const parser = require('dicom-parser');
const fsp = require('fs-promise');
const iconv = require("iconv-lite")

const filePath = '/Users/fuyu/Downloads/CgocGF1Cuu2AMYb5AIEtSKYTE8Q756.dcm';
let test = async url => {
  const fileBuffer = await fsp.readFile(url);
  const dataSet = parser.parseDicom(fileBuffer);
  const charset = getCharSet(dataSet)
  const originalString = dataSet.string;
  dataSet.string = (tag, index) => {
    let value = originalString.call(dataSet, tag, index);
    if (value != null && value != 'undefined') {
      console.log('charset', charset)
      let _value = iconv.decode(value, 'UTF-8');
      // console.log()
      if (_value != null && _value != 'undefined') {
        return _value.replace(/['^']+/g, '')
      }
      return _value;
    } else {
      return value;
    }
  };
  let text = dataSet.string('x0008103e')
  console.log(text, iconv.decode(text, 'ISO_IR 100'))
}

const chatSetMap = {
  'ISO_IR 6': 'UTF-8',
  'ISO_IR 192': 'UTF-8',
  'ISO_IR 100': 'ISO-8859-1',
  'ISO_IR 101': 'ISO-8859-2',
  'ISO_IR 109': 'ISO-8859-3',
  'ISO_IR 110': 'ISO-8859-4',
  'ISO_IR 144': 'ISO-8859-5',
  'ISO_IR 127': 'ISO-8859-6',
  'ISO_IR 126': 'ISO-8859-7',
  'ISO_IR 138': 'ISO-8859-8',
  'ISO_IR 148': 'ISO-8859-9',
}
const getCharSet = dataSet => {
    let specificCharacterSet = dataSet.string('x00080005');
    let charset = 'GB2312'
    console.log('specificCharacterSet', specificCharacterSet)
    if (specificCharacterSet) {
      charset = chatSetMap[specificCharacterSet] || charset
    }
    return charset
  }
  // GB2312
  // //xml文件编码方式，以支持中文显示。
  // if (!csetString.empty())
  // 	encString = "GB2312";

test(filePath)