/*
    * Licensed 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.basepom.mojo.duplicatefinder;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import java.util.Collection;
  import java.util.EnumMap;
  import java.util.EnumSet;
  import java.util.Map;
  import java.util.SortedSet;
  import java.util.stream.Collectors;
  
  import com.google.common.base.Joiner;
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.ListMultimap;
  import com.google.common.collect.Multimap;
  import com.google.common.collect.MultimapBuilder.SetMultimapBuilder;
  import com.google.common.collect.Multimaps;
  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  
  @SuppressFBWarnings("NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE")
  public class ResultCollector {
  
      private final EnumSet<ConflictState> printState;
      private final EnumSet<ConflictState> failState;
  
      private final EnumMap<ConflictType, EnumSet<ConflictState>> seenResults = new EnumMap<>(ConflictType.class);
  
      private final ListMultimap<String, ConflictResult> results = SetMultimapBuilder.linkedHashKeys()
              .arrayListValues()
              .build();
  
      private ConflictState conflictState = ConflictState.NO_CONFLICT;
  
      ResultCollector(final EnumSet<ConflictState> printState, final EnumSet<ConflictState> failState) {
          this.printState = printState;
          this.failState = failState;
  
          for (ConflictType conflictType : ConflictType.values()) {
              seenResults.put(conflictType, EnumSet.noneOf(ConflictState.class));
          }
      }
  
      public ConflictState getConflictState() {
          return conflictState;
      }
  
      public boolean isFailed() {
          return failState.contains(conflictState);
      }
  
      public boolean hasConflictsFor(ConflictType type, ConflictState state) {
          return seenResults.get(type).contains(state);
      }
  
      public void addConflict(ConflictType type, String name, SortedSet<ClasspathElement> conflictingClasspathElements, boolean excepted,
              final ConflictState state) {
          if (!excepted) {
              this.conflictState = ConflictState.max(this.conflictState, state);
  
              // Record the type of conflicts seen.
              seenResults.get(type).add(state);
          }
  
          ConflictResult conflictResult = new ConflictResult(type, name, conflictingClasspathElements, excepted, state);
  
          results.put(conflictResult.getConflictName(), conflictResult);
      }
  
      public Map<String, Collection<ConflictResult>> getResults(final ConflictType type, final ConflictState state) {
          Multimap<String, ConflictResult> result = Multimaps.filterValues(results, conflictResult -> {
              checkNotNull(conflictResult, "conflictResult is null");
              return conflictResult.getConflictState() == state
                      && conflictResult.getType() == type
                      && !conflictResult.isExcepted();
          });
  
          return ImmutableMap.copyOf(result.asMap());
      }
  
      Map<String, Collection<ConflictResult>> getAllResults() {
          return ImmutableMap.copyOf(results.asMap());
      }
  
      private static String buildConflictName(final SortedSet<ClasspathElement> conflictArtifactNames) {
          return Joiner.on(", ").join(conflictArtifactNames.stream()
                 .map(ClasspathElement.getNameFunction())
                 .collect(Collectors.toList()));
     }
 
     public class ConflictResult {
 
         private final ConflictType type;
         private final String name;
         private final SortedSet<ClasspathElement> classpathElements;
         private final boolean excepted;
         private final ConflictState conflictState;
         private final String conflictName;
 
         ConflictResult(final ConflictType type,
                 final String name,
                 final SortedSet<ClasspathElement> classpathElements,
                 final boolean excepted,
                 final ConflictState conflictState) {
             this.type = type;
             this.name = name;
             this.classpathElements = classpathElements;
             this.excepted = excepted;
             this.conflictState = conflictState;
             this.conflictName = ResultCollector.buildConflictName(classpathElements);
         }
 
         public String getName() {
             return name;
         }
 
         public ConflictType getType() {
             return type;
         }
 
         public SortedSet<ClasspathElement> getClasspathElements() {
             return classpathElements;
         }
 
         public boolean isExcepted() {
             return excepted;
         }
 
         public boolean isPrinted() {
             return !excepted && printState.contains(conflictState);
         }
 
         public boolean isFailed() {
             return !excepted && failState.contains(conflictState);
         }
 
         public ConflictState getConflictState() {
             return conflictState;
         }
 
         private String getConflictName() {
             return conflictName;
         }
     }
 }