/*
 * Copyright 2010 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.ArrayList;
import java.util.List;

import org.jbpm.process.core.context.variable.Variable;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.workflow.core.Node;
import org.jbpm.workflow.core.node.CompositeContextNode;
import org.jbpm.workflow.core.node.CompositeNode;
import org.jbpm.workflow.core.node.EventSubProcessNode;
import org.xml.sax.Attributes;

public class CompositeContextNodeHandler extends AbstractCompositeNodeHandler {

    protected Node createNode(Attributes attrs) {
        throw new IllegalArgumentException("Reading in should be handled by end event handler");
    }

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

    public void writeNode(Node node, StringBuilder xmlDump, int metaDataType) {
        CompositeContextNode compositeNode = (CompositeContextNode) node;
        String nodeType = "subProcess";
        if (node.getMetaData().get("Transaction") != null) {
            nodeType = "transaction";
        }
        writeNode(nodeType, compositeNode, xmlDump, metaDataType);
        if (compositeNode instanceof EventSubProcessNode) {
            xmlDump.append(" triggeredByEvent=\"true\" ");
        }
        Object isForCompensationObject = compositeNode.getMetaData("isForCompensation");
        if (isForCompensationObject != null && ((Boolean) isForCompensationObject)) {
            xmlDump.append("isForCompensation=\"true\" ");
        }
        xmlDump.append(">" + EOL);
        writeExtensionElements(compositeNode, xmlDump);
        // variables
        VariableScope variableScope = (VariableScope) compositeNode.getDefaultContext(VariableScope.VARIABLE_SCOPE);
        if (variableScope != null && !variableScope.getVariables().isEmpty()) {
            xmlDump.append("    <!-- variables -->" + EOL);
            for (Variable variable : variableScope.getVariables()) {
                xmlDump.append("    <property id=\"" + XmlBPMNProcessDumper.replaceIllegalCharsAttribute(variable.getName()) + "\" ");
                if (variable.getType() != null) {
                    xmlDump.append("itemSubjectRef=\"" + XmlBPMNProcessDumper.getUniqueNodeId(compositeNode) + "-" + XmlBPMNProcessDumper.replaceIllegalCharsAttribute(variable.getName()) + "Item\"");
                }
                // TODO: value
                xmlDump.append("/>" + EOL);
            }
        }
        // nodes
        List<Node> subNodes = getSubNodes(compositeNode);
        XmlBPMNProcessDumper.INSTANCE.visitNodes(subNodes, xmlDump, metaDataType);

        // connections
        visitConnectionsAndAssociations(compositeNode, xmlDump, metaDataType);

        endNode(nodeType, xmlDump);
    }

    protected List<Node> getSubNodes(CompositeNode compositeNode) {
        List<Node> subNodes =
                new ArrayList<Node>();
        for (org.kie.api.definition.process.Node subNode : compositeNode.getNodes()) {
            // filter out composite start and end nodes as they can be regenerated
            if ((!(subNode instanceof CompositeNode.CompositeNodeStart)) &&
                    (!(subNode instanceof CompositeNode.CompositeNodeEnd))) {
                subNodes.add((Node) subNode);
            }
        }
        return subNodes;
    }

}
