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/*
 * Copyright (C) 2020 Dremio
 *
 * 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.projectnessie.services.impl;

import static com.google.common.base.Preconditions.checkArgument;

import java.util.List;
import java.util.Set;
import org.projectnessie.error.NessieConflictException;
import org.projectnessie.error.NessieReferenceConflictException;
import org.projectnessie.model.ImmutableNessieConfiguration;
import org.projectnessie.model.NessieConfiguration;
import org.projectnessie.model.RepositoryConfig;
import org.projectnessie.model.types.GenericRepositoryConfig;
import org.projectnessie.services.authz.AccessContext;
import org.projectnessie.services.authz.Authorizer;
import org.projectnessie.services.authz.BatchAccessChecker;
import org.projectnessie.services.config.ServerConfig;
import org.projectnessie.services.spi.ConfigService;
import org.projectnessie.versioned.ReferenceConflictException;
import org.projectnessie.versioned.RepositoryInformation;
import org.projectnessie.versioned.VersionStore;

public class ConfigApiImpl extends BaseApiImpl implements ConfigService {

  private final int actualApiVersion;

  public ConfigApiImpl(
      ServerConfig config,
      VersionStore store,
      Authorizer authorizer,
      AccessContext accessContext,
      int actualApiVersion) {
    super(config, store, authorizer, accessContext);
    this.actualApiVersion = actualApiVersion;
  }

  @Override
  public NessieConfiguration getConfig() {
    RepositoryInformation info = getStore().getRepositoryInformation();
    String defaultBranch = info.getDefaultBranch();
    if (defaultBranch == null) {
      defaultBranch = getServerConfig().getDefaultBranch();
    }
    return ImmutableNessieConfiguration.builder()
        .from(NessieConfiguration.getBuiltInConfig())
        .defaultBranch(defaultBranch)
        .actualApiVersion(actualApiVersion)
        .noAncestorHash(info.getNoAncestorHash())
        .repositoryCreationTimestamp(info.getRepositoryCreationTimestamp())
        .oldestPossibleCommitTimestamp(info.getOldestPossibleCommitTimestamp())
        .additionalProperties(info.getAdditionalProperties())
        .build();
  }

  @Override
  public List getRepositoryConfig(
      Set repositoryConfigTypes) {
    BatchAccessChecker check = startAccessCheck();
    repositoryConfigTypes.forEach(check::canReadRepositoryConfig);
    check.checkAndThrow();

    return getStore().getRepositoryConfig(repositoryConfigTypes);
  }

  @Override
  public RepositoryConfig updateRepositoryConfig(RepositoryConfig repositoryConfig)
      throws NessieConflictException {
    checkArgument(
        !(repositoryConfig instanceof GenericRepositoryConfig),
        "Repository config type bundle for '%s' is not available on the Nessie server side.",
        repositoryConfig.getType().name());

    startAccessCheck().canUpdateRepositoryConfig(repositoryConfig.getType()).checkAndThrow();

    try {
      return getStore().updateRepositoryConfig(repositoryConfig);
    } catch (ReferenceConflictException e) {
      throw new NessieReferenceConflictException(e.getReferenceConflicts(), e.getMessage(), e);
    }
  }
}