import config from "$config";
import { g, s } from "$lib/db";
import { lnb } from "$lib/ln";
import { fail, wait } from "$lib/utils";
import {
  CashuMint,
  CashuWallet,
  MintQuoteState,
  getDecodedToken,
  getEncodedToken,
  getEncodedTokenV4,
} from "@cashu/cashu-ts";

const m = new CashuMint(config.mintUrl);
const w = new CashuWallet(m);

const enc = (proofs, v = 4) =>
  (v === 4 ? getEncodedTokenV4 : getEncodedToken)({
    token: [{ mint: config.mintUrl, proofs }],
  });

const dec = (token) => getDecodedToken(token).token[0];

const ext = async (mint) => {
  const issuer = new CashuMint(mint);
  const { pubkey: issuerPk } = await issuer.getInfo();
  const { pubkey: ourPk } = await m.getInfo();
  return issuerPk !== ourPk;
};

export async function get(id, v = 4) {
  const token = await g(`cash:${id}`);
  if (v < 4) return enc(dec(token).proofs, 3);
  return token;
}

export async function claim(token) {
  const { proofs: current } = dec(await g("cash"));
  const { mint } = dec(token);

  if (await ext(mint)) fail("Unable to receive from other mints");

  const rcvd = await w.receive(token);

  await s("cash", enc([...current, ...rcvd]));
  return rcvd.reduce((a, b) => a + b.amount, 0);
}

export async function mint(amount, v = 4) {
  const { proofs } = dec(await g("cash"));
  const { send, returnChange } = await w.send(amount, proofs);
  const rcvd = await w.receive(enc(send, v));
  const change = enc(returnChange, v);
  await s("cash", change);
  return enc(rcvd, v);
}

export async function check(token) {
  const o = dec(token);
  const { mint, proofs } = o;
  const total = proofs.reduce((a, b) => a + b.amount, 0);

  const external = await ext(mint);

  const r = await w.checkProofsSpent(proofs);
  const spent = r.reduce((a, b) => a + b.amount, 0);

  return { total, spent, mint, external };
}

export async function init(amount = 10000) {
  try {
    await new Promise((r) => setTimeout(r, 2000));
    const { quote, request } = await w.createMintQuote(amount);
    await lnb.pay(request);

    await wait(async () => {
      const { state } = await w.checkMintQuote(quote);
      return state === MintQuoteState.PAID;
    });

    const { proofs } = await w.mintTokens(amount, quote);

    const cash = getEncodedTokenV4({
      token: [{ mint: config.mintUrl, proofs }],
    });

    await s("cash", cash);
  } catch (e) {
    console.log(e);
  }
}