<?php
namespace app\expand\controller;
use app\common\service\HelperService;
use think\Validate;

/**
 * 汉字转拼音接口
 * Class PinYin
 * @package app\expand\controller
 */
class PinYin extends BaseAuth
{

    private $_Account = null;

    public function __construct(){
        parent::__construct();

        $this->_Account = $this->getKey($this->_apiCode);
        //验证是否具有访问这个接口的权限
        if(!isset($this->_Account['PinYin'])){
            HelperService::returnJson(['code'=>400,'msg'=>'pinyin unauthorized access','data'=>[]]);
        }
    }

    /**
     * 将汉字翻译成拼音
     */
    public function transChinese(){
        $params = $this->_params;
        $rule = [
            'old_string|待翻译参数'=>'require',
            'is_first_word|是否仅需要首字母'=>'require'
        ];

        $validate = new Validate($rule);
        if(!$validate->check($params)){
            HelperService::returnJson(['code'=>400,'msg'=>$validate->getError(),'data'=>$params]);
        }

        $pinYin = $this->trans($params['old_string'],$this->pinYin());
        
        HelperService::returnJson(['code'=>200,'msg'=>'success','data'=>$pinYin]);
    }

    /**
     * 转义
     * @param type $oldStr
     * @param type $pinYinArr
     * @param type $isFirstWord 是否只需要第一个字母
     * @return string
     */
    private function trans($oldStr='',$pinYinArr=[],$isFirstWord=false) {
        $con = $this->mbStrSplit($oldStr);
        $str = '';
        for ($i=0;$i<count($con);$i++) {

            if (isset($pinYinArr[$con[$i]]) && $this->charCodeAt($con[$i]) > 200){
                $str .= $isFirstWord? strtoupper($pinYinArr[$con[$i]][0]):$pinYinArr[$con[$i]];
            }else {
                $str .= $isFirstWord?strtoupper($con[$i][0]):$con[$i];
            }

            $str .= $isFirstWord?'':' ';
        }
        return $str;
    }

    /**
     * 获取字符编码值
     * @param $char
     * @return null|number
     */
    private function charCodeAt($char)
    {
        if (mb_check_encoding($char, 'UTF-8'))
        {
            $ret = mb_convert_encoding($char, 'UTF-32BE', 'UTF-8');
            return hexdec(bin2hex($ret));
        }
        else
        {
            return null;
        }
    }

    /**
     * 拆分中英文
     * @param $str
     * @return array
     */
    private function mbStrSplit($str){
        return preg_split('/(?<!^)(?!$)/u', $str);
    }

    /**
     * 获取拼音大全
     * @return mixed
     */
    private function pinYin(){
        $pyDic = file_get_contents('pingyin.json');
        $returnArr = json_decode($pyDic,true);
        return $returnArr;
    }

}