/*
    * Copyright 2025 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;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Set;
  import java.util.concurrent.TimeUnit;
  
  import javax.annotation.Nullable;
  
  import org.eclipse.jgit.storage.file.FileBasedConfig;
  import org.eclipse.jgit.transport.RefSpec;
  import org.eclipse.jgit.util.FS;
  
  public final class EmptyGitConfig extends FileBasedConfig {
  
      private static final String[] EMPTY_STRING_ARRAY = {};
  
      public static final FileBasedConfig INSTANCE = new EmptyGitConfig();
  
      private EmptyGitConfig() {
          super(null, null, null);
      }
  
      @Override
      public void load() {
          // Do nothing because we don't want to load anything from external sources.
      }
  
      @Override
      public void save() throws IOException {
          // Do nothing.
      }
  
      @Override
      public boolean isOutdated() {
          return false;
      }
  
      @Override
      public int getInt(String section, String name, int defaultValue) {
          return defaultValue;
      }
  
      @Override
      public int getInt(String section, String subsection, String name, int defaultValue) {
          return defaultValue;
      }
  
      @Override
      public long getLong(String section, String name, long defaultValue) {
          return defaultValue;
      }
  
      @Override
      public long getLong(String section, String subsection, String name, long defaultValue) {
          return defaultValue;
      }
  
      @Override
      public boolean getBoolean(String section, String name, boolean defaultValue) {
          return defaultValue;
      }
  
      @Override
      public boolean getBoolean(String section, String subsection, String name, boolean defaultValue) {
          return defaultValue;
      }
  
      @Override
      public <T extends Enum<?>> T getEnum(String section, String subsection, String name, T defaultValue) {
          return defaultValue;
      }
  
      @Override
      public <T extends Enum<?>> T getEnum(T[] all, String section, String subsection, String name,
                                           T defaultValue) {
          return defaultValue;
      }
  
      @Override
     @Nullable
     public String getString(String section, String subsection, String name) {
         return null;
     }
 
     @Override
     public String[] getStringList(String section, String subsection, String name) {
         return EMPTY_STRING_ARRAY;
     }
 
     @Override
     public long getTimeUnit(String section, String subsection, String name, long defaultValue,
                             TimeUnit wantUnit) {
         return defaultValue;
     }
 
     @Override
     public Path getPath(String section, String subsection, String name, FS fs, File resolveAgainst,
                         Path defaultValue) {
         return defaultValue;
     }
 
     @Override
     public List<RefSpec> getRefSpecs(String section, String subsection, String name) {
         // We return a mutable list to match the original behavior.
         return new ArrayList<>();
     }
 
     @Override
     public Set<String> getSubsections(String section) {
         return Collections.emptySet();
     }
 
     @Override
     public Set<String> getSections() {
         return Collections.emptySet();
     }
 
     @Override
     public Set<String> getNames(String section) {
         return Collections.emptySet();
     }
 
     @Override
     public Set<String> getNames(String section, String subsection) {
         return Collections.emptySet();
     }
 
     @Override
     public Set<String> getNames(String section, boolean recursive) {
         return Collections.emptySet();
     }
 
     @Override
     public Set<String> getNames(String section, String subsection, boolean recursive) {
         return Collections.emptySet();
     }
 
     @Override
     public <T> T get(SectionParser<T> parser) {
         return parser.parse(this);
     }
 
     @Override
     public String toText() {
         return "";
     }
 
     @Override
     public String toString() {
         // super.toString() triggers a NullPointerException because it assumes getFile() returns non-null,
         // which is not the case for us.
         return getClass().getSimpleName();
     }
 }