/*
 * 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.constructionheuristic;

import static org.assertj.core.api.Assertions.assertThat;
import static org.optaplanner.core.impl.testdata.util.PlannerAssert.assertCode;

import java.util.Arrays;
import java.util.Collections;

import org.junit.jupiter.api.Test;
import org.optaplanner.core.config.constructionheuristic.ConstructionHeuristicPhaseConfig;
import org.optaplanner.core.config.solver.SolverConfig;
import org.optaplanner.core.impl.testdata.domain.TestdataEntity;
import org.optaplanner.core.impl.testdata.domain.TestdataSolution;
import org.optaplanner.core.impl.testdata.domain.TestdataValue;
import org.optaplanner.core.impl.testdata.domain.pinned.TestdataPinnedEntity;
import org.optaplanner.core.impl.testdata.domain.pinned.TestdataPinnedSolution;
import org.optaplanner.core.impl.testdata.util.PlannerTestUtils;

public class DefaultConstructionHeuristicPhaseTest {

    @Test
    public void solveWithInitializedEntities() {
        SolverConfig solverConfig = PlannerTestUtils.buildSolverConfig(
                TestdataSolution.class, TestdataEntity.class);
        solverConfig.setPhaseConfigList(Collections.singletonList(new ConstructionHeuristicPhaseConfig()));

        TestdataSolution solution = new TestdataSolution("s1");
        TestdataValue v1 = new TestdataValue("v1");
        TestdataValue v2 = new TestdataValue("v2");
        TestdataValue v3 = new TestdataValue("v3");
        solution.setValueList(Arrays.asList(v1, v2, v3));
        solution.setEntityList(Arrays.asList(
                new TestdataEntity("e1", null),
                new TestdataEntity("e2", v2),
                new TestdataEntity("e3", v1)));

        solution = PlannerTestUtils.solve(solverConfig, solution);
        assertThat(solution).isNotNull();
        TestdataEntity solvedE1 = solution.getEntityList().get(0);
        assertCode("e1", solvedE1);
        assertThat(solvedE1.getValue()).isNotNull();
        TestdataEntity solvedE2 = solution.getEntityList().get(1);
        assertCode("e2", solvedE2);
        assertThat(solvedE2.getValue()).isEqualTo(v2);
        TestdataEntity solvedE3 = solution.getEntityList().get(2);
        assertCode("e3", solvedE3);
        assertThat(solvedE3.getValue()).isEqualTo(v1);
        assertThat(solution.getScore().getInitScore()).isEqualTo(0);
    }

    @Test
    public void solveWithPinnedEntities() {
        SolverConfig solverConfig =
                PlannerTestUtils.buildSolverConfig(TestdataPinnedSolution.class, TestdataPinnedEntity.class);
        solverConfig.setPhaseConfigList(Collections.singletonList(new ConstructionHeuristicPhaseConfig()));

        TestdataPinnedSolution solution = new TestdataPinnedSolution("s1");
        TestdataValue v1 = new TestdataValue("v1");
        TestdataValue v2 = new TestdataValue("v2");
        TestdataValue v3 = new TestdataValue("v3");
        solution.setValueList(Arrays.asList(v1, v2, v3));
        solution.setEntityList(Arrays.asList(
                new TestdataPinnedEntity("e1", null, false, false),
                new TestdataPinnedEntity("e2", v2, true, false),
                new TestdataPinnedEntity("e3", null, false, true)));

        solution = PlannerTestUtils.solve(solverConfig, solution);
        assertThat(solution).isNotNull();
        TestdataPinnedEntity solvedE1 = solution.getEntityList().get(0);
        assertCode("e1", solvedE1);
        assertThat(solvedE1.getValue()).isNotNull();
        TestdataPinnedEntity solvedE2 = solution.getEntityList().get(1);
        assertCode("e2", solvedE2);
        assertThat(solvedE2.getValue()).isEqualTo(v2);
        TestdataPinnedEntity solvedE3 = solution.getEntityList().get(2);
        assertCode("e3", solvedE3);
        assertThat(solvedE3.getValue()).isEqualTo(null);
        assertThat(solution.getScore().getInitScore()).isEqualTo(-1);
    }

    @Test
    public void solveWithEmptyEntityList() {
        SolverConfig solverConfig = PlannerTestUtils.buildSolverConfig(TestdataSolution.class, TestdataEntity.class);
        solverConfig.setPhaseConfigList(Collections.singletonList(new ConstructionHeuristicPhaseConfig()));

        TestdataSolution solution = new TestdataSolution("s1");
        TestdataValue v1 = new TestdataValue("v1");
        TestdataValue v2 = new TestdataValue("v2");
        TestdataValue v3 = new TestdataValue("v3");
        solution.setValueList(Arrays.asList(v1, v2, v3));
        solution.setEntityList(Collections.emptyList());

        solution = PlannerTestUtils.solve(solverConfig, solution);
        assertThat(solution).isNotNull();
        assertThat(solution.getEntityList().size()).isEqualTo(0);
    }

}
