, monitor);

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.model.ContextListenerAdapter#contextRefresh(org.eclipse.core.runtime.IProgressMonitor)

	 */

	@Override

	public void contextRefresh(IProgressMonitor monitor) {

		refreshEditors(monitor);

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.model.ContextListenerAdapter#workbenchShutdown(org.eclipse.ui.IMemento, org.eclipse.core.runtime.IProgressMonitor)

	 */

	/** {@inheritDoc} */

	@Override

	public void workbenchShutdown(IMemento memento, IProgressMonitor monitor) {

		saveEditorState(memento);

	}

	/**

	 * Reads taxon node UUIDs from the given memento and tries to open an editor 

	 * for each of the found UUIDs.

	 * 

	 * @param memento

	 */

	private void restoreEditors(final IMemento memento, IProgressMonitor monitor){

		if(memento == null){

			return;

		}

		IProgressMonitor subProgressMonitor = EditorUtil.getSubProgressMonitor(monitor, 1);

		IMemento editorMementos = memento.getChild(EDITORS);

		IMemento[] editorInputs = editorMementos.getChildren(EDITOR);

		subProgressMonitor.beginTask("Restoring Editors", 1 + editorInputs.length * 2);

		subProgressMonitor.subTask("Restoring Editors");

		subProgressMonitor.worked(1);

		for(IMemento editorInput : editorInputs){

			TaxonEditorInput input = (TaxonEditorInput) inputFactory.createElement(editorInput);

			subProgressMonitor.worked(1);

			if(!subProgressMonitor.isCanceled() && input != null){

				try {

					EditorUtil.open(input);

				} catch (PartInitException e) {

					MessagingUtils.error(getClass(), "Error opening an editor window", e);

				}

			}

			subProgressMonitor.worked(1);

		}

		subProgressMonitor.done();

	}

	/**

	 * @param monitor

	 */

	private void refreshEditors(IProgressMonitor monitor) {

		IProgressMonitor subProgressMonitor = EditorUtil.getSubProgressMonitor(monitor, 1);

		Set<IEditorPart> openEditors = EditorUtil.getOpenEditors();

		subProgressMonitor.beginTask("Refreshing Editors", openEditors.size() * 2);

		Set<UUID> uuids = new HashSet<UUID>();

		for(IEditorPart editor : openEditors){

			if(editor instanceof MultiPageTaxonEditor){

				try {

					uuids.add(((TaxonEditorInput) editor.getEditorInput()).getTaxonNode().getUuid());

//					((MultiPageTaxonEditor) editor).close(false);

					EditorUtil.close((MultiPageTaxonEditor)editor);

					subProgressMonitor.worked(1);

				} catch (Exception e) {

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

			}

		}

		for(UUID uuid : uuids){

			try {

				EditorUtil.openTaxonNode(uuid);

			} catch (Exception e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

			subProgressMonitor.worked(1);

		}

		subProgressMonitor.done();

	}

	/**

	 * Saves the UUIDs 

	 * 

	 * @param memento

	 */

	private void saveEditorState(IMemento memento){

		if(memento == null){

			return;

		}

		Set<IEditorPart> editors = EditorUtil.getOpenEditors();

		IMemento editorMementos = memento.createChild(EDITORS);

		for(IEditorPart editor : editors){

			IEditorInput input = editor.getEditorInput();

			if(input instanceof IPersistable){

				IMemento editorMemento = editorMementos.createChild(EDITOR);

				((IPersistable) input).saveState(editorMemento);

			}

		}

	}

}