/**
 * Copyright (c) 2010, Sebastian Sdorra
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of SCM-Manager; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */



package sonia.scm;

//~--- non-JDK imports --------------------------------------------------------

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.UnavailableSecurityManagerException;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.subject.support.SubjectThreadState;
import org.apache.shiro.util.LifecycleUtils;
import org.apache.shiro.util.ThreadState;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;

import sonia.scm.util.IOUtil;
import sonia.scm.util.MockUtil;

import static org.junit.Assert.*;

//~--- JDK imports ------------------------------------------------------------

import java.io.File;

import java.util.UUID;

/**
 *
 * @author Sebastian Sdorra
 */
public class AbstractTestBase
{

  /** Field description */
  private static ThreadState subjectThreadState;

  //~--- methods --------------------------------------------------------------

  /**
   * Method description
   *
   */
  @AfterClass
  public static void tearDownShiro()
  {
    doClearSubject();

    try
    {
      org.apache.shiro.mgt.SecurityManager securityManager =
        getSecurityManager();

      LifecycleUtils.destroy(securityManager);
    }
    catch (UnavailableSecurityManagerException e)
    {

      // we don't care about this when cleaning up the test environment
      // (for example, maybe the subclass is a unit test and it didn't
      // need a SecurityManager instance because it was using only
      // mock Subject instances)
    }

    setSecurityManager(null);
  }

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @return
   */
  protected static org.apache.shiro.mgt.SecurityManager getSecurityManager()
  {
    return SecurityUtils.getSecurityManager();
  }

  //~--- set methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param securityManager
   */
  protected static void setSecurityManager(
    org.apache.shiro.mgt.SecurityManager securityManager)
  {
    SecurityUtils.setSecurityManager(securityManager);
  }

  //~--- methods --------------------------------------------------------------

  /**
   * Method description
   *
   */
  private static void doClearSubject()
  {
    if (subjectThreadState != null)
    {
      subjectThreadState.clear();
      subjectThreadState = null;
    }
  }

  /**
   * Method description
   *
   *
   * @throws Exception
   */
  @After
  public void tearDownTest() throws Exception
  {
    try
    {
      preTearDown();
    }
    finally
    {
      IOUtil.delete(tempDirectory);
    }
  }

  //~--- set methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @throws Exception
   */
  @Before
  public void setUpTest() throws Exception
  {
    tempDirectory = new File(System.getProperty("java.io.tmpdir"),
      UUID.randomUUID().toString());
    assertTrue(tempDirectory.mkdirs());
    contextProvider = MockUtil.getSCMContextProvider(tempDirectory);
    postSetUp();
  }

  //~--- methods --------------------------------------------------------------

  /**
   * Clears Shiro's thread state, ensuring the thread remains clean for 
   * future test execution.
   */
  protected void clearSubject()
  {
    doClearSubject();
  }

  /**
   * Method description
   *
   *
   * @param subject
   *
   * @return
   */
  protected ThreadState createThreadState(Subject subject)
  {
    return new SubjectThreadState(subject);
  }

  /**
   * Method description
   *
   *
   * @throws Exception
   */
  protected void postSetUp() throws Exception {}

  /**
   * Method description
   *
   *
   * @throws Exception
   */
  protected void preTearDown() throws Exception {}

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @return
   */
  protected Subject getSubject()
  {
    return SecurityUtils.getSubject();
  }

  //~--- set methods ----------------------------------------------------------

  /**
   * Allows subclasses to set the currently executing {@link Subject} instance.
   *
   * @param subject the Subject instance
   */
  protected void setSubject(Subject subject)
  {
    clearSubject();
    subjectThreadState = createThreadState(subject);
    subjectThreadState.bind();
  }

  //~--- fields ---------------------------------------------------------------

  /** Field description */
  protected SCMContextProvider contextProvider;

  /** Field description */
  private File tempDirectory;
}