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

import { Lang } from "@/constants/languages"
import { env } from "@/env/server"
import { internalServerError } from "@/server/errors/next"

import { signIn } from "@/auth"

export async function GET(
  request: NextRequest,
  context: { params: { lang: Lang } }
) {
  let redirectHeaders: Headers | undefined = undefined
  let redirectTo: string
  let nonce: string
  let value: string

  redirectTo =
    request.cookies.get("redirectTo")?.value || // Cookie gets set by authRequired middleware
    request.nextUrl.searchParams.get("redirectTo") ||
    "/"

  // Make relative URL to absolute URL
  if (redirectTo.startsWith("/")) {
    if (!env.PUBLIC_URL) {
      throw internalServerError("No value for env.PUBLIC_URL")
    }
    redirectTo = new URL(redirectTo, env.PUBLIC_URL).href
  }

  // Clean up cookie from authRequired middleware
  redirectHeaders = new Headers()
  redirectHeaders.append(
    "set-cookie",
    "redirectTo=; Expires=Thu, 01 Jan 1970 00:00:00 UTC; Path=/; HttpOnly; SameSite=Lax"
  )
  nonce = "" + request.nextUrl.searchParams.get("nonce")?.toString()
  value = "" + request.nextUrl.searchParams.get("nonce")?.toString()

  try {
    /**
     * 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
     */
    console.log({ login_redirectTo: redirectTo })
    let redirectUrl = await signIn(
      "curity",
      {
        redirectTo,
        redirect: false,
      },
      [
        ["ui_locales", context.params.lang],
        ["nonce", nonce],
        ["acr_values", "cat"],
      ]
    )

    if (redirectUrl) {
      return NextResponse.redirect(redirectUrl, {
        headers: redirectHeaders,
      })
    }
  } catch (error) {
    if (error instanceof AuthError) {
      console.error({ signInAuthError: error })
    } else {
      console.error({ signInError: error })
    }
  }

  return internalServerError()
}