/*
    * 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.storage.repository.cache;
  
  import static java.util.Objects.requireNonNull;
  
  import java.util.Map;
  import java.util.Objects;
  import java.util.concurrent.CompletableFuture;
  
  import com.google.common.base.MoreObjects.ToStringHelper;
  
  import com.linecorp.centraldogma.common.Entry;
  import com.linecorp.centraldogma.common.Revision;
  import com.linecorp.centraldogma.server.internal.storage.repository.CacheableCall;
  import com.linecorp.centraldogma.server.storage.repository.FindOption;
  import com.linecorp.centraldogma.server.storage.repository.Repository;
  
  final class CacheableFindCall extends CacheableCall<Map<String, Entry<?>>> {
  
      final Revision revision;
      final String pathPattern;
      final Map<FindOption<?>, ?> options;
      private final int hashCode;
  
      CacheableFindCall(Repository repo, Revision revision, String pathPattern, Map<FindOption<?>, ?> options) {
          super(repo);
  
          this.revision = requireNonNull(revision, "revision");
          this.pathPattern = requireNonNull(pathPattern, "pathPattern");
          this.options = requireNonNull(options, "options");
  
          hashCode = Objects.hash(pathPattern, options) * 31 + System.identityHashCode(repo);
  
          assert !revision.isRelative();
      }
  
      @Override
      protected int weigh(Map<String, Entry<?>> value) {
          int weight = 0;
          weight += pathPattern.length();
          weight += options.size();
          for (Entry<?> e : value.values()) {
              weight += e.path().length();
              if (e.hasContent()) {
                  weight += e.contentAsText().length();
              }
          }
          return weight;
      }
  
      @Override
      public CompletableFuture<Map<String, Entry<?>>> execute() {
          return repo().find(revision, pathPattern, options);
      }
  
      @Override
      public int hashCode() {
          return hashCode;
      }
  
      @Override
      public boolean equals(Object o) {
          if (!super.equals(o)) {
              return false;
          }
  
          final CacheableFindCall that = (CacheableFindCall) o;
          return revision.equals(that.revision) &&
                 pathPattern.equals(that.pathPattern) &&
                 options.equals(that.options);
      }
  
      @Override
      protected void toString(ToStringHelper helper) {
          helper.add("revision", revision)
                .add("pathPattern", pathPattern)
                .add("options", options);
      }
  }