/*
    * Copyright (C) 2013 4th Line GmbH, Switzerland
    *
    * The contents of this file are subject to the terms of either the GNU
    * Lesser General Public License Version 2 or later ("LGPL") or the
    * Common Development and Distribution License Version 1 or later
    * ("CDDL") (collectively, the "License"). You may not use this file
    * except in compliance with the License. See LICENSE.txt for more
    * information.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   */
  
  package org.fourthline.cling.controlpoint;
  
  import org.fourthline.cling.model.action.ActionException;
  import org.fourthline.cling.model.action.ActionInvocation;
  import org.fourthline.cling.model.message.UpnpResponse;
  import org.fourthline.cling.model.message.control.IncomingActionResponseMessage;
  import org.fourthline.cling.model.meta.LocalService;
  import org.fourthline.cling.model.meta.RemoteService;
  import org.fourthline.cling.model.meta.Service;
  import org.fourthline.cling.protocol.sync.SendingAction;
  
  import java.net.URL;
  
  /**
   * Execute actions on any service.
   * <p>
   * Usage example for asynchronous execution in a background thread:
   * </p>
   * <pre>
   * Service service = device.findService(new UDAServiceId("SwitchPower"));
   * Action getStatusAction = service.getAction("GetStatus");
   * ActionInvocation getStatusInvocation = new ActionInvocation(getStatusAction);
   *
   * ActionCallback getStatusCallback = new ActionCallback(getStatusInvocation) {
   *
   *      public void success(ActionInvocation invocation) {
   *          ActionArgumentValue status  = invocation.getOutput("ResultStatus");
   *          assertEquals((Boolean) status.getValue(), Boolean.valueOf(false));
   *      }
   *
   *      public void failure(ActionInvocation invocation, UpnpResponse res) {
   *          System.err.println(
   *              createDefaultFailureMessage(invocation, res)
   *          );
   *      }
   * };
   *
   * upnpService.getControlPoint().execute(getStatusCallback)
   * </pre>
   * <p>
   * You can also execute the action synchronously in the same thread using the
   * {@link org.fourthline.cling.controlpoint.ActionCallback.Default} implementation:
   * </p>
   * <pre>
   * myActionInvocation.setInput("foo", bar);
   * new ActionCallback.Default(myActionInvocation, upnpService.getControlPoint()).run();
   * myActionInvocation.getOutput("baz");
   * </pre>
   *
   * @author Christian Bauer
   */
  public abstract class ActionCallback implements Runnable {
  
      /**
       * Empty implementation of callback methods, simplifies synchronous
       * execution of an {@link org.fourthline.cling.model.action.ActionInvocation}.
       */
      public static final class Default extends ActionCallback {
  
          public Default(ActionInvocation actionInvocation, ControlPoint controlPoint) {
              super(actionInvocation, controlPoint);
          }
  
          @Override
          public void success(ActionInvocation invocation) {
          }
  
          @Override
          public void failure(ActionInvocation invocation, UpnpResponse operation, String defaultMsg) {
  
          }
      }
  
      protected final ActionInvocation actionInvocation;
  
      protected ControlPoint controlPoint;
  
      protected ActionCallback(ActionInvocation actionInvocation, ControlPoint controlPoint) {
          this.actionInvocation = actionInvocation;
          this.controlPoint = controlPoint;
      }
  
      protected ActionCallback(ActionInvocation actionInvocation) {
          this.actionInvocation = actionInvocation;
     }
 
     public ActionInvocation getActionInvocation() {
         return actionInvocation;
     }
 
     synchronized public ControlPoint getControlPoint() {
         return controlPoint;
     }
 
     synchronized public ActionCallback setControlPoint(ControlPoint controlPoint) {
         this.controlPoint = controlPoint;
         return this;
     }
 
     public void run() {
         Service service = actionInvocation.getAction().getService();
 
         // Local execution
         if (service instanceof LocalService) {
             LocalService localService = (LocalService)service;
 
             // Executor validates input inside the execute() call immediately
             localService.getExecutor(actionInvocation.getAction()).execute(actionInvocation);
 
             if (actionInvocation.getFailure() != null) {
                 failure(actionInvocation, null);
             } else {
                 success(actionInvocation);
             }
 
         // Remote execution
         } else if (service instanceof RemoteService){
 
             if (getControlPoint()  == null) {
                 throw new IllegalStateException("Callback must be executed through ControlPoint");
             }
 
             RemoteService remoteService = (RemoteService)service;
 
             // Figure out the remote URL where we'd like to send the action request to
             URL controLURL;
             try {
             	controLURL = remoteService.getDevice().normalizeURI(remoteService.getControlURI());
             } catch(IllegalArgumentException e) {
             	failure(actionInvocation, null, "bad control URL: " + remoteService.getControlURI());
             	return ;
             }
 
             // Do it
             SendingAction prot = getControlPoint().getProtocolFactory().createSendingAction(actionInvocation, controLURL);
             prot.run();
 
             IncomingActionResponseMessage response = prot.getOutputMessage();
 
             if (response == null) {
                 failure(actionInvocation, null);
             } else if (response.getOperation().isFailed()) {
                 failure(actionInvocation, response.getOperation());
             } else {
                 success(actionInvocation);
             }
         }
     }
 
     protected String createDefaultFailureMessage(ActionInvocation invocation, UpnpResponse operation) {
         String message = "Error: ";
         final ActionException exception = invocation.getFailure();
         if (exception != null) {
             message = message + exception.getMessage();
         }
         if (operation != null) {
             message = message + " (HTTP response was: " + operation.getResponseDetails() + ")";
         }
         return message;
     }
 
     protected void failure(ActionInvocation invocation, UpnpResponse operation) {
         failure(invocation, operation, createDefaultFailureMessage(invocation, operation));
     }
 
     /**
      * Called when the action invocation succeeded.
      *
      * @param invocation The successful invocation, call its <code>getOutput()</code> method for results.
      */
     public abstract void success(ActionInvocation invocation);
 
     /**
      * Called when the action invocation failed.
      *
      * @param invocation The failed invocation, call its <code>getFailure()</code> method for more details.
      * @param operation If the invocation was on a remote service, the response message, otherwise null.
      * @param defaultMsg A user-friendly error message generated from the invocation exception and response.
      * @see #createDefaultFailureMessage
      */
     public abstract void failure(ActionInvocation invocation, UpnpResponse operation, String defaultMsg);
 
     @Override
     public String toString() {
         return "(ActionCallback) " + actionInvocation;
     }
 }