/*
    * 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.surefire.junitcore;
  
  import java.io.File;
  import java.io.PrintStream;
  import java.util.HashMap;
  import java.util.concurrent.ExecutionException;
  
  import org.apache.maven.plugin.surefire.StartupReportConfiguration;
  import org.apache.maven.plugin.surefire.extensions.SurefireConsoleOutputReporter;
  import org.apache.maven.plugin.surefire.extensions.SurefireStatelessReporter;
  import org.apache.maven.plugin.surefire.extensions.SurefireStatelessTestsetInfoReporter;
  import org.apache.maven.plugin.surefire.log.api.NullConsoleLogger;
  import org.apache.maven.plugin.surefire.report.DefaultReporterFactory;
  import org.apache.maven.surefire.api.report.ReporterFactory;
  import org.apache.maven.surefire.api.testset.TestSetFailedException;
  import org.junit.runner.Computer;
  import org.junit.runner.JUnitCore;
  import org.junit.runner.Result;
  
  import static org.apache.maven.surefire.api.report.ConsoleOutputCapture.startCapture;
  import static org.apache.maven.surefire.junitcore.ConcurrentRunListener.createInstance;
  
  /**
   * @author Kristian Rosenvold
   */
  public class JUnitCoreTester {
      private final Computer computer;
  
      public JUnitCoreTester() {
          this(new Computer());
      }
  
      public JUnitCoreTester(Computer computer) {
          this.computer = computer;
      }
  
      public Result run(boolean parallelClasses, Class<?>... classes) throws TestSetFailedException, ExecutionException {
          ReporterFactory reporterManagerFactory = defaultNoXml();
          PrintStream out = System.out;
          PrintStream err = System.err;
          try {
              HashMap<String, TestSet> classMethodCounts = new HashMap<>();
              ConcurrentRunListener reporter =
                      createInstance(classMethodCounts, reporterManagerFactory, parallelClasses, false);
              JUnitCoreRunListener runListener = new JUnitCoreRunListener(reporter, classMethodCounts);
              startCapture(runListener);
              JUnitCore junitCore = new JUnitCore();
  
              junitCore.addListener(runListener);
              final Result run = junitCore.run(computer, classes);
              junitCore.removeListener(runListener);
              return run;
          } finally {
              System.setOut(out);
              System.setErr(err);
              reporterManagerFactory.close();
              if (computer instanceof ConfigurableParallelComputer) {
                  ((ConfigurableParallelComputer) computer).close();
              }
          }
      }
  
      /**
       * For testing purposes only.
       *
       * @return DefaultReporterFactory for testing purposes
       */
      public static DefaultReporterFactory defaultNoXml() {
          return new DefaultReporterFactory(defaultStartupReportConfiguration(), new NullConsoleLogger());
      }
  
      /**
       * For testing purposes only.
       *
       * @return StartupReportConfiguration fo testing purposes
       */
      private static StartupReportConfiguration defaultStartupReportConfiguration() {
          File target = new File("./target");
          File statisticsFile = new File(target, "TESTHASHxXML");
          return new StartupReportConfiguration(
                  true,
                 true,
                 "PLAIN",
                 false,
                 target,
                 false,
                 null,
                 statisticsFile,
                 false,
                 0,
                 null,
                 null,
                 false,
                 new SurefireStatelessReporter(),
                 new SurefireConsoleOutputReporter(),
                 new SurefireStatelessTestsetInfoReporter());
     }
 }