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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 org.activiti.engine.ActivitiException;
import org.activiti.engine.api.internal.Internal;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.activiti.engine.impl.persistence.entity.data.AttachmentDataManager;
import org.activiti.engine.impl.persistence.entity.data.DataManager;
import org.activiti.engine.task.Attachment;
import org.activiti.engine.task.Task;

import java.util.List;

/**


 */
@Internal
@Deprecated
public class AttachmentEntityManagerImpl extends AbstractEntityManager implements AttachmentEntityManager {

  protected AttachmentDataManager attachmentDataManager;
  
  public AttachmentEntityManagerImpl(ProcessEngineConfigurationImpl processEngineConfiguration, AttachmentDataManager attachmentDataManager) {
    super(processEngineConfiguration);
    this.attachmentDataManager = attachmentDataManager;
  }
  
  @Override
  protected DataManager getDataManager() {
    return attachmentDataManager;
  }
  
  @Override
  public List findAttachmentsByProcessInstanceId(String processInstanceId) {
    checkHistoryEnabled();
    return attachmentDataManager.findAttachmentsByProcessInstanceId(processInstanceId);
  }

  @Override
  public List findAttachmentsByTaskId(String taskId) {
    checkHistoryEnabled();
    return attachmentDataManager.findAttachmentsByTaskId(taskId);
  }

  @Override
  public void deleteAttachmentsByTaskId(String taskId) {
    checkHistoryEnabled();
    List attachments = findAttachmentsByTaskId(taskId);
    boolean dispatchEvents = getEventDispatcher().isEnabled();

    String processInstanceId = null;
    String processDefinitionId = null;
    String executionId = null;

    if (dispatchEvents && attachments != null && !attachments.isEmpty()) {
      // Forced to fetch the task to get hold of the process definition
      // for event-dispatching, if available
      Task task = getTaskEntityManager().findById(taskId);
      if (task != null) {
        processDefinitionId = task.getProcessDefinitionId();
        processInstanceId = task.getProcessInstanceId();
        executionId = task.getExecutionId();
      }
    }

    for (Attachment attachment : attachments) {
      String contentId = attachment.getContentId();
      if (contentId != null) {
        getByteArrayEntityManager().deleteByteArrayById(contentId);
      }
      
      attachmentDataManager.delete((AttachmentEntity) attachment);
      
      if (dispatchEvents) {
        getEventDispatcher().dispatchEvent(
            ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_DELETED, attachment, executionId, processInstanceId, processDefinitionId));
      }
    }
  }

  protected void checkHistoryEnabled() {
    if (!getHistoryManager().isHistoryEnabled()) {
      throw new ActivitiException("In order to use attachments, history should be enabled");
    }
  }

  public AttachmentDataManager getAttachmentDataManager() {
    return attachmentDataManager;
  }

  public void setAttachmentDataManager(AttachmentDataManager attachmentDataManager) {
    this.attachmentDataManager = attachmentDataManager;
  }
  
}