/*******************************************************************************
 * Copyright (c) 2002 IBM Corporation and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Common Public License v0.5
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v05.html
 * 
 * Contributors:
 * IBM - Initial implementation
 ******************************************************************************/
package org.eclipse.team.internal.ccvs.ui.actions;

import java.lang.reflect.InvocationTargetException;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.internal.ccvs.core.CVSException;
import org.eclipse.team.internal.ccvs.core.CVSTag;
import org.eclipse.team.internal.ccvs.core.CVSTeamProvider;
import org.eclipse.team.internal.ccvs.core.ICVSFile;
import org.eclipse.team.internal.ccvs.core.ICVSFolder;
import org.eclipse.team.internal.ccvs.core.ICVSRepositoryLocation;
import org.eclipse.team.internal.ccvs.core.ICVSResource;
import org.eclipse.team.internal.ccvs.core.resources.CVSWorkspaceRoot;
import org.eclipse.team.internal.ccvs.core.syncinfo.FolderSyncInfo;
import org.eclipse.team.internal.ccvs.core.syncinfo.ResourceSyncInfo;
import org.eclipse.team.internal.ccvs.ui.BranchPromptDialog;
import org.eclipse.team.internal.ccvs.ui.CVSUIPlugin;
import org.eclipse.team.internal.ccvs.ui.Policy;
import org.eclipse.team.internal.ccvs.ui.RepositoryManager;

/**
 * BranchAction tags the selected resources with a branch tag specified by the user,
 * and optionally updates the local resources to point to the new branch.
 */
public class BranchAction extends CVSAction {

	/*
	 * @see CVSAction#execute()
	 */
	public void execute(IAction action) {
		final Shell shell = getShell();
		final IResource[] resources = getSelectedResources();
		boolean allSticky = areAllResourcesSticky(resources);

		ICVSFolder folder = CVSWorkspaceRoot.getCVSFolderFor(resources[0].getProject());
		final BranchPromptDialog dialog = new BranchPromptDialog(getShell(),
											Policy.bind("BranchWizard.title"), //$NON-NLS-1$
											folder, 
											allSticky, 
											calculateInitialVersionName(resources,allSticky));
		
		if (dialog.open() != InputDialog.OK) return;		
		
		run(new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
				try {
					String tagString = dialog.getBranchTagName();
					boolean update = dialog.getUpdate();
					String versionString = dialog.getVersionTagName();
					CVSTag rootVersionTag = null;
					final CVSTag branchTag = new CVSTag(tagString, CVSTag.BRANCH);
					if (versionString != null) {
						rootVersionTag = new CVSTag(versionString, CVSTag.VERSION);
					}
											
					// For non-projects determine if the tag being loaded is the same as the resource's parent
					// If it's not, warn the user that they will have strange sync behavior
					if (update) {
						if(!CVSAction.checkForMixingTags(getShell(), resources, branchTag)) {
							return;
						}
					}
									
					RepositoryManager manager = CVSUIPlugin.getPlugin().getRepositoryManager();
					Hashtable table = getProviderMapping(resources);
					Set keySet = table.keySet();
					monitor.beginTask("", keySet.size() * 1000); //$NON-NLS-1$
					MultiStatus status = new MultiStatus(CVSUIPlugin.ID, IStatus.INFO, Policy.bind("BranchWizard.errorBranching"), null); //$NON-NLS-1$
					Iterator iterator = keySet.iterator();
					while (iterator.hasNext()) {
						IProgressMonitor subMonitor = new SubProgressMonitor(monitor, 1000);
						CVSTeamProvider provider = (CVSTeamProvider)iterator.next();
						List list = (List)table.get(provider);
						IResource[] providerResources = (IResource[])list.toArray(new IResource[list.size()]);											
						ICVSRepositoryLocation root = provider.getCVSWorkspaceRoot().getRemoteLocation();
						try {
							if (!areAllResourcesSticky(resources)) {													
								// version everything in workspace with the root version tag specified in dialog
								provider.makeBranch(providerResources, rootVersionTag, branchTag, update, true, subMonitor);
							} else {
								// all resources are versions, use that version as the root of the branch
								provider.makeBranch(providerResources, null, branchTag, update, true, subMonitor);										
							}
							if (rootVersionTag != null || update) {
								for (int i = 0; i < providerResources.length; i++) {
									ICVSResource cvsResource = CVSWorkspaceRoot.getCVSResourceFor(providerResources[i]);
									if (rootVersionTag != null) {
										manager.addVersionTags(cvsResource, new CVSTag[] { rootVersionTag });
									}
									if (update) {
										manager.addBranchTags(cvsResource, new CVSTag[] { branchTag });
									}
								}
							}
						} catch (TeamException e) {
							status.merge(e.getStatus());
						}
					}
					if (!status.isOK()) {
						throw new InvocationTargetException(new CVSException(status));
					}
				} catch(CVSException e) {
					throw new InvocationTargetException(e);
				}
			}
		}, Policy.bind("BranchWizard.errorBranching"), this.PROGRESS_DIALOG); //$NON-NLS-1$
	}
	
	/*
	 * @see TeamAction#isEnabled()
	 */
	protected boolean isEnabled() {
		try {
			return isSelectionNonOverlapping();
		} catch(TeamException e) {
			CVSUIPlugin.log(e.getStatus());
			return false;
		}
	}
	
	/**
	 * Answers <code>true</code> if all resources in the array have a sticky tag
	 */
	private boolean areAllResourcesSticky(IResource[] resources) {
		for (int i = 0; i < resources.length; i++) {
			if(!hasStickyTag(resources[i])) return false;
		}
		return true;
	}
	
	/**
	 * Answers <code>true</code> if the resource has a sticky tag
	 */
	private boolean hasStickyTag(IResource resource) {
		try {
			ICVSResource cvsResource = CVSWorkspaceRoot.getCVSResourceFor(resource);			
			CVSTag tag;
			if(cvsResource.isFolder()) {
				FolderSyncInfo folderInfo = ((ICVSFolder)cvsResource).getFolderSyncInfo();
				tag = folderInfo.getTag();
			} else {
				ResourceSyncInfo info = cvsResource.getSyncInfo();
				tag = info.getTag();
			}
			if(tag!=null) {
				int tagType = tag.getType();
				if(tagType==tag.VERSION) {
					return true;
				}
			}
		} catch(CVSException e) {
			CVSUIPlugin.log(e.getStatus());
			return false;
		}
		return false;
	}
	
	private String calculateInitialVersionName(IResource[] resources, boolean allSticky) {
		String versionName = "";		 //$NON-NLS-1$
		try {
			if(allSticky) {
				IResource stickyResource = resources[0];									
				if(stickyResource.getType()==IResource.FILE) {
					ICVSFile cvsFile = CVSWorkspaceRoot.getCVSFileFor((IFile)stickyResource);
					versionName = cvsFile.getSyncInfo().getTag().getName();
				} else {
					ICVSFolder cvsFolder = CVSWorkspaceRoot.getCVSFolderFor((IContainer)stickyResource);
					versionName = cvsFolder.getFolderSyncInfo().getTag().getName();
				}
			}
		} catch(CVSException e) {
			CVSUIPlugin.log(e.getStatus());
			versionName = ""; //$NON-NLS-1$
		}
		return versionName;
	}
}