import { NextApiRequest, NextApiResponse } from "next"
import { OUR_DOMAIN } from "~/lib/env"
import { cacheGet } from "~/lib/redis.server"

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse,
) {
  let { host } = req.query

  let realHost: string
  if (Array.isArray(host)) {
    realHost = host[0]
  } else {
    realHost = host || ""
  }
  let result = {}

  const OUR_DOMAIN_SUFFIX = `.${OUR_DOMAIN}`
  if (realHost && realHost !== OUR_DOMAIN) {
    result = await cacheGet(["host2handle", realHost], async () => {
      if (realHost.endsWith(OUR_DOMAIN_SUFFIX)) {
        const subdomain = realHost.replace(OUR_DOMAIN_SUFFIX, "")
        const res = await fetch(
          `https://indexer.crossbell.io/v1/handles/${subdomain}/character`,
        )
        const char = await res.json()
        const customDomain =
          char?.metadata?.content?.attributes?.find(
            (a: any) => a.trait_type === "xlog_custom_domain",
          )?.value || ""
        if (customDomain) {
          return {
            redirect: /^https?:\/\//.test(customDomain)
              ? customDomain
              : `https://${customDomain}`,
            subdomain: subdomain,
          }
        } else {
          return {
            subdomain: subdomain,
          }
        }
      } else {
        const res = await fetch(
          `https://cloudflare-dns.com/dns-query?name=_xlog-challenge.${realHost}&type=TXT`,
          {
            headers: {
              accept: "application/dns-json",
            },
          },
        )
        const txt = await res.json()
        const tenant = txt?.Answer?.[0]?.data.replace(/^"|"$/g, "")
        return {
          subdomain: tenant,
        }
      }
    })
  }

  res.status(200).json(result)
}