import chinese from './chinese'

const TRADITIONAL = chinese.Traditional //繁体
const SIMPLIFIED = chinese.Simplified //简体

export const chineseLanguageLoader = (loaderContext: string, options?: any) => {
  const modulesOptions = {
    language: 'zh-TW'
  }
  if (options && options.language && options.language === 'zh-CN') {
    modulesOptions.language = 'zh-CN'
  }
  return _transitionStr(loaderContext, modulesOptions.language)
}

function _transitionStr(str: string, language: string) {
  let i,
    letter,
    code,
    isChinese,
    index,
    src,
    des,
    result = ''
  if (language === 'zh-TW') {
    src = SIMPLIFIED
    des = TRADITIONAL
  } else {
    src = TRADITIONAL
    des = SIMPLIFIED
  }
  if (typeof str !== 'string') {
    return str
  }
  for (i = 0; i < str.length; i++) {
    letter = str.charAt(i)
    code = str.charCodeAt(i)
    isChinese = (code > 0x3400 && code < 0x9fc3) || (code > 0xf900 && code < 0xfa6a)
    if (!isChinese) {
      result += letter
      continue
    }
    index = src.indexOf(letter)

    if (index !== -1) {
      result += des.charAt(index)
    } else {
      result += letter
    }
  }

  return result
}