/*
 * Copyright (c) 2010-2012 Lockheed Martin Corporation
 *
 * 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.eurekastreams.server.persistence.mappers.db.notification;

import javax.persistence.Query;

import org.eurekastreams.server.domain.EntityType;
import org.eurekastreams.server.persistence.mappers.BaseArgDomainMapper;
import org.eurekastreams.server.persistence.mappers.requests.ChangeStreamActivitySubscriptionMapperRequest;

/**
 * Mapper to update a user's notification preference for new activities for a specific stream.
 */
public class ChangeStreamActivitySubscriptionDbMapper extends
        BaseArgDomainMapper<ChangeStreamActivitySubscriptionMapperRequest, Boolean>
{
    /** Query string. */
    private final String queryString;

    /** Use extra params. */
    private boolean extraParams;

    /**
     * Constructor.
     *
     * @param entityType
     *            Entity type of streams to operate on.
     */
    public ChangeStreamActivitySubscriptionDbMapper(final EntityType entityType)
    {
        String entityName;
        String extraFields = "";

        switch (entityType)
        {
        case PERSON:
            entityName = "Follower";
            break;
        case GROUP:
            entityName = "GroupFollower";
            extraFields = ", coordinatorOnlyNotifications = :coordinatorOnlyNotifications";
            extraParams = true;
            break;
        default:
            throw new IllegalArgumentException("Entity type " + entityType + " not allowed.  Only PERSON and GROUP.");
        }

        queryString = "UPDATE " + entityName
                + " SET receiveNewActivityNotifications = :receiveNewActivityNotifications " + extraFields
                + " WHERE pk.followerId = :personId AND pk.followingId = :streamEntityId";
    }

    /**
     * Update the person's new activity notifications for a group that they are a member of.
     *
     * @param inRequest
     *            the ChangeGroupActivitySubscriptionMapperRequest containing the person id, group id, and notification
     *            setting
     * @return true
     */
    @Override
    public Boolean execute(final ChangeStreamActivitySubscriptionMapperRequest inRequest)
    {
        boolean receiveNewActivityNotifications = inRequest.getReceiveNewActivityNotifications();
        boolean coordinatorOnlyNotifications = receiveNewActivityNotifications
                && inRequest.getCoordinatorOnlyNotifications();
        Query query = getEntityManager().createQuery(queryString)
                .setParameter("receiveNewActivityNotifications", receiveNewActivityNotifications)
                .setParameter("personId", inRequest.getSubscriberPersonId())
                .setParameter("streamEntityId", inRequest.getStreamEntityId());
        if (extraParams)
        {
            query.setParameter("coordinatorOnlyNotifications", coordinatorOnlyNotifications);
        }
        query.executeUpdate();

        return null;
    }
}