/*
    * Copyright (C) 2011, GitHub 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,
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   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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  package org.eclipse.jgit.api;
  
  import java.io.File;
  import java.io.IOException;
  import java.text.MessageFormat;
  
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.api.errors.JGitInternalException;
  import org.eclipse.jgit.api.errors.NoFilepatternException;
  import org.eclipse.jgit.errors.ConfigInvalidException;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.ConfigConstants;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.NullProgressMonitor;
  import org.eclipse.jgit.lib.ProgressMonitor;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.lib.StoredConfig;
  import org.eclipse.jgit.storage.file.FileBasedConfig;
  import org.eclipse.jgit.submodule.SubmoduleWalk;
  import org.eclipse.jgit.treewalk.filter.PathFilter;
  import org.eclipse.jgit.treewalk.filter.TreeFilter;
  
  /**
   * A class used to execute a submodule add command.
   *
   * This will clone the configured submodule, register the submodule in the
   * .gitmodules file and the repository config file, and also add the submodule
   * and .gitmodules file to the index.
   *
   * @see <a
   *      href="http://www.kernel.org/pub/software/scm/git/docs/git-submodule.html"
   *      >Git documentation about submodules</a>
   */
  public class SubmoduleAddCommand extends
  		TransportCommand<SubmoduleAddCommand, Repository> {
  
  	private String path;
  
  	private String uri;
  
  	private ProgressMonitor monitor;
  
  	/**
  	 * @param repo
  	 */
  	public SubmoduleAddCommand(final Repository repo) {
  		super(repo);
  	}
  
  	/**
  	 * Set repository-relative path of submodule
  	 *
  	 * @param path
  	 *            (with <code>/</code> as separator)
  	 * @return this command
  	 */
  	public SubmoduleAddCommand setPath(final String path) {
 		this.path = path;
 		return this;
 	}
 
 	/**
 	 * Set URI to clone submodule from
 	 *
 	 * @param uri
 	 * @return this command
 	 */
 	public SubmoduleAddCommand setURI(final String uri) {
 		this.uri = uri;
 		return this;
 	}
 
 	/**
 	 * The progress monitor associated with the clone operation. By default,
 	 * this is set to <code>NullProgressMonitor</code>
 	 *
 	 * @see NullProgressMonitor
 	 * @param monitor
 	 * @return this command
 	 */
 	public SubmoduleAddCommand setProgressMonitor(final ProgressMonitor monitor) {
 		this.monitor = monitor;
 		return this;
 	}
 
 	/**
 	 * Is the configured already a submodule in the index?
 	 *
 	 * @return true if submodule exists in index, false otherwise
 	 * @throws IOException
 	 */
 	protected boolean submoduleExists() throws IOException {
 		TreeFilter filter = PathFilter.create(path);
 		return SubmoduleWalk.forIndex(repo).setFilter(filter).next();
 	}
 
 	/**
 	 * Executes the {@code SubmoduleAddCommand}
 	 *
 	 * The {@code Repository} instance returned by this command needs to be
 	 * closed by the caller to free resources held by the {@code Repository}
 	 * instance. It is recommended to call this method as soon as you don't need
 	 * a reference to this {@code Repository} instance anymore.
 	 *
 	 * @return the newly created {@link Repository}
 	 * @throws GitAPIException
 	 */
 	public Repository call() throws GitAPIException {
 		checkCallable();
 		if (path == null || path.length() == 0)
 			throw new IllegalArgumentException(JGitText.get().pathNotConfigured);
 		if (uri == null || uri.length() == 0)
 			throw new IllegalArgumentException(JGitText.get().uriNotConfigured);
 
 		try {
 			if (submoduleExists())
 				throw new JGitInternalException(MessageFormat.format(
 						JGitText.get().submoduleExists, path));
 		} catch (IOException e) {
 			throw new JGitInternalException(e.getMessage(), e);
 		}
 
 		final String resolvedUri;
 		try {
 			resolvedUri = SubmoduleWalk.getSubmoduleRemoteUrl(repo, uri);
 		} catch (IOException e) {
 			throw new JGitInternalException(e.getMessage(), e);
 		}
 		// Clone submodule repository
 		File moduleDirectory = SubmoduleWalk.getSubmoduleDirectory(repo, path);
 		CloneCommand clone = Git.cloneRepository();
 		configure(clone);
 		clone.setDirectory(moduleDirectory);
 		clone.setURI(resolvedUri);
 		if (monitor != null)
 			clone.setProgressMonitor(monitor);
 		Repository subRepo = clone.call().getRepository();
 
 		// Save submodule URL to parent repository's config
 		StoredConfig config = repo.getConfig();
 		config.setString(ConfigConstants.CONFIG_SUBMODULE_SECTION, path,
 				ConfigConstants.CONFIG_KEY_URL, resolvedUri);
 		try {
 			config.save();
 		} catch (IOException e) {
 			throw new JGitInternalException(e.getMessage(), e);
 		}
 
 		// Save path and URL to parent repository's .gitmodules file
 		FileBasedConfig modulesConfig = new FileBasedConfig(new File(
 				repo.getWorkTree(), Constants.DOT_GIT_MODULES), repo.getFS());
 		try {
 			modulesConfig.load();
 			modulesConfig.setString(ConfigConstants.CONFIG_SUBMODULE_SECTION,
 					path, ConfigConstants.CONFIG_KEY_PATH, path);
 			modulesConfig.setString(ConfigConstants.CONFIG_SUBMODULE_SECTION,
 					path, ConfigConstants.CONFIG_KEY_URL, uri);
 			modulesConfig.save();
 		} catch (IOException e) {
 			throw new JGitInternalException(e.getMessage(), e);
 		} catch (ConfigInvalidException e) {
 			throw new JGitInternalException(e.getMessage(), e);
 		}
 
 		AddCommand add = new AddCommand(repo);
 		// Add .gitmodules file to parent repository's index
 		add.addFilepattern(Constants.DOT_GIT_MODULES);
 		// Add submodule directory to parent repository's index
 		add.addFilepattern(path);
 		try {
 			add.call();
 		} catch (NoFilepatternException e) {
 			throw new JGitInternalException(e.getMessage(), e);
 		}
 
 		return subRepo;
 	}
 }