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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.engine.impl.jobexecutor;

import java.util.ArrayList;
import java.util.List;

import org.activiti.bpmn.model.BoundaryEvent;
import org.activiti.bpmn.model.CallActivity;
import org.activiti.bpmn.model.FlowElement;
import org.activiti.bpmn.model.FlowNode;
import org.activiti.bpmn.model.SubProcess;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.JobEntity;

/**
 * @author Joram Barrez
 */
public class TriggerTimerEventJobHandler implements JobHandler {

  public static final String TYPE = "trigger-timer";

  public String getType() {
    return TYPE;
  }

  public void execute(JobEntity job, String configuration, ExecutionEntity execution, CommandContext commandContext) {

    commandContext.getAgenda().planTriggerExecutionOperation(execution);

    if (commandContext.getEventDispatcher().isEnabled()) {
      commandContext.getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.TIMER_FIRED, job));
    }
    
    if (execution.getCurrentFlowElement() instanceof BoundaryEvent) {
      List processedElements = new ArrayList();
      dispatchExecutionTimeOut(job, execution, processedElements, commandContext);
    }
  }
  
  protected void dispatchExecutionTimeOut(JobEntity timerEntity, ExecutionEntity execution, List processedElements, CommandContext commandContext) {
    FlowElement currentElement = execution.getCurrentFlowElement();
    if (currentElement instanceof BoundaryEvent) {
      BoundaryEvent boundaryEvent = (BoundaryEvent) execution.getCurrentFlowElement();
      if (boundaryEvent.isCancelActivity() && boundaryEvent.getAttachedToRef() != null) {

        if (processedElements.contains(boundaryEvent.getId()) == false) {
          processedElements.add(boundaryEvent.getId());
          ExecutionEntity parentExecution = execution.getParent();
          dispatchExecutionTimeOut(timerEntity, parentExecution, processedElements, commandContext);
        }
      }
    
    } else {
      
      // flow nodes
      if (execution.getCurrentFlowElement() instanceof FlowNode) {
        processedElements.add(execution.getCurrentActivityId());
        dispatchActivityTimeOut(timerEntity, (FlowNode) execution.getCurrentFlowElement(), execution, commandContext);
      }
      
      // subprocesses
      if (execution.getCurrentFlowElement() instanceof SubProcess) {
        for (ExecutionEntity subExecution : execution.getExecutions()) {
          if (processedElements.contains(subExecution.getCurrentActivityId()) == false) {
            dispatchExecutionTimeOut(timerEntity, subExecution, processedElements, commandContext);
          }
        }
        
      // call activities  
      } else if (execution.getCurrentFlowElement() instanceof CallActivity) {
        ExecutionEntity subProcessInstance = commandContext.getExecutionEntityManager().findSubProcessInstanceBySuperExecutionId(execution.getId());
        if (subProcessInstance != null) {
          List childExecutions = subProcessInstance.getExecutions();
          for (ExecutionEntity subExecution : childExecutions) {
            if (processedElements.contains(subExecution.getCurrentActivityId()) == false) {
              dispatchExecutionTimeOut(timerEntity, subExecution, processedElements, commandContext);
            }
          }
        }
      }
    }
  }

  protected void dispatchActivityTimeOut(JobEntity timerEntity, FlowNode flowNode, ExecutionEntity execution, CommandContext commandContext) {
    commandContext.getEventDispatcher().dispatchEvent(
        ActivitiEventBuilder.createActivityCancelledEvent(flowNode.getId(), flowNode.getName(), execution.getId(), execution.getProcessInstanceId(),
            execution.getProcessDefinitionId(), parseActivityType(flowNode), flowNode.getBehavior().getClass().getCanonicalName(), timerEntity));
  }
  
  protected String parseActivityType(FlowNode flowNode) {
    String elementType = flowNode.getClass().getSimpleName();
    elementType = elementType.substring(0, 1).toLowerCase() + elementType.substring(1);
    return elementType;
  }
}