/*
    * Copyright (C) 2010, Stefan Lay <stefan.lay@sap.com>
    * Copyright (C) 2010-2012, Christian Halstrick <christian.halstrick@sap.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,
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   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  package org.eclipse.jgit.api;
  
  import java.text.MessageFormat;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.merge.MergeChunk;
  import org.eclipse.jgit.merge.MergeChunk.ConflictState;
  import org.eclipse.jgit.merge.MergeStrategy;
  import org.eclipse.jgit.merge.ResolveMerger.MergeFailureReason;
  
  /**
   * Encapsulates the result of a {@link org.eclipse.jgit.api.MergeCommand}.
   */
  public class MergeResult {
  
  	/**
  	 * The status the merge resulted in.
  	 */
  	public enum MergeStatus {
  		/** */
  		FAST_FORWARD {
  			@Override
  			public String toString() {
  				return "Fast-forward"; //$NON-NLS-1$
  			}
  
  			@Override
  			public boolean isSuccessful() {
  				return true;
  			}
  		},
  		/**
  		 * @since 2.0
  		 */
  		FAST_FORWARD_SQUASHED {
  			@Override
  			public String toString() {
  				return "Fast-forward-squashed"; //$NON-NLS-1$
  			}
  
  			@Override
  			public boolean isSuccessful() {
  				return true;
  			}
  		},
  		/** */
  		ALREADY_UP_TO_DATE {
  			@Override
  			public String toString() {
  				return "Already-up-to-date"; //$NON-NLS-1$
  			}
  
 			@Override
 			public boolean isSuccessful() {
 				return true;
 			}
 		},
 		/** */
 		FAILED {
 			@Override
 			public String toString() {
 				return "Failed"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return false;
 			}
 		},
 		/** */
 		MERGED {
 			@Override
 			public String toString() {
 				return "Merged"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return true;
 			}
 		},
 		/**
 		 * @since 2.0
 		 */
 		MERGED_SQUASHED {
 			@Override
 			public String toString() {
 				return "Merged-squashed"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return true;
 			}
 		},
 		/**
 		 * @since 3.0
 		 */
 		MERGED_SQUASHED_NOT_COMMITTED {
 			@Override
 			public String toString() {
 				return "Merged-squashed-not-committed"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return true;
 			}
 		},
 		/** */
 		CONFLICTING {
 			@Override
 			public String toString() {
 				return "Conflicting"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return false;
 			}
 		},
 		/**
 		 * @since 2.2
 		 */
 		ABORTED {
 			@Override
 			public String toString() {
 				return "Aborted"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return false;
 			}
 		},
 		/**
 		 * @since 3.0
 		 **/
 		MERGED_NOT_COMMITTED {
 			@Override
 			public String toString() {
 				return "Merged-not-committed"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return true;
 			}
 		},
 		/** */
 		NOT_SUPPORTED {
 			@Override
 			public String toString() {
 				return "Not-yet-supported"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return false;
 			}
 		},
 		/**
 		 * Status representing a checkout conflict, meaning that nothing could
 		 * be merged, as the pre-scan for the trees already failed for certain
 		 * files (i.e. local modifications prevent checkout of files).
 		 */
 		CHECKOUT_CONFLICT {
 			@Override
 			public String toString() {
 				return "Checkout Conflict"; //$NON-NLS-1$
 			}
 
 			@Override
 			public boolean isSuccessful() {
 				return false;
 			}
 		};
 
 		/**
 		 * @return whether the status indicates a successful result
 		 */
 		public abstract boolean isSuccessful();
 	}
 
 	private ObjectId[] mergedCommits;
 
 	private ObjectId base;
 
 	private ObjectId newHead;
 
 	private Map<String, int[][]> conflicts;
 
 	private MergeStatus mergeStatus;
 
 	private String description;
 
 	private MergeStrategy mergeStrategy;
 
 	private Map<String, MergeFailureReason> failingPaths;
 
 	private List<String> checkoutConflicts;
 
 	/**
 	 * Constructor for MergeResult.
 	 *
 	 * @param newHead
 	 *            the object the head points at after the merge
 	 * @param base
 	 *            the common base which was used to produce a content-merge. May
 	 *            be <code>null</code> if the merge-result was produced without
 	 *            computing a common base
 	 * @param mergedCommits
 	 *            all the commits which have been merged together
 	 * @param mergeStatus
 	 *            the status the merge resulted in
 	 * @param mergeStrategy
 	 *            the used {@link org.eclipse.jgit.merge.MergeStrategy}
 	 * @param lowLevelResults
 	 *            merge results as returned by
 	 *            {@link org.eclipse.jgit.merge.ResolveMerger#getMergeResults()}
 	 * @since 2.0
 	 */
 	public MergeResult(ObjectId newHead, ObjectId base,
 			ObjectId[] mergedCommits, MergeStatus mergeStatus,
 			MergeStrategy mergeStrategy,
 			Map<String, org.eclipse.jgit.merge.MergeResult<?>> lowLevelResults) {
 		this(newHead, base, mergedCommits, mergeStatus, mergeStrategy,
 				lowLevelResults, null);
 	}
 
 	/**
 	 * Constructor for MergeResult.
 	 *
 	 * @param newHead
 	 *            the object the head points at after the merge
 	 * @param base
 	 *            the common base which was used to produce a content-merge. May
 	 *            be <code>null</code> if the merge-result was produced without
 	 *            computing a common base
 	 * @param mergedCommits
 	 *            all the commits which have been merged together
 	 * @param mergeStatus
 	 *            the status the merge resulted in
 	 * @param mergeStrategy
 	 *            the used {@link org.eclipse.jgit.merge.MergeStrategy}
 	 * @param lowLevelResults
 	 *            merge results as returned by
 	 *            {@link org.eclipse.jgit.merge.ResolveMerger#getMergeResults()}
 	 * @param description
 	 *            a user friendly description of the merge result
 	 */
 	public MergeResult(ObjectId newHead, ObjectId base,
 			ObjectId[] mergedCommits, MergeStatus mergeStatus,
 			MergeStrategy mergeStrategy,
 			Map<String, org.eclipse.jgit.merge.MergeResult<?>> lowLevelResults,
 			String description) {
 		this(newHead, base, mergedCommits, mergeStatus, mergeStrategy,
 				lowLevelResults, null, description);
 	}
 
 	/**
 	 * Constructor for MergeResult.
 	 *
 	 * @param newHead
 	 *            the object the head points at after the merge
 	 * @param base
 	 *            the common base which was used to produce a content-merge. May
 	 *            be <code>null</code> if the merge-result was produced without
 	 *            computing a common base
 	 * @param mergedCommits
 	 *            all the commits which have been merged together
 	 * @param mergeStatus
 	 *            the status the merge resulted in
 	 * @param mergeStrategy
 	 *            the used {@link org.eclipse.jgit.merge.MergeStrategy}
 	 * @param lowLevelResults
 	 *            merge results as returned by
 	 *            {@link org.eclipse.jgit.merge.ResolveMerger#getMergeResults()}
 	 * @param failingPaths
 	 *            list of paths causing this merge to fail as returned by
 	 *            {@link org.eclipse.jgit.merge.ResolveMerger#getFailingPaths()}
 	 * @param description
 	 *            a user friendly description of the merge result
 	 */
 	public MergeResult(ObjectId newHead, ObjectId base,
 			ObjectId[] mergedCommits, MergeStatus mergeStatus,
 			MergeStrategy mergeStrategy,
 			Map<String, org.eclipse.jgit.merge.MergeResult<?>> lowLevelResults,
 			Map<String, MergeFailureReason> failingPaths, String description) {
 		this.newHead = newHead;
 		this.mergedCommits = mergedCommits;
 		this.base = base;
 		this.mergeStatus = mergeStatus;
 		this.mergeStrategy = mergeStrategy;
 		this.description = description;
 		this.failingPaths = failingPaths;
 		if (lowLevelResults != null)
 			for (Map.Entry<String, org.eclipse.jgit.merge.MergeResult<?>> result : lowLevelResults
 					.entrySet())
 				addConflict(result.getKey(), result.getValue());
 	}
 
 	/**
 	 * Creates a new result that represents a checkout conflict before the
 	 * operation even started for real.
 	 *
 	 * @param checkoutConflicts
 	 *            the conflicting files
 	 */
 	public MergeResult(List<String> checkoutConflicts) {
 		this.checkoutConflicts = checkoutConflicts;
 		this.mergeStatus = MergeStatus.CHECKOUT_CONFLICT;
 	}
 
 	/**
 	 * Get the object the head points at after the merge
 	 *
 	 * @return the object the head points at after the merge
 	 */
 	public ObjectId getNewHead() {
 		return newHead;
 	}
 
 	/**
 	 * Get the merge status
 	 *
 	 * @return the status the merge resulted in
 	 */
 	public MergeStatus getMergeStatus() {
 		return mergeStatus;
 	}
 
 	/**
 	 * Get the commits which have been merged
 	 *
 	 * @return all the commits which have been merged together
 	 */
 	public ObjectId[] getMergedCommits() {
 		return mergedCommits;
 	}
 
 	/**
 	 * Get the common base
 	 *
 	 * @return base the common base which was used to produce a content-merge.
 	 *         May be <code>null</code> if the merge-result was produced without
 	 *         computing a common base
 	 */
 	public ObjectId getBase() {
 		return base;
 	}
 
 	/** {@inheritDoc} */
 	@SuppressWarnings("nls")
 	@Override
 	public String toString() {
 		boolean first = true;
 		StringBuilder commits = new StringBuilder();
 		for (ObjectId commit : mergedCommits) {
 			if (!first)
 				commits.append(", ");
 			else
 				first = false;
 			commits.append(ObjectId.toString(commit));
 		}
 		return MessageFormat.format(
 				JGitText.get().mergeUsingStrategyResultedInDescription,
 				commits, ObjectId.toString(base), mergeStrategy.getName(),
 				mergeStatus, (description == null ? "" : ", " + description));
 	}
 
 	/**
 	 * Set conflicts
 	 *
 	 * @param conflicts
 	 *            the conflicts to set
 	 */
 	public void setConflicts(Map<String, int[][]> conflicts) {
 		this.conflicts = conflicts;
 	}
 
 	/**
 	 * Add a conflict
 	 *
 	 * @param path
 	 *            path of the file to add a conflict for
 	 * @param conflictingRanges
 	 *            the conflicts to set
 	 */
 	public void addConflict(String path, int[][] conflictingRanges) {
 		if (conflicts == null)
 			conflicts = new HashMap<>();
 		conflicts.put(path, conflictingRanges);
 	}
 
 	/**
 	 * Add a conflict
 	 *
 	 * @param path
 	 *            path of the file to add a conflict for
 	 * @param lowLevelResult
 	 *            a {@link org.eclipse.jgit.merge.MergeResult}
 	 */
 	public void addConflict(String path, org.eclipse.jgit.merge.MergeResult<?> lowLevelResult) {
 		if (!lowLevelResult.containsConflicts())
 			return;
 		if (conflicts == null)
 			conflicts = new HashMap<>();
 		int nrOfConflicts = 0;
 		// just counting
 		for (MergeChunk mergeChunk : lowLevelResult) {
 			if (mergeChunk.getConflictState().equals(ConflictState.FIRST_CONFLICTING_RANGE)) {
 				nrOfConflicts++;
 			}
 		}
 		int currentConflict = -1;
 		int[][] ret=new int[nrOfConflicts][mergedCommits.length+1];
 		for (MergeChunk mergeChunk : lowLevelResult) {
 			// to store the end of this chunk (end of the last conflicting range)
 			int endOfChunk = 0;
 			if (mergeChunk.getConflictState().equals(ConflictState.FIRST_CONFLICTING_RANGE)) {
 				if (currentConflict > -1) {
 					// there was a previous conflicting range for which the end
 					// is not set yet - set it!
 					ret[currentConflict][mergedCommits.length] = endOfChunk;
 				}
 				currentConflict++;
 				endOfChunk = mergeChunk.getEnd();
 				ret[currentConflict][mergeChunk.getSequenceIndex()] = mergeChunk.getBegin();
 			}
 			if (mergeChunk.getConflictState().equals(ConflictState.NEXT_CONFLICTING_RANGE)) {
 				if (mergeChunk.getEnd() > endOfChunk)
 					endOfChunk = mergeChunk.getEnd();
 				ret[currentConflict][mergeChunk.getSequenceIndex()] = mergeChunk.getBegin();
 			}
 		}
 		conflicts.put(path, ret);
 	}
 
 	/**
 	 * Returns information about the conflicts which occurred during a
 	 * {@link org.eclipse.jgit.api.MergeCommand}. The returned value maps the
 	 * path of a conflicting file to a two-dimensional int-array of line-numbers
 	 * telling where in the file conflict markers for which merged commit can be
 	 * found.
 	 * <p>
 	 * If the returned value contains a mapping "path"-&gt;[x][y]=z then this
 	 * means
 	 * <ul>
 	 * <li>the file with path "path" contains conflicts</li>
 	 * <li>if y &lt; "number of merged commits": for conflict number x in this
 	 * file the chunk which was copied from commit number y starts on line
 	 * number z. All numberings and line numbers start with 0.</li>
 	 * <li>if y == "number of merged commits": the first non-conflicting line
 	 * after conflict number x starts at line number z</li>
 	 * </ul>
 	 * <p>
 	 * Example code how to parse this data:
 	 *
 	 * <pre>
 	 * MergeResult m=...;
 	 * Map&lt;String, int[][]&gt; allConflicts = m.getConflicts();
 	 * for (String path : allConflicts.keySet()) {
 	 * 	int[][] c = allConflicts.get(path);
 	 * 	System.out.println("Conflicts in file " + path);
 	 * 	for (int i = 0; i &lt; c.length; ++i) {
 	 * 		System.out.println("  Conflict #" + i);
 	 * 		for (int j = 0; j &lt; (c[i].length) - 1; ++j) {
 	 * 			if (c[i][j] &gt;= 0)
 	 * 				System.out.println("    Chunk for "
 	 * 						+ m.getMergedCommits()[j] + " starts on line #"
 	 * 						+ c[i][j]);
 	 * 		}
 	 * 	}
 	 * }
 	 * </pre>
 	 *
 	 * @return the conflicts or <code>null</code> if no conflict occurred
 	 */
 	public Map<String, int[][]> getConflicts() {
 		return conflicts;
 	}
 
 	/**
 	 * Returns a list of paths causing this merge to fail as returned by
 	 * {@link org.eclipse.jgit.merge.ResolveMerger#getFailingPaths()}
 	 *
 	 * @return the list of paths causing this merge to fail or <code>null</code>
 	 *         if no failure occurred
 	 */
 	public Map<String, MergeFailureReason> getFailingPaths() {
 		return failingPaths;
 	}
 
 	/**
 	 * Returns a list of paths that cause a checkout conflict. These paths
 	 * prevent the operation from even starting.
 	 *
 	 * @return the list of files that caused the checkout conflict.
 	 */
 	public List<String> getCheckoutConflicts() {
 		return checkoutConflicts;
 	}
 }