/*
    * Copyright (C) 2009-2010, Google Inc.
    * Copyright (C) 2009, Johannes E. Schindelin <johannes.schindelin@gmx.de> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
   */
  
  package org.eclipse.jgit.diff;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotEquals;
  import static org.junit.Assert.assertTrue;
  
  import org.eclipse.jgit.lib.Constants;
  import org.junit.Test;
  
  public class RawTextIgnoreWhitespaceChangeTest {
  	private final RawTextComparator cmp = RawTextComparator.WS_IGNORE_CHANGE;
  
  	@Test
  	public void testEqualsWithoutWhitespace() {
  		final RawText a = new RawText(Constants
  				.encodeASCII("foo-a\nfoo-b\nfoo\n"));
  		final RawText b = new RawText(Constants
  				.encodeASCII("foo-b\nfoo-c\nf\n"));
  
  		assertEquals(3, a.size());
  		assertEquals(3, b.size());
  
  		// foo-a != foo-b
  		assertFalse(cmp.equals(a, 0, b, 0));
  		assertFalse(cmp.equals(b, 0, a, 0));
  
  		// foo-b == foo-b
  		assertTrue(cmp.equals(a, 1, b, 0));
  		assertTrue(cmp.equals(b, 0, a, 1));
  
  		// foo != f
  		assertFalse(cmp.equals(a, 2, b, 2));
  		assertFalse(cmp.equals(b, 2, a, 2));
  	}
  
  	@Test
  	public void testEqualsWithWhitespace() {
  		final RawText a = new RawText(Constants
  				.encodeASCII("foo-a\n         \n a b c\na      \n  foo\na  b  c\n"));
  		final RawText b = new RawText(Constants
  				.encodeASCII("foo-a        b\n\nab  c\na\nfoo\na b     c  \n"));
  
  		// "foo-a" != "foo-a        b"
  		assertFalse(cmp.equals(a, 0, b, 0));
  		assertFalse(cmp.equals(b, 0, a, 0));
  
  		// "         " == ""
  		assertTrue(cmp.equals(a, 1, b, 1));
  		assertTrue(cmp.equals(b, 1, a, 1));
  
  		// " a b c" != "ab  c"
  		assertFalse(cmp.equals(a, 2, b, 2));
  		assertFalse(cmp.equals(b, 2, a, 2));
  
  		// "a      " == "a"
  		assertTrue(cmp.equals(a, 3, b, 3));
  		assertTrue(cmp.equals(b, 3, a, 3));
  
  		// "  foo" != "foo"
  		assertFalse(cmp.equals(a, 4, b, 4));
  		assertFalse(cmp.equals(b, 4, a, 4));
  
  		// "a  b  c" == "a b     c  "
  		assertTrue(cmp.equals(a, 5, b, 5));
  		assertTrue(cmp.equals(b, 5, a, 5));
  	}
  
  	@Test
  	public void testEqualsWithTabs() {
  		RawText a = new RawText(
  				Constants.encodeASCII("a\tb\t \na\tb\t c \n  foo\na b\na  b"));
  		RawText b = new RawText(
  				Constants.encodeASCII("a b \na b c\n\tfoo\nab\na \tb"));
  
  		// "a\tb\t \n" == "a b \n"
  		assertTrue(cmp.equals(a, 0, b, 0));
  		assertTrue(cmp.equals(b, 0, a, 0));
  
  		// "a\tb\t c \n" == "a b c\n"
  		assertTrue(cmp.equals(a, 1, b, 1));
  		assertTrue(cmp.equals(b, 1, a, 1));
  
  		// " foo" == "\tfoo"
  		assertTrue(cmp.equals(a, 2, b, 2));
  		assertTrue(cmp.equals(b, 2, a, 2));
  
  		// "a b" != "ab"
 		assertFalse(cmp.equals(a, 3, b, 3));
 		assertFalse(cmp.equals(b, 3, a, 3));
 
 		// "a b" == "a \tb "
 		assertTrue(cmp.equals(a, 4, b, 4));
 		assertTrue(cmp.equals(b, 4, a, 4));
 	}
 
 	@Test
 	public void testHashCode() {
 		RawText a = new RawText(Constants
 				.encodeASCII("a b  c\n\nab  c d  \n\ta bc d\nxyz\na  b  c"));
 		RawText b = new RawText(Constants.encodeASCII(
 				"a b  c\na   b c\nab  c d\na bc d\n  \t a bc d\na b c\n"));
 
 		// Same line gives equal hash
 		assertEquals(cmp.hash(a, 0), cmp.hash(a, 0));
 
 		// Empty lines produce the same hash
 		assertEquals(cmp.hash(a, 1), cmp.hash(a, 1));
 
 		// Equal lines from different RawTexts get the same hash (RawText
 		// instance is not part of the hash)
 		assertEquals(cmp.hash(a, 0), cmp.hash(b, 0));
 
 		// A blank produces the same hash as a TAB
 		assertEquals(cmp.hash(new RawText(Constants.encodeASCII(" ")), 0),
 				cmp.hash(new RawText(Constants.encodeASCII("\t")), 0));
 
 		// Lines with only differing whitespace produce same hash
 		assertEquals(cmp.hash(a, 0), cmp.hash(b, 1));
 
 		// Lines with different trailing whitespace produce the same hash
 		assertEquals(cmp.hash(a, 2), cmp.hash(b, 2));
 
 		// A line with leading whitespace produces a hash different from the
 		// same line without leading whitespace
 		assertNotEquals(cmp.hash(a, 3), cmp.hash(b, 3));
 
 		// Lines with different leading whitespace produce equal hashes
 		assertEquals(cmp.hash(a, 3), cmp.hash(b, 4));
 
 		// While different lines _should_ produce different hashes, that may not
 		// always be the case. But for these two lines, it is.
 		assertNotEquals(cmp.hash(a, 4), cmp.hash(b, 4));
 
 		// A line without trailing \n produces the same hash as one without
 		assertEquals(cmp.hash(a, 5), cmp.hash(b, 5));
 
 	}
 }