/*
https://powerpool.finance/

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         ppwr rrr wppr0       prwwwrp                                 prwwwrp                   wr0
        rr 0rrrwrrprpwp0      pp   pr  prrrr0 pp   0r  prrrr0  0rwrrr pp   pr  prrrr0  prrrr0    r0
        rrp pr   wr00rrp      prwww0  pp   wr pp w00r prwwwpr  0rw    prwww0  pp   wr pp   wr    r0
        r0rprprwrrrp pr0      pp      wr   pr pp rwwr wr       0r     pp      wr   pr wr   pr    r0
         prwr wrr0wpwr        00        www0   0w0ww    www0   0w     00        www0    www0   0www0
          wrr ww0rrrr

*/

// File: contracts/balancer-core/BConst.sol

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.6.12;

contract BConst {
    uint public constant BONE              = 10**18;

    uint public constant MIN_BOUND_TOKENS  = 2;
    uint public constant MAX_BOUND_TOKENS  = 8;

    uint public constant MIN_FEE           = BONE / 10**6;
    uint public constant MAX_FEE           = BONE / 10;

    uint public constant MIN_WEIGHT        = BONE;
    uint public constant MAX_WEIGHT        = BONE * 50;
    uint public constant MAX_TOTAL_WEIGHT  = BONE * 50;
    uint public constant MIN_BALANCE       = BONE / 10**12;

    uint public constant INIT_POOL_SUPPLY  = BONE * 100;

    uint public constant MIN_BPOW_BASE     = 1 wei;
    uint public constant MAX_BPOW_BASE     = (2 * BONE) - 1 wei;
    uint public constant BPOW_PRECISION    = BONE / 10**10;

    uint public constant MAX_IN_RATIO      = BONE / 2;
    uint public constant MAX_OUT_RATIO     = (BONE / 3) + 1 wei;
}

// File: contracts/balancer-core/BNum.sol

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.6.12;


contract BNum is BConst {

    function btoi(uint a)
        internal pure 
        returns (uint)
    {
        return a / BONE;
    }

    function bfloor(uint a)
        internal pure
        returns (uint)
    {
        return btoi(a) * BONE;
    }

    function badd(uint a, uint b)
        internal pure
        returns (uint)
    {
        uint c = a + b;
        require(c >= a, "ERR_ADD_OVERFLOW");
        return c;
    }

    function bsub(uint a, uint b)
        internal pure
        returns (uint)
    {
        (uint c, bool flag) = bsubSign(a, b);
        require(!flag, "ERR_SUB_UNDERFLOW");
        return c;
    }

    function bsubSign(uint a, uint b)
        internal pure
        returns (uint, bool)
    {
        if (a >= b) {
            return (a - b, false);
        } else {
            return (b - a, true);
        }
    }

    function bmul(uint a, uint b)
        internal pure
        returns (uint)
    {
        uint c0 = a * b;
        require(a == 0 || c0 / a == b, "ERR_MUL_OVERFLOW");
        uint c1 = c0 + (BONE / 2);
        require(c1 >= c0, "ERR_MUL_OVERFLOW");
        uint c2 = c1 / BONE;
        return c2;
    }

    function bdiv(uint a, uint b)
        internal pure
        returns (uint)
    {
        require(b != 0, "ERR_DIV_ZERO");
        uint c0 = a * BONE;
        require(a == 0 || c0 / a == BONE, "ERR_DIV_INTERNAL"); // bmul overflow
        uint c1 = c0 + (b / 2);
        require(c1 >= c0, "ERR_DIV_INTERNAL"); //  badd require
        uint c2 = c1 / b;
        return c2;
    }

    // DSMath.wpow
    function bpowi(uint a, uint n)
        internal pure
        returns (uint)
    {
        uint z = n % 2 != 0 ? a : BONE;

        for (n /= 2; n != 0; n /= 2) {
            a = bmul(a, a);

            if (n % 2 != 0) {
                z = bmul(z, a);
            }
        }
        return z;
    }

    // Compute b^(e.w) by splitting it into (b^e)*(b^0.w).
    // Use `bpowi` for `b^e` and `bpowK` for k iterations
    // of approximation of b^0.w
    function bpow(uint base, uint exp)
        internal pure
        returns (uint)
    {
        require(base >= MIN_BPOW_BASE, "ERR_BPOW_BASE_TOO_LOW");
        require(base <= MAX_BPOW_BASE, "ERR_BPOW_BASE_TOO_HIGH");

        uint whole  = bfloor(exp);   
        uint remain = bsub(exp, whole);

        uint wholePow = bpowi(base, btoi(whole));

        if (remain == 0) {
            return wholePow;
        }

        uint partialResult = bpowApprox(base, remain, BPOW_PRECISION);
        return bmul(wholePow, partialResult);
    }

    function bpowApprox(uint base, uint exp, uint precision)
        internal pure
        returns (uint)
    {
        // term 0:
        uint a     = exp;
        (uint x, bool xneg)  = bsubSign(base, BONE);
        uint term = BONE;
        uint sum   = term;
        bool negative = false;


        // term(k) = numer / denom 
        //         = (product(a - i - 1, i=1-->k) * x^k) / (k!)
        // each iteration, multiply previous term by (a-(k-1)) * x / k
        // continue until term is less than precision
        for (uint i = 1; term >= precision; i++) {
            uint bigK = i * BONE;
            (uint c, bool cneg) = bsubSign(a, bsub(bigK, BONE));
            term = bmul(term, bmul(c, x));
            term = bdiv(term, bigK);
            if (term == 0) break;

            if (xneg) negative = !negative;
            if (cneg) negative = !negative;
            if (negative) {
                sum = bsub(sum, term);
            } else {
                sum = badd(sum, term);
            }
        }

        return sum;
    }

}

// File: contracts/balancer-core/BToken.sol

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.6.12;


// Highly opinionated token implementation

interface IERC20 {
    event Approval(address indexed src, address indexed dst, uint amt);
    event Transfer(address indexed src, address indexed dst, uint amt);

    function totalSupply() external view returns (uint);
    function balanceOf(address whom) external view returns (uint);
    function allowance(address src, address dst) external view returns (uint);

    function approve(address dst, uint amt) external returns (bool);
    function transfer(address dst, uint amt) external returns (bool);
    function transferFrom(
        address src, address dst, uint amt
    ) external returns (bool);
}

contract BTokenBase is BNum {

    mapping(address => uint)                   internal _balance;
    mapping(address => mapping(address=>uint)) internal _allowance;
    uint internal _totalSupply;

    event Approval(address indexed src, address indexed dst, uint amt);
    event Transfer(address indexed src, address indexed dst, uint amt);

    function _mint(uint amt) internal {
        _balance[address(this)] = badd(_balance[address(this)], amt);
        _totalSupply = badd(_totalSupply, amt);
        emit Transfer(address(0), address(this), amt);
    }

    function _burn(uint amt) internal {
        require(_balance[address(this)] >= amt, "ERR_INSUFFICIENT_BAL");
        _balance[address(this)] = bsub(_balance[address(this)], amt);
        _totalSupply = bsub(_totalSupply, amt);
        emit Transfer(address(this), address(0), amt);
    }

    function _move(address src, address dst, uint amt) internal {
        require(_balance[src] >= amt, "ERR_INSUFFICIENT_BAL");
        _balance[src] = bsub(_balance[src], amt);
        _balance[dst] = badd(_balance[dst], amt);
        emit Transfer(src, dst, amt);
    }

    function _push(address to, uint amt) internal {
        _move(address(this), to, amt);
    }

    function _pull(address from, uint amt) internal {
        _move(from, address(this), amt);
    }
}

contract BToken is BTokenBase, IERC20 {

    string  internal _name;
    string  internal _symbol;
    uint8   private _decimals = 18;

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns(uint8) {
        return _decimals;
    }

    function allowance(address src, address dst) external override view returns (uint) {
        return _allowance[src][dst];
    }

    function balanceOf(address whom) external override view returns (uint) {
        return _balance[whom];
    }

    function totalSupply() public override view returns (uint) {
        return _totalSupply;
    }

    function approve(address dst, uint amt) external override returns (bool) {
        _allowance[msg.sender][dst] = amt;
        emit Approval(msg.sender, dst, amt);
        return true;
    }

    function increaseApproval(address dst, uint amt) external returns (bool) {
        _allowance[msg.sender][dst] = badd(_allowance[msg.sender][dst], amt);
        emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);
        return true;
    }

    function decreaseApproval(address dst, uint amt) external returns (bool) {
        uint oldValue = _allowance[msg.sender][dst];
        if (amt > oldValue) {
            _allowance[msg.sender][dst] = 0;
        } else {
            _allowance[msg.sender][dst] = bsub(oldValue, amt);
        }
        emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);
        return true;
    }

    function transfer(address dst, uint amt) external override returns (bool) {
        _move(msg.sender, dst, amt);
        return true;
    }

    function transferFrom(address src, address dst, uint amt) external override returns (bool) {
        require(msg.sender == src || amt <= _allowance[src][msg.sender], "ERR_BTOKEN_BAD_CALLER");
        _move(src, dst, amt);
        if (msg.sender != src && _allowance[src][msg.sender] != uint256(-1)) {
            _allowance[src][msg.sender] = bsub(_allowance[src][msg.sender], amt);
            emit Approval(msg.sender, dst, _allowance[src][msg.sender]);
        }
        return true;
    }
}

// File: contracts/balancer-core/BMath.sol

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.6.12;


contract BMath is BConst, BNum {
    /**********************************************************************************************
    // calcSpotPrice                                                                             //
    // sP = spotPrice                                                                            //
    // bI = tokenBalanceIn                ( bI / wI )         1                                  //
    // bO = tokenBalanceOut         sP =  -----------  *  ----------                             //
    // wI = tokenWeightIn                 ( bO / wO )     ( 1 - sF )                             //
    // wO = tokenWeightOut                                                                       //
    // sF = swapFee                                                                              //
    **********************************************************************************************/
    function calcSpotPrice(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint swapFee
    )
        public pure
        returns (uint spotPrice)
    {
        uint numer = bdiv(tokenBalanceIn, tokenWeightIn);
        uint denom = bdiv(tokenBalanceOut, tokenWeightOut);
        uint ratio = bdiv(numer, denom);
        uint scale = bdiv(BONE, bsub(BONE, swapFee));
        return  (spotPrice = bmul(ratio, scale));
    }

    /**********************************************************************************************
    // calcOutGivenIn                                                                            //
    // aO = tokenAmountOut                                                                       //
    // bO = tokenBalanceOut                                                                      //
    // bI = tokenBalanceIn              /      /            bI             \    (wI / wO) \      //
    // aI = tokenAmountIn    aO = bO * |  1 - | --------------------------  | ^            |     //
    // wI = tokenWeightIn               \      \ ( bI + ( aI * ( 1 - sF )) /              /      //
    // wO = tokenWeightOut                                                                       //
    // sF = swapFee                                                                              //
    **********************************************************************************************/
    function calcOutGivenIn(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint tokenAmountIn,
        uint swapFee
    )
        public pure
        returns (uint tokenAmountOut)
    {
        uint weightRatio = bdiv(tokenWeightIn, tokenWeightOut);
        uint adjustedIn = bsub(BONE, swapFee);
        adjustedIn = bmul(tokenAmountIn, adjustedIn);
        uint y = bdiv(tokenBalanceIn, badd(tokenBalanceIn, adjustedIn));
        uint foo = bpow(y, weightRatio);
        uint bar = bsub(BONE, foo);
        tokenAmountOut = bmul(tokenBalanceOut, bar);
        return tokenAmountOut;
    }

    /**********************************************************************************************
    // calcInGivenOut                                                                            //
    // aI = tokenAmountIn                                                                        //
    // bO = tokenBalanceOut               /  /     bO      \    (wO / wI)      \                 //
    // bI = tokenBalanceIn          bI * |  | ------------  | ^            - 1  |                //
    // aO = tokenAmountOut    aI =        \  \ ( bO - aO ) /                   /                 //
    // wI = tokenWeightIn           --------------------------------------------                 //
    // wO = tokenWeightOut                          ( 1 - sF )                                   //
    // sF = swapFee                                                                              //
    **********************************************************************************************/
    function calcInGivenOut(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint tokenAmountOut,
        uint swapFee
    )
        public pure
        returns (uint tokenAmountIn)
    {
        uint weightRatio = bdiv(tokenWeightOut, tokenWeightIn);
        uint diff = bsub(tokenBalanceOut, tokenAmountOut);
        uint y = bdiv(tokenBalanceOut, diff);
        uint foo = bpow(y, weightRatio);
        foo = bsub(foo, BONE);
        tokenAmountIn = bsub(BONE, swapFee);
        tokenAmountIn = bdiv(bmul(tokenBalanceIn, foo), tokenAmountIn);
        return tokenAmountIn;
    }

    /**********************************************************************************************
    // calcPoolOutGivenSingleIn                                                                  //
    // pAo = poolAmountOut         /                                              \              //
    // tAi = tokenAmountIn        ///      /     //    wI \      \\       \     wI \             //
    // wI = tokenWeightIn        //| tAi *| 1 - || 1 - --  | * sF || + tBi \    --  \            //
    // tW = totalWeight     pAo=||  \      \     \\    tW /      //         | ^ tW   | * pS - pS //
    // tBi = tokenBalanceIn      \\  ------------------------------------- /        /            //
    // pS = poolSupply            \\                    tBi               /        /             //
    // sF = swapFee                \                                              /              //
    **********************************************************************************************/
    function calcPoolOutGivenSingleIn(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint poolSupply,
        uint totalWeight,
        uint tokenAmountIn,
        uint swapFee
    )
        public pure
        returns (uint poolAmountOut)
    {
        // Charge the trading fee for the proportion of tokenAi
        ///  which is implicitly traded to the other pool tokens.
        // That proportion is (1- weightTokenIn)
        // tokenAiAfterFee = tAi * (1 - (1-weightTi) * poolFee);
        uint normalizedWeight = bdiv(tokenWeightIn, totalWeight);
        uint zaz = bmul(bsub(BONE, normalizedWeight), swapFee); 
        uint tokenAmountInAfterFee = bmul(tokenAmountIn, bsub(BONE, zaz));

        uint newTokenBalanceIn = badd(tokenBalanceIn, tokenAmountInAfterFee);
        uint tokenInRatio = bdiv(newTokenBalanceIn, tokenBalanceIn);

        // uint newPoolSupply = (ratioTi ^ weightTi) * poolSupply;
        uint poolRatio = bpow(tokenInRatio, normalizedWeight);
        uint newPoolSupply = bmul(poolRatio, poolSupply);
        poolAmountOut = bsub(newPoolSupply, poolSupply);
        return poolAmountOut;
    }

    /**********************************************************************************************
    // calcSingleInGivenPoolOut                                                                  //
    // tAi = tokenAmountIn              //(pS + pAo)\     /    1    \\                           //
    // pS = poolSupply                 || ---------  | ^ | --------- || * bI - bI                //
    // pAo = poolAmountOut              \\    pS    /     \(wI / tW)//                           //
    // bI = balanceIn          tAi =  --------------------------------------------               //
    // wI = weightIn                              /      wI  \                                   //
    // tW = totalWeight                          |  1 - ----  |  * sF                            //
    // sF = swapFee                               \      tW  /                                   //
    **********************************************************************************************/
    function calcSingleInGivenPoolOut(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint poolSupply,
        uint totalWeight,
        uint poolAmountOut,
        uint swapFee
    )
        public pure
        returns (uint tokenAmountIn)
    {
        uint normalizedWeight = bdiv(tokenWeightIn, totalWeight);
        uint newPoolSupply = badd(poolSupply, poolAmountOut);
        uint poolRatio = bdiv(newPoolSupply, poolSupply);
      
        //uint newBalTi = poolRatio^(1/weightTi) * balTi;
        uint boo = bdiv(BONE, normalizedWeight); 
        uint tokenInRatio = bpow(poolRatio, boo);
        uint newTokenBalanceIn = bmul(tokenInRatio, tokenBalanceIn);
        uint tokenAmountInAfterFee = bsub(newTokenBalanceIn, tokenBalanceIn);
        // Do reverse order of fees charged in joinswap_ExternAmountIn, this way 
        //     ``` pAo == joinswap_ExternAmountIn(Ti, joinswap_PoolAmountOut(pAo, Ti)) ```
        //uint tAi = tAiAfterFee / (1 - (1-weightTi) * swapFee) ;
        uint zar = bmul(bsub(BONE, normalizedWeight), swapFee);
        tokenAmountIn = bdiv(tokenAmountInAfterFee, bsub(BONE, zar));
        return tokenAmountIn;
    }

    /**********************************************************************************************
    // calcSingleOutGivenPoolIn                                                                  //
    // tAo = tokenAmountOut            /      /                                             \\   //
    // bO = tokenBalanceOut           /      //       pS - pAi        \     /    1    \      \\  //
    // pAi = poolAmountIn            | bO - || ----------------------- | ^ | --------- | * b0 || //
    // ps = poolSupply                \      \\          pS           /     \(wO / tW)/      //  //
    // wI = tokenWeightIn      tAo =   \      \                                             //   //
    // tW = totalWeight                    /     /      wO \       \                             //
    // sF = swapFee                    *  | 1 - |  1 - ---- | * sF  |                            //
    // eF = exitFee                        \     \      tW /       /                             //
    **********************************************************************************************/
    function calcSingleOutGivenPoolIn(
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint poolSupply,
        uint totalWeight,
        uint poolAmountIn,
        uint swapFee
    )
        public pure
        returns (uint tokenAmountOut)
    {
        uint normalizedWeight = bdiv(tokenWeightOut, totalWeight);
        uint newPoolSupply = bsub(poolSupply, poolAmountIn);
        uint poolRatio = bdiv(newPoolSupply, poolSupply);
     
        // newBalTo = poolRatio^(1/weightTo) * balTo;
        uint tokenOutRatio = bpow(poolRatio, bdiv(BONE, normalizedWeight));
        uint newTokenBalanceOut = bmul(tokenOutRatio, tokenBalanceOut);

        uint tokenAmountOutBeforeSwapFee = bsub(tokenBalanceOut, newTokenBalanceOut);

        // charge swap fee on the output token side 
        //uint tAo = tAoBeforeSwapFee * (1 - (1-weightTo) * swapFee)
        uint zaz = bmul(bsub(BONE, normalizedWeight), swapFee); 
        tokenAmountOut = bmul(tokenAmountOutBeforeSwapFee, bsub(BONE, zaz));
        return tokenAmountOut;
    }

    /**********************************************************************************************
    // calcPoolInGivenSingleOut                                                                  //
    // pAi = poolAmountIn               // /               tAo             \\     / wO \     \   //
    // bO = tokenBalanceOut            // | bO - -------------------------- |\   | ---- |     \  //
    // tAo = tokenAmountOut      pS - ||   \     1 - ((1 - (tO / tW)) * sF)/  | ^ \ tW /  * pS | //
    // ps = poolSupply                 \\ -----------------------------------/                /  //
    // wO = tokenWeightOut  pAi =       \\               bO                 /                /   //
    // tW = totalWeight                                                                          //
    // sF = swapFee                                                                              //
    **********************************************************************************************/
    function calcPoolInGivenSingleOut(
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint poolSupply,
        uint totalWeight,
        uint tokenAmountOut,
        uint swapFee
    )
        public pure
        returns (uint poolAmountIn)
    {

        // charge swap fee on the output token side 
        uint normalizedWeight = bdiv(tokenWeightOut, totalWeight);
        //uint tAoBeforeSwapFee = tAo / (1 - (1-weightTo) * swapFee) ;
        uint zoo = bsub(BONE, normalizedWeight);
        uint zar = bmul(zoo, swapFee); 
        uint tokenAmountOutBeforeSwapFee = bdiv(tokenAmountOut, bsub(BONE, zar));

        uint newTokenBalanceOut = bsub(tokenBalanceOut, tokenAmountOutBeforeSwapFee);
        uint tokenOutRatio = bdiv(newTokenBalanceOut, tokenBalanceOut);

        //uint newPoolSupply = (ratioTo ^ weightTo) * poolSupply;
        uint poolRatio = bpow(tokenOutRatio, normalizedWeight);
        uint newPoolSupply = bmul(poolRatio, poolSupply);
        uint poolAmountIn = bsub(poolSupply, newPoolSupply);
        return poolAmountIn;
    }
}

// File: contracts/IPoolRestrictions.sol

pragma solidity 0.6.12;


interface IPoolRestrictions {
    function getMaxTotalSupply(address _pool) external virtual view returns(uint256);
    function isVotingSignatureAllowed(address _votingAddress, bytes4 _signature) external virtual view returns(bool);
    function isWithoutFee(address _addr) external virtual view returns(bool);
}

// File: contracts/balancer-core/BPool.sol

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.6.12;




contract BPool is BToken, BMath {

    struct Record {
        bool bound;   // is token bound to pool
        uint index;   // private
        uint denorm;  // denormalized weight
        uint balance;
    }

    event LOG_SWAP(
        address indexed caller,
        address indexed tokenIn,
        address indexed tokenOut,
        uint256         tokenAmountIn,
        uint256         tokenAmountOut
    );

    event LOG_JOIN(
        address indexed caller,
        address indexed tokenIn,
        uint256         tokenAmountIn
    );

    event LOG_EXIT(
        address indexed caller,
        address indexed tokenOut,
        uint256         tokenAmountOut
    );

    event LOG_CALL(
        bytes4  indexed sig,
        address indexed caller,
        bytes           data
    ) anonymous;

    event LOG_CALL_VOTING(
        address indexed voting,
        bool    indexed success,
        bytes4  indexed inputSig,
        bytes           inputData,
        bytes           outputData
    );

    modifier _logs_() {
        emit LOG_CALL(msg.sig, msg.sender, msg.data);
        _;
    }

    modifier _lock_() {
        require(!_mutex, "REENTRY");
        _mutex = true;
        _;
        _mutex = false;
    }

    modifier _viewlock_() {
        require(!_mutex, "REENTRY");
        _;
    }

    bool private _mutex;

    address private _controller; // has CONTROL role
    bool private _publicSwap; // true if PUBLIC can call SWAP functions

    IPoolRestrictions private _restrictions;

    // `setSwapFee` and `finalize` require CONTROL
    // `finalize` sets `PUBLIC can SWAP`, `PUBLIC can JOIN`
    uint private _swapFee;
    uint private _communitySwapFee;
    uint private _communityJoinFee;
    uint private _communityExitFee;
    address private _communityFeeReceiver;
    bool private _finalized;

    address[] private _tokens;
    mapping(address=>Record) private  _records;
    uint private _totalWeight;

    constructor(string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _controller = msg.sender;
        _swapFee = MIN_FEE;
        _communitySwapFee = 0;
        _communityJoinFee = 0;
        _communityExitFee = 0;
        _publicSwap = false;
        _finalized = false;
    }

    function isPublicSwap()
        external view
        returns (bool)
    {
        return _publicSwap;
    }

    function isFinalized()
        external view
        returns (bool)
    {
        return _finalized;
    }

    function isBound(address t)
        external view
        returns (bool)
    {
        return _records[t].bound;
    }

    function getNumTokens()
        external view
        returns (uint) 
    {
        return _tokens.length;
    }

    function getCurrentTokens()
        external view _viewlock_
        returns (address[] memory tokens)
    {
        return _tokens;
    }

    function getFinalTokens()
        external view
        _viewlock_
        returns (address[] memory tokens)
    {
        require(_finalized, "NOT_FINALIZED");
        return _tokens;
    }

    function getDenormalizedWeight(address token)
        external view
        _viewlock_
        returns (uint)
    {

        _checkBound(token);
        return _records[token].denorm;
    }

    function getTotalDenormalizedWeight()
        external view
        _viewlock_
        returns (uint)
    {
        return _totalWeight;
    }

    function getNormalizedWeight(address token)
        external view
        _viewlock_
        returns (uint)
    {

        _checkBound(token);
        return bdiv(_records[token].denorm, _totalWeight);
    }

    function getBalance(address token)
        external view
        _viewlock_
        returns (uint)
    {

        _checkBound(token);
        return _records[token].balance;
    }

    function getSwapFee()
        external view
        _viewlock_
        returns (uint)
    {
        return _swapFee;
    }

    function getCommunityFee()
        external view
        _viewlock_
        returns (uint communitySwapFee, uint communityJoinFee, uint communityExitFee, address communityFeeReceiver)
    {
        return (_communitySwapFee, _communityJoinFee, _communityExitFee, _communityFeeReceiver);
    }

    function getController()
        external view
        _viewlock_
        returns (address)
    {
        return _controller;
    }

    function getRestrictions()
        external view
        _viewlock_
        returns (address)
    {
        return address(_restrictions);
    }

    function setSwapFee(uint swapFee)
        external
        _logs_
        _lock_
    {
        _checkController();
        require(swapFee >= MIN_FEE && swapFee <= MAX_FEE, "FEE_BOUNDS");
        _swapFee = swapFee;
    }

    function setCommunityFeeAndReceiver(
        uint communitySwapFee,
        uint communityJoinFee,
        uint communityExitFee,
        address communityFeeReceiver
    )
        external
        _logs_
        _lock_
    {
        _checkController();
        require(communitySwapFee >= MIN_FEE && communitySwapFee <= MAX_FEE, "FEE_BOUNDS");
        require(communityJoinFee >= MIN_FEE && communityJoinFee <= MAX_FEE, "FEE_BOUNDS");
        require(communityExitFee >= MIN_FEE && communityExitFee <= MAX_FEE, "FEE_BOUNDS");
        _communitySwapFee = communitySwapFee;
        _communityJoinFee = communityJoinFee;
        _communityExitFee = communityExitFee;
        _communityFeeReceiver = communityFeeReceiver;
    }

    function setRestrictions(IPoolRestrictions restrictions)
        external
        _logs_
        _lock_
    {
        _checkController();
        _restrictions = restrictions;
    }

    function setController(address manager)
        external
        _logs_
        _lock_
    {
        _checkController();
        _controller = manager;
    }

    function setPublicSwap(bool public_)
        external
        _logs_
        _lock_
    {
        _checkFinalized();
        _checkController();
        _publicSwap = public_;
    }

    function finalize()
        external
        _logs_
        _lock_
    {
        _checkController();
        _checkFinalized();
        require(_tokens.length >= MIN_BOUND_TOKENS, "MIN_TOKENS");

        _finalized = true;
        _publicSwap = true;

        _mintPoolShare(INIT_POOL_SUPPLY);
        _pushPoolShare(msg.sender, INIT_POOL_SUPPLY);
    }

    function callVoting(address voting, bytes4 signature, bytes calldata args, uint value)
        external
        _logs_
        _lock_
    {
        require(_restrictions.isVotingSignatureAllowed(voting, signature), "NOT_ALLOWED_SIG");
        _checkController();

        (bool success, bytes memory data) = voting.call{ value: value }(abi.encodePacked(signature, args));
        require(success, "NOT_SUCCESS");
        emit LOG_CALL_VOTING(voting, success, signature, msg.data, data);
    }

    function bind(address token, uint balance, uint denorm)
        external
        _logs_
        // _lock_  Bind does not lock because it jumps to `rebind`, which does
    {
        _checkController();
        require(!_records[token].bound, "IS_BOUND");
        _checkFinalized();

        require(_tokens.length < MAX_BOUND_TOKENS, "MAX_TOKENS");

        _records[token] = Record({
            bound: true,
            index: _tokens.length,
            denorm: 0,    // balance and denorm will be validated
            balance: 0   // and set by `rebind`
        });
        _tokens.push(token);
        rebind(token, balance, denorm);
    }

    function rebind(address token, uint balance, uint denorm)
        public
        _logs_
        _lock_
    {

        _checkController();
        _checkBound(token);
        _checkFinalized();

        require(denorm >= MIN_WEIGHT && denorm <= MAX_WEIGHT, "WEIGHT_BOUNDS");
        require(balance >= MIN_BALANCE, "MIN_BALANCE");

        // Adjust the denorm and totalWeight
        uint oldWeight = _records[token].denorm;
        if (denorm > oldWeight) {
            _totalWeight = badd(_totalWeight, bsub(denorm, oldWeight));
            require(_totalWeight <= MAX_TOTAL_WEIGHT, "MAX_TOTAL_WEIGHT");
        } else if (denorm < oldWeight) {
            _totalWeight = bsub(_totalWeight, bsub(oldWeight, denorm));
        }        
        _records[token].denorm = denorm;

        // Adjust the balance record and actual token balance
        uint oldBalance = _records[token].balance;
        _records[token].balance = balance;
        if (balance > oldBalance) {
            _pullUnderlying(token, msg.sender, bsub(balance, oldBalance));
        } else if (balance < oldBalance) {
            uint tokenBalanceWithdrawn = bsub(oldBalance, balance);
            _pushUnderlying(token, msg.sender, tokenBalanceWithdrawn);
        }
    }

    function unbind(address token)
        external
        _logs_
        _lock_
    {

        _checkController();
        _checkBound(token);
        _checkFinalized();

        uint tokenBalance = _records[token].balance;

        _totalWeight = bsub(_totalWeight, _records[token].denorm);

        // Swap the token-to-unbind with the last token,
        // then delete the last token
        uint index = _records[token].index;
        uint last = _tokens.length - 1;
        _tokens[index] = _tokens[last];
        _records[_tokens[index]].index = index;
        _tokens.pop();
        _records[token] = Record({
            bound: false,
            index: 0,
            denorm: 0,
            balance: 0
        });

        _pushUnderlying(token, msg.sender, tokenBalance);
    }

    // Absorb any tokens that have been sent to this contract into the pool
    function gulp(address token)
        external
        _logs_
        _lock_
    {
        _checkBound(token);
        _records[token].balance = IERC20(token).balanceOf(address(this));
    }

    function getSpotPrice(address tokenIn, address tokenOut)
        external view
        _viewlock_
        returns (uint spotPrice)
    {
        require(_records[tokenIn].bound && _records[tokenOut].bound, "NOT_BOUND");
        Record storage inRecord = _records[tokenIn];
        Record storage outRecord = _records[tokenOut];
        return calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, _swapFee);
    }

    function getSpotPriceSansFee(address tokenIn, address tokenOut)
        external view
        _viewlock_
        returns (uint spotPrice)
    {
        _checkBound(tokenIn);
        _checkBound(tokenOut);
        Record storage inRecord = _records[tokenIn];
        Record storage outRecord = _records[tokenOut];
        return calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, 0);
    }

    function joinPool(uint poolAmountOut, uint[] calldata maxAmountsIn)
        external
        _logs_
        _lock_
    {
        require(_finalized, "NOT_FINALIZED");

        uint poolTotal = totalSupply();
        uint ratio = bdiv(poolAmountOut, poolTotal);
        require(ratio != 0, "MATH_APPROX");

        for (uint i = 0; i < _tokens.length; i++) {
            address t = _tokens[i];
            uint bal = _records[t].balance;
            uint tokenAmountIn = bmul(ratio, bal);
            require(tokenAmountIn != 0, "MATH_APPROX");
            require(tokenAmountIn <= maxAmountsIn[i], "LIMIT_IN");
            _records[t].balance = badd(_records[t].balance, tokenAmountIn);
            emit LOG_JOIN(msg.sender, t, tokenAmountIn);
            _pullUnderlying(t, msg.sender, tokenAmountIn);
        }

        (uint poolAmountOutAfterFee, uint poolAmountOutFee) = calcAmountWithCommunityFee(
            poolAmountOut,
            _communityJoinFee,
            msg.sender
        );

        _mintPoolShare(poolAmountOut);
        _pushPoolShare(msg.sender, poolAmountOutAfterFee);
        _pushPoolShare(_communityFeeReceiver, poolAmountOutFee);
    }

    function exitPool(uint poolAmountIn, uint[] calldata minAmountsOut)
        external
        _logs_
        _lock_
    {
        require(_finalized, "NOT_FINALIZED");

        (uint poolAmountInAfterFee, uint poolAmountInFee) = calcAmountWithCommunityFee(
            poolAmountIn,
            _communityExitFee,
            msg.sender
        );

        uint poolTotal = totalSupply();
        uint ratio = bdiv(poolAmountInAfterFee, poolTotal);
        require(ratio != 0, "MATH_APPROX");

        _pullPoolShare(msg.sender, poolAmountIn);
        _pushPoolShare(_communityFeeReceiver, poolAmountInFee);
        _burnPoolShare(poolAmountInAfterFee);

        for (uint i = 0; i < _tokens.length; i++) {
            address t = _tokens[i];
            uint bal = _records[t].balance;
            uint tokenAmountOut = bmul(ratio, bal);
            require(tokenAmountOut != 0, "MATH_APPROX");
            require(tokenAmountOut >= minAmountsOut[i], "LIMIT_OUT");
            _records[t].balance = bsub(_records[t].balance, tokenAmountOut);
            emit LOG_EXIT(msg.sender, t, tokenAmountOut);
            _pushUnderlying(t, msg.sender, tokenAmountOut);
        }

    }


    function swapExactAmountIn(
        address tokenIn,
        uint tokenAmountIn,
        address tokenOut,
        uint minAmountOut,
        uint maxPrice
    )
        external
        _logs_
        _lock_
        returns (uint tokenAmountOut, uint spotPriceAfter)
    {
        _checkBound(tokenIn);
        _checkBound(tokenOut);
        require(_publicSwap, "NOT_PUBLIC");

        Record storage inRecord = _records[address(tokenIn)];
        Record storage outRecord = _records[address(tokenOut)];

        uint spotPriceBefore = calcSpotPrice(
                                    inRecord.balance,
                                    inRecord.denorm,
                                    outRecord.balance,
                                    outRecord.denorm,
                                    _swapFee
                                );
        require(spotPriceBefore <= maxPrice, "LIMIT_PRICE");

        (uint tokenAmountInAfterFee, uint tokenAmountInFee) = calcAmountWithCommunityFee(
                                                                tokenAmountIn,
                                                                _communitySwapFee,
                                                                msg.sender
                                                            );

        require(tokenAmountInAfterFee <= bmul(inRecord.balance, MAX_IN_RATIO), "MAX_IN_RATIO");

        tokenAmountOut = calcOutGivenIn(
                            inRecord.balance,
                            inRecord.denorm,
                            outRecord.balance,
                            outRecord.denorm,
                            tokenAmountInAfterFee,
                            _swapFee
                        );
        require(tokenAmountOut >= minAmountOut, "LIMIT_OUT");

        inRecord.balance = badd(inRecord.balance, tokenAmountInAfterFee);
        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);

        spotPriceAfter = calcSpotPrice(
                                inRecord.balance,
                                inRecord.denorm,
                                outRecord.balance,
                                outRecord.denorm,
                                _swapFee
                            );
        require(
            spotPriceAfter >= spotPriceBefore &&
            spotPriceBefore <= bdiv(tokenAmountInAfterFee, tokenAmountOut),
            "MATH_APPROX"
        );
        require(spotPriceAfter <= maxPrice, "LIMIT_PRICE");

        emit LOG_SWAP(msg.sender, tokenIn, tokenOut, tokenAmountInAfterFee, tokenAmountOut);

        _pullCommunityFeeUnderlying(tokenIn, msg.sender, tokenAmountInFee);
        _pullUnderlying(tokenIn, msg.sender, tokenAmountInAfterFee);
        _pushUnderlying(tokenOut, msg.sender, tokenAmountOut);

        return (tokenAmountOut, spotPriceAfter);
    }

    function swapExactAmountOut(
        address tokenIn,
        uint maxAmountIn,
        address tokenOut,
        uint tokenAmountOut,
        uint maxPrice
    )
        external
        _logs_
        _lock_ 
        returns (uint tokenAmountIn, uint spotPriceAfter)
    {
        _checkBound(tokenIn);
        _checkBound(tokenOut);
        require(_publicSwap, "NOT_PUBLIC");

        Record storage inRecord = _records[address(tokenIn)];
        Record storage outRecord = _records[address(tokenOut)];

        require(tokenAmountOut <= bmul(outRecord.balance, MAX_OUT_RATIO), "OUT_RATIO");

        uint spotPriceBefore = calcSpotPrice(
                                    inRecord.balance,
                                    inRecord.denorm,
                                    outRecord.balance,
                                    outRecord.denorm,
                                    _swapFee
                                );
        require(spotPriceBefore <= maxPrice, "LIMIT_PRICE");

        (uint tokenAmountOutAfterFee, uint tokenAmountOutFee) = calcAmountWithCommunityFee(
            tokenAmountOut,
            _communitySwapFee,
            msg.sender
        );

        tokenAmountIn = calcInGivenOut(
                            inRecord.balance,
                            inRecord.denorm,
                            outRecord.balance,
                            outRecord.denorm,
                            tokenAmountOut,
                            _swapFee
                        );
        require(tokenAmountIn <= maxAmountIn, "LIMIT_IN");

        inRecord.balance = badd(inRecord.balance, tokenAmountIn);
        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);

        spotPriceAfter = calcSpotPrice(
                                inRecord.balance,
                                inRecord.denorm,
                                outRecord.balance,
                                outRecord.denorm,
                                _swapFee
                            );
        require(
            spotPriceAfter >= spotPriceBefore &&
            spotPriceBefore <= bdiv(tokenAmountIn, tokenAmountOutAfterFee),
            "MATH_APPROX"
        );
        require(spotPriceAfter <= maxPrice, "LIMIT_PRICE");

        emit LOG_SWAP(msg.sender, tokenIn, tokenOut, tokenAmountIn, tokenAmountOutAfterFee);

        _pullUnderlying(tokenIn, msg.sender, tokenAmountIn);
        _pushUnderlying(tokenOut, msg.sender, tokenAmountOutAfterFee);
        _pushUnderlying(tokenOut, _communityFeeReceiver, tokenAmountOutFee);

        return (tokenAmountIn, spotPriceAfter);
    }


    function joinswapExternAmountIn(address tokenIn, uint tokenAmountIn, uint minPoolAmountOut)
        external
        _logs_
        _lock_
        returns (uint poolAmountOut)

    {        
        require(_finalized, "NOT_FINALIZED");
        _checkBound(tokenIn);
        require(tokenAmountIn <= bmul(_records[tokenIn].balance, MAX_IN_RATIO), "MAX_IN_RATIO");

        (uint tokenAmountInAfterFee, uint tokenAmountInFee) = calcAmountWithCommunityFee(
            tokenAmountIn,
            _communityJoinFee,
            msg.sender
        );

        Record storage inRecord = _records[tokenIn];

        poolAmountOut = calcPoolOutGivenSingleIn(
                            inRecord.balance,
                            inRecord.denorm,
                            _totalSupply,
                            _totalWeight,
                            tokenAmountInAfterFee,
                            _swapFee
                        );

        require(poolAmountOut >= minPoolAmountOut, "LIMIT_OUT");

        inRecord.balance = badd(inRecord.balance, tokenAmountInAfterFee);

        emit LOG_JOIN(msg.sender, tokenIn, tokenAmountInAfterFee);

        _mintPoolShare(poolAmountOut);
        _pushPoolShare(msg.sender, poolAmountOut);
        _pullCommunityFeeUnderlying(tokenIn, msg.sender, tokenAmountInFee);
        _pullUnderlying(tokenIn, msg.sender, tokenAmountInAfterFee);

        return poolAmountOut;
    }

    function joinswapPoolAmountOut(address tokenIn, uint poolAmountOut, uint maxAmountIn)
        external
        _logs_
        _lock_
        returns (uint tokenAmountIn)
    {
        require(_finalized, "NOT_FINALIZED");
        _checkBound(tokenIn);

        Record storage inRecord = _records[tokenIn];

        (uint poolAmountOutAfterFee, uint poolAmountOutFee) = calcAmountWithCommunityFee(
            poolAmountOut,
            _communityJoinFee,
            msg.sender
        );

        tokenAmountIn = calcSingleInGivenPoolOut(
                            inRecord.balance,
                            inRecord.denorm,
                            _totalSupply,
                            _totalWeight,
                            poolAmountOut,
                            _swapFee
                        );

        require(tokenAmountIn != 0, "MATH_APPROX");
        require(tokenAmountIn <= maxAmountIn, "LIMIT_IN");

        require(tokenAmountIn <= bmul(_records[tokenIn].balance, MAX_IN_RATIO), "MAX_IN_RATIO");

        inRecord.balance = badd(inRecord.balance, tokenAmountIn);

        emit LOG_JOIN(msg.sender, tokenIn, tokenAmountIn);

        _mintPoolShare(poolAmountOut);
        _pushPoolShare(msg.sender, poolAmountOutAfterFee);
        _pushPoolShare(_communityFeeReceiver, poolAmountOutFee);
        _pullUnderlying(tokenIn, msg.sender, tokenAmountIn);

        return tokenAmountIn;
    }

    function exitswapPoolAmountIn(address tokenOut, uint poolAmountIn, uint minAmountOut)
        external
        _logs_
        _lock_
        returns (uint tokenAmountOut)
    {
        require(_finalized, "NOT_FINALIZED");
        _checkBound(tokenOut);

        Record storage outRecord = _records[tokenOut];

        tokenAmountOut = calcSingleOutGivenPoolIn(
                            outRecord.balance,
                            outRecord.denorm,
                            _totalSupply,
                            _totalWeight,
                            poolAmountIn,
                            _swapFee
                        );

        require(tokenAmountOut >= minAmountOut, "LIMIT_OUT");
        
        require(tokenAmountOut <= bmul(_records[tokenOut].balance, MAX_OUT_RATIO), "OUT_RATIO");

        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);

        (uint tokenAmountOutAfterFee, uint tokenAmountOutFee) = calcAmountWithCommunityFee(
            tokenAmountOut,
            _communityExitFee,
            msg.sender
        );

        emit LOG_EXIT(msg.sender, tokenOut, tokenAmountOutAfterFee);

        _pullPoolShare(msg.sender, poolAmountIn);
        _burnPoolShare(poolAmountIn);
        _pushUnderlying(tokenOut, msg.sender, tokenAmountOutAfterFee);
        _pushUnderlying(tokenOut, _communityFeeReceiver, tokenAmountOutFee);

        return tokenAmountOut;
    }

    function exitswapExternAmountOut(address tokenOut, uint tokenAmountOut, uint maxPoolAmountIn)
        external
        _logs_
        _lock_
        returns (uint poolAmountIn)
    {
        require(_finalized, "NOT_FINALIZED");
        _checkBound(tokenOut);
        require(tokenAmountOut <= bmul(_records[tokenOut].balance, MAX_OUT_RATIO), "OUT_RATIO");

        Record storage outRecord = _records[tokenOut];

        (uint tokenAmountOutAfterFee, uint tokenAmountOutFee) = calcAmountWithCommunityFee(
            tokenAmountOut,
            _communityExitFee,
            msg.sender
        );

        poolAmountIn = calcPoolInGivenSingleOut(
                            outRecord.balance,
                            outRecord.denorm,
                            _totalSupply,
                            _totalWeight,
                            tokenAmountOut,
                            _swapFee
                        );

        require(poolAmountIn != 0, "MATH_APPROX");
        require(poolAmountIn <= maxPoolAmountIn, "LIMIT_IN");

        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);

        emit LOG_EXIT(msg.sender, tokenOut, tokenAmountOutAfterFee);

        _pullPoolShare(msg.sender, poolAmountIn);
        _burnPoolShare(poolAmountIn);
        _pushUnderlying(tokenOut, msg.sender, tokenAmountOutAfterFee);
        _pushUnderlying(tokenOut, _communityFeeReceiver, tokenAmountOutFee);

        return poolAmountIn;
    }


    // ==
    // 'Underlying' token-manipulation functions make external calls but are NOT locked
    // You must `_lock_` or otherwise ensure reentry-safety

    function _pullUnderlying(address erc20, address from, uint amount)
        internal
    {
        bool xfer = IERC20(erc20).transferFrom(from, address(this), amount);
        require(xfer, "ERC20_FALSE");
    }

    function _pushUnderlying(address erc20, address to, uint amount)
        internal
    {
        bool xfer = IERC20(erc20).transfer(to, amount);
        require(xfer, "ERC20_FALSE");
    }

    function _pullCommunityFeeUnderlying(address erc20, address from, uint amount)
        internal
    {
        bool xfer = IERC20(erc20).transferFrom(from, _communityFeeReceiver, amount);
        require(xfer, "ERC20_FALSE");
    }

    function _pullPoolShare(address from, uint amount)
        internal
    {
        _pull(from, amount);
    }

    function _pushPoolShare(address to, uint amount)
        internal
    {
        _push(to, amount);
    }

    function _mintPoolShare(uint amount)
        internal
    {
        if(address(_restrictions) != address(0)) {
            uint maxTotalSupply = _restrictions.getMaxTotalSupply(address(this));
            require(badd(_totalSupply, amount) <= maxTotalSupply, "MAX_SUPPLY");
        }
        _mint(amount);
    }

    function _burnPoolShare(uint amount)
        internal
    {
        _burn(amount);
    }

    function _checkBound(address token)
        internal view
    {
        require(_records[token].bound, "NOT_BOUND");
    }

    function _checkController()
        internal view
    {
        require(msg.sender == _controller, "NOT_CONTROLLER");
    }

    function _checkFinalized()
        internal view
    {
        require(!_finalized, "IS_FINALIZED");
    }

    function calcAmountWithCommunityFee(
        uint tokenAmountIn,
        uint communityFee,
        address operator
    )
        public view
        returns (uint tokenAmountInAfterFee, uint tokenAmountFee)
    {
        if (address(_restrictions) != address(0) && _restrictions.isWithoutFee(operator)) {
            return (tokenAmountIn, 0);
        }
        uint adjustedIn = bsub(BONE, communityFee);
        tokenAmountInAfterFee = bmul(tokenAmountIn, adjustedIn);
        uint tokenAmountFee = bsub(tokenAmountIn, tokenAmountInAfterFee);
        return (tokenAmountInAfterFee, tokenAmountFee);
    }
}

{
  "compilationTarget": {
    "BPool.sol": "BPool"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 0
  },
  "remappings": []
}