/*
 * 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.query.impl;

import com.hazelcast.query.impl.getters.MultiResult;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.annotation.ParallelTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.util.List;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

@RunWith(HazelcastParallelClassRunner.class)
@Category({QuickTest.class, ParallelTest.class})
public class DefaultValueCollectorTest {

    private DefaultValueCollector collector;

    @Before
    public void setup() {
        collector = new DefaultValueCollector();
    }

    @Test
    public void test_emptyCollector() {
        assertNull(collector.getResult());
    }

    @Test
    public void test_singleObject() {
        collector.addObject(1);

        assertEquals(1, collector.getResult());
    }

    @Test
    public void test_TwoObjects() {
        collector.addObject(1);
        collector.addObject(2);

        List<Integer> results = assertIsMultiResultAndGetResults(collector.getResult());
        assertThat(results, hasSize(2));
        assertThat(results, containsInAnyOrder(1, 2));
    }

    @Test
    public void test_multipleObjects() {
        collector.addObject(1);
        collector.addObject(2);
        collector.addObject(3);

        List<Integer> results = assertIsMultiResultAndGetResults(collector.getResult());
        assertThat(results, hasSize(3));
        assertThat(results, containsInAnyOrder(1, 2, 3));
    }

    @Test
    public void test_multipleObjects_sameValues() {
        collector.addObject(1);
        collector.addObject(1);

        List<Integer> results = assertIsMultiResultAndGetResults(collector.getResult());
        assertThat(results, hasSize(2));
        assertThat(results, containsInAnyOrder(1, 1));
    }

    @Test
    public void test_multipleObjects_includingNull() {
        collector.addObject(1);
        collector.addObject(null);

        List<Integer> results = assertIsMultiResultAndGetResults(collector.getResult());
        assertThat(results, hasSize(2));
        assertThat(results, containsInAnyOrder(1, null));
    }

    @SuppressWarnings("unchecked")
    private <T> List<T> assertIsMultiResultAndGetResults(Object result) {
        assertTrue(result instanceof MultiResult);
        return ((MultiResult<T>) collector.getResult()).getResults();
    }
}