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/* 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.
 */
package org.flowable.bpmn.converter.child;

import javax.xml.stream.XMLStreamReader;

import org.apache.commons.lang3.StringUtils;
import org.flowable.bpmn.converter.util.BpmnXMLUtil;
import org.flowable.bpmn.model.BaseElement;
import org.flowable.bpmn.model.BpmnModel;
import org.flowable.bpmn.model.Event;
import org.flowable.bpmn.model.MessageEventDefinition;

/**
 * @author Tijs Rademakers
 */
public class MessageEventDefinitionParser extends BaseChildElementParser {

    @Override
    public String getElementName() {
        return ELEMENT_EVENT_MESSAGEDEFINITION;
    }

    @Override
    public void parseChildElement(XMLStreamReader xtr, BaseElement parentElement, BpmnModel model) throws Exception {
        if (!(parentElement instanceof Event))
            return;

        MessageEventDefinition eventDefinition = new MessageEventDefinition();
        BpmnXMLUtil.addXMLLocation(eventDefinition, xtr);
        eventDefinition.setMessageRef(xtr.getAttributeValue(null, ATTRIBUTE_MESSAGE_REF));
        eventDefinition.setMessageExpression(BpmnXMLUtil.getAttributeValue(ATTRIBUTE_MESSAGE_EXPRESSION, xtr));

        if (!StringUtils.isEmpty(eventDefinition.getMessageRef())) {

            int indexOfP = eventDefinition.getMessageRef().indexOf(':');
            if (indexOfP != -1) {
                String prefix = eventDefinition.getMessageRef().substring(0, indexOfP);
                String resolvedNamespace = model.getNamespace(prefix);
                String messageRef = eventDefinition.getMessageRef().substring(indexOfP + 1);

                if (resolvedNamespace == null) {
                    // if it's an invalid prefix will consider this is not a namespace prefix so will be used as part of the stringReference
                    messageRef = prefix + ":" + messageRef;
                } else if (!resolvedNamespace.equalsIgnoreCase(model.getTargetNamespace())) {
                    // if it's a valid namespace prefix but it's not the targetNamespace then we'll use it as a valid namespace
                    // (even out editor does not support defining namespaces it is still a valid xml file)
                    messageRef = resolvedNamespace + ":" + messageRef;
                }
                eventDefinition.setMessageRef(messageRef);
            } else {
                eventDefinition.setMessageRef(eventDefinition.getMessageRef());
            }
        }

        BpmnXMLUtil.parseChildElements(ELEMENT_EVENT_MESSAGEDEFINITION, eventDefinition, xtr, model);

        ((Event) parentElement).getEventDefinitions().add(eventDefinition);
    }
}