/*******************************************************************************
 * Copyright (c) 2006 IBM Corporation and others.
 * 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:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.internal.core.history;

import java.net.URI;

import org.eclipse.core.filesystem.URIUtil;
import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.osgi.util.NLS;
import org.eclipse.team.core.history.IFileRevision;
import org.eclipse.team.core.history.ITag;
import org.eclipse.team.core.history.provider.FileRevision;
import org.eclipse.team.internal.core.Messages;

/**
 * A LocalFileRevision is used for wrapping local files in order to display
 * them in the History View. As such, this class can be used to wrap either 
 * a local file's IFileState or an IFile. 
 */
public class LocalFileRevision extends FileRevision {
	/*
	 * Either one or the other of these fields is intended
	 * to be used.
	 */
	//Used for wrapping local file history items
	private IFileState state;

	//Used for displaying the "real" current file
	private IFile file;
	//Used for displaying which base revision 
	private IFileRevision baseRevision;

	/*
	 * Used for wrapping an IFileState.
	 */
	public LocalFileRevision(IFileState state) {
		this.state = state;
		this.file = null;
		this.baseRevision = null;
	}

	/*
	 * Used for wrapping an IFile. This is generally used to represent the local
	 * current version of the file being displayed in the history. Make sure to
	 * also pass in the base revision associated with this current version. 
	 * 
	 * @see #setBaseRevision(IFileRevision)
	 */
	public LocalFileRevision(IFile file) {
		this.file = file;
		this.baseRevision = null;
		this.state = null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.team.internal.core.FileRevision#getContentIdentifier()
	 */
	public String getContentIdentifier() {
		if (file != null)
			return baseRevision == null ?  NLS.bind(Messages.LocalFileRevision_currentVersion, "") : NLS.bind(Messages.LocalFileRevision_currentVersion, baseRevision.getContentIdentifier()); //$NON-NLS-1$
		return ""; //$NON-NLS-1$
	}

	/* (non-Javadoc)
	 * @see org.eclipse.team.internal.core.FileRevision#getAuthor()
	 */
	public String getAuthor() {
		return ""; //$NON-NLS-1$
	}

	/* (non-Javadoc)
	 * @see org.eclipse.team.internal.core.FileRevision#getComment()
	 */
	public String getComment() {
		if (file != null)
			return Messages.LocalFileRevision_currentVersionTag;
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.team.internal.core.FileRevision#getTags()
	 */
	public ITag[] getTags() {
		return new ITag[0];
	}

	/* (non-Javadoc)
	 * @see org.eclipse.team.core.history.IFileState#getStorage(org.eclipse.core.runtime.IProgressMonitor)
	 */
	public IStorage getStorage(IProgressMonitor monitor) throws CoreException {
		if (file != null) {
			return file;
		}
		return state;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.team.core.history.IFileState#getName()
	 */
	public String getName() {
		if (file != null) {
			return file.getName();
		}

		return state.getName();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.team.core.variants.FileState#getTimestamp()
	 */
	public long getTimestamp() {
		if (file != null) {
			return file.getLocalTimeStamp();
		}

		return state.getModificationTime();
	}

	/*
	 * Sets the base revision. Can be used to associate a base revision
	 * with an IFile.
	 */
	public void setBaseRevision(IFileRevision baseRevision) {
		this.baseRevision = baseRevision;
	}
	
	public boolean isPropertyMissing() {
		return true;
	}

	
	public IFileRevision withAllProperties(IProgressMonitor monitor) {
		return this;
	}

	public boolean isPredecessorOf(IFileRevision revision) {
		long compareRevisionTime = revision.getTimestamp();
		return (this.getTimestamp() < compareRevisionTime);
	}

	public boolean isDescendentOf(IFileRevision revision) {
		long compareRevisionTime = revision.getTimestamp();
		return (this.getTimestamp() > compareRevisionTime);
	}
	
	public URI getURI() {
		if (file != null)
			return file.getLocationURI();
		
		return URIUtil.toURI(state.getFullPath());
	}
}
