/*
 * Copyright 2020 Red Hat, Inc. and/or its affiliates.
 *
 * 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.optaplanner.core.impl.domain.variable.inverserelation;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.util.Arrays;

import org.junit.jupiter.api.Test;
import org.optaplanner.core.api.score.director.ScoreDirector;
import org.optaplanner.core.impl.domain.variable.descriptor.GenuineVariableDescriptor;
import org.optaplanner.core.impl.testdata.domain.chained.TestdataChainedAnchor;
import org.optaplanner.core.impl.testdata.domain.chained.TestdataChainedEntity;
import org.optaplanner.core.impl.testdata.domain.chained.TestdataChainedSolution;

public class ExternalizedSingletonInverseVariableSupplyTest {

    @Test
    public void chainedEntity() {
        GenuineVariableDescriptor<TestdataChainedSolution> variableDescriptor =
                TestdataChainedEntity.buildVariableDescriptorForChainedObject();
        ScoreDirector<TestdataChainedSolution> scoreDirector = mock(ScoreDirector.class);
        ExternalizedSingletonInverseVariableSupply<TestdataChainedSolution> supply =
                new ExternalizedSingletonInverseVariableSupply<>(variableDescriptor);

        TestdataChainedAnchor a0 = new TestdataChainedAnchor("a0");
        TestdataChainedEntity a1 = new TestdataChainedEntity("a1", a0);
        TestdataChainedEntity a2 = new TestdataChainedEntity("a2", a1);
        TestdataChainedEntity a3 = new TestdataChainedEntity("a3", a2);

        TestdataChainedAnchor b0 = new TestdataChainedAnchor("b0");
        TestdataChainedEntity b1 = new TestdataChainedEntity("b1", b0);

        TestdataChainedSolution solution = new TestdataChainedSolution("solution");
        solution.setChainedAnchorList(Arrays.asList(a0, b0));
        solution.setChainedEntityList(Arrays.asList(a1, a2, a3, b1));

        when(scoreDirector.getWorkingSolution()).thenReturn(solution);
        supply.resetWorkingSolution(scoreDirector);

        assertThat(supply.getInverseSingleton(a0)).isSameAs(a1);
        assertThat(supply.getInverseSingleton(a1)).isSameAs(a2);
        assertThat(supply.getInverseSingleton(a2)).isSameAs(a3);
        assertThat(supply.getInverseSingleton(a3)).isSameAs(null);
        assertThat(supply.getInverseSingleton(b0)).isSameAs(b1);
        assertThat(supply.getInverseSingleton(b1)).isSameAs(null);

        supply.beforeVariableChanged(scoreDirector, a3);
        a3.setChainedObject(b1);
        supply.afterVariableChanged(scoreDirector, a3);

        assertThat(supply.getInverseSingleton(a2)).isSameAs(null);
        assertThat(supply.getInverseSingleton(b1)).isSameAs(a3);

        supply.close();
    }

}
