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
  const preferredLanguage = request.cookies.get("preferred-language")?.value

  console.log("[middleware] ⏩ Incoming request")
  console.log("[middleware] → pathname:", pathname)
  console.log("[middleware] → preferred-language from cookie:", preferredLanguage)

  // ✅ 1. i18nRouter 优先处理
  const i18nResult = i18nRouter(request, i18nConfig)
  if (i18nResult) {
    console.log("[middleware] ✅ i18nRouter handled redirect")
    return i18nResult
  }

  // ✅ 2. 仅当不是 /[locale] 和 /[locale]/ 路径时才进行 cookie-based redirect
  const isOnlyLocale = i18nConfig.locales.some(locale => pathname === `/${locale}`)

  const hasLocalePrefix = i18nConfig.locales.some(
    locale => pathname.startsWith(`/${locale}/`) || pathname === `/${locale}`
  )
  console.log("[middleware] → hasLocalePrefix:", hasLocalePrefix)

  if (
    preferredLanguage &&
    !hasLocalePrefix &&
    !isOnlyLocale &&
    (i18nConfig.locales as readonly string[]).includes(preferredLanguage)
  ) {
    const url = request.nextUrl.clone()
    url.pathname = `/${preferredLanguage}${pathname}`
    console.log("[middleware] 🚀 Redirecting to preferred language:", url.pathname)
    return NextResponse.redirect(url)
  }

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

    const redirectToChat = session && 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) {
    console.error("[middleware] 💥 Exception:", e)
    return NextResponse.next({
      request: {
        headers: request.headers
      }
    })
  }
}

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