<?php

namespace MGModule\DNSManager2\mgLibs\custom\manager;

use \MGModule\DNSManager2\models\custom\globalsetting;

class BlockerHelper {
    
    public function __construct() {
        
    }
    
    protected function startsWith($haystack, $needle) {
        return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== false;
    }

    protected function endsWith($haystack, $needle) {
        return $needle === "" || (($temp = strlen($haystack) - strlen($needle)) >= 0 && strpos($haystack, $needle, $temp) !== false);
    }
    
    protected function preparePattern($pattern) {
        $pattern = str_replace('*', '', $pattern);
        $pattern = str_replace('.', '\.', $pattern);
        return $pattern;
    }
    
    public function isLoggedUserExcluded() {
        $excludedClients = globalsetting\GlobalSetting::byKey('blocked_strings_excluded_clients');
        
        if(empty($excludedClients)) {
            return false;
        }
        
        $excludedClients = explode(',', $excludedClients);
        
        return in_array($_SESSION['uid'], $excludedClients);
    }
    
    public function isRecordBlocked($pattern, $subject) {

        if($pattern === "")
        {
            return;
        }

        $isBlocked = false;
        if(strpos($pattern, '*') !== false) {
            if($this->endsWith($pattern, '*')) {
                $isBlocked = preg_match(sprintf('/^%s/', $this->preparePattern($pattern)), $subject);
            }
            else if($this->startsWith($pattern, '*')) {
                $isBlocked = preg_match(sprintf('/%s$/', $this->preparePattern($pattern)), $subject);
            }
            else
            {
                list($exp1, $exp2) = explode('*', $pattern);
                $isBlocked = preg_match(sprintf('/\b%s(.*)%s\b/', $exp1, $exp2), $subject);
            }
        }
        else if(strpos($pattern, '.') !== false) {

            if($this->endsWith($pattern, '.') || $this->startsWith($pattern, '.')) {

                if(strpos($subject, $pattern) !== false) {
                    $isBlocked = true;
                }
            }
            else
            {
                $isBlocked = preg_match(sprintf('/\b%s\b/', $pattern), $subject);
            }
        }
        else {

            $isBlocked = preg_match(sprintf('/\b%s\b/', $pattern), $subject);
        }
        return $isBlocked;
    }
    
    public function getRules($rDNS = false){
        $useRdnsSameAsDns = globalsetting\GlobalSetting::byKey('use_rdns_blocked_same_as_for_dns');
        if($useRdnsSameAsDns != 'on' && $rDNS === true) {
            $settings = globalsetting\GlobalSetting::byKey('rdns_blocked_strings');
        }
        else {
            $settings = globalsetting\GlobalSetting::byKey('dns_blocked_strings');
        }

        return $this->multipleExplode([PHP_EOL, ', ', ',', ' '], $settings->value);      
    }
    
    protected function multipleExplode($delimiters = [], $strings){
            if(in_array(PHP_EOL, $delimiters)){
                unset($delimiters[array_search(PHP_EOL, $delimiters)]);
            }
			
            $readyString = str_replace($delimiters, PHP_EOL, $strings);
            if($readyString == ''){
                    return;
            }
            return explode(PHP_EOL, $readyString);
    }

}