/*******************************************************************************
 * Copyright (C) 2007 The University of Manchester
 *
 *  Modifications to the initial code base are copyright of their
 *  respective authors, or their employers as appropriate.
 *
 *  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 2.1 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 ******************************************************************************/
package net.sf.taverna.t2.activities.wsdl.xmlsplitter;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.taverna.t2.activities.wsdl.InputPortTypeDescriptorActivity;
import net.sf.taverna.t2.reference.ReferenceService;
import net.sf.taverna.t2.reference.ReferenceServiceException;
import net.sf.taverna.t2.reference.T2Reference;
import net.sf.taverna.t2.workflowmodel.OutputPort;
import net.sf.taverna.t2.workflowmodel.processor.activity.AbstractAsynchronousActivity;
import net.sf.taverna.t2.workflowmodel.processor.activity.ActivityConfigurationException;
import net.sf.taverna.t2.workflowmodel.processor.activity.AsynchronousActivityCallback;
import net.sf.taverna.wsdl.parser.ArrayTypeDescriptor;
import net.sf.taverna.wsdl.parser.ComplexTypeDescriptor;
import net.sf.taverna.wsdl.parser.TypeDescriptor;
import net.sf.taverna.wsdl.parser.UnknownOperationException;
import net.sf.taverna.wsdl.xmlsplitter.XMLInputSplitter;
import net.sf.taverna.wsdl.xmlsplitter.XMLSplitterSerialisationHelper;

import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

import com.fasterxml.jackson.databind.JsonNode;

/**
 * An activity that replicates the behaviour of the Taverna 1 XMLInputSplitters.
 *
 * @author Stuart Owen
 *
 */
public class XMLInputSplitterActivity extends AbstractAsynchronousActivity<JsonNode> implements InputPortTypeDescriptorActivity {

	public static final String URI = "http://ns.taverna.org.uk/2010/activity/xml-splitter/in";

	JsonNode configBean;
	TypeDescriptor typeDescriptor;

	@Override
	public void configure(JsonNode configBean) throws ActivityConfigurationException {
		this.configBean = configBean;

		try {
			String wrappedType = configBean.get("wrappedType").textValue();
			Element element = new SAXBuilder().build(new StringReader(wrappedType)).getRootElement();
			typeDescriptor = XMLSplitterSerialisationHelper.extensionXMLToTypeDescriptor(element);
		} catch (JDOMException | IOException e) {
			throw new ActivityConfigurationException(e);
		}
	}

	@Override
	public void executeAsynch(final Map<String, T2Reference> data,
			final AsynchronousActivityCallback callback) {
		callback.requestRun(new Runnable() {

			public void run() {
				try {
					ReferenceService referenceService = callback.getContext().getReferenceService();
					XMLInputSplitter splitter = createSplitter();
					Map<String,Object> inputMap = buildInputMap(data,referenceService);
					Map<String,String> outputMap = splitter.execute(inputMap);
					callback.receiveResult(createOutputData(outputMap,referenceService), new int[0]);
				}
				catch(Exception e) {
					callback.fail("Error in XMLInputSplitterActivity",e);
				}
			}

			private Map<String, T2Reference> createOutputData(
					Map<String, String> outputMap,ReferenceService referenceService) throws ReferenceServiceException {
				Map<String,T2Reference> result = new HashMap<String, T2Reference>();
				for (String outputName : outputMap.keySet()) {
					String xmlOut = outputMap.get(outputName);
					result.put(outputName, referenceService.register(xmlOut, 0, true, callback.getContext()));
				}
				return result;
			}

			private XMLInputSplitter createSplitter() {
				List<String> inputNames = new ArrayList<String>();
				List<String> inputTypes = new ArrayList<String>();
				List<String> outputNames = new ArrayList<String>();

				//FIXME: need to use the definition beans for now to get the mimetype. Need to use the actual InputPort once the mimetype becomes available again.
				if (configBean.has("inputPorts")) {
					for (JsonNode inputPort : configBean.get("inputPorts")) {
						inputNames.add(inputPort.get("name").textValue());
						inputTypes.add(inputPort.get("mimeType").textValue());
					}
				}

				for (OutputPort outputPorts : getOutputPorts()) {
					outputNames.add(outputPorts.getName());
				}

				return new XMLInputSplitter(typeDescriptor,inputNames.toArray(new String[]{}),inputTypes.toArray(new String[]{}),outputNames.toArray(new String[]{}));
			}

			private Map<String,Object> buildInputMap(Map<String, T2Reference> data,ReferenceService referenceService) throws ReferenceServiceException {
				Map<String,Object> result = new HashMap<String, Object>();
				for (String inputName : data.keySet()) {
					T2Reference id = data.get(inputName);
					result.put(inputName, referenceService.renderIdentifier(id,String.class, callback.getContext()));

				}
				return result;
			}
		});

	}

	@Override
	public JsonNode getConfiguration() {
		return configBean;
	}

	/**
	 * Returns a TypeDescriptor for the given port name. If the port cannot be found, or is not based upon a complex type, then null is returned.
	 * @param portName
	 * @return
	 */
	public TypeDescriptor getTypeDescriptorForInputPort(String portName) {
		TypeDescriptor result = null;
		if (typeDescriptor instanceof ComplexTypeDescriptor) {
			for (TypeDescriptor desc : ((ComplexTypeDescriptor)typeDescriptor).getElements()) {
				if (desc.getName().equals(portName)) {
					result = desc;
					break;
				}
			}
		}
		else if (typeDescriptor instanceof ArrayTypeDescriptor) {
			TypeDescriptor desc = ((ArrayTypeDescriptor)typeDescriptor).getElementType();

			if (typeDescriptor.getName().equals(portName)) {
				result = desc;
			}
		}
		return result;
	}

	/**
	 * {@inheritDoc}
	 *
	 */
	public Map<String, TypeDescriptor> getTypeDescriptorsForInputPorts()
			throws UnknownOperationException, IOException {
		Map<String, TypeDescriptor> descriptors = new HashMap<String, TypeDescriptor>();
		if (typeDescriptor instanceof ComplexTypeDescriptor) {
			for (TypeDescriptor desc : ((ComplexTypeDescriptor)typeDescriptor).getElements()) {
				descriptors.put(desc.getName(), desc);
			}
		}
		else if (typeDescriptor instanceof ArrayTypeDescriptor) {
			TypeDescriptor desc = ((ArrayTypeDescriptor)typeDescriptor).getElementType();
			descriptors.put(typeDescriptor.getName(), desc);
		}
		return descriptors;
	}
}