/*
 * 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.quarkus.deployment;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatCode;
import static org.mockito.Mockito.*;

import java.util.Collections;
import java.util.Optional;

import org.jboss.jandex.IndexView;
import org.junit.jupiter.api.Test;
import org.optaplanner.core.api.score.stream.ConstraintProvider;
import org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig;
import org.optaplanner.core.config.solver.SolverConfig;
import org.optaplanner.quarkus.deployment.config.OptaPlannerBuildTimeConfig;

import io.quarkus.deployment.Capabilities;

class OptaPlannerProcessorTest {

    @Test
    void customScoreDrl_overrides_solverConfig() {
        ScoreDirectorFactoryConfig scoreDirectorFactoryConfig = new ScoreDirectorFactoryConfig()
                .withScoreDrls("config_constraints.drl");
        SolverConfig solverConfig = new SolverConfig().withScoreDirectorFactory(scoreDirectorFactoryConfig);
        OptaPlannerProcessor optaPlannerProcessor = mockOptaPlannerProcessor();
        when(optaPlannerProcessor.constraintsDrl()).thenReturn(Optional.of("some.drl"));

        Capabilities capabilities = new Capabilities(Collections.singleton("kogito-rules"));
        optaPlannerProcessor.applyScoreDirectorFactoryProperties(mock(IndexView.class), solverConfig, capabilities);
        assertThat(scoreDirectorFactoryConfig.getScoreDrlList()).containsExactly("some.drl");
    }

    @Test
    void defaultScoreDrl_does_not_override_solverConfig() {
        ScoreDirectorFactoryConfig scoreDirectorFactoryConfig = new ScoreDirectorFactoryConfig()
                .withScoreDrls("config_constraints.drl");
        SolverConfig solverConfig = new SolverConfig().withScoreDirectorFactory(scoreDirectorFactoryConfig);
        OptaPlannerProcessor optaPlannerProcessor = mockOptaPlannerProcessor();
        when(optaPlannerProcessor.constraintsDrl()).thenReturn(Optional.empty());
        when(optaPlannerProcessor.defaultConstraintsDrl())
                .thenReturn(Optional.of(OptaPlannerBuildTimeConfig.DEFAULT_CONSTRAINTS_DRL_URL));

        Capabilities capabilities = new Capabilities(Collections.singleton("kogito-rules"));
        optaPlannerProcessor.applyScoreDirectorFactoryProperties(mock(IndexView.class), solverConfig, capabilities);
        assertThat(scoreDirectorFactoryConfig.getScoreDrlList())
                .containsExactly("config_constraints.drl");
    }

    @Test
    void defaultScoreDrl_applies_if_solverConfig_does_not_define_scoreDrl() {
        ScoreDirectorFactoryConfig scoreDirectorFactoryConfig = new ScoreDirectorFactoryConfig();
        SolverConfig solverConfig = new SolverConfig().withScoreDirectorFactory(scoreDirectorFactoryConfig);
        OptaPlannerProcessor optaPlannerProcessor = mockOptaPlannerProcessor();
        when(optaPlannerProcessor.constraintsDrl()).thenReturn(Optional.empty());
        when(optaPlannerProcessor.defaultConstraintsDrl())
                .thenReturn(Optional.of(OptaPlannerBuildTimeConfig.DEFAULT_CONSTRAINTS_DRL_URL));

        Capabilities capabilities = new Capabilities(Collections.singleton("kogito-rules"));
        optaPlannerProcessor.applyScoreDirectorFactoryProperties(mock(IndexView.class), solverConfig, capabilities);
        assertThat(scoreDirectorFactoryConfig.getScoreDrlList())
                .containsExactly(OptaPlannerBuildTimeConfig.DEFAULT_CONSTRAINTS_DRL_URL);
    }

    @Test
    void error_if_drools_is_used_and_kogito_rules_capability_is_not_present() {
        ScoreDirectorFactoryConfig scoreDirectorFactoryConfig = new ScoreDirectorFactoryConfig();
        SolverConfig solverConfig = new SolverConfig().withScoreDirectorFactory(scoreDirectorFactoryConfig);
        OptaPlannerProcessor optaPlannerProcessor = mockOptaPlannerProcessor();
        when(optaPlannerProcessor.constraintsDrl()).thenReturn(Optional.empty());
        when(optaPlannerProcessor.defaultConstraintsDrl())
                .thenReturn(Optional.of(OptaPlannerBuildTimeConfig.DEFAULT_CONSTRAINTS_DRL_URL));

        Capabilities capabilities = new Capabilities(Collections.emptySet());
        assertThatCode(() -> optaPlannerProcessor.applyScoreDirectorFactoryProperties(mock(IndexView.class), solverConfig,
                capabilities))
                        .isInstanceOf(IllegalStateException.class)
                        .hasMessage(
                                "Using scoreDRL in Quarkus, but the dependency org.kie.kogito:kogito-quarkus-rules is not on the classpath."
                                        + "\nMaybe add the dependency org.kie.kogito:kogito-quarkus-rules"
                                        + "\nMaybe use a " + ConstraintProvider.class.getSimpleName()
                                        + " instead of the scoreDRL.");
        assertThat(scoreDirectorFactoryConfig.getScoreDrlList())
                .containsExactly(OptaPlannerBuildTimeConfig.DEFAULT_CONSTRAINTS_DRL_URL);
    }

    private OptaPlannerProcessor mockOptaPlannerProcessor() {
        OptaPlannerProcessor optaPlannerProcessor = mock(OptaPlannerProcessor.class);
        doCallRealMethod().when(optaPlannerProcessor).applyScoreDirectorFactoryProperties(any(), any(), any());
        return optaPlannerProcessor;
    }
}
