/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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
    *
   *   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.apache.maven.plugin;
  
  import java.util.Iterator;
  import java.util.List;
  import java.util.Objects;
  
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.Exclusion;
  import org.apache.maven.model.Plugin;
  
  /**
   * @author Benjamin Bentmann
   */
  class CacheUtils {
  
      /**
       * @deprecated Use {@link Objects#equals(Object)}
       */
      @Deprecated
      public static <T> boolean eq(T s1, T s2) {
          return Objects.equals(s1, s2);
      }
  
      /**
       * @deprecated Use {@link Objects#hashCode(Object)}
       */
      @Deprecated
      public static int hash(Object obj) {
          return obj != null ? obj.hashCode() : 0;
      }
  
      public static int pluginHashCode(Plugin plugin) {
          int hash = 17;
  
          hash = hash * 31 + Objects.hashCode(plugin.getGroupId());
          hash = hash * 31 + Objects.hashCode(plugin.getArtifactId());
          hash = hash * 31 + Objects.hashCode(plugin.getVersion());
  
          hash = hash * 31 + (plugin.isExtensions() ? 1 : 0);
  
          for (Dependency dependency : plugin.getDependencies()) {
              hash = hash * 31 + Objects.hashCode(dependency.getGroupId());
              hash = hash * 31 + Objects.hashCode(dependency.getArtifactId());
              hash = hash * 31 + Objects.hashCode(dependency.getVersion());
              hash = hash * 31 + Objects.hashCode(dependency.getType());
              hash = hash * 31 + Objects.hashCode(dependency.getClassifier());
              hash = hash * 31 + Objects.hashCode(dependency.getScope());
  
              for (Exclusion exclusion : dependency.getExclusions()) {
                  hash = hash * 31 + Objects.hashCode(exclusion.getGroupId());
                  hash = hash * 31 + Objects.hashCode(exclusion.getArtifactId());
              }
          }
  
          return hash;
      }
  
      public static boolean pluginEquals(Plugin a, Plugin b) {
          return Objects.equals(a.getArtifactId(), b.getArtifactId()) //
                  && Objects.equals(a.getGroupId(), b.getGroupId()) //
                  && Objects.equals(a.getVersion(), b.getVersion()) //
                  && a.isExtensions() == b.isExtensions() //
                  && dependenciesEquals(a.getDependencies(), b.getDependencies());
      }
  
      private static boolean dependenciesEquals(List<Dependency> a, List<Dependency> b) {
          if (a.size() != b.size()) {
              return false;
          }
  
          Iterator<Dependency> aI = a.iterator();
          Iterator<Dependency> bI = b.iterator();
  
          while (aI.hasNext()) {
              Dependency aD = aI.next();
              Dependency bD = bI.next();
  
              boolean r = Objects.equals(aD.getGroupId(), bD.getGroupId()) //
                      && Objects.equals(aD.getArtifactId(), bD.getArtifactId()) //
                      && Objects.equals(aD.getVersion(), bD.getVersion()) //
                      && Objects.equals(aD.getType(), bD.getType()) //
                     && Objects.equals(aD.getClassifier(), bD.getClassifier()) //
                     && Objects.equals(aD.getScope(), bD.getScope());
 
             r &= exclusionsEquals(aD.getExclusions(), bD.getExclusions());
 
             if (!r) {
                 return false;
             }
         }
 
         return true;
     }
 
     private static boolean exclusionsEquals(List<Exclusion> a, List<Exclusion> b) {
         if (a.size() != b.size()) {
             return false;
         }
 
         Iterator<Exclusion> aI = a.iterator();
         Iterator<Exclusion> bI = b.iterator();
 
         while (aI.hasNext()) {
             Exclusion aD = aI.next();
             Exclusion bD = bI.next();
 
             boolean r = Objects.equals(aD.getGroupId(), bD.getGroupId()) //
                     && Objects.equals(aD.getArtifactId(), bD.getArtifactId());
 
             if (!r) {
                 return false;
             }
         }
 
         return true;
     }
 }