/**
 * 节点测活(适配 Surge/Loon 版)
 *
 * 说明: https://t.me/zhetengsha/1210
 *
 * 欢迎加入 Telegram 群组 https://t.me/zhetengsha
 *
 * 参数
 * - [timeout] 请求超时(单位: 毫秒) 默认 5000
 * - [retries] 重试次数 默认 1
 * - [retry_delay] 重试延时(单位: 毫秒) 默认 1000
 * - [concurrency] 并发数 默认 10
 * - [url] 检测的 URL. 需要 encodeURIComponent. 默认 http://connectivitycheck.platform.hicloud.com/generate_204
 * - [ua] 请求头 User-Agent. 需要 encodeURIComponent. 默认 Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Mobile/15E148 Safari/604.1
 * - [status] 合法的状态码的正则表达式. 需要 encodeURIComponent. 默认 204
 * - [method] 请求方法. 默认 head, 如果测试 URL 不支持, 可设为 get
 * - [show_latency] 显示延迟. 默认不显示. 注: 即使不开启这个参数, 节点上也会添加一个 _latency 字段
 * - [include_unsupported_proxy] 传递给运行环境时, 包含官方/商店版不支持的协议. 默认不包含. 若开启, 需要保证你的运行环境确实支持这些协议, 不然会报错
 * - [keep_incompatible] 保留当前客户端不兼容的协议. 默认不保留.
 * - [telegram_bot_token] Telegram Bot Token
 * - [telegram_chat_id] Telegram Chat ID
 * - [cache] 使用缓存, 默认不使用缓存
 * - [disable_failed_cache/ignore_failed_error] 禁用失败缓存. 即不缓存失败结果
 * 关于缓存时长
 * 当使用相关脚本时, 若在对应的脚本中使用参数(⚠ 别忘了这个, 一般为 cache, 值设为 true 即可)开启缓存
 * 可在前端(>=2.16.0) 配置各项缓存的默认时长
 * 持久化缓存数据在 JSON 里
 * 可以在脚本的前面添加一个脚本操作, 实现保留 1 小时的缓存. 这样比较灵活
 * async function operator() {
 *     scriptResourceCache._cleanup(undefined, 1 * 3600 * 1000);
 * }
 */

async function operator() {
  scriptResourceCache._cleanup(undefined, 1 * 3600 * 1000);
}

async function operator(proxies = [], targetPlatform, env) {
  const $ = $substore

  // 目标代理客户端执行列表，支持 SurgeMac 和 Loon，其他客户端默认跳过
  const targetPlatforms = ['SurgeMac', 'Loon']
  if (targetPlatform && !targetPlatforms.some(p => p.toLowerCase() === targetPlatform.toLowerCase())) {
    $.info(`当前目标客户端为 ${targetPlatform}，不在执行列表 [${targetPlatforms.join(', ')}] 中，跳过测活脚本并直接返回节点`)
    return proxies
  }

  const { isLoon, isSurge } = $.env
  if (!isLoon && !isSurge) throw new Error('仅支持 Loon 和 Surge(ability=http-client-policy)')
  const telegram_chat_id = $arguments.telegram_chat_id
  const telegram_bot_token = $arguments.telegram_bot_token
  const cacheEnabled = $arguments.cache
  const disableFailedCache = $arguments.disable_failed_cache || $arguments.ignore_failed_error
  const cache = scriptResourceCache
  const method = $arguments.method || 'head'
  const keepIncompatible = $arguments.keep_incompatible
  const includeUnsupportedProxy = $arguments.include_unsupported_proxy
  const validStatus = new RegExp($arguments.status || '204')
  const url = decodeURIComponent($arguments.url || 'http://connectivitycheck.platform.hicloud.com/generate_204')
  const ua = decodeURIComponent(
    $arguments.ua ||
      'Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Mobile/15E148 Safari/604.1'
  )
  const target = isLoon ? 'Loon' : isSurge ? 'Surge' : undefined
  const validProxies = []
  const incompatibleProxies = []
  const failedProxies = []
  let name = ''
  for (const [key, value] of Object.entries(env.source)) {
    if (!key.startsWith('_')) {
      name = value.displayName || value.name
      break
    }
  }
  if (!name) {
    const collection = env.source._collection
    name = collection.displayName || collection.name
  }

  const concurrency = parseInt($arguments.concurrency || 10) // 一组并发数
  await executeAsyncTasks(
    proxies.map(proxy => () => check(proxy)),
    { concurrency }
  )

  // const batches = []
  // for (let i = 0; i < proxies.length; i += concurrency) {
  //   const batch = proxies.slice(i, i + concurrency)
  //   batches.push(batch)
  // }
  // for (const batch of batches) {
  //   await Promise.all(batch.map(check))
  // }

  if (telegram_chat_id && telegram_bot_token && failedProxies.length > 0) {
    const text = `\`${name}\` 节点测试:\n${failedProxies
      .map(proxy => `❌ [${proxy.type}] \`${proxy.name}\``)
      .join('\n')}`
    await http({
      method: 'post',
      url: `https://api.telegram.org/bot${telegram_bot_token}/sendMessage`,
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ chat_id: telegram_chat_id, text, parse_mode: 'MarkdownV2' }),
      retries: 0,
      timeout: 5000,
    })
  }

  return validProxies

  async function check(proxy) {
    // $.info(`[${proxy.name}] 检测`)
    // $.info(`检测 ${JSON.stringify(proxy, null, 2)}`)
    const id = cacheEnabled
      ? `availability:${url}:${method}:${validStatus}:${JSON.stringify(
          Object.fromEntries(
            Object.entries(proxy).filter(([key]) => !/^(name|collectionName|subName|id|_.*)$/i.test(key))
          )
        )}`
      : undefined
    // $.info(`检测 ${id}`)
    try {
      const node = ProxyUtils.produce([proxy], target, undefined, {
        'include-unsupported-proxy': includeUnsupportedProxy,
      })
      if (node) {
        const cached = cache.get(id)
        if (cacheEnabled && cached) {
          if (cached.latency) {
            validProxies.push({
              ...proxy,
              name: `${$arguments.show_latency ? `[${cached.latency}] ` : ''}${proxy.name}`,
              _latency: cached.latency,
            })
            $.info(`[${proxy.name}] 使用成功缓存`)
            return
          } else if (disableFailedCache) {
            $.info(`[${proxy.name}] 不使用失败缓存`)
          } else {
            $.info(`[${proxy.name}] 使用失败缓存`)
            return
          }
        }
        // 请求
        const startedAt = Date.now()
        const res = await http({
          method,
          headers: {
            'User-Agent': ua,
          },
          url,
          'policy-descriptor': node,
          node,
        })
        const status = parseInt(res.status || res.statusCode || 200)
        let latency = ''
        latency = `${Date.now() - startedAt}`
        $.info(`[${proxy.name}] status: ${status}, latency: ${latency}`)
        // 判断响应
        if (validStatus.test(status)) {
          validProxies.push({
            ...proxy,
            name: `${$arguments.show_latency ? `[${latency}] ` : ''}${proxy.name}`,
            _latency: latency,
          })
          if (cacheEnabled) {
            $.info(`[${proxy.name}] 设置成功缓存`)
            cache.set(id, { latency })
          }
        } else {
          if (cacheEnabled) {
            $.info(`[${proxy.name}] 设置失败缓存`)
            cache.set(id, {})
          }
          failedProxies.push(proxy)
        }
      } else {
        if (keepIncompatible) {
          validProxies.push(proxy)
        }
        incompatibleProxies.push(proxy)
      }
    } catch (e) {
      $.error(`[${proxy.name}] ${e.message ?? e}`)
      if (cacheEnabled) {
        $.info(`[${proxy.name}] 设置失败缓存`)
        cache.set(id, {})
      }
      failedProxies.push(proxy)
    }
  }
  // 请求
  async function http(opt = {}) {
    const METHOD = opt.method || 'get'
    const TIMEOUT = parseFloat(opt.timeout || $arguments.timeout || 5000)
    const RETRIES = parseFloat(opt.retries ?? $arguments.retries ?? 1)
    const RETRY_DELAY = parseFloat(opt.retry_delay ?? $arguments.retry_delay ?? 1000)

    let count = 0
    const fn = async () => {
      try {
        return await $.http[METHOD]({ ...opt, timeout: TIMEOUT })
      } catch (e) {
        // $.error(e)
        if (count < RETRIES) {
          count++
          const delay = RETRY_DELAY * count
          // $.info(`第 ${count} 次请求失败: ${e.message || e}, 等待 ${delay / 1000}s 后重试`)
          await $.wait(delay)
          return await fn()
        } else {
          throw e
        }
      }
    }
    return await fn()
  }
  function executeAsyncTasks(tasks, { wrap, result, concurrency = 1 } = {}) {
    return new Promise(async (resolve, reject) => {
      try {
        let running = 0
        const results = []

        let index = 0

        function executeNextTask() {
          while (index < tasks.length && running < concurrency) {
            const taskIndex = index++
            const currentTask = tasks[taskIndex]
            running++

            currentTask()
              .then(data => {
                if (result) {
                  results[taskIndex] = wrap ? { data } : data
                }
              })
              .catch(error => {
                if (result) {
                  results[taskIndex] = wrap ? { error } : error
                }
              })
              .finally(() => {
                running--
                executeNextTask()
              })
          }

          if (running === 0) {
            return resolve(result ? results : undefined)
          }
        }

        await executeNextTask()
      } catch (e) {
        reject(e)
      }
    })
  }
}