import { createClient } from "@/lib/supabase/middleware"
import { i18nRouter } from "next-i18n-router"
import { NextResponse, type NextRequest } from "next/server"
import i18nConfig from "./i18nConfig"

export async function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl

  // ✅ 读取 cookie 中用户偏好的语言
  const preferredLanguage = request.cookies.get('preferred-language')?.value

  // ✅ 判断是否需要重定向到带有语言前缀的 URL
  const isMissingLocalePrefix = !i18nConfig.locales.some(locale =>
    pathname.startsWith(`/${locale}/`) || pathname === `/${locale}`
  )

  if (preferredLanguage && isMissingLocalePrefix) {
    const url = request.nextUrl.clone()
    url.pathname = `/${preferredLanguage}${pathname}`
    return NextResponse.redirect(url)
  }

  // ✅ 原始的 i18n 路由逻辑（保留）
  const i18nResult = i18nRouter(request, i18nConfig)
  if (i18nResult) return i18nResult

  try {
    const { supabase, response } = createClient(request)
    const session = await supabase.auth.getSession()

    const redirectToChat = session && request.nextUrl.pathname === "/"

    if (redirectToChat) {
      const { data: homeWorkspace, error } = await supabase
        .from("workspaces")
        .select("*")
        .eq("user_id", session.data.session?.user.id)
        .eq("is_home", true)
        .single()

      if (!homeWorkspace) throw new Error(error?.message)

      return NextResponse.redirect(
        new URL(`/${homeWorkspace.id}/chat`, request.url)
      )
    }

    return response
  } catch (e) {
    return NextResponse.next({
      request: { headers: request.headers }
    })
  }
}

export const config = {
  matcher: "/((?!api|static|.*\\..*|_next|auth).*)"
}