<?php

namespace app\common\service;

use think\facade\Config;


class YouDaoTrans {
    private $app_key;
    private $sec_key;
    private $trans_url;
    public function __construct($options = array()) {
        $this->app_key = isset($options['app_key']) ? $options['app_key'] : Config::get('youdao.app_key');
        $this->sec_key = isset($options['sec_key']) ? $options['sec_key'] : Config::get('youdao.sec_key');
        $this->trans_url = isset($options['trans_url']) ? $options['trans_url'] : Config::get('youdao.trans_url');
    }
    
    public function do_translate($q, $from, $to) {
        $salt = YouDaoTrans::create_guid();
        $args = array(
            'q'      => $q,
            'appKey' => $this->app_key,
            'salt'   => $salt,
        );
        $args['from'] = $from;
        $args['to'] = $to;
        $args['signType'] = 'v3';
        $curtime = strtotime("now");
        $args['curtime'] = $curtime;
        $signStr = $this->app_key . YouDaoTrans::truncate(implode("", $q)) . $salt . $curtime . $this->sec_key;
        $args['sign'] = hash("sha256", $signStr);
        $args['vocabId'] = '0';
        $ret = YouDaoTrans::call($this->trans_url, $args);
        return $ret;
    }
    
    // 发起网络请求
    public static function call($url, $args = NULL, $method = "post", $testflag = 0, $timeout = 2000, $headers = array()) {
        $ret = FALSE;
        $i = 0;
        while ($ret === FALSE) {
            if ($i > 1)
                break;
            if ($i > 0) {
                sleep(1);
            }
            $ret = YouDaoTrans::callOnce($url, $args, $method, FALSE, $timeout, $headers);
            $i++;
        }
        return $ret;
    }
    
    public static function callOnce($url, $args = NULL, $method = "post", $withCookie = FALSE, $timeout = 2000, $headers = array()) {
        $ch = curl_init();
        if ($method == "post") {
            $data = YouDaoTrans::convert($args);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
            curl_setopt($ch, CURLOPT_POST, 1);
        } else {
            $data = YouDaoTrans::convert($args);
            if ($data) {
                if (stripos($url, "?") > 0) {
                    $url .= "&$data";
                } else {
                    $url .= "?$data";
                }
            }
        }
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        if (!empty($headers)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        }
        if ($withCookie) {
            curl_setopt($ch, CURLOPT_COOKIEJAR, $_COOKIE);
        }
        $r = curl_exec($ch);
        curl_close($ch);
        return $r;
    }
    
    public static function convert(&$args) {
        $data = '';
        if (is_array($args)) {
            foreach ($args as $key => $val) {
                if (is_array($val)) {
                    foreach ($val as $k => $v) {
                        $data .= 'q=' . rawurlencode($v) . '&';
                    }
                } else {
                    $data .= "$key=" . rawurlencode($val) . "&";
                }
            }
            return trim($data, "&");
        }
        return $args;
    }
    
    // uuid generator
    public static function create_guid() {
        $microTime = microtime();
        list($a_dec, $a_sec) = explode(" ", $microTime);
        $dec_hex = dechex($a_dec * 1000000);
        $sec_hex = dechex($a_sec);
        YouDaoTrans::ensure_length($dec_hex, 5);
        YouDaoTrans::ensure_length($sec_hex, 6);
        $guid = "";
        $guid .= $dec_hex;
        $guid .= YouDaoTrans::create_guid_section(3);
        $guid .= '-';
        $guid .= YouDaoTrans::create_guid_section(4);
        $guid .= '-';
        $guid .= YouDaoTrans::create_guid_section(4);
        $guid .= '-';
        $guid .= YouDaoTrans::create_guid_section(4);
        $guid .= '-';
        $guid .= $sec_hex;
        $guid .= YouDaoTrans::create_guid_section(6);
        return $guid;
    }
    
    public static function create_guid_section($characters) {
        $return = "";
        for ($i = 0; $i < $characters; $i++) {
            $return .= dechex(mt_rand(0, 15));
        }
        return $return;
    }
    
    public static function truncate($q) {
        $len = YouDaoTrans::abslength($q);
        return $len <= 20 ? $q : (mb_substr($q, 0, 10) . $len . mb_substr($q, $len - 10, $len));
    }
    
    public static function abslength($str) {
        if (empty($str)) {
            return 0;
        }
        if (function_exists('mb_strlen')) {
            return mb_strlen($str, 'utf-8');
        } else {
            preg_match_all("/./u", $str, $ar);
            return count($ar[0]);
        }
    }
    
    public static function ensure_length(&$string, $length) {
        $strlen = strlen($string);
        if ($strlen < $length) {
            $string = str_pad($string, $length, "0");
        } else if ($strlen > $length) {
            $string = substr($string, 0, $length);
        }
    }
    
 
}