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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.persistence.entity;

import java.util.List;
import java.util.Map;

import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.EventDefinition;
import org.activiti.bpmn.model.Message;
import org.activiti.bpmn.model.MessageEventDefinition;
import org.activiti.bpmn.model.Signal;
import org.activiti.bpmn.model.SignalEventDefinition;
import org.activiti.bpmn.model.StartEvent;
import org.activiti.bpmn.model.TimerEventDefinition;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.DeploymentQueryImpl;
import org.activiti.engine.impl.ModelQueryImpl;
import org.activiti.engine.impl.Page;
import org.activiti.engine.impl.ProcessDefinitionQueryImpl;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.activiti.engine.impl.jobexecutor.TimerEventHandler;
import org.activiti.engine.impl.jobexecutor.TimerStartEventJobHandler;
import org.activiti.engine.impl.jobexecutor.TimerSuspendProcessDefinitionHandler;
import org.activiti.engine.impl.persistence.entity.data.DataManager;
import org.activiti.engine.impl.persistence.entity.data.DeploymentDataManager;
import org.activiti.engine.impl.util.CollectionUtil;
import org.activiti.engine.impl.util.ProcessDefinitionUtil;
import org.activiti.engine.impl.util.TimerUtil;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.Model;
import org.activiti.engine.repository.ProcessDefinition;

/**


 */
public class DeploymentEntityManagerImpl extends AbstractEntityManager implements DeploymentEntityManager {

  protected DeploymentDataManager deploymentDataManager;
  
  public DeploymentEntityManagerImpl(ProcessEngineConfigurationImpl processEngineConfiguration, DeploymentDataManager deploymentDataManager) {
    super(processEngineConfiguration);
    this.deploymentDataManager = deploymentDataManager;
  }
  
  @Override
  protected DataManager getDataManager() {
    return deploymentDataManager;
  }
  
  @Override
  public void insert(DeploymentEntity deployment) {
    insert(deployment, false);

    for (ResourceEntity resource : deployment.getResources().values()) {
      resource.setDeploymentId(deployment.getId());
      getResourceEntityManager().insert(resource);
    }
  }

  @Override
  public void deleteDeployment(String deploymentId, boolean cascade) {
    List processDefinitions = new ProcessDefinitionQueryImpl().deploymentId(deploymentId).list();
    
    updateRelatedModels(deploymentId);

    if (cascade) {
      deleteProcessInstancesForProcessDefinitions(processDefinitions);
    }

    for (ProcessDefinition processDefinition : processDefinitions) {
      deleteProcessDefinitionIdentityLinks(processDefinition);
      deleteEventSubscriptions(processDefinition);
      deleteProcessDefinitionInfo(processDefinition.getId());
      
      removeTimerStartJobs(processDefinition);
      
      // If previous process definition version has a timer/signal/message start event, it must be added
      // Only if the currently deleted process definition is the latest version, 
      // we fall back to the previous timer/signal/message start event
      
      restorePreviousStartEventsIfNeeded(processDefinition);
    }

    deleteProcessDefinitionForDeployment(deploymentId);
    getResourceEntityManager().deleteResourcesByDeploymentId(deploymentId);
    delete(findById(deploymentId), false);
  }

  protected void updateRelatedModels(String deploymentId) {
    // Remove the deployment link from any model.
    // The model will still exists, as a model is a source for a deployment model and has a different lifecycle
    List models = new ModelQueryImpl().deploymentId(deploymentId).list();
    for (Model model : models) {
      ModelEntity modelEntity = (ModelEntity) model;
      modelEntity.setDeploymentId(null);
      getModelEntityManager().updateModel(modelEntity);
    }
  }

  protected void deleteProcessDefinitionIdentityLinks(ProcessDefinition processDefinition) {
    getIdentityLinkEntityManager().deleteIdentityLinksByProcDef(processDefinition.getId());
  }

  protected void deleteEventSubscriptions(ProcessDefinition processDefinition) {
    EventSubscriptionEntityManager eventSubscriptionEntityManager = getEventSubscriptionEntityManager();
    eventSubscriptionEntityManager.deleteEventSubscriptionsForProcessDefinition(processDefinition.getId());
  }

  protected void deleteProcessDefinitionInfo(String processDefinitionId) {
    getProcessDefinitionInfoEntityManager().deleteProcessDefinitionInfo(processDefinitionId);
  }
  
  protected void deleteProcessDefinitionForDeployment(String deploymentId) {
    getProcessDefinitionEntityManager().deleteProcessDefinitionsByDeploymentId(deploymentId);
  }

  protected void deleteProcessInstancesForProcessDefinitions(List processDefinitions) {
    for (ProcessDefinition processDefinition : processDefinitions) {
      getExecutionEntityManager().deleteProcessInstancesByProcessDefinition(processDefinition.getId(), "deleted deployment", true);
    }
  }

  protected void removeRelatedJobs(ProcessDefinition processDefinition) {
    List timerJobs = getJobEntityManager()
            .findJobsByProcessDefinitionId(processDefinition.getId());
    if (timerJobs != null && timerJobs.size() > 0) {
      for (JobEntity timerJob : timerJobs) {
        if (getEventDispatcher().isEnabled()) {
          getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.JOB_CANCELED, timerJob, null, null, processDefinition.getId()));
        }

        getJobEntityManager().delete(timerJob);
      }
    }
  }

  protected void removeTimerSuspendProcesDefJobs(ProcessDefinition processDefinition) {
    List timerJobs = getJobEntityManager()
        .findJobsByTypeAndProcessDefinitionId(TimerSuspendProcessDefinitionHandler.TYPE, processDefinition.getId());
    if (timerJobs != null && timerJobs.size() > 0) {
      for (JobEntity timerJob : timerJobs) {
        if (getEventDispatcher().isEnabled()) {
          getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.JOB_CANCELED, timerJob, null, null, processDefinition.getId()));
        }

        getJobEntityManager().delete(timerJob);
      }
    }
  }

  protected void removeTimerStartJobs(ProcessDefinition processDefinition) {
    List timerStartJobs = getTimerJobEntityManager()
        .findJobsByTypeAndProcessDefinitionId(TimerStartEventJobHandler.TYPE, processDefinition.getId());
    if (timerStartJobs != null && timerStartJobs.size() > 0) {
      for (TimerJobEntity timerStartJob : timerStartJobs) {
        if (getEventDispatcher().isEnabled()) {
          getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.JOB_CANCELED, timerStartJob, null, null, processDefinition.getId()));
        }

        getTimerJobEntityManager().delete(timerStartJob);
      }
    }
  }
  
  protected void restorePreviousStartEventsIfNeeded(ProcessDefinition processDefinition) {
    ProcessDefinitionEntity latestProcessDefinition = findLatestProcessDefinition(processDefinition);
    if (processDefinition.getId().equals(latestProcessDefinition.getId())) { 
      
      // Try to find a previous version (it could be some versions are missing due to deletions)
      ProcessDefinition previousProcessDefinition = findNewLatestProcessDefinitionAfterRemovalOf(processDefinition);
      if (previousProcessDefinition != null) {

        BpmnModel bpmnModel = ProcessDefinitionUtil.getBpmnModel(previousProcessDefinition.getId());
        org.activiti.bpmn.model.Process previousProcess = ProcessDefinitionUtil.getProcess(previousProcessDefinition.getId());
        if (CollectionUtil.isNotEmpty(previousProcess.getFlowElements())) {
          
          List startEvents = previousProcess.findFlowElementsOfType(StartEvent.class);
          
          if (CollectionUtil.isNotEmpty(startEvents)) {
            for (StartEvent startEvent : startEvents) {
              
              if (CollectionUtil.isNotEmpty(startEvent.getEventDefinitions())) {
                EventDefinition eventDefinition = startEvent.getEventDefinitions().get(0);
                if (eventDefinition instanceof TimerEventDefinition) {
                  restoreTimerStartEvent(previousProcessDefinition, startEvent, eventDefinition);
                } else if (eventDefinition instanceof SignalEventDefinition) {
                  restoreSignalStartEvent(previousProcessDefinition, bpmnModel, startEvent, eventDefinition);
                } else if (eventDefinition instanceof MessageEventDefinition) {
                  restoreMessageStartEvent(previousProcessDefinition, bpmnModel, startEvent, eventDefinition);
                }
                
              }
              
            }
          }

        }

      }
    }
  }

  protected void restoreTimerStartEvent(ProcessDefinition previousProcessDefinition, StartEvent startEvent, EventDefinition eventDefinition) {
    TimerEventDefinition timerEventDefinition = (TimerEventDefinition) eventDefinition;
    TimerJobEntity timer = TimerUtil.createTimerEntityForTimerEventDefinition((TimerEventDefinition) eventDefinition, false, null, TimerStartEventJobHandler.TYPE,
        TimerEventHandler.createConfiguration(startEvent.getId(), timerEventDefinition.getEndDate(), timerEventDefinition.getCalendarName()));
    
    if (timer != null) {
      TimerJobEntity timerJob = getJobManager().createTimerJob((TimerEventDefinition) eventDefinition, false, null, TimerStartEventJobHandler.TYPE,
          TimerEventHandler.createConfiguration(startEvent.getId(), timerEventDefinition.getEndDate(), timerEventDefinition.getCalendarName()));
      
      timerJob.setProcessDefinitionId(previousProcessDefinition.getId());
      
      if (previousProcessDefinition.getTenantId() != null) {
        timerJob.setTenantId(previousProcessDefinition.getTenantId());
      }
      
      getJobManager().scheduleTimerJob(timerJob);
    }
  }

  protected void restoreSignalStartEvent(ProcessDefinition previousProcessDefinition, BpmnModel bpmnModel, StartEvent startEvent, EventDefinition eventDefinition) {
    SignalEventDefinition signalEventDefinition = (SignalEventDefinition) eventDefinition;
    SignalEventSubscriptionEntity subscriptionEntity = getEventSubscriptionEntityManager().createSignalEventSubscription();
    Signal signal = bpmnModel.getSignal(signalEventDefinition.getSignalRef());
    if (signal != null) {
      subscriptionEntity.setEventName(signal.getName());
    } else {
      subscriptionEntity.setEventName(signalEventDefinition.getSignalRef());
    }
    subscriptionEntity.setActivityId(startEvent.getId());
    subscriptionEntity.setProcessDefinitionId(previousProcessDefinition.getId());
    if (previousProcessDefinition.getTenantId() != null) {
      subscriptionEntity.setTenantId(previousProcessDefinition.getTenantId());
    }

    getEventSubscriptionEntityManager().insert(subscriptionEntity);
  }

  protected void restoreMessageStartEvent(ProcessDefinition previousProcessDefinition, BpmnModel bpmnModel, StartEvent startEvent, EventDefinition eventDefinition) {
    MessageEventDefinition messageEventDefinition = (MessageEventDefinition) eventDefinition;
    if (bpmnModel.containsMessageId(messageEventDefinition.getMessageRef())) {
      Message message = bpmnModel.getMessage(messageEventDefinition.getMessageRef());
      messageEventDefinition.setMessageRef(message.getName());
    }

    MessageEventSubscriptionEntity newSubscription = getEventSubscriptionEntityManager().createMessageEventSubscription();
    newSubscription.setEventName(messageEventDefinition.getMessageRef());
    newSubscription.setActivityId(startEvent.getId());
    newSubscription.setConfiguration(previousProcessDefinition.getId());
    newSubscription.setProcessDefinitionId(previousProcessDefinition.getId());

    if (previousProcessDefinition.getTenantId() != null) {
      newSubscription.setTenantId(previousProcessDefinition.getTenantId());
    }

    getEventSubscriptionEntityManager().insert(newSubscription);
  }
  
  protected ProcessDefinitionEntity findLatestProcessDefinition(ProcessDefinition processDefinition) {
    ProcessDefinitionEntity latestProcessDefinition = null;
    if (processDefinition.getTenantId() != null && !ProcessEngineConfiguration.NO_TENANT_ID.equals(processDefinition.getTenantId())) {
      latestProcessDefinition = getProcessDefinitionEntityManager()
          .findLatestProcessDefinitionByKeyAndTenantId(processDefinition.getKey(), processDefinition.getTenantId());
    } else {
      latestProcessDefinition = getProcessDefinitionEntityManager()
          .findLatestProcessDefinitionByKey(processDefinition.getKey());
    }
    return latestProcessDefinition;
  }
  
  protected ProcessDefinition findNewLatestProcessDefinitionAfterRemovalOf(ProcessDefinition processDefinitionToBeRemoved) {
    
    // The latest process definition is not necessarily the one with 'version -1' (some versions could have been deleted)
    // Hence, the following logic
    
    ProcessDefinitionQueryImpl query = new ProcessDefinitionQueryImpl();
    query.processDefinitionKey(processDefinitionToBeRemoved.getKey());
    
    if (processDefinitionToBeRemoved.getTenantId() != null 
        && !ProcessEngineConfiguration.NO_TENANT_ID.equals(processDefinitionToBeRemoved.getTenantId())) {
      query.processDefinitionTenantId(processDefinitionToBeRemoved.getTenantId());
    } else {
      query.processDefinitionWithoutTenantId();
    }
    
    query.processDefinitionVersionLowerThan(processDefinitionToBeRemoved.getVersion());
    query.orderByProcessDefinitionVersion().desc();
    
    List processDefinitions = getProcessDefinitionEntityManager().findProcessDefinitionsByQueryCriteria(query, new Page(0, 1));
    if (processDefinitions != null && processDefinitions.size() > 0) {
      return processDefinitions.get(0);
    } 
    return null;
  }

  @Override
  public DeploymentEntity findLatestDeploymentByName(String deploymentName) {
    return deploymentDataManager.findLatestDeploymentByName(deploymentName);
  }

  @Override
  public long findDeploymentCountByQueryCriteria(DeploymentQueryImpl deploymentQuery) {
    return deploymentDataManager.findDeploymentCountByQueryCriteria(deploymentQuery);
  }

  @Override
  public List findDeploymentsByQueryCriteria(DeploymentQueryImpl deploymentQuery, Page page) {
    return deploymentDataManager.findDeploymentsByQueryCriteria(deploymentQuery, page);
  }

  @Override
  public List getDeploymentResourceNames(String deploymentId) {
    return deploymentDataManager.getDeploymentResourceNames(deploymentId);
  }

  @Override
  public List findDeploymentsByNativeQuery(Map parameterMap, int firstResult, int maxResults) {
    return deploymentDataManager.findDeploymentsByNativeQuery(parameterMap, firstResult, maxResults);
  }

  @Override
  public long findDeploymentCountByNativeQuery(Map parameterMap) {
    return deploymentDataManager.findDeploymentCountByNativeQuery(parameterMap);
  }


  public DeploymentDataManager getDeploymentDataManager() {
    return deploymentDataManager;
  }


  public void setDeploymentDataManager(DeploymentDataManager deploymentDataManager) {
    this.deploymentDataManager = deploymentDataManager;
  }

  @Override
  public Deployment selectLatestDeployment (String deploymentName){
    return deploymentDataManager.selectLatestDeployment(deploymentName);
  }
}