/*
 *   Mylyn Connector for Serena Business Mashups
 * 	 Copyright 2010 Brian Rosenberger (Brutex Network)
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 *   Serena, TeamTrack and Serena Business Mashup are 
 * 	 registered trademarks of SERENA Software Inc.
 */
package net.brutex.mylyn.sbmconnector.core;

import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Set;

import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;

import net.brutex.mylyn.sbmconnector.SBMConnectorPlugin;
import net.brutex.mylyn.sbmconnector.core.model.SBMField;
import net.brutex.mylyn.sbmconnector.core.model.SBMFieldAttributes;
import net.brutex.mylyn.sbmconnector.core.model.SBMFieldTypes;
import net.brutex.mylyn.sbmconnector.core.model.SBMFieldValue;
import net.brutex.mylyn.sbmconnector.core.model.SBMNote;
import net.brutex.mylyn.sbmconnector.core.model.SBMStaticFields;
import net.brutex.mylyn.sbmconnector.core.model.SBMSystemFields;
import net.brutex.mylyn.sbmconnector.ui.SBMRepositorySettingsPage;
import net.brutex.sbm.wsclient.TTItem;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.mylyn.tasks.core.IRepositoryQuery;
import org.eclipse.mylyn.tasks.core.ITaskMapping;
import org.eclipse.mylyn.tasks.core.RepositoryResponse;
import org.eclipse.mylyn.tasks.core.TaskRepository;
import org.eclipse.mylyn.tasks.core.data.AbstractTaskDataHandler;
import org.eclipse.mylyn.tasks.core.data.TaskAttribute;
import org.eclipse.mylyn.tasks.core.data.TaskAttributeMapper;
import org.eclipse.mylyn.tasks.core.data.TaskCommentMapper;
import org.eclipse.mylyn.tasks.core.data.TaskData;

/**
 * The Class SBMTicketDataHandler.
 */
public class SBMTicketDataHandler extends AbstractTaskDataHandler {

	/** The connector. */
	private final SBMRepositoryConnector connector;

	/**
	 * Instantiates a new SBM ticket data handler.
	 * 
	 * @param connector
	 *            the connector
	 */
	public SBMTicketDataHandler(SBMRepositoryConnector connector) {
		this.connector = connector;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.mylyn.tasks.core.data.AbstractTaskDataHandler#getAttributeMapper
	 * (org.eclipse.mylyn.tasks.core.TaskRepository)
	 */
	@Override
	public TaskAttributeMapper getAttributeMapper(TaskRepository taskRepository) {
		return new SBMTicketAttributeMapper(taskRepository);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.mylyn.tasks.core.data.AbstractTaskDataHandler#initializeTaskData
	 * (org.eclipse.mylyn.tasks.core.TaskRepository,
	 * org.eclipse.mylyn.tasks.core.data.TaskData,
	 * org.eclipse.mylyn.tasks.core.ITaskMapping,
	 * org.eclipse.core.runtime.IProgressMonitor)
	 */
	@Override
	public boolean initializeTaskData(TaskRepository repository,
			TaskData taskData, ITaskMapping initializationData,
			IProgressMonitor monitor) throws CoreException {
		monitor.subTask("Initialising task ...");
		taskData.setPartial(true);
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.mylyn.tasks.core.data.AbstractTaskDataHandler#postTaskData
	 * (org.eclipse.mylyn.tasks.core.TaskRepository,
	 * org.eclipse.mylyn.tasks.core.data.TaskData, java.util.Set,
	 * org.eclipse.core.runtime.IProgressMonitor)
	 */
	@Override
	public RepositoryResponse postTaskData(TaskRepository repository,
			TaskData taskData, Set<TaskAttribute> oldAttributes,
			IProgressMonitor monitor) throws CoreException {
		// TODO Auto-generated method stub
		return null;
	}

	/**
	 * Convert.
	 * 
	 * @param repository	the repository
	 * @param ttitem
	 *            the ttitem
	 * @param monitor
	 *            the monitor
	 * @return the task data
	 * @throws CoreException
	 *             the core exception
	 */
	public TaskData convert(TaskRepository repository, TTItem ttitem,
			IProgressMonitor monitor, IRepositoryQuery query)
			throws CoreException {
		SBMClient client = SBMRepositoryConnector.getClient(repository);
		TaskData data = new TaskData(new SBMTicketAttributeMapper(repository),
				SBMConnectorPlugin.CONNECTOR_KIND, repository
						.getRepositoryUrl(), ttitem.getGenericItem().getValue()
						.getItemName().getValue()
						+ " ["
						+ ttitem.getGenericItem().getValue().getItemID()
								.getValue() + "]");
		initializeTaskData(repository, data, null, monitor);
		String fieldlist = "";
		if (repository
				.hasProperty(SBMRepositorySettingsPage.STRING_TABLEFIELDLIST)) {
			fieldlist = repository
					.getProperty(SBMRepositorySettingsPage.STRING_TABLEFIELDLIST);
		}
		// Create Fields for all the generic SBM (system) fields
		monitor.subTask("Creating generic SBM fields...");
		for (SBMSystemFields sysfield : SBMSystemFields.values()) {
			if(!sysfield.hasTaskAttribute()) {
				// skip the field here, because we do not have a
				// matching task attribute to map. The field
				// will be processed in the custom field section
				continue;
			}
			if (!fieldlist.contains("," + sysfield.getValue() + ",")) {
				// do not process custom field when it has not
				// been selected by user in repository settings page
				continue;
			}
			// try to initialize the SBM attribute
			SBMTicketAttribute f = null;
			TaskAttribute attr = null;
			try {
				f = SBMTicketAttribute.valueOf(sysfield.getValue());
			} catch (IllegalArgumentException e) {
				// the field is a valid sbm system field and is set up to
				// have an equivalent in the task attributes. It must have an
				// entry in the SBMTicketAttribute class !
				continue; // we just skip the field 
			}
			
			if (f.getTaskName() != null) {
				attr = data.getRoot().createMappedAttribute(f.getTaskName());
			} else {
				// again the field is set up to have an task attribute
				// equivalent, but it is not set up in SBMAttributes correctly
				continue;
			}
			
			attr.getMetaData().setReadOnly(true); //we do not support writing yet 
			attr.getMetaData().setType(f.getTaskType()); // set the mapped field type
			attr.getMetaData().setLabel(client.getFieldLabel(ttitem, f.getSBMName())); // get and set the field label
			if (f.isVisible()) {
				// field is not hidden, display it by setting KIND_DEFAULT
				attr.getMetaData().setKind(TaskAttribute.KIND_DEFAULT);
			} else {
				// field is hidden
				attr.getMetaData().setKind(null);
			}
			
			attr.setValue(client.getStaticFieldValue(ttitem, f.getSBMName())); // get and set the field value
		}
		monitor.worked(1);
		
		//--------------
		// Custom fields
		//--------------
		List<SBMField> customfields = client.getFields(client
				.getTableName(ttitem));
		for (SBMField f : customfields) {
			if (!fieldlist.contains("," + f.getName() + ",")) {
				// do not process custom field when it has not
				// been selected by user in repository settings page
				continue;
			}
			try {
				SBMSystemFields sysfield = SBMSystemFields.valueOf(f.getName());
				if( sysfield.hasTaskAttribute()) {
					// the field has an equivalent in the task attribute
					// mappings and therefore it can be skipped in the custom
					// fields section
					continue;
				}
			} catch (IllegalArgumentException e) {
				//field is not a system field, do nothing
			}
			monitor.subTask("Read custom field [" + f.getName() + "]");
			TaskAttribute custom = data.getRoot().createAttribute(f.getName());
			custom.getMetaData().setType(
					new SBMTicketAttributeMapper(repository).mapToTaskKey(f
							.getType()));
			custom.getMetaData().setLabel(f.getLabel());
			custom.getMetaData().setKind(TaskAttribute.KIND_DEFAULT);
			custom.getMetaData().setReadOnly(true);
			
			//set value/ values depending on field type
			// single selection
			if (f.getType() == SBMFieldTypes.SELECTION
					&& client.getFieldValue(ttitem, f.getName()) != null) {
				//List<SBMFieldValue> options = client.getValidSet(client
				//		.getTableName(ttitem), f.getName());
				//for (SBMFieldValue optionvalue : options) {
				//	custom.putOption(optionvalue.getInternalValue(),
				//			optionvalue.getValue());
				//}
				String val = client.getFieldValue(ttitem, f.getName())
						.getValue();
				custom.setValue(val);
			// Multi-Type fields
			} else if (f.getType() == SBMFieldTypes.MULTIPLE_SELECTION
					|| f.getType() == SBMFieldTypes.MULTIPLE_RELATIONAL
					|| f.getType() == SBMFieldTypes.MULTIPLE_GROUP
					|| f.getType() == SBMFieldTypes.MULTIPLE_USERGROUP) {
				List<SBMFieldValue> values = client.getFieldValues(ttitem, f
						.getName());
				for (SBMFieldValue val : values) {
					custom.putOption(val.getInternalValue(), val.getValue());
					custom.addValue(val.getValue());
				}
			//Date fields
			} else if (f.getType() == SBMFieldTypes.DATETIME) {
				String datestring = client.getFieldValue(ttitem, f.getName()).getValue();
				long timestamp;
				try {
					timestamp = DatatypeFactory.newInstance().newXMLGregorianCalendar(datestring).toGregorianCalendar().getTimeInMillis();
					custom.setValue(String.valueOf(timestamp));
				} catch (DatatypeConfigurationException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IllegalArgumentException e) {
					//date field is probably empty
					custom.setValue("");
				}
				
			// any other field type
			} else if (client.getFieldValue(ttitem, f.getName()) != null) {
				custom.setValue(client.getFieldValue(ttitem, f.getName())
						.getValue());
			}
		}
		monitor.worked(1);

		// ----------
		// Notes
		// ----------
		monitor.subTask("Read notes.");
		for (SBMNote n : client.getNotes(ttitem)) {
			TaskCommentMapper mapper = new TaskCommentMapper();
			mapper.setCommentId(n.getId());
			mapper.setNumber(Integer.valueOf(n.getId()));
			mapper.setText(n.getText());
			mapper.setCreationDate(n.getCreation());

			TaskAttribute a = data.getRoot()
					.createAttribute("NOTE" + n.getId());
			mapper.applyTo(a);
		}
		monitor.worked(1);

		data.setPartial(false);
		return data;
	}
}