<?php

namespace App\Helpers;

use App\Auth\XenForoUser;

class XenForoHelpers {

    const array XF_AVATAR_COLORS = ['#FF6B6B','#FF9F43','#48DBFB','#1DD1A1','#5F27CD','#341f97','#EE5A24','#009432'];

    /**
     * Have XenForo default profile picture letter.
     *
     * @param ?XenForoUser $user If null, default : actual user.
     *
     * @return string
     */
    public static function getAvatarLetter( ?XenForoUser $user = null ): string {
        if( $user === null ) {
            $user = \Auth::user();
            if( $user === null ) {
                return '';
            }
        }
        return strtoupper(mb_substr($user->data->username, 0, 1));
    }

    public static function getAvatarColor( ?XenForoUser $user = null ): string {
        if( $user === null ) {
            $user = \Auth::user();
            if( $user === null ) {
                return '';
            }
        }
        return self::XF_AVATAR_COLORS[ crc32( $user->data->username ) % count( self::XF_AVATAR_COLORS ) ];
    }
}