import {
  getEncryptToBase64 as encrypt,
  getDecryptByBase64 as decrypt,
} from './encryption'
const encodeReserveRE = /[!'()*]/g
const encodeReserveReplacer = (c) => '%' + c.charCodeAt(0).toString(16) //获取该字符的 ASCII 码值，再将其转换为十六进制字符串，并在前面加上 '%' 作为替换后的结果
const commaRE = /%2C/g //英文逗号处理
 
const encode = (str) =>
  encodeURIComponent(str)
    .replace(encodeReserveRE, encodeReserveReplacer)
    .replace(commaRE, ',')
 
const decode = decodeURIComponent
 
/**
 * 判断字符串是否是base64
 * @param { string } str
 * @returns { boolean }
 */
function isBase64(str) {
  // 检查字符串是否为空或仅包含空白字符
  if (!str || str.trim() === '') {
    return false
  }
  // 正则表达式匹配Base64的字符集，允许末尾有0-2个等号用于填充
  const base64Pattern = /^[A-Za-z0-9+/]*={0,2}$/
 
  // 首先检查字符串是否符合Base64的字符集规范
  if (!base64Pattern.test(str)) {
    return false
  }
 
  try {
    return btoa(atob(str)) === str
  } catch (err) {
    return false
  }
}
 
/**
 * 序列化对象 并加密
 * @param {Object} obj
 */
export const stringifyQuery = (obj) => {
  const res = obj
    ? Object.keys(obj)
        .map((key) => {
          const val = obj[key]
          if (val === null || val === undefined) {
            return encode(key)
          }
          if (Array.isArray(val)) {
            const result = []
            val.forEach((val2) => {
              if (val2 === null || val2 === undefined) {
                result.push(encode(key))
              } else {
                result.push(encode(key) + '=' + encode(val2))
              }
            })
            return result.join('&')
          }
 
          return encode(key) + '=' + encode(val)
        })
        .join('&')
    : null
  return res ? `?${encrypt(res)}` : ''
}
 
/**
 * 解密  反序列化字符串参数
 * @param {String}} query
 */
export const parseQuery = (query) => {
  const res = {}
 
  query = query.trim().replace(/^(\?|#|&)/, '')
  if (!query) {
    return res
  }
  // 解密
  query = isBase64(query) ? decrypt(query) : query
  query.split('&').forEach((param) => {
    const parts = param.split('=')
    const key = decode(parts.shift())
    const val = parts.length > 0 ? decode(parts.join('')) : null
    if (res[key] === undefined) {
      res[key] = val
    } else if (Array.isArray(res[key])) {
      res[key].push(val)
    } else {
      // 复原数组
      res[key] = [res[key], val]
    }
  })
  return res
}