<?php

namespace App\Services;

use App\Exceptions\E;

class Utils
{
    /**
     * Simple SQL injection protection
     *
     * @param  string $string
     * @return string
     */
    public static function convertString($string) {
        return addslashes(trim($string));
    }

    /**
     * Get the value of key in an array if index exist
     *
     * @param  string $key
     * @param  array $array
     * @return string|boolean
     */
    public static function getValue($key, $array) {
        if (array_key_exists($key, $array)) {
            return $array[$key];
        }
        return false;
    }

    /**
     * Generate random string
     *
     * @param  int $length
     * @return string
     */
    public static function generateRndString($length) {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|';
        $rnd_string = '';
        for ($i = 0; $i < $length; $i++) {
            $rnd_string .= $chars[mt_rand(0, strlen($chars) - 1)];
        }
        return $rnd_string;
    }

    public static function getTimeFormatted($timestamp = 0)
    {
        // set default time zone to UTC+8
        date_default_timezone_set('Asia/Shanghai');
        return ($timestamp == 0) ? date('Y-m-d H:i:s') : date('Y-m-d H:i:s', $timestamp);
    }

    public static function getNameOrEmail(\App\Models\User $user)
    {
        return ($user->getNickName() == '') ? $_SESSION['email'] : $user->getNickName();
    }

    public static function getAvatarFname(\App\Models\User $user)
    {
        $fname = base64_encode($user->email).".png";
        if (Option::get('avatar_query_string')) {
            $fname .= '?v='.$user->getAvatarId();
        }
        return $fname;
    }

}