/*
    * 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.execution;
  
  import static java.util.stream.Collectors.toSet;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Set;
  import java.util.function.Predicate;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  /**
   * Container for storing the request from the user to activate or deactivate certain projects and optionally fail the
   * build if those projects do not exist.
   */
  public class ProjectActivation {
      private static class ProjectActivationSettings {
          /**
           * The selector of a project. This can be the project directory, [groupId]:[artifactId] or :[artifactId].
           */
          final String selector;
  
          /**
           * This describes how/when to active or deactivate the project.
           */
          final ActivationSettings activationSettings;
  
          ProjectActivationSettings(String selector, ActivationSettings activationSettings) {
              this.selector = selector;
              this.activationSettings = activationSettings;
          }
      }
  
      /**
       * List of activated and deactivated projects.
       */
      private final List<ProjectActivationSettings> activations = new ArrayList<>();
  
      /**
       * Adds a project activation to the request.
       * @param selector The selector of the project.
       * @param active Should the project be activated?
       * @param optional Can the build continue if the project does not exist?
       */
      public void addProjectActivation(String selector, boolean active, boolean optional) {
          final ActivationSettings settings = ActivationSettings.of(active, optional);
          this.activations.add(new ProjectActivationSettings(selector, settings));
      }
  
      private Stream<ProjectActivationSettings> getProjects(final Predicate<ActivationSettings> predicate) {
          return this.activations.stream().filter(activation -> predicate.test(activation.activationSettings));
      }
  
      private Set<String> getProjectSelectors(final Predicate<ActivationSettings> predicate) {
          return getProjects(predicate).map(activation -> activation.selector).collect(toSet());
      }
  
      /**
       * @return Required active project selectors, never {@code null}.
       */
      public Set<String> getRequiredActiveProjectSelectors() {
          return getProjectSelectors(pa -> !pa.optional && pa.active);
      }
  
      /**
       * @return Optional active project selectors, never {@code null}.
       */
      public Set<String> getOptionalActiveProjectSelectors() {
          return getProjectSelectors(pa -> pa.optional && pa.active);
      }
  
      /**
       * @return Required inactive project selectors, never {@code null}.
       */
      public Set<String> getRequiredInactiveProjectSelectors() {
          return getProjectSelectors(pa -> !pa.optional && !pa.active);
      }
  
      /**
       * @return Optional inactive project selectors, never {@code null}.
      */
     public Set<String> getOptionalInactiveProjectSelectors() {
         return getProjectSelectors(pa -> pa.optional && !pa.active);
     }
 
     /**
      * Mimics the pre-Maven 4 "selected projects" list.
      * @deprecated Use {@link #getRequiredActiveProjectSelectors()} and {@link #getOptionalActiveProjectSelectors()}
      * instead.
      */
     @Deprecated
     public List<String> getSelectedProjects() {
         return Collections.unmodifiableList(new ArrayList<>(getProjectSelectors(pa -> pa.active)));
     }
 
     /**
      * Mimics the pre-Maven 4 "excluded projects" list.
      * @deprecated Use {@link #getRequiredInactiveProjectSelectors()} and {@link #getOptionalInactiveProjectSelectors()}
      * instead.
      */
     @Deprecated
     public List<String> getExcludedProjects() {
         return Collections.unmodifiableList(new ArrayList<>(getProjectSelectors(pa -> !pa.active)));
     }
 
     /**
      * Overwrites the active projects based on a pre-Maven 4 "active projects" list.
      * @param activeProjectSelectors A {@link List} of project selectors that must be activated.
      * @deprecated Use {@link #activateOptionalProject(String)} or {@link #activateRequiredProject(String)} instead.
      */
     @Deprecated
     public void overwriteActiveProjects(List<String> activeProjectSelectors) {
         List<ProjectActivationSettings> projects = getProjects(pa -> pa.active).collect(Collectors.toList());
         this.activations.removeAll(projects);
         activeProjectSelectors.forEach(this::activateOptionalProject);
     }
 
     /**
      * Overwrites the inactive projects based on a pre-Maven 4 "inactive projects" list.
      * @param inactiveProjectSelectors A {@link List} of project selectors that must be deactivated.
      * @deprecated Use {@link #deactivateOptionalProject(String)} or {@link #deactivateRequiredProject(String)} instead.
      */
     @Deprecated
     public void overwriteInactiveProjects(List<String> inactiveProjectSelectors) {
         List<ProjectActivationSettings> projects = getProjects(pa -> !pa.active).collect(Collectors.toList());
         this.activations.removeAll(projects);
         inactiveProjectSelectors.forEach(this::deactivateOptionalProject);
     }
 
     /**
      * Mark a project as required and activated.
      * @param selector The selector of the project.
      */
     public void activateRequiredProject(String selector) {
         this.activations.add(new ProjectActivationSettings(selector, ActivationSettings.ACTIVATION_REQUIRED));
     }
 
     /**
      * Mark a project as optional and activated.
      * @param selector The selector of the project.
      */
     public void activateOptionalProject(String selector) {
         this.activations.add(new ProjectActivationSettings(selector, ActivationSettings.ACTIVATION_OPTIONAL));
     }
 
     /**
      * Mark a project as required and deactivated.
      * @param selector The selector of the project.
      */
     public void deactivateRequiredProject(String selector) {
         this.activations.add(new ProjectActivationSettings(selector, ActivationSettings.DEACTIVATION_REQUIRED));
     }
 
     /**
      * Mark a project as optional and deactivated.
      * @param selector The selector of the project.
      */
     public void deactivateOptionalProject(String selector) {
         this.activations.add(new ProjectActivationSettings(selector, ActivationSettings.DEACTIVATION_OPTIONAL));
     }
 
     public boolean isEmpty() {
         return this.activations.isEmpty();
     }
 }