/*******************************************************************************
 * Copyright (c) 2006 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.internal.ccvs.ui.mappings;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.*;
import org.eclipse.osgi.util.NLS;
import org.eclipse.team.core.diff.IDiff;
import org.eclipse.team.core.diff.IThreeWayDiff;
import org.eclipse.team.core.history.IFileRevision;
import org.eclipse.team.core.mapping.ISynchronizationScopeManager;
import org.eclipse.team.core.mapping.provider.ResourceDiffTree;
import org.eclipse.team.core.subscribers.Subscriber;
import org.eclipse.team.core.variants.IResourceVariant;
import org.eclipse.team.internal.ccvs.core.*;
import org.eclipse.team.internal.ccvs.core.resources.CVSWorkspaceRoot;
import org.eclipse.team.internal.ccvs.core.syncinfo.*;
import org.eclipse.team.internal.ccvs.ui.CVSUIMessages;
import org.eclipse.team.internal.ui.Utils;

public class MergeSubscriberContext extends CVSSubscriberMergeContext {

	public static MergeSubscriberContext createContext(ISynchronizationScopeManager manager, Subscriber subscriber) {
		MergeSubscriberContext mergeContext = new MergeSubscriberContext(subscriber, manager);
		mergeContext.initialize();
		return mergeContext;
	}

	private boolean cancel = true;
	
	public MergeSubscriberContext(Subscriber subscriber, ISynchronizationScopeManager manager) {
		super(subscriber, manager);
	}

	@Override
	public void markAsMerged(final IDiff diff, boolean inSyncHint, IProgressMonitor monitor) throws CoreException {
		run(monitor1 -> ((CVSMergeSubscriber) getSubscriber())
				.merged(new IResource[] { getDiffTree().getResource(diff) }), getMergeRule(diff), IResource.NONE,
				monitor);
	}
	
	@Override
	public void markAsMerged(final IDiff[] diffs, boolean inSyncHint, IProgressMonitor monitor) throws CoreException {
		run(monitor1 -> {
			List<IResource> result = new ArrayList<>();
			for (int i = 0; i < diffs.length; i++) {
				IDiff diff = diffs[i];
				result.add(getDiffTree().getResource(diff));
			}
			((CVSMergeSubscriber) getSubscriber()).merged(result.toArray(new IResource[result.size()]));
		}, getMergeRule(diffs), IResource.NONE, monitor);
	}
	
	@Override
	public void dispose() {
		if (cancel)
			((CVSMergeSubscriber)getSubscriber()).cancel();
		super.dispose();
	}

	public void setCancelSubscriber(boolean b) {
		cancel  = b;
	}
	
	@Override
	public IStatus merge(final IDiff diff, final boolean ignoreLocalChanges, IProgressMonitor monitor) throws CoreException {
		final IStatus[] status = new IStatus[] { Status.OK_STATUS };
		run(monitor1 -> {
			IThreeWayDiff currentDiff = (IThreeWayDiff) getSubscriber().getDiff(getDiffTree().getResource(diff));
			if (!MergeSubscriberContext.this.equals(currentDiff, (IThreeWayDiff) diff)) {
				throw new CVSException(NLS.bind(CVSUIMessages.CVSMergeContext_1, diff.getPath()));
			}
			status[0] = MergeSubscriberContext.super.merge(diff, ignoreLocalChanges, monitor1);
			if (status[0].isOK()) {
				IResource resource = ResourceDiffTree.getResourceFor(diff);
				if (resource.getType() == IResource.FILE && resource.exists() && diff instanceof IThreeWayDiff) {
					IThreeWayDiff twd = (IThreeWayDiff) diff;
					if (twd.getKind() == IDiff.ADD && twd.getDirection() == IThreeWayDiff.INCOMING) {
						IFileRevision remote = Utils.getRemote(diff);
						IResourceVariant variant = Adapters.adapt(remote, IResourceVariant.class);
						byte[] syncBytes = variant.asBytes();
						MutableResourceSyncInfo info = new MutableResourceSyncInfo(resource.getName(),
								ResourceSyncInfo.ADDED_REVISION);
						info.setKeywordMode(ResourceSyncInfo.getKeywordMode(syncBytes));
						info.setTag(getTag(resource.getParent()));
						CVSWorkspaceRoot.getCVSFileFor((IFile) resource).setSyncInfo(info, ICVSFile.DIRTY);
					}
				}
			}
		}, getMergeRule(diff), IWorkspace.AVOID_UPDATE, monitor);
		return status[0];
	}

	CVSTag getTag(IContainer parent) throws CVSException {
		ICVSFolder folder = CVSWorkspaceRoot.getCVSFolderFor(parent);
		FolderSyncInfo info = folder.getFolderSyncInfo();
		if (info != null)
			return info.getTag();
		return null;
	}
	
	boolean equals(IThreeWayDiff currentDiff, IThreeWayDiff diffTreeDiff) {
		return currentDiff != null 
			&& currentDiff.getKind() == diffTreeDiff.getKind() 
			&& currentDiff.getDirection() == diffTreeDiff.getDirection();
	}
}