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<?php
/**
 * Matomo - free/libre analytics platform
 *
 * @link https://matomo.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 *
 */

namespace Piwik\Plugins\WordPress;

use Matomo\Dependencies\Monolog\Handler\HandlerInterface;
use Matomo\Dependencies\Monolog\Processor\PsrLogMessageProcessor;
use Piwik\Common;
use Piwik\Config;
use Piwik\Container\StaticContainer;
use Piwik\Log;
use Piwik\Notification;
use Piwik\Notification\Manager;
use Piwik\Plugins\Monolog\Processor\ClassNameProcessor;
use Piwik\Plugins\Monolog\Processor\ExceptionToTextProcessor;
use Piwik\Plugins\Monolog\Processor\RequestIdProcessor;
use Piwik\Plugins\Monolog\Processor\SprintfProcessor;
use Piwik\Plugins\Monolog\Processor\TokenProcessor;
use Piwik\SettingsServer;
use Matomo\Dependencies\Psr\Log\AbstractLogger;
use Piwik\Log\LoggerInterface;
use WpMatomo\Bootstrap;

if (!defined( 'ABSPATH')) {
    exit; // if accessed directly
}

class Logger extends AbstractLogger implements LoggerInterface
{
    const DEBUG = 100;
    const INFO = 200;
    const NOTICE = 250;
    const WARNING = 300;
    const ERROR = 400;
    const CRITICAL = 500;
    const ALERT = 550;
    const EMERGENCY = 600;

    private $levels = array(
        self::DEBUG     => 'DEBUG',
        self::INFO      => 'INFO',
        self::NOTICE    => 'NOTICE',
        self::WARNING   => 'WARNING',
        self::ERROR     => 'ERROR',
        self::CRITICAL  => 'CRITICAL',
        self::ALERT     => 'ALERT',
        self::EMERGENCY => 'EMERGENCY',
    );

    private $writers = array();

    private $is_tracker = false;

    private $level = self::WARNING;

    /**
     * @var \WpMatomo\Logger
     */
    private $logger;

    /**
     * @var HandlerInterface[]
     */
    private $handlers = [];

    public function __construct() {
        $this->logger = new \WpMatomo\Logger();
        $logConfig = Config::getInstance()->log;

        if (!empty($logConfig['log_writers'])) {
            $this->writers = $logConfig['log_writers'];
        }

        $this->is_tracker = SettingsServer::isTrackerApiRequest();

        $level = null;
        if (!empty($logConfig['log_level'])) {
            $level = strtoupper($logConfig['log_level']);

            if (defined('Piwik\Log::'.strtoupper($level))) {
                $this->level = Log::getMonologLevel(constant('Piwik\Log::'.strtoupper($level)));
            }
        }
    }

    public function pushHandler(HandlerInterface $handler)
    {
        $this->handlers[] = $handler;
    }

    private function make_numeric_level($level)
    {
        if (is_string($level) && defined(__CLASS__.'::'.strtoupper($level))) {
            return constant(__CLASS__.'::'.strtoupper($level));
        }

        return $level;
    }

    public function emergency($message, array $context = [])
    {
        $this->log(self::EMERGENCY, $message, $context);
    }

    public function alert($message, array $context = [])
    {
        $this->log(self::ALERT, $message, $context);
    }

    public function critical($message, array $context = array())
    {
        $this->log(self::CRITICAL, $message, $context);
    }

    public function error($message, array $context = [])
    {
        $this->log(self::ERROR, $message, $context);
    }

    public function warning($message, array $context = [])
    {
        $this->log(self::WARNING, $message, $context);
    }

    public function debug($message, array $context = [])
    {
        $this->log(self::DEBUG, $message, $context);
    }

    public function notice($message, array $context = [])
    {
        $this->log(self::NOTICE, $message, $context);
    }

    public function info($message, array $context = [])
    {
        $this->log(self::INFO, $message, $context);
    }


    /**
     * Logs with an arbitrary level.
     *
     * @param mixed $level
     * @param string $message
     * @param array $context
     *
     * @return void
     */
    public function log( $level, $message, array $context = array() ) {

        $is_tracker_debug = $this->is_tracker && ((!empty($GLOBALS['PIWIK_TRACKER_DEBUG']) && $GLOBALS['PIWIK_TRACKER_DEBUG'] === true) || StaticContainer::get("ini.Tracker.debug"));

        if ( !$is_tracker_debug && (!defined( 'WP_DEBUG' ) || WP_DEBUG !== true )) {
            return;
        }

        $level = $this->make_numeric_level($level);

        if ($is_tracker_debug) {
            $this->level = self::DEBUG;
        }

        if ($level < $this->level) {
            return;
        }

        $title = '';
        if ($this->levels[$level]) {
            $title = $this->levels[$level] . ': ';
        }

        $record = array('message' => $message, 'context' => $context);
        $processors = [
            new SprintfProcessor(),
            new ClassNameProcessor(),
            new RequestIdProcessor(),
            new ExceptionToTextProcessor(),
            new PsrLogMessageProcessor(),
            new TokenProcessor()
        ];
        foreach ($processors as $processor) {
            $record = call_user_func($processor, $record);
        }
        $message = $record['message'];

        if (!Common::isPhpCliMode()
            && !Bootstrap::was_bootstrapped_by_wordpress() // we don't want to show log messages while being in wordpress
            && in_array('screen', $this->writers)
            && !empty($message)) {
            if ($this->is_tracker) {
                if ($is_tracker_debug) {
                    echo time() . ': ' . $message . "\n";
                }
            } else {

                switch ($level) {
                    case Logger::EMERGENCY:
                    case Logger::ALERT:
                    case Logger::CRITICAL:
                    case Logger::ERROR:
                        $contextNotification = Notification::CONTEXT_ERROR;
                        break;
                    case Logger::WARNING:
                        $contextNotification = Notification::CONTEXT_WARNING;
                        break;
                    default:
                        $contextNotification = Notification::CONTEXT_INFO;
                        break;
                }
                $message = $title . htmlentities($message, ENT_COMPAT | ENT_HTML401, 'UTF-8');

                $notification = new Notification($message);
                $notification->context = $contextNotification;
                $notification->flags = 0;
                try {
                    Manager::notify(Common::getRandomString(), $notification);
                } catch (\Zend_Session_Exception $e) {
                    // Can happen if this handler is enabled in CLI
                    // Silently ignore the error.
                }
            }
        }

        $this->logger->log($message);

        foreach ($this->handlers as $handler) {
            $handler->handle($record);
        }
    }
}