<?php
namespace Westdc\Helpers;

class Tools {

    /**
     * 判断是否为UUID字符串
     * @param $uuid
     * @return int
     */
	public static function isUUID($uuid) {
        if(!is_string($uuid))
            return false;
		return preg_match("/^[0-9A-Za-z]{8}-[0-9A-Za-z]{4}-[0-9A-Za-z]{4}-[0-9A-Za-z]{4}-[0-9A-Za-z]{12}$/",$uuid);
	}

    /**
     * @param $email
     * @return bool
     */
    public static function isEmail($email){

        if(filter_var($email,FILTER_VALIDATE_EMAIL))
            return true;
        else
            return false;
    }

    /**
     * @param $cmd
     */
    public function execBackend($cmd)
    {
        if (substr(php_uname(), 0, 7) == "Windows"){
            pclose(popen("start cmd /c ". $cmd, "r"));
        }
        else {
            exec($cmd . " > /dev/null &");
        }

        return;
    }

    /**
     * 返回的汉语文字信息在windows中是GB2312编码，需要手动改成UTF8
     *  iconv("GB2312","UTF-8",$read);
     * @param $cmd
     * @return array
     */
    public static function execFront($cmd)
    {
        $response = array();
        $handle = popen("$cmd 2>&1", 'r');

        while ($read = fread($handle, 20096)) {

            if(!mb_detect_encoding($read, 'UTF-8', true))
                iconv("GB2312","UTF-8",$read);

            $response[] = trim($read);
        }
        pclose($handle);
        flush();

        return $response;
    }

    /**
     * @return string
     */
    static public function uuid()
    {
        return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
            // 32 bits for "time_low"
            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),

            // 16 bits for "time_mid"
            mt_rand( 0, 0xffff ),

            // 16 bits for "time_hi_and_version",
            // four most significant bits holds version number 4
            mt_rand( 0, 0x0fff ) | 0x4000,

            // 16 bits, 8 bits for "clk_seq_hi_res",
            // 8 bits for "clk_seq_low",
            // two most significant bits holds zero and one for variant DCE1.1
            mt_rand( 0, 0x3fff ) | 0x8000,

            // 48 bits for "node"
            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
        );
    }

    /**
     * 给文件夹末尾加斜线
     * @param $directory
     * @return string
     */
    static function dirSlash($directory){
        if(!preg_match("/(\\/|\\\)$/",$directory))
        {
            $directory.="/";
        }

        return $directory;
    }

    static function getHostLink()
    {
        $protocol = "http";
        if(strpos(strtolower($_SERVER['SERVER_PROTOCOL']),"https"))
        {
            $protocol = "https";
        }
        return $protocol."://".$_SERVER['SERVER_NAME'];
    }

    function count_size($bit)
    {
        $type = array('Bytes','KB','MB','GB','TB');
        for($i = 0; $bit >= 1024; $i++)//单位每增大1024，则单位数组向后移动一位表示相应的单位
        {
            $bit/=1024;
        }
        return (floor($bit*100)/100).$type[$i];//floor是取整函数，为了防止出现一串的小数，这里取了两位小数
    }
	
}