/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.util;

import com.hazelcast.test.HazelcastSerialClassRunner;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.After;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import static java.lang.String.format;
import static org.junit.Assert.assertTrue;

@RunWith(HazelcastSerialClassRunner.class)
@Category(QuickTest.class)
public class ClockTest extends AbstractClockTest {

    @After
    public void tearDown() {
        resetClock();
    }

    @Test
    public void testConstructor() {
        assertUtilityConstructor(Clock.class);
    }

    @Test
    public void testCurrentTimeMillis() {
        assertTrue(Clock.currentTimeMillis() > 0);
    }

    @Test
    public void testCreateClock_withDefaults() {
        Clock.ClockImpl clock = Clock.createClock();

        assertInstanceOf(Clock.SystemClock.class, clock);
    }

    @Test
    public void testCreateClock_withClockImpl() {
        setJumpingClock(30);

        Clock.ClockImpl clock = Clock.createClock();

        assertInstanceOf(JumpingSystemClock.class, clock);
    }

    @Test
    public void testCreateClock_withClockOffset() {
        setClockOffset(30);

        Clock.ClockImpl clock = Clock.createClock();

        assertInstanceOf(Clock.SystemOffsetClock.class, clock);
    }

    @Test
    public void testSystemClock() {
        Clock.SystemClock clock = new Clock.SystemClock();

        assertTrue(clock.currentTimeMillis() > 0);
    }

    @Test
    public void testSystemOffsetClock() {
        Clock.SystemOffsetClock clock = new Clock.SystemOffsetClock(-999999999);

        long systemMillis = System.currentTimeMillis();
        sleepSeconds(1);
        long offsetMillis = clock.currentTimeMillis();
        assertTrue(format("SystemOffsetClock should be far behind the normal clock! %d < %d", offsetMillis, systemMillis),
                offsetMillis < systemMillis);
    }
}