/*
    * Copyright (C) 2015, Google Inc.
    * and other copyright owners as documented in the project's IP log.
    *
    * This program and the accompanying materials are made available
    * under the terms of the Eclipse Distribution License v1.0 which
    * accompanies this distribution, is reproduced below, and is
    * available at http://www.eclipse.org/org/documents/edl-v10.php
    *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
   *
   * - Redistributions of source code must retain the above copyright
   *   notice, this list of conditions and the following disclaimer.
   *
   * - Redistributions in binary form must reproduce the above
   *   copyright notice, this list of conditions and the following
   *   disclaimer in the documentation and/or other materials provided
   *   with the distribution.
   *
   * - Neither the name of the Eclipse Foundation, Inc. nor the
   *   names of its contributors may be used to endorse or promote
   *   products derived from this software without specific prior
   *   written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package org.eclipse.jgit.gitrepo;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.nio.channels.FileChannel;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.eclipse.jgit.lib.Repository;
  
  /**
   * The representation of a repo sub project.
   *
   * @see <a href="https://code.google.com/p/git-repo/">git-repo project page</a>
   * @since 4.0
   */
  public class RepoProject implements Comparable<RepoProject> {
  	private final String name;
  	private final String path;
  	private final String revision;
  	private final String remote;
  	private final Set<String> groups;
  	private final List<CopyFile> copyfiles;
  	private String url;
  	private String defaultRevision;
  
  	/**
  	 * The representation of a copy file configuration.
  	 */
  	public static class CopyFile {
  		final Repository repo;
  		final String path;
  		final String src;
  		final String dest;
  
  		/**
  		 * @param repo
  		 *            the super project.
  		 * @param path
  		 *            the path of the project containing this copyfile config.
  		 * @param src
  		 *            the source path relative to the sub repo.
  		 * @param dest
  		 *            the destination path relative to the super project.
  		 */
  		public CopyFile(Repository repo, String path, String src, String dest) {
  			this.repo = repo;
  			this.path = path;
  			this.src = src;
  			this.dest = dest;
 		}
 
 		/**
 		 * Do the copy file action.
 		 *
 		 * @throws IOException
 		 */
 		public void copy() throws IOException {
 			File srcFile = new File(repo.getWorkTree(),
 					path + "/" + src); //$NON-NLS-1$
 			File destFile = new File(repo.getWorkTree(), dest);
 			FileInputStream input = new FileInputStream(srcFile);
 			try {
 				FileOutputStream output = new FileOutputStream(destFile);
 				try {
 					FileChannel channel = input.getChannel();
 					output.getChannel().transferFrom(
 							channel, 0, channel.size());
 				} finally {
 					output.close();
 				}
 			} finally {
 				input.close();
 			}
 		}
 	}
 
 	/**
 	 * @param name
 	 *            the relative path to the {@code remote}
 	 * @param path
 	 *            the relative path to the super project
 	 * @param revision
 	 *            a SHA-1 or branch name or tag name
 	 * @param remote
 	 *            name of the remote definition
 	 * @param groups
 	 *            comma separated group list
 	 */
 	public RepoProject(String name, String path, String revision,
 			String remote, String groups) {
 		if (name == null) {
 			throw new NullPointerException();
 		}
 		this.name = name;
 		if (path != null)
 			this.path = path;
 		else
 			this.path = name;
 		this.revision = revision;
 		this.remote = remote;
 		this.groups = new HashSet<String>();
 		if (groups != null && groups.length() > 0)
 			this.groups.addAll(Arrays.asList(groups.split(","))); //$NON-NLS-1$
 		copyfiles = new ArrayList<CopyFile>();
 	}
 
 	/**
 	 * Set the url of the sub repo.
 	 *
 	 * @param url
 	 * @return this for chaining.
 	 */
 	public RepoProject setUrl(String url) {
 		this.url = url;
 		return this;
 	}
 
 	/**
 	 * Set the default revision for the sub repo.
 	 *
 	 * @param defaultRevision
 	 * @return this for chaining.
 	 */
 	public RepoProject setDefaultRevision(String defaultRevision) {
 		this.defaultRevision = defaultRevision;
 		return this;
 	}
 
 	/**
 	 * Get the name (relative path to the {@code remote}) of this sub repo.
 	 *
 	 * @return {@code name}
 	 */
 	public String getName() {
 		return name;
 	}
 
 	/**
 	 * Get the path (relative path to the super project) of this sub repo.
 	 *
 	 * @return {@code path}
 	 */
 	public String getPath() {
 		return path;
 	}
 
 	/**
 	 * Get the revision of the sub repo.
 	 *
 	 * @return {@code revision} if set, or {@code defaultRevision}.
 	 */
 	public String getRevision() {
 		return revision == null ? defaultRevision : revision;
 	}
 
 	/**
 	 * Getter for the copyfile configurations.
 	 *
 	 * @return Immutable copy of {@code copyfiles}
 	 */
 	public List<CopyFile> getCopyFiles() {
 		return Collections.unmodifiableList(copyfiles);
 	}
 
 	/**
 	 * Get the url of the sub repo.
 	 *
 	 * @return {@code url}
 	 */
 	public String getUrl() {
 		return url;
 	}
 
 	/**
 	 * Get the name of the remote definition of the sub repo.
 	 *
 	 * @return {@code remote}
 	 */
 	public String getRemote() {
 		return remote;
 	}
 
 	/**
 	 * Test whether this sub repo belongs to a specified group.
 	 *
 	 * @param group
 	 * @return true if {@code group} is present.
 	 */
 	public boolean inGroup(String group) {
 		return groups.contains(group);
 	}
 
 	/**
 	 * Add a copy file configuration.
 	 *
 	 * @param copyfile
 	 */
 	public void addCopyFile(CopyFile copyfile) {
 		copyfiles.add(copyfile);
 	}
 
 	/**
 	 * Add a bunch of copyfile configurations.
 	 *
 	 * @param copyfiles
 	 */
 	public void addCopyFiles(Collection<CopyFile> copyfiles) {
 		this.copyfiles.addAll(copyfiles);
 	}
 
 	private String getPathWithSlash() {
 		if (path.endsWith("/")) //$NON-NLS-1$
 			return path;
 		else
 			return path + "/"; //$NON-NLS-1$
 	}
 
 	/**
 	 * Check if this sub repo is the ancestor of given sub repo.
 	 *
 	 * @param that
 	 *            non null
 	 * @return true if this sub repo is the ancestor of given sub repo.
 	 */
 	public boolean isAncestorOf(RepoProject that) {
 		return that.getPathWithSlash().startsWith(this.getPathWithSlash());
 	}
 
 	@Override
 	public boolean equals(Object o) {
 		if (o instanceof RepoProject) {
 			RepoProject that = (RepoProject) o;
 			return this.getPathWithSlash().equals(that.getPathWithSlash());
 		}
 		return false;
 	}
 
 	@Override
 	public int hashCode() {
 		return this.getPathWithSlash().hashCode();
 	}
 
 	@Override
 	public int compareTo(RepoProject that) {
 		return this.getPathWithSlash().compareTo(that.getPathWithSlash());
 	}
 }