/*
 * Copyright 2019 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.optaweb.vehiclerouting.plugin.planner.change;

import java.util.Objects;

import org.optaplanner.core.api.score.director.ScoreDirector;
import org.optaplanner.core.api.solver.ProblemFactChange;
import org.optaweb.vehiclerouting.plugin.planner.domain.PlanningVehicle;
import org.optaweb.vehiclerouting.plugin.planner.domain.VehicleRoutingSolution;

public class ChangeVehicleCapacity implements ProblemFactChange<VehicleRoutingSolution> {

    private final PlanningVehicle vehicle;

    public ChangeVehicleCapacity(PlanningVehicle vehicle) {
        this.vehicle = Objects.requireNonNull(vehicle);
    }

    @Override
    public void doChange(ScoreDirector<VehicleRoutingSolution> scoreDirector) {
        PlanningVehicle workingVehicle = scoreDirector.lookUpWorkingObject(vehicle);
        if (workingVehicle == null) {
            throw new IllegalStateException("Can't look up a working copy of " + vehicle);
        }

        // No need to clone the workingVehicle because it is a planning entity, so it is already planning-cloned.
        // To learn more about problem fact changes, see:
        // https://docs.jboss.org/optaplanner/release/latest/optaplanner-docs/html_single/#problemFactChangeExample

        scoreDirector.beforeProblemPropertyChanged(workingVehicle);
        workingVehicle.setCapacity(vehicle.getCapacity());
        scoreDirector.afterProblemPropertyChanged(workingVehicle);

        scoreDirector.triggerVariableListeners();
    }
}
