// https://docs.cfw.lbyczf.com/contents/parser.html#%E8%BF%9B%E9%98%B6%E6%96%B9%E6%B3%95-javascript
let proxyGroupName = ''
let directGroupName = ''
module.exports.parse = async(raw, utils, meta) => {
  const { axios, yaml, notify, console } = utils
  const { name, url, interval, selected } = meta
  const obj = yaml.parse(raw)
  try {
    await configPrependRules(utils, obj)
  } catch (e) {
    throw new Error(e)
  }
  return yaml.stringify(obj)
}

// 配置预先规则
async function configPrependRules(utils, obj) {
  const { axios } = utils
  proxyGroupName = getProxyGroupName(obj)
  directGroupName = getDirectGroupName(obj)
  try {
    const noCacheDate = '?nocachekey=' + Date.now()
    const directResponse = await axios.get('https://git.yevpt.com/vpt/public-data/raw/branch/master/direct' + noCacheDate)
    const directs = directResponse.data
    const prependDirectRules = directs.split('\n').map(item => getRuleItem(item, true))
    const proxyResponse = await axios.get('https://git.yevpt.com/vpt/public-data/raw/branch/master/proxy' + noCacheDate)
    const proxys = proxyResponse.data
    const prependProxyRules = proxys.split('\n').map(item => getRuleItem(item, false))
    const prependRules = [...prependDirectRules, ...prependProxyRules]
    obj.rules = [...prependRules, ...obj.rules]
  } catch (e) {
    throw new Error(e)
  }
}

function getRuleItem(match, direct) {
  const groupName = direct ? directGroupName : proxyGroupName
  if (isIPAddress(match)) {
    return `IP-CIDR,${match}/24,${groupName},no-resolve`
  } else {
    return `DOMAIN-SUFFIX,${match},${proxyGroupName}`
  }
}

// 获取代理组的名称
function getProxyGroupName(obj) {
  const nodeSelectName = obj['proxy-groups'].find(item => ['节点选择', 'Proxies'].some(name => item.name.includes(name)))
  if (nodeSelectName) {
    return nodeSelectName.name
  }
  return obj['proxy-groups'].find(item => item.name.includes('手动切换')).name
}

// 获取直连组的名称
function getDirectGroupName(obj) {
  const nodeSelectName = obj['proxy-groups'].find(item => ['全球直连'].some(name => item.name.includes(name)))
  if (nodeSelectName) {
    return nodeSelectName.name
  }
  return 'DIRECT'
}

function isIPAddress(str) {
  const ipv4Regex = /^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.((25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.){2}(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)$/
  const ipv6Regex = /^([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}$|^([0-9a-fA-F]{1,4}:){1,7}:$|^([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}$|^([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}$|^([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}$|^([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}$|^([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}$|^[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})?$/
  return ipv4Regex.test(str) || ipv6Regex.test(str)
}