<?php

/*
 * This file is part of the symfony package.
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * sfWebDebugLogger logs messages into the web debug toolbar.
 *
 * @package    symfony
 * @subpackage log
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @version    SVN: $Id$
 */
class sfWebDebugLogger extends sfVarLogger
{
  /** @var sfContext */
  protected $context       = null;
  /** @var string */
  protected $webDebugClass = null;
  /** @var sfWebDebug */
  protected $webDebug      = null;

  /**
   * Initializes this logger.
   *
   * Available options:
   *
   *  * web_debug_class: The web debug class (sfWebDebug by default)
   *
   * @param  sfEventDispatcher $dispatcher  A sfEventDispatcher instance
   * @param  array             $options     An array of options.
   *
   * @return void
   *
   * @see sfVarLogger
   */
  public function initialize(sfEventDispatcher $dispatcher, $options = array())
  {
    $this->context = sfContext::getInstance();

    $this->webDebugClass = isset($options['web_debug_class']) ? $options['web_debug_class'] : 'sfWebDebug';

    if (sfConfig::get('sf_web_debug'))
    {
      $dispatcher->connect('context.load_factories', array($this, 'listenForLoadFactories'));
      $dispatcher->connect('response.filter_content', array($this, 'filterResponseContent'));
    }

    $this->registerErrorHandler();

    parent::initialize($dispatcher, $options);
  }

  /**
   * Registers logger with PHP error handler.
   */
  protected function registerErrorHandler()
  {
    set_error_handler(array($this,'handlePhpError'));
  }

  /**
   * PHP error handler send PHP errors to log.
   *
   * PHP user space error handler can not handle E_ERROR, E_PARSE,
   * E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING,
   * and most of E_STRICT.
   *
   * @param string $errno      The level of the error raised, as an integer.
   * @param string $errstr     The error message, as a string.
   * @param string $errfile    The filename that the error was raised in, as a string.
   * @param string $errline    The line number the error was raised at, as an integer.
   * @param array  $errcontext An array that points to the active symbol table at the point the error occurred.
   *
   * @return bool
   */
  public function handlePhpError($errno, $errstr, $errfile, $errline, $errcontext = array())
  {
    if (($errno & error_reporting()) == 0)
    {
      return false;
    }

    $message = sprintf(' %%s at %s on line %s (%s)', $errfile, $errline, str_replace('%', '%%', $errstr));
    switch ($errno)
    {
      case E_STRICT:
        $this->dispatcher->notify(new sfEvent($this, 'application.log', array('priority' => sfLogger::ERR, sprintf($message, 'Strict notice'))));
        break;
      case E_NOTICE:
        $this->dispatcher->notify(new sfEvent($this, 'application.log', array('priority' => sfLogger::NOTICE, sprintf($message, 'Notice'))));
        break;
      case E_WARNING:
        $this->dispatcher->notify(new sfEvent($this, 'application.log', array('priority' => sfLogger::WARNING, sprintf($message, 'Warning'))));
        break;
      case E_RECOVERABLE_ERROR:
        $this->dispatcher->notify(new sfEvent($this, 'application.log', array('priority' => sfLogger::ERR, sprintf($message, 'Error'))));
        break;
    }

    return false; // do not prevent default error handling
  }

  /**
   * Listens for the context.load_factories event.
   *
   * @param sfEvent $event
   */
  public function listenForLoadFactories(sfEvent $event)
  {
    $path = sprintf('%s/%s/images', $event->getSubject()->getRequest()->getRelativeUrlRoot(), sfConfig::get('sf_web_debug_web_dir'));
    $path = str_replace('//', '/', $path);

    $this->webDebug = new $this->webDebugClass($this->dispatcher, $this, array(
      'image_root_path'    => $path,
      'request_parameters' => $event->getSubject()->getRequest()->getParameterHolder()->getAll(),
    ));
  }

  /**
   * Listens to the response.filter_content event.
   *
   * @param  sfEvent $event   The sfEvent instance
   * @param  string  $content The response content
   *
   * @return string  The filtered response content
   */
  public function filterResponseContent(sfEvent $event, $content)
  {
    if (!sfConfig::get('sf_web_debug'))
    {
      return $content;
    }

    // log timers information
    $messages = array();
    foreach (sfTimerManager::getTimers() as $name => $timer)
    {
      $messages[] = sprintf('%s %.2f ms (%d)', $name, $timer->getElapsedTime() * 1000, $timer->getCalls());
    }
    $this->dispatcher->notify(new sfEvent($this, 'application.log', $messages));

    // don't add debug toolbar:
    // * for XHR requests
    // * if response status code is in the 3xx range
    // * if not rendering to the client
    // * if HTTP headers only
    $response = $event->getSubject();
    /** @var sfWebRequest $request */
    $request  = $this->context->getRequest();
    if (
      null === $this->webDebug
      ||
      !$this->context->has('request')
      ||
      !$this->context->has('response')
      ||
      !$this->context->has('controller')
      ||
      $request->isXmlHttpRequest()
      ||
      strpos($response->getContentType(), 'html') === false
      ||
      '3' == substr($response->getStatusCode(), 0, 1)
      ||
      $this->context->getController()->getRenderMode() != sfView::RENDER_CLIENT
      ||
      $response->isHeaderOnly()
    )
    {
      return $content;
    }

    return $this->webDebug->injectToolbar($content);
  }
}
