// app/plugins/scroll-memory.client.ts
// 记录离开页面时的滚动位置，方便返回时恢复
import { useRouter } from 'vue-router'

const keyOf = (path: string) => `scroll:${path}`

export default defineNuxtPlugin(() => {
  if (process.server) return

  const router = useRouter()

  router.beforeEach((to, from) => {
    if (!from?.fullPath) return true
    try {
      const pos = { left: window.scrollX, top: window.scrollY }
      sessionStorage.setItem(keyOf(from.fullPath), JSON.stringify(pos))
    } catch (err) {
      console.warn('[scroll] pre-save failed', err)
    }
    return true
  })
})