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package org.activiti.engine.impl.agenda;

import org.activiti.bpmn.model.FlowNode;
import org.activiti.bpmn.model.Process;
import org.activiti.engine.impl.delegate.InactiveActivityBehavior;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.util.ProcessDefinitionUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collection;

/**
 * Operation that usually gets scheduled as last operation of handling a {@link Command}.
 *
 * Executes 'background' behaviours of executions that currently are in an activity that implements
 * the {@link InactiveActivityBehavior} interface.
 *

 */
public class ExecuteInactiveBehaviorsOperation extends AbstractOperation {

  private static final Logger logger = LoggerFactory.getLogger(ExecuteInactiveBehaviorsOperation.class);

  protected Collection involvedExecutions;

  public ExecuteInactiveBehaviorsOperation(CommandContext commandContext) {
    super(commandContext, null);
    this.involvedExecutions = commandContext.getInvolvedExecutions();
  }

  @Override
  public void run() {

    /*
     * Algorithm: for each execution that is involved in this command context,
     *
     * 1) Get its process definition
     * 2) Verify if its process definitions has any InactiveActivityBehavior behaviours.
     * 3) If so, verify if there are any executions inactive in those activities
     * 4) Execute the inactivated behavior
     *
     */

    for (ExecutionEntity executionEntity : involvedExecutions) {

      Process process = ProcessDefinitionUtil.getProcess(executionEntity.getProcessDefinitionId());
      Collection flowNodeIdsWithInactivatedBehavior = new ArrayList();
      for (FlowNode flowNode : process.findFlowElementsOfType(FlowNode.class)) {
        if (flowNode.getBehavior() instanceof InactiveActivityBehavior) {
          flowNodeIdsWithInactivatedBehavior.add(flowNode.getId());
        }
      }

      if (flowNodeIdsWithInactivatedBehavior.size() > 0) {
        Collection inactiveExecutions = commandContext.getExecutionEntityManager().findInactiveExecutionsByProcessInstanceId(executionEntity.getProcessInstanceId());
        for (ExecutionEntity inactiveExecution : inactiveExecutions) {
          if (!inactiveExecution.isActive()
              && flowNodeIdsWithInactivatedBehavior.contains(inactiveExecution.getActivityId())
              && !inactiveExecution.isDeleted()) {

            FlowNode flowNode = (FlowNode) process.getFlowElement(inactiveExecution.getActivityId(), true);
            InactiveActivityBehavior inactiveActivityBehavior = ((InactiveActivityBehavior) flowNode.getBehavior());
            logger.debug("Found InactiveActivityBehavior instance of class {} that can be executed on activity '{}'", inactiveActivityBehavior.getClass(), flowNode.getId());
            inactiveActivityBehavior.executeInactive(inactiveExecution);
          }
        }
      }

    }
  }

}