import { onMounted, onBeforeUnmount } from 'vue'

/**
 * 数据轮询 composable
 * @param {Function} fetchFn - 数据获取函数
 * @param {Object} options - 配置选项
 * @param {number} options.interval - 轮询间隔（毫秒），默认 60000（60秒）
 * @param {boolean} options.immediate - 是否立即执行一次，默认 true
 * @returns {Object} { start, stop, isPolling }
 */
export function usePolling(fetchFn, options = {}) {
  const {
    interval = 60000,
    immediate = true
  } = options

  let pollingTimer = null
  const isPolling = { value: false }

  const start = () => {
    if (pollingTimer) return
    
    if (immediate) {
      fetchFn()
    }
    
    pollingTimer = setInterval(() => {
      fetchFn()
    }, interval)
    
    isPolling.value = true
  }

  const stop = () => {
    if (pollingTimer) {
      clearInterval(pollingTimer)
      pollingTimer = null
    }
    isPolling.value = false
  }

  // 组件挂载时自动启动
  onMounted(() => {
    start()
  })

  // 组件卸载时自动停止
  onBeforeUnmount(() => {
    stop()
  })

  return {
    start,
    stop,
    isPolling
  }
}

/**
 * 多函数轮询 composable
 * @param {Function[]} fetchFns - 数据获取函数数组
 * @param {Object} options - 配置选项
 * @param {number} options.interval - 轮询间隔（毫秒），默认 60000（60秒）
 * @param {boolean} options.immediate - 是否立即执行一次，默认 true
 * @returns {Object} { start, stop, isPolling }
 */
export function usePollingMultiple(fetchFns, options = {}) {
  const {
    interval = 60000,
    immediate = true
  } = options

  let pollingTimer = null
  const isPolling = { value: false }

  const fetchAll = () => {
    fetchFns.forEach(fn => {
      if (typeof fn === 'function') {
        fn()
      }
    })
  }

  const start = () => {
    if (pollingTimer) return
    
    if (immediate) {
      fetchAll()
    }
    
    pollingTimer = setInterval(() => {
      fetchAll()
    }, interval)
    
    isPolling.value = true
  }

  const stop = () => {
    if (pollingTimer) {
      clearInterval(pollingTimer)
      pollingTimer = null
    }
    isPolling.value = false
  }

  // 组件挂载时自动启动
  onMounted(() => {
    start()
  })

  // 组件卸载时自动停止
  onBeforeUnmount(() => {
    stop()
  })

  return {
    start,
    stop,
    isPolling
  }
}