/* 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.camunda.bpm.engine.impl.cmd;

import java.io.InputStream;

import org.camunda.bpm.engine.history.UserOperationLogEntry;
import org.camunda.bpm.engine.impl.ProcessInstanceQueryImpl;
import org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager;
import org.camunda.bpm.engine.impl.interceptor.Command;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.AttachmentEntity;
import org.camunda.bpm.engine.impl.persistence.entity.ByteArrayEntity;
import org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity;
import org.camunda.bpm.engine.impl.persistence.entity.PropertyChange;
import org.camunda.bpm.engine.impl.persistence.entity.TaskEntity;
import org.camunda.bpm.engine.impl.util.IoUtil;
import org.camunda.bpm.engine.runtime.Execution;
import org.camunda.bpm.engine.runtime.ProcessInstance;
import org.camunda.bpm.engine.runtime.ProcessInstanceQuery;
import org.camunda.bpm.engine.task.Attachment;

import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNotNull;


/**
 * @author Tom Baeyens
 */
// Not Serializable
public class CreateAttachmentCmd implements Command<Attachment> {

  protected String taskId;
  protected String attachmentType;
  protected String processInstanceId;
  protected String attachmentName;
  protected String attachmentDescription;
  protected InputStream content;
  protected String url;
  private TaskEntity task;
  protected ExecutionEntity processInstance;

  public CreateAttachmentCmd(String attachmentType, String taskId, String processInstanceId, String attachmentName, String attachmentDescription, InputStream content, String url) {
    this.attachmentType = attachmentType;
    this.taskId = taskId;
    this.processInstanceId = processInstanceId;
    this.attachmentName = attachmentName;
    this.attachmentDescription = attachmentDescription;
    this.content = content;
    this.url = url;
  }

  @Override
  public Attachment execute(CommandContext commandContext) {
    if (taskId != null) {
      task = commandContext
          .getTaskManager()
          .findTaskById(taskId);
    } else {
      ensureNotNull("taskId or processInstanceId has to be provided", this.processInstanceId);
      processInstance = (ExecutionEntity) commandContext.getExecutionManager().findExecutionsByProcessInstanceId(processInstanceId);
    }

    AttachmentEntity attachment = new AttachmentEntity();
    attachment.setName(attachmentName);
    attachment.setDescription(attachmentDescription);
    attachment.setType(attachmentType);
    attachment.setTaskId(taskId);
    attachment.setProcessInstanceId(processInstanceId);
    attachment.setUrl(url);

    DbEntityManager dbEntityManger = commandContext.getDbEntityManager();
    dbEntityManger.insert(attachment);

    if (content != null) {
      byte[] bytes = IoUtil.readInputStream(content, attachmentName);
      ByteArrayEntity byteArray = new ByteArrayEntity(bytes);
      dbEntityManger.insert(byteArray);
      attachment.setContentId(byteArray.getId());
    }

    PropertyChange propertyChange = new PropertyChange("name", null, attachmentName);

    if (task != null) {
      commandContext.getOperationLogManager()
          .logAttachmentOperation(UserOperationLogEntry.OPERATION_TYPE_ADD_ATTACHMENT, task, propertyChange);
    } else if (processInstance != null) {
      commandContext.getOperationLogManager()
          .logAttachmentOperation(UserOperationLogEntry.OPERATION_TYPE_ADD_ATTACHMENT, processInstance, propertyChange);
    }

    return attachment;
  }

}

@@ -623,16 +623,39 @@
 tStream;
+%0Aimport java.util.List;
 %0A%0Aimport
@@ -1641,16 +1641,98 @@
 otNull;%0A
+import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNumberOfElements;%0A
 %0A%0A/**%0A *
@@ -2904,43 +2904,61 @@
     
-processInstance = (ExecutionEntity)
+List%3CExecutionEntity%3E executionsByProcessInstanceId =
  com
@@ -3041,24 +3041,168 @@
 nstanceId);%0A
+      ensureNumberOfElements(%22processInstances%22,executionsByProcessInstanceId,1);%0A      processInstance = executionsByProcessInstanceId.get(0);%0A
     %7D%0A%0A    A

add ensure on execution selection