<?php
    define("DIR","./data/class/");
    define("REG",'/([0-9A-z_, ]*).(?:jpg|svg|png|jpeg)/m');

    class Scanner{
        private $rc = array('classes'=>[]);
        private $classes = null;
        private $rcwu = array('classes'=>[]);
        function __construct(){
            $this->classes = scandir(DIR);
        
            foreach ($this->classes as $key => $value) {
                switch($value){
                    case '.':
                    case '..':
                    case 'classes.json':
                    case 'student.svg':
                        break;
                    default:
                        $this->scanClass($value);
        
        
                        break;
                } 
            }

            $this->writeFiles();
        }


        function scanClass($d){
            $sd = DIR.$d;
            $users_of_class = scandir($sd);
            $this->rc['classes'][]=$d;
            
            $ruoc = [];
            foreach ($users_of_class as $i => $user) {
                if(preg_match_all(REG, $user, $matches, PREG_SET_ORDER, 0)){
                    // delete the last 4 chars
                    $ruoc[] = array(substr($user, 0, -4),substr($user,strlen($user)-3));
                }
            }
            $this->rcwu['classes'][$d]=$ruoc;
        }


        function writeFiles(){
            /**
             * WRITE classes.json FILE 
             */
            $fp = fopen(DIR.'classes.json', 'w');
            fwrite($fp, json_encode($this->rc));
            fclose($fp);
            /**
             * WRITE FOR EACH CLASS
             */
            foreach ($this->rcwu['classes'] as $key => $value) {
                $fp = fopen(DIR.$key.'/user.json', 'w');
                fwrite($fp, json_encode(array('user'=>$this->rcwu['classes'][$key])));
                fclose($fp);
            }
        }
    }

    $s = new Scanner();