/*******************************************************************************
 * Copyright (c) 2005-2008 Polarion Software.
 * 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:
 *    Alexander Gurov - Initial API and implementation
 *******************************************************************************/

package org.eclipse.team.svn.ui.action.local;

import org.eclipse.core.resources.IResource;
import org.eclipse.jface.action.IAction;
import org.eclipse.team.svn.core.extension.CoreExtensionsManager;
import org.eclipse.team.svn.core.extension.factory.ISVNConnectorFactory;
import org.eclipse.team.svn.core.operation.CompositeOperation;
import org.eclipse.team.svn.core.operation.IActionOperation;
import org.eclipse.team.svn.core.resource.ILocalResource;
import org.eclipse.team.svn.core.resource.IRepositoryResource;
import org.eclipse.team.svn.core.svnstorage.SVNRemoteStorage;
import org.eclipse.team.svn.core.utility.SVNUtility;
import org.eclipse.team.svn.ui.SVNTeamUIPlugin;
import org.eclipse.team.svn.ui.action.AbstractWorkingCopyAction;
import org.eclipse.team.svn.ui.dialog.DefaultDialog;
import org.eclipse.team.svn.ui.history.ISVNHistoryView;
import org.eclipse.team.svn.ui.operation.CompareResourcesOperation;
import org.eclipse.team.svn.ui.operation.ShowHistoryViewOperation;
import org.eclipse.team.svn.ui.panel.remote.ComparePanel;
import org.eclipse.team.svn.ui.preferences.SVNTeamPreferences;

/**
 * Compare menu "compare with selected revision" action implementation
 * 
 * @author Alexander Gurov
 */
public class CompareWithRevisionAction extends AbstractWorkingCopyAction {

	public CompareWithRevisionAction() {
		super();
	}
	
	public void runImpl(IAction action) {
		IResource resource = this.getSelectedResources()[0];
		ILocalResource local = SVNRemoteStorage.instance().asLocalResourceAccessible(resource);
		IRepositoryResource remote = local.isCopied() ? SVNUtility.getCopiedFrom(resource) : SVNRemoteStorage.instance().asRepositoryResource(resource);

		ComparePanel panel = new ComparePanel(remote, local.getRevision());
		DefaultDialog dialog = new DefaultDialog(this.getShell(), panel);
		if (dialog.open() == 0) {
			remote = panel.getSelectedResource();
			String diffFile = panel.getDiffFile();
			CompareResourcesOperation mainOp = new CompareResourcesOperation(local, remote);
			mainOp.setDiffFile(diffFile);
			CompositeOperation op = new CompositeOperation(mainOp.getId());
			op.add(mainOp);
			if (SVNTeamPreferences.getHistoryBoolean(SVNTeamUIPlugin.instance().getPreferenceStore(), SVNTeamPreferences.HISTORY_CONNECT_TO_COMPARE_WITH_NAME)) {
				op.add(new ShowHistoryViewOperation(resource, remote, ISVNHistoryView.COMPARE_MODE, ISVNHistoryView.COMPARE_MODE), new IActionOperation[] {mainOp});
			}
			this.runScheduled(op);
		}
	}

	public boolean isEnabled() {
		boolean isCompareFoldersAllowed = CoreExtensionsManager.instance().getSVNConnectorFactory().getSVNAPIVersion() == ISVNConnectorFactory.APICompatibility.SVNAPI_1_5_x;
		return 
			this.getSelectedResources().length == 1 && 
			(isCompareFoldersAllowed || this.getSelectedResources()[0].getType() == IResource.FILE) && 
			this.checkForResourcesPresence(CompareWithWorkingCopyAction.COMPARE_FILTER);
	}

	protected boolean needsToSaveDirtyEditors() {
		return true;
	}
	
}