', '', $resultTask));
            }

            Common::printDebug('Finished Scheduled Tasks.');
        } else {
            Common::printDebug("-> Scheduled tasks not triggered.");
        }
        Common::printDebug("Next run will be from: " . date('Y-m-d H:i:s', $nextRunTime) . ' UTC');
    }

    static public $initTrackerMode = false;

    /**
     * Used to initialize core Piwik components on a piwik.php request
     * Eg. when cache is missed and we will be calling some APIs to generate cache
     */
    static public function initCorePiwikInTrackerMode()
    {
        if (SettingsServer::isTrackerApiRequest()
            && self::$initTrackerMode === false
        ) {
            self::$initTrackerMode = true;
            require_once PIWIK_INCLUDE_PATH . '/core/Loader.php';
            require_once PIWIK_INCLUDE_PATH . '/core/Option.php';

            $access = Access::getInstance();
            $config = Config::getInstance();

            try {
                Db::get();
            } catch (Exception $e) {
                Db::createDatabaseObject();
            }

            \Piwik\Plugin\Manager::getInstance()->loadCorePluginsDuringTracker();
        }
    }

    /**
     * Echos an error message & other information, then exits.
     *
     * @param Exception $e
     * @param bool $authenticated
     */
    protected function exitWithException($e, $authenticated = false)
    {
        if ($this->usingBulkTracking) {
            // when doing bulk tracking we return JSON so the caller will know how many succeeded
            $result = array(
                'status'  => 'error',
                'tracked' => $this->countOfLoggedRequests
            );
            // send error when in debug mode or when authenticated (which happens when doing log importing,
            if ((isset($GLOBALS['PIWIK_TRACKER_DEBUG']) && $GLOBALS['PIWIK_TRACKER_DEBUG'])
                || $authenticated
            ) {
                $result['message'] = $this->getMessageFromException($e);
            }
            Common::sendHeader('Content-Type: application/json');
            echo Common::json_encode($result);
            exit;
        }

        if (isset($GLOBALS['PIWIK_TRACKER_DEBUG']) && $GLOBALS['PIWIK_TRACKER_DEBUG']) {
            Common::sendHeader('Content-Type: text/html; charset=utf-8');
            $trailer = 'Backtrace:
' . $e->getTraceAsString() . '';
            $headerPage = file_get_contents(PIWIK_INCLUDE_PATH . '/plugins/Zeitgeist/templates/simpleLayoutHeader.tpl');
            $footerPage = file_get_contents(PIWIK_INCLUDE_PATH . '/plugins/Zeitgeist/templates/simpleLayoutFooter.tpl');
            $headerPage = str_replace('{$HTML_TITLE}', 'Piwik › Error', $headerPage);

            echo $headerPage . '
' . $this->getMessageFromException($e) . '
' . $trailer . $footerPage;
        } // If not debug, but running authenticated (eg. during log import) then we display raw errors
        elseif ($authenticated) {
            Common::sendHeader('Content-Type: text/html; charset=utf-8');
            echo $this->getMessageFromException($e);
        } else {
            $this->outputTransparentGif();
        }
        exit;
    }

    /**
     * Returns the date in the "Y-m-d H:i:s" PHP format
     *
     * @param int $timestamp
     * @return string
     */
    public static function getDatetimeFromTimestamp($timestamp)
    {
        return date("Y-m-d H:i:s", $timestamp);
    }

    /**
     * Initialization
     */
    protected function init(Request $request)
    {
        $this->loadTrackerPlugins($request);
        $this->handleTrackingApi($request);
        $this->handleDisabledTracker();
        $this->handleEmptyRequest($request);

        Common::printDebug("Current datetime: " . date("Y-m-d H:i:s", $request->getCurrentTimestamp()));
    }

    /**
     * Cleanup
     */
    protected function end()
    {
        if ($this->usingBulkTracking) {
            $result = array(
                'status'  => 'success',
                'tracked' => $this->countOfLoggedRequests
            );
            Common::sendHeader('Content-Type: application/json');
            echo Common::json_encode($result);
            exit;
        }
        switch ($this->getState()) {
            case self::STATE_LOGGING_DISABLE:
                $this->outputTransparentGif();
                Common::printDebug("Logging disabled, display transparent logo");
                break;

            case self::STATE_EMPTY_REQUEST:
                Common::printDebug("Empty request => Piwik page");
                echo "Piwik is a free open source web analytics that lets you keep control of your data.";
                break;

            case self::STATE_NOSCRIPT_REQUEST:
            case self::STATE_NOTHING_TO_NOTICE:
            default:
                $this->outputTransparentGif();
                Common::printDebug("Nothing to notice => default behaviour");
                break;
        }
        Common::printDebug("End of the page.");

        if ($GLOBALS['PIWIK_TRACKER_DEBUG'] === true) {
            if (isset(self::$db)) {
                self::$db->recordProfiling();
                Profiler::displayDbTrackerProfile(self::$db);
            }
        }

        self::disconnectDatabase();
    }

    /**
     * Factory to create database objects
     *
     * @param array $configDb Database configuration
     * @throws Exception
     * @return \Piwik\Tracker\Db\Mysqli|\Piwik\Tracker\Db\Pdo\Mysql
     */
    public static function factory($configDb)
    {
        /**
         * Triggered before a connection to the database is established by the Tracker.
         *
         * This event can be used to change the database connection settings used by the Tracker.
         *
         * @param array $dbInfos Reference to an array containing database connection info,
         *                       including:
         *
         *                       - **host**: The host name or IP address to the MySQL database.
         *                       - **username**: The username to use when connecting to the
         *                                       database.
         *                       - **password**: The password to use when connecting to the
         *                                       database.
         *                       - **dbname**: The name of the Piwik MySQL database.
         *                       - **port**: The MySQL database port to use.
         *                       - **adapter**: either `'PDO_MYSQL'` or `'MYSQLI'`
         *                       - **type**: The MySQL engine to use, for instance 'InnoDB'
         */
        Piwik::postEvent('Tracker.getDatabaseConfig', array(&$configDb));

        switch ($configDb['adapter']) {
            case 'PDO\MYSQL':
            case 'PDO_MYSQL': // old format pre Piwik 2
                require_once PIWIK_INCLUDE_PATH . '/core/Tracker/Db/Pdo/Mysql.php';
                return new Mysql($configDb);

            case 'MYSQLI':
                require_once PIWIK_INCLUDE_PATH . '/core/Tracker/Db/Mysqli.php';
                return new Mysqli($configDb);
        }

        throw new Exception('Unsupported database adapter ' . $configDb['adapter']);
    }

    public static function connectPiwikTrackerDb()
    {
        $db = null;
        $configDb = Config::getInstance()->database;

        if (!isset($configDb['port'])) {
            // before 0.2.4 there is no port specified in config file
            $configDb['port'] = '3306';
        }

        $db = Tracker::factory($configDb);
        $db->connect();

        return $db;
    }

    protected static function connectDatabaseIfNotConnected()
    {
        if (!is_null(self::$db)) {
            return;
        }

        try {
            self::$db = self::connectPiwikTrackerDb();
        } catch (Exception $e) {
            throw new DbException($e->getMessage(), $e->getCode());
        }
    }

    /**
     * @return Db
     */
    public static function getDatabase()
    {
        self::connectDatabaseIfNotConnected();
        return self::$db;
    }

    public static function disconnectDatabase()
    {
        if (isset(self::$db)) {
            self::$db->disconnect();
            self::$db = null;
        }
    }

    /**
     * Returns the Tracker_Visit object.
     * This method can be overwritten to use a different Tracker_Visit object
     *
     * @throws Exception
     * @return \Piwik\Tracker\Visit
     */
    protected function getNewVisitObject()
    {
        $visit = null;

        /**
         * Triggered before a new **visit tracking object** is created. Subscribers to this
         * event can force the use of a custom visit tracking object that extends from
         * {@link Piwik\Tracker\VisitInterface}.
         * 
         * @param \Piwik\Tracker\VisitInterface &$visit Initialized to null, but can be set to
         *                                              a new visit object. If it isn't modified
         *                                              Piwik uses the default class.
         */
        Piwik::postEvent('Tracker.makeNewVisitObject', array(&$visit));

        if (is_null($visit)) {
            $visit = new Visit();
        } elseif (!($visit instanceof VisitInterface)) {
            throw new Exception("The Visit object set in the plugin must implement VisitInterface");
        }
        return $visit;
    }

    protected function outputTransparentGif()
    {
        if (isset($GLOBALS['PIWIK_TRACKER_DEBUG'])
            && $GLOBALS['PIWIK_TRACKER_DEBUG']
        ) {
            return;
        }

        if (strlen($this->getOutputBuffer()) > 0) {
            // If there was an error during tracker, return so errors can be flushed
            return;
        }
        $transGifBase64 = "R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==";
        Common::sendHeader('Content-Type: image/gif');

        $this->outputAccessControlHeaders();

        print(base64_decode($transGifBase64));
    }

    protected function isVisitValid()
    {
        return $this->stateValid !== self::STATE_LOGGING_DISABLE
        && $this->stateValid !== self::STATE_EMPTY_REQUEST;
    }

    protected function getState()
    {
        return $this->stateValid;
    }

    protected function setState($value)
    {
        $this->stateValid = $value;
    }

    protected function loadTrackerPlugins(Request $request)
    {
        // Adding &dp=1 will disable the provider plugin, if token_auth is used (used to speed up bulk imports)
        $disableProvider = $request->getParam('dp');
        if (!empty($disableProvider)) {
            Tracker::setPluginsNotToLoad(array('Provider'));
        }

        try {
            $pluginsTracker = \Piwik\Plugin\Manager::getInstance()->loadTrackerPlugins();
            Common::printDebug("Loading plugins: { " . implode(",", $pluginsTracker) . " }");
        } catch (Exception $e) {
            Common::printDebug("ERROR: " . $e->getMessage());
        }
    }

    protected function handleEmptyRequest(Request $request)
    {
        $countParameters = $request->getParamsCount();
        if ($countParameters == 0) {
            $this->setState(self::STATE_EMPTY_REQUEST);
        }
        if ($countParameters == 1) {
            $this->setState(self::STATE_NOSCRIPT_REQUEST);
        }
    }

    protected function handleDisabledTracker()
    {
        $saveStats = Config::getInstance()->Tracker['record_statistics'];
        if ($saveStats == 0) {
            $this->setState(self::STATE_LOGGING_DISABLE);
        }
    }

    protected function getTokenAuth()
    {
        if (!is_null($this->tokenAuth)) {
            return $this->tokenAuth;
        }

        return Common::getRequestVar('token_auth', false);
    }

    /**
     * This method allows to set custom IP + server time + visitor ID, when using Tracking API.
     * These two attributes can be only set by the Super User (passing token_auth).
     */
    protected function handleTrackingApi(Request $request)
    {
        if (!$request->isAuthenticated()) {
            return;
        }

        // Custom IP to use for this visitor
        $customIp = $request->getParam('cip');
        if (!empty($customIp)) {
            $this->setForceIp($customIp);
        }

        // Custom server date time to use
        $customDatetime = $request->getParam('cdt');
        if (!empty($customDatetime)) {
            $this->setForceDateTime($customDatetime);
        }

        // Forced Visitor ID to record the visit / action
        $customVisitorId = $request->getParam('cid');
        if (!empty($customVisitorId)) {
            $this->setForceVisitorId($customVisitorId);
        }
    }

    public static function setTestEnvironment($args = null, $requestMethod = null)
    {
        if (is_null($args)) {
            $postData = self::getRequestsArrayFromBulkRequest(self::getRawBulkRequest());
            $args = $_GET + $postData;
        }
        if (is_null($requestMethod) && array_key_exists('REQUEST_METHOD', $_SERVER)) {
            $requestMethod = $_SERVER['REQUEST_METHOD'];
        } else if (is_null($requestMethod)) {
            $requestMethod = 'GET';
        }

        // Do not run scheduled tasks during tests
        self::updateTrackerConfig('scheduled_tasks_min_interval', 0);

        // if nothing found in _GET/_POST and we're doing a POST, assume bulk request. in which case,
        // we have to bypass authentication
        if (empty($args) && $requestMethod == 'POST') {
            self::updateTrackerConfig('tracking_requests_require_authentication', 0);
        }

        // Tests can force the use of 3rd party cookie for ID visitor
        if (Common::getRequestVar('forceUseThirdPartyCookie', false, null, $args) == 1) {
            self::updateTrackerConfig('use_third_party_id_cookie', 1);
        }

        // Tests using window_look_back_for_visitor
        if (Common::getRequestVar('forceLargeWindowLookBackForVisitor', false, null, $args) == 1
            // also look for this in bulk requests (see fake_logs_replay.log)
            || strpos( json_encode($args, true), '"forceLargeWindowLookBackForVisitor":"1"' ) !== false) {
            self::updateTrackerConfig('window_look_back_for_visitor', 2678400);
        }

        // Tests can force the enabling of IP anonymization
        if (Common::getRequestVar('forceIpAnonymization', false, null, $args) == 1) {

            self::connectDatabaseIfNotConnected();

            $privacyConfig = new PrivacyManagerConfig();
            $privacyConfig->ipAddressMaskLength = 2;

            \Piwik\Plugins\PrivacyManager\IPAnonymizer::activate();
        }

        // Custom IP to use for this visitor
        $customIp = Common::getRequestVar('cip', false, null, $args);
        if (!empty($customIp)) {
            self::setForceIp($customIp);
        }

        // Custom server date time to use
        $customDatetime = Common::getRequestVar('cdt', false, null, $args);
        if (!empty($customDatetime)) {
            self::setForceDateTime($customDatetime);
        }

        // Custom visitor id
        $customVisitorId = Common::getRequestVar('cid', false, null, $args);
        if (!empty($customVisitorId)) {
            self::setForceVisitorId($customVisitorId);
        }
        $pluginsDisabled = array('Provider');

        // Disable provider plugin, because it is so slow to do many reverse ip lookups
        self::setPluginsNotToLoad($pluginsDisabled);
    }

    /**
     * Gets the error message to output when a tracking request fails.
     *
     * @param Exception $e
     * @return string
     */
    private function getMessageFromException($e)
    {
        // Note: duplicated from FormDatabaseSetup.isAccessDenied
        // Avoid leaking the username/db name when access denied
        if ($e->getCode() == 1044 || $e->getCode() == 42000) {
            return "Error while connecting to the Piwik database - please check your credentials in config/config.ini.php file";
        } else {
            return $e->getMessage();
        }
    }

    /**
     * @param $params
     * @param $tokenAuth
     * @return array
     */
    protected function trackRequest($params, $tokenAuth)
    {
        if ($params instanceof Request) {
            $request = $params;
        } else {
            $request = new Request($params, $tokenAuth);
        }

        $this->init($request);

        $isAuthenticated = $request->isAuthenticated();

        try {
            if ($this->isVisitValid()) {
                $visit = $this->getNewVisitObject();
                $request->setForcedVisitorId(self::$forcedVisitorId);
                $request->setForceDateTime(self::$forcedDateTime);
                $request->setForceIp(self::$forcedIpString);

                $visit->setRequest($request);
                $visit->handle();
            } else {
                Common::printDebug("The request is invalid: empty request, or maybe tracking is disabled in the config.ini.php via record_statistics=0");
            }
        } catch (DbException $e) {
            Common::printDebug("Exception: " . $e->getMessage());
            $this->exitWithException($e, $isAuthenticated);
        } catch (Exception $e) {
            $this->exitWithException($e, $isAuthenticated);
        }
        $this->clear();

        // increment successfully logged request count. make sure to do this after try-catch,
        // since an excluded visit is considered 'successfully logged'
        ++$this->countOfLoggedRequests;
        return $isAuthenticated;
    }


    protected function runScheduledTasksIfAllowed($isAuthenticated)
    {
        // Do not run schedule task if we are importing logs
        // or doing custom tracking (as it could slow down)
        try {
            if (!$isAuthenticated
                && $this->shouldRunScheduledTasks()
            ) {
                self::runScheduledTasks();
            }
        } catch (Exception $e) {
            $this->exitWithException($e);
        }
    }

    /**
     * @return string
     */
    protected static function getRawBulkRequest()
    {
        return file_get_contents("php://input");
    }
}