/*
 * Copyright (C) 2010, Mathias Kinzler <mathias.kinzler@sap.com>
 * Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.com>
 * 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.api;

import java.io.IOException;
import java.text.MessageFormat;
import java.util.Arrays;

import org.eclipse.jgit.api.errors.DetachedHeadException;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.InvalidRefNameException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.api.errors.NoHeadException;
import org.eclipse.jgit.api.errors.RefAlreadyExistsException;
import org.eclipse.jgit.api.errors.RefNotFoundException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.ConfigConstants;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefRename;
import org.eclipse.jgit.lib.RefUpdate.Result;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.StoredConfig;

Used to rename branches.
See Also:
Git documentation about Branch/**
 * Used to rename branches.
 *
 * @see <a
 *      href="http://www.kernel.org/pub/software/scm/git/docs/git-branch.html"
 *      >Git documentation about Branch</a>
 */
public class RenameBranchCommand extends GitCommand<Ref> {
	private String oldName;

	private String newName;

	

Constructor for RenameBranchCommand.

Params:
repo –  the Repository/**
	 * <p>
	 * Constructor for RenameBranchCommand.
	 * </p>
	 *
	 * @param repo
	 *            the {@link org.eclipse.jgit.lib.Repository}
	 */
	protected RenameBranchCommand(Repository repo) {
		super(repo);
	}

	
{@inheritDoc} /** {@inheritDoc} */
	@Override
	public Ref call() throws GitAPIException, RefNotFoundException, InvalidRefNameException,
			RefAlreadyExistsException, DetachedHeadException {
		checkCallable();

		if (newName == null) {
			throw new InvalidRefNameException(MessageFormat.format(JGitText
					.get().branchNameInvalid, "<null>")); //$NON-NLS-1$
		}
		try {
			String fullOldName;
			String fullNewName;
			if (oldName != null) {
				// Don't just rely on findRef -- if there are local and remote
				// branches with the same name, and oldName is a short name, it
				// does not uniquely identify the ref and we might end up
				// renaming the wrong branch or finding a tag instead even
				// if a unique branch for the name exists!
				//
				// OldName may be a either a short or a full name.
				Ref ref = repo.exactRef(oldName);
				if (ref == null) {
					ref = repo.exactRef(Constants.R_HEADS + oldName);
					Ref ref2 = repo.exactRef(Constants.R_REMOTES + oldName);
					if (ref != null && ref2 != null) {
						throw new RefNotFoundException(MessageFormat.format(
								JGitText.get().renameBranchFailedAmbiguous,
								oldName, ref.getName(), ref2.getName()));
					} else if (ref == null) {
						if (ref2 != null) {
							ref = ref2;
						} else {
							throw new RefNotFoundException(MessageFormat.format(
									JGitText.get().refNotResolved, oldName));
						}
					}
				}
				fullOldName = ref.getName();
			} else {
				fullOldName = repo.getFullBranch();
				if (fullOldName == null) {
					throw new NoHeadException(
							JGitText.get().invalidRepositoryStateNoHead);
				}
				if (ObjectId.isId(fullOldName))
					throw new DetachedHeadException();
			}

			if (fullOldName.startsWith(Constants.R_REMOTES)) {
				fullNewName = Constants.R_REMOTES + newName;
			} else if (fullOldName.startsWith(Constants.R_HEADS)) {
				fullNewName = Constants.R_HEADS + newName;
			} else {
				throw new RefNotFoundException(MessageFormat.format(
						JGitText.get().renameBranchFailedNotABranch,
						fullOldName));
			}

			if (!Repository.isValidRefName(fullNewName)) {
				throw new InvalidRefNameException(MessageFormat.format(JGitText
						.get().branchNameInvalid, fullNewName));
			}
			if (repo.exactRef(fullNewName) != null) {
				throw new RefAlreadyExistsException(MessageFormat
						.format(JGitText.get().refAlreadyExists1, fullNewName));
			}
			RefRename rename = repo.renameRef(fullOldName, fullNewName);
			Result renameResult = rename.rename();

			setCallable(false);

			if (Result.RENAMED != renameResult) {
				throw new JGitInternalException(MessageFormat.format(JGitText
						.get().renameBranchUnexpectedResult, renameResult
						.name()));
			}
			if (fullNewName.startsWith(Constants.R_HEADS)) {
				String shortOldName = fullOldName.substring(Constants.R_HEADS
						.length());
				final StoredConfig repoConfig = repo.getConfig();
				// Copy all configuration values over to the new branch
				for (String name : repoConfig.getNames(
						ConfigConstants.CONFIG_BRANCH_SECTION, shortOldName)) {
					String[] values = repoConfig.getStringList(
							ConfigConstants.CONFIG_BRANCH_SECTION,
							shortOldName, name);
					if (values.length == 0) {
						continue;
					}
					// Keep any existing values already configured for the
					// new branch name
					String[] existing = repoConfig.getStringList(
							ConfigConstants.CONFIG_BRANCH_SECTION, newName,
							name);
					if (existing.length > 0) {
						String[] newValues = new String[values.length
								+ existing.length];
						System.arraycopy(existing, 0, newValues, 0,
								existing.length);
						System.arraycopy(values, 0, newValues, existing.length,
								values.length);
						values = newValues;
					}

					repoConfig.setStringList(
							ConfigConstants.CONFIG_BRANCH_SECTION, newName,
							name, Arrays.asList(values));
				}
				repoConfig.unsetSection(ConfigConstants.CONFIG_BRANCH_SECTION,
						shortOldName);
				repoConfig.save();
			}

			Ref resultRef = repo.exactRef(fullNewName);
			if (resultRef == null) {
				throw new JGitInternalException(
						JGitText.get().renameBranchFailedUnknownReason);
			}
			return resultRef;
		} catch (IOException ioe) {
			throw new JGitInternalException(ioe.getMessage(), ioe);
		}
	}

	
Sets the new short name of the branch.
 The full name is constructed using the prefix of the branch to be renamed defined by either setOldName(String) or HEAD. If that old branch is a local branch, the renamed branch also will be, and if the old branch is a remote branch, so will be the renamed branch. 
Params:
newName – 
           the new name
Returns:
this instance/**
	 * Sets the new short name of the branch.
	 * <p>
	 * The full name is constructed using the prefix of the branch to be renamed
	 * defined by either {@link #setOldName(String)} or HEAD. If that old branch
	 * is a local branch, the renamed branch also will be, and if the old branch
	 * is a remote branch, so will be the renamed branch.
	 * </p>
	 *
	 * @param newName
	 *            the new name
	 * @return this instance
	 */
	public RenameBranchCommand setNewName(String newName) {
		checkCallable();
		this.newName = newName;
		return this;
	}

	
Sets the old name of the branch.
 oldName may be a short or a full name. Using a full name is recommended to unambiguously identify the branch to be renamed. 
Params:
oldName – 
           the name of the branch to rename; if not set, the currently
           checked out branch (if any) will be renamed
Returns:
this instance/**
	 * Sets the old name of the branch.
	 * <p>
	 * {@code oldName} may be a short or a full name. Using a full name is
	 * recommended to unambiguously identify the branch to be renamed.
	 * </p>
	 *
	 * @param oldName
	 *            the name of the branch to rename; if not set, the currently
	 *            checked out branch (if any) will be renamed
	 * @return this instance
	 */
	public RenameBranchCommand setOldName(String oldName) {
		checkCallable();
		this.oldName = oldName;
		return this;
	}
}