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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.activiti.springboot.integration;

import org.activiti.engine.ProcessEngine;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;

/**
 * Spring Integration Java Configuration DSL integration for Activiti.
 *

 */
public class Activiti {

    /**
     * This is the component that you'll use in your Spring Integration
     * {@link org.springframework.integration.dsl.IntegrationFlow}.
     */
    public static ActivitiInboundGateway inboundGateway(ProcessEngine processEngine, String... varsToPreserve) {
        return new ActivitiInboundGateway(processEngine, varsToPreserve);
    }

    /**
     * This is the bean to expose and then reference
     * from your Activiti BPMN flow in an expression.
     */
    public static IntegrationActivityBehavior inboundGatewayActivityBehavior(ActivitiInboundGateway gateway) {
        return new IntegrationActivityBehavior(gateway);
    }

    /**
     * Any message that enters this {@link MessageHandler}
     * containing a {@code executionId} parameter will trigger a
     * {@link org.activiti.engine.RuntimeService#signalEventReceived(String)}.
     */
    public static MessageHandler signallingMessageHandler(final ProcessEngine processEngine) {
        return new MessageHandler() {
            @Override
            public void handleMessage(Message message) throws MessagingException {
                String executionId = message.getHeaders().containsKey("executionId") ?
                        (String) message.getHeaders().get("executionId") : (String) null;

                if (null != executionId)
                    processEngine.getRuntimeService().trigger(executionId);
            }
        };
    }
}