<?php
namespace App;

use App\Models\Interlink;

class PageInterlink {
    static function interlink_filter($content, $firstrun=true)
    {
        global $protectblocks;

        $content = preg_replace_callback('!(\<a[^>]*\>([^>]*)\>)!ims',function ($blocks){
            global $protectblocks;
            $protectblocks[] = $blocks[1];
            return '[block]'.(count($protectblocks)-1).'[/block]';
        }, $content);

        if($firstrun)
        {
            $content = preg_replace_callback('!(\<code\>[\S\s]*?\<\/code\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);


            $content = preg_replace_callback('!(\[tags*\][\S\s]*?\[\/tags*\])!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);


            $content = preg_replace_callback('!(\<img[^>]*\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);

            $content = preg_replace_callback('!(\<h1[^>]*\>([^>]*)\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);

            $content = preg_replace_callback('!(\<h2[^>]*\>([^>]*)\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);


            $content = preg_replace_callback('!(\<h3[^>]*\>([^>]*)\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);


            $content = preg_replace_callback('!(\<h4[^>]*\>([^>]*)\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);


            $content = preg_replace_callback('!(\<h5[^>]*\>([^>]*)\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);


            $content = preg_replace_callback('!(\<h6[^>]*\>([^>]*)\>)!ims', function ($blocks){
                global $protectblocks;
                $protectblocks[] = $blocks[1];
                return '[block]'.(count($protectblocks)-1).'[/block]';
            }, $content);
        }


        $keywords = Interlink::orderBy('Priority','ASC')->get();

            foreach($keywords as $keyR){

                if ($keyR->OpenInNewWindow) {
                    $openExternalWindow = 'target="_blank" rel="noopener"';
                } else {
                    $openExternalWindow = '';
                }

                $ankerTag = '<a href="'.$keyR->Link.'" '.$openExternalWindow.'>'.$keyR->Keyword.'</a>';
                //$changedText = preg_replace('/('.preg_quote($keyR->keyword, '/').')/i', $ankerTag, $changedText,$keyR->count);  // change by character
                $content = preg_replace(sprintf('/\b%s\b/',preg_quote($keyR->Keyword)), $ankerTag, $content,$keyR->Count); //change by word
            }

            $content = preg_replace_callback('!(\[block\]([0-9]*?)\[\/block\])!', function ($blocks){
            global $protectblocks;
            $protectblocks[] = $blocks[1];
            return $protectblocks[$blocks[2]];
        }, $content);


        return $content;
    }

    public static function interlink_formatter(string $html = null)
    {
        return static::interlink_filter($html);
    }
}