package com.armedia.acm.plugins.casefile.service;

import com.armedia.acm.core.exceptions.AcmAccessControlException;

/*-
 * #%L
 * ACM Default Plugin: Case File
 * %%
 * Copyright (C) 2014 - 2018 ArkCase LLC
 * %%
 * This file is part of the ArkCase software. 
 * 
 * If the software was purchased under a paid ArkCase license, the terms of 
 * the paid license agreement will prevail.  Otherwise, the software is 
 * provided under the following open source license terms:
 * 
 * ArkCase is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *  
 * ArkCase is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with ArkCase. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */

import com.armedia.acm.core.exceptions.AcmCreateObjectFailedException;
import com.armedia.acm.core.exceptions.AcmObjectNotFoundException;
import com.armedia.acm.core.exceptions.AcmUserActionFailedException;
import com.armedia.acm.plugins.casefile.dao.CaseFileDao;
import com.armedia.acm.plugins.casefile.exceptions.AcmCaseFileNotFound;
import com.armedia.acm.plugins.casefile.exceptions.MergeCaseFilesException;
import com.armedia.acm.plugins.casefile.model.CaseFile;
import com.armedia.acm.plugins.casefile.model.MergeCaseOptions;
import com.armedia.acm.plugins.ecm.dao.EcmFileDao;
import com.armedia.acm.plugins.ecm.exception.AcmFolderException;
import com.armedia.acm.plugins.ecm.model.AcmFolder;
import com.armedia.acm.plugins.ecm.service.AcmFolderService;
import com.armedia.acm.plugins.objectassociation.model.ObjectAssociation;
import com.armedia.acm.services.participants.dao.AcmParticipantDao;
import com.armedia.acm.services.participants.model.AcmParticipant;
import com.armedia.acm.services.participants.model.ParticipantTypes;
import com.armedia.acm.services.participants.service.AcmParticipantService;
import com.armedia.acm.services.pipeline.exception.PipelineProcessException;

import org.apache.commons.lang.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.security.core.Authentication;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MergeCaseServiceImpl implements MergeCaseService
{
    private final Logger log = LogManager.getLogger(getClass());

    private SaveCaseService saveCaseService;
    private CaseFileDao caseFileDao;
    private AcmFolderService acmFolderService;
    private EcmFileDao ecmFileDao;
    private List<String> excludeDocumentTypesList;
    private AcmParticipantService acmParticipantService;
    private AcmParticipantDao acmParticipantDao;

    @Override
    @Transactional
    public CaseFile mergeCases(Authentication auth, String ipAddress, MergeCaseOptions mergeCaseOptions)
            throws PipelineProcessException, MergeCaseFilesException, AcmUserActionFailedException, AcmCreateObjectFailedException,
            AcmAccessControlException
    {

        CaseFile source = caseFileDao.find(mergeCaseOptions.getSourceCaseFileId());
        if (source == null)
            throw new AcmCaseFileNotFound("Source Case File with id = " + mergeCaseOptions.getSourceCaseFileId() + " not found");
        if (hasBeenMerged(source))
            throw new MergeCaseFilesException("Source is already merged");
        CaseFile target = caseFileDao.find(mergeCaseOptions.getTargetCaseFileId());
        if (target == null)
            throw new AcmCaseFileNotFound("Target Case File with id = " + mergeCaseOptions.getTargetCaseFileId() + " not found");
        log.info("Going to merge {} into {}", source.getCaseNumber(), target.getCaseNumber());
        // merge details
        // String sourceDetails = StringUtils.isEmpty(source.getDetails()) ? "" : String.format(MERGE_TEXT_SEPPARATOR,
        // source.getTitle(), source.getCaseNumber()) + source.getDetails();
        // target.setDetails(!StringUtils.isEmpty(target.getDetails()) ?
        // target.getDetails() + sourceDetails :
        // sourceDetails);

        // merge folders and documents
        mergeFoldersAndDocuments(source, target);

        ObjectAssociation childObjectSource = new ObjectAssociation();
        childObjectSource.setAssociationType("REFERENCE");
        childObjectSource.setCategory("MERGED_TO");
        childObjectSource.setTargetId(target.getId());
        childObjectSource.setTargetType(target.getObjectType());
        childObjectSource.setTargetTitle(target.getTitle());
        childObjectSource.setTargetName(target.getCaseNumber());
        source.addChildObject(childObjectSource);

        ObjectAssociation childObjectTarget = new ObjectAssociation();
        childObjectTarget.setAssociationType("REFERENCE");
        childObjectTarget.setCategory("MERGED_FROM");
        childObjectTarget.setTargetId(source.getId());
        childObjectTarget.setTargetType(source.getObjectType());
        childObjectTarget.setTargetTitle(source.getTitle());
        childObjectTarget.setTargetName(source.getCaseNumber());
        target.addChildObject(childObjectTarget);

        source.setStatus("CLOSED");

        // set current user as assignee
        handleParticipants(auth, target);

        saveCaseService.saveCase(source, auth, ipAddress);
        target = saveCaseService.saveCase(target, auth, ipAddress);

        return target;
    }

    private void handleParticipants(Authentication auth, CaseFile target) throws MergeCaseFilesException, AcmAccessControlException
    {
        // 1. if current user is already assignee do nothing
        // 2. change case file assignee into follower
        // 2.1. if current user is follower, change is into assignee
        // 2.2. if current user is not participant, than add it as assignee

        // set assignee as follower if exists
        if (target.getParticipants() != null)
        {
            AcmParticipant foundAssignee = null;
            for (AcmParticipant ap : target.getParticipants())
            {
                if (ParticipantTypes.ASSIGNEE.equals(ap.getParticipantType()))
                {
                    try
                    {
                        foundAssignee = ap;
                        break;
                    }
                    catch (Exception e)
                    {
                        throw new MergeCaseFilesException("Unable to change role on " + ap.toString() + " into follower.", e);
                    }
                }
            }
            if (foundAssignee != null)
            {
                if (foundAssignee.getParticipantLdapId().equals(auth.getName()))
                    return;
                foundAssignee.setParticipantType(ParticipantTypes.FOLLOWER);
                getAcmParticipantDao().save(foundAssignee);
                // the assignment rules may have given us a new default assignee, if so find it and update it.
                AcmParticipant defaultAssigneeFromRules = acmParticipantService
                        .listAllParticipantsPerObjectTypeAndId(target.getObjectType(),
                                target.getId())
                        .stream().filter(ap -> ParticipantTypes.ASSIGNEE.equals(ap.getParticipantType()))
                        .findFirst().orElse(null);
                if (defaultAssigneeFromRules != null)
                {
                    defaultAssigneeFromRules.setParticipantLdapId(auth.getName());
                    getAcmParticipantDao().save(defaultAssigneeFromRules);
                }
                else
                {
                    AcmParticipant addedAssignee = acmParticipantService.saveParticipant(auth.getName(), ParticipantTypes.ASSIGNEE,
                            target.getId(), target.getObjectType());
                    target.getParticipants().add(addedAssignee);
                }
            }
            else
            {
                AcmParticipant addedAssignee = acmParticipantService.saveParticipant(auth.getName(), ParticipantTypes.ASSIGNEE,
                        target.getId(), target.getObjectType());
                target.getParticipants().add(addedAssignee);
            }
        }
        else
        {
            // there are no participants in target case file, just add current user as assignee
            AcmParticipant addedAssignee = acmParticipantService.saveParticipant(auth.getName(), ParticipantTypes.ASSIGNEE, target.getId(),
                    target.getObjectType());
            List<AcmParticipant> participants = new ArrayList<>();
            participants.add(addedAssignee);
            target.setParticipants(participants);
        }
        target.getParticipants().forEach(participant -> participant.setReplaceChildrenParticipant(true));
    }

    private boolean hasBeenMerged(CaseFile source)
    {
        // if folder has parent, that means that has been merged
        return source.getContainer().getFolder().getParentFolder() != null;
    }

    private void mergeFoldersAndDocuments(CaseFile source, CaseFile target) throws MergeCaseFilesException
    {
        try
        {
            // remove source ROOT folder from acm_container from db, when source will be saved new ROOT folder will be
            // created
            AcmFolder sourceRootFolder = source.getContainer().getFolder();

            // move source ROOT folder into target ROOT folder
            sourceRootFolder.setName(String.format("%s(%s)", source.getTitle(), source.getCaseNumber()));
            acmFolderService.moveRootFolder(sourceRootFolder, target.getContainer().getFolder());

            // change source case file documents with target's container id
            long documentsUpdated = ecmFileDao.changeContainer(source.getContainer(), target.getContainer(), excludeDocumentTypesList);
            log.info("moved {} documents  from container id={} to container id={}", documentsUpdated, source.getContainer().getId(),
                    target.getContainer().getId());

        }
        catch (AcmFolderException | AcmUserActionFailedException | AcmObjectNotFoundException e)
        {
            throw new MergeCaseFilesException("Error merging case files. Exception in moving documents and folders.", e);
        }
    }

    public void setSaveCaseService(SaveCaseService saveCaseService)
    {
        this.saveCaseService = saveCaseService;
    }

    public void setCaseFileDao(CaseFileDao caseFileDao)
    {
        this.caseFileDao = caseFileDao;
    }

    public void setAcmFolderService(AcmFolderService acmFolderService)
    {
        this.acmFolderService = acmFolderService;
    }

    public void setEcmFileDao(EcmFileDao ecmFileDao)
    {
        this.ecmFileDao = ecmFileDao;
    }

    public void setAcmParticipantService(AcmParticipantService acmParticipantService)
    {
        this.acmParticipantService = acmParticipantService;
    }

    public void setExcludeDocumentTypes(String excludeDocumentTypes)
    {
        this.excludeDocumentTypesList = !StringUtils.isEmpty(excludeDocumentTypes)
                ? Arrays.asList(excludeDocumentTypes.trim().replaceAll(",[\\s]*", ",").split(","))
                : new ArrayList<>();
    }

    public AcmParticipantDao getAcmParticipantDao()
    {
        return acmParticipantDao;
    }

    public void setAcmParticipantDao(AcmParticipantDao acmParticipantDao)
    {
        this.acmParticipantDao = acmParticipantDao;
    }
}