/*
 *  eXist Open Source Native XML Database: Extension module
 *  Copyright (C) 2008 Josef Willenborg
 *  jwillenborg@mpiwg-berlin.mpg.de
 *  http://www.mpiwg-berlin.mpg.de
 *  
 *  This program 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 2
 *  of the License, or (at your option) any later version.
 *  
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *  
 *  $Id: TextModule.java $
 */
package org.exist.xquery.modules.mpdldoc;

import org.exist.dom.QName;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.StringValue;
import org.exist.xquery.value.Type;
import org.exist.xquery.value.ValueSequence;

import de.mpg.mpiwg.berlin.mpdl.exception.ApplicationException;
import de.mpg.mpiwg.berlin.mpdl.schedule.MpdlChainScheduler;
import de.mpg.mpiwg.berlin.mpdl.schedule.MpdlDocOperation;

/**
 * @author Josef Willenborg (jwillenborg@mpiwg-berlin.mpg.de)
 */
public class MpdlDocOperationStarter extends BasicFunction {

	public final static FunctionSignature signature =
		new FunctionSignature(
			new QName("do", MPDLDocModule.NAMESPACE_URI, MPDLDocModule.PREFIX),
      "A function which performs/schedules an operation (insert, update or delete) for the given source file (given by local file path) " +
      "to the destination (given by document base, language and fileName) both to eSciDoc and eXist." +
      "It returns a node which contains information about the scheduled operation (jobId etc.).",
			new SequenceType[] { new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE), 
                           new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
                           new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
                           new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
                           new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
                           new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
			                     new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE) },
			new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE));

	public MpdlDocOperationStarter(XQueryContext context) {
		super(context, signature);
	}

	public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
    Sequence firstSeq = args[0];
    Sequence secondSeq = args[1];
	  Sequence thirdSeq = args[2];
    Sequence fourthSeq = args[3];
    Sequence fifthSeq = args[4];
    Sequence sixthSeq = args[5];
    Sequence seventhSeq = args[6];
    if (firstSeq.isEmpty() || secondSeq.isEmpty() || thirdSeq.isEmpty() || fourthSeq.isEmpty() || fifthSeq.isEmpty() || sixthSeq.isEmpty() || seventhSeq.isEmpty())
      return Sequence.EMPTY_SEQUENCE;
    String operationName = firstSeq.getStringValue();
    String srcUrl = secondSeq.getStringValue();
    String uploadFileName = thirdSeq.getStringValue();
    String docBase = fourthSeq.getStringValue();
    String language = fifthSeq.getStringValue();
    String fileName = sixthSeq.getStringValue();
    String eSciDocCookieId = seventhSeq.getStringValue();
		MpdlDocOperation docOperation = new MpdlDocOperation(operationName, srcUrl, uploadFileName, docBase, language, fileName);	
    docOperation.setESciDocCookieId(eSciDocCookieId);
    try { 
  		MpdlChainScheduler scheduler = MpdlChainScheduler.getInstance();
  		docOperation = scheduler.doOperation(docOperation);
    } catch (ApplicationException e) {
      throw new XPathException(e);
    }
    int jobId = docOperation.getOrderId();
    ValueSequence resultSequence = new ValueSequence();
    StringValue strValItems = new StringValue(String.valueOf(jobId));
    resultSequence.add(strValItems);
    return resultSequence;
	}
	
}