// Copyright (C) 2017 The Android Open Source Project
//
// 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 com.google.gerrit.server.restapi.config;

import com.google.gerrit.extensions.api.config.ConsistencyCheckInfo;
import com.google.gerrit.extensions.api.config.ConsistencyCheckInfo.CheckAccountExternalIdsResultInfo;
import com.google.gerrit.extensions.api.config.ConsistencyCheckInfo.CheckAccountsResultInfo;
import com.google.gerrit.extensions.api.config.ConsistencyCheckInfo.CheckGroupsResultInfo;
import com.google.gerrit.extensions.api.config.ConsistencyCheckInput;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.server.account.AccountsConsistencyChecker;
import com.google.gerrit.server.account.externalids.ExternalIdsConsistencyChecker;
import com.google.gerrit.server.config.ConfigResource;
import com.google.gerrit.server.group.db.GroupsConsistencyChecker;
import com.google.gerrit.server.permissions.GlobalPermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import org.eclipse.jgit.errors.ConfigInvalidException;

@Singleton
public class CheckConsistency implements RestModifyView<ConfigResource, ConsistencyCheckInput> {
  private final PermissionBackend permissionBackend;
  private final AccountsConsistencyChecker accountsConsistencyChecker;
  private final ExternalIdsConsistencyChecker externalIdsConsistencyChecker;
  private final GroupsConsistencyChecker groupsConsistencyChecker;

  @Inject
  CheckConsistency(
      PermissionBackend permissionBackend,
      AccountsConsistencyChecker accountsConsistencyChecker,
      ExternalIdsConsistencyChecker externalIdsConsistencyChecker,
      GroupsConsistencyChecker groupsChecker) {
    this.permissionBackend = permissionBackend;
    this.accountsConsistencyChecker = accountsConsistencyChecker;
    this.externalIdsConsistencyChecker = externalIdsConsistencyChecker;
    this.groupsConsistencyChecker = groupsChecker;
  }

  @Override
  public Response<ConsistencyCheckInfo> apply(ConfigResource resource, ConsistencyCheckInput input)
      throws RestApiException, IOException, PermissionBackendException, ConfigInvalidException {
    permissionBackend.currentUser().check(GlobalPermission.ACCESS_DATABASE);

    if (input == null
        || (input.checkAccounts == null
            && input.checkAccountExternalIds == null
            && input.checkGroups == null)) {
      throw new BadRequestException("input required");
    }

    ConsistencyCheckInfo consistencyCheckInfo = new ConsistencyCheckInfo();
    if (input.checkAccounts != null) {
      consistencyCheckInfo.checkAccountsResult =
          new CheckAccountsResultInfo(accountsConsistencyChecker.check());
    }
    if (input.checkAccountExternalIds != null) {
      consistencyCheckInfo.checkAccountExternalIdsResult =
          new CheckAccountExternalIdsResultInfo(externalIdsConsistencyChecker.check());
    }

    if (input.checkGroups != null) {
      consistencyCheckInfo.checkGroupsResult =
          new CheckGroupsResultInfo(groupsConsistencyChecker.check());
    }

    return Response.ok(consistencyCheckInfo);
  }
}