import { auth, get, isLiquid, post } from "$lib/utils";
import bip21 from "bip21";
import { validate } from "bitcoin-address-validation";
import { PUBLIC_DOMAIN } from "$env/static/public";
import { redirect } from "@sveltejs/kit";

export default async (t, host, cookies) => {
  if (!t) return;

  if (t.startsWith("http")) redirect(307, t);
  if (t.startsWith(host)) redirect(307, `http://${t}`);

  let amount, id, user;

  t = t.trim();
  t.toLowerCase().startsWith("bitcoin:") &&
    ({
      address: t,
      options: { amount },
    } = bip21.decode(t));

  if (t.startsWith("lightning:")) t = t.replace("lightning:", "");
  if (t.endsWith(`@${PUBLIC_DOMAIN}`)) t = t.split("@")[0];
  if (t.includes("@") && t.includes(".")) {
    try {
      t = await get(`/encode?address=${t}`);
    } catch (e) {}
  }

  if (t.includes("/fund")) redirect(307, t.substring(t.indexOf("/fund")));

  // lightning
  if (t.toLowerCase().startsWith("lightning:"))
    t = t.toLowerCase().replace("lightning:", "");
  if (t.toLowerCase().startsWith("lnurl")) redirect(307, `/ln/${t}`);
  if (t.includes(":")) t = t.split(":")[1];

  if (t.toLowerCase().startsWith("ln")) {
    try {
      ({ id } = await get(`/invoice/${t}`));
    } catch (e) {
      redirect(307, `/send/lightning/${t}`);
    }
  }

  // bitcoin
  if (validate(t) || isLiquid(t)) {
    try {
      ({ id, user } = await get(`/invoice/${t}`));
    } catch (e) {
      let r = `/send/bitcoin/${t}`;
      if (amount) r += "/" + amount;
      redirect(307, r);
    }

    if (user) redirect(307, `/pay/${user.username}`);
    else if (id) redirect(307, `/send/${id}`);
  }

  let claimed;
  if (t.toLowerCase().startsWith("cashu")) {
    try {
      claimed = await post(`/claim`, { token: t }, auth(cookies));
      claimed = { ok: true };
    } catch (e) {
      return e.message;
    }
    if (claimed.ok) {
      redirect(307, `/${cookies.get("username")}/payments`);
    }
  }

  // user
  try {
    user = await get(`/users/${t.split("/")[0]}`);
    if (user.anon) user = null;
  } catch (e) {}

  if (user) redirect(307, `/pay/${t}`);

  let fund;
  try {
    fund = await get(`/fund/${t}`);
  } catch (e) {}

  if (fund) redirect(307, `/send/fund/${t}`);

  // invoice
  let invoice;
  try {
    invoice = await get(`/invoice/${t}`);
  } catch (e) {}

  if (invoice) redirect(307, `/send/invoice/${invoice.id}`);
};