<?php
/**
 * Created by PhpStorm.
 * User: Exodus
 * Date: 26.11.2016
 * Time: 17:32
 */

namespace lib;

class Util {

    /**
     * convert array keys to upper/lowercase -> recursive
     * @param $arr
     * @param int $case
     * @return array
     */
    static function arrayChangeKeyCaseRecursive($arr, $case = CASE_LOWER){
        if(is_array($arr)){
            $arr = array_map( function($item){
                if( is_array($item) )
                    $item = self::arrayChangeKeyCaseRecursive($item);
                return $item;
            }, array_change_key_case((array)$arr, $case));
        }

        return $arr;
    }

    /**
     * flatten multidimensional array
     * -> overwrites duplicate keys!
     * @param array $array
     * @return array
     */
    static function arrayFlatten(array $array) : array {
        $return = [];
        array_walk_recursive($array, function($value, $key) use (&$return) { $return[$key] = $value; });
        return $return;
    }

    /**
     * checks whether an array is associative or not (sequential)
     * @param mixed $array
     * @return bool
     */
    static function is_assoc($array): bool {
        $isAssoc = false;
        if(
            is_array($array) &&
            array_keys($array) !== range(0, count($array) - 1)
        ){
            $isAssoc = true;
        }

        return $isAssoc;
    }

    /**
     * convert array keys by a custom callback
     * @param $arr
     * @param $callback
     * @return array
     */
    static function arrayChangeKeys($arr, $callback){
        return array_combine(
            array_map(function ($key) use ($callback){
               return $callback($key);
            }, array_keys($arr)), $arr
        );
    }

    /**
     * convert a string with multiple scopes into an array
     * @param string $scopes
     * @return array|null
     */
    static function convertScopesString($scopes){
        $scopes = array_filter(
            array_map('strtolower',
                (array)explode(' ', $scopes)
            )
        );

        if($scopes){
            sort($scopes);
        }else{
            $scopes = null;
        }

        return $scopes;
    }

    /**
     * obsucre string e.g. password (hide last characters)
     * @param string $string
     * @param int $maxHideChars
     * @return string
     */
    static function obscureString(string $string, int $maxHideChars = 10): string {
        $formatted = '';
        $length = mb_strlen((string)$string);
        if($length > 0){
            $hideChars = ($length < $maxHideChars) ? $length : $maxHideChars;
            $formatted = substr_replace($string, str_repeat('_', min(3, $length)), -$hideChars) .
                ' [' . $length . ']';
        }
        return $formatted;
    }

    /**
     * get hash from an array of ESI scopes
     * @param array $scopes
     * @return string
     */
    static function getHashFromScopes($scopes){
        $scopes = (array)$scopes;
        sort($scopes);
        return md5(serialize($scopes));
    }
}