/*
 * Copyright (C) 2008, Google Inc. 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.lib;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

public class AbbreviatedObjectIdTest {
	@Test
	public void testEmpty_FromByteArray() {
		final AbbreviatedObjectId i;
		i = AbbreviatedObjectId.fromString(new byte[] {}, 0, 0);
		assertNotNull(i);
		assertEquals(0, i.length());
		assertFalse(i.isComplete());
		assertEquals("", i.name());
	}

	@Test
	public void testEmpty_FromString() {
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString("");
		assertNotNull(i);
		assertEquals(0, i.length());
		assertFalse(i.isComplete());
		assertEquals("", i.name());
	}

	@Test
	public void testFull_FromByteArray() {
		final String s = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final byte[] b = Constants.encodeASCII(s);
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(b, 0,
				b.length);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertTrue(i.isComplete());
		assertEquals(s, i.name());

		final ObjectId f = i.toObjectId();
		assertNotNull(f);
		assertEquals(ObjectId.fromString(s), f);
	}

	@Test
	public void testFull_FromString() {
		final String s = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertTrue(i.isComplete());
		assertEquals(s, i.name());

		final ObjectId f = i.toObjectId();
		assertNotNull(f);
		assertEquals(ObjectId.fromString(s), f);
	}

	@Test
	public void test1_FromString() {
		final String s = "7";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test2_FromString() {
		final String s = "7b";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test3_FromString() {
		final String s = "7b6";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test4_FromString() {
		final String s = "7b6e";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test5_FromString() {
		final String s = "7b6e8";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test6_FromString() {
		final String s = "7b6e80";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test7_FromString() {
		final String s = "7b6e806";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test8_FromString() {
		final String s = "7b6e8067";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test9_FromString() {
		final String s = "7b6e8067e";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void test17_FromString() {
		final String s = "7b6e8067ec96acef9";
		final AbbreviatedObjectId i = AbbreviatedObjectId.fromString(s);
		assertNotNull(i);
		assertEquals(s.length(), i.length());
		assertFalse(i.isComplete());
		assertEquals(s, i.name());
		assertNull(i.toObjectId());
	}

	@Test
	public void testEquals_Short8() {
		final String s = "7b6e8067";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(s);
		final AbbreviatedObjectId b = AbbreviatedObjectId.fromString(s);
		assertNotSame(a, b);
		assertTrue(a.hashCode() == b.hashCode());
		assertEquals(b, a);
		assertEquals(a, b);
	}

	@Test
	public void testEquals_Short4() {
		final String s = "7b6e";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(s);
		final AbbreviatedObjectId b = AbbreviatedObjectId.fromString(s);
		assertNotSame(a, b);
		assertTrue(a.hashCode() != 0);
		assertTrue(a.hashCode() == b.hashCode());
		assertEquals(b, a);
		assertEquals(a, b);
	}

	@Test
	public void testEquals_Full() {
		final String s = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(s);
		final AbbreviatedObjectId b = AbbreviatedObjectId.fromString(s);
		assertNotSame(a, b);
		assertTrue(a.hashCode() == b.hashCode());
		assertEquals(b, a);
		assertEquals(a, b);
	}

	@Test
	public void testNotEquals_SameLength() {
		final String sa = "7b6e8067";
		final String sb = "7b6e806e";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(sa);
		final AbbreviatedObjectId b = AbbreviatedObjectId.fromString(sb);
		assertFalse(a.equals(b));
		assertFalse(b.equals(a));
	}

	@Test
	public void testNotEquals_DiffLength() {
		final String sa = "7b6e8067abcd";
		final String sb = "7b6e8067";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(sa);
		final AbbreviatedObjectId b = AbbreviatedObjectId.fromString(sb);
		assertFalse(a.equals(b));
		assertFalse(b.equals(a));
	}

	@Test
	public void testPrefixCompare_Full() {
		final String s1 = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(s1);
		final ObjectId i1 = ObjectId.fromString(s1);
		assertEquals(0, a.prefixCompare(i1));
		assertTrue(i1.startsWith(a));

		final String s2 = "7b6e8067ec96acef9a4184b43210d583b6d2f99b";
		final ObjectId i2 = ObjectId.fromString(s2);
		assertTrue(a.prefixCompare(i2) < 0);
		assertFalse(i2.startsWith(a));

		final String s3 = "7b6e8067ec96acef9a4184b43210d583b6d2f999";
		final ObjectId i3 = ObjectId.fromString(s3);
		assertTrue(a.prefixCompare(i3) > 0);
		assertFalse(i3.startsWith(a));
	}

	@Test
	public void testPrefixCompare_1() {
		final String sa = "7";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(sa);

		final String s1 = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final ObjectId i1 = ObjectId.fromString(s1);
		assertEquals(0, a.prefixCompare(i1));
		assertTrue(i1.startsWith(a));

		final String s2 = "8b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final ObjectId i2 = ObjectId.fromString(s2);
		assertTrue(a.prefixCompare(i2) < 0);
		assertFalse(i2.startsWith(a));

		final String s3 = "6b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final ObjectId i3 = ObjectId.fromString(s3);
		assertTrue(a.prefixCompare(i3) > 0);
		assertFalse(i3.startsWith(a));
	}

	@Test
	public void testPrefixCompare_7() {
		final String sa = "7b6e806";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(sa);

		final String s1 = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final ObjectId i1 = ObjectId.fromString(s1);
		assertEquals(0, a.prefixCompare(i1));
		assertTrue(i1.startsWith(a));

		final String s2 = "7b6e8167ec86acef9a4184b43210d583b6d2f99a";
		final ObjectId i2 = ObjectId.fromString(s2);
		assertTrue(a.prefixCompare(i2) < 0);
		assertFalse(i2.startsWith(a));

		final String s3 = "7b6e8057eca6acef9a4184b43210d583b6d2f99a";
		final ObjectId i3 = ObjectId.fromString(s3);
		assertTrue(a.prefixCompare(i3) > 0);
		assertFalse(i3.startsWith(a));
	}

	@Test
	public void testPrefixCompare_8() {
		final String sa = "7b6e8067";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(sa);

		final String s1 = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final ObjectId i1 = ObjectId.fromString(s1);
		assertEquals(0, a.prefixCompare(i1));
		assertTrue(i1.startsWith(a));

		final String s2 = "7b6e8167ec86acef9a4184b43210d583b6d2f99a";
		final ObjectId i2 = ObjectId.fromString(s2);
		assertTrue(a.prefixCompare(i2) < 0);
		assertFalse(i2.startsWith(a));

		final String s3 = "7b6e8057eca6acef9a4184b43210d583b6d2f99a";
		final ObjectId i3 = ObjectId.fromString(s3);
		assertTrue(a.prefixCompare(i3) > 0);
		assertFalse(i3.startsWith(a));
	}

	@Test
	public void testPrefixCompare_9() {
		final String sa = "7b6e8067e";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(sa);

		final String s1 = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final ObjectId i1 = ObjectId.fromString(s1);
		assertEquals(0, a.prefixCompare(i1));
		assertTrue(i1.startsWith(a));

		final String s2 = "7b6e8167ec86acef9a4184b43210d583b6d2f99a";
		final ObjectId i2 = ObjectId.fromString(s2);
		assertTrue(a.prefixCompare(i2) < 0);
		assertFalse(i2.startsWith(a));

		final String s3 = "7b6e8057eca6acef9a4184b43210d583b6d2f99a";
		final ObjectId i3 = ObjectId.fromString(s3);
		assertTrue(a.prefixCompare(i3) > 0);
		assertFalse(i3.startsWith(a));
	}

	@Test
	public void testPrefixCompare_17() {
		final String sa = "7b6e8067ec96acef9";
		final AbbreviatedObjectId a = AbbreviatedObjectId.fromString(sa);

		final String s1 = "7b6e8067ec96acef9a4184b43210d583b6d2f99a";
		final ObjectId i1 = ObjectId.fromString(s1);
		assertEquals(0, a.prefixCompare(i1));
		assertTrue(i1.startsWith(a));

		final String s2 = "7b6e8067eca6acef9a4184b43210d583b6d2f99a";
		final ObjectId i2 = ObjectId.fromString(s2);
		assertTrue(a.prefixCompare(i2) < 0);
		assertFalse(i2.startsWith(a));

		final String s3 = "7b6e8067ec86acef9a4184b43210d583b6d2f99a";
		final ObjectId i3 = ObjectId.fromString(s3);
		assertTrue(a.prefixCompare(i3) > 0);
		assertFalse(i3.startsWith(a));
	}

	@Test
	public void testIsId() {
		// These are all too short.
		assertFalse(AbbreviatedObjectId.isId(""));
		assertFalse(AbbreviatedObjectId.isId("a"));

		// These are too long.
		assertFalse(AbbreviatedObjectId.isId(ObjectId.fromString(
				"7b6e8067ec86acef9a4184b43210d583b6d2f99a").name()
				+ "0"));
		assertFalse(AbbreviatedObjectId.isId(ObjectId.fromString(
				"7b6e8067ec86acef9a4184b43210d583b6d2f99a").name()
				+ "c0ffee"));

		// These contain non-hex characters.
		assertFalse(AbbreviatedObjectId.isId("01notahexstring"));

		// These should all work.
		assertTrue(AbbreviatedObjectId.isId("ab"));
		assertTrue(AbbreviatedObjectId.isId("abc"));
		assertTrue(AbbreviatedObjectId.isId("abcd"));
		assertTrue(AbbreviatedObjectId.isId("abcd0"));
		assertTrue(AbbreviatedObjectId.isId("abcd09"));
		assertTrue(AbbreviatedObjectId.isId(ObjectId.fromString(
				"7b6e8067ec86acef9a4184b43210d583b6d2f99a").name()));
	}
}