/* 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.rest.service.api.identity;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.identity.Group;
import org.activiti.rest.exception.ActivitiConflictException;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Frederik Heremans
 */
@RestController
public class GroupMembershipCollectionResource extends BaseGroupResource {

  @RequestMapping(value="/identity/groups/{groupId}/members", method = RequestMethod.POST, produces = "application/json")
  public MembershipResponse createMembership(@PathVariable String groupId, @RequestBody MembershipRequest memberShip,
      HttpServletRequest request, HttpServletResponse response) {
    
    Group group = getGroupFromRequest(groupId);
   
    if(memberShip.getUserId() == null) {
      throw new ActivitiIllegalArgumentException("UserId cannot be null.");
    }
   
    // Check if user is member of group since API doesn't return typed exception
    if (identityService.createUserQuery()
        .memberOfGroup(group.getId())
        .userId(memberShip.getUserId())
        .count() > 0) {
     
        throw new ActivitiConflictException("User '" + memberShip.getUserId() + 
             "' is already part of group '" + group.getId() + "'.");
    }
   
    identityService.createMembership(memberShip.getUserId(), group.getId());
    response.setStatus(HttpStatus.CREATED.value());
     
    return restResponseFactory.createMembershipResponse(memberShip.getUserId(), group.getId());
  }
}