var fs = require('fs');
var chardet = require('chardet');
var jschardet = require("jschardet");
var encoding = require("encoding");

var path = "lua目录";

function readDirectory(dirPath) {
  if (fs.existsSync(dirPath)) {
    var files = fs.readdirSync(dirPath);

    files.forEach(function (file) {
      var filePath = dirPath + "/" + file;
      var stats = fs.statSync(filePath);

      if (stats.isDirectory()) {
        // console.log('/n读取目录：\n', filePath, "\n");
        readDirectory(filePath);
      } else if (stats.isFile() && /\.lua$/.test(filePath)) {
        var buff = fs.readFileSync(filePath);
        if (buff.length && buff[0].toString(16).toLowerCase() == "ef" && buff[1].toString(16).toLowerCase() == "bb" && buff[2].toString(16).toLowerCase() == "bf") {
          //EF BB BF 239 187 191
          console.log('\n发现BOM文件：', filePath, "\n");

          buff = buff.slice(3);
          fs.writeFile(filePath, buff.toString(), "utf8");
        }

        // { encoding: 'UTF-8', confidence: 0.99 }
        // var charset = chardet.detectFileSync(filePath);
        var info = jschardet.detect(buff);

        if (info.encoding == "GB2312" || info.encoding == "ascii") {
          var resultBuffer = encoding.convert(buff, "UTF-8", info.encoding);
          fs.writeFile(filePath, resultBuffer, "utf8");
        }
        else if (info.encoding != "UTF-8" && chardet.detectFileSync(filePath) != "UTF-8")
        {
          if (buff.toString().indexOf("\r\n") > -1)
          {
            var resultBuffer = encoding.convert(buff, "UTF-8", "GBK");
            fs.writeFile(filePath, resultBuffer, "utf8");
          }
        }
      }
    });

  } else {
    console.log('Not Found Path : ', dirPath);
  }
}

readDirectory(path);