/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare (INFN). 2006-2016
 *
 * 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.glite.security.voms.admin.operations.groups;

import org.glite.security.voms.admin.event.EventManager;
import org.glite.security.voms.admin.event.user.membership.UserAddedToGroupEvent;
import org.glite.security.voms.admin.operations.BaseVomsOperation;
import org.glite.security.voms.admin.operations.VOMSContext;
import org.glite.security.voms.admin.operations.VOMSPermission;
import org.glite.security.voms.admin.operations.users.FindUserOperation;
import org.glite.security.voms.admin.persistence.dao.VOMSUserDAO;
import org.glite.security.voms.admin.persistence.error.NoSuchGroupException;
import org.glite.security.voms.admin.persistence.error.NoSuchUserException;
import org.glite.security.voms.admin.persistence.model.VOMSGroup;
import org.glite.security.voms.admin.persistence.model.VOMSUser;

public class AddMemberOperation extends BaseVomsOperation {

  VOMSUser user;

  VOMSGroup group;

  public AddMemberOperation(VOMSUser u, VOMSGroup g) {

    this.user = u;
    this.group = g;
  }

  public Object doExecute() {

    // Add user to parent groups (if any) if she's not already there
    if (!group.isRootGroup()) {

      if (!user.isMember(group.getParent())) {
        instance(user, group.getParent()).execute();
      }
    }

    VOMSUserDAO.instance().addToGroup(user, group);
    EventManager.instance().dispatch(new UserAddedToGroupEvent(user, group));
    return user;
  }

  public static AddMemberOperation instance(VOMSUser u, VOMSGroup g) {

    return new AddMemberOperation(u, g);
  }

  public static AddMemberOperation instance(String groupName, String username,
    String caDn) {

    VOMSUser u = (VOMSUser) FindUserOperation.instance(username, caDn)
      .execute();
    VOMSGroup g = (VOMSGroup) FindGroupOperation.instance(groupName).execute();

    if (u == null)
      throw new NoSuchUserException("User '" + username + "," + caDn
        + "' not found in this vo.");

    if (g == null)
      throw new NoSuchGroupException("Group '" + groupName
        + "' does not exist in this vo.");
    return new AddMemberOperation(u, g);

  }

  protected void setupPermissions() {

    addRequiredPermission(VOMSContext.instance(group.getParent()),
      VOMSPermission.getContainerReadPermission());
    addRequiredPermission(VOMSContext.instance(group),
      VOMSPermission.getMembershipRWPermissions());

  }
}