interface IXPool {
    // XPToken
    event Approval(address indexed src, address indexed dst, uint256 amt);
    event Transfer(address indexed src, address indexed dst, uint256 amt);

    function totalSupply() external view returns (uint256);

    function balanceOf(address whom) external view returns (uint256);

    function allowance(address src, address dst)
        external
        view
        returns (uint256);

    function approve(address dst, uint256 amt) external returns (bool);

    function transfer(address dst, uint256 amt) external returns (bool);

    function transferFrom(
        address src,
        address dst,
        uint256 amt
    ) external returns (bool);

    // Swap
    function swapExactAmountIn(
        address tokenIn,
        uint256 tokenAmountIn,
        address tokenOut,
        uint256 minAmountOut,
        uint256 maxPrice
    ) external returns (uint256 tokenAmountOut, uint256 spotPriceAfter);

    function swapExactAmountOut(
        address tokenIn,
        uint256 maxAmountIn,
        address tokenOut,
        uint256 tokenAmountOut,
        uint256 maxPrice
    ) external returns (uint256 tokenAmountIn, uint256 spotPriceAfter);

    // Referral
    function swapExactAmountInRefer(
        address tokenIn,
        uint256 tokenAmountIn,
        address tokenOut,
        uint256 minAmountOut,
        uint256 maxPrice,
        address referrer
    ) external returns (uint256 tokenAmountOut, uint256 spotPriceAfter);

    function swapExactAmountOutRefer(
        address tokenIn,
        uint256 maxAmountIn,
        address tokenOut,
        uint256 tokenAmountOut,
        uint256 maxPrice,
        address referrer
    ) external returns (uint256 tokenAmountIn, uint256 spotPriceAfter);

    // Pool Data
    function isBound(address token) external view returns (bool);

    function getFinalTokens() external view returns (address[] memory tokens);

    function getBalance(address token) external view returns (uint256);

    function swapFee() external view returns (uint256);

    function exitFee() external view returns (uint256);

    function finalized() external view returns (uint256);

    function controller() external view returns (uint256);

    function xconfig() external view returns (uint256);

    function getDenormalizedWeight(address) external view returns (uint256);

    function getTotalDenormalizedWeight() external view returns (uint256);

    function getVersion() external view returns (bytes32);

    function calcInGivenOut(
        uint256 tokenBalanceIn,
        uint256 tokenWeightIn,
        uint256 tokenBalanceOut,
        uint256 tokenWeightOut,
        uint256 tokenAmountOut,
        uint256 _swapFee
    ) external pure returns (uint256 tokenAmountIn);

    function calcOutGivenIn(
        uint256 tokenBalanceIn,
        uint256 tokenWeightIn,
        uint256 tokenBalanceOut,
        uint256 tokenWeightOut,
        uint256 tokenAmountIn,
        uint256 _swapFee
    ) external pure returns (uint256 tokenAmountOut);

    // Pool Managment
    function setController(address _controller) external;

    function setExitFee(uint256 newFee) external;

    function finalize(uint256 _swapFee) external;

    function bind(address token, uint256 denorm) external;

    function joinPool(uint256 poolAmountOut, uint256[] calldata maxAmountsIn)
        external;

    function exitPool(uint256 poolAmountIn, uint256[] calldata minAmountsOut)
        external;

    function joinswapExternAmountIn(
        address tokenIn,
        uint256 tokenAmountIn,
        uint256 minPoolAmountOut
    ) external returns (uint256 poolAmountOut);

    function exitswapPoolAmountIn(
        address tokenOut,
        uint256 poolAmountIn,
        uint256 minAmountOut
    ) external returns (uint256 tokenAmountOut);

    // Pool Governance
    function updateSafu(address safu, uint256 fee) external;

    function updateFarm(bool isFarm) external;
}
function isBound(address token) external view returns (bool);

// Pool Data