/**
 * 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.users;

import org.glite.security.voms.admin.event.EventManager;
import org.glite.security.voms.admin.event.user.membership.RoleDismissedEvent;
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.groups.FindGroupOperation;
import org.glite.security.voms.admin.operations.roles.FindRoleOperation;
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.NoSuchRoleException;
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.VOMSRole;
import org.glite.security.voms.admin.persistence.model.VOMSUser;

public class DismissRoleOperation extends BaseVomsOperation {

  VOMSUser user;

  VOMSGroup group;

  VOMSRole role;

  private DismissRoleOperation(Long userId, String roleFqan) {

    user = (VOMSUser) FindUserOperation.instance(userId).execute();

    VOMSContext context = VOMSContext.instance(roleFqan);

    group = context.getGroup();
    role = context.getRole();
  }

  private DismissRoleOperation(VOMSUser u, VOMSGroup g, VOMSRole r) {

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

  public VOMSContext getContext() {

    return VOMSContext.instance(group);
  }

  public VOMSPermission getRequiredPermission() {

    return VOMSPermission.getContainerRWPermissions();
  }

  public Object doExecute() {

    VOMSUserDAO.instance().dismissRole(user, group, role);
    EventManager.instance().dispatch(new RoleDismissedEvent(user, group, role));

    return user;
  }

  public static DismissRoleOperation instance(String groupName,
    String roleName, String userName, String caDn) {

    VOMSUser u = (VOMSUser) FindUserOperation.instance(userName, caDn)
      .execute();
    VOMSGroup g = (VOMSGroup) FindGroupOperation.instance(groupName).execute();
    VOMSRole r = (VOMSRole) FindRoleOperation.instance(roleName).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.");

    if (r == null)
      throw new NoSuchRoleException("Role '" + roleName
        + "' does not exists in this vo.");

    return new DismissRoleOperation(u, g, r);

  }

  public static DismissRoleOperation instance(VOMSUser u, VOMSGroup g,
    VOMSRole r) {

    return new DismissRoleOperation(u, g, r);
  }

  public static DismissRoleOperation instance(Long userId, String roleFqan) {

    return new DismissRoleOperation(userId, roleFqan);
  }

  protected void setupPermissions() {

    addRequiredPermission(VOMSContext.instance(group), VOMSPermission
      .getContainerReadPermission().setMembershipRWPermission());

  }
}