/*
    * Copyright (C) 2009, Google Inc.
    * Copyright (C) 2009, Johannes E. Schindelin <johannes.schindelin@gmx.de>
    * 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.diff;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.fail;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.eclipse.jgit.junit.JGitTestUtil;
  import org.eclipse.jgit.patch.FileHeader;
  import org.eclipse.jgit.patch.Patch;
  import org.eclipse.jgit.util.RawParseUtils;
  import org.junit.Before;
  import org.junit.Test;
  
  public class DiffFormatterReflowTest {
  	private RawText a;
  
  	private RawText b;
  
  	private FileHeader file;
  
  	private ByteArrayOutputStream out;
  
  	private DiffFormatter fmt;
  
  	@Before
  	public void setUp() throws Exception {
  		out = new ByteArrayOutputStream();
  		fmt = new DiffFormatter(out);
  	}
  
  	@Test
  	public void testNegativeContextFails() throws IOException {
  		init("X");
  		try {
  			fmt.setContext(-1);
  			fail("accepted negative context");
  		} catch (IllegalArgumentException e) {
  			// pass
  		}
  	}
  
  	@Test
  	public void testContext0() throws IOException {
  		init("X");
  		fmt.setContext(0);
  		assertFormatted();
  	}
  
  	@Test
  	public void testContext1() throws IOException {
  		init("X");
  		fmt.setContext(1);
 		assertFormatted();
 	}
 
 	@Test
 	public void testContext3() throws IOException {
 		init("X");
 		fmt.setContext(3);
 		assertFormatted();
 	}
 
 	@Test
 	public void testContext5() throws IOException {
 		init("X");
 		fmt.setContext(5);
 		assertFormatted();
 	}
 
 	@Test
 	public void testContext10() throws IOException {
 		init("X");
 		fmt.setContext(10);
 		assertFormatted();
 	}
 
 	@Test
 	public void testContext100() throws IOException {
 		init("X");
 		fmt.setContext(100);
 		assertFormatted();
 	}
 
 	@Test
 	public void testEmpty1() throws IOException {
 		init("E");
 		assertFormatted("E.patch");
 	}
 
 	@Test
 	public void testNoNewLine1() throws IOException {
 		init("Y");
 		assertFormatted("Y.patch");
 	}
 
 	@Test
 	public void testNoNewLine2() throws IOException {
 		init("Z");
 		assertFormatted("Z.patch");
 	}
 
 	private void init(String name) throws IOException {
 		a = new RawText(readFile(name + "_PreImage"));
 		b = new RawText(readFile(name + "_PostImage"));
 		file = parseTestPatchFile(name + ".patch").getFiles().get(0);
 	}
 
 	private void assertFormatted() throws IOException {
 		assertFormatted(JGitTestUtil.getName() + ".out");
 	}
 
 	private void assertFormatted(String name) throws IOException {
 		fmt.format(file, a, b);
 		final String exp = RawParseUtils.decode(readFile(name));
 		assertEquals(exp, RawParseUtils.decode(out.toByteArray()));
 	}
 
 	private byte[] readFile(String patchFile) throws IOException {
 		final InputStream in = getClass().getResourceAsStream(patchFile);
 		if (in == null) {
 			fail("No " + patchFile + " test vector");
 			return null; // Never happens
 		}
 		try {
 			final byte[] buf = new byte[1024];
 			final ByteArrayOutputStream temp = new ByteArrayOutputStream();
 			int n;
 			while ((n = in.read(buf)) > 0)
 				temp.write(buf, 0, n);
 			return temp.toByteArray();
 		} finally {
 			in.close();
 		}
 	}
 
 	private Patch parseTestPatchFile(String patchFile) throws IOException {
 		try (InputStream in = getClass().getResourceAsStream(patchFile)) {
 			if (in == null) {
 				fail("No " + patchFile + " test vector");
 				return null; // Never happens
 			}
 			final Patch p = new Patch();
 			p.parse(in);
 			return p;
 		}
 	}
 }