/*
 * JBoss, Home of Professional Open Source
 * Copyright 2009 Red Hat Inc. and/or its affiliates and other contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * Licensed 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.jboss.arquillian.junit.container;

import org.jboss.arquillian.container.test.spi.TestRunner;
import org.jboss.arquillian.junit.State;
import org.jboss.arquillian.test.spi.TestResult;
import org.junit.Test;
import org.junit.internal.AssumptionViolatedException;
import org.junit.runner.Description;
import org.junit.runner.JUnitCore;
import org.junit.runner.Request;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
import org.junit.runner.notification.RunListener;

import java.util.Collections;
import java.util.List;

/**
 * JUnitTestRunner
 *
 * A Implementation of the Arquillian TestRunner SPI for JUnit.
 *
 * @author <a href="mailto:aslak@conduct.no">Aslak Knutsen</a>
 * @author thomas.diesler@jboss.com
 * @version $Revision: $
 */
public class JUnitTestRunner implements TestRunner
{
   /**
    * Overwrite to provide additional run listeners.
    */
   protected List<RunListener> getRunListeners()
   {
      return Collections.emptyList();
   }

   public TestResult execute(Class<?> testClass, String methodName)
   {
      TestResult testResult;
      ExpectedExceptionHolder exceptionHolder = new ExpectedExceptionHolder();
      try
      {
          JUnitCore runner = new JUnitCore();

          runner.addListener(exceptionHolder);

          for (RunListener listener : getRunListeners())
             runner.addListener(listener);

          Result result = runner.run(Request.method(testClass, methodName));

          if (result.getFailureCount() > 0)
          {
             testResult = TestResult.failed(exceptionHolder.getException());
          }
          else if (result.getIgnoreCount() > 0)
          {
              testResult = TestResult.skipped(); // Will this ever happen incontainer?
          }
          else {
              testResult = TestResult.passed();
          }
          if(testResult.getThrowable() == null) {
              testResult.setThrowable(exceptionHolder.getException());
          }
      }
      catch (Throwable th) {
          testResult = TestResult.failed(th);
      }
      if(testResult.getThrowable() instanceof AssumptionViolatedException) {
          testResult = TestResult.skipped(testResult.getThrowable());
      }
      testResult.setEnd(System.currentTimeMillis());
      return testResult;
   }

   private class ExpectedExceptionHolder extends RunListener
   {
      private Throwable exception;

      public Throwable getException()
      {
         return exception;
      }

      @Override
      public void testAssumptionFailure(Failure failure) {
          // AssumptionViolatedException might not be Serializable. Recreate with only String message.
          exception = new AssumptionViolatedException(failure.getException().getMessage());
          exception.setStackTrace(failure.getException().getStackTrace());;
      }

      @Override
      public void testFailure(Failure failure) throws Exception {
          if (exception != null) {
              // In case of multiple errors only keep the first exception
              return;
          }
          exception = State.getTestException();
          Test test = failure.getDescription().getAnnotation(Test.class);
          if ( !(test != null && test.expected() != Test.None.class))
          {
              // Not Expected Exception, and non thrown internally
              if(exception == null) {
                  exception = failure.getException();
              }
          }
      }

      @Override
      public void testFinished(Description description) throws Exception {
          Test test = description.getAnnotation(Test.class);
          if (test != null && test.expected() != Test.None.class)
          {
              if(exception == null) {
                  exception = State.getTestException();
              }
          }
          State.caughtTestException(null);
      }
   }
}
