/*
    * 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.model.profile;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  
  import org.apache.maven.model.Activation;
  import org.apache.maven.model.Profile;
  import org.apache.maven.model.building.ModelProblem.Severity;
  import org.apache.maven.model.building.ModelProblem.Version;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.building.ModelProblemCollectorRequest;
  import org.apache.maven.model.profile.activation.ProfileActivator;
  
  /**
   * Calculates the active profiles among a given collection of profiles.
   *
   * @author Benjamin Bentmann
   */
  @Named
  @Singleton
  public class DefaultProfileSelector implements ProfileSelector {
  
      private final List<ProfileActivator> activators;
  
      public DefaultProfileSelector() {
          this.activators = Collections.emptyList();
      }
  
      @Inject
      public DefaultProfileSelector(List<ProfileActivator> activators) {
          this.activators = new ArrayList<>(activators);
      }
  
      public DefaultProfileSelector addProfileActivator(ProfileActivator profileActivator) {
          if (profileActivator != null) {
              activators.add(profileActivator);
          }
          return this;
      }
  
      @Override
      public List<Profile> getActiveProfiles(
              Collection<Profile> profiles, ProfileActivationContext context, ModelProblemCollector problems) {
          Collection<String> activatedIds = new HashSet<>(context.getActiveProfileIds());
          Collection<String> deactivatedIds = new HashSet<>(context.getInactiveProfileIds());
  
          List<Profile> activeProfiles = new ArrayList<>(profiles.size());
          List<Profile> activePomProfilesByDefault = new ArrayList<>();
          boolean activatedPomProfileNotByDefault = false;
  
          for (Profile profile : profiles) {
              if (!deactivatedIds.contains(profile.getId())) {
                  if (activatedIds.contains(profile.getId()) || isActive(profile, context, problems)) {
                      activeProfiles.add(profile);
  
                      if (Profile.SOURCE_POM.equals(profile.getSource())) {
                          activatedPomProfileNotByDefault = true;
                      }
                  } else if (isActiveByDefault(profile)) {
                      if (Profile.SOURCE_POM.equals(profile.getSource())) {
                          activePomProfilesByDefault.add(profile);
                      } else {
                          activeProfiles.add(profile);
                      }
                  }
              }
          }
  
          if (!activatedPomProfileNotByDefault) {
              activeProfiles.addAll(activePomProfilesByDefault);
          }
  
          return activeProfiles;
      }
 
     private boolean isActive(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {
         boolean isActive = false;
         for (ProfileActivator activator : activators) {
             if (activator.presentInConfig(profile, context, problems)) {
                 isActive = true;
                 try {
                     if (!activator.isActive(profile, context, problems)) {
                         return false;
                     }
                 } catch (RuntimeException e) {
                     problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                             .setMessage("Failed to determine activation for profile " + profile.getId())
                             .setLocation(profile.getLocation(""))
                             .setException(e));
                     return false;
                 }
             }
         }
         return isActive;
     }
 
     private boolean isActiveByDefault(Profile profile) {
         Activation activation = profile.getActivation();
         return activation != null && activation.isActiveByDefault();
     }
 }