const ranges = [
    { minRange: 1, maxRange: 25, tag: "T , Foil" },
    { minRange: 1, maxRange: 101, tag: "C , Foil" },
    { minRange: 1, maxRange: 101, tag: "C , Foil" },
    { minRange: 1, maxRange: 101, tag: "C , Foil" },
    { minRange: 1, maxRange: 101, tag: "C , Foil" },
    { minRange: 1, maxRange: 80, tag: "U , Foil" },
    { minRange: 1, maxRange: 80, tag: "U , Foil" },
    { minRange: 1, maxRange: 10, tag: "L , Foil" },
    { minRange: 1, maxRange: 100, tag: "Slot10" },
    { minRange: 1, maxRange: 60, tag: "R , Foil" },
    { minRange: 1, maxRange: 20, tag: "M , Foil" },
    { minRange: 1, maxRange: 34, tag: "Extended Art , Normal" },
    { minRange: 1, maxRange: 100, tag: "Slot11" },
    { minRange: 1, maxRange: 21, tag: "R ONC Extended Art , Normal" },
    { minRange: 1, maxRange: 6, tag: "M ONC Extended Art , Normal" },
    { minRange: 1, maxRange: 5, tag: "Jumpstar Ea , Normal" },
    { minRange: 1, maxRange: 100, tag: "Slot12" },
    { minRange: 1, maxRange: 6, tag: "C Ichor , Normal" },
    { minRange: 1, maxRange: 7, tag: "U Ichor , Normal" },
    { minRange: 1, maxRange: 100, tag: "Slot13" },
    { minRange: 1, maxRange: 6, tag: "C Ichor , Foil" },
    { minRange: 1, maxRange: 7, tag: "U Ichor , Foil" },
    { minRange: 1, maxRange: 100, tag: "Slot14" },
    { minRange: 1, maxRange: 5, tag: "C Step , Foil" },
    { minRange: 1, maxRange: 8, tag: "U Step , Foil" },
    { minRange: 1, maxRange: 25, tag: "R Step , Foil" },
    { minRange: 1, maxRange: 26, tag: "M Step , Foil" },
    { minRange: 1, maxRange: 100, tag: "Slot15" },
    { minRange: 1, maxRange: 7, tag: "Borderless , Normal" },
    { minRange: 1, maxRange: 16, tag: "R Ichor , Normal" },
    { minRange: 1, maxRange: 5, tag: "Manga , Normal" },
    { minRange: 1, maxRange: 11, tag: "M Ichor , Normal" },
    { minRange: 1, maxRange: 6, tag: "Phyrexian , Normal" },
    { minRange: 1, maxRange: 10, tag: "What , Normal" },
    { minRange: 1, maxRange: 100, tag: "Slot16" },
    { minRange: 1, maxRange: 21, tag: "R ONC Extended Art , Foil" },
    { minRange: 1, maxRange: 6, tag: "M ONC Extended Art , Foil" },
    { minRange: 1, maxRange: 33, tag: "Extended Art , Foil" },
    { minRange: 1, maxRange: 7, tag: "Borderless , Foil" },
    { minRange: 1, maxRange: 10, tag: "What , Foil" },
    { minRange: 1, maxRange: 8, tag: "Manga , Foil" },
    { minRange: 1, maxRange: 5, tag: "Phyrexian , Foil" },
    { minRange: 1, maxRange: 11, tag: "M Ichor , Foil" },
    { minRange: 1, maxRange: 16, tag: "R Ichor , Foil" },
];

function incrementNonce(nonce, offset) {
  let seconds = parseInt(nonce.slice(0, 2), 10);
  let minutes = parseInt(nonce.slice(2, 4), 10);
  let hours = parseInt(nonce.slice(4, 6), 10);
  let day = parseInt(nonce.slice(6, 8), 10);
  let month = parseInt(nonce.slice(8, 10), 10);
  let year = parseInt(nonce.slice(10, 14), 10);

  seconds += offset;
  while (seconds > 59) {
    seconds -= 60;
    minutes += 1;
    if (minutes > 59) {
      minutes = 0;
      hours += 1;
      if (hours > 23) {
        hours = 0;
        day += 1;
        const daysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
        if (day > daysInMonth[month - 1]) {
          day = 1;
          month += 1;
          if (month > 12) {
            month = 1;
            year += 1;
          }
        }
      }
    }
  }

  return (
    seconds.toString().padStart(2, '0') +
    minutes.toString().padStart(2, '0') +
    hours.toString().padStart(2, '0') +
    day.toString().padStart(2, '0') +
    month.toString().padStart(2, '0') +
    year.toString().padStart(4, '0')
  );
}

async function generateHmacSha512(key, message) {
  const keyBuffer = new TextEncoder().encode(key);
  const msgBuffer = new TextEncoder().encode(message);
  const cryptoKey = await crypto.subtle.importKey(
    "raw",
    keyBuffer,
    { name: "HMAC", hash: "SHA-512" },
    false,
    ["sign"]
  );
  const signature = await crypto.subtle.sign("HMAC", cryptoKey, msgBuffer);
  return new Uint8Array(signature);
}

async function generateRandomNumbers(ranges, serverSeed, clientSeed, nonce) {
  const randomNumbers = [];
  const numbersPerDigest = 16;
  const digestsNeeded = Math.ceil(ranges.length / numbersPerDigest);

  for (let digestIndex = 0; digestIndex < digestsNeeded; digestIndex++) {
    const message = `${clientSeed}:${nonce}:${digestIndex}`;
    const digest = await generateHmacSha512(serverSeed, message);
    let offset = 0;

    for (let i = 0; i < numbersPerDigest && randomNumbers.length < ranges.length; i++) {
      const range = ranges[randomNumbers.length];
      const bytes = digest.slice(offset, offset + 4);
      const view = new DataView(bytes.buffer, bytes.byteOffset, 4);
      const num = view.getUint32(0, false); // Big-endian
      const rand = Math.floor((num / 0x100000000) * (range.maxRange - range.minRange + 1)) + range.minRange;
      randomNumbers.push(rand);
      offset += 4;
    }
  }

  return randomNumbers;
}

async function mapTaggedResults(randomNumbers, ranges, serverSeed, clientSeed, nonce) {
  const seenValues = {};
  const taggedResults = [];

  for (let index = 0; index < randomNumbers.length; index++) {
    if (!ranges[index]) {
      console.error(`No range found for index ${index}`);
      continue;
    }

    const { tag = "UNKNOWN", minRange, maxRange } = ranges[index];
    let finalNumber = randomNumbers[index];
    let nonceOffset = 0;

    if (!seenValues[tag]) {
      seenValues[tag] = new Set();
    }

    while (seenValues[tag].has(finalNumber.toString())) {
      nonceOffset++;
      const newNonce = incrementNonce(nonce, nonceOffset);
      const message = `${clientSeed}:${newNonce}`;
      const digest = await generateHmacSha512(serverSeed, message);
      const bytes = digest.slice(0, 4);
      const view = new DataView(bytes.buffer, bytes.byteOffset, 4);
      const newNum = view.getUint32(0, false); // Big-endian
      finalNumber = Math.floor((newNum / 0x100000000) * (maxRange - minRange + 1)) + minRange;
    }

    seenValues[tag].add(finalNumber.toString());
    taggedResults.push({ value: finalNumber.toString(), tag });
  }

  return taggedResults;
}

async function filterResults(taggedResults, ranges, serverSeed, clientSeed, nonce) {
  let filteredResults = [];
  let nonceOffset = 0;
  const usedIndexes = new Set();

  const findAndConsume = (tag) => {
    const item = taggedResults.find((item, i) => item.tag === tag && !usedIndexes.has(i));
    if (item) usedIndexes.add(taggedResults.indexOf(item));
    return item;
  };

  const add = (item) => { if (item) filteredResults.push(item); };

  let tFrameFoil = taggedResults.filter((item, i) => item.tag === "T , Foil" && !usedIndexes.has(i));
  tFrameFoil.slice(0, 1).forEach(item => {
    usedIndexes.add(taggedResults.indexOf(item));
    filteredResults.push(item);
  });

  let cFoil = taggedResults.filter((item, i) => item.tag === "C , Foil" && !usedIndexes.has(i));
  cFoil.slice(0, 4).forEach(item => {
    usedIndexes.add(taggedResults.indexOf(item));
    filteredResults.push(item);
  });

  let uFoil = taggedResults.filter((item, i) => item.tag === "U , Foil" && !usedIndexes.has(i));
  uFoil.slice(0, 2).forEach(item => {
    usedIndexes.add(taggedResults.indexOf(item));
    filteredResults.push(item);
  });

  let lFoil = taggedResults.filter((item, i) => item.tag === "L , Foil" && !usedIndexes.has(i));
  lFoil.slice(0, 1).forEach(item => {
    usedIndexes.add(taggedResults.indexOf(item));
    filteredResults.push(item);
  });

  const slot10 = taggedResults.find(item => item.tag === "Slot10");
  if (slot10) {
    const num = parseInt(slot10.value, 10);
    if (num <= 86) add(findAndConsume("R , Foil"));
    else if (num <= 100) add(findAndConsume("M , Foil"));
  }

  let eaNorm = taggedResults.filter((item, i) => item.tag === "Extended Art , Normal" && !usedIndexes.has(i));
  eaNorm.slice(0, 1).forEach(item => {
    usedIndexes.add(taggedResults.indexOf(item));
    filteredResults.push(item);
  });

  const slot11 = taggedResults.find(item => item.tag === "Slot11");
  if (slot11) {
    const num = parseInt(slot11.value, 10);
    if (num <= 74) add(findAndConsume("R ONC Extended Art , Normal"));
    else if (num <= 100) add(findAndConsume("M ONC Extended Art , Normal"));
  }

  const slot12 = taggedResults.find(item => item.tag === "Slot12");
  if (slot12) {
    const num = parseInt(slot12.value, 10);
    if (num <= 63) add(findAndConsume("C Ichor , Normal"));
    else if (num <= 100) add(findAndConsume("U Ichor , Normal"));
  }

  const slot13 = taggedResults.find(item => item.tag === "Slot13");
  if (slot13) {
    const num = parseInt(slot13.value, 10);
    if (num <= 63) add(findAndConsume("C Ichor , Foil"));
    else if (num <= 100) add(findAndConsume("U Ichor , Foil"));
  }

  const slot14 = taggedResults.find(item => item.tag === "Slot14");
  if (slot14) {
    const num = parseInt(slot14.value, 10);
    if (num <= 38) add(findAndConsume("C Step , Foil"));
    else if (num <= 67) add(findAndConsume("U Step , Foil"));
    else if (num <= 89) add(findAndConsume("R Step , Foil"));
    else if (num <= 100) add(findAndConsume("M Step , Foil"));
  }

  const slot15 = taggedResults.find(item => item.tag === "Slot15");
  if (slot15) {
    const num = parseInt(slot15.value, 10);
    if (num <= 13) add(findAndConsume("Borderless , Normal"));
    else if (num <= 54) add(findAndConsume("R Ichor , Normal"));
    else if (num <= 81) add(findAndConsume("Manga , Normal"));
    else if (num <= 94) add(findAndConsume("M Ichor , Normal"));
    else if (num <= 97) add(findAndConsume("Phyrexian , Normal"));
    else if (num <= 100) add(findAndConsume("What , Normal"));
  }

  const slot16 = taggedResults.find(item => item.tag === "Slot16");
  if (slot16) {
    const num = parseInt(slot16.value, 10);
    if (num <= 23) add(findAndConsume("R ONC Extended Art , Foil"));
    else if (num <= 25) add(findAndConsume("M ONC Extended Art , Foil"));
    else if (num <= 50) add(findAndConsume("Extended Art , Foil"));
    else if (num <= 57) add(findAndConsume("Borderless , Foil"));
    else if (num <= 58) add(findAndConsume("What , Foil"));
    else if (num <= 72) add(findAndConsume("Manga , Foil"));
    else if (num <= 73) add(findAndConsume("Phyrexian , Foil"));
    else if (num <= 80) add(findAndConsume("M Ichor , Foil"));
    else if (num <= 100) add(findAndConsume("R Ichor , Foil"));
  }

  return filteredResults;
}

async function setData(serverSeed, clientSeed, nonce) {
  const randomNumbers = await generateRandomNumbers(ranges, serverSeed, clientSeed, nonce);
  const taggedResults = await mapTaggedResults(randomNumbers, ranges, serverSeed, clientSeed, nonce);
  const filteredResults = await filterResults(taggedResults, ranges, serverSeed, clientSeed, nonce);

  return {
    success: true,
    result: filteredResults,
    nonce,
    serverSeed,
    clientSeed
  };
}
export { setData, ranges};
