/*
   Copyright (C) 2005-2012, by the President and Fellows of Harvard College.

   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.

   Dataverse Network - A web application to share, preserve and analyze research data.
   Developed at the Institute for Quantitative Social Science, Harvard University.
   Version 3.0.
*/
package edu.harvard.iq.dvn.core.study;

import edu.harvard.iq.dvn.core.admin.VDCUser;
import edu.harvard.iq.dvn.core.mail.MailServiceLocal;
import java.util.Iterator;
import java.util.List;
import javax.ejb.EJB;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

/**
 *
 * @author roberttreacy
 */
@Stateless
public class StudyCommentServiceBean implements StudyCommentService {
    @EJB
    MailServiceLocal mailService;
/*    @EJB
    StudyServiceLocal studyService;
    @EJB
    UserServiceLocal userService;
*/
    @PersistenceContext(unitName="VDCNet-ejbPU")
    private EntityManager em;
    
    @Override
    public void flagStudyCommentAbuse(Long abusiveStudyCommentId, Long flaggerId){
        StudyComment flaggedStudyComment = em.find(StudyComment.class, abusiveStudyCommentId);
        flaggedStudyComment.setStatus(StudyComment.Status.FLAGGED);
        VDCUser flagger = em.find(VDCUser.class, flaggerId);
        flaggedStudyComment.getFlaggedByUsers().add(flagger);
        em.persist(flaggedStudyComment);
    }

    @Override
    public List <StudyComment> getAbusiveStudyComments(){
        return findByStatus(StudyComment.Status.FLAGGED);
    }


    @Override
    public List <StudyComment> getStudyComments(Long studyId){
        String studyCommentsByStudyIdQuery = "Select c from StudyComment c where c.studyVersion.study.id = :commentStudyId and c.status <> :deleted order by c.createTime";
        Query query = em.createQuery(studyCommentsByStudyIdQuery);
        query.setParameter("commentStudyId", studyId);
        query.setParameter("deleted",StudyComment.Status.DELETED);
        List<StudyComment> studyComments = query.getResultList();
        return studyComments;
    }

    @Override
    public List <StudyComment> getStudyComments(){
        List <StudyComment> displayStudies = findByStatus(StudyComment.Status.OK);
        displayStudies.addAll(findByStatus(StudyComment.Status.FLAGGED));
        return displayStudies;
    }

    @Override
    public void okComment(Long commentId, String okMessage){
        StudyComment comment = em.find(StudyComment.class, commentId);
        comment.setStatus(StudyComment.Status.OK);
        em.persist(comment);
        // send mail to flaggedByUsers
        List<VDCUser> flaggedByUsers = (List<VDCUser>)comment.getFlaggedByUsers();
        Iterator iterator = flaggedByUsers.iterator();
        String flaggedByUserEmails= new String("");
        while (iterator.hasNext()) {
            VDCUser vdcuser = (VDCUser)iterator.next();
            if (flaggedByUsers.indexOf(vdcuser) > 0)
                flaggedByUserEmails += ", ";
            flaggedByUserEmails += vdcuser.getEmail();
        }
        if (!flaggedByUserEmails.isEmpty()) {
            mailService.sendDoNotReplyMail(flaggedByUserEmails, "Study Comment Action Ignored", okMessage);
        }
        // clear the list from the flaggedByUser table
        Iterator newIterator = flaggedByUsers.iterator();
        while (newIterator.hasNext()) {
            newIterator.next();
            newIterator.remove();
        }
    }

    @Override
    public void deleteComment(Long deletedStudyCommentId, String deletedMessage){
        StudyComment deletedComment = em.find(StudyComment.class,deletedStudyCommentId);
        deletedComment.setStatus(StudyComment.Status.DELETED);
        em.persist(deletedComment);
        // send mail to flaggedByUsers
        List<VDCUser> flaggedByUsers = (List<VDCUser>)deletedComment.getFlaggedByUsers();
        Iterator iterator = flaggedByUsers.iterator();
        String flaggedByUserEmails= new String("");
        while (iterator.hasNext()) {
            VDCUser vdcuser = (VDCUser)iterator.next();
            if (flaggedByUsers.indexOf(vdcuser) > 0)
                flaggedByUserEmails += ", ";
            flaggedByUserEmails += vdcuser.getEmail();
        }
        if (!flaggedByUserEmails.isEmpty()) { 
            mailService.sendDoNotReplyMail(flaggedByUserEmails, "Study Comment Action Deleted", deletedMessage);
        }
    }

    @Override
    public void addComment(String comment, Long commenterId, Long studyId) {
        Study study = em.find(Study.class, studyId);
        if (study != null){
            VDCUser commenter = em.find(VDCUser.class, commenterId);
            if (commenter != null){
                StudyVersion sv = null;
                if (study.getReleasedVersion() != null) {
                    sv = study.getReleasedVersion();
                } else {
                    throw new IllegalArgumentException("Study does not have released version, study.id = " + study.getId());
                }
                StudyComment studyComment = new StudyComment(comment, commenter, sv);
                studyComment.setStatus(StudyComment.Status.OK);
                sv.getStudyComments().add(studyComment);
                em.persist(study);
            }
        }
    }

    public List<StudyComment> findByStatus(StudyComment.Status status){
        String statusStudyCommentsQuery = "Select c from StudyComment c where c.status = :commentstatus";
        List<StudyComment> studyComments = em.createQuery(statusStudyCommentsQuery).setParameter("commentstatus", status).getResultList();
        Iterator iterator = studyComments.iterator();
        while (iterator.hasNext()) {
            StudyComment studyComment = (StudyComment)iterator.next();
            studyComment.getFlaggedByUsers().size(); // required to load the list from the join table. Otherwise it may not be instantiated.
            studyComment.getFlaggedByUsers();
        }
        return studyComments;
    }
}