// Marketplace page: list the gateway's active offers and complete a purchase.
//
// A listing is the seller's partially signed transaction (see
// Argus/src/lib/market-tx.js). Buying = verify it locally, append our own
// funding inputs and the outputs that give us the certificate and update
// the registry, sign our inputs, broadcast. The seller's signature only
// stays valid while their certificate UTXO is unspent, so the gateway prunes
// stale offers and the buyer's broadcast is the final arbiter.

import * as BNS from "https://silentmode.st/js/bns-register.js?v=20260917market";

const API = "https://silentmode.st";
const $ = (id) => document.getElementById(id);
const esc = (s) => String(s ?? "").replace(/[&<>"']/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c]));
const fmtInt = (n) => String(n).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
const usd = (sats) => { const r = window.siriusPricing?.CHIPNET_SATS_PER_USD || 250000; const v = Number(sats) / r; return (window.siriusPricing?.formatUsd || ((n) => "$" + n.toFixed(2)))(Math.round(v * 100) / 100); };
const shortAddr = (a) => (a ? a.replace(/^[^:]+:/, "").slice(0, 8) + "…" + a.slice(-5) : "—");

let listings = [];
let wallet = null;
let selected = null;

async function restoreWallet() {
  if (window.siriusWallet) return window.siriusWallet;
  const S = window.siriusSession;
  if (!S?.restore) return null;
  try {
    const s = await S.restore();
    if (!s?.mnemonic) return null;
    const w = await BNS.BuiltInWallet.fromMnemonic(s.mnemonic, BNS.CHIPNET_PREFIX, s.accountPath || undefined);
    window.siriusWallet = w;
    return w;
  } catch { return null; }
}

async function load() {
  const status = $("status");
  try {
    const r = await fetch(`${API}/api/market`, { cache: "no-store" });
    if (!r.ok) throw new Error("API " + r.status);
    const j = await r.json();
    listings = (j.listings || []).map((l) => ({ ...l, label: l.name.split(".")[0], tld: l.tld || l.name.split(".").pop() }));
    render();
  } catch (e) { status.className = "status err"; status.textContent = "Could not load listings: " + (e.message || e); }
}
function render() {
  const q = ($("q").value || "").toLowerCase().trim();
  const sort = $("sort").value;
  const tldSel = $("tld");
  const tlds = [...new Set(listings.map((l) => l.tld))].sort();
  const keep = tldSel.value;
  tldSel.innerHTML = `<option value="">All TLDs</option>` + tlds.map((t) => `<option value="${esc(t)}"${t === keep ? " selected" : ""}>.${esc(t)}</option>`).join("");
  let rows = listings.filter((l) => (!q || l.name.includes(q)) && (!tldSel.value || l.tld === tldSel.value));
  rows.sort((a, b) => sort === "name" ? a.name.localeCompare(b.name) : sort === "new" ? Date.parse(b.created_at) - Date.parse(a.created_at) : Number(a.price_sats) - Number(b.price_sats));
  $("count").textContent = `${rows.length} of ${listings.length}`;
  const status = $("status");
  if (!listings.length) { status.className = "status"; status.textContent = "Nothing is for sale right now. Owners list names from their dashboard."; $("list").innerHTML = ""; return; }
  status.className = "status"; status.textContent = `${listings.length} name${listings.length === 1 ? "" : "s"} for sale. Prices are set by the sellers; you pay the price plus about 1,300 sat of chain dust and fee.`;
  $("list").innerHTML = rows.length ? rows.map((l) => `
    <div class="row">
      <div class="n">${esc(l.label)}.<span class="tld">${esc(l.tld)}</span> ${wallet && l.seller === wallet.address ? '<span class="badge">yours</span>' : ""}</div>
      <div class="price"><b>${fmtInt(l.price_sats)} sat</b><span>≈ ${esc(usd(l.price_sats))}</span></div>
      <div><button class="btn acid small" data-buy="${esc(l.name)}" ${wallet && l.seller === wallet.address ? "disabled" : ""}>Buy →</button></div>
      <div class="meta"><span>seller ${esc(shortAddr(l.seller))}</span><span>·</span><span>listed ${esc(new Date(l.created_at).toLocaleDateString())}</span><span>·</span><a href="${API}/bns/${encodeURIComponent(l.name)}/" target="_blank" rel="noopener">view site →</a></div>
    </div>`).join("") : `<div class="empty">Nothing matches that filter.</div>`;
}
["q", "sort", "tld"].forEach((id) => $(id).addEventListener("input", render));
document.addEventListener("click", (e) => { const b = e.target.closest("[data-buy]"); if (b) openBuy(b.dataset.buy); });

// ---------- buy ----------
function setMsg(t, cls = "") { $("buy-msg").textContent = t; $("buy-msg").className = "msg " + cls; }
function push(t) { const log = $("buy-steps"); log.className = "steps on"; const d = document.createElement("div"); d.textContent = t; log.appendChild(d); log.scrollTop = 1e6; }
function openBuy(name) {
  selected = listings.find((l) => l.name === name); if (!selected) return;
  $("buy-name").textContent = name;
  const price = BigInt(selected.price_sats);
  const check = BNS.verifyListing(selected, { category: selected.category });
  $("buy-kv").innerHTML = [
    ["Price", `${fmtInt(price)} sat (≈ ${esc(usd(price))})`],
    ["Seller", esc(selected.seller)],
    ["You receive", "the name's certificate, to your token address"],
    ["Offer check", check.ok ? "seller signature valid" : "INVALID: " + esc(check.error)],
    ["Extra", "≈ 1,600 sat dust + fee"],
  ].map(([k, v]) => `<div class="k">${k}</div><div class="v">${v}</div>`).join("");
  $("buy-steps").className = "steps"; $("buy-steps").innerHTML = ""; setMsg("");
  const canBuy = !!wallet && check.ok && wallet.address !== selected.seller;
  $("buy-go").disabled = !canBuy; $("buy-go").textContent = "Buy — sign & broadcast";
  $("buy-signin").hidden = !!wallet;
  if (!wallet) setMsg("Sign in on the dashboard first — the purchase is signed with your wallet in this browser.");
  $("buy").classList.add("open");
}
const closeBuy = () => $("buy").classList.remove("open");
$("buy-close").addEventListener("click", closeBuy); $("buy-cancel").addEventListener("click", closeBuy);
$("buy").addEventListener("click", (e) => { if (e.target === $("buy")) closeBuy(); });
$("buy-go").addEventListener("click", async () => {
  if (!selected || !wallet) return;
  const btn = $("buy-go"); btn.disabled = true; btn.textContent = "Buying…"; setMsg("");
  let el = null;
  try {
    el = await BNS.connect(); push("connected to chipnet");
    const utxos = await BNS.getUtxosForAddresses(el, wallet.watchedAddresses);
    push(`wallet has ${utxos.filter((u) => !u.token).length} spendable coin(s)`);
    const built = BNS.completeSale({ listing: selected, buyerAddress: wallet.address, buyerTokenAddress: wallet.tokenAddress, utxos, records: selected.records || {}, addressToLockingBytecode: BNS.addressToLockingBytecode });
    push(`built sale · price ${fmtInt(built.costs.priceSats)} sat · fee ${built.costs.chainFeeSats} sat`);
    const signed = BNS.signInputs(built.transaction, built.sourceOutputs, (h) => wallet.keyFor(h), { skip: [built.sellerInputIndex] });
    push("signed your inputs (the seller's signature is already in place)");
    const txid = await BNS.broadcast(el, signed.hex);
    push("broadcast: " + txid);
    setMsg(`Done. ${selected.name} is yours — it appears in your dashboard within a minute.`, "ok");
    btn.textContent = "Bought ✓";
    setTimeout(load, 3000);
  } catch (e) {
    const raw = String(e.message || e);
    setMsg(/not enough funds/i.test(raw) ? `Not enough coins: ${raw}. Fund ${wallet.address} first.` : "Failed: " + raw, "err");
    push("error: " + raw); btn.disabled = false; btn.textContent = "Buy — sign & broadcast";
  } finally { try { el?.close?.(); } catch {} }
});

(async function boot() {
  wallet = await restoreWallet();
  await load();
})();