/*
    * Copyright 2023 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.xds.internal;
  
  import java.util.concurrent.CompletionStage;
  
  import com.google.common.base.MoreObjects;
  
  import com.linecorp.armeria.common.annotation.Nullable;
  import com.linecorp.armeria.common.util.UnmodifiableFuture;
  import com.linecorp.centraldogma.server.plugin.AllReplicasPlugin;
  import com.linecorp.centraldogma.server.plugin.PluginContext;
  import com.linecorp.centraldogma.server.plugin.PluginInitContext;
  import com.linecorp.centraldogma.server.plugin.PluginTarget;
  import com.linecorp.centraldogma.server.storage.project.InternalProjectInitializer;
  
  public final class ControlPlanePlugin extends AllReplicasPlugin {
  
      public static final String XDS_CENTRAL_DOGMA_PROJECT = "@xds";
  
      @Nullable
      private volatile ControlPlaneService controlPlaneService;
  
      @Override
      public void init(PluginInitContext pluginInitContext) {
          final InternalProjectInitializer projectInitializer = pluginInitContext.internalProjectInitializer();
          projectInitializer.initialize(XDS_CENTRAL_DOGMA_PROJECT);
          final ControlPlaneService controlPlaneService = new ControlPlaneService(
                  pluginInitContext.projectManager().get(XDS_CENTRAL_DOGMA_PROJECT),
                  pluginInitContext.meterRegistry());
          this.controlPlaneService = controlPlaneService;
          controlPlaneService.start(pluginInitContext);
      }
  
      @Override
      public CompletionStage<Void> start(PluginContext context) {
          return UnmodifiableFuture.completedFuture(null);
      }
  
      @Override
      public CompletionStage<Void> stop(PluginContext context) {
          final ControlPlaneService controlPlaneService = this.controlPlaneService;
          if (controlPlaneService != null) {
              controlPlaneService.stop();
          }
          return UnmodifiableFuture.completedFuture(null);
      }
  
      @Override
      public Class<?> configType() {
          return ControlPlanePluginConfig.class;
      }
  
      @Override
      public String toString() {
          return MoreObjects.toStringHelper(this)
                            .add("configType", configType().getName())
                            .add("target", PluginTarget.ALL_REPLICAS)
                            .toString();
      }
  }