<?php

    namespace WMarkDown\Modules;

    class Headers extends \WMarkDown\Abstracts\Modules{

        private static $ids = [];
        private $id;
        private $level;

        public static function id($text){

            $id = preg_replace('/[^a-z\d\-]+/i', "-", trim($text));
            $test = "" . $id;
            $i = 0;

            while(in_array($test, self::$ids))
                $test = $id . (++ $i == 1 ? "" : "-" . $i);

            self::$ids[] = $id = preg_replace('/\-{2,}/', "-", $test);

            return $id;
        }

        public function get_next_position($string){
            if(!$this->more || $this->from >= 0)
                return;

            $last = null;

            foreach(['/^(\={1,6})(.+)\={1,6}?$/m', '/^(\#{1,6})(.+)$/m'] as $pattern)
                if(preg_match($pattern, $string, $matches, PREG_OFFSET_CAPTURE) && ($last === null || $last > $matches[0][1])){
                    $this->from = $matches[0][1];
                    $this->matches = $matches;
                };

        }

        public function process($string, $modules, $level){

            $html = trim(\WMarkDown\Modules::format($this->wmarkdown, $this->matches[2][0], ["paragraphs"], $modules)["content"]);
            $i = $this->level + 1;

            $this->length = strlen($this->matches[0][0]);
            $this->to = $this->from + $this->length;
            $this->content = $html;
            $modules->menu_level = $this->level = strlen($this->matches[1][0]) + $level;
            $this->id = self::id($html);
            $this->html = '<h' . $i . ' id="' . $this->id . '">' . $html . '</h' . $i . '>';

        }

        public function get_id(){return "" . $this->id;}
        public function get_level(){return  0 | $this->level;}

    }