/*
    * Copyright (C) 2010, 2012 Chris Aniszczyk <caniszczyk@gmail.com>
    * Copyright (C) 2013, Obeo
    * 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.pgm;
  
  import java.text.MessageFormat;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.jgit.api.CheckoutCommand;
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.api.errors.CheckoutConflictException;
  import org.eclipse.jgit.api.errors.RefAlreadyExistsException;
  import org.eclipse.jgit.api.errors.RefNotFoundException;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.pgm.internal.CLIText;
  import org.kohsuke.args4j.Argument;
  import org.kohsuke.args4j.Option;
  import org.kohsuke.args4j.spi.RestOfArgumentsHandler;
  
  @Command(common = true, usage = "usage_checkout")
  class Checkout extends TextBuiltin {
  
  	@Option(name = "-b", usage = "usage_createBranchAndCheckout")
  	private boolean createBranch = false;
  
  	@Option(name = "--force", aliases = { "-f" }, usage = "usage_forceCheckout")
  	private boolean force = false;
  
  	@Option(name = "--orphan", usage = "usage_orphan")
  	private boolean orphan = false;
  
  	@Argument(required = false, index = 0, metaVar = "metaVar_name", usage = "usage_checkout")
  	private String name;
  
  	@Option(name = "--", metaVar = "metaVar_paths", multiValued = true, handler = RestOfArgumentsHandler.class)
  	private List<String> paths = new ArrayList<String>();
  
  	@Override
  	protected void run() throws Exception {
  		if (createBranch) {
  			final ObjectId head = db.resolve(Constants.HEAD);
  			if (head == null)
  				throw die(CLIText.get().onBranchToBeBorn);
  		}
  
  		try (Git git = new Git(db)) {
  			CheckoutCommand command = git.checkout();
  			if (paths.size() > 0) {
  				command.setStartPoint(name);
  				if (paths.size() == 1 && paths.get(0).equals(".")) { //$NON-NLS-1$
  					command.setAllPaths(true);
  				} else {
  					command.addPaths(paths);
  				}
 			} else {
 				command.setCreateBranch(createBranch);
 				command.setName(name);
 				command.setForce(force);
 				command.setOrphan(orphan);
 			}
 			try {
 				String oldBranch = db.getBranch();
 				Ref ref = command.call();
 				if (ref == null)
 					return;
 				if (Repository.shortenRefName(ref.getName()).equals(oldBranch)) {
 					outw.println(MessageFormat.format(
 							CLIText.get().alreadyOnBranch,
 							name));
 					return;
 				}
 				if (createBranch || orphan)
 					outw.println(MessageFormat.format(
 							CLIText.get().switchedToNewBranch, name));
 				else
 					outw.println(MessageFormat.format(
 							CLIText.get().switchedToBranch,
 							Repository.shortenRefName(ref.getName())));
 			} catch (RefNotFoundException e) {
 				outw.println(MessageFormat.format(
 						CLIText.get().pathspecDidNotMatch,
 						name));
 			} catch (RefAlreadyExistsException e) {
 				throw die(MessageFormat.format(CLIText.get().branchAlreadyExists,
 						name));
 			} catch (CheckoutConflictException e) {
 				outw.println(CLIText.get().checkoutConflict);
 				for (String path : e.getConflictingPaths())
 					outw.println(MessageFormat.format(
 							CLIText.get().checkoutConflictPathLine, path));
 			}
 		}
 	}
 }