/*
 * 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.workflow.instance.node;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.jbpm.process.core.Context;
import org.jbpm.process.core.ContextContainer;
import org.jbpm.process.instance.ContextInstance;
import org.jbpm.process.instance.ContextInstanceContainer;
import org.jbpm.process.instance.ContextableInstance;
import org.jbpm.process.instance.ProcessInstance;
import org.jbpm.process.instance.impl.ContextInstanceFactory;
import org.jbpm.process.instance.impl.ContextInstanceFactoryRegistry;
import org.jbpm.workflow.core.node.CompositeContextNode;

public class CompositeContextNodeInstance extends CompositeNodeInstance implements ContextInstanceContainer, ContextableInstance {

    private static final long serialVersionUID = 510l;

    private Map<String, ContextInstance> contextInstances = new HashMap<String, ContextInstance>();
    private Map<String, List<ContextInstance>> subContextInstances = new HashMap<String, List<ContextInstance>>();

    protected CompositeContextNode getCompositeContextNode() {
        return (CompositeContextNode) getNode();
    }

    public ContextContainer getContextContainer() {
        return getCompositeContextNode();
    }

    public void setContextInstance(String contextId, ContextInstance contextInstance) {
        this.contextInstances.put(contextId, contextInstance);
    }

    public ContextInstance getContextInstance(String contextId) {
        ContextInstance contextInstance = this.contextInstances.get(contextId);
        if (contextInstance != null) {
            return contextInstance;
        }
        Context context = getCompositeContextNode().getDefaultContext(contextId);
        if (context != null) {
            contextInstance = getContextInstance(context);
            return contextInstance;
        }
        return null;
    }

    public List<ContextInstance> getContextInstances(String contextId) {
        return this.subContextInstances.get(contextId);
    }

    public void addContextInstance(String contextId, ContextInstance contextInstance) {
        List<ContextInstance> list = this.subContextInstances.get(contextId);
        if (list == null) {
            list = new ArrayList<ContextInstance>();
            this.subContextInstances.put(contextId, list);
        }
        list.add(contextInstance);
    }

    public void removeContextInstance(String contextId, ContextInstance contextInstance) {
        List<ContextInstance> list = this.subContextInstances.get(contextId);
        if (list != null) {
            list.remove(contextInstance);
        }
    }

    public ContextInstance getContextInstance(String contextId, long id) {
        List<ContextInstance> contextInstances = subContextInstances.get(contextId);
        if (contextInstances != null) {
            for (ContextInstance contextInstance : contextInstances) {
                if (contextInstance.getContextId() == id) {
                    return contextInstance;
                }
            }
        }
        return null;
    }

    public ContextInstance getContextInstance(final Context context) {
        ContextInstanceFactory conf = ContextInstanceFactoryRegistry.INSTANCE.getContextInstanceFactory(context);
        if (conf == null) {
            throw new IllegalArgumentException("Illegal context type (registry not found): " + context.getClass());
        }
        ContextInstance contextInstance = (ContextInstance) conf.getContextInstance(context, this, (ProcessInstance) getProcessInstance());
        if (contextInstance == null) {
            throw new IllegalArgumentException("Illegal context type (instance not found): " + context.getClass());
        }
        return contextInstance;
    }

}
