import { StartClient } from "@tanstack/react-start/client"
import { useEffect, useState } from "react"
import { hydrateRoot } from "react-dom/client"
import { registerSW } from "virtual:pwa-register"

import { PwaUpdateToast } from "@/components/PwaUpdateToast"

// Prompt-mode PWA: vite-plugin-pwa still generates a SW that precaches the
// production bundle, but it does not force skipWaiting/clientsClaim. Instead,
// the new SW waits until the user accepts the update, so open dashboard tabs
// are not reloaded mid-session. This protects in-flight agent runs and any
// unsaved text in the compose box. Skip in dev — the SW precaches production-only
// build artifacts that 404 against the dev server.
function PwaUpdateProvider() {
  const [needRefresh, setNeedRefresh] = useState(false)
  const [updateSW, setUpdateSW] = useState<(() => Promise<void>) | undefined>(undefined)

  useEffect(() => {
    if (!import.meta.env.PROD) return
    const updateSWRef = registerSW({
      onNeedRefresh() {
        setNeedRefresh(true)
      },
    })
    setUpdateSW(() => updateSWRef)
  }, [])

  return (
    <PwaUpdateToast
      needRefresh={needRefresh}
      updateServiceWorker={updateSW}
    />
  )
}

hydrateRoot(
  document,
  <>
    <StartClient />
    <PwaUpdateProvider />
  </>
)