import { useEffect } from 'react'
import NProgress from 'nprogress'
import 'nprogress/nprogress.css'
import './index.css'

// 配置 NProgress
NProgress.configure({
  showSpinner: false,
  minimum: 0.1,
  trickleSpeed: 200
})

export default function ProgressBar() {
  useEffect(() => {
    let lastHref = window.location.href

    const handleRouteChange = () => {
      NProgress.start()
      const timer = setTimeout(() => NProgress.done(), 100)
      return () => {
        clearTimeout(timer)
        NProgress.done()
      }
    }

    // 监听 href 变化
    const observer = new MutationObserver(() => {
      const currentHref = window.location.href
      if (currentHref !== lastHref) {
        lastHref = currentHref
        handleRouteChange()
      }
    })

    // 观察整个文档的变化
    observer.observe(document, {
      subtree: true,
      childList: true
    })

    // 监听 popstate 事件（处理浏览器前进后退）
    window.addEventListener('popstate', handleRouteChange)

    // 初始加载时触发一次
    handleRouteChange()

    // 清理监听器
    return () => {
      observer.disconnect()
      window.removeEventListener('popstate', handleRouteChange)
    }
  }, [])

  return null
}