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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.module.reboot.internal;

import org.mule.runtime.module.reboot.MuleContainerBootstrap;

import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import org.tanukisoftware.wrapper.WrapperListener;
import org.tanukisoftware.wrapper.WrapperManager;

public class MuleContainerWrapper implements WrapperListener {

  protected static final String CLASSNAME_MULE_CONTAINER = "org.mule.runtime.module.launcher.MuleContainer";

  /**
   * We can't reference MuleContainer class literal here, as it will fail to resolve at runtime. Instead, make all calls anonymous
   * through reflection, so we can safely pump up our new classloader and make it the default one for downstream applications.
   */
  private Object mule;

  /*---------------------------------------------------------------
   * WrapperListener Methods
   *-------------------------------------------------------------*/
  /**
   * The start method is called when the WrapperManager is signaled by the native wrapper code that it can start its application.
   * This method call is expected to return, so a new thread should be launched if necessary.
   *
   * @param args List of arguments used to initialize the application.
   * @return Any error code if the application should exit on completion of the start method. If there were no problems then this
   *         method should return null.
   */
  public Integer start(String[] args) {
    try {
      ClassLoader muleSystemCl = createContainerSystemClassLoader();

      Thread.currentThread().setContextClassLoader(muleSystemCl);

      Class muleClass = Thread.currentThread().getContextClassLoader().loadClass(CLASSNAME_MULE_CONTAINER);
      Constructor c = muleClass.getConstructor(String[].class);
      mule = c.newInstance(new Object[] {args});
      Method startMethod = muleClass.getMethod("start", boolean.class);
      startMethod.invoke(mule, true);
      return null;
    } catch (Exception e) {
      e.printStackTrace();
      return 1;
    }
  }

  protected ClassLoader createContainerSystemClassLoader() throws Exception {
    File muleHome = MuleContainerBootstrap.lookupMuleHome();
    File muleBase = MuleContainerBootstrap.lookupMuleBase();
    DefaultMuleClassPathConfig config = new DefaultMuleClassPathConfig(muleHome, muleBase);

    return new MuleContainerSystemClassLoader(config);
  }

  /**
   * Called when the application is shutting down. The Wrapper assumes that this method will return fairly quickly. If the
   * shutdown code code could potentially take a long time, then WrapperManager.signalStopping() should be called to extend the
   * timeout period. If for some reason, the stop method can not return, then it must call WrapperManager.stopped() to avoid
   * warning messages from the Wrapper.
   *
   * @param exitCode The suggested exit code that will be returned to the OS when the JVM exits.
   * @return The exit code to actually return to the OS. In most cases, this should just be the value of exitCode, however the
   *         user code has the option of changing the exit code if there are any problems during shutdown.
   */
  public int stop(int exitCode) {
    try {
      Method shutdownMethod = mule.getClass().getMethod("shutdown");
      shutdownMethod.invoke(mule);
    } catch (Throwable t) {
      // ignore
    }

    return exitCode;
  }

  /**
   * Called whenever the native wrapper code traps a system control signal against the Java process. It is up to the callback to
   * take any actions necessary. Possible values are: WrapperManager.WRAPPER_CTRL_C_EVENT, WRAPPER_CTRL_CLOSE_EVENT,
   * WRAPPER_CTRL_LOGOFF_EVENT, or WRAPPER_CTRL_SHUTDOWN_EVENT
   *
   * @param event The system control signal.
   */
  public void controlEvent(int event) {
    if (WrapperManager.isControlledByNativeWrapper()) {
      // The Wrapper will take care of this event
    } else {
      // We are not being controlled by the Wrapper, so
      // handle the event ourselves.
      if ((event == WrapperManager.WRAPPER_CTRL_C_EVENT) || (event == WrapperManager.WRAPPER_CTRL_CLOSE_EVENT)
          || (event == WrapperManager.WRAPPER_CTRL_SHUTDOWN_EVENT)) {
        WrapperManager.stop(0);
      }
    }
  }
}