/*
 * Copyright 2015-present Open Networking Laboratory
 *
 * 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 org.onosproject.store.service;

import com.google.common.testing.EqualsTester;

import org.junit.Assert;
import org.junit.Test;

import java.lang.reflect.Constructor;
import java.util.Arrays;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.notNullValue;

/**
 * MultiValuedTimestamp unit tests.
 */
public class MultiValuedTimestampTest {

    private final MultiValuedTimestamp<Integer, Integer> stats1 = new MultiValuedTimestamp<>(1, 3);

    private final MultiValuedTimestamp<Integer, Integer> stats2 = new MultiValuedTimestamp<>(1, 2);


    /**
     * Tests the creation of the MapEvent object.
     */
    @Test
    public void testConstruction() {
        assertThat(stats1.value1(), is(1));
        assertThat(stats1.value2(), is(3));
    }

    /**
     * Tests the toCompare function.
     */
    @Test
    public void testToCompare() {
        assertThat(stats1.compareTo(stats2), is(1));
    }

    /**
     * Tests the equals, hashCode and toString methods using Guava EqualsTester.
     */
    @Test
    public void testEquals() {
        new EqualsTester()
                .addEqualityGroup(stats1, stats1)
                .addEqualityGroup(stats2)
                .testEquals();
    }

    /**
     * Tests that the empty argument list constructor for serialization
     * is present and creates a proper object.
     */
    @Test
    public void testSerializerConstructor() {
        try {
            Constructor[] constructors = MultiValuedTimestamp.class.getDeclaredConstructors();
            assertThat(constructors, notNullValue());
            Arrays.stream(constructors).filter(ctor ->
                    ctor.getParameterTypes().length == 0)
                    .forEach(noParamsCtor -> {
                        try {
                            noParamsCtor.setAccessible(true);
                            MultiValuedTimestamp stats =
                                    (MultiValuedTimestamp) noParamsCtor.newInstance();
                            assertThat(stats, notNullValue());
                        } catch (Exception e) {
                            Assert.fail("Exception instantiating no parameters constructor");
                        }
                    });
        } catch (Exception e) {
            Assert.fail("Exception looking up constructors");
        }
    }
}