package org.apache.maven.lifecycle;
   
   /*
    * 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.
   */
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.LinkedHashMap;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.maven.lifecycle.internal.ExecutionPlanItem;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.plugin.MojoExecution;
  import org.apache.maven.plugin.descriptor.MojoDescriptor;
  
  //TODO: lifecycles being executed
  //TODO: what runs in each phase
  //TODO: plugins that need downloading
  //TODO: project dependencies that need downloading
  //TODO: unfortunately the plugins need to be downloaded in order to get the plugin.xml file. need to externalize this
  //      from the plugin archive.
  //TODO: this will be the class that people get in IDEs to modify
  
  public class MavenExecutionPlan
      implements Iterable<ExecutionPlanItem>
  {
  
      /*
         At the moment, this class is totally immutable, and this is in line with thoughts about the
         pre-calculated execution plan that stays the same during the execution.
  
         If deciding to add mutable state to this class, it should be at least considered to
         separate this into a separate mutable structure.
  
       */
  
      private final List<ExecutionPlanItem> planItem;
  
      private final Map<String, ExecutionPlanItem> lastMojoExecutionForAllPhases;
  
      final List<String> phasesInExecutionPlan;
  
      public MavenExecutionPlan( List<ExecutionPlanItem> planItem, DefaultLifecycles defaultLifecycles )
      {
          this.planItem = planItem;
  
          lastMojoExecutionForAllPhases = new LinkedHashMap<>();
  
          LinkedHashSet<String> totalPhaseSet = new LinkedHashSet<>();
          if ( defaultLifecycles != null )
          {
              for ( String phase : getDistinctPhasesInOrderOfExecutionPlanAppearance( planItem ) )
              {
                  final Lifecycle lifecycle = defaultLifecycles.get( phase );
                  if ( lifecycle != null )
                  {
                      totalPhaseSet.addAll( lifecycle.getPhases() );
                  }
              }
          }
          this.phasesInExecutionPlan = new ArrayList<>( totalPhaseSet );
  
          Map<String, ExecutionPlanItem> lastInExistingPhases = new HashMap<>();
          for ( ExecutionPlanItem executionPlanItem : getExecutionPlanItems() )
          {
              lastInExistingPhases.put( executionPlanItem.getLifecyclePhase(), executionPlanItem );
          }
  
          ExecutionPlanItem lastSeenExecutionPlanItem = null;
  
          for ( String phase : totalPhaseSet )
          {
              ExecutionPlanItem forThisPhase = lastInExistingPhases.get( phase );
              if ( forThisPhase != null )
              {
                  lastSeenExecutionPlanItem = forThisPhase;
              }
  
             lastMojoExecutionForAllPhases.put( phase, lastSeenExecutionPlanItem );
         }
     }
 
     public Iterator<ExecutionPlanItem> iterator()
     {
         return getExecutionPlanItems().iterator();
     }
 
     /**
      * Returns the last ExecutionPlanItem in the supplied phase. If no items are in the specified phase,
      * the closest executionPlanItem from an earlier phase item will be returned.
      *
      * @param requestedPhase the requested phase
      *                       The execution plan item
      * @return The ExecutionPlanItem or null if none can be found
      */
     public ExecutionPlanItem findLastInPhase( String requestedPhase )
     {
         return lastMojoExecutionForAllPhases.get( requestedPhase );
     }
 
     private List<ExecutionPlanItem> getExecutionPlanItems()
     {
         return planItem;
     }
 
     private static Iterable<String> getDistinctPhasesInOrderOfExecutionPlanAppearance(
         List<ExecutionPlanItem> planItems )
     {
         LinkedHashSet<String> result = new LinkedHashSet<>();
         for ( ExecutionPlanItem executionPlanItem : planItems )
         {
             final String phase = executionPlanItem.getLifecyclePhase();
             if ( !result.contains( phase ) )
             {
                 result.add( phase );
             }
         }
         return result;
     }
 
     public List<MojoExecution> getMojoExecutions()
     {
         List<MojoExecution> result = new ArrayList<>();
         for ( ExecutionPlanItem executionPlanItem : planItem )
         {
             result.add( executionPlanItem.getMojoExecution() );
         }
         return result;
     }
 
     /**
      * Get set of plugins having a goal/mojo used but not marked @threadSafe
      *
      * @return the set of plugins (without info on which goal is concerned)
      */
     public Set<Plugin> getNonThreadSafePlugins()
     {
         Set<Plugin> plugins = new HashSet<>();
         for ( ExecutionPlanItem executionPlanItem : planItem )
         {
             final MojoExecution mojoExecution = executionPlanItem.getMojoExecution();
             if ( !mojoExecution.getMojoDescriptor().isThreadSafe() )
             {
                 plugins.add( mojoExecution.getPlugin() );
             }
         }
         return plugins;
     }
 
     /**
      * Get set of mojos used but not marked @threadSafe
      *
      * @return the set of mojo descriptors
      */
     public Set<MojoDescriptor> getNonThreadSafeMojos()
     {
         Set<MojoDescriptor> mojos = new HashSet<>();
         for ( ExecutionPlanItem executionPlanItem : planItem )
         {
             final MojoExecution mojoExecution = executionPlanItem.getMojoExecution();
             if ( !mojoExecution.getMojoDescriptor().isThreadSafe() )
             {
                 mojos.add( mojoExecution.getMojoDescriptor() );
             }
         }
         return mojos;
     }
 
     // Used by m2e but will be removed, really.
     @Deprecated
     public List<MojoExecution> getExecutions()
     {
         return getMojoExecutions();
     }
 
     public int size()
     {
         return planItem.size();
     }
 
 }