حسب ضرورت گیمز - پروویبلی فیئر

const LAMB_CHOP_TOTAL_HOPS = 16;

const LAMB_CHOP_LANES = {
  easy: [19, 21],
  medium: [19, 23],
  hard: [19, 25],
  very_hard: [19, 27],
  death_wish: [20, 32],
};

const LAMB_CHOP_PAYTABLE = {
  easy: [
    1.0721, 1.1912, 1.3313, 1.4977, 1.6975, 1.94, 2.2384, 2.6115,
    3.0863, 3.7036, 4.5266, 5.6583, 7.275, 9.7, 13.58, 20.37,
  ],
  medium: [
    1.1742, 1.4351, 1.7728, 2.216, 2.8069, 3.6089, 4.7194, 6.2925,
    8.5807, 12.013, 17.3522, 26.0283, 40.9016, 68.1694, 122.705, 245.41,
  ],
  hard: [
    1.2763, 1.7017, 2.3023, 3.1657, 4.432, 6.3315, 9.2537, 13.8806,
    21.4519, 34.323, 57.2051, 100.1089, 185.9166, 371.8333, 818.0333, 2045.0833,
  ],
  very_hard: [
    1.3784, 1.991, 2.928, 4.392, 6.7344, 10.5826, 17.0951, 28.4918,
    49.2132, 88.5838, 167.325, 334.65, 717.1071, 1673.25, 4350.45, 13051.35,
  ],
  death_wish: [
    1.552, 2.5322, 4.2203, 7.1994, 12.5989, 22.6781, 42.1166, 80.9934,
    161.9869, 338.7, 745.1401, 1738.6604, 4346.651, 11798.0529, 35394.1588, 120340.14,
  ],
};

async function verifyLambChopBet(serverSeed, clientSeed, nonce, volatility) {
  const seed = await deriveGameSeed(serverSeed, clientSeed, nonce);
  const result = await verifyLambChopFromSeed(seed, volatility);
  return { serverSeed, clientSeed, nonce, ...result };
}

async function verifyLambChopFromSeed(seed, volatility) {
  const lane = LAMB_CHOP_LANES[volatility];
  if (!lane) throw new Error(`No lamb-chop lane geometry for risk profile '${volatility}'.`);

  const [safeStart, totalStart] = lane;
  const entropy = new GameEntropy(hexToBytes(seed));
  const hops = [];
  let bustIndex = LAMB_CHOP_TOTAL_HOPS;

  for (let hop = 0; hop < LAMB_CHOP_TOTAL_HOPS; hop++) {
    const safePositions = safeStart - hop;
    const totalPositions = totalStart - hop;
    const roll = await unbiasedUint(entropy, totalPositions);
    const survived = roll < safePositions;

    hops.push({
      hop,
      safePositions,
      totalPositions,
      chance: safePositions / totalPositions,
      roll,
      survived,
    });

    if (!survived) {
      bustIndex = hop;
      break;
    }
  }

  return {
    seed,
    entropyCursor: entropy.cursor,
    volatility,
    hops,
    bustIndex,
    clearedAllHops: bustIndex >= LAMB_CHOP_TOTAL_HOPS,
    maxReachableMultiplier: lambChopMultiplierFor(volatility, bustIndex),
    paytable: LAMB_CHOP_PAYTABLE[volatility],
  };
}

function lambChopMultiplierFor(volatility, hopCount) {
  if (hopCount < 1) return 0;

  const row = LAMB_CHOP_PAYTABLE[volatility];
  if (!row) throw new Error(`No lamb-chop paytable for risk profile '${volatility}'.`);

  const multiplier = row[hopCount - 1];
  if (multiplier === undefined) {
    throw new Error(`No lamb-chop paytable row for ${volatility} at ${hopCount} hop(s).`);
  }

  return multiplier;
}

// Use the revealed server seed (64 hex characters) and the client seed and nonce shown on the bet.
console.log(await verifyLambChopBet(
  'REVEALED_SERVER_SEED',
  'yeetdemo-7f3a91',
  '1842',
  'easy'
));