/*
    * 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,
   * 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 static java.nio.charset.StandardCharsets.UTF_8;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Collections;
  
  import org.eclipse.jgit.junit.RepositoryTestCase;
  import org.junit.Test;
  
  public class MergeHeadMsgTest extends RepositoryTestCase {
  	private static final String mergeMsg = "merge a and b";
  
  	private static final String sampleId = "1c6db447abdbb291b25f07be38ea0b1bf94947c5";
  
  	@Test
  	public void testReadWriteMergeHeads() throws IOException {
  		assertEquals(db.readMergeHeads(), null);
  		db.writeMergeHeads(Arrays.asList(ObjectId.zeroId(),
  				ObjectId.fromString(sampleId)));
  		assertEquals(read(new File(db.getDirectory(), "MERGE_HEAD")), "0000000000000000000000000000000000000000\n1c6db447abdbb291b25f07be38ea0b1bf94947c5\n");
  		assertEquals(db.readMergeHeads().size(), 2);
  		assertEquals(db.readMergeHeads().get(0), ObjectId.zeroId());
  		assertEquals(db.readMergeHeads().get(1), ObjectId.fromString(sampleId));
  
  		// same test again, this time with lower-level io
  		try (FileOutputStream fos = new FileOutputStream(
  				new File(db.getDirectory(), "MERGE_HEAD"));) {
  			fos.write(
  					"0000000000000000000000000000000000000000\n1c6db447abdbb291b25f07be38ea0b1bf94947c5\n"
  							.getBytes(UTF_8));
  		}
  		assertEquals(db.readMergeHeads().size(), 2);
  		assertEquals(db.readMergeHeads().get(0), ObjectId.zeroId());
  		assertEquals(db.readMergeHeads().get(1), ObjectId.fromString(sampleId));
  		db.writeMergeHeads(Collections.<ObjectId> emptyList());
  		assertEquals(read(new File(db.getDirectory(), "MERGE_HEAD")), "");
  		assertEquals(db.readMergeHeads(), null);
  		try (FileOutputStream fos = new FileOutputStream(
  				new File(db.getDirectory(), "MERGE_HEAD"))) {
  			fos.write(sampleId.getBytes(UTF_8));
  		}
  		assertEquals(db.readMergeHeads().size(), 1);
  		assertEquals(db.readMergeHeads().get(0), ObjectId.fromString(sampleId));
  	}
  
  	@Test
  	public void testReadWriteMergeMsg() throws IOException {
  		assertEquals(db.readMergeCommitMsg(), null);
  		assertFalse(new File(db.getDirectory(), "MERGE_MSG").exists());
  		db.writeMergeCommitMsg(mergeMsg);
  		assertEquals(db.readMergeCommitMsg(), mergeMsg);
 		assertEquals(read(new File(db.getDirectory(), "MERGE_MSG")), mergeMsg);
 		db.writeMergeCommitMsg(null);
 		assertEquals(db.readMergeCommitMsg(), null);
 		assertFalse(new File(db.getDirectory(), "MERGE_MSG").exists());
 		try (FileOutputStream fos = new FileOutputStream(
 				new File(db.getDirectory(), Constants.MERGE_MSG))) {
 			fos.write(mergeMsg.getBytes(UTF_8));
 		}
 		assertEquals(db.readMergeCommitMsg(), mergeMsg);
 	}
 
 }