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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  System.Debug
 *
 * @copyright   Copyright (C) 2005 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\Utilities\ArrayHelper;

/**
 * Joomla! Debug plugin.
 *
 * @since  1.5
 */
class PlgSystemDebug extends JPlugin
{
	/**
	 * xdebug.file_link_format from the php.ini.
	 *
	 * @var    string
	 * @since  1.7
	 */
	protected $linkFormat = '';

	/**
	 * True if debug lang is on.
	 *
	 * @var    boolean
	 * @since  3.0
	 */
	private $debugLang = false;

	/**
	 * Holds log entries handled by the plugin.
	 *
	 * @var    array
	 * @since  3.1
	 */
	private $logEntries = array();

	/**
	 * Holds SHOW PROFILES of queries.
	 *
	 * @var    array
	 * @since  3.1.2
	 */
	private $sqlShowProfiles = array();

	/**
	 * Holds all SHOW PROFILE FOR QUERY n, indexed by n-1.
	 *
	 * @var    array
	 * @since  3.1.2
	 */
	private $sqlShowProfileEach = array();

	/**
	 * Holds all EXPLAIN EXTENDED for all queries.
	 *
	 * @var    array
	 * @since  3.1.2
	 */
	private $explains = array();

	/**
	 * Holds total amount of executed queries.
	 *
	 * @var    int
	 * @since  3.2
	 */
	private $totalQueries = 0;

	/**
	 * Application object.
	 *
	 * @var    JApplicationCms
	 * @since  3.3
	 */
	protected $app;

	/**
	 * Database object.
	 *
	 * @var    JDatabaseDriver
	 * @since  3.8.0
	 */
	protected $db;

	/**
	 * Container for callback functions to be triggered when rendering the console.
	 *
	 * @var    callable[]
	 * @since  3.7.0
	 */
	private static $displayCallbacks = array();

	/**
	 * Constructor.
	 *
	 * @param   object  &$subject  The object to observe.
	 * @param   array   $config    An optional associative array of configuration settings.
	 *
	 * @since   1.5
	 */
	public function __construct(&$subject, $config)
	{
		parent::__construct($subject, $config);

		// Log the deprecated API.
		if ($this->params->get('log-deprecated', 0))
		{
			JLog::addLogger(array('text_file' => 'deprecated.php'), JLog::ALL, array('deprecated'));
		}

		// Log everything (except deprecated APIs, these are logged separately with the option above).
		if ($this->params->get('log-everything', 0))
		{
			JLog::addLogger(array('text_file' => 'everything.php'), JLog::ALL, array('deprecated', 'databasequery'), true);
		}

		// Get the application if not done by JPlugin. This may happen during upgrades from Joomla 2.5.
		if (!$this->app)
		{
			$this->app = JFactory::getApplication();
		}

		// Get the db if not done by JPlugin. This may happen during upgrades from Joomla 2.5.
		if (!$this->db)
		{
			$this->db = JFactory::getDbo();
		}

		$this->debugLang = $this->app->get('debug_lang');

		// Skip the plugin if debug is off
		if ($this->debugLang == '0' && $this->app->get('debug') == '0')
		{
			return;
		}

		// Only if debugging or language debug is enabled.
		if (JDEBUG || $this->debugLang)
		{
			JFactory::getConfig()->set('gzip', 0);
			ob_start();
			ob_implicit_flush(false);
		}

		$this->linkFormat = ini_get('xdebug.file_link_format');

		if ($this->params->get('logs', 1))
		{
			$priority = 0;

			foreach ($this->params->get('log_priorities', array()) as $p)
			{
				$const = 'JLog::' . strtoupper($p);

				if (!defined($const))
				{
					continue;
				}

				$priority |= constant($const);
			}

			// Split into an array at any character other than alphabet, numbers, _, ., or -
			$categories = array_filter(preg_split('/[^A-Z0-9_\.-]/i', $this->params->get('log_categories', '')));
			$mode       = $this->params->get('log_category_mode', 0);

			JLog::addLogger(array('logger' => 'callback', 'callback' => array($this, 'logger')), $priority, $categories, $mode);
		}

		// Prepare disconnect handler for SQL profiling.
		$db = $this->db;
		$db->addDisconnectHandler(array($this, 'mysqlDisconnectHandler'));

		// Log deprecated class aliases
		foreach (JLoader::getDeprecatedAliases() as $deprecation)
		{
			JLog::add(
				sprintf(
					'%1$s has been aliased to %2$s and the former class name is deprecated. The alias will be removed in %3$s.',
					$deprecation['old'],
					$deprecation['new'],
					$deprecation['version']
				),
				JLog::WARNING,
				'deprecated'
			);
		}
	}

	/**
	 * Add the CSS for debug.
	 * We can't do this in the constructor because stuff breaks.
	 *
	 * @return  void
	 *
	 * @since   2.5
	 */
	public function onAfterDispatch()
	{
		// Only if debugging or language debug is enabled.
		if ((JDEBUG || $this->debugLang) && $this->isAuthorisedDisplayDebug())
		{
			JHtml::_('stylesheet', 'cms/debug.css', array('version' => 'auto', 'relative' => true));
		}

		// Disable asset media version if needed.
		if (JDEBUG && (int) $this->params->get('refresh_assets', 1) === 0)
		{
			$this->app->getDocument()->setMediaVersion(null);
		}

		// Only if debugging is enabled for SQL query popovers.
		if (JDEBUG && $this->isAuthorisedDisplayDebug())
		{
			JHtml::_('bootstrap.tooltip');
			JHtml::_('bootstrap.popover', '.hasPopover', array('placement' => 'top'));
		}
	}

	/**
	 * Show the debug info.
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	public function onAfterRespond()
	{
		// Do not render if debugging or language debug is not enabled.
		if (!JDEBUG && !$this->debugLang)
		{
			return;
		}

		// User has to be authorised to see the debug information.
		if (!$this->isAuthorisedDisplayDebug())
		{
			return;
		}

		// Only render for HTML output.
		if (JFactory::getDocument()->getType() !== 'html')
		{
			return;
		}

		// Capture output.
		$contents = ob_get_contents();

		if ($contents)
		{
			ob_end_clean();
		}

		// No debug for Safari and Chrome redirection.
		if (strpos($contents, '<html><head><meta http-equiv="refresh" content="0;') === 0
			&& strpos(strtolower(isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : ''), 'webkit') !== false)
		{
			echo $contents;

			return;
		}

		// Load language.
		$this->loadLanguage();

		$html = array();

		// Some "mousewheel protecting" JS.
		$html[] = "<script>function toggleContainer(name)
		{
			var e = document.getElementById(name);// MooTools might not be available ;)
			e.style.display = e.style.display === 'none' ? 'block' : 'none';
		}</script>";

		$html[] = '<div id="system-debug" class="profiler">';

		$html[] = '<h2>' . JText::_('PLG_DEBUG_TITLE') . '</h2>';

		if (JDEBUG)
		{
			if (JError::getErrors())
			{
				$html[] = $this->display('errors');
			}

			if ($this->params->get('session', 1))
			{
				$html[] = $this->display('session');
			}

			if ($this->params->get('profile', 1))
			{
				$html[] = $this->display('profile_information');
			}

			if ($this->params->get('memory', 1))
			{
				$html[] = $this->display('memory_usage');
			}

			if ($this->params->get('queries', 1))
			{
				$html[] = $this->display('queries');
			}

			if (!empty($this->logEntries) && $this->params->get('logs', 1))
			{
				$html[] = $this->display('logs');
			}
		}

		if ($this->debugLang)
		{
			if ($this->params->get('language_errorfiles', 1))
			{
				$languageErrors = JFactory::getLanguage()->getErrorFiles();
				$html[]         = $this->display('language_files_in_error', $languageErrors);
			}

			if ($this->params->get('language_files', 1))
			{
				$html[] = $this->display('language_files_loaded');
			}

			if ($this->params->get('language_strings', 1))
			{
				$html[] = $this->display('untranslated_strings');
			}
		}

		foreach (self::$displayCallbacks as $name => $callable)
		{
			$html[] = $this->displayCallback($name, $callable);
		}

		$html[] = '</div>';

		echo str_replace('</body>', implode('', $html) . '</body>', $contents);
	}

	/**
	 * Add a display callback to be rendered with the debug console.
	 *
	 * @param   string    $name      The name of the callable, this is used to generate the section title.
	 * @param   callable  $callable  The callback function to be added.
	 *
	 * @return  boolean
	 *
	 * @since   3.7.0
	 * @throws  InvalidArgumentException
	 */
	public static function addDisplayCallback($name, $callable)
	{
		// TODO - When PHP 5.4 is the minimum the parameter should be typehinted "callable" and this check removed
		if (!is_callable($callable))
		{
			throw new InvalidArgumentException('A valid callback function must be given.');
		}

		self::$displayCallbacks[$name] = $callable;

		return true;
	}

	/**
	 * Remove a registered display callback
	 *
	 * @param   string  $name  The name of the callable.
	 *
	 * @return  boolean
	 *
	 * @since   3.7.0
	 */
	public static function removeDisplayCallback($name)
	{
		unset(self::$displayCallbacks[$name]);

		return true;
	}

	/**
	 * Method to check if the current user is allowed to see the debug information or not.
	 *
	 * @return  boolean  True if access is allowed.
	 *
	 * @since   3.0
	 */
	private function isAuthorisedDisplayDebug()
	{
		static $result = null;

		if ($result !== null)
		{
			return $result;
		}

		// If the user is not allowed to view the output then end here.
		$filterGroups = (array) $this->params->get('filter_groups', array());

		if (!empty($filterGroups))
		{
			$userGroups = JFactory::getUser()->get('groups');

			if (!array_intersect($filterGroups, $userGroups))
			{
				$result = false;

				return false;
			}
		}

		$result = true;

		return true;
	}

	/**
	 * General display method.
	 *
	 * @param   string  $item    The item to display.
	 * @param   array   $errors  Errors occurred during execution.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function display($item, array $errors = array())
	{
		$title = JText::_('PLG_DEBUG_' . strtoupper($item));

		$status = '';

		if (count($errors))
		{
			$status = ' dbg-error';
		}

		$fncName = 'display' . ucfirst(str_replace('_', '', $item));

		if (!method_exists($this, $fncName))
		{
			return __METHOD__ . ' -- Unknown method: ' . $fncName . '<br />';
		}

		$html = array();

		$js = "toggleContainer('dbg_container_" . $item . "');";

		$class = 'dbg-header' . $status;

		$html[] = '<div class="' . $class . '" onclick="' . $js . '"><a href="javascript:void(0);"><h3>' . $title . '</h3></a></div>';

		// @todo set with js.. ?
		$style = ' style="display: none;"';

		$html[] = '<div ' . $style . ' class="dbg-container" id="dbg_container_' . $item . '">';
		$html[] = $this->$fncName();
		$html[] = '</div>';

		return implode('', $html);
	}

	/**
	 * Display method for callback functions.
	 *
	 * @param   string    $name      The name of the callable.
	 * @param   callable  $callable  The callable function.
	 *
	 * @return  string
	 *
	 * @since   3.7.0
	 */
	protected function displayCallback($name, $callable)
	{
		$title = JText::_('PLG_DEBUG_' . strtoupper($name));

		$html = array();

		$js = "toggleContainer('dbg_container_" . $name . "');";

		$class = 'dbg-header';

		$html[] = '<div class="' . $class . '" onclick="' . $js . '"><a href="javascript:void(0);"><h3>' . $title . '</h3></a></div>';

		// @todo set with js.. ?
		$style = ' style="display: none;"';

		$html[] = '<div ' . $style . ' class="dbg-container" id="dbg_container_' . $name . '">';
		$html[] = call_user_func($callable);
		$html[] = '</div>';

		return implode('', $html);
	}

	/**
	 * Display session information.
	 *
	 * Called recursively.
	 *
	 * @param   string   $key      A session key.
	 * @param   mixed    $session  The session array, initially null.
	 * @param   integer  $id       Used to identify the DIV for the JavaScript toggling code.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displaySession($key = '', $session = null, $id = 0)
	{
		if (!$session)
		{
			$session = JFactory::getSession()->getData();
		}

		$html = array();
		static $id;

		if (!is_array($session))
		{
			$html[] = $key . '<pre>' . $this->prettyPrintJSON($session) . '</pre>' . PHP_EOL;
		}
		else
		{
			foreach ($session as $sKey => $entries)
			{
				$display = true;

				if (is_array($entries) && $entries)
				{
					$display = false;
				}

				if (is_object($entries))
				{
					$o = ArrayHelper::fromObject($entries);

					if ($o)
					{
						$entries = $o;
						$display = false;
					}
				}

				if (!$display)
				{
					$js = "toggleContainer('dbg_container_session" . $id . '_' . $sKey . "');";

					$html[] = '<div class="dbg-header" onclick="' . $js . '"><a href="javascript:void(0);"><h3>' . $sKey . '</h3></a></div>';

					// @todo set with js.. ?
					$style = ' style="display: none;"';

					$html[] = '<div ' . $style . ' class="dbg-container" id="dbg_container_session' . $id . '_' . $sKey . '">';
					$id++;

					// Recurse...
					$this->displaySession($sKey, $entries, $id);

					$html[] = '</div>';

					continue;
				}

				if (is_array($entries))
				{
					$entries = implode($entries);
				}

				if (is_string($entries))
				{
					$html[] = $sKey . '<pre>' . $this->prettyPrintJSON($entries) . '</pre>' . PHP_EOL;
				}
			}
		}

		return implode('', $html);
	}

	/**
	 * Display errors.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displayErrors()
	{
		$html = array();

		$html[] = '<ol>';

		while ($error = JError::getError(true))
		{
			$col = (E_WARNING == $error->get('level')) ? 'red' : 'orange';

			$html[] = '<li>';
			$html[] = '<b style="color: ' . $col . '">' . $error->getMessage() . '</b><br />';

			$info = $error->get('info');

			if ($info)
			{
				$html[] = '<pre>' . print_r($info, true) . '</pre><br />';
			}

			$html[] = $this->renderBacktrace($error);
			$html[] = '</li>';
		}

		$html[] = '</ol>';

		return implode('', $html);
	}

	/**
	 * Display profile information.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displayProfileInformation()
	{
		$html = array();

		$htmlMarks = array();

		$totalTime = 0;
		$totalMem  = 0;
		$marks     = array();

		foreach (JProfiler::getInstance('Application')->getMarks() as $mark)
		{
			$totalTime += $mark->time;
			$totalMem  += (float) $mark->memory;
			$htmlMark  = sprintf(
				JText::_('PLG_DEBUG_TIME') . ': <span class="label label-time">%.2f&nbsp;ms</span> / <span class="label label-default">%.2f&nbsp;ms</span>'
				. ' ' . JText::_('PLG_DEBUG_MEMORY') . ': <span class="label label-memory">%0.3f MB</span> / <span class="label label-default">%0.2f MB</span>'
				. ' %s: %s',
				$mark->time,
				$mark->totalTime,
				$mark->memory,
				$mark->totalMemory,
				$mark->prefix,
				$mark->label
			);

			$marks[] = (object) array(
				'time'   => $mark->time,
				'memory' => $mark->memory,
				'html'   => $htmlMark,
				'tip'    => $mark->label,
			);
		}

		$avgTime = $totalTime / count($marks);
		$avgMem  = $totalMem / count($marks);

		foreach ($marks as $mark)
		{
			if ($mark->time > $avgTime * 1.5)
			{
				$barClass   = 'bar-danger';
				$labelClass = 'label-important label-danger';
			}
			elseif ($mark->time < $avgTime / 1.5)
			{
				$barClass   = 'bar-success';
				$labelClass = 'label-success';
			}
			else
			{
				$barClass   = 'bar-warning';
				$labelClass = 'label-warning';
			}

			if ($mark->memory > $avgMem * 1.5)
			{
				$barClassMem   = 'bar-danger';
				$labelClassMem = 'label-important label-danger';
			}
			elseif ($mark->memory < $avgMem / 1.5)
			{
				$barClassMem   = 'bar-success';
				$labelClassMem = 'label-success';
			}
			else
			{
				$barClassMem   = 'bar-warning';
				$labelClassMem = 'label-warning';
			}

			$barClass    .= " progress-$barClass";
			$barClassMem .= " progress-$barClassMem";

			$bars[] = (object) array(
				'width' => round($mark->time / ($totalTime / 100), 4),
				'class' => $barClass,
				'tip'   => $mark->tip . ' ' . round($mark->time, 2) . ' ms',
			);

			$barsMem[] = (object) array(
				'width' => round((float) $mark->memory / ($totalMem / 100), 4),
				'class' => $barClassMem,
				'tip'   => $mark->tip . ' ' . round($mark->memory, 3) . '  MB',
			);

			$htmlMarks[] = '<div>' . str_replace('label-time', $labelClass, str_replace('label-memory', $labelClassMem, $mark->html)) . '</div>';
		}

		$html[] = '<h4>' . JText::_('PLG_DEBUG_TIME') . '</h4>';
		$html[] = $this->renderBars($bars, 'profile');
		$html[] = '<h4>' . JText::_('PLG_DEBUG_MEMORY') . '</h4>';
		$html[] = $this->renderBars($barsMem, 'profile');

		$html[] = '<div class="dbg-profile-list">' . implode('', $htmlMarks) . '</div>';

		$db = $this->db;

		//  fix  for support custom shutdown function via register_shutdown_function().
		$db->disconnect();

		$log = $db->getLog();

		if ($log)
		{
			$timings = $db->getTimings();

			if ($timings)
			{
				$totalQueryTime = 0.0;
				$lastStart      = null;

				foreach ($timings as $k => $v)
				{
					if (!($k % 2))
					{
						$lastStart = $v;
					}
					else
					{
						$totalQueryTime += $v - $lastStart;
					}
				}

				$totalQueryTime *= 1000;

				if ($totalQueryTime > ($totalTime * 0.25))
				{
					$labelClass = 'label-important';
				}
				elseif ($totalQueryTime < ($totalTime * 0.15))
				{
					$labelClass = 'label-success';
				}
				else
				{
					$labelClass = 'label-warning';
				}

				$html[] = '<br /><div>' . JText::sprintf(
						'PLG_DEBUG_QUERIES_TIME',
						sprintf('<span class="label ' . $labelClass . '">%.2f&nbsp;ms</span>', $totalQueryTime)
					) . '</div>';

				if ($this->params->get('log-executed-sql', 0))
				{
					$this->writeToFile();
				}
			}
		}

		return implode('', $html);
	}

	/**
	 * Display memory usage.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displayMemoryUsage()
	{
		$bytes = memory_get_usage();

		return '<span class="label label-default">' . JHtml::_('number.bytes', $bytes) . '</span>'
			. ' (<span class="label label-default">'
			. number_format($bytes, 0, JText::_('DECIMALS_SEPARATOR'), JText::_('THOUSANDS_SEPARATOR'))
			. ' '
			. JText::_('PLG_DEBUG_BYTES')
			. '</span>)';
	}

	/**
	 * Display logged queries.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displayQueries()
	{
		$db  = $this->db;
		$log = $db->getLog();

		if (!$log)
		{
			return null;
		}

		$timings    = $db->getTimings();
		$callStacks = $db->getCallStacks();

		$db->setDebug(false);

		$selectQueryTypeTicker = array();
		$otherQueryTypeTicker  = array();

		$timing  = array();
		$maxtime = 0;

		if (isset($timings[0]))
		{
			$startTime         = $timings[0];
			$endTime           = $timings[count($timings) - 1];
			$totalBargraphTime = $endTime - $startTime;

			if ($totalBargraphTime > 0)
			{
				foreach ($log as $id => $query)
				{
					if (isset($timings[$id * 2 + 1]))
					{
						// Compute the query time: $timing[$k] = array( queryTime, timeBetweenQueries ).
						$timing[$id] = array(
							($timings[$id * 2 + 1] - $timings[$id * 2]) * 1000,
							$id > 0 ? ($timings[$id * 2] - $timings[$id * 2 - 1]) * 1000 : 0,
						);
						$maxtime     = max($maxtime, $timing[$id]['0']);
					}
				}
			}
		}
		else
		{
			$startTime         = null;
			$totalBargraphTime = 1;
		}

		$bars           = array();
		$info           = array();
		$totalQueryTime = 0;
		$duplicates     = array();

		foreach ($log as $id => $query)
		{
			$did = md5($query);

			if (!isset($duplicates[$did]))
			{
				$duplicates[$did] = array();
			}

			$duplicates[$did][] = $id;

			if ($timings && isset($timings[$id * 2 + 1]))
			{
				// Compute the query time.
				$queryTime      = ($timings[$id * 2 + 1] - $timings[$id * 2]) * 1000;
				$totalQueryTime += $queryTime;

				// Run an EXPLAIN EXTENDED query on the SQL query if possible.
				$hasWarnings          = false;
				$hasWarningsInProfile = false;

				if (isset($this->explains[$id]))
				{
					$explain = $this->tableToHtml($this->explains[$id], $hasWarnings);
				}
				else
				{
					$explain = JText::sprintf('PLG_DEBUG_QUERY_EXPLAIN_NOT_POSSIBLE', htmlspecialchars($query));
				}

				// Run a SHOW PROFILE query.
				$profile = '';

				if (isset($this->sqlShowProfileEach[$id]) && $db->getServerType() === 'mysql')
				{
					$profileTable = $this->sqlShowProfileEach[$id];
					$profile      = $this->tableToHtml($profileTable, $hasWarningsInProfile);
				}

				// How heavy should the string length count: 0 - 1.
				$ratio     = 0.5;
				$timeScore = $queryTime / ((strlen($query) + 1) * $ratio) * 200;

				// Determine color of bargraph depending on query speed and presence of warnings in EXPLAIN.
				if ($timeScore > 10)
				{
					$barClass   = 'bar-danger';
					$labelClass = 'label-important';
				}
				elseif ($hasWarnings || $timeScore > 5)
				{
					$barClass   = 'bar-warning';
					$labelClass = 'label-warning';
				}
				else
				{
					$barClass   = 'bar-success';
					$labelClass = 'label-success';
				}

				// Computes bargraph as follows: Position begin and end of the bar relatively to whole execution time.
				// TODO: $prevBar is not used anywhere. Remove?
				$prevBar = $id && isset($bars[$id - 1]) ? $bars[$id - 1] : 0;

				$barPre   = round($timing[$id][1] / ($totalBargraphTime * 10), 4);
				$barWidth = round($timing[$id][0] / ($totalBargraphTime * 10), 4);
				$minWidth = 0.3;

				if ($barWidth < $minWidth)
				{
					$barPre -= ($minWidth - $barWidth);

					if ($barPre < 0)
					{
						$minWidth += $barPre;
						$barPre   = 0;
					}

					$barWidth = $minWidth;
				}

				$bars[$id] = (object) array(
					'class' => $barClass,
					'width' => $barWidth,
					'pre'   => $barPre,
					'tip'   => sprintf('%.2f&nbsp;ms', $queryTime),
				);
				$info[$id] = (object) array(
					'class'       => $labelClass,
					'explain'     => $explain,
					'profile'     => $profile,
					'hasWarnings' => $hasWarnings,
				);
			}
		}

		// Remove single queries from $duplicates.
		$total_duplicates = 0;

		foreach ($duplicates as $did => $dups)
		{
			if (count($dups) < 2)
			{
				unset($duplicates[$did]);
			}
			else
			{
				$total_duplicates += count($dups);
			}
		}

		// Fix first bar width.
		$minWidth = 0.3;

		if ($bars[0]->width < $minWidth && isset($bars[1]))
		{
			$bars[1]->pre -= ($minWidth - $bars[0]->width);

			if ($bars[1]->pre < 0)
			{
				$minWidth     += $bars[1]->pre;
				$bars[1]->pre = 0;
			}

			$bars[0]->width = $minWidth;
		}

		$memoryUsageNow = memory_get_usage();
		$list           = array();

		foreach ($log as $id => $query)
		{
			// Start query type ticker additions.
			$fromStart  = stripos($query, 'from');
			$whereStart = stripos($query, 'where', $fromStart);

			if ($whereStart === false)
			{
				$whereStart = stripos($query, 'order by', $fromStart);
			}

			if ($whereStart === false)
			{
				$whereStart = strlen($query) - 1;
			}

			$fromString = substr($query, 0, $whereStart);
			$fromString = str_replace(array("\t", "\n"), ' ', $fromString);
			$fromString = trim($fromString);

			// Initialise the select/other query type counts the first time.
			if (!isset($selectQueryTypeTicker[$fromString]))
			{
				$selectQueryTypeTicker[$fromString] = 0;
			}

			if (!isset($otherQueryTypeTicker[$fromString]))
			{
				$otherQueryTypeTicker[$fromString] = 0;
			}

			// Increment the count.
			if (stripos($query, 'select') === 0)
			{
				$selectQueryTypeTicker[$fromString]++;
				unset($otherQueryTypeTicker[$fromString]);
			}
			else
			{
				$otherQueryTypeTicker[$fromString]++;
				unset($selectQueryTypeTicker[$fromString]);
			}

			$text = $this->highlightQuery($query);

			if ($timings && isset($timings[$id * 2 + 1]))
			{
				// Compute the query time.
				$queryTime = ($timings[$id * 2 + 1] - $timings[$id * 2]) * 1000;

				// Timing
				// Formats the output for the query time with EXPLAIN query results as tooltip:
				$htmlTiming = '<div style="margin: 0 0 5px;"><span class="dbg-query-time">';
				$htmlTiming .= JText::sprintf(
					'PLG_DEBUG_QUERY_TIME',
					sprintf(
						'<span class="label %s">%.2f&nbsp;ms</span>',
						$info[$id]->class,
						$timing[$id]['0']
					)
				);

				if ($timing[$id]['1'])
				{
					$htmlTiming .= ' ' . JText::sprintf(
							'PLG_DEBUG_QUERY_AFTER_LAST',
							sprintf('<span class="label label-default">%.2f&nbsp;ms</span>', $timing[$id]['1'])
						);
				}

				$htmlTiming .= '</span>';

				if (isset($callStacks[$id][0]['memory']))
				{
					$memoryUsed        = $callStacks[$id][0]['memory'][1] - $callStacks[$id][0]['memory'][0];
					$memoryBeforeQuery = $callStacks[$id][0]['memory'][0];

					// Determine colour of query memory usage.
					if ($memoryUsed > 0.1 * $memoryUsageNow)
					{
						$labelClass = 'label-important';
					}
					elseif ($memoryUsed > 0.05 * $memoryUsageNow)
					{
						$labelClass = 'label-warning';
					}
					else
					{
						$labelClass = 'label-success';
					}

					$htmlTiming .= ' ' . '<span class="dbg-query-memory">'
						. JText::sprintf(
							'PLG_DEBUG_MEMORY_USED_FOR_QUERY',
							sprintf('<span class="label ' . $labelClass . '">%.3f&nbsp;MB</span>', $memoryUsed / 1048576),
							sprintf('<span class="label label-default">%.3f&nbsp;MB</span>', $memoryBeforeQuery / 1048576)
						)
						. '</span>';

					if ($callStacks[$id][0]['memory'][2] !== null)
					{
						// Determine colour of number or results.
						$resultsReturned = $callStacks[$id][0]['memory'][2];

						if ($resultsReturned > 3000)
						{
							$labelClass = 'label-important';
						}
						elseif ($resultsReturned > 1000)
						{
							$labelClass = 'label-warning';
						}
						elseif ($resultsReturned == 0)
						{
							$labelClass = '';
						}
						else
						{
							$labelClass = 'label-success';
						}

						$htmlResultsReturned = '<span class="label ' . $labelClass . '">' . (int) $resultsReturned . '</span>';
						$htmlTiming          .= ' <span class="dbg-query-rowsnumber">'
							. JText::sprintf('PLG_DEBUG_ROWS_RETURNED_BY_QUERY', $htmlResultsReturned) . '</span>';
					}
				}

				$htmlTiming .= '</div>';

				// Bar.
				$htmlBar = $this->renderBars($bars, 'query', $id);

				// Profile query.
				$title = JText::_('PLG_DEBUG_PROFILE');

				if (!$info[$id]->profile)
				{
					$title = '<span class="dbg-noprofile">' . $title . '</span>';
				}

				$htmlProfile = $info[$id]->profile ?: JText::_('PLG_DEBUG_NO_PROFILE');

				$htmlAccordions = JHtml::_(
					'bootstrap.startAccordion', 'dbg_query_' . $id, array(
						'active' => $info[$id]->hasWarnings ? ('dbg_query_explain_' . $id) : '',
					)
				);

				$htmlAccordions .= JHtml::_('bootstrap.addSlide', 'dbg_query_' . $id, JText::_('PLG_DEBUG_EXPLAIN'), 'dbg_query_explain_' . $id)
					. $info[$id]->explain
					. JHtml::_('bootstrap.endSlide');

				$htmlAccordions .= JHtml::_('bootstrap.addSlide', 'dbg_query_' . $id, $title, 'dbg_query_profile_' . $id)
					. $htmlProfile
					. JHtml::_('bootstrap.endSlide');

				// Call stack and back trace.
				if (isset($callStacks[$id]))
				{
					$htmlAccordions .= JHtml::_('bootstrap.addSlide', 'dbg_query_' . $id, JText::_('PLG_DEBUG_CALL_STACK'), 'dbg_query_callstack_' . $id)
						. $this->renderCallStack($callStacks[$id])
						. JHtml::_('bootstrap.endSlide');
				}

				$htmlAccordions .= JHtml::_('bootstrap.endAccordion');

				$did = md5($query);

				if (isset($duplicates[$did]))
				{
					$dups = array();

					foreach ($duplicates[$did] as $dup)
					{
						if ($dup != $id)
						{
							$dups[] = '<a class="alert-link" href="#dbg-query-' . ($dup + 1) . '">#' . ($dup + 1) . '</a>';
						}
					}

					$htmlQuery = '<div class="alert alert-error">' . JText::_('PLG_DEBUG_QUERY_DUPLICATES') . ': ' . implode('&nbsp; ', $dups) . '</div>'
						. '<pre class="alert hasTooltip" title="' . JHtml::_('tooltipText', 'PLG_DEBUG_QUERY_DUPLICATES_FOUND') . '">' . $text . '</pre>';
				}
				else
				{
					$htmlQuery = '<pre>' . $text . '</pre>';
				}

				$list[] = '<a name="dbg-query-' . ($id + 1) . '"></a>'
					. $htmlTiming
					. $htmlBar
					. $htmlQuery
					. $htmlAccordions;
			}
			else
			{
				$list[] = '<pre>' . $text . '</pre>';
			}
		}

		$totalTime = 0;

		foreach (JProfiler::getInstance('Application')->getMarks() as $mark)
		{
			$totalTime += $mark->time;
		}

		if ($totalQueryTime > ($totalTime * 0.25))
		{
			$labelClass = 'label-important';
		}
		elseif ($totalQueryTime < ($totalTime * 0.15))
		{
			$labelClass = 'label-success';
		}
		else
		{
			$labelClass = 'label-warning';
		}

		if ($this->totalQueries === 0)
		{
			$this->totalQueries = $db->getCount();
		}

		$html = array();

		$html[] = '<h4>' . JText::sprintf('PLG_DEBUG_QUERIES_LOGGED', $this->totalQueries)
			. sprintf(' <span class="label ' . $labelClass . '">%.2f&nbsp;ms</span>', $totalQueryTime) . '</h4><br />';

		if ($total_duplicates)
		{
			$html[] = '<div class="alert alert-error">'
				. '<h4>' . JText::sprintf('PLG_DEBUG_QUERY_DUPLICATES_TOTAL_NUMBER', $total_duplicates) . '</h4>';

			foreach ($duplicates as $dups)
			{
				$links = array();

				foreach ($dups as $dup)
				{
					$links[] = '<a class="alert-link" href="#dbg-query-' . ($dup + 1) . '">#' . ($dup + 1) . '</a>';
				}

				$html[] = '<div>' . JText::sprintf('PLG_DEBUG_QUERY_DUPLICATES_NUMBER', count($links)) . ': ' . implode('&nbsp; ', $links) . '</div>';
			}

			$html[] = '</div>';
		}

		$html[] = '<ol><li>' . implode('<hr /></li><li>', $list) . '<hr /></li></ol>';

		if (!$this->params->get('query_types', 1))
		{
			return implode('', $html);
		}

		// Get the totals for the query types.
		$totalSelectQueryTypes = count($selectQueryTypeTicker);
		$totalOtherQueryTypes  = count($otherQueryTypeTicker);
		$totalQueryTypes       = $totalSelectQueryTypes + $totalOtherQueryTypes;

		$html[] = '<h4>' . JText::sprintf('PLG_DEBUG_QUERY_TYPES_LOGGED', $totalQueryTypes) . '</h4>';

		if ($totalSelectQueryTypes)
		{
			$html[] = '<h5>' . JText::_('PLG_DEBUG_SELECT_QUERIES') . '</h5>';

			arsort($selectQueryTypeTicker);

			$list = array();

			foreach ($selectQueryTypeTicker as $query => $occurrences)
			{
				$list[] = '<pre>'
					. JText::sprintf('PLG_DEBUG_QUERY_TYPE_AND_OCCURRENCES', $this->highlightQuery($query), $occurrences)
					. '</pre>';
			}

			$html[] = '<ol><li>' . implode('</li><li>', $list) . '</li></ol>';
		}

		if ($totalOtherQueryTypes)
		{
			$html[] = '<h5>' . JText::_('PLG_DEBUG_OTHER_QUERIES') . '</h5>';

			arsort($otherQueryTypeTicker);

			$list = array();

			foreach ($otherQueryTypeTicker as $query => $occurrences)
			{
				$list[] = '<pre>'
					. JText::sprintf('PLG_DEBUG_QUERY_TYPE_AND_OCCURRENCES', $this->highlightQuery($query), $occurrences)
					. '</pre>';
			}

			$html[] = '<ol><li>' . implode('</li><li>', $list) . '</li></ol>';
		}

		return implode('', $html);
	}

	/**
	 * Render the bars.
	 *
	 * @param   array    &$bars  Array of bar data
	 * @param   string   $class  Optional class for items
	 * @param   integer  $id     Id if the bar to highlight
	 *
	 * @return  string
	 *
	 * @since   3.1.2
	 */
	protected function renderBars(&$bars, $class = '', $id = null)
	{
		$html = array();

		foreach ($bars as $i => $bar)
		{
			if (isset($bar->pre) && $bar->pre)
			{
				$html[] = '<div class="dbg-bar-spacer" style="width:' . $bar->pre . '%;"></div>';
			}

			$barClass = trim('bar dbg-bar progress-bar ' . (isset($bar->class) ? $bar->class : ''));

			if ($id !== null && $i == $id)
			{
				$barClass .= ' dbg-bar-active';
			}

			$tip = '';

			if (isset($bar->tip) && $bar->tip)
			{
				$barClass .= ' hasTooltip';
				$tip      = JHtml::_('tooltipText', $bar->tip, '', 0);
			}

			$html[] = '<a class="bar dbg-bar ' . $barClass . '" title="' . $tip . '" style="width: '
				. $bar->width . '%;" href="#dbg-' . $class . '-' . ($i + 1) . '"></a>';
		}

		return '<div class="progress dbg-bars dbg-bars-' . $class . '">' . implode('', $html) . '</div>';
	}

	/**
	 * Render an HTML table based on a multi-dimensional array.
	 *
	 * @param   array    $table         An array of tabular data.
	 * @param   boolean  &$hasWarnings  Changes value to true if warnings are displayed, otherwise untouched
	 *
	 * @return  string
	 *
	 * @since   3.1.2
	 */
	protected function tableToHtml($table, &$hasWarnings)
	{
		if (!$table)
		{
			return null;
		}

		$html = array();

		$html[] = '<table class="table table-striped dbg-query-table">';
		$html[] = '<thead>';
		$html[] = '<tr>';

		foreach (array_keys($table[0]) as $k)
		{
			$html[] = '<th>' . htmlspecialchars($k) . '</th>';
		}

		$html[]    = '</tr>';
		$html[]    = '</thead>';
		$html[]    = '<tbody>';
		$durations = array();

		foreach ($table as $tr)
		{
			if (isset($tr['Duration']))
			{
				$durations[] = $tr['Duration'];
			}
		}

		rsort($durations, SORT_NUMERIC);

		foreach ($table as $tr)
		{
			$html[] = '<tr>';

			foreach ($tr as $k => $td)
			{
				if ($td === null)
				{
					// Display null's as 'NULL'.
					$td = 'NULL';
				}

				// Treat special columns.
				if ($k === 'Duration')
				{
					if ($td >= 0.001 && ($td == $durations[0] || (isset($durations[1]) && $td == $durations[1])))
					{
						// Duration column with duration value of more than 1 ms and within 2 top duration in SQL engine: Highlight warning.
						$html[]      = '<td class="dbg-warning">';
						$hasWarnings = true;
					}
					else
					{
						$html[] = '<td>';
					}

					// Display duration in milliseconds with the unit instead of seconds.
					$html[] = sprintf('%.2f&nbsp;ms', $td * 1000);
				}
				elseif ($k === 'Error')
				{
					// An error in the EXPLAIN query occurred, display it instead of the result (means original query had syntax error most probably).
					$html[]      = '<td class="dbg-warning">' . htmlspecialchars($td);
					$hasWarnings = true;
				}
				elseif ($k === 'key')
				{
					if ($td === 'NULL')
					{
						// Displays query parts which don't use a key with warning:
						$html[]      = '<td><strong>' . '<span class="dbg-warning hasTooltip" title="'
							. JHtml::_('tooltipText', 'PLG_DEBUG_WARNING_NO_INDEX_DESC') . '">'
							. JText::_('PLG_DEBUG_WARNING_NO_INDEX') . '</span>' . '</strong>';
						$hasWarnings = true;
					}
					else
					{
						$html[] = '<td><strong>' . htmlspecialchars($td) . '</strong>';
					}
				}
				elseif ($k === 'Extra')
				{
					$htmlTd = htmlspecialchars($td);

					// Replace spaces with &nbsp; (non-breaking spaces) for less tall tables displayed.
					$htmlTd = preg_replace('/([^;]) /', '\1&nbsp;', $htmlTd);

					// Displays warnings for "Using filesort":
					$htmlTdWithWarnings = str_replace(
						'Using&nbsp;filesort',
						'<span class="dbg-warning hasTooltip" title="'
						. JHtml::_('tooltipText', 'PLG_DEBUG_WARNING_USING_FILESORT_DESC') . '">'
						. JText::_('PLG_DEBUG_WARNING_USING_FILESORT') . '</span>',
						$htmlTd
					);

					if ($htmlTdWithWarnings !== $htmlTd)
					{
						$hasWarnings = true;
					}

					$html[] = '<td>' . $htmlTdWithWarnings;
				}
				else
				{
					$html[] = '<td>' . htmlspecialchars($td);
				}

				$html[] = '</td>';
			}

			$html[] = '</tr>';
		}

		$html[] = '</tbody>';
		$html[] = '</table>';

		return implode('', $html);
	}

	/**
	 * Disconnect handler for database to collect profiling and explain information.
	 *
	 * @param   JDatabaseDriver  &$db  Database object.
	 *
	 * @return  void
	 *
	 * @since   3.1.2
	 */
	public function mysqlDisconnectHandler(&$db)
	{
		$db->setDebug(false);

		$this->totalQueries = $db->getCount();

		$dbVersion5037 = $db->getServerType() === 'mysql' && version_compare($db->getVersion(), '5.0.37', '>=');

		if ($dbVersion5037)
		{
			try
			{
				// Check if profiling is enabled.
				$db->setQuery("SHOW VARIABLES LIKE 'have_profiling'");
				$hasProfiling = $db->loadResult();

				if ($hasProfiling)
				{
					// Run a SHOW PROFILE query.
					$db->setQuery('SHOW PROFILES');
					$this->sqlShowProfiles = $db->loadAssocList();

					if ($this->sqlShowProfiles)
					{
						foreach ($this->sqlShowProfiles as $qn)
						{
							// Run SHOW PROFILE FOR QUERY for each query where a profile is available (max 100).
							$db->setQuery('SHOW PROFILE FOR QUERY ' . (int) $qn['Query_ID']);
							$this->sqlShowProfileEach[(int) ($qn['Query_ID'] - 1)] = $db->loadAssocList();
						}
					}
				}
				else
				{
					$this->sqlShowProfileEach[0] = array(array('Error' => 'MySql have_profiling = off'));
				}
			}
			catch (Exception $e)
			{
				$this->sqlShowProfileEach[0] = array(array('Error' => $e->getMessage()));
			}
		}

		if (in_array($db->getServerType(), array('mysql', 'postgresql'), true))
		{
			$log = $db->getLog();

			foreach ($log as $k => $query)
			{
				$dbVersion56 = $db->getServerType() === 'mysql' && version_compare($db->getVersion(), '5.6', '>=');

				if ((stripos($query, 'select') === 0) || ($dbVersion56 && ((stripos($query, 'delete') === 0) || (stripos($query, 'update') === 0))))
				{
					try
					{
						$db->setQuery('EXPLAIN ' . ($dbVersion56 ? 'EXTENDED ' : '') . $query);
						$this->explains[$k] = $db->loadAssocList();
					}
					catch (Exception $e)
					{
						$this->explains[$k] = array(array('Error' => $e->getMessage()));
					}
				}
			}
		}
	}

	/**
	 * Displays errors in language files.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displayLanguageFilesInError()
	{
		$errorfiles = JFactory::getLanguage()->getErrorFiles();

		if (!count($errorfiles))
		{
			return '<p>' . JText::_('JNONE') . '</p>';
		}

		$html = array();

		$html[] = '<ul>';

		foreach ($errorfiles as $file => $error)
		{
			$html[] = '<li>' . $this->formatLink($file) . str_replace($file, '', $error) . '</li>';
		}

		$html[] = '</ul>';

		return implode('', $html);
	}

	/**
	 * Display loaded language files.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displayLanguageFilesLoaded()
	{
		$html = array();

		$html[] = '<ul>';

		foreach (JFactory::getLanguage()->getPaths() as /* $extension => */ $files)
		{
			foreach ($files as $file => $status)
			{
				$html[] = '<li>';

				$html[] = $status
					? JText::_('PLG_DEBUG_LANG_LOADED')
					: JText::_('PLG_DEBUG_LANG_NOT_LOADED');

				$html[] = ' : ';
				$html[] = $this->formatLink($file);
				$html[] = '</li>';
			}
		}

		$html[] = '</ul>';

		return implode('', $html);
	}

	/**
	 * Display untranslated language strings.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function displayUntranslatedStrings()
	{
		$stripFirst = $this->params->get('strip-first', 1);
		$stripPref  = $this->params->get('strip-prefix');
		$stripSuff  = $this->params->get('strip-suffix');

		$orphans = JFactory::getLanguage()->getOrphans();

		if (!count($orphans))
		{
			return '<p>' . JText::_('JNONE') . '</p>';
		}

		ksort($orphans, SORT_STRING);

		$guesses = array();

		foreach ($orphans as $key => $occurance)
		{
			if (is_array($occurance) && isset($occurance[0]))
			{
				$info = $occurance[0];
				$file = $info['file'] ?: '';

				if (!isset($guesses[$file]))
				{
					$guesses[$file] = array();
				}

				// Prepare the key.
				if (($pos = strpos($info['string'], '=')) > 0)
				{
					$parts = explode('=', $info['string']);
					$key   = $parts[0];
					$guess = $parts[1];
				}
				else
				{
					$guess = str_replace('_', ' ', $info['string']);

					if ($stripFirst)
					{
						$parts = explode(' ', $guess);

						if (count($parts) > 1)
						{
							array_shift($parts);
							$guess = implode(' ', $parts);
						}
					}

					$guess = trim($guess);

					if ($stripPref)
					{
						$guess = trim(preg_replace(chr(1) . '^' . $stripPref . chr(1) . 'i', '', $guess));
					}

					if ($stripSuff)
					{
						$guess = trim(preg_replace(chr(1) . $stripSuff . '$' . chr(1) . 'i', '', $guess));
					}
				}

				$key = strtoupper(trim($key));
				$key = preg_replace('#\s+#', '_', $key);
				$key = preg_replace('#\W#', '', $key);

				// Prepare the text.
				$guesses[$file][] = $key . '="' . $guess . '"';
			}
		}

		$html = array();

		foreach ($guesses as $file => $keys)
		{
			$html[] = "\n\n# " . ($file ? $this->formatLink($file) : JText::_('PLG_DEBUG_UNKNOWN_FILE')) . "\n\n";
			$html[] = implode("\n", $keys);
		}

		return '<pre>' . implode('', $html) . '</pre>';
	}

	/**
	 * Simple highlight for SQL queries.
	 *
	 * @param   string  $query  The query to highlight.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function highlightQuery($query)
	{
		$newlineKeywords = '#\b(FROM|LEFT|INNER|OUTER|WHERE|SET|VALUES|ORDER|GROUP|HAVING|LIMIT|ON|AND|CASE)\b#i';

		$query = htmlspecialchars($query, ENT_QUOTES);

		$query = preg_replace($newlineKeywords, '<br />&#160;&#160;\\0', $query);

		$regex = array(

			// Tables are identified by the prefix.
			'/(=)/'                                        => '<b class="dbg-operator">$1</b>',

			// All uppercase words have a special meaning.
			'/(?<!\w|>)([A-Z_]{2,})(?!\w)/x'               => '<span class="dbg-command">$1</span>',

			// Tables are identified by the prefix.
			'/(' . $this->db->getPrefix() . '[a-z_0-9]+)/' => '<span class="dbg-table">$1</span>',

		);

		$query = preg_replace(array_keys($regex), array_values($regex), $query);

		$query = str_replace('*', '<b style="color: red;">*</b>', $query);

		return $query;
	}

	/**
	 * Render the backtrace.
	 *
	 * Stolen from JError to prevent it's removal.
	 *
	 * @param   Exception  $error  The Exception object to be rendered.
	 *
	 * @return  string     Rendered backtrace.
	 *
	 * @since   2.5
	 */
	protected function renderBacktrace($error)
	{
		return JLayoutHelper::render('joomla.error.backtrace', array('backtrace' => $error->getTrace()));
	}

	/**
	 * Replaces the Joomla! root with "JROOT" to improve readability.
	 * Formats a link with a special value xdebug.file_link_format
	 * from the php.ini file.
	 *
	 * @param   string  $file  The full path to the file.
	 * @param   string  $line  The line number.
	 *
	 * @return  string
	 *
	 * @since   2.5
	 */
	protected function formatLink($file, $line = '')
	{
		return JHtml::_('debug.xdebuglink', $file, $line);
	}

	/**
	 * Store log messages so they can be displayed later.
	 * This function is passed log entries by JLogLoggerCallback.
	 *
	 * @param   JLogEntry  $entry  A log entry.
	 *
	 * @return  void
	 *
	 * @since   3.1
	 */
	public function logger(JLogEntry $entry)
	{
		$this->logEntries[] = $entry;
	}

	/**
	 * Display log messages.
	 *
	 * @return  string
	 *
	 * @since   3.1
	 */
	protected function displayLogs()
	{
		$priorities = array(
			JLog::EMERGENCY => '<span class="badge badge-important">EMERGENCY</span>',
			JLog::ALERT     => '<span class="badge badge-important">ALERT</span>',
			JLog::CRITICAL  => '<span class="badge badge-important">CRITICAL</span>',
			JLog::ERROR     => '<span class="badge badge-important">ERROR</span>',
			JLog::WARNING   => '<span class="badge badge-warning">WARNING</span>',
			JLog::NOTICE    => '<span class="badge badge-info">NOTICE</span>',
			JLog::INFO      => '<span class="badge badge-info">INFO</span>',
			JLog::DEBUG     => '<span class="badge">DEBUG</span>',
		);

		$out = '';

		$logEntriesTotal = count($this->logEntries);

		// SQL log entries
		$showExecutedSQL = $this->params->get('log-executed-sql', 0);

		if (!$showExecutedSQL)
		{
			$logEntriesDatabasequery = count(
				array_filter(
					$this->logEntries, function ($logEntry)
					{
						return $logEntry->category === 'databasequery';
					}
				)
			);
			$logEntriesTotal         -= $logEntriesDatabasequery;
		}

		// Deprecated log entries
		$logEntriesDeprecated = count(
			array_filter(
				$this->logEntries, function ($logEntry)
				{
					return $logEntry->category === 'deprecated';
				}
			)
		);
		$showDeprecated       = $this->params->get('log-deprecated', 0);

		if (!$showDeprecated)
		{
			$logEntriesTotal -= $logEntriesDeprecated;
		}

		$showEverything = $this->params->get('log-everything', 0);

		$out .= '<h4>' . JText::sprintf('PLG_DEBUG_LOGS_LOGGED', $logEntriesTotal) . '</h4><br />';

		if ($showDeprecated && $logEntriesDeprecated > 0)
		{
			$out .= '
			<div class="alert alert-warning">
				<h4>' . JText::sprintf('PLG_DEBUG_LOGS_DEPRECATED_FOUND_TITLE', $logEntriesDeprecated) . '</h4>
				<div>' . JText::_('PLG_DEBUG_LOGS_DEPRECATED_FOUND_TEXT') . '</div>
			</div>
			<br />';
		}

		$out   .= '<ol>';
		$count = 1;

		foreach ($this->logEntries as $entry)
		{
			// Don't show database queries if not selected.
			if (!$showExecutedSQL && $entry->category === 'databasequery')
			{
				continue;
			}

			// Don't show deprecated logs if not selected.
			if (!$showDeprecated && $entry->category === 'deprecated')
			{
				continue;
			}

			// Don't show everything logs if not selected.
			if (!$showEverything && !in_array($entry->category, array('deprecated', 'databasequery'), true))
			{
				continue;
			}

			$out .= '<li id="dbg_logs_' . $count . '">';
			$out .= '<h5>' . $priorities[$entry->priority] . ' ' . $entry->category . '</h5><br />
				<pre>' . $entry->message . '</pre>';

			if ($entry->callStack)
			{
				$out .= JHtml::_('bootstrap.startAccordion', 'dbg_logs_' . $count, array('active' => ''));
				$out .= JHtml::_('bootstrap.addSlide', 'dbg_logs_' . $count, JText::_('PLG_DEBUG_CALL_STACK'), 'dbg_logs_backtrace_' . $count);
				$out .= $this->renderCallStack($entry->callStack);
				$out .= JHtml::_('bootstrap.endSlide');
				$out .= JHtml::_('bootstrap.endAccordion');
			}

			$out .= '<hr /></li>';
			$count++;
		}

		$out .= '</ol>';

		return $out;
	}

	/**
	 * Renders call stack and back trace in HTML.
	 *
	 * @param   array  $callStack  The call stack and back trace array.
	 *
	 * @return  string  The call stack and back trace in HMTL format.
	 *
	 * @since   3.5
	 */
	protected function renderCallStack(array $callStack = array())
	{
		$htmlCallStack = '';

		if ($callStack !== null)
		{
			$htmlCallStack .= '<div>';
			$htmlCallStack .= '<table class="table table-striped dbg-query-table">';
			$htmlCallStack .= '<thead>';
			$htmlCallStack .= '<tr>';
			$htmlCallStack .= '<th>#</th>';
			$htmlCallStack .= '<th>' . JText::_('PLG_DEBUG_CALL_STACK_CALLER') . '</th>';
			$htmlCallStack .= '<th>' . JText::_('PLG_DEBUG_CALL_STACK_FILE_AND_LINE') . '</th>';
			$htmlCallStack .= '</tr>';
			$htmlCallStack .= '</thead>';
			$htmlCallStack .= '<tbody>';

			$count = count($callStack);

			foreach ($callStack as $call)
			{
				// Dont' back trace log classes.
				if (isset($call['class']) && strpos($call['class'], 'JLog') !== false)
				{
					$count--;
					continue;
				}

				$htmlCallStack .= '<tr>';

				$htmlCallStack .= '<td>' . $count . '</td>';

				$htmlCallStack .= '<td>';

				if (isset($call['class']))
				{
					// If entry has Class/Method print it.
					$htmlCallStack .= htmlspecialchars($call['class'] . $call['type'] . $call['function']) . '()';
				}
				else
				{
					if (isset($call['args']))
					{
						// If entry has args is a require/include.
						$htmlCallStack .= htmlspecialchars($call['function']) . ' ' . $this->formatLink($call['args'][0]);
					}
					else
					{
						// It's a function.
						$htmlCallStack .= htmlspecialchars($call['function']) . '()';
					}
				}

				$htmlCallStack .= '</td>';

				$htmlCallStack .= '<td>';

				// If entry doesn't have line and number the next is a call_user_func.
				if (!isset($call['file']) && !isset($call['line']))
				{
					$htmlCallStack .= JText::_('PLG_DEBUG_CALL_STACK_SAME_FILE');
				}
				// If entry has file and line print it.
				else
				{
					$htmlCallStack .= $this->formatLink(htmlspecialchars($call['file']), htmlspecialchars($call['line']));
				}

				$htmlCallStack .= '</td>';

				$htmlCallStack .= '</tr>';
				$count--;
			}

			$htmlCallStack .= '</tbody>';
			$htmlCallStack .= '</table>';
			$htmlCallStack .= '</div>';

			if (!$this->linkFormat)
			{
				$htmlCallStack .= '<div>[<a href="https://xdebug.org/docs/all_settings#file_link_format" target="_blank" rel="noopener noreferrer">';
				$htmlCallStack .= JText::_('PLG_DEBUG_LINK_FORMAT') . '</a>]</div>';
			}
		}

		return $htmlCallStack;
	}

	/**
	 * Pretty print JSON with colors.
	 *
	 * @param   string  $json  The json raw string.
	 *
	 * @return  string  The json string pretty printed.
	 *
	 * @since   3.5
	 */
	protected function prettyPrintJSON($json = '')
	{
		// In PHP 5.4.0 or later we have pretty print option.
		if (version_compare(PHP_VERSION, '5.4', '>='))
		{
			$json = json_encode($json, JSON_PRETTY_PRINT);
		}

		// Add some colors
		$json = preg_replace('#"([^"]+)":#', '<span class=\'black\'>"</span><span class=\'green\'>$1</span><span class=\'black\'>"</span>:', $json);
		$json = preg_replace('#"(|[^"]+)"(\n|\r\n|,)#', '<span class=\'grey\'>"$1"</span>$2', $json);
		$json = str_replace('null,', '<span class=\'blue\'>null</span>,', $json);

		return $json;
	}

	/**
	 * Write query to the log file
	 *
	 * @return  void
	 *
	 * @since   3.5
	 */
	protected function writeToFile()
	{
		$app    = JFactory::getApplication();
		$domain = $app->isClient('site') ? 'site' : 'admin';
		$input  = $app->input;
		$file   = $app->get('log_path') . '/' . $domain . '_' . $input->get('option') . $input->get('view') . $input->get('layout') . '.sql';

		// Get the queries from log.
		$current = '';
		$db      = $this->db;
		$log     = $db->getLog();
		$timings = $db->getTimings();

		foreach ($log as $id => $query)
		{
			if (isset($timings[$id * 2 + 1]))
			{
				$temp    = str_replace('`', '', $log[$id]);
				$temp    = str_replace(array("\t", "\n", "\r\n"), ' ', $temp);
				$current .= $temp . ";\n";
			}
		}

		if (JFile::exists($file))
		{
			JFile::delete($file);
		}

		// Write new file.
		JFile::write($file, $current);
	}
}