import { type NextRequest, NextResponse } from "next/server"
import { AuthError } from "next-auth"

import { Lang } from "@scandic-hotels/common/constants/language"
import { logger } from "@scandic-hotels/common/logger"
import { isValidLang } from "@scandic-hotels/common/utils/languages"

import { env } from "@/env/server"
import { internalServerError } from "@/server/errors/next"
import { getPublicURL } from "@/server/utils"

import { signOut } from "@/auth"

export async function GET(
  request: NextRequest,
  context: RouteContext<"/[lang]/logoutSafely">
) {
  const publicURL = getPublicURL(request)
  const params = await context.params
  const lang = isValidLang(params.lang) ? params.lang : Lang.en
  const redirectToSearchParamValue =
    request.nextUrl.searchParams.get("redirectTo")
  const redirectToFallback = `/${lang}`

  let redirectTo: string = redirectToSearchParamValue || redirectToFallback

  // Make relative URL to absolute URL
  if (redirectTo.startsWith("/")) {
    redirectTo = new URL(redirectTo, publicURL).href
  }

  try {
    redirectTo = `${env.CURITY_ISSUER_USER}/authn/authenticate/logout?redirect_uri=${encodeURIComponent(redirectTo)}`
    logger.debug(`[logoutSafely] final redirectUrl: ${redirectTo}`)

    const redirectUrlObj = await signOut({
      redirectTo,
      redirect: false,
    })

    return NextResponse.redirect(redirectUrlObj.redirect)
  } catch (error) {
    if (error instanceof AuthError) {
      logger.error("signOutSafelyAuthError", { signOutAuthError: error })
    } else {
      logger.error("signOutSafelyError", { signOutError: error })
    }
  }

  return internalServerError()
}