/*
 * Copyright (C) 2009-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco 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.
 *
 * Alfresco 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 Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.transfer;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;

import org.alfresco.repo.transaction.RetryingTransactionHelper;
import org.alfresco.service.cmr.repository.ContentData;
import org.alfresco.service.cmr.repository.ContentService;
import org.alfresco.service.cmr.transfer.TransferException;
import org.alfresco.service.cmr.transfer.TransferProgress;
import org.alfresco.service.cmr.transfer.TransferReceiver;
import org.alfresco.service.cmr.transfer.TransferTarget;
import org.alfresco.service.transaction.TransactionService;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * This class delegates transfer service to the transfer receiver without 
 * using any networking.
 *
 * It is used for unit testing the transfer service without requiring two instance 
 * of the repository to be running.
 *
 * @author Mark Rogers
 */
public class UnitTestInProcessTransmitterImpl implements TransferTransmitter
{
    private static final Log log = LogFactory.getLog(UnitTestInProcessTransmitterImpl.class);
    
    private TransferReceiver receiver;
    
    private ContentService contentService;
    private TransactionService transactionService;
    
    public UnitTestInProcessTransmitterImpl(TransferReceiver receiver, ContentService contentService, TransactionService transactionService)
    {
        this.receiver = receiver;
        this.contentService = contentService;
        this.transactionService = transactionService;
    }
    
    public Transfer begin(final TransferTarget target) throws TransferException
    {
        return transactionService.getRetryingTransactionHelper().doInTransaction(new RetryingTransactionHelper.RetryingTransactionCallback<Transfer>()
        {
            public Transfer execute() throws Throwable
            {
                Transfer transfer = new Transfer();
                String transferId = receiver.start();
                transfer.setTransferId(transferId);
                transfer.setTransferTarget(target);
                return transfer;
            }
        }, false, true);
    }

    public void abort(final Transfer transfer) throws TransferException
    {
        transactionService.getRetryingTransactionHelper().doInTransaction(new RetryingTransactionHelper.RetryingTransactionCallback<Transfer>()
        {
            public Transfer execute() throws Throwable
            {
                String transferId = transfer.getTransferId();
                receiver.cancel(transferId);
                return null;
            }
        }, false, true);
    }

    public void commit(final Transfer transfer) throws TransferException
    {
        transactionService.getRetryingTransactionHelper().doInTransaction(new RetryingTransactionHelper.RetryingTransactionCallback<Transfer>()
        {
            public Transfer execute() throws Throwable
            {
                String transferId = transfer.getTransferId();
                receiver.commit(transferId);
                return null;
            }
        }, false, true);
    }


    public void prepare(Transfer transfer) throws TransferException
    {
        String transferId = transfer.getTransferId();
        receiver.prepare(transferId);
    }

    public void sendContent(Transfer transfer, Set<ContentData> data)
    {
        String transferId = transfer.getTransferId();
        
        for(ContentData content : data)
        {
            String contentUrl = content.getContentUrl();
            String fileName = TransferCommons.URLToPartName(contentUrl);

            InputStream contentStream = getContentService().getRawReader(contentUrl).getContentInputStream();
            receiver.saveContent(transferId, fileName, contentStream);
        }
    }

    public void sendManifest(Transfer transfer, File manifest, OutputStream result) throws TransferException
    {
        try
        {
            String transferId = transfer.getTransferId();
            FileInputStream fs = new FileInputStream(manifest);
            receiver.saveSnapshot(transferId, fs);
            
            // Now get the requsite
            try
            {
                receiver.generateRequsite(transferId, result);
                result.close();
                                   
                return;
                
            }
            catch(IOException ie)
            {
                log.error("Error in unit test code: should not get this", ie);
                return;
            }
           
        }
        catch (FileNotFoundException error)
        {
            throw new TransferException("test error", error);
        }
    }

    public void verifyTarget(TransferTarget target) throws TransferException
    {

    }
    
    public TransferProgress getStatus(Transfer transfer) throws TransferException
    {
        String transferId = transfer.getTransferId();
        return receiver.getStatus(transferId);
    }

    public void setReceiver(TransferReceiver receiver)
    {
        this.receiver = receiver;
    }

    public TransferReceiver getReceiver()
    {
        return receiver;
    }

    private ContentService getContentService()
    {
        return contentService;
    }
    
}