const G1 = 14.134725141734693;

function gammaFloors(price, threshold=0.08) {
  const floors = [];
  for (let n = 1; n <= 200; n++) {
    const f = G1 * n;
    if (f > price * 2.2) break;
    const dist = (price - f) / price;
    if (Math.abs(dist) < threshold) {
      floors.push({ n, floor: f.toFixed(2), pct: (dist*100).toFixed(2),
                    above: dist > 0, label: `γ₁×${n}` });
    }
  }
  return floors.sort((a,b) => Math.abs(a.dist)-Math.abs(b.dist));
}

// Key γ₁ floors: ×7=$98.94 ×10=$141.35 ×12=$169.62 ×14=$197.89 ×20=$282.69

// Weights: γ₁=0.35, H=H†=0.25, LSOS=0.20, WLD=0.10, FEP=0.10
function canonScore(price, bid, ask, prevClose) {
  const floors = gammaFloors(price);
  const gamma1Score  = floors.length ? Math.max(0, 1-Math.abs(floors[0].dist)*12) : 0.1;
  const spreadPct    = (ask-bid)/price;
  const gateScore    = Math.max(0, 1 - spreadPct * 200);
  const change       = prevClose ? (price-prevClose)/prevClose : 0;
  const lsosScore    = change > 0 && change < 0.05 ? 0.8 : change > 0 ? 0.5 : 0.2;
  const wldScore     = Math.abs(change) < 0.07 ? 0.9 : 0.1;
  const fepScore     = 0.6; // needs regime data
  return gamma1Score*0.35 + gateScore*0.25 + lsosScore*0.20 + wldScore*0.10 + fepScore*0.10;
}

// POST /mefine/tick
{
  symbol:   "NVDA",          // ticker
  price:    115.50,          // last trade
  bid:      115.45,          // bid
  ask:      115.55,          // ask
  volume:   1234567,         // volume
  ts:       1711897200000    // unix ms
}

// GET /mefine/score?symbol=NVDA&price=115.50&bid=115.45&ask=115.55
// GET /mefine/floors?price=115.50
// GET /mefine/watchlist
// GET /mefine/signal