/*
    * Copyright (C) 2008, Mike Ralphson <mike@abacus.co.uk>
    * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg.lists@dewire.com>
    * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
    * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
    * 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.lib;
  
  import org.eclipse.jgit.internal.JGitText;
  /**
   * Important state of the repository that affects what can and cannot bed
   * done. This is things like unhandled conflicted merges and unfinished rebase.
   *
   * The granularity and set of states are somewhat arbitrary. The methods
   * on the state are the only supported means of deciding what to do.
   */
  public enum RepositoryState {
  	/** Has no work tree and cannot be used for normal editing. */
  	BARE {
  		@Override
  		public boolean canCheckout() { return false; }
  
  		@Override
  		public boolean canResetHead() { return false; }
  
  		@Override
  		public boolean canCommit() { return false; }
  
  		@Override
  		public boolean canAmend() { return false; }
  
  		@Override
  		public boolean isRebasing() { return false; }
  
  		@Override
  		public String getDescription() {
  			return JGitText.get().repositoryState_bare;
  		}
  	},
  
  	/**
  	 * A safe state for working normally
  	 * */
  	SAFE {
  		@Override
  		public boolean canCheckout() { return true; }
  
  		@Override
  		public boolean canResetHead() { return true; }
  
  		@Override
  		public boolean canCommit() { return true; }
  
  		@Override
  		public boolean canAmend() { return true; }
  
  		@Override
  		public boolean isRebasing() { return false; }
  
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_normal; }
 	},
 
 	/** An unfinished merge. Must resolve or reset before continuing normally
 	 */
 	MERGING {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return true; }
 
 		@Override
 		public boolean canCommit() { return false; }
 
 		@Override
 		public boolean canAmend() { return false; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_conflicts; }
 	},
 
 	/**
 	 * An merge where all conflicts have been resolved. The index does not
 	 * contain any unmerged paths.
 	 */
 	MERGING_RESOLVED {
 		@Override
 		public boolean canCheckout() { return true; }
 
 		@Override
 		public boolean canResetHead() { return true; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return false; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_merged; }
 	},
 
 	/** An unfinished cherry-pick. Must resolve or reset before continuing normally
 	 */
 	CHERRY_PICKING {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return true; }
 
 		@Override
 		public boolean canCommit() { return false; }
 
 		@Override
 		public boolean canAmend() { return false; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_conflicts; }
 	},
 
 	/**
 	 * A cherry-pick where all conflicts have been resolved. The index does not
 	 * contain any unmerged paths.
 	 */
 	CHERRY_PICKING_RESOLVED {
 		@Override
 		public boolean canCheckout() { return true; }
 
 		@Override
 		public boolean canResetHead() { return true; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return false; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_merged; }
 	},
 
 	/** An unfinished revert. Must resolve or reset before continuing normally
 	 */
 	REVERTING {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return true; }
 
 		@Override
 		public boolean canCommit() { return false; }
 
 		@Override
 		public boolean canAmend() { return false; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_conflicts; }
 	},
 
 	/**
 	 * A revert where all conflicts have been resolved. The index does not
 	 * contain any unmerged paths.
 	 */
 	REVERTING_RESOLVED {
 		@Override
 		public boolean canCheckout() { return true; }
 
 		@Override
 		public boolean canResetHead() { return true; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return false; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_merged; }
 	},
 
 	/**
 	 * An unfinished rebase or am. Must resolve, skip or abort before normal work can take place
 	 */
 	REBASING {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return false; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return true; }
 
 		@Override
 		public boolean isRebasing() { return true; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_rebaseOrApplyMailbox; }
 	},
 
 	/**
 	 * An unfinished rebase. Must resolve, skip or abort before normal work can take place
 	 */
 	REBASING_REBASING {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return false; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return true; }
 
 		@Override
 		public boolean isRebasing() { return true; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_rebase; }
 	},
 
 	/**
 	 * An unfinished apply. Must resolve, skip or abort before normal work can take place
 	 */
 	APPLY {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return false; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return true; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_applyMailbox; }
 	},
 
 	/**
 	 * An unfinished rebase with merge. Must resolve, skip or abort before normal work can take place
 	 */
 	REBASING_MERGE {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return false; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return true; }
 
 		@Override
 		public boolean isRebasing() { return true; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_rebaseWithMerge; }
 	},
 
 	/**
 	 * An unfinished interactive rebase. Must resolve, skip or abort before normal work can take place
 	 */
 	REBASING_INTERACTIVE {
 		@Override
 		public boolean canCheckout() { return false; }
 
 		@Override
 		public boolean canResetHead() { return false; }
 
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return true; }
 
 		@Override
 		public boolean isRebasing() { return true; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_rebaseInteractive; }
 	},
 
 	/**
 	 * Bisecting being done. Normal work may continue but is discouraged
 	 */
 	BISECTING {
 		/* Changing head is a normal operation when bisecting */
 		@Override
 		public boolean canCheckout() { return true; }
 
 		/* Do not reset, checkout instead */
 		@Override
 		public boolean canResetHead() { return false; }
 
 		/* Commit during bisect is useful */
 		@Override
 		public boolean canCommit() { return true; }
 
 		@Override
 		public boolean canAmend() { return false; }
 
 		@Override
 		public boolean isRebasing() { return false; }
 
 		@Override
 		public String getDescription() { return JGitText.get().repositoryState_bisecting; }
 	};
 
 	/**
 	 * @return true if changing HEAD is sane.
 	 */
 	public abstract boolean canCheckout();
 
 	/**
 	 * @return true if we can commit
 	 */
 	public abstract boolean canCommit();
 
 	/**
 	 * @return true if reset to another HEAD is considered SAFE
 	 */
 	public abstract boolean canResetHead();
 
 	/**
 	 * @return true if amending is considered SAFE
 	 */
 	public abstract boolean canAmend();
 
 	/**
 	 * @return true if the repository is currently in a rebase
 	 * @since 3.0
 	 */
 	public abstract boolean isRebasing();
 
 	/**
 	 * @return a human readable description of the state.
 	 */
 	public abstract String getDescription();
 }