<?php
namespace Forge12\Shared;

// Sicherstellen, dass Interface existiert
if (! interface_exists('Forge12\Shared\LoggerInterface')) {
    require_once __DIR__ . '/logger.interface.php';
}

if (!defined('F12_DEBUG')) {
    define('F12_DEBUG', false);
}

if (!defined('F12_DEBUG_LOG_LEVEL')) {
    define('F12_DEBUG_LOG_LEVEL', 200);
}

if ( ! class_exists( 'Forge12\Shared\Logger' ) ) {
    class Logger implements LoggerInterface {
        private static $instance;
        private $log_file;
        private $log_level;
        private $log_dir;

        const DEBUG    = 100;
        const INFO     = 200;
        const NOTICE   = 250;
        const WARNING  = 300;
        const ERROR    = 400;
        const CRITICAL = 500;

        private function __construct() {
            if ( ! defined( 'F12_DEBUG' ) || ! F12_DEBUG ) {
                // Wenn F12_DEBUG nicht definiert ist oder false, beenden wir.
                return;
            }

            $upload_dir   = wp_upload_dir();
            $this->log_dir = $upload_dir['basedir'] . '/f12-logs';

            if ( ! file_exists( $this->log_dir ) ) {
                wp_mkdir_p( $this->log_dir );
            }

            // Tagesbasiert loggen
            $this->log_file = $this->log_dir . '/plugins-' . date('Y-m-d') . '.log';

            // Setze Level je nach WP_DEBUG
            $this->log_level = F12_DEBUG_LOG_LEVEL;
        }

        public static function getInstance() {
            if ( ! self::$instance ) {
                self::$instance = new self();
            }
            return self::$instance;
        }

        private function sanitizeContext(array $context): array {
            foreach ($context as $key => $value) {
                if (in_array(strtolower($key), ['ip', 'user_ip'])) {
                    $context[$key] = $this->mask_ip($value);
                }
                if (in_array(strtolower($key), ['email', 'user_email'])) {
                    $context[$key] = $this->mask_email($value);
                }
                if (in_array(strtolower($key), ['password', 'pwd'])) {
                    $context[$key] = $this->mask_password($value);
                }
            }
            return $context;
        }

        private function mask_password(string $password): string {
            return '********';
        }

        private function mask_email(string $email): string {
            if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
                return 'invalid';
            }
            [$user, $domain] = explode('@', $email, 2);
            $len = strlen($user);
            if ($len <= 2) {
                $maskedUser = substr($user, 0, 1) . '*';
            } else {
                $maskedUser = substr($user, 0, 1) . str_repeat('*', $len - 2) . substr($user, -1);
            }
            return $maskedUser . '@' . $domain;
        }

        private function mask_ip(string $ip): string {
            if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
                $parts = explode('.', $ip);
                $parts[3] = '0';
                return implode('.', $parts);
            }
            if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
                return substr($ip, 0, 20) . '::';
            }
            return 'unknown';
        }

        private function rotateLogs(int $maxSize = 52428800, int $maxFiles = 5): void {
            if (file_exists($this->log_file) && filesize($this->log_file) > $maxSize) {
                for ($i = $maxFiles - 1; $i >= 1; $i--) {
                    $old = $this->log_file . '.' . $i;
                    $new = $this->log_file . '.' . ($i + 1);
                    if (file_exists($old)) {
                        rename($old, $new);
                    }
                }
                rename($this->log_file, $this->log_file . '.1');
            }
        }

        private function cleanupOldLogs(int $days = 7): void {
            foreach (glob($this->log_dir . '/plugins-*.log*') as $file) {
                if (filemtime($file) < strtotime("-{$days} days")) {
                    @unlink($file);
                }
            }
        }

        private function writeLog( $level, $levelName, $message, array $context = [] ) {
            if ( ! defined( 'F12_DEBUG' ) || ! F12_DEBUG ) {
                // Wenn F12_DEBUG nicht definiert ist oder false, beenden wir.
                return;
            }

            if ( $level < $this->log_level ) {
                return;
            }

            // Cleanup & Rotation bei jedem Schreiben
            $this->cleanupOldLogs();
            $this->rotateLogs();

            $context = $this->sanitizeContext($context);

            $time   = date( 'Y-m-d H:i:s' );
            $plugin = $context['plugin'] ?? 'unknown';
            $msg    = sprintf( "[%s] [%s] [%s] %s %s\n",
                $time,
                strtoupper( $levelName ),
                $plugin,
                $message,
                $context ? json_encode( $context ) : ''
            );
            error_log( $msg, 3, $this->log_file );
        }

        public function debug( $message, array $context = [] ) :void {
            $this->writeLog( self::DEBUG, 'DEBUG', $message, $context );
        }

        public function info( $message, array $context = [] ) : void {
            $this->writeLog( self::INFO, 'INFO', $message, $context );
        }

        public function error( $message, array $context = [] ) : void {
            $this->writeLog( self::ERROR, 'ERROR', $message, $context );
        }

        public function warning( $message, array $context = [] ) : void {
            $this->writeLog( self::WARNING, 'WARNING', $message, $context );
        }

        public function notice( $message, array $context = [] ) : void {
            $this->writeLog( self::NOTICE, 'NOTICE', $message, $context );
        }

        public function critical( $message, array $context = [] ) : void {
            $this->writeLog( self::CRITICAL, 'CRITICAL', $message, $context );
        }
    }
}