/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.ui.synchronize;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IResource;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.team.internal.ui.Policy;
import org.eclipse.team.internal.ui.Utils;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.IWorkingSetManager;
import org.eclipse.ui.PlatformUI;

/**
 * A synchronize scope whose roots are defined by a working set.
 * <p>
 * Clients are not expected to subclass this class.
 * @since 3.0
 */
public class WorkingSetScope extends AbstractSynchronizeScope implements IPropertyChangeListener {
	
	/*
	 * Constants used to save and restore this scope
	 */
	/*
	 * Constants used to save and restore this scope
	 */
	private final static String CTX_SETS = "workingset_scope_sets"; //$NON-NLS-1$
	private final static String CTX_SET_NAME = "workingset_scope_name"; //$NON-NLS-1$
	
	private IWorkingSet[] sets;
	
	/**
	 * Create the scope for the subscriber and working set
	 * @param subscriber the subscriber that defines this scope
	 * @param set the working set that defines this scope
	 */
	public WorkingSetScope(IWorkingSet[] sets) {
		this.sets = sets;
		PlatformUI.getWorkbench().getWorkingSetManager().addPropertyChangeListener(this);
	}
	
	/** 
	 * Create this scope from it's previously saved state
	 * @param memento
	 */
	protected WorkingSetScope(IMemento memento) {
		super(memento);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.team.internal.ui.synchronize.ScopableSubscriberParticipant.SubscriberScope#getName()
	 */
	public String getName() {
		if (sets.length == 0) {
			return Policy.bind("WorkingSetScope.0"); //$NON-NLS-1$
		}
		StringBuffer name = new StringBuffer();
		for (int i = 0; i < sets.length; i++) {
			IWorkingSet set = sets[i];
			name.append(set.getName());
			if (i < sets.length - 1) {
				name.append(", ");
			}
		}
		return name.toString();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.team.internal.ui.synchronize.ScopableSubscriberParticipant.SubscriberScope#getRoots()
	 */
	public IResource[] getRoots() {
		if (sets.length == 0) {
			return null;
		}
		HashSet roots = new HashSet();
		for (int i = 0; i < sets.length; i++) {
			IWorkingSet set = sets[i];
			IResource[] resources = Utils.getResources(set.getElements());
			addNonOverlapping(roots, resources);
	}
		return (IResource[]) roots.toArray(new IResource[roots.size()]);
	}
	
	private void addNonOverlapping(HashSet roots, IResource[] resources) {
		for (int i = 0; i < resources.length; i++) {
			IResource newResource = resources[i];
			boolean add = true;
			for (Iterator iter = roots.iterator(); iter.hasNext();) {
				IResource existingResource = (IResource) iter.next();
				if (existingResource.equals(newResource)) {
					// No need to add it since it is already there
					add = false;
					break;
				}
				if (existingResource.getFullPath().isPrefixOf(newResource.getFullPath())) {
					// No need to add it since a parent is already there
					add = false;
					break;
				}
				if (newResource.getFullPath().isPrefixOf(existingResource.getFullPath())) {
					// Remove existing and continue
					iter.remove();
				}
			}
			if (add) {
				roots.add(newResource);
			}
		}
		
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
	 */
	public void propertyChange(PropertyChangeEvent event) {
		if (event.getProperty() == IWorkingSetManager.CHANGE_WORKING_SET_CONTENT_CHANGE) {
			IWorkingSet newSet = (IWorkingSet)event.getNewValue();
			for (int i = 0; i < sets.length; i++) {
				IWorkingSet set = sets[i];
			if (newSet == set) {
				fireRootsChanges();
					return;
			}
		}
	}
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.team.internal.ui.synchronize.ScopableSubscriberParticipant.SubscriberScope#dispose()
	 */
	public void dispose() {
		super.dispose();
		PlatformUI.getWorkbench().getWorkingSetManager().removePropertyChangeListener(this);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.team.ui.synchronize.AbstractSynchronizeScope#saveState(org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento memento) {
		super.saveState(memento);
		for (int i = 0; i < sets.length; i++) {
			IWorkingSet set = sets[i];
			IMemento rootNode = memento.createChild(CTX_SETS);
			rootNode.putString(CTX_SET_NAME, set.getName());
		}
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.team.ui.synchronize.AbstractSynchronizeScope#init(org.eclipse.ui.IMemento)
	 */
	protected void init(IMemento memento) {
		super.init(memento);
		IMemento[] rootNodes = memento.getChildren(CTX_SETS);
		if(rootNodes != null) {
			List sets = new ArrayList();
			for (int i = 0; i < rootNodes.length; i++) {
				IMemento rootNode = rootNodes[i];
				String setName = rootNode.getString(CTX_SET_NAME);
				IWorkingSet set = PlatformUI.getWorkbench().getWorkingSetManager().getWorkingSet(setName);
				if (set != null) {
					sets.add(set);
		}
	}
			this.sets = (IWorkingSet[]) sets.toArray(new IWorkingSet[sets.size()]);
}	}
}