var childproc = require('child_process');
const util = require('util');
const exec = util.promisify(require('child_process').exec);
const querystring = require('querystring');
var settings=require("../../config/settings");
class RestClient{
    constructor(){
      this.cmdGetPattern = "curl {-G} -k  -d '{data}' {url}";
      this.cmdPostPattern="curl -k -H 'Content-type: application/json' -d '{data}' '{url}'";

      this.cmdPostPatternWithAK="curl -k -H 'Content-type: application/json'  -H  'AccessKey:{ak}'   -d '{data}' {url}";

      this.cmdDownLoadFilePattern="curl -G -o {fileName} {url}";
      this.cmdPostPattern2="curl -k -H 'Content-type: application/x-www-form-urlencoded'  -d '{data}' {url}";
     
      // form-data形式post  data参数类型 md5=2&data=1
      this.cmdPostPattern5="curl -k --data '{data}' {url}";

    }
    FetchGetCmd(subData, url) {
  		var cmd = this.cmdGetPattern.replace(/\{\-G\}/g, "-G").replace(
  				/\{data\}/g, subData).replace(/\{url\}/g, url);
  		return cmd;
  	}
    FetchPostCmd(subData, url) {
  		var data=JSON.stringify(subData);
  		var cmd= this.cmdPostPattern.replace(/\{data\}/g,
  				data).replace(/\{url\}/g, url);
  		return cmd;
    }
    FetchPostCmdWithAK(subData, url,acck) {
  		var data=JSON.stringify(subData);
  		var cmd= this.cmdPostPatternWithAK.replace(/\{data\}/g,
  				data).replace(/\{url\}/g, url).replace(/\{ak\}/g,acck);
  		return cmd;
  	}
    FetchPostCmd2(subData, url) {
  		var data=subData;
  		var cmd= this.cmdPostPattern2.replace(/\{data\}/g,
  				data).replace(/\{url\}/g, url);
  		return cmd;
  	}
    FetchPostCmd3(subData, url) {
  		var data=subData;
  		var cmd= this.cmdPostPattern3.replace(/\{data\}/g,
  				data).replace(/\{url\}/g, url);
  		return cmd;
    }
    FetchGetCmd3(url) {
      var cmd = this.cmdGetPattern3.replace(/\{\-G\}/g, "-G").replace(/\{url\}/g, url);
      return cmd;
    }
    FetchPostCmd4(subData, url) {
      var data=subData;
      var cmd= this.cmdPostPattern4.replace(/\{data\}/g,
          data).replace(/\{url\}/g, url);
      return cmd;
    }
    FetchPostCmd5(subData, url) {
      var data=subData;
      var cmd= this.cmdPostPattern5.replace(/\{data\}/g,
          data).replace(/\{url\}/g, url);
      return cmd;
    }
    FetchDownLoadCmd(outfname,url) {
  		// console.log(this.cmdPattern);
  		var cmd = this.cmdDownLoadFilePattern.replace(/\{fileName\}/g, outfname).replace(
  				/\{url\}/g, url);
  		return cmd;
  	}
    async exec(cmd,options) {
        //await后面表达式返回的promise对象，是then的语法糖，await返回then函数的返回值
        //异常需要try/catch自己捕获或外部catch捕获
        if(options){
          const { stdout, stderr } = await exec(cmd,options);
          return { stdout, stderr };
        }else{
          const { stdout, stderr } = await exec(cmd);
          return { stdout, stderr };
        }
    }
    async execDownload(url,outfname){
      let cmd=this.FetchDownLoadCmd(outfname,url);
      var result=await this.exec(cmd);
      return result;
    }
    async execGet(subData, url){
      let cmd=this.FetchGetCmd(subData,url);
      var result=await this.exec(cmd);
      return result;
    }
    async execGet2(subData, url){
      var data=querystring.stringify(subData);
      let cmd=this.FetchGetCmd(data,url);
      var result=await this.exec(cmd);
      return result;
    }
    async execPost(subData, url){
      let cmd=this.FetchPostCmd(subData,url);
      var result=await this.exec(cmd,{
        maxBuffer: 10000 * 1024
      });
      return result;
    }
    async execPostWithAK(subData, url,ak){
      let cmd=this.FetchPostCmdWithAK(subData,url,ak);
      var result=await this.exec(cmd,{
        maxBuffer:1024*1024*15
      });
      var rtn=result.stdout;
      if(rtn){
        return JSON.parse(rtn);
      }else{
        return null;
      }
    }
    async execPost2(subData, url){
      let cmd=this.FetchPostCmd2(subData,url);
      console.log(cmd);
      var result=await this.exec(cmd);
      return result;
    }
    async execPost3(subData, url){
      let cmd=this.FetchPostCmd3(subData,url);
      console.log(cmd);
      var result=await this.exec(cmd);
      return result;
    }
    async execGet3(url){
      let cmd=this.FetchGetCmd3(url);
      console.log("execGet3-----01");
      console.log(cmd);
      var result=await this.exec(cmd);
      return result;
    }
    async execPostESignBao(subData, url){
      let cmd=this.FetchPostCmd4(subData,url);
      console.log(cmd);
      var result=await this.exec(cmd);
      return result;
    }
    async execPostForm(subData, url){
      let cmd=this.FetchPostCmd5(subData,url);
      console.log(cmd);
      var result=await this.exec(cmd);
      return result;
    }
    async execCustomPostESignBao(cmd){
      console.log(cmd);
      var result=await this.exec(cmd);
      return result;
    }
    test(){
      console.log("hello");
    }
}
module.exports=RestClient;
// var x=new RestClient();
// x.execGet("","http://www.163.com").then(function(r){
//   console.log(r.stdout);
//   console.log(r.stderr);
// });
