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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.cmd;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;

import java.io.Serializable;

/**


 */
public class DeleteIdentityLinkForProcessInstanceCmd implements Command, Serializable {

  private static final long serialVersionUID = 1L;

  protected String processInstanceId;

  protected String userId;

  protected String groupId;

  protected String type;

  public DeleteIdentityLinkForProcessInstanceCmd(String processInstanceId, String userId, String groupId, String type) {
    validateParams(userId, groupId, processInstanceId, type);
    this.processInstanceId = processInstanceId;
    this.userId = userId;
    this.groupId = groupId;
    this.type = type;
  }

  protected void validateParams(String userId, String groupId, String processInstanceId, String type) {
    if (processInstanceId == null) {
      throw new ActivitiIllegalArgumentException("processInstanceId is null");
    }

    if (type == null) {
      throw new ActivitiIllegalArgumentException("type is required when deleting a process identity link");
    }

    if (userId == null && groupId == null) {
      throw new ActivitiIllegalArgumentException("userId and groupId cannot both be null");
    }
  }

  public Void execute(CommandContext commandContext) {
    ExecutionEntity processInstance = commandContext.getExecutionEntityManager().findById(processInstanceId);

    if (processInstance == null) {
      throw new ActivitiObjectNotFoundException("Cannot find process instance with id " + processInstanceId, ExecutionEntity.class);
    }
    
    commandContext.getIdentityLinkEntityManager().deleteIdentityLink(processInstance, userId, groupId, type);
    commandContext.getHistoryManager().createProcessInstanceIdentityLinkComment(processInstanceId, userId, groupId, type, false);

    return null;
  }

}