const CryptoJS = require("crypto-js");

function seedGenerator(hash, salt) {
  const hmac = CryptoJS.HmacSHA256(CryptoJS.enc.Hex.parse(hash), salt);
  return hmac.toString(CryptoJS.enc.Hex);
}

function createNums(allNums, hash) {
  const nums = [];
  let h = CryptoJS.SHA256(hash).toString(CryptoJS.enc.Hex);
  allNums.forEach((c) => {
    nums.push({ num: c, hash: h });
    h = h.substring(1) + h.charAt(0);
  });
  nums.sort(function (o1, o2) {
    if (o1.hash < o2.hash) {
      return -1;
    } else if (o1.hash === o2.hash) {
      return 0;
    } else {
      return 1;
    }
  });
  return nums;
}

function getTotalPoint(points) {
  let count = 0;
  points.forEach((point) => {
    let _point = point & 0xf;
    count += _point >= 10 ? 0 : _point;
  });
  return count % 10;
}

function playing(allCards, startIndex) {
  const playerCards = [allCards[startIndex], allCards[startIndex + 2]];
  const bankerCards = [allCards[startIndex + 1], allCards[startIndex + 3]];

  const playerTotalPoint = getTotalPoint(playerCards);
  const bankerTotalPoint = getTotalPoint(bankerCards);

  const lastCard = allCards[startIndex + 5];

  const getLastPoint = function (cards) {
    return getTotalPoint([cards[2]]);
  };

  if (bankerTotalPoint >= 8 || playerTotalPoint >= 8) {
    // get result
  } else if (playerTotalPoint >= 6 && bankerTotalPoint >= 6) {
    // get result
  } else {
    if (playerTotalPoint <= 5) {
      playerCards.push(allCards[startIndex + 4]);
    }

    if (playerCards.length == 2) {
      if (bankerTotalPoint <= 5) {
        bankerCards.push(allCards[startIndex + 4]);
      }
    } else if (bankerTotalPoint <= 2) {
      bankerCards.push(lastCard);
    } else if (
      bankerTotalPoint == 3 &&
      playerCards.length == 3 &&
      getLastPoint(playerCards) != 8
    ) {
      bankerCards.push(lastCard);
    } else if (
      bankerTotalPoint == 4 &&
      playerCards.length == 3 &&
      getLastPoint(playerCards) >= 2 &&
      getLastPoint(playerCards) <= 7
    ) {
      bankerCards.push(lastCard);
    } else if (
      bankerTotalPoint == 5 &&
      playerCards.length == 3 &&
      getLastPoint(playerCards) >= 4 &&
      getLastPoint(playerCards) <= 7
    ) {
      bankerCards.push(lastCard);
    } else if (
      bankerTotalPoint == 6 &&
      playerCards.length == 3 &&
      getLastPoint(playerCards) >= 6 &&
      getLastPoint(playerCards) <= 7
    ) {
      bankerCards.push(lastCard);
    }
  }
  let result = {
    player: {
      points: playerCards.map((card) => createCardFram(card)),
      totalPoint: getTotalPoint(playerCards),
    },
    banker: {
      points: bankerCards.map((card) => createCardFram(card)),
      totalPoint: getTotalPoint(bankerCards),
    },
  };
  return result;
}
function getAllCards(hash, salt) {
  const allNums = [
    161,
    180,
    199,
    218,
    162,
    205,
    181,
    200,
    219,
    163,
    182,
    220,
    201,
    177,
    196,
    215,
    170,
    178,
    221,
    197,
    216,
    171,
    179,
    198,
    172,
    217,
    193,
    212,
    167,
    186,
    194,
    173,
    213,
    168,
    187,
    195,
    214,
    188,
    169,
    209,
    164,
    183,
    202,
    210,
    189,
    165,
    184,
    203,
    211,
    166,
    204,
    185,
  ];
  let seed = seedGenerator(hash, salt);
  let finalNums = createNums(allNums, seed);
  seed = String(CryptoJS.SHA256(seed));
  finalNums = createNums(finalNums, seed);
  let allCards = finalNums
    .slice(0, 6)
    .map((m) => m.num)
    .map((item) => item.num);
  return allCards;
}

function createCardFram(card) {
  const CARDS = " ,A,2,3,4,5,6,7,8,9,10,J,Q,K".split(",");
  const SUITS = ["♠️", "♥️", "♣️", "♦️"];
  let suitsIndex = (card & 240) / 16 - 10;
  let suits = SUITS[suitsIndex];
  let point = CARDS[card % 16];
  let color = suitsIndex % 2 === 0 ? "black" : "red";
  return {
    color,
    suits,
    point,
  };
}

function verifyBaccarat(seed, salt) {
  let allCards = getAllCards(seed, salt);
  let result = playing(allCards, 0);
  console.log(Seed: ${seed} Salt: ${salt});
  console.log(Banker points: ${result.banker.totalPoint} cards: ${result.banker.points.map(m => { return m.color + m.suits + m.point; })});
  console.log(Player points: ${result.player.totalPoint} cards: ${result.player.points.map(m => { return m.color + m.suits + m.point; })});
  console.log("")
  return result;
}

// entry
verifyBaccarat("GAME_HASH", "SALT"); 

const CryptoJS = require("crypto-js");

function seedGenerator(hash, salt) {
    const hmac = CryptoJS.HmacSHA256(CryptoJS.enc.Hex.parse(hash), salt);
    return hmac.toString(CryptoJS.enc.Hex);
}
function createNums(allNums, hash) {
    const nums = [];
    let h = CryptoJS.SHA256(hash).toString(CryptoJS.enc.Hex);
    allNums.forEach((c) => {
        nums.push({ num: c, hash: h });
        h = h.substring(1) + h.charAt(0);
    });
    nums.sort(function (o1, o2) {
        if (o1.hash < o2.hash) {
            return -1;
        } else if (o1.hash === o2.hash) {
            return 0;
        } else {
            return 1;
        }
    });
    return nums;
}
function keno(hash) {
    const salt = 'salt waiting to be generated';
    const allNums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40]
    const seed = seedGenerator(hash, salt);
    let finalNums = createNums(allNums, seed);
    finalNums = createNums(finalNums, seed);
    return finalNums.slice(0, 10).map(m => m.num)
}

let hash = 'game hash';
console.log('result =>', keno( hash ).map(item => item.num).join(','));

  const gameResult = (seed) => {
    const nBits = 52; // number of most significant bits to use
    // 1. r = 52 most significant bits
    seed = seed.slice(0, nBits / 4);
    const r = parseInt(seed, 16);
    // 2. X = r / 2^52
    let X = r / Math.pow(2, nBits); // uniformly distributed in [0; 1)
    X = parseFloat(X.toPrecision(9));
    // 3. X = 99 / (1-X)
    X = 99 / (1 - X);
    // 4. return max(trunc(X), 100)
    const result = Math.floor(X);
    return Math.max(1, result / 100);
  };

  const gameResult = (seed, salt) => {
    const nBits = 52; // number of most significant bits to use

    // 1. HMAC_SHA256(message=seed, key=salt)  
    const hmac = CryptoJS.HmacSHA256(CryptoJS.enc.Hex.parse(seed), salt);
    seed = hmac.toString(CryptoJS.enc.Hex);

    // 2. r = 52 most significant bits
    seed = seed.slice(0, nBits / 4);
    const r = parseInt(seed, 16);

    // 3. X = r / 2^52
    let X = r / Math.pow(2, nBits); // uniformly distributed in [0; 1)
    X = parseFloat(X.toPrecision(9));

    // 4. X = 99 / (1-X)
    X = 99 / (1 - X);

    // 5. return max(trunc(X), 100)
    const result = Math.floor(X);
    return Math.max(1, result / 100);
  };