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

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

import { signIn } from "@/auth"

import type { Lang } from "@/constants/languages"

export async function GET(
  request: NextRequest,
  context: { params: { lang: Lang } }
) {
  const publicURL = getPublicURL(request)

  const loginKey = request.nextUrl.searchParams.get("loginKey")
  if (!loginKey) {
    console.log(
      `[verifymagiclink] missing required loginKey, aborting bad request`
    )
    return badRequest()
  }

  let redirectTo: string

  console.log(`[verifymagiclink] verifying callback`)

  const redirectToCookieValue = request.cookies.get(
    "magicLinkRedirectTo"
  )?.value // Set redirect url from the magicLinkRedirect Cookie which is set when intiating login
  const redirectToFallback = "/"

  console.log(
    `[verifymagiclink] magicLinkRedirectTo cookie value: ${redirectToCookieValue}`
  )

  redirectTo = redirectToCookieValue || redirectToFallback

  // Make relative URL to absolute URL
  if (redirectTo.startsWith("/")) {
    console.log(
      `[verifymagiclink] make redirectTo absolute, from ${redirectTo}`
    )
    redirectTo = new URL(redirectTo, publicURL).href
    console.log(`[verifymagiclink] make redirectTo absolute, to ${redirectTo}`)
  }

  // Update Seamless login url as Magic link login has a different authenticator in Curity
  redirectTo = redirectTo.replace("updatelogin", "updateloginemail")

  try {
    console.log(`[verifymagiclink] final redirectUrl: ${redirectTo}`)

    /**
     * Passing `redirect: false` to `signIn` will return the URL instead of
     * automatically redirecting to it inside of `signIn`.
     * https://github.com/nextauthjs/next-auth/blob/3c035ec/packages/next-auth/src/lib/actions.ts#L76
     */
    const redirectUrl = await signIn(
      "curity",
      {
        redirectTo,
        redirect: false,
      },
      {
        ui_locales: context.params.lang,
        scope: ["openid", "profile"].join(" "),
        loginKey: loginKey,
        for_origin: publicURL,
        acr_values: "urn:com:scandichotels:scandic-email",
        version: "2",
      }
    )

    if (redirectUrl) {
      console.log(`[verifymagiclink] redirecting to: ${redirectUrl}`)
      return NextResponse.redirect(redirectUrl)
    } else {
      console.error(
        `[verifymagiclink] missing redirectUrl reponse from signIn()`
      )
    }
  } catch (error) {
    if (error instanceof AuthError) {
      console.error({ signInAuthError: error })
    } else {
      console.error({ signInError: error })
    }
  }

  return internalServerError()
}