/*
 * Copyright (C) 2010, Mathias Kinzler <mathias.kinzler@sap.com>
 * Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.com> and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
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;
	}
}