package com.armedia.acm.plugins.ecm.pipeline.presave;

/*-
 * #%L
 * ACM Service: Enterprise Content Management
 * %%
 * 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.plugins.ecm.model.EcmFile;
import com.armedia.acm.plugins.ecm.model.FileUploadStage;
import com.armedia.acm.plugins.ecm.model.ProgressbarDetails;
import com.armedia.acm.plugins.ecm.pipeline.EcmFileTransactionPipelineContext;
import com.armedia.acm.plugins.ecm.service.ProgressIndicatorService;
import com.armedia.acm.plugins.ecm.service.ProgressbarExecutor;
import com.armedia.acm.plugins.ecm.utils.EcmFileCamelUtils;
import com.armedia.acm.services.pipeline.exception.PipelineProcessException;
import com.armedia.acm.services.pipeline.handler.PipelineHandler;

import org.apache.chemistry.opencmis.client.api.Document;
import org.apache.chemistry.opencmis.commons.exceptions.CmisContentAlreadyExistsException;
import org.apache.commons.io.input.CountingInputStream;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.FileInputStream;
import java.io.InputStream;

/**
 * Created by joseph.mcgrady on 9/28/2015.
 */
public class EcmFileNewContentHandler implements PipelineHandler<EcmFile, EcmFileTransactionPipelineContext>
{
    private transient final Logger log = LogManager.getLogger(getClass());

    private EcmFileCamelUtils ecmFileCamelUtils;
    private ProgressIndicatorService progressIndicatorService;

    @Override
    public void execute(EcmFile entity, EcmFileTransactionPipelineContext pipelineContext) throws PipelineProcessException
    {
        if (entity == null)
        {
            throw new PipelineProcessException("ecmFile is null");
        }

        pipelineContext.setFileAlreadyInEcmSystem(pipelineContext.getCmisDocument() != null);

        if (!pipelineContext.getIsAppend() && !pipelineContext.isFileAlreadyInEcmSystem())
        {

            try (InputStream fileInputStream = new FileInputStream(pipelineContext.getFileContents()))
            {
                log.debug("Putting fileInputStream in a decorator stream so that the number of bytes can be counted");
                CountingInputStream countingInputStream = new CountingInputStream(fileInputStream);
                if (StringUtils.isNotEmpty(entity.getUuid()))
                {
                    ProgressbarDetails progressbarDetails = new ProgressbarDetails();
                    progressbarDetails.setProgressbar(true);
                    progressbarDetails.setStage(3);
                    progressbarDetails.setUuid(entity.getUuid());
                    progressbarDetails.setObjectId(pipelineContext.getContainer().getContainerObjectId());
                    progressbarDetails.setObjectType(pipelineContext.getContainer().getContainerObjectType());
                    progressbarDetails.setFileName(entity.getFileName());
                    progressbarDetails.setObjectNumber(pipelineContext.getContainer().getContainerObjectTitle());
                    log.debug("Start stage three for file {}. The file will be written to Alfresco", entity.getFileName());
                    progressIndicatorService.start(countingInputStream, pipelineContext.getFileContents().length(),
                            pipelineContext.getContainer().getContainerObjectId(), pipelineContext.getContainer().getContainerObjectType(),
                            pipelineContext.getFileContents().getName(), pipelineContext.getAuthentication().getName(), progressbarDetails);
                }
                // Adds the file to the ECM content repository as a new document... using the context filename
                // as the filename for the repository.
                String arkcaseFilename = entity.getFileName();
                entity.setFileName(pipelineContext.getOriginalFileName());
                Document newDocument = ecmFileCamelUtils.addFile(entity, pipelineContext.getCmisFolderId(),
                        countingInputStream);
                // now, restore the ArkCase file name
                entity.setFileName(arkcaseFilename);
                pipelineContext.setCmisDocument(newDocument);

            }
            catch (Exception e)
            {
                if (ExceptionUtils.getRootCause(e) instanceof CmisContentAlreadyExistsException)
                {
                    pipelineContext.setFileNameAlreadyInEcmSystem(true);
                }
                log.error("Camel pre save handler failed: {}", e.getMessage(), e);
                ProgressbarExecutor progressbarExecutor = progressIndicatorService.getExecutor(entity.getUuid());
                if (StringUtils.isNotEmpty(entity.getUuid()) && progressbarExecutor != null
                        && progressbarExecutor.getProgressbarDetails().getStage() == FileUploadStage.UPLOAD_CHUNKS_TO_FILESYSTEM.getValue())
                {
                    log.debug("Stop progressbar executor in stage 2, for file {} and set file upload success to {}", entity.getUuid(),
                            false);
                    progressIndicatorService.end(entity.getUuid(), false);
                }
                throw new PipelineProcessException(e);
            }

        }

    }

    @Override
    public void rollback(EcmFile entity, EcmFileTransactionPipelineContext pipelineContext) throws PipelineProcessException
    {
        log.debug("Camel pre save handler rollback called");

        // JPA cannot rollback content in the Alfresco repository so it must be manually deleted
        if (!pipelineContext.getIsAppend() && !pipelineContext.isFileAlreadyInEcmSystem())
        {
            try
            {
                // We need the cmis id of the file in order to delete it
                Document cmisDocument = pipelineContext.getCmisDocument();
                if (cmisDocument == null)
                {
                    throw new Exception("cmisDocument is null");
                }

                // Removes the document from the Alfresco content repository
                ecmFileCamelUtils.deleteFile(entity, cmisDocument.getId());
            }
            catch (Exception e)
            { // since the rollback failed an orphan document will exist in Alfresco
                log.error("rollback of file upload failed: {}", e.getMessage(), e);
                throw new PipelineProcessException(e);
            }
            log.debug("Camel pre save handler rollback ended");
        }
    }

    public ProgressIndicatorService getProgressIndicatorService()
    {
        return progressIndicatorService;
    }

    public void setProgressIndicatorService(ProgressIndicatorService progressIndicatorService)
    {
        this.progressIndicatorService = progressIndicatorService;
    }

    public EcmFileCamelUtils getEcmFileCamelUtils()
    {
        return ecmFileCamelUtils;
    }

    public void setEcmFileCamelUtils(EcmFileCamelUtils ecmFileCamelUtils)
    {
        this.ecmFileCamelUtils = ecmFileCamelUtils;
    }
}