@perk.money/perk-swap-core/dist/perk-swap-core.cjs.development.js

This npm package contains core logic of Perk Aggregator build on top of NEAR blockchain

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var tokenList = require('@tonic-foundation/token-list');
var JSBI = require('jsbi');
var BN$1 = require('bn.js');
var nearApiJs = require('near-api-js');
var Decimal = require('decimal.js');
var jsonRpcProvider = require('near-api-js/lib/providers/json-rpc-provider');
var nearUnits = require('near-units');
var transaction = require('near-api-js/lib/transaction');
var rpc_errors = require('near-api-js/lib/utils/rpc_errors');
var utils = require('near-api-js/lib/utils');
var key_stores = require('near-api-js/lib/key_stores');
var provider = require('near-api-js/lib/providers/provider');
var constants = require('near-api-js/lib/constants');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var JSBI__default = /*#__PURE__*/_interopDefaultLegacy(JSBI);
var BN__default = /*#__PURE__*/_interopDefaultLegacy(BN$1);
var Decimal__default = /*#__PURE__*/_interopDefaultLegacy(Decimal);

const ZERO = /*#__PURE__*/JSBI__default["default"].BigInt(0);

const STORAGE_TO_REGISTER_WITH_MFT = '100000000000000000000000';
const REF_FINANCE_ID = 'v2.ref-finance.near';
const JUMBO_ID = 'v1.jumbo_exchange.near';
const TONIC_ID = 'v1.orderbook.near';
const WRAPPED_NEAR_ID = 'wrap.near';
const MEMO = 'perk'; // TODO: change
const DEFAULT_GAS = '150000000000000';

exports.SwapMode = void 0;

(function (SwapMode) {
  SwapMode["ExactIn"] = "ExactIn";
  SwapMode["ExactOut"] = "ExactOut";
})(exports.SwapMode || (exports.SwapMode = {}));

const decimalsExponentiateBase = /*#__PURE__*/JSBI__default["default"].BigInt(10);
const addDecimals = (number, decimals) => {
  const decimalsJSBI = decimals instanceof JSBI__default["default"] ? decimals : JSBI__default["default"].BigInt(decimals);
  const multiplier = JSBI__default["default"].exponentiate(decimalsExponentiateBase, decimalsJSBI);
  return JSBI__default["default"].multiply(number, multiplier);
};
const removeDecimals = (number, decimals) => {
  const decimalsJSBI = decimals instanceof JSBI__default["default"] ? decimals : JSBI__default["default"].BigInt(decimals);
  const multiplier = JSBI__default["default"].exponentiate(decimalsExponentiateBase, decimalsJSBI);
  return JSBI__default["default"].divide(number, multiplier);
};
const changeDecimals = (number, fromDecimals, toDecimals) => {
  const numbweWithNewDecimals = removeDecimals(addDecimals(number, toDecimals), fromDecimals);
  return numbweWithNewDecimals;
};

const filterEmptyPools = pools => pools.filter(pool => pool.shares_total_supply !== '0');

const createCorrelation = (arr1, arr2) => arr1.reduce((acc, curr, index) => acc.set(curr, arr2[index]), new Map());

const createReserves = pool => createCorrelation(pool.token_account_ids, pool.amounts.map(a => JSBI__default["default"].BigInt(a)));

const createCAmountReserves = pool => createCorrelation(pool.token_account_ids, pool.c_amounts.map(a => JSBI__default["default"].BigInt(a)));

const getMostLiquidPools = pools => {
  const poolsMap = pools.reduce((acc, pool) => {
    const tokenAccountsIds = pool.token_account_ids.sort();
    const id = `${tokenAccountsIds[0]}_${tokenAccountsIds[1]}`;

    if (acc.has(id)) {
      const savedPools = acc.get(id) || [];
      acc.set(id, [...savedPools, pool]);
    } else {
      acc.set(id, [pool]);
    }

    return acc;
  }, new Map());
  const uniqPoolsByAmounts = Array.from(poolsMap.values()).flatMap(poolsByTokens => {
    return poolsByTokens.sort((poolA, poolB) => {
      const [tokenA, tokenB] = poolA.token_account_ids;
      return JSBI__default["default"].greaterThan(JSBI__default["default"].BigInt(poolB.reserves.get(tokenA) || ZERO), JSBI__default["default"].BigInt(poolA.reserves.get(tokenA) || ZERO)) && JSBI__default["default"].greaterThan(JSBI__default["default"].BigInt(poolB.reserves.get(tokenB) || ZERO), JSBI__default["default"].BigInt(poolA.reserves.get(tokenB) || ZERO)) ? 1 : -1;
    })[0];
  }); // console.log('uniqPoolsByAmounts', uniqPoolsByAmounts);

  return uniqPoolsByAmounts;
};

const filterMostLiquidUniqPools = pools => {
  const notEmptyPools = filterEmptyPools(pools);
  const simplePools = notEmptyPools.filter(pool => pool.pool_kind === 'SIMPLE_POOL');
  const mostLiquidPools = getMostLiquidPools(simplePools);
  return mostLiquidPools;
};

const getNumberOfPools = async ({
  provider,
  ammId
}) => {
  const poolsNumber = await provider.query({
    request_type: 'call_function',
    account_id: ammId,
    method_name: 'get_number_of_pools',
    args_base64: Buffer.from(JSON.stringify({})).toString('base64'),
    finality: 'optimistic'
  }).then(res => JSON.parse(Buffer.from(res.result).toString()));
  return poolsNumber;
};

const parseSimplePool = (pool, id) => {
  return { ...pool,
    id,
    reserves: createReserves(pool)
  };
};

const loadSimplePool = async ({
  provider,
  ammId,
  poolId
}) => {
  const pool = await provider.query({
    request_type: 'call_function',
    account_id: ammId,
    method_name: 'get_pool',
    args_base64: Buffer.from(JSON.stringify({
      pool_id: poolId
    })).toString('base64'),
    finality: 'optimistic'
  }).then(res => JSON.parse(Buffer.from(res.result).toString()));
  const parsedPool = parseSimplePool(pool, poolId);
  return parsedPool;
};

const loadPool = async ({
  provider,
  ammId,
  poolId,
  poolKind
}) => {
  if (poolKind) {
    switch (poolKind) {
      case 'STABLE_SWAP':
        return await getStablePool(provider, ammId, poolId);

      case 'RATED_SWAP':
        return await getRatedPool(provider, ammId, poolId);

      default:
        // @ts-ignore
        return await loadSimplePool({
          provider,
          ammId,
          poolId
        });
    }
  } else {
    // @ts-ignore
    return await loadSimplePool({
      provider,
      ammId,
      poolId
    });
  }
};

const loadPools = async ({
  provider,
  ammId,
  index = 0,
  limit
}) => {
  const pools = await provider.query({
    request_type: 'call_function',
    account_id: ammId,
    method_name: 'get_pools',
    args_base64: Buffer.from(JSON.stringify({
      from_index: index,
      limit
    })).toString('base64'),
    finality: 'optimistic'
  }).then(res => JSON.parse(Buffer.from(res.result).toString()));
  return pools;
};

const parseStableSwapPool = (pool, id) => {
  const STABLE_SWAP_LP_DECIMALS = 18;
  return { ...pool,
    id,
    reserves: createReserves(pool),
    cAmountReserves: createCAmountReserves(pool),
    decimals: createCorrelation(pool.token_account_ids, pool.decimals),
    // @ts-ignore
    rates: createCorrelation(pool.token_account_ids, pool.c_amounts.map(() => addDecimals(JSBI__default["default"].BigInt(1), STABLE_SWAP_LP_DECIMALS))),
    pool_kind: 'STABLE_SWAP'
  };
};

async function getStablePool(provider, exchange, poolId) {
  const pool = await provider.query({
    request_type: 'call_function',
    account_id: exchange,
    method_name: 'get_stable_pool',
    args_base64: Buffer.from(JSON.stringify({
      pool_id: poolId
    })).toString('base64'),
    finality: 'optimistic'
  }).then(res => JSON.parse(Buffer.from(res.result).toString()));
  return parseStableSwapPool(pool, poolId);
}

const parseRatedPool = (pool, poolId) => {
  return { ...pool,
    id: poolId,
    reserves: createReserves(pool),
    cAmountReserves: createCAmountReserves(pool),
    decimals: createCorrelation(pool.token_account_ids, pool.decimals),
    rates: createCorrelation(pool.token_account_ids, pool.rates.map(r => JSBI__default["default"].BigInt(r))),
    pool_kind: 'RATED_SWAP'
  };
};
/**
 * Fetch a rated pool. Rated pools are an improved version of stable pools.
 * @param provider
 * @param poolId
 * @returns
 */


async function getRatedPool(provider, exchange, poolId) {
  const pool = await provider.query({
    request_type: 'call_function',
    account_id: exchange,
    method_name: 'get_rated_pool',
    args_base64: Buffer.from(JSON.stringify({
      pool_id: poolId
    })).toString('base64'),
    finality: 'optimistic'
  }).then(res => JSON.parse(Buffer.from(res.result).toString()));
  return parseRatedPool(pool, poolId);
}

const loadAllPools = async ({
  provider,
  ammId
}) => {
  const numberOfPools = await getNumberOfPools({
    provider,
    ammId
  });
  let poolsCounter = 0;
  let poolsPromises = [];
  const poolsBatchToLoad = 500;

  while (numberOfPools > poolsCounter) {
    const poolsBatchPromise = loadPools({
      provider,
      ammId,
      index: poolsCounter,
      limit: poolsBatchToLoad
    });
    poolsPromises.push(poolsBatchPromise);
    poolsCounter += poolsBatchToLoad;
  }

  const pools = (await Promise.all(poolsPromises)).flat();
  const poolsWithIndexes = pools.map((pool, index) => parseSimplePool(pool, index)); // @ts-ignore

  const simplePools = poolsWithIndexes.filter(pool => pool.pool_kind === 'SIMPLE_POOL');
  const rawStablePools = poolsWithIndexes.filter(pool => pool.pool_kind !== 'SIMPLE_POOL');
  const stablePools = await Promise.all(rawStablePools.map(pool => {
    if (pool.pool_kind === 'STABLE_SWAP') {
      return getStablePool(provider, ammId, pool.id);
    } else {
      return getRatedPool(provider, ammId, pool.id);
    }
  }));
  return {
    simplePools,
    stablePools
  };
}; // will test later

async function createRefTransactions({
  user,
  swapSteps
}) {
  const transactions = []; // works only for 1 and 2 steps route, if there will be 3 and more steps
  // in future - we'll need to update it

  const actionsList = swapSteps.map((swapStep, index, arr) => {
    const {
      amm,
      inputMint,
      outputMint,
      amountIn,
      minAmountOut
    } = swapStep;
    const commonActionInfo = {
      pool_id: amm.instanceId,
      token_in: inputMint,
      token_out: outputMint
    };
    const isFirstSwapStep = index === 0;
    const isMultiHop = arr.length > 1; // for direct route specify both amount in & out

    if (!isMultiHop) {
      return { ...commonActionInfo,
        amount_in: amountIn.toString(),
        min_amount_out: minAmountOut.toString()
      };
    } // for first step in multi hop we skip min amount out and specify iy only
    // on last step of swap route


    if (isFirstSwapStep) {
      return { ...commonActionInfo,
        amount_in: amountIn.toString(),
        min_amount_out: '0'
      };
    } // for last step we specify only min amount out - so we take all amount out from
    // prev step as amount in, and fail automatically if it's less then needed for min_amount_out


    return {
      pool_id: amm.instanceId,
      token_in: inputMint,
      token_out: outputMint,
      min_amount_out: minAmountOut.toString()
    };
  });
  const {
    amm: commonAMM,
    inputMint,
    amountIn
  } = swapSteps[0];
  transactions.push({
    receiverId: inputMint,
    signerId: user,
    actions: [{
      type: 'FunctionCall',
      params: {
        methodName: 'ft_transfer_call',
        args: {
          receiver_id: commonAMM.contractId,
          amount: amountIn.toString(),
          msg: JSON.stringify({
            force: 0,
            actions: actionsList
          }),
          memo: MEMO
        },
        gas: DEFAULT_GAS,
        deposit: '1'
      }
    }]
  });
  return transactions;
}

const FEE_DIVISOR$1 = /*#__PURE__*/JSBI__default["default"].BigInt(10000); // From ref.finance/jumbo specs

function getOutputAmount({
  reserves,
  poolFee = 0,
  slippage,
  inputMint,
  outputMint,
  inputAmount
}) {
  const inputPoolBalance = reserves.get(inputMint) || ZERO;
  const outputPoolBalance = reserves.get(outputMint) || ZERO;

  if (JSBI__default["default"].equal(inputPoolBalance, ZERO) || JSBI__default["default"].equal(outputPoolBalance, ZERO)) {
    return {
      amountIn: inputAmount,
      amountOut: ZERO,
      minAmountOut: ZERO,
      feeAmount: ZERO,
      notEnoughLiquidity: true,
      priceImpact: 0
    };
  }

  const feeAmount = JSBI__default["default"].divide(JSBI__default["default"].multiply(JSBI__default["default"].BigInt(poolFee), inputAmount), FEE_DIVISOR$1);
  const inputAmountLessFees = JSBI__default["default"].subtract(inputAmount, feeAmount);
  const numerator = JSBI__default["default"].multiply(inputAmountLessFees, outputPoolBalance);
  const denominator = JSBI__default["default"].add(inputPoolBalance, inputAmountLessFees);
  const amountOut = JSBI__default["default"].divide(numerator, denominator);
  const amountOutLessSlippage = slippage.getFor(amountOut);
  const finalPrice = +inputPoolBalance.toString() / +outputPoolBalance.toString();
  const newPrice = +inputAmount.toString() / +amountOut.toString();
  const priceImpact = (newPrice - finalPrice) / newPrice;
  return {
    notEnoughLiquidity: false,
    amountIn: inputAmount,
    amountOut,
    minAmountOut: amountOutLessSlippage,
    feeAmount,
    priceImpact
  };
}

function getInputAmount({
  reserves,
  poolFee = 0,
  slippage,
  inputMint,
  outputMint,
  outputAmount
}) {
  const inputPoolBalance = reserves.get(inputMint) || ZERO;
  const outputPoolBalance = reserves.get(outputMint) || ZERO;

  if (JSBI__default["default"].equal(inputPoolBalance, ZERO) || JSBI__default["default"].equal(outputPoolBalance, ZERO)) {
    return {
      amountIn: ZERO,
      amountOut: outputAmount,
      minAmountOut: outputAmount,
      feeAmount: ZERO,
      notEnoughLiquidity: true,
      priceImpact: 0
    };
  }

  const numerator = JSBI__default["default"].multiply(outputAmount, inputPoolBalance);
  const denominator = JSBI__default["default"].subtract(outputPoolBalance, outputAmount);
  const amountIn = JSBI__default["default"].divide(numerator, denominator);
  const feeAmount = JSBI__default["default"].divide(JSBI__default["default"].multiply(JSBI__default["default"].BigInt(poolFee), amountIn), FEE_DIVISOR$1);
  const amountInWithFees = JSBI__default["default"].add(amountIn, feeAmount);
  const slippageAmount = JSBI__default["default"].divide(JSBI__default["default"].multiply(outputAmount, slippage.numerator), slippage.denominator);
  const minAmountOut = JSBI__default["default"].subtract(outputAmount, slippageAmount);
  const finalPrice = +inputPoolBalance.toString() / +outputPoolBalance.toString();
  const newPrice = +amountInWithFees.toString() / +outputAmount.toString();
  const priceImpact = (newPrice - finalPrice) / newPrice;
  return {
    notEnoughLiquidity: false,
    amountIn: amountInWithFees,
    amountOut: outputAmount,
    minAmountOut,
    feeAmount,
    priceImpact
  };
}

const calc_d = ({
  pool
}) => {
  const {
    amp,
    cAmountReserves
  } = pool;
  const token_num = cAmountReserves.size;
  const numReserves = Array.from(cAmountReserves.values()).map(v => +v.toString());
  const sum_amounts = numReserves.reduce((acc, amount) => acc + amount, 0);
  let d_prev = 0;
  let d = sum_amounts;

  for (let i = 0; i < 256; i++) {
    let d_prod = d;

    for (const c_amount of numReserves) {
      d_prod = d_prod * d / (c_amount * token_num);
    }

    d_prev = d;
    const ann = amp * token_num ** token_num;
    const numerator = d_prev * (d_prod * token_num + ann * sum_amounts);
    const denominator = d_prev * (ann - 1) + d_prod * (token_num + 1);
    d = numerator / denominator;
    if (Math.abs(d - d_prev) <= 1) break;
  }

  return d;
};
const calc_y = ({
  pool,
  x_c_amount,
  tokenInId,
  tokenOutId
}) => {
  const token_num = pool.cAmountReserves.size;
  const ann = pool.amp * token_num ** token_num;
  const d = calc_d({
    pool
  });
  let s = x_c_amount;
  let c = d * d / x_c_amount; // need for 3-token pools

  for (const [token, amount] of pool.cAmountReserves) {
    if (token !== tokenInId && token !== tokenOutId) {
      const numAmount = +amount.toString();
      s += numAmount;
      c = c * d / numAmount;
    }
  }

  c = c * d / (ann * token_num ** token_num);
  const b = d / ann + s;
  let y_prev = 0;
  let y = d;

  for (let i = 0; i < 256; i++) {
    y_prev = y;
    const y_numerator = y ** 2 + c;
    const y_denominator = 2 * y + b - d;
    y = y_numerator / y_denominator;
    if (Math.abs(y - y_prev) <= 1) break;
  }

  return y;
};
const FEE_DIVISOR = 10000;

const tradeFee = (amount, trade_fee) => {
  return JSBI__default["default"].divide(JSBI__default["default"].multiply(amount, trade_fee), JSBI__default["default"].BigInt(FEE_DIVISOR));
};

function calc_swap({
  pool,
  tokenInId,
  tokenOutId,
  amountIn
}) {
  const inputTokenBalance = pool.cAmountReserves.get(tokenInId) || '0';
  const y = calc_y({
    pool,
    x_c_amount: +JSBI__default["default"].add(amountIn, JSBI__default["default"].BigInt(inputTokenBalance)).toString(),
    tokenInId,
    tokenOutId
  });
  const outputTokenBalance = pool.cAmountReserves.get(tokenOutId) || '0';
  const amountOut = JSBI__default["default"].BigInt(+outputTokenBalance.toString() - y);
  const fee = tradeFee(amountOut, JSBI__default["default"].BigInt(pool.total_fee));
  const amountOutLessFees = JSBI__default["default"].subtract(amountOut, fee);
  return [amountOutLessFees, fee];
} // TODO: add output types

function getStableOutputAmount({
  tokenInId,
  tokenOutId,
  slippage,
  amountIn,
  stablePool
}) {
  // hardcoded decimals for tokens in pool
  const STABLE_LP_TOKEN_DECIMALS = stablePool.pool_kind === 'STABLE_SWAP' ? 18 : 24;
  const inputTokenDecimals = stablePool.decimals.get(tokenInId) || null;
  const outputTokenDecimals = stablePool.decimals.get(tokenOutId) || null;

  if (inputTokenDecimals === null || outputTokenDecimals === null) {
    console.error({
      inputTokenDecimals,
      outputTokenDecimals,
      stablePool,
      tokenInId,
      tokenOutId
    });
    throw new Error('No info about decimals of tokens');
  } // amount * rate / stable lp


  const updatedCReservesNum = Array.from(stablePool.cAmountReserves.entries()).map(([tokenId, amount]) => {
    const rate = stablePool.rates.get(tokenId) || null;

    if (!rate) {
      throw new Error('No rate for token');
    }

    return [tokenId, removeDecimals(JSBI__default["default"].multiply(amount, rate), STABLE_LP_TOKEN_DECIMALS)];
  });
  const updatedCReserves = updatedCReservesNum.reduce((acc, [tokenId, amount]) => acc.set(tokenId, amount), new Map());
  const updatedStablePool = { ...stablePool,
    cAmountReserves: updatedCReserves
  }; // change decimals from one to another

  const amountInWithHardcodedDecimals = changeDecimals(amountIn, inputTokenDecimals, STABLE_LP_TOKEN_DECIMALS);
  const inputPoolBalance = updatedCReserves.get(tokenInId) || ZERO;
  const outputPoolBalance = updatedCReserves.get(tokenOutId) || ZERO;

  if (JSBI__default["default"].equal(inputPoolBalance, ZERO) || JSBI__default["default"].equal(outputPoolBalance, ZERO)) {
    return {
      amountIn,
      amountOut: ZERO,
      minAmountOut: ZERO,
      feeAmount: ZERO,
      notEnoughLiquidity: true,
      priceImpact: 0
    };
  }

  const [amount_swapped, fee] = calc_swap({
    tokenInId,
    amountIn: amountInWithHardcodedDecimals,
    tokenOutId,
    pool: updatedStablePool
  });
  const rateIn = stablePool.rates.get(tokenInId) || null;
  const rateOut = stablePool.rates.get(tokenOutId) || null;

  if (!rateIn || !rateOut) {
    throw new Error('No rate for in or out token');
  }

  const amountOutWithRate = JSBI__default["default"].divide(addDecimals(amount_swapped, STABLE_LP_TOKEN_DECIMALS), rateOut);
  const feeWithRate = JSBI__default["default"].divide(addDecimals(fee, STABLE_LP_TOKEN_DECIMALS), rateOut);
  const amountOutWithTokenDecimals = changeDecimals(amountOutWithRate, STABLE_LP_TOKEN_DECIMALS, outputTokenDecimals);
  const feeAmountWithTokenDecimals = changeDecimals(feeWithRate, STABLE_LP_TOKEN_DECIMALS, outputTokenDecimals);
  const minAmountOut = slippage.getFor(amountOutWithTokenDecimals);
  const marketPrice = +rateOut.toString() / +rateIn.toString();
  const newMarketPrice = +amountInWithHardcodedDecimals.toString() / +amount_swapped.toString();
  const priceImpact = (newMarketPrice - marketPrice) / newMarketPrice;
  return {
    notEnoughLiquidity: false,
    amountIn,
    amountOut: amountOutWithTokenDecimals,
    minAmountOut,
    feeAmount: feeAmountWithTokenDecimals,
    priceImpact
  };
} // TODO: separate & pass swap func as param

const createSwapOptions = params => {
  const {
    stablePool,
    tokenInId,
    tokenOutId,
    slippage,
    minAmount,
    maxAmount,
    numberOfSteps = 200
  } = params;
  const stepSize = JSBI__default["default"].divide(JSBI__default["default"].subtract(maxAmount, minAmount), JSBI__default["default"].BigInt(numberOfSteps));
  const swapOptions = Array.from(Array(numberOfSteps).keys()).map(v => v + 1).map(iteration => {
    const amountIn = JSBI__default["default"].add(minAmount, JSBI__default["default"].multiply(stepSize, JSBI__default["default"].BigInt(iteration)));
    const {
      notEnoughLiquidity,
      amountOut,
      minAmountOut,
      feeAmount,
      priceImpact
    } = getStableOutputAmount({
      amountIn,
      tokenOutId,
      tokenInId,
      slippage,
      stablePool
    });
    return {
      priceImpact,
      notEnoughLiquidity,
      amountIn,
      amountOut,
      minAmountOut,
      feeAmount
    };
  });
  return swapOptions;
};

const findBestOption = params => {
  const {
    stablePool,
    tokenInId,
    tokenOutId,
    outputAmount,
    slippage,
    appproxInputAmount,
    minAmountMultiplier = 0,
    maxAmountMultiplier = 2,
    numberOfSteps = 200
  } = params;
  const minAmount = removeDecimals(JSBI__default["default"].multiply(appproxInputAmount, JSBI__default["default"].BigInt(minAmountMultiplier * 10 ** 3)), 3);
  const maxAmount = removeDecimals(JSBI__default["default"].multiply(appproxInputAmount, JSBI__default["default"].BigInt(maxAmountMultiplier * 10 ** 3)), 3); // create array of results swapping tokenA-tokenB and tokenB-tokenA

  const swapResults = createSwapOptions({
    stablePool,
    tokenInId,
    tokenOutId,
    slippage,
    minAmount,
    maxAmount,
    numberOfSteps
  }); // take the closes one to pool amount ratio - user amount ratio

  const swapAmounts = swapResults.map(ratios => {
    const {
      amountOut
    } = ratios;
    const swapAmountOutDiff = JSBI__default["default"].subtract(amountOut, outputAmount);
    const absDiff = JSBI__default["default"].lessThan(swapAmountOutDiff, ZERO) ? JSBI__default["default"].unaryMinus(swapAmountOutDiff) : swapAmountOutDiff;
    return { ...ratios,
      swapAmountOutDiff: absDiff
    };
  }).sort((ratioA, ratioB) => JSBI__default["default"].equal(ratioA.swapAmountOutDiff, ratioB.swapAmountOutDiff) ? 0 : JSBI__default["default"].lessThan(ratioA.swapAmountOutDiff, ratioB.swapAmountOutDiff) ? -1 : 1);
  return swapAmounts[0];
}; // TODO: update this method to do it by calculations, not searching the best match


const getStableInputAmount = ({
  tokenInId,
  tokenOutId,
  amountOut,
  slippage,
  stablePool
}) => {
  // we expect that it's almost the same
  const appproxInputAmount = amountOut;
  let bestOption = null;
  const numberOfIterations = 2;

  for (let i = 0; i < numberOfIterations; i += 1) {
    if (!bestOption) {
      bestOption = findBestOption({
        stablePool,
        tokenInId,
        tokenOutId,
        slippage,
        outputAmount: amountOut,
        appproxInputAmount,
        numberOfSteps: 200
      });
    } else {
      bestOption = findBestOption({
        stablePool,
        tokenInId,
        tokenOutId,
        slippage,
        outputAmount: amountOut,
        appproxInputAmount: bestOption.amountIn,
        minAmountMultiplier: 0.95,
        maxAmountMultiplier: 1.05,
        numberOfSteps: 200
      });
    }
  }

  if (!bestOption) {
    throw new Error('No best option for getInputAmount');
  }

  return bestOption;
};

class Jumbo {
  constructor(pool) {
    this.id = void 0;
    this.contractId = void 0;
    this.instanceId = void 0;
    this.label = void 0;
    this.pool = void 0;
    this.isSimplePool = void 0;
    this.reserves = void 0;
    this.label = 'Jumbo';
    this.id = `${pool.id}`;
    this.contractId = JUMBO_ID;
    this.instanceId = pool.id;
    this.pool = pool;
    this.isSimplePool = pool.pool_kind === 'SIMPLE_POOL';
    this.reserves = pool.reserves;
  }

  static async loadPools({
    provider
  }) {
    try {
      const {
        simplePools,
        stablePools
      } = await loadAllPools({
        provider,
        ammId: JUMBO_ID
      });
      const mostLiquidPools = filterMostLiquidUniqPools(simplePools);
      return [...mostLiquidPools, ...stablePools].map(pool => new Jumbo(pool));
    } catch (e) {
      console.log('Error loading pools for Ref Finance', e);
    }

    return [];
  }

  getQuote(quoteParams) {
    const {
      inputMint,
      outputMint,
      amount,
      slippage,
      swapMode
    } = quoteParams;
    const feePct = this.pool.total_fee / 10000;

    if (swapMode === exports.SwapMode.ExactIn) {
      if (this.isSimplePool) {
        const {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feeAmount,
          priceImpact
        } = getOutputAmount({
          reserves: this.pool.reserves,
          poolFee: this.pool.total_fee,
          inputMint,
          outputMint,
          inputAmount: amount,
          slippage
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      } else {
        const {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feeAmount,
          priceImpact
        } = getStableOutputAmount({
          tokenInId: inputMint,
          tokenOutId: outputMint,
          slippage,
          // @ts-ignore
          stablePool: this.pool,
          amountIn: amount
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      }
    } else if (swapMode === exports.SwapMode.ExactOut) {
      if (this.isSimplePool) {
        const {
          amountIn,
          amountOut,
          minAmountOut,
          feeAmount,
          priceImpact,
          notEnoughLiquidity
        } = getInputAmount({
          reserves: this.pool.reserves,
          poolFee: this.pool.total_fee,
          inputMint,
          outputMint,
          outputAmount: amount,
          slippage
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      } else {
        const {
          notEnoughLiquidity,
          feeAmount,
          amountIn,
          amountOut,
          minAmountOut,
          priceImpact
        } = getStableInputAmount({
          tokenInId: inputMint,
          tokenOutId: outputMint,
          slippage,
          // @ts-ignore
          stablePool: this.pool,
          amountOut: amount
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      }
    }

    throw new Error('Unknown swap mode type');
  }

  async getPromiseForUpdate({
    provider
  }) {
    return loadPool({
      provider,
      ammId: this.contractId,
      poolId: this.instanceId,
      poolKind: this.pool.pool_kind
    }).then(pool => {
      this.pool = pool;
    });
  }

  async createSwapInstructions(params) {
    const {
      user,
      swapStep
    } = params;
    const swapTransactions = await createRefTransactions({
      user,
      swapSteps: [swapStep]
    });
    console.log('swapTransactions', swapTransactions);
    return swapTransactions;
  }

  async createSwapRouteInstructions(params) {
    const {
      user,
      swapRoute
    } = params;
    const swapTransactions = await createRefTransactions({
      user,
      swapSteps: swapRoute.steps
    });
    console.log('swapTransactions', swapTransactions);
    return swapTransactions;
  }

  get reserveTokenMints() {
    return this.pool.token_account_ids;
  }

}

class RefFinance {
  constructor(pool) {
    this.id = void 0;
    this.contractId = void 0;
    this.instanceId = void 0;
    this.pool = void 0;
    this.isSimplePool = void 0;
    this.label = void 0;
    this.label = 'Ref.Finance';
    this.id = `${pool.id}`;
    this.contractId = REF_FINANCE_ID;
    this.instanceId = pool.id;
    this.pool = pool;
    this.isSimplePool = pool.pool_kind === 'SIMPLE_POOL';
  }

  static async loadPools({
    provider
  }) {
    try {
      const {
        simplePools,
        stablePools
      } = await loadAllPools({
        provider,
        ammId: REF_FINANCE_ID
      });
      const mostLiquidSimplePools = filterMostLiquidUniqPools(simplePools);
      return [...mostLiquidSimplePools, ...stablePools].map(pool => new RefFinance(pool));
    } catch (e) {
      console.log('Error loading pools for Ref Finance', e);
    }

    return [];
  }

  getQuote(quoteParams) {
    const {
      inputMint,
      outputMint,
      amount,
      slippage,
      swapMode
    } = quoteParams;
    const feePct = this.pool.total_fee / 10000;

    if (swapMode === exports.SwapMode.ExactIn) {
      if (this.isSimplePool) {
        const {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feeAmount,
          priceImpact
        } = getOutputAmount({
          reserves: this.pool.reserves,
          poolFee: this.pool.total_fee,
          inputMint,
          outputMint,
          inputAmount: amount,
          slippage
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      } else {
        const {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feeAmount,
          priceImpact
        } = getStableOutputAmount({
          tokenInId: inputMint,
          tokenOutId: outputMint,
          slippage,
          // @ts-ignore
          stablePool: this.pool,
          amountIn: amount
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      }
    } else if (swapMode === exports.SwapMode.ExactOut) {
      if (this.isSimplePool) {
        const {
          amountIn,
          amountOut,
          minAmountOut,
          feeAmount,
          priceImpact,
          notEnoughLiquidity
        } = getInputAmount({
          reserves: this.pool.reserves,
          poolFee: this.pool.total_fee,
          inputMint,
          outputMint,
          outputAmount: amount,
          slippage
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      } else {
        const {
          notEnoughLiquidity,
          feeAmount,
          amountIn,
          amountOut,
          minAmountOut,
          priceImpact
        } = getStableInputAmount({
          tokenInId: inputMint,
          tokenOutId: outputMint,
          slippage,
          // @ts-ignore
          stablePool: this.pool,
          amountOut: amount
        });
        return {
          notEnoughLiquidity,
          amountIn,
          amountOut,
          minAmountOut,
          feePct,
          feeMint: inputMint,
          feeAmount,
          priceImpact
        };
      }
    }

    throw new Error('Unknown swap mode type');
  }

  async getPromiseForUpdate({
    provider
  }) {
    return loadPool({
      provider,
      ammId: this.contractId,
      poolId: this.instanceId,
      poolKind: this.pool.pool_kind
    }).then(pool => {
      this.pool = pool;
    });
  }

  async createSwapInstructions(params) {
    const {
      user,
      swapStep
    } = params;
    const swapTransactions = await createRefTransactions({
      user,
      swapSteps: [swapStep]
    });
    console.log('swapTransactions', swapTransactions);
    return swapTransactions;
  }

  async createSwapRouteInstructions(params) {
    const {
      user,
      swapRoute
    } = params;
    const swapTransactions = await createRefTransactions({
      user,
      swapSteps: swapRoute.steps
    });
    console.log('swapTransactions', swapTransactions);
    return swapTransactions;
  }

  get reserveTokenMints() {
    return this.pool.token_account_ids;
  }

}

const SLIPPAGE_NUMERATOR = 10000;
const SLIPPAGE_DENOMINATOR = 1000000;
const FEE_BPS_DENOMINATOR = 100000;
class Percentage {
  constructor(numerator, denominator) {
    this.numerator = void 0;
    this.denominator = void 0;

    this.toString = () => {
      return `${this.numerator.toString()}/${this.denominator.toString()}`;
    };

    this.numerator = numerator;
    this.denominator = denominator;
  }

  static fromSlippageNumber(num) {
    return new Percentage(JSBI__default["default"].BigInt(num * SLIPPAGE_NUMERATOR), JSBI__default["default"].BigInt(SLIPPAGE_DENOMINATOR));
  }

  static fromFeeBpsNumber(num) {
    return new Percentage(JSBI__default["default"].BigInt(num), JSBI__default["default"].BigInt(FEE_BPS_DENOMINATOR));
  }

  getFor(amount) {
    const numerator = JSBI__default["default"].BigInt(this.numerator.toString());
    const denominator = JSBI__default["default"].BigInt(this.denominator.toString());
    return JSBI__default["default"].divide(JSBI__default["default"].multiply(amount, JSBI__default["default"].subtract(denominator, numerator)), denominator);
  }

  getFrom(amount) {
    const numerator = JSBI__default["default"].BigInt(this.numerator.toString());
    const denominator = JSBI__default["default"].BigInt(this.denominator.toString());
    return JSBI__default["default"].divide(JSBI__default["default"].multiply(amount, numerator), denominator);
  }

}

const loadAccountStorageBalance = async ({
  provider,
  tokenId,
  tokenOwnerId
}) => {
  if (!tokenId || !tokenOwnerId) {
    console.error('No token id or token owner id for loading account storage balance', `tokenId: ${tokenId}`, `tokenOwnerId: ${tokenOwnerId}`);
    return {
      tokenId,
      existing: false,
      storageBalance: null
    };
  }

  const res = await provider.query({
    request_type: 'call_function',
    account_id: tokenId,
    method_name: 'storage_balance_of',
    args_base64: Buffer.from(JSON.stringify({
      account_id: tokenOwnerId
    })).toString('base64'),
    finality: 'optimistic'
  }).then(res => JSON.parse(Buffer.from(res.result).toString()));
  return {
    tokenId,
    existing: res !== null,
    storageBalance: res
  };
};

async function registerToken(provider, tokenId, user) {
  const tokenOutActions = new Array();
  const {
    storageBalance: tokenRegistered
  } = await loadAccountStorageBalance({
    provider,
    tokenId,
    tokenOwnerId: user
  });

  if (tokenRegistered) {
    return undefined;
  }

  tokenOutActions.push({
    type: 'FunctionCall',
    params: {
      methodName: 'storage_deposit',
      args: {
        registration_only: true,
        account_id: user
      },
      gas: DEFAULT_GAS,
      deposit: STORAGE_TO_REGISTER_WITH_MFT
    }
  });
  return {
    receiverId: tokenId,
    signerId: user,
    actions: tokenOutActions
  };
}

const builDepositNearActions = async (account, amount) => {
  const actions = new Array();
  const registerTokenTx = await registerToken(account.connection.provider, WRAPPED_NEAR_ID, account.accountId);
  let deposit = amount;

  if (registerTokenTx) {
    actions.push(...registerTokenTx.actions);
  } else {
    const balance = await account.viewFunction(WRAPPED_NEAR_ID, 'ft_balance_of', {
      account_id: account.accountId
    });

    if (JSBI__default["default"].greaterThanOrEqual(JSBI__default["default"].BigInt(balance), deposit)) {
      return [];
    }

    console.log('NEAR account found, balance:', balance);
    deposit = JSBI__default["default"].subtract(amount, JSBI__default["default"].BigInt(balance));
  }

  actions.push({
    type: 'FunctionCall',
    params: {
      methodName: 'near_deposit',
      args: {},
      gas: DEFAULT_GAS,
      deposit: deposit.toString()
    }
  });
  return actions;
};
const buildDepositNearTransaction = async (account, amount) => {
  const transaction = {
    receiverId: WRAPPED_NEAR_ID,
    signerId: account.accountId,
    actions: await builDepositNearActions(account, amount)
  };
  return transaction;
};

const builWithdrawNearActions = async amount => {
  const actions = new Array();
  const withdrawAmount = amount.toString();
  actions.push({
    type: 'FunctionCall',
    params: {
      methodName: 'near_withdraw',
      args: {
        amount: withdrawAmount
      },
      gas: DEFAULT_GAS,
      deposit: '1'
    }
  }); // TBD: close wrapped account/return deposit

  return actions;
};
const buildWithdrawNearTransaction = async (signerId, amount) => {
  const transaction = {
    receiverId: WRAPPED_NEAR_ID,
    signerId,
    actions: await builWithdrawNearActions(amount)
  };
  return transaction;
};

const callFunction = async params => {
  const {
    provider,
    accountId,
    method,
    args = {}
  } = params;
  const response = await provider.query({
    request_type: 'call_function',
    account_id: accountId,
    method_name: method,
    args_base64: Buffer.from(JSON.stringify(args)).toString('base64'),
    finality: 'optimistic'
  });
  const parsedResponse = JSON.parse(Buffer.from(response.result).toString());
  return parsedResponse;
};

const SPIN_CONTRACT_ADDRESS = 'spot.spin-fi.near';

const NATIVE_NEAR_ADDRESS = 'near.near';
class SpinFinanceMarket {
  constructor(rawMarket) {
    this.rawMarket = void 0;
    this.label = 'Spin Finance';
    this.id = void 0;
    this.reserveTokenMints = void 0;
    this.contractId = SPIN_CONTRACT_ADDRESS;
    this.instanceId = void 0;
    this.orderBook = undefined;
    this.rawMarket = rawMarket;
    this.id = `${rawMarket.id}`;
    this.instanceId = rawMarket.id; // Pass wrapped near to the router

    this.reserveTokenMints = [rawMarket.base.address, rawMarket.quote.address].map(_ => _ === NATIVE_NEAR_ADDRESS ? WRAPPED_NEAR_ID : _);
  }

  static async loadUserDeposits({
    user,
    provider
  }) {
    const deposits = await callFunction({
      provider,
      accountId: SPIN_CONTRACT_ADDRESS,
      method: 'get_deposits',
      args: {
        account_id: user
      }
    });
    return deposits;
  }

  static createWithdrawFromDepositsTransaction({
    user,
    token,
    amount
  }) {
    const isNearToken = token === NATIVE_NEAR_ADDRESS;
    const transaction = {
      receiverId: SPIN_CONTRACT_ADDRESS,
      signerId: user,
      actions: [{
        type: 'FunctionCall',
        params: {
          methodName: 'withdraw',
          args: {
            token: isNearToken ? NATIVE_NEAR_ADDRESS : token,
            amount
          },
          gas: DEFAULT_GAS,
          deposit: isNearToken ? '0' : '1'
        }
      }]
    }; // @ts-ignore

    return transaction;
  }

  async createSwapInstructions(swapParams) {
    const {
      user,
      swapStep,
      provider
    } = swapParams;
    const transactions = [];
    const deposits = await SpinFinanceMarket.loadUserDeposits({
      user,
      provider
    });
    const inputDepositToken = swapStep.inputMint === WRAPPED_NEAR_ID ? NATIVE_NEAR_ADDRESS : swapStep.inputMint;
    const existingAmount = JSBI__default["default"].BigInt(deposits[inputDepositToken] || '0');
    const {
      address: baseAddress
    } = this.rawMarket.base;
    const {
      address: quoteAddress
    } = this.rawMarket.quote;
    const isSellBase = baseAddress === swapStep.inputMint || baseAddress === NATIVE_NEAR_ADDRESS && swapStep.inputMint === WRAPPED_NEAR_ID;
    const isNativeMarket = baseAddress === NATIVE_NEAR_ADDRESS || quoteAddress === NATIVE_NEAR_ADDRESS; // Deposit if not enough

    if (JSBI__default["default"].lessThan(existingAmount, swapStep.amountIn)) {
      const amountToAdd = JSBI__default["default"].subtract(swapStep.amountIn, existingAmount); // Deposit native NEAR

      if (isNativeMarket && swapStep.inputMint === WRAPPED_NEAR_ID) {
        // Unwrap wrapped NEAR
        transactions.push(await buildWithdrawNearTransaction(user, amountToAdd)); // Deposit near

        transactions.push({
          receiverId: SPIN_CONTRACT_ADDRESS,
          signerId: user,
          actions: [{
            type: 'FunctionCall',
            params: {
              methodName: 'deposit_near',
              args: {},
              gas: DEFAULT_GAS,
              deposit: amountToAdd.toString()
            }
          }]
        });
      } else {
        // Deposit FT
        transactions.push({
          receiverId: swapStep.inputMint,
          signerId: user,
          actions: [{
            type: 'FunctionCall',
            params: {
              methodName: 'ft_transfer_call',
              args: {
                receiver_id: SPIN_CONTRACT_ADDRESS,
                amount: amountToAdd.toString(),
                msg: ''
              },
              gas: DEFAULT_GAS,
              deposit: '1'
            }
          }]
        });
      }
    }

    const methodName = isSellBase ? 'place_ask' : 'place_bid';
    const quoteNominator = 10 ** this.rawMarket.quote.decimal;
    const orderStep = new Decimal__default["default"](this.rawMarket.limits.step_size);
    let quantity = new Decimal__default["default"]((isSellBase ? swapStep.amountIn : swapStep.minAmountOut).toString()).div(orderStep).floor().mul(orderStep); // if we buy base then quantity is what we'll receive, but spin fi
    // charge fee from amount out, that's why we need to add it here

    if (!isSellBase) {
      quantity = quantity.add(swapStep.feeAmount.toString()).div(orderStep).ceil().mul(orderStep);
    }

    const quoteAmount = new Decimal__default["default"]((isSellBase ? swapStep.minAmountOut : swapStep.amountIn).toString()).div(quoteNominator);
    const tickSize = new Decimal__default["default"](this.rawMarket.limits.tick_size);
    const price = quoteAmount.mul(quoteNominator).div(tickSize).div(quantity.div(10 ** this.rawMarket.base.decimal)).floor().mul(tickSize); // Place market order

    transactions.push({
      receiverId: SPIN_CONTRACT_ADDRESS,
      signerId: user,
      actions: [{
        type: 'FunctionCall',
        params: {
          methodName,
          args: {
            market_id: this.rawMarket.id,
            price: price.ceil().toFixed(0),
            quantity: quantity.toFixed(0),
            market_order: true,
            memo: MEMO
          },
          gas: DEFAULT_GAS,
          deposit: '0'
        }
      }]
    });
    const withdrawAmount = swapStep.minAmountOut.toString();
    const withdrawToken = swapStep.outputMint === WRAPPED_NEAR_ID ? NATIVE_NEAR_ADDRESS : swapStep.outputMint; // Withdraw

    transactions.push(SpinFinanceMarket.createWithdrawFromDepositsTransaction({
      user,
      token: withdrawToken,
      amount: withdrawAmount
    }));

    if (isNativeMarket && swapStep.outputMint === WRAPPED_NEAR_ID) {
      // Wrap NEAR back
      transactions.push({
        receiverId: WRAPPED_NEAR_ID,
        signerId: user,
        actions: [{
          type: 'FunctionCall',
          params: {
            methodName: 'near_deposit',
            args: {},
            gas: DEFAULT_GAS,
            deposit: withdrawAmount
          }
        }]
      });
    }

    return transactions;
  }

  async createSwapRouteInstructions(swapParams) {
    const {
      provider,
      user,
      swapRoute
    } = swapParams;
    const transactions = [];

    for (let routeStep of swapRoute.steps) {
      const stepTransactions = await routeStep.amm.createSwapInstructions({
        provider,
        user,
        swapStep: routeStep
      });
      transactions.push(...stepTransactions);
    }

    return transactions;
  }

  async getPromiseForUpdate({
    provider
  }) {
    try {
      const orderBook = await callFunction({
        provider,
        accountId: SPIN_CONTRACT_ADDRESS,
        method: 'get_orderbook',
        args: {
          market_id: this.rawMarket.id,
          limit: 100
        }
      });
      this.orderBook = orderBook;
    } catch (e) {
      console.log('error getPromiseForUpdate spin for market', this.rawMarket.id);
    }
  }

  getQuote(quoteParams) {
    if (!this.orderBook) {
      throw new Error(`Order book for market ${this.rawMarket.ticker} is not loaded`);
    }

    const isSellBase = quoteParams.inputMint === this.rawMarket.base.address || quoteParams.inputMint === WRAPPED_NEAR_ID && this.rawMarket.base.address === NATIVE_NEAR_ADDRESS;
    const side = isSellBase ? this.orderBook.bid_orders : this.orderBook.ask_orders;
    const isAmountInBase = isSellBase && quoteParams.swapMode === exports.SwapMode.ExactIn || !isSellBase && quoteParams.swapMode === exports.SwapMode.ExactOut;
    let restUserAmount = new Decimal__default["default"](quoteParams.amount.toString());
    let amountIn = new Decimal__default["default"](0);
    let amountOut = new Decimal__default["default"](0);
    const baseMultiplier = new Decimal__default["default"](10).pow(this.rawMarket.base.decimal);
    const stepSize = new Decimal__default["default"](this.rawMarket.limits.step_size);
    const fee = new Decimal__default["default"](this.rawMarket.fees.taker_fee).div(10 ** this.rawMarket.fees.decimals);

    for (const order of side) {
      const price = new Decimal__default["default"](order.price);
      const restAmountInBase = isAmountInBase ? restUserAmount.div(stepSize).floor().mul(stepSize) : restUserAmount.mul(baseMultiplier).div(price).div(stepSize).floor().mul(stepSize);
      const orderAmount = new Decimal__default["default"](order.quantity);
      const takeFromLevelInBase = Decimal__default["default"].min(restAmountInBase, orderAmount);
      const takeFromLevelInQuote = takeFromLevelInBase.mul(price).div(baseMultiplier);
      amountIn = isSellBase ? amountIn.add(takeFromLevelInBase) : amountIn.add(takeFromLevelInQuote);
      amountOut = isSellBase ? amountOut.add(takeFromLevelInQuote) : amountOut.add(takeFromLevelInBase);
      const feeAmount = amountOut.mul(fee);
      const amountOutLessFee = amountOut.sub(feeAmount).floor();
      let minAmountOut = new Decimal__default["default"](quoteParams.slippage.getFor(JSBI__default["default"].BigInt(amountOutLessFee.floor().toString())).toString()); // after removing slippage part requires to be stripped

      if (!isSellBase) {
        minAmountOut = minAmountOut.div(stepSize).floor().mul(stepSize);
      }

      restUserAmount = restUserAmount.sub(isAmountInBase ? takeFromLevelInBase : takeFromLevelInQuote);

      if (takeFromLevelInBase.lessThanOrEqualTo(0)) {
        const amountInBase = isSellBase ? amountIn : minAmountOut;
        const amountInQuote = isSellBase ? minAmountOut : amountIn; // check market limits for base token

        const isAmountInBaseGreaterMinLimit = amountInBase.greaterThanOrEqualTo(new Decimal__default["default"](this.rawMarket.limits.min_base_quantity));
        const isAmountInBaseLessMaxLimit = amountInBase.lessThanOrEqualTo(new Decimal__default["default"](this.rawMarket.limits.max_base_quantity)); // check market limits for quote token

        const isAmountInQuoteGreaterMinLimit = amountInQuote.greaterThanOrEqualTo(new Decimal__default["default"](this.rawMarket.limits.min_quote_quantity));
        const isAmountInQuoteLessMaxLimit = amountInQuote.lessThanOrEqualTo(new Decimal__default["default"](this.rawMarket.limits.max_quote_quantity));
        return {
          amountIn: JSBI__default["default"].BigInt(amountIn.floor().toString()),
          amountOut: JSBI__default["default"].BigInt(amountOutLessFee.floor().toString()),
          minAmountOut: JSBI__default["default"].BigInt(minAmountOut.floor().toString()),
          feeAmount: JSBI__default["default"].BigInt(feeAmount.floor().toString()),
          feeMint: quoteParams.outputMint,
          feePct: parseFloat(this.rawMarket.fees.taker_fee) / 10 ** this.rawMarket.base.decimal,
          notEnoughLiquidity: !(isAmountInBaseGreaterMinLimit && isAmountInBaseLessMaxLimit && isAmountInQuoteGreaterMinLimit && isAmountInQuoteLessMaxLimit),
          priceImpact: 0
        };
      }
    }

    const feeAmount = amountOut.mul(fee);
    return {
      amountIn: JSBI__default["default"].BigInt(amountIn.floor().toString()),
      amountOut: JSBI__default["default"].BigInt(amountOut.sub(feeAmount).floor().toString()),
      minAmountOut: quoteParams.slippage.getFor(JSBI__default["default"].BigInt(amountOut.floor().toString())),
      feeAmount: JSBI__default["default"].BigInt(feeAmount.floor().toString()),
      feeMint: quoteParams.inputMint,
      feePct: parseFloat(this.rawMarket.fees.taker_fee) / 10 ** this.rawMarket.base.decimal,
      notEnoughLiquidity: true,
      priceImpact: 0
    };
  }

  static async loadMarkets(params) {
    const {
      provider
    } = params;
    const markets = await callFunction({
      accountId: SPIN_CONTRACT_ADDRESS,
      method: 'get_markets',
      provider
    });
    return markets.map(market => new SpinFinanceMarket(market));
  }

}

const TONIC_FEE_DIVISOR = 10000; // By design

const roundForStep = (n, step, up = false) => {
  JSBI__default["default"].BigInt(step);

  if (up) {
    return n.div(step).ceil().mul(step);
  }

  return n.div(step).floor().mul