/*
 * 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.predicates;

import com.hazelcast.query.impl.Index;
import com.hazelcast.query.impl.QueryContext;
import com.hazelcast.query.impl.QueryableEntry;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.annotation.ParallelTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.util.Set;

import static org.hamcrest.Matchers.containsString;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verifyZeroInteractions;
import static org.mockito.Mockito.when;

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

    @Test
    public void negate_thenReturnEqualPredicate() {
        NotEqualPredicate notEqualPredicate = new NotEqualPredicate("foo", 1);
        EqualPredicate negate = (EqualPredicate) notEqualPredicate.negate();

        assertEquals("foo", negate.attributeName);
        assertEquals(1, negate.value);
    }

    @Test
    public void hasDefaultConstructor() {
        // it's needed for serialization, it will fail when default constructor is removed by mistake
        new NotEqualPredicate();
    }

    @Test
    public void apply_givenAttributeValueIsNull_whenEntryHasTheAttributeNull_thenReturnFalse() {
        NotEqualPredicate name = new NotEqualPredicate("name", null);

        QueryableEntry mockEntry = newMockEntry(null);

        boolean result = name.apply(mockEntry);
        assertFalse(result);
    }

    @Test
    public void apply_givenAttributeValueIsNull_whenEntryHasTheAttributeIsNotNull_thenReturnTrue() {
        NotEqualPredicate name = new NotEqualPredicate("name", null);

        QueryableEntry mockEntry = newMockEntry("foo");

        boolean result = name.apply(mockEntry);
        assertTrue(result);
    }

    @Test
    public void apply_givenAttributeValueIsFoo_whenEntryHasEqualAttribute_thenReturnFalse() {
        NotEqualPredicate name = new NotEqualPredicate("name", "foo");

        QueryableEntry mockEntry = newMockEntry("foo");

        boolean result = name.apply(mockEntry);
        assertFalse(result);
    }

    @Test
    public void isIndexed_givenAttributeNameIsFoo_whenTheFooFieldIsIndexed_returnFalse() {
        // see https://github.com/hazelcast/hazelcast/pull/5847
        String fieldName = "name";

        NotEqualPredicate name = new NotEqualPredicate(fieldName, "foo");
        QueryContext queryContext = newMockContextWithIndex(fieldName);

        boolean indexed = name.isIndexed(queryContext);
        assertFalse(indexed);
    }

    @Test
    public void toString_containsAttributeName() {
        String fieldName = "name";
        NotEqualPredicate predicate = new NotEqualPredicate(fieldName, "foo");

        String result = predicate.toString();
        assertThat(result, containsString(fieldName));
    }

    @Test
    public void getId_isConstant() {
        NotEqualPredicate predicate = new NotEqualPredicate("bar", "foo");
        int id = predicate.getId();

        // make sure the ID has not been changed by accident
        assertEquals(id, 9);
    }

    @Test
    public void filter_givenAttributeNameIsFoo_whenTheFooFieldIsIndex_thenReturnsNullAndDoesNotTouchQueryContext() {
        /** see {@link #isIndexed_givenAttributeNameIsFoo_whenTheFooFieldIsIndexed_returnFalse()} */
        String fieldName = "foo";
        NotEqualPredicate predicate = new NotEqualPredicate(fieldName, "foo");

        QueryContext queryContext = newMockContextWithIndex(fieldName);
        Set<QueryableEntry> filter = predicate.filter(queryContext);

        assertNull(filter);
        verifyZeroInteractions(queryContext);
    }

    private QueryContext newMockContextWithIndex(String indexedFieldName) {
        QueryContext queryContext = mock(QueryContext.class);
        Index mockIndex = mock(Index.class);
        when(queryContext.getIndex(indexedFieldName)).thenReturn(mockIndex);

        return queryContext;
    }

    private QueryableEntry newMockEntry(Object attributeValue) {
        QueryableEntry mockEntry = mock(QueryableEntry.class);
        when(mockEntry.getAttributeValue(anyString())).thenReturn(attributeValue);
        return mockEntry;
    }
}