/*
    * Copyright 2017 LINE Corporation
    *
    * LINE Corporation licenses this file to you 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:
    *
    *   https://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.linecorp.centraldogma.server.internal.api;
  
  import static java.util.Objects.requireNonNull;
  
  import java.util.Map;
  
  import javax.annotation.Nullable;
  
  import com.linecorp.centraldogma.common.Author;
  import com.linecorp.centraldogma.common.Change;
  import com.linecorp.centraldogma.common.Commit;
  import com.linecorp.centraldogma.common.Entry;
  import com.linecorp.centraldogma.common.EntryType;
  import com.linecorp.centraldogma.common.MergedEntry;
  import com.linecorp.centraldogma.common.ProjectRole;
  import com.linecorp.centraldogma.common.RepositoryStatus;
  import com.linecorp.centraldogma.common.Revision;
  import com.linecorp.centraldogma.internal.api.v1.ChangeDto;
  import com.linecorp.centraldogma.internal.api.v1.CommitDto;
  import com.linecorp.centraldogma.internal.api.v1.CommitMessageDto;
  import com.linecorp.centraldogma.internal.api.v1.EntryDto;
  import com.linecorp.centraldogma.internal.api.v1.MergedEntryDto;
  import com.linecorp.centraldogma.internal.api.v1.ProjectDto;
  import com.linecorp.centraldogma.internal.api.v1.PushResultDto;
  import com.linecorp.centraldogma.internal.api.v1.RepositoryDto;
  import com.linecorp.centraldogma.server.metadata.RepositoryMetadata;
  import com.linecorp.centraldogma.server.storage.project.Project;
  import com.linecorp.centraldogma.server.storage.repository.Repository;
  
  /**
   * A utility class to convert domain objects to DTO objects.
   */
  final class DtoConverter {
  
      public static ProjectDto convert(Project project, ProjectRole userRole) {
          requireNonNull(project, "project");
          return new ProjectDto(project.name(), project.author(), userRole, project.creationTimeMillis());
      }
  
      public static RepositoryDto convert(Repository repository,
                                          Map<String, RepositoryMetadata> metadataMap) {
          requireNonNull(repository, "repository");
          final RepositoryStatus status;
          if (metadataMap == null) {
              status = RepositoryStatus.ACTIVE;
          } else {
              final RepositoryMetadata metadata = metadataMap.get(repository.name());
              if (metadata == null) {
                  status = RepositoryStatus.ACTIVE;
              } else {
                  status = metadata.status();
              }
          }
          return convert(repository, status);
      }
  
      public static RepositoryDto convert(Repository repository, RepositoryStatus status) {
          final Revision headRevision = repository.normalizeNow(Revision.HEAD);
          final String projectName = repository.parent().name();
          return new RepositoryDto(projectName, repository.name(), repository.author(), headRevision,
                                   repository.creationTimeMillis(), status);
      }
  
      public static <T> EntryDto<T> convert(Repository repository, Revision revision,
                                            Entry<T> entry, boolean withContent) {
          requireNonNull(entry, "entry");
          if (withContent && entry.hasContent()) {
              return convert(repository, revision, entry.path(), entry.type(), entry.content());
          }
          return convert(repository, revision, entry.path(), entry.type());
      }
  
      private static <T> EntryDto<T> convert(Repository repository, Revision revision,
                                             String path, EntryType type) {
          return convert(repository, revision, path, type, null);
      }
  
      private static <T> EntryDto<T> convert(Repository repository, Revision revision, String path,
                                             EntryType type, @Nullable T content) {
          requireNonNull(repository, "repository");
          return new EntryDto<>(requireNonNull(revision, "revision"),
                                requireNonNull(path, "path"),
                                requireNonNull(type, "type"),
                               repository.parent().name(),
                               repository.name(),
                               content);
     }
 
     public static PushResultDto convert(Revision revision, long commitTimeMillis) {
         return new PushResultDto(revision, commitTimeMillis);
     }
 
     public static CommitDto convert(Commit commit) {
         requireNonNull(commit, "commit");
 
         return convert(commit.revision(), commit.author(),
                        new CommitMessageDto(commit.summary(), commit.detail(), commit.markup()),
                        commit.when());
     }
 
     public static CommitDto convert(Revision revision, Author author, CommitMessageDto commitMessage,
                                     long commitTimeMillis) {
         return new CommitDto(revision, author, commitMessage, commitTimeMillis);
     }
 
     public static <T> ChangeDto<T> convert(Change<T> change) {
         requireNonNull(change, "change");
         return new ChangeDto<>(change.path(), change.type(), change.content());
     }
 
     public static <T> MergedEntryDto<T> convert(MergedEntry<T> mergedEntry) {
         requireNonNull(mergedEntry, "mergedEntry");
         return new MergedEntryDto<>(mergedEntry.revision(), mergedEntry.type(),
                                     mergedEntry.content(), mergedEntry.paths());
     }
 
     private DtoConverter() {}
 }