/*
 * Copyright (C) 2019, Thomas Wolf <thomas.wolf@paranor.ch>
 * 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.treewalk;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.time.Instant;

import org.junit.Test;

public class InstantComparatorTest {

	private final InstantComparator cmp = new InstantComparator();

	@Test
	public void compareNow() {
		Instant now = Instant.now();
		assertEquals(0, cmp.compare(now, now));
		assertEquals(0, cmp.compare(now, now, true));
	}

	@Test
	public void compareSeconds() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond());
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
		assertEquals(0, cmp.compare(t, s));
		assertEquals(0, cmp.compare(t, t));
		assertEquals(0, cmp.compare(s, t));
	}

	@Test
	public void compareSecondsOnly() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 987654321);
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
		assertEquals(0, cmp.compare(t, s, true));
		assertEquals(0, cmp.compare(t, t, true));
		assertEquals(0, cmp.compare(s, t, true));
	}

	@Test
	public void compareSecondsUnequal() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond());
		Instant s = Instant.ofEpochSecond(now.getEpochSecond() - 1L);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
	}

	@Test
	public void compareMillisEqual() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123000000);
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
		assertEquals(0, cmp.compare(s, t));
		assertEquals(0, cmp.compare(t, t));
		assertEquals(0, cmp.compare(t, s));
		s = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
		assertEquals(0, cmp.compare(s, t));
		assertEquals(0, cmp.compare(t, s));
		s = Instant.ofEpochSecond(now.getEpochSecond(), 123400000);
		assertEquals(0, cmp.compare(s, t));
		assertEquals(0, cmp.compare(t, s));
	}

	@Test
	public void compareMillisUnequal() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123000000);
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 122000000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		t = Instant.ofEpochSecond(now.getEpochSecond(), 130000000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		t = Instant.ofEpochSecond(now.getEpochSecond(), 200000000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123000000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
	}

	@Test
	public void compareMicrosEqual() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
		assertEquals(0, cmp.compare(s, t));
		assertEquals(0, cmp.compare(t, s));
		s = Instant.ofEpochSecond(now.getEpochSecond(), 123456700);
		assertEquals(0, cmp.compare(s, t));
		assertEquals(0, cmp.compare(t, s));
	}

	@Test
	public void compareMicrosUnequal() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456000);
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123455000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		t = Instant.ofEpochSecond(now.getEpochSecond(), 123460000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		t = Instant.ofEpochSecond(now.getEpochSecond(), 123500000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123456000);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
	}

	@Test
	public void compareNanosEqual() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
		assertEquals(0, cmp.compare(s, t));
		assertEquals(0, cmp.compare(t, s));
	}

	@Test
	public void compareNanosUnequal() {
		Instant now = Instant.now();
		Instant t = Instant.ofEpochSecond(now.getEpochSecond(), 123456789);
		Instant s = Instant.ofEpochSecond(now.getEpochSecond(), 123456700);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		t = Instant.ofEpochSecond(now.getEpochSecond(), 123456800);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		s = Instant.ofEpochSecond(now.getEpochSecond() - 1L, 123456789);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
		s = Instant.ofEpochSecond(now.getEpochSecond(), 123456788);
		assertTrue(cmp.compare(s, t) < 0);
		assertTrue(cmp.compare(t, s) > 0);
	}
}