/*
    * 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.lifecycle.internal;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.lifecycle.LifecycleNotFoundException;
  import org.apache.maven.lifecycle.LifecyclePhaseNotFoundException;
  import org.apache.maven.plugin.InvalidPluginDescriptorException;
  import org.apache.maven.plugin.MojoNotFoundException;
  import org.apache.maven.plugin.PluginDescriptorParsingException;
  import org.apache.maven.plugin.PluginNotFoundException;
  import org.apache.maven.plugin.PluginResolutionException;
  import org.apache.maven.plugin.descriptor.MojoDescriptor;
  import org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException;
  import org.apache.maven.plugin.version.PluginVersionResolutionException;
  import org.apache.maven.project.MavenProject;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * <p>
   * Calculates the task segments in the build
   * </p>
   * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
   *
   * @since 3.0
   */
  @Named
  @Singleton
  public class DefaultLifecycleTaskSegmentCalculator implements LifecycleTaskSegmentCalculator {
      private final MojoDescriptorCreator mojoDescriptorCreator;
  
      private final LifecyclePluginResolver lifecyclePluginResolver;
  
      @Inject
      public DefaultLifecycleTaskSegmentCalculator(
              MojoDescriptorCreator mojoDescriptorCreator, LifecyclePluginResolver lifecyclePluginResolver) {
          this.mojoDescriptorCreator = mojoDescriptorCreator;
          this.lifecyclePluginResolver = lifecyclePluginResolver;
      }
  
      @Override
      public List<TaskSegment> calculateTaskSegments(MavenSession session)
              throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
                      MojoNotFoundException, NoPluginFoundForPrefixException, InvalidPluginDescriptorException,
                      PluginVersionResolutionException, LifecyclePhaseNotFoundException, LifecycleNotFoundException {
  
          MavenProject rootProject = session.getTopLevelProject();
  
          List<String> tasks = requireNonNull(session.getGoals()); // session never returns null, but empty list
  
          if (tasks.isEmpty()
                  && (rootProject.getDefaultGoal() != null
                          && !rootProject.getDefaultGoal().isEmpty())) {
              tasks = Stream.of(rootProject.getDefaultGoal().split("\\s+"))
                      .filter(g -> !g.isEmpty())
                      .collect(Collectors.toList());
          }
  
          return calculateTaskSegments(session, tasks);
      }
  
      @Override
      public List<TaskSegment> calculateTaskSegments(MavenSession session, List<String> tasks)
              throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
                      MojoNotFoundException, NoPluginFoundForPrefixException, InvalidPluginDescriptorException,
                      PluginVersionResolutionException {
          List<TaskSegment> taskSegments = new ArrayList<>(tasks.size());
  
          TaskSegment currentSegment = null;
  
          for (String task : tasks) {
              if (isGoalSpecification(task)) {
                  // "pluginPrefix[:version]:goal" or "groupId:artifactId[:version]:goal"
 
                 lifecyclePluginResolver.resolveMissingPluginVersions(session.getTopLevelProject(), session);
 
                 MojoDescriptor mojoDescriptor =
                         mojoDescriptorCreator.getMojoDescriptor(task, session, session.getTopLevelProject());
 
                 boolean aggregating = mojoDescriptor.isAggregator() || !mojoDescriptor.isProjectRequired();
 
                 if (currentSegment == null || currentSegment.isAggregating() != aggregating) {
                     currentSegment = new TaskSegment(aggregating);
                     taskSegments.add(currentSegment);
                 }
 
                 currentSegment.getTasks().add(new GoalTask(task));
             } else {
                 // lifecycle phase
 
                 if (currentSegment == null || currentSegment.isAggregating()) {
                     currentSegment = new TaskSegment(false);
                     taskSegments.add(currentSegment);
                 }
 
                 currentSegment.getTasks().add(new LifecycleTask(task));
             }
         }
 
         return taskSegments;
     }
 
     @Override
     public boolean requiresProject(MavenSession session) {
         List<String> goals = session.getGoals();
         if (goals != null) {
             for (String goal : goals) {
                 if (!isGoalSpecification(goal)) {
                     return true;
                 }
             }
         }
         return false;
     }
 
     private boolean isGoalSpecification(String task) {
         return task.indexOf(':') >= 0;
     }
 }