/*
 * Copyright 2021 Red Hat, Inc. and/or its affiliates.
 *
 * 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.jbpm.bpmn2.xml;

import java.util.List;

import org.jbpm.bpmn2.core.Interface;
import org.jbpm.bpmn2.core.Interface.Operation;
import org.jbpm.compiler.xml.Parser;
import org.jbpm.compiler.xml.ProcessBuildData;
import org.jbpm.workflow.core.Node;
import org.jbpm.workflow.core.node.WorkItemNode;
import org.w3c.dom.Element;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class ServiceTaskHandler extends TaskHandler {

    @Override
    protected Node createNode(Attributes attrs) {
        return new WorkItemNode();
    }

    @SuppressWarnings("unchecked")
    @Override
    public Class generateNodeFor() {
        return Node.class;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Node handleNode(final Node node, final Element element, final String uri,
            final String localName, final Parser parser) throws SAXException {
        Node currentNode = super.handleNode(node, element, uri, localName, parser);
        WorkItemNode workItemNode = (WorkItemNode) node;
        String operationRef = element.getAttribute("operationRef");
        String implementation = element.getAttribute("implementation");
        List<Interface> interfaces = (List<Interface>) ((ProcessBuildData) parser.getData()).getMetaData("Interfaces");

        workItemNode.setMetaData("OperationRef", operationRef);
        workItemNode.setMetaData("Implementation", implementation);
        workItemNode.setMetaData("Type", "Service Task");

        if (interfaces != null) {
            Operation operation = null;
            for (Interface i : interfaces) {
                operation = i.getOperation(operationRef);
                if (operation != null) {
                    break;
                }
            }
            if (operation == null) {
                throw new ProcessParsingValidationException("Could not find operation " + operationRef);
            }
            // avoid overriding parameters set by data input associations
            if (workItemNode.getWork().getParameter("Interface") == null) {
                String interfaceRef = operation.getInterface().getImplementationRef();
                workItemNode.getWork().setParameter("Interface", interfaceRef != null && !interfaceRef.isEmpty() ? interfaceRef : operation.getInterface().getName());
            }
            if (workItemNode.getWork().getParameter("Operation") == null) {
                workItemNode.getWork().setParameter("Operation", operation.getName());
            }
            if (workItemNode.getWork().getParameter("ParameterType") == null && operation.getMessage() != null) {
                workItemNode.getWork().setParameter("ParameterType", operation.getMessage().getType());
            }
            // parameters to support web service invocation 
            if (implementation != null) {
                workItemNode.getWork().setParameter("interfaceImplementationRef", operation.getInterface().getImplementationRef());
                workItemNode.getWork().setParameter("operationImplementationRef", operation.getImplementationRef());
                workItemNode.getWork().setParameter("implementation", implementation);
            }
        }
        return currentNode;
    }

    @Override
    protected String getTaskName(final Element element) {
        return "Service Task";
    }

    public void writeNode(Node node, StringBuilder xmlDump, boolean includeMeta) {
        throw new IllegalArgumentException("Writing out should be handled by TaskHandler");
    }

}
