package org.apache.maven.plugin.surefire.runorder;
   
   /*
    * 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 org.apache.maven.surefire.report.ReportEntry;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.FileReader;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.io.Reader;
  import java.util.ArrayList;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import static java.util.Collections.sort;
  import static org.apache.maven.plugin.surefire.runorder.RunEntryStatistics.fromReportEntry;
  import static org.apache.maven.plugin.surefire.runorder.RunEntryStatistics.fromString;
  
  /**
   * @author Kristian Rosenvold
   */
  public final class RunEntryStatisticsMap
  {
      private final Map<String, RunEntryStatistics> runEntryStatistics;
  
      public RunEntryStatisticsMap( Map<String, RunEntryStatistics> runEntryStatistics )
      {
          this.runEntryStatistics = new ConcurrentHashMap<String, RunEntryStatistics>( runEntryStatistics );
      }
  
      public RunEntryStatisticsMap()
      {
          runEntryStatistics = new ConcurrentHashMap<>();
      }
  
      public static RunEntryStatisticsMap fromFile( File file )
      {
          if ( file.exists() )
          {
              try
              {
                  return fromReader( new FileReader( file ) );
              }
              catch ( IOException e )
              {
                  throw new RuntimeException( e );
              }
          }
          else
          {
              return new RunEntryStatisticsMap();
          }
      }
  
      static RunEntryStatisticsMap fromReader( Reader fileReader )
          throws IOException
      {
          Map<String, RunEntryStatistics> result = new HashMap<>();
          BufferedReader bufferedReader = new BufferedReader( fileReader );
          String line = bufferedReader.readLine();
          while ( line != null )
          {
              if ( !line.startsWith( "#" ) )
              {
                  final RunEntryStatistics stats = fromString( line );
                  result.put( stats.getTestName(), stats );
              }
              line = bufferedReader.readLine();
          }
          return new RunEntryStatisticsMap( result );
      }
  
     public void serialize( File file )
         throws FileNotFoundException
     {
         FileOutputStream fos = new FileOutputStream( file );
         try ( PrintWriter printWriter = new PrintWriter( fos ) )
         {
             List<RunEntryStatistics> items = new ArrayList<>( runEntryStatistics.values() );
             sort( items, new RunCountComparator() );
             for ( RunEntryStatistics item : items )
             {
                 printWriter.println( item.toString() );
             }
         }
     }
 
     public RunEntryStatistics findOrCreate( ReportEntry reportEntry )
     {
         final RunEntryStatistics item = runEntryStatistics.get( reportEntry.getName() );
         return item != null ? item : fromReportEntry( reportEntry );
     }
 
     public RunEntryStatistics createNextGeneration( ReportEntry reportEntry )
     {
         final RunEntryStatistics newItem = findOrCreate( reportEntry );
         final Integer elapsed = reportEntry.getElapsed();
         return newItem.nextGeneration( elapsed != null ? elapsed : 0 );
     }
 
     public RunEntryStatistics createNextGenerationFailure( ReportEntry reportEntry )
     {
         final RunEntryStatistics newItem = findOrCreate( reportEntry );
         final Integer elapsed = reportEntry.getElapsed();
         return newItem.nextGenerationFailure( elapsed != null ? elapsed : 0 );
     }
 
     public void add( RunEntryStatistics item )
     {
         runEntryStatistics.put( item.getTestName(), item );
     }
 
     static final class RunCountComparator
         implements Comparator<RunEntryStatistics>
     {
         @Override
         public int compare( RunEntryStatistics o, RunEntryStatistics o1 )
         {
             int runtime = o.getSuccessfulBuilds() - o1.getSuccessfulBuilds();
             return runtime == 0 ? o.getRunTime() - o1.getRunTime() : runtime;
         }
     }
 
     public List<Class<?>> getPrioritizedTestsClassRunTime( List<Class<?>> testsToRun, int threadCount )
     {
         List<PrioritizedTest> prioritizedTests = getPrioritizedTests( testsToRun, new TestRuntimeComparator() );
         ThreadedExecutionScheduler threadedExecutionScheduler = new ThreadedExecutionScheduler( threadCount );
         for ( Object prioritizedTest1 : prioritizedTests )
         {
             threadedExecutionScheduler.addTest( (PrioritizedTest) prioritizedTest1 );
         }
 
         return threadedExecutionScheduler.getResult();
     }
 
     public List<Class<?>> getPrioritizedTestsByFailureFirst( List<Class<?>> testsToRun )
     {
         List<PrioritizedTest> prioritizedTests = getPrioritizedTests( testsToRun, new LeastFailureComparator() );
         return transformToClasses( prioritizedTests );
     }
 
     private List<PrioritizedTest> getPrioritizedTests( List<Class<?>> testsToRun,
                                                        Comparator<Priority> priorityComparator )
     {
         Map classPriorities = getPriorities( priorityComparator );
 
         List<PrioritizedTest> tests = new ArrayList<>();
         for ( Class<?> clazz : testsToRun )
         {
             Priority pri = (Priority) classPriorities.get( clazz.getName() );
             if ( pri == null )
             {
                 pri = Priority.newTestClassPriority( clazz.getName() );
             }
             PrioritizedTest prioritizedTest = new PrioritizedTest( clazz, pri );
             tests.add( prioritizedTest );
         }
         sort( tests, new PrioritizedTestComparator() );
         return tests;
     }
 
     private List<Class<?>> transformToClasses( List<PrioritizedTest> tests )
     {
         List<Class<?>> result = new ArrayList<>();
         for ( PrioritizedTest test : tests )
         {
             result.add( test.getClazz() );
         }
         return result;
     }
 
     private Map getPriorities( Comparator<Priority> priorityComparator )
     {
         Map<String, Priority> priorities = new HashMap<>();
         for ( Object o : runEntryStatistics.keySet() )
         {
             String testNames = (String) o;
             String clazzName = extractClassName( testNames );
             Priority priority = priorities.get( clazzName );
             if ( priority == null )
             {
                 priority = new Priority( clazzName );
                 priorities.put( clazzName, priority );
             }
 
             RunEntryStatistics itemStat = runEntryStatistics.get( testNames );
             priority.addItem( itemStat );
         }
 
         List<Priority> items = new ArrayList<>( priorities.values() );
         sort( items, priorityComparator );
         Map<String, Priority> result = new HashMap<>();
         int i = 0;
         for ( Priority pri : items )
         {
             pri.setPriority( i++ );
             result.put( pri.getClassName(), pri );
         }
         return result;
     }
 
     static final class PrioritizedTestComparator
         implements Comparator<PrioritizedTest>
     {
         @Override
         public int compare( PrioritizedTest o, PrioritizedTest o1 )
         {
             return o.getPriority() - o1.getPriority();
         }
     }
 
     static final class TestRuntimeComparator
         implements Comparator<Priority>
     {
         @Override
         public int compare( Priority o, Priority o1 )
         {
             return o1.getTotalRuntime() - o.getTotalRuntime();
         }
     }
 
     static final class LeastFailureComparator
         implements Comparator<Priority>
     {
         @Override
         public int compare( Priority o, Priority o1 )
         {
             return o.getMinSuccessRate() - o1.getMinSuccessRate();
         }
     }
 
 
     private static final Pattern PARENS = Pattern.compile( "^" + "[^\\(\\)]+" //non-parens
                                                                + "\\((" // then an open-paren (start matching a group)
                                                                + "[^\\\\(\\\\)]+" //non-parens
                                                                + ")\\)" + "$" ); // then a close-paren (end group match)
 
     String extractClassName( String displayName )
     {
         Matcher m = PARENS.matcher( displayName );
         return m.find() ? m.group( 1 ) : displayName;
     }
 }