// Sirius.X pricing model — deterministic per-label cost so users can predict
// what a name or TLD will cost before they click Register. Public tiers only;
// operator-level discounts and coupon overrides land in a future revision
// (the plan is oracle-fed rates + coupon-code redemption at mint time).
//
// Two layers decide what a NAME costs:
//   1. The TLD owner's on-chain policy (`price`, `hidden`, `policy`) — read
//      from the gateway's /api/tlds snapshot of the TLD beacon. A TLD owner
//      who sets `price: 7` sells every name under that TLD for $7, flat.
//   2. Otherwise the length tiers below.
//
// Exposed as window.siriusPricing so both the register-flow modal and the
// inline search widgets on landing/tld.html use one source of truth.

(() => {
  // Chipnet placeholder rate: mainnet swaps this for a real BCH/USD oracle.
  // The numbers keep the demo transactions in the "few chipnet coins" range
  // so a single faucet visit covers a name or a TLD.
  const CHIPNET_SATS_PER_USD = 250_000;

  const usdToSats = (usd) => BigInt(Math.max(0, Math.round(Number(usd) * CHIPNET_SATS_PER_USD)));

  const cleanLabel = (s) => String(s || "").toLowerCase().replace(/[^a-z0-9-]/g, "");

  // ---------- TLD owner policies ----------
  // tld -> { price, hidden, frozen, policy, owner, records }
  // Filled from /api/tlds (see loadTldPolicies). Unknown TLDs fall through
  // to tier pricing and are treated as sellable, so a gateway blip never
  // blocks a purchase; the chain is the authority at mint time anyway.
  // include_hidden=1 so the policy map knows about switched-off (private)
  // TLDs too — their owners register names under them from the portal, and
  // the register flow must be able to price and gate them. The public
  // listing (visibleTlds) still drops anything hidden.
  const TLD_API = "https://navigate.st/api/tlds?include_hidden=1";
  const TLD_POLICIES = new Map();
  let tldList = null;      // raw /api/tlds rows, once loaded (hidden ones excluded)
  let tldLoad = null;      // memoised in-flight fetch

  function normalisePolicy(row) {
    const rec = row && row.records && typeof row.records === "object" ? row.records : {};
    const priceRaw = row && row.price_usd != null ? row.price_usd : rec.price;
    const price = typeof priceRaw === "number" && Number.isFinite(priceRaw) && priceRaw >= 0 ? priceRaw : null;
    const hidden = !!(row && row.hidden) || rec.hidden === 1 || rec.hidden === true;
    const policy = typeof rec.policy === "string" ? rec.policy : "open";
    return {
      tld: row.tld,
      price,
      hidden,
      hiddenBy: row && row.hidden_by ? row.hidden_by : (hidden ? "owner" : null),
      frozen: policy === "frozen",
      policy,
      owner: row && row.owner ? row.owner : null,
      records: rec,
    };
  }

  function setTldPolicies(rows) {
    TLD_POLICIES.clear();
    for (const r of rows || []) {
      const row = typeof r === "string" ? { tld: r } : r;
      const tld = cleanLabel(row && row.tld);
      if (!tld) continue;
      TLD_POLICIES.set(tld, normalisePolicy({ ...row, tld }));
    }
  }

  // Fetch the TLD list once per page. Resolves to the array of visible TLD
  // rows (or null on failure) — never rejects, callers just fall back.
  function loadTldPolicies({ url = TLD_API, force = false } = {}) {
    if (tldLoad && !force) return tldLoad;
    tldLoad = (async () => {
      try {
        const r = await fetch(url, { cache: "no-store" });
        if (!r.ok) throw new Error("api " + r.status);
        const j = await r.json();
        const rows = Array.isArray(j.tlds) ? j.tlds : [];
        setTldPolicies(rows);
        // Only a beacon-sourced list is a sellable list. A gateway still
        // serving the legacy `tlds.bch`-derived union includes every suffix
        // that ever appeared on a name (".de", ".silentmode", …), which is
        // not what the registry sells — keep the page's own fallback then.
        tldList = j.source === "TLD_BEACON" ? rows.filter((t) => !t.hidden) : null;
        return tldList;
      } catch {
        return null;
      }
    })();
    return tldLoad;
  }

  // Resolves once the list is loaded, or after `ms` — search UIs await this
  // so the first paint already shows owner prices without ever hanging.
  function tldReady(ms = 2500) {
    return Promise.race([
      loadTldPolicies(),
      new Promise((res) => setTimeout(() => res(null), ms)),
    ]);
  }

  function tldPolicy(tld) {
    return TLD_POLICIES.get(cleanLabel(tld)) || null;
  }

  // Does one of `addresses` (the signed-in wallet's) hold this TLD's NFT?
  // `owner` comes from the gateway's beacon snapshot (mint output, updated
  // on every TUPD carrier), so a wallet that owns the TLD matches here.
  function isTldOwner(tld, addresses) {
    const p = tldPolicy(tld);
    if (!p || !p.owner || !addresses) return false;
    const list = Array.isArray(addresses) ? addresses : [addresses];
    return list.some((a) => typeof a === "string" && a === p.owner);
  }

  // Can names be sold under this TLD right now?
  //   hidden  → owner switched the TLD off: private TLD. The public cannot
  //             buy, but the OWNER still can — pass their wallet addresses
  //             and a hidden TLD they hold answers ok with owner: true.
  //   frozen  → owner set policy "frozen" (no new registrations, owner included)
  function tldSellable(tld, addresses) {
    const p = tldPolicy(tld);
    if (!p) return { ok: true, reason: null, owner: false };
    const owner = isTldOwner(tld, addresses);
    if (p.frozen) return { ok: false, reason: "frozen", policy: p, owner };
    if (p.hidden && !owner) return { ok: false, reason: "hidden", policy: p, owner };
    return { ok: true, reason: null, policy: p, owner };
  }

  // Visible TLD labels in listing order, or null if no beacon-sourced list
  // is available (callers keep their own fallback list then).
  function visibleTlds() {
    return tldList ? tldList.map((t) => t.tld) : null;
  }

  // ---------- name pricing ----------
  // Owner-set flat price first; else LENGTH-first tiers, then downshift for
  // "less brandable" shapes (all-digits, hyphenated). Kept as multiplicative
  // modifiers so tiers remain the primary story and mods just soften an
  // edge case.
  function priceForName(label, tld) {
    const s = cleanLabel(label);
    if (!s) return { usd: 0, tier: "invalid" };
    const p = tld ? tldPolicy(tld) : null;
    if (p && p.price != null) {
      return { usd: p.price, tier: "tld-set", sats: usdToSats(p.price), tld: p.tld, ownerSet: true };
    }
    let usd, tier;
    if (s.length === 1)      { usd = 5.00; tier = "premium-1"; }
    else if (s.length === 2) { usd = 3.00; tier = "short-2"; }
    else if (s.length === 3) { usd = 2.00; tier = "short-3"; }
    else if (s.length <= 5)  { usd = 1.00; tier = "standard"; }
    else if (s.length <= 7)  { usd = 0.50; tier = "long"; }
    else if (s.length <= 16) { usd = 0.25; tier = "extended"; }
    else                     { usd = 0.10; tier = "very-long"; }
    // Modifiers.
    if (/^\d+$/.test(s))     { usd = round2(usd * 0.5); tier += "+digits"; }
    if (s.includes("-"))     { usd = round2(usd * 0.7); tier += "+hyphen"; }
    return { usd, tier, sats: usdToSats(usd) };
  }

  // Per-label overrides — TLDs the operator wants priced outside the tiers.
  // Cheap namespaces (`.test`, `.dev`, `.local`) exist for experimentation,
  // school assignments and demo throwaways: length-tier pricing prices them
  // like premium TLDs, which isn't the point. Add labels here to opt them
  // out of the tier and (optionally) mark them renewal-free.
  //
  // Shape: label -> { usd, tier, noRenewal? }
  const SPECIAL_TLDS = {
    "test": { usd: 0.01, tier: "sandbox", noRenewal: true },
  };

  function priceForTld(label) {
    const s = cleanLabel(label);
    if (!s) return { usd: 0, tier: "invalid" };
    if (Object.prototype.hasOwnProperty.call(SPECIAL_TLDS, s)) {
      const o = SPECIAL_TLDS[s];
      return { usd: o.usd, tier: o.tier, sats: usdToSats(o.usd), noRenewal: !!o.noRenewal };
    }
    let usd, tier;
    if (s.length === 1)       { usd = 500.00; tier = "premium-1"; }
    else if (s.length === 2)  { usd = 250.00; tier = "short-2"; }
    else if (s.length === 3)  { usd = 150.00; tier = "short-3"; }
    else if (s.length <= 6)   { usd = 100.00; tier = "standard"; }
    else if (s.length <= 10)  { usd = 50.00;  tier = "long"; }
    else                      { usd = 25.00;  tier = "extended"; }
    return { usd, tier, sats: usdToSats(usd) };
  }

  // Rounded USD → display string. Under $1 shows cents ($0.25); $1 and up
  // shows whole dollars ($5) unless there's a fractional part.
  function formatUsd(usd) {
    const n = Number(usd || 0);
    if (n >= 1 && n === Math.floor(n)) return `$${n}`;
    return `$${n.toFixed(2)}`;
  }
  function formatSats(sats) {
    return `${BigInt(sats || 0n).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")} sat`;
  }
  function round2(n) { return Math.round(Number(n) * 100) / 100; }

  window.siriusPricing = {
    priceForName,
    priceForTld,
    formatUsd,
    formatSats,
    usdToSats,
    CHIPNET_SATS_PER_USD,
    // TLD owner policy layer
    loadTldPolicies,
    setTldPolicies,
    tldReady,
    tldPolicy,
    tldSellable,
    isTldOwner,
    visibleTlds,
    TLD_API,
  };

  // Warm the policy cache as soon as the script lands; every consumer
  // awaits tldReady() before it paints a price.
  loadTldPolicies();
})();