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/*
 * SonarQube
 * Copyright (C) 2009-2018 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.server.organization.ws;

import java.util.Collection;
import java.util.List;
import org.sonar.api.server.ws.Request;
import org.sonar.api.server.ws.Response;
import org.sonar.api.server.ws.WebService;
import org.sonar.core.util.stream.MoreCollectors;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;
import org.sonar.db.component.ComponentDto;
import org.sonar.db.organization.OrganizationDto;
import org.sonar.db.qualitygate.QualityGateDto;
import org.sonar.db.qualityprofile.QProfileDto;
import org.sonar.server.component.ComponentCleanerService;
import org.sonar.server.organization.DefaultOrganization;
import org.sonar.server.organization.DefaultOrganizationProvider;
import org.sonar.server.organization.OrganizationFlags;
import org.sonar.server.qualityprofile.QProfileFactory;
import org.sonar.server.user.UserSession;
import org.sonar.server.user.index.UserIndexer;

import static com.google.common.base.Preconditions.checkArgument;
import static org.sonar.db.permission.OrganizationPermission.ADMINISTER;
import static org.sonar.server.organization.ws.OrganizationsWsSupport.PARAM_KEY;
import static org.sonar.server.organization.ws.OrganizationsWsSupport.PARAM_ORGANIZATION;
import static org.sonar.server.ws.KeyExamples.KEY_ORG_EXAMPLE_002;
import static org.sonar.server.ws.WsUtils.checkFoundWithOptional;

public class DeleteAction implements OrganizationsWsAction {
  private static final String ACTION = "delete";

  private final UserSession userSession;
  private final DbClient dbClient;
  private final DefaultOrganizationProvider defaultOrganizationProvider;
  private final ComponentCleanerService componentCleanerService;
  private final OrganizationFlags organizationFlags;
  private final UserIndexer userIndexer;
  private final QProfileFactory qProfileFactory;

  public DeleteAction(UserSession userSession, DbClient dbClient, DefaultOrganizationProvider defaultOrganizationProvider,
    ComponentCleanerService componentCleanerService, OrganizationFlags organizationFlags, UserIndexer userIndexer, QProfileFactory qProfileFactory) {
    this.userSession = userSession;
    this.dbClient = dbClient;
    this.defaultOrganizationProvider = defaultOrganizationProvider;
    this.componentCleanerService = componentCleanerService;
    this.organizationFlags = organizationFlags;
    this.userIndexer = userIndexer;
    this.qProfileFactory = qProfileFactory;
  }

  @Override
  public void define(WebService.NewController context) {
    WebService.NewAction action = context.createAction(ACTION)
      .setPost(true)
      .setDescription("Delete an organization.
" +
        "Require 'Administer System' permission on the specified organization. Organization support must be enabled.")
      .setInternal(true)
      .setSince("6.2")
      .setHandler(this);

    action.createParam(PARAM_ORGANIZATION)
      .setRequired(true)
      .setDescription("Organization key")
      .setDeprecatedKey(PARAM_KEY, "6.4")
      .setExampleValue(KEY_ORG_EXAMPLE_002);
  }

  @Override
  public void handle(Request request, Response response) throws Exception {
    userSession.checkLoggedIn();

    try (DbSession dbSession = dbClient.openSession(false)) {
      organizationFlags.checkEnabled(dbSession);

      String key = request.mandatoryParam(PARAM_ORGANIZATION);
      preventDeletionOfDefaultOrganization(key, defaultOrganizationProvider.get());

      OrganizationDto organization = checkFoundWithOptional(dbClient.organizationDao().selectByKey(dbSession, key), "Organization with key '%s' not found", key);
      if (organization.isGuarded()) {
        userSession.checkIsSystemAdministrator();
      } else {
        userSession.checkPermission(ADMINISTER, organization);
      }

      deleteProjects(dbSession, organization);
      deletePermissions(dbSession, organization);
      deleteGroups(dbSession, organization);
      deleteQualityProfiles(dbSession, organization);
      deleteQualityGates(dbSession, organization);
      deleteOrganization(dbSession, organization);

      response.noContent();
    }
  }

  private void deleteProjects(DbSession dbSession, OrganizationDto organization) {
    List roots = dbClient.componentDao().selectAllRootsByOrganization(dbSession, organization.getUuid());
    componentCleanerService.delete(dbSession, roots);
  }

  private void deletePermissions(DbSession dbSession, OrganizationDto organization) {
    dbClient.permissionTemplateDao().deleteByOrganization(dbSession, organization.getUuid());
    dbSession.commit();
    dbClient.userPermissionDao().deleteByOrganization(dbSession, organization.getUuid());
    dbSession.commit();
    dbClient.groupPermissionDao().deleteByOrganization(dbSession, organization.getUuid());
    dbSession.commit();
  }

  private void deleteGroups(DbSession dbSession, OrganizationDto organization) {
    dbClient.groupDao().deleteByOrganization(dbSession, organization.getUuid());
    dbSession.commit();
  }

  private void deleteQualityProfiles(DbSession dbSession, OrganizationDto organization) {
    List profiles = dbClient.qualityProfileDao().selectOrderedByOrganizationUuid(dbSession, organization);
    qProfileFactory.delete(dbSession, profiles);
  }

  private void deleteQualityGates(DbSession dbSession, OrganizationDto organization) {
    Collection qualityGates = dbClient.qualityGateDao().selectAll(dbSession, organization);
    dbClient.qualityGateDao().deleteByUuids(dbSession, qualityGates.stream()
      .filter(q -> !q.isBuiltIn())
      .map(QualityGateDto::getUuid)
      .collect(MoreCollectors.toList()));
    dbClient.qualityGateDao().deleteOrgQualityGatesByOrganization(dbSession, organization);
  }

  private void deleteOrganization(DbSession dbSession, OrganizationDto organization) {
    Collection logins = dbClient.organizationMemberDao().selectLoginsByOrganizationUuid(dbSession, organization.getUuid());
    dbClient.organizationMemberDao().deleteByOrganizationUuid(dbSession, organization.getUuid());
    dbClient.organizationDao().deleteByUuid(dbSession, organization.getUuid());
    dbClient.userDao().cleanHomepage(dbSession, organization);
    userIndexer.commitAndIndexByLogins(dbSession, logins);
  }

  private static void preventDeletionOfDefaultOrganization(String key, DefaultOrganization defaultOrganization) {
    checkArgument(!defaultOrganization.getKey().equals(key), "Default Organization can't be deleted");
  }
}