"use strict";
// Solana Name Service resolver — .sol names via Bonfida's public SDK proxy.
// SNS stores URL and IPFS records on-chain; the proxy exposes them as a
// REST endpoint so Theseus doesn't need the Solana web3.js stack bundled in.
//
// Proxy responses (as of 2026-10):
//   GET /resolve/<name>        → { s: "ok", result: "<address or url>" }
//                               or { s: "error", result: "..." }
//   GET /record/<name>/url     → { s: "ok", result: "https://…" }
//   GET /record/<name>/ipfs    → { s: "ok", result: "<cid>" }
//   GET /record/<name>/arwv    → { s: "ok", result: "<arweave-tx>" }
//
// We prefer URL (clearnet redirect) over IPFS (gateway) over Arweave
// (gateway) because URL is explicit intent and the user's gateway choice
// shouldn't matter for a plain redirect.
//
// If the user's IP is Cloudflare-blocked for the default proxy, they can
// paste any Solana RPC + sns-sdk-proxy compatible endpoint into Advanced.

const POS_TTL_MS = 10 * 60 * 1000;
const NEG_TTL_MS = 60 * 1000;
const RPC_TIMEOUT_MS = 5000;
const CACHE = new Map();

async function proxyGet(base, path) {
  const url = base.replace(/\/+$/, "") + path;
  const ctrl = new AbortController();
  const t = setTimeout(() => ctrl.abort(new Error("SNS proxy timeout")), RPC_TIMEOUT_MS);
  try {
    const res = await fetch(url, {
      method: "GET",
      headers: { "accept": "application/json", "user-agent": "Theseus/0.3.99 (silentmode.st)" },
      signal: ctrl.signal,
    });
    if (!res.ok) throw new Error(`SNS HTTP ${res.status}`);
    const json = await res.json();
    if (json?.s === "ok" && json.result) return String(json.result);
    return null; // no record / name not registered
  } finally { clearTimeout(t); }
}

async function resolve(host, { rpc, gateway } = {}) {
  if (!host) return null;
  const name = String(host).toLowerCase();
  if (!name.endsWith(".sol") || name === ".sol" || name === "sol") return null;
  const cached = CACHE.get(name);
  if (cached && cached.exp > Date.now()) return cached.result;

  // "rpc" here is the SNS proxy base URL (not a Solana JSON-RPC); naming
  // is for consistency with the other adapters.
  const base = rpc || "https://sns-sdk-proxy.bonfida.workers.dev";
  const gw   = (gateway || "https://ipfs.io").replace(/\/+$/, "");
  const bareName = name.replace(/\.sol$/i, "");

  try {
    // URL takes precedence (explicit redirect intent).
    const urlRec = await proxyGet(base, `/record/${encodeURIComponent(bareName)}.sol/url`).catch(() => null);
    if (urlRec) {
      const u = /^https?:\/\//i.test(urlRec) ? urlRec : `https://${urlRec}`;
      const result = { url: u, protocol: "sns", kind: "url" };
      CACHE.set(name, { result, exp: Date.now() + POS_TTL_MS });
      return result;
    }
    // IPFS fallback.
    const ipfsRec = await proxyGet(base, `/record/${encodeURIComponent(bareName)}.sol/ipfs`).catch(() => null);
    if (ipfsRec) {
      const result = { url: `${gw}/ipfs/${ipfsRec}`, protocol: "sns", kind: "ipfs", cid: ipfsRec };
      CACHE.set(name, { result, exp: Date.now() + POS_TTL_MS });
      return result;
    }
    const result = { error: "no URL or IPFS record on this .sol name" };
    CACHE.set(name, { result, exp: Date.now() + NEG_TTL_MS });
    return result;
  } catch (err) {
    const result = { error: String(err?.message || err) };
    CACHE.set(name, { result, exp: Date.now() + NEG_TTL_MS });
    return result;
  }
}

function clearCache() { CACHE.clear(); }

module.exports = { resolve, clearCache };