// hook/useGlobalInactivity.js
import {
    onMounted,
    onUnmounted
} from 'vue'

export function useGlobalInactivity(callback, timeout = 60000) {
    let timer = null
    let isPaused = false

    // ===== 高频事件节流 =====
    let lastActivityTime = 0
    const THROTTLE_DELAY = 300 // 300ms 内最多响应一次活动

    const handleUserActivity = () => {
        const now = Date.now()
        if (now - lastActivityTime > THROTTLE_DELAY) {
            lastActivityTime = now
            resetTimer()
        }
    }

    // 低频事件（可直接绑定）
    const lowFreqEvents = ['mousedown', 'click', 'keydown', 'touchstart']
    // 高频事件（需节流）
    const highFreqEvents = ['mousemove', 'scroll', 'wheel', 'pointermove']

    const resetTimer = () => {
        if (isPaused) return
        if (timer) clearTimeout(timer)
        timer = setTimeout(() => {
            callback()
            pause() // 默认触发后停止
        }, timeout)
    }

    const pause = () => {
        isPaused = true
        if (timer) {
            clearTimeout(timer)
            timer = null
        }
        lowFreqEvents.forEach(e => document.removeEventListener(e, resetTimer, true))
        highFreqEvents.forEach(e => document.removeEventListener(e, handleUserActivity, true))
        document.removeEventListener('visibilitychange', handleVisibilityChange)
    }

    const resume = () => {
        if (!isPaused) return
        isPaused = false
        resetTimer()
        lowFreqEvents.forEach(e => document.addEventListener(e, resetTimer, true))
        highFreqEvents.forEach(e => document.addEventListener(e, handleUserActivity, true))
        document.addEventListener('visibilitychange', handleVisibilityChange)
    }

    const handleVisibilityChange = () => {
        if (document.hidden) {
            pause()
        } else {
            resume()
        }
    }

    const start = () => {
        if (isPaused) return
        resetTimer()
        lowFreqEvents.forEach(e => document.addEventListener(e, resetTimer, true))
        highFreqEvents.forEach(e => document.addEventListener(e, handleUserActivity, true))
        document.addEventListener('visibilitychange', handleVisibilityChange)
    }

    onMounted(start)
    onUnmounted(pause)

    return {
        resume,
        pause
    }
}