// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IBPool {

    function isPublicSwap() external view returns (bool);

    function isFinalized() external view returns (bool);

    function isBound(address t) external view returns (bool);

    function getNumTokens() external view returns (uint);

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

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

    function getDenormalizedWeight(address token) external view returns (uint);

    function getTotalDenormalizedWeight() external view returns (uint);

    function getNormalizedWeight(address token) external view returns (uint);

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

    function getSwapFee() external view returns (uint);

    function getController() external view returns (address);

    function setSwapFee(uint swapFee) external;

    function setController(address manager) external;

    function setPublicSwap(bool public_) external;

    function finalize() external;

    function bind(address token, uint balance, uint denorm) external;

    function rebind(address token, uint balance, uint denorm) external;

    function unbind(address token) external;

    function gulp(address token) external;

    function getSpotPrice(address tokenIn, address tokenOut) external view returns (uint spotPrice);

    function getSpotPriceSansFee(address tokenIn, address tokenOut) external view returns (uint spotPrice);

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

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

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

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

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

    function joinswapPoolAmountOut(
        address tokenIn,
        uint poolAmountOut,
        uint maxAmountIn
    ) external returns (uint tokenAmountIn);

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

    function exitswapExternAmountOut(
        address tokenOut,
        uint tokenAmountOut,
        uint maxPoolAmountIn
    ) external returns (uint poolAmountIn);

    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);

    function calcSpotPrice(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint swapFee
    ) external returns (uint spotPrice);

    function calcOutGivenIn(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint tokenAmountIn,
        uint swapFee
    ) external returns (uint tokenAmountOut);

    function calcInGivenOut(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint tokenAmountOut,
        uint swapFee
    ) external returns (uint tokenAmountIn);

    function calcPoolOutGivenSingleIn(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint poolSupply,
        uint totalWeight,
        uint tokenAmountIn,
        uint swapFee
    ) external returns (uint poolAmountOut);

    function calcSingleInGivenPoolOut(
        uint tokenBalanceIn,
        uint tokenWeightIn,
        uint poolSupply,
        uint totalWeight,
        uint poolAmountOut,
        uint swapFee
    ) external returns (uint tokenAmountIn);

    function calcSingleOutGivenPoolIn(
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint poolSupply,
        uint totalWeight,
        uint poolAmountIn,
        uint swapFee
    ) external returns (uint tokenAmountOut);

    function calcPoolInGivenSingleOut(
        uint tokenBalanceOut,
        uint tokenWeightOut,
        uint poolSupply,
        uint totalWeight,
        uint tokenAmountOut,
        uint swapFee
    ) external returns (uint poolAmountIn);

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

interface IDvd is IERC20 {

    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;

    function increaseShareholderPoint(address account, uint256 amount) external;

    function decreaseShareholderPoint(address account, uint256 amount) external;

    function shareholderPointOf(address account) external view returns (uint256);

    function totalShareholderPoint() external view returns (uint256);

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IERC20Snapshot {

    function balanceOfAt(address account, uint256 snapshotId) external view returns (uint256);

    function totalSupplyAt(uint256 snapshotId) external view returns (uint256);

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { MassetStructs } from "./MassetStructs.sol";

///
/// @title IMasset
/// @dev   (Internal) Interface for interacting with Masset
///       VERSION: 1.0
///       DATE:    2020-05-05

interface IMasset is MassetStructs {

    /// @dev Calc interest
    function collectInterest() external returns (uint256 massetMinted, uint256 newTotalSupply);

    /// @dev Minting
    function mint(address _basset, uint256 _bassetQuantity)
        external returns (uint256 massetMinted);
    function mintTo(address _basset, uint256 _bassetQuantity, address _recipient)
        external returns (uint256 massetMinted);
    function mintMulti(address[] calldata _bAssets, uint256[] calldata _bassetQuantity, address _recipient)
        external returns (uint256 massetMinted);

    /// @dev Swapping
    function swap( address _input, address _output, uint256 _quantity, address _recipient)
        external returns (uint256 output);
    function getSwapOutput( address _input, address _output, uint256 _quantity)
        external view returns (bool, string memory, uint256 output);

    /// @dev Redeeming
    function redeem(address _basset, uint256 _bassetQuantity)
        external returns (uint256 massetRedeemed);
    function redeemTo(address _basset, uint256 _bassetQuantity, address _recipient)
        external returns (uint256 massetRedeemed);
    function redeemMulti(address[] calldata _bAssets, uint256[] calldata _bassetQuantities, address _recipient)
        external returns (uint256 massetRedeemed);
    function redeemMasset(uint256 _mAssetQuantity, address _recipient) external;

    /// @dev Setters for the Manager or Gov to update module info
    function upgradeForgeValidator(address _newForgeValidator) external;

    /// @dev Setters for Gov to set system params
    function setSwapFee(uint256 _swapFee) external;

    /// @dev Getters
    function getBasketManager() external view returns(address);
    function forgeValidator() external view returns (address);
    function totalSupply() external view returns (uint256);
    function swapFee() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IPool {

    function openFarm() external;

    function distributeBonusRewards(uint256 amount) external;

    function stake(uint256 amount) external;

    function stakeTo(address recipient, uint256 amount) external;

    function withdraw(uint256 amount) external;

    function withdrawTo(address recipient, uint256 amount) external;

    function claimReward() external;

    function claimRewardTo(address recipient) external;

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

interface ISDvd is IERC20 {

    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;

    function setMinter(address account, bool value) external;

    function setNoFeeAddress(address account, bool value) external;

    function setPairAddress(address _pairAddress) external;

    function snapshot() external returns (uint256);

    function syncPairTokenTotalSupply() external returns (bool isPairTokenBurned);

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface ITreasury {

    function release() external;

}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function migrator() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
    function setMigrator(address) external;
}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IVault {

    function savingsContract() external view returns (address);

    function musd() external view returns (address);

    function deposit(uint256) external;

    function redeem(uint256) external;

    function getBalance() external view returns (uint256);

}

// SPDX-License-Identifier: Unlicensed

pragma solidity >=0.5.0;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// SPDX-License-Identifier: Unlicensed

pragma solidity ^0.6.12;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';
import '@openzeppelin/contracts/math/SafeMath.sol';
import '@openzeppelin/contracts/utils/ReentrancyGuard.sol';
import "./uniswapv2/interfaces/IUniswapV2Factory.sol";
import "./uniswapv2/interfaces/IUniswapV2Router02.sol";
import "./uniswapv2/interfaces/IWETH.sol";
import './interfaces/IERC20Snapshot.sol';
import './interfaces/ITreasury.sol';
import './interfaces/IVault.sol';
import './interfaces/IMasset.sol';
import './interfaces/IDvd.sol';
import './interfaces/ISDvd.sol';
import './interfaces/IPool.sol';
import './interfaces/IBPool.sol';
import './utils/MathUtils.sol';

/// @title Lord of Coin
/// @notice Lord of Coin finds the money, for you - to spend it.
/// @author Lord Nami
// Special thanks to TRIB as inspiration.
// Special thanks to Lord Nami mods @AspieJames, @defimoon, @tectumor, @downsin, @ghost, @LordFes, @converge, @cryptycreepy, @cryptpower, @jonsnow
// and everyone else who support this project by spreading the words on social media.
contract LordOfCoin is ReentrancyGuard {
    using SafeMath for uint256;
    using MathUtils for uint256;
    using SafeERC20 for IERC20;

    event Bought(address indexed sender, address indexed recipient, uint256 musdAmount, uint256 dvdReceived);
    event Sold(address indexed sender, address indexed recipient, uint256 dvdAmount, uint256 musdReceived);
    event SoldToETH(address indexed sender, address indexed recipient, uint256 dvdAmount, uint256 ethReceived);

    event DividendClaimed(address indexed recipient, uint256 musdReceived);
    event DividendClaimedETH(address indexed recipient, uint256 ethReceived);
    event Received(address indexed from, uint256 amount);

    /// @notice Applied to every buy or sale of DVD.
    /// @dev Tax denominator
    uint256 public constant CURVE_TAX_DENOMINATOR = 10;

    /// @notice Applied to every buy of DVD before bonding curve tax.
    /// @dev Tax denominator
    uint256 public constant BUY_TAX_DENOMINATOR = 20;

    /// @notice Applied to every sale of DVD after bonding curve tax.
    /// @dev Tax denominator
    uint256 public constant SELL_TAX_DENOMINATOR = 10;

    /// @notice The slope of the bonding curve.
    uint256 public constant DIVIDER = 1000000; // 1 / multiplier 0.000001 (so that we don't deal with decimals)

    /// @notice Address in which DVD are sent to be burned.
    /// These DVD can't be redeemed by the reserve.
    address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;

    /// @dev Uniswap router
    IUniswapV2Router02 uniswapRouter;

    /// @dev WETH token address
    address weth;

    /// @dev Balancer pool WETH-MUSD
    address balancerPool;

    /// @dev mUSD token mStable address.
    address musd;

    /// @notice Dvd token instance.
    address public dvd;

    /// @notice SDvd token instance.
    address public sdvd;

    /// @notice Pair address for SDVD-ETH on uniswap
    address public sdvdEthPairAddress;

    /// @notice SDVD-ETH farming pool.
    address public sdvdEthPool;

    /// @notice DVD farming pool.
    address public dvdPool;

    /// @notice Dev treasury.
    address public devTreasury;

    /// @notice Pool treasury.
    address public poolTreasury;

    /// @notice Trading treasury.
    address public tradingTreasury;

    /// @notice Total dividend earned since the contract deployment.
    uint256 public totalDividendClaimed;

    /// @notice Total reserve value that backs all DVD in circulation.
    /// @dev Area below the bonding curve.
    uint256 public totalReserve;

    /// @notice Interface for integration with mStable.
    address public vault;

    /// @notice Current state of the application.
    /// Either already open (true) or not yet (false).
    bool public isMarketOpen = false;

    /// @notice Market will be open on this timestamp
    uint256 public marketOpenTime;

    /// @notice Current snapshot id
    /// Can be thought as week index, since snapshot is increased per week
    uint256 public snapshotId;

    /// @notice Snapshot timestamp.
    uint256 public snapshotTime;

    /// @notice Snapshot duration.
    uint256 public SNAPSHOT_DURATION = 1 weeks;

    /// @dev Total profits on each snapshot id.
    mapping(uint256 => uint256) private _totalProfitSnapshots;

    /// @dev Dividend paying SDVD supply on each snapshot id.
    mapping(uint256 => uint256) private _dividendPayingSDVDSupplySnapshots;

    /// @dev Flag to determine if account has claim their dividend on each snapshot id.
    mapping(address => mapping(uint256 => bool)) private _isDividendClaimedSnapshots;

    receive() external payable {
        emit Received(msg.sender, msg.value);
    }

    constructor(
        address _vault,
        address _uniswapRouter,
        address _balancerPool,
        address _dvd,
        address _sdvd,
        address _sdvdEthPool,
        address _dvdPool,
        address _devTreasury,
        address _poolTreasury,
        address _tradingTreasury,
        uint256 _marketOpenTime
    ) public {
        // Set vault
        vault = _vault;
        // mUSD instance
        musd = IVault(vault).musd();
        // Approve vault to manage mUSD in this contract
        _approveMax(musd, vault);

        // Set uniswap router
        uniswapRouter = IUniswapV2Router02(_uniswapRouter);
        // Set balancer pool
        balancerPool = _balancerPool;

        // Set weth address
        weth = uniswapRouter.WETH();

        // Approve balancer pool to manage mUSD in this contract
        _approveMax(musd, balancerPool);
        // Approve balancer pool to manage WETH in this contract
        _approveMax(weth, balancerPool);
        // Approve self to spend mUSD in this contract (used to buy from ETH / sell to ETH)
        _approveMax(musd, address(this));

        dvd = _dvd;
        sdvd = _sdvd;
        sdvdEthPool = _sdvdEthPool;
        dvdPool = _dvdPool;
        devTreasury = _devTreasury;
        poolTreasury = _poolTreasury;
        tradingTreasury = _tradingTreasury;

        // Create SDVD ETH pair
        sdvdEthPairAddress = IUniswapV2Factory(uniswapRouter.factory()).createPair(sdvd, weth);

        // Set open time
        marketOpenTime = _marketOpenTime;
        // Set initial snapshot timestamp
        snapshotTime = _marketOpenTime;
    }

    /* ========== Modifier ========== */

    modifier marketOpen() {
        require(isMarketOpen, 'Market not open');
        _;
    }

    modifier onlyTradingTreasury() {
        require(msg.sender == tradingTreasury, 'Only treasury');
        _;
    }

    /* ========== Trading Treasury Only ========== */

    /// @notice Deposit trading profit to vault
    function depositTradingProfit(uint256 amount) external onlyTradingTreasury {
        // Deposit mUSD to vault
        IVault(vault).deposit(amount);
    }

    /* ========== Mutative ========== */

    /// @notice Exchanges mUSD to DVD.
    /// @dev mUSD to be exchanged needs to be approved first.
    /// @param musdAmount mUSD amount to be exchanged.
    function buy(uint256 musdAmount) external nonReentrant returns (uint256 recipientDVD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        return _buy(msg.sender, msg.sender, musdAmount);
    }

    /// @notice Exchanges mUSD to DVD.
    /// @dev mUSD to be exchanged needs to be approved first.
    /// @param recipient Recipient of DVD token.
    /// @param musdAmount mUSD amount to be exchanged.
    function buyTo(address recipient, uint256 musdAmount) external nonReentrant returns (uint256 recipientDVD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        return _buy(msg.sender, recipient, musdAmount);
    }

    /// @notice Exchanges ETH to DVD.
    function buyFromETH() payable external nonReentrant returns (uint256 recipientDVD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        return _buy(address(this), msg.sender, _swapETHToMUSD(address(this), msg.value));
    }

    /// @notice Exchanges DVD to mUSD.
    /// @param dvdAmount DVD amount to be exchanged.
    function sell(uint256 dvdAmount) external nonReentrant marketOpen returns (uint256 returnedMUSD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        return _sell(msg.sender, msg.sender, dvdAmount);
    }

    /// @notice Exchanges DVD to mUSD.
    /// @param recipient Recipient of mUSD.
    /// @param dvdAmount DVD amount to be exchanged.
    function sellTo(address recipient, uint256 dvdAmount) external nonReentrant marketOpen returns (uint256 returnedMUSD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        return _sell(msg.sender, recipient, dvdAmount);
    }

    /// @notice Exchanges DVD to ETH.
    /// @param dvdAmount DVD amount to be exchanged.
    function sellToETH(uint256 dvdAmount) external nonReentrant marketOpen returns (uint256 returnedETH, uint256 returnedMUSD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        // Sell DVD and receive mUSD in this contract
        (returnedMUSD, marketTax, curveTax, taxedDVD) = _sell(msg.sender, address(this), dvdAmount);
        // Swap received mUSD dividend for ether and send it back to sender
        returnedETH = _swapMUSDToETH(msg.sender, returnedMUSD);

        emit SoldToETH(msg.sender, msg.sender, dvdAmount, returnedETH);
    }

    /// @notice Claim dividend in mUSD.
    function claimDividend() external nonReentrant marketOpen returns (uint256 dividend) {
        return _claimDividend(msg.sender, msg.sender);
    }

    /// @notice Claim dividend in mUSD.
    /// @param recipient Recipient of mUSD.
    function claimDividendTo(address recipient) external nonReentrant marketOpen returns (uint256 dividend) {
        return _claimDividend(msg.sender, recipient);
    }

    /// @notice Claim dividend in ETH.
    function claimDividendETH() external nonReentrant marketOpen returns (uint256 dividend, uint256 receivedETH) {
        // Claim dividend to this contract
        dividend = _claimDividend(msg.sender, address(this));
        // Swap received mUSD dividend for ether and send it back to sender
        receivedETH = _swapMUSDToETH(msg.sender, dividend);

        emit DividendClaimedETH(msg.sender, receivedETH);
    }

    /// @notice Check if we need to create new snapshot.
    function checkSnapshot() public {
        if (isMarketOpen) {
            // If time has passed for 1 week since last snapshot
            // and market is open
            if (snapshotTime.add(SNAPSHOT_DURATION) <= block.timestamp) {
                // Update snapshot timestamp
                snapshotTime = block.timestamp;
                // Take new snapshot
                snapshotId = ISDvd(sdvd).snapshot();
                // Save the interest
                _totalProfitSnapshots[snapshotId] = totalProfit();
                // Save dividend paying supply
                _dividendPayingSDVDSupplySnapshots[snapshotId] = dividendPayingSDVDSupply();
            }
            // If something wrong / there is no interest, lets try again.
            if (snapshotId > 0 && _totalProfitSnapshots[snapshotId] == 0) {
                _totalProfitSnapshots[snapshotId] = totalProfit();
            }
        }
    }

    /// @notice Release treasury.
    function releaseTreasury() public {
        if (isMarketOpen) {
            ITreasury(devTreasury).release();
            ITreasury(poolTreasury).release();
            ITreasury(tradingTreasury).release();
        }
    }

    /* ========== View ========== */

    /// @notice Get claimable dividend for address.
    /// @param account Account address.
    /// @return dividend Dividend in mUSD.
    function claimableDividend(address account) public view returns (uint256 dividend) {
        // If there is no snapshot or already claimed
        if (snapshotId == 0 || isDividendClaimedAt(account, snapshotId)) {
            return 0;
        }

        // Get sdvd balance at snapshot
        uint256 sdvdBalance = IERC20Snapshot(sdvd).balanceOfAt(account, snapshotId);
        if (sdvdBalance == 0) {
            return 0;
        }

        // Get dividend in mUSD based on SDVD balance
        dividend = sdvdBalance
        .mul(claimableProfitAt(snapshotId))
        .div(dividendPayingSDVDSupplyAt(snapshotId));
    }

    /// @notice Total mUSD that is now forever locked in the protocol.
    function totalLockedReserve() external view returns (uint256) {
        return _calculateReserveFromSupply(dvdBurnedAmount());
    }

    /// @notice Total claimable profit.
    /// @return Total claimable profit in mUSD.
    function claimableProfit() public view returns (uint256) {
        return totalProfit().div(2);
    }

    /// @notice Total claimable profit in snapshot.
    /// @return Total claimable profit in mUSD.
    function claimableProfitAt(uint256 _snapshotId) public view returns (uint256) {
        return totalProfitAt(_snapshotId).div(2);
    }

    /// @notice Total profit.
    /// @return Total profit in MUSD.
    function totalProfit() public view returns (uint256) {
        uint256 vaultBalance = IVault(vault).getBalance();
        // Sometimes mStable returns a value lower than the
        // deposit because their exchange rate gets updated after the deposit.
        if (vaultBalance < totalReserve) {
            vaultBalance = totalReserve;
        }
        return vaultBalance.sub(totalReserve);
    }

    /// @notice Total profit in snapshot.
    /// @param _snapshotId Snapshot id.
    /// @return Total profit in MUSD.
    function totalProfitAt(uint256 _snapshotId) public view returns (uint256) {
        return _totalProfitSnapshots[_snapshotId];
    }

    /// @notice Check if dividend already claimed by account.
    /// @return Is dividend claimed.
    function isDividendClaimedAt(address account, uint256 _snapshotId) public view returns (bool) {
        return _isDividendClaimedSnapshots[account][_snapshotId];
    }

    /// @notice Total supply of DVD. This includes burned DVD.
    /// @return Total supply of DVD in wei.
    function dvdTotalSupply() public view returns (uint256) {
        return IERC20(dvd).totalSupply();
    }

    /// @notice Total DVD that have been burned.
    /// @dev These DVD are still in circulation therefore they
    /// are still considered on the bonding curve formula.
    /// @return Total burned DVD in wei.
    function dvdBurnedAmount() public view returns (uint256) {
        return IERC20(dvd).balanceOf(BURN_ADDRESS);
    }

    /// @notice DVD price in wei according to the bonding curve formula.
    /// @return Current DVD price in wei.
    function dvdPrice() external view returns (uint256) {
        // price = supply * multiplier
        return dvdTotalSupply().roundedDiv(DIVIDER);
    }

    /// @notice DVD price floor in wei according to the bonding curve formula.
    /// @return Current DVD price floor in wei.
    function dvdPriceFloor() external view returns (uint256) {
        return dvdBurnedAmount().roundedDiv(DIVIDER);
    }

    /// @notice Total supply of Dividend-paying SDVD.
    /// @return Total supply of SDVD in wei.
    function dividendPayingSDVDSupply() public view returns (uint256) {
        // Get total supply
        return IERC20(sdvd).totalSupply()
        // Get sdvd in uniswap pair balance
        .sub(IERC20(sdvd).balanceOf(sdvdEthPairAddress))
        // Get sdvd in SDVD-ETH pool
        .sub(IERC20(sdvd).balanceOf(sdvdEthPool))
        // Get sdvd in DVD pool
        .sub(IERC20(sdvd).balanceOf(dvdPool))
        // Get sdvd in pool treasury
        .sub(IERC20(sdvd).balanceOf(poolTreasury))
        // Get sdvd in dev treasury
        .sub(IERC20(sdvd).balanceOf(devTreasury))
        // Get sdvd in trading treasury
        .sub(IERC20(sdvd).balanceOf(tradingTreasury));
    }

    /// @notice Total supply of Dividend-paying SDVD in snapshot.
    /// @return Total supply of SDVD in wei.
    function dividendPayingSDVDSupplyAt(uint256 _snapshotId) public view returns (uint256) {
        return _dividendPayingSDVDSupplySnapshots[_snapshotId];
    }

    /// @notice Calculates the amount of DVD in exchange for reserve after applying bonding curve tax.
    /// @param reserveAmount Reserve value in wei to use in the conversion.
    /// @return Token amount in wei after the 10% tax has been applied.
    function reserveToDVDTaxed(uint256 reserveAmount) external view returns (uint256) {
        if (reserveAmount == 0) {
            return 0;
        }
        uint256 tax = reserveAmount.div(CURVE_TAX_DENOMINATOR);
        uint256 totalDVD = reserveToDVD(reserveAmount);
        uint256 taxedDVD = reserveToDVD(tax);
        return totalDVD.sub(taxedDVD);
    }

    /// @notice Calculates the amount of reserve in exchange for DVD after applying bonding curve tax.
    /// @param tokenAmount Token value in wei to use in the conversion.
    /// @return Reserve amount in wei after the 10% tax has been applied.
    function dvdToReserveTaxed(uint256 tokenAmount) external view returns (uint256) {
        if (tokenAmount == 0) {
            return 0;
        }
        uint256 reserveAmount = dvdToReserve(tokenAmount);
        uint256 tax = reserveAmount.div(CURVE_TAX_DENOMINATOR);
        return reserveAmount.sub(tax);
    }

    /// @notice Calculates the amount of DVD in exchange for reserve.
    /// @param reserveAmount Reserve value in wei to use in the conversion.
    /// @return Token amount in wei.
    function reserveToDVD(uint256 reserveAmount) public view returns (uint256) {
        return _calculateReserveToDVD(reserveAmount, totalReserve, dvdTotalSupply());
    }

    /// @notice Calculates the amount of reserve in exchange for DVD.
    /// @param tokenAmount Token value in wei to use in the conversion.
    /// @return Reserve amount in wei.
    function dvdToReserve(uint256 tokenAmount) public view returns (uint256) {
        return _calculateDVDToReserve(tokenAmount, dvdTotalSupply(), totalReserve);
    }

    /* ========== Internal ========== */

    /// @notice Check if market can be opened
    function _checkOpenMarket() internal {
        require(marketOpenTime <= block.timestamp, 'Market not open');
        if (!isMarketOpen) {
            // Set flag
            isMarketOpen = true;
        }
    }

    /// @notice Exchanges mUSD to DVD.
    /// @dev mUSD to be exchanged needs to be approved first.
    /// @param sender Address that has mUSD token.
    /// @param recipient Address that will receive DVD token.
    /// @param musdAmount mUSD amount to be exchanged.
    function _buy(address sender, address recipient, uint256 musdAmount) internal returns (uint256 returnedDVD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        _checkOpenMarket();
        checkSnapshot();
        releaseTreasury();

        require(musdAmount > 0, 'Cannot buy 0');

        // Tax to be included as profit
        marketTax = musdAmount.div(BUY_TAX_DENOMINATOR);
        // Get amount after market tax
        uint256 inAmount = musdAmount.sub(marketTax);

        // Calculate bonding curve tax in mUSD
        curveTax = inAmount.div(CURVE_TAX_DENOMINATOR);

        // Convert mUSD amount to DVD amount
        uint256 totalDVD = reserveToDVD(inAmount);
        // Convert tax to DVD amount
        taxedDVD = reserveToDVD(curveTax);
        // Calculate DVD for recipient
        returnedDVD = totalDVD.sub(taxedDVD);

        // Transfer mUSD from sender to this contract
        IERC20(musd).safeTransferFrom(sender, address(this), musdAmount);

        // Deposit mUSD to vault
        IVault(vault).deposit(musdAmount);
        // Increase mUSD total reserve
        totalReserve = totalReserve.add(inAmount);

        // Send taxed DVD to burn address
        IDvd(dvd).mint(BURN_ADDRESS, taxedDVD);
        // Increase recipient DVD balance
        IDvd(dvd).mint(recipient, returnedDVD);
        // Increase user DVD Shareholder point
        IDvd(dvd).increaseShareholderPoint(recipient, returnedDVD);

        emit Bought(sender, recipient, musdAmount, returnedDVD);
    }

    /// @notice Exchanges DVD to mUSD.
    /// @param sender Address that has DVD token.
    /// @param recipient Address that will receive mUSD token.
    /// @param dvdAmount DVD amount to be exchanged.
    function _sell(address sender, address recipient, uint256 dvdAmount) internal returns (uint256 returnedMUSD, uint256 marketTax, uint256 curveTax, uint256 taxedDVD) {
        checkSnapshot();
        releaseTreasury();

        require(dvdAmount <= IERC20(dvd).balanceOf(sender), 'Insufficient balance');
        require(dvdAmount > 0, 'Cannot sell 0');
        require(IDvd(dvd).shareholderPointOf(sender) >= dvdAmount, 'Insufficient shareholder points');

        // Convert number of DVD amount that user want to sell to mUSD amount
        uint256 reserveAmount = dvdToReserve(dvdAmount);
        // Calculate tax in mUSD
        curveTax = reserveAmount.div(CURVE_TAX_DENOMINATOR);
        // Make sure fee is enough
        require(curveTax >= 1, 'Insufficient tax');

        // Get net amount
        uint256 net = reserveAmount.sub(curveTax);

        // Calculate taxed DVD
        taxedDVD = _calculateReserveToDVD(
            curveTax,
            totalReserve.sub(reserveAmount),
            dvdTotalSupply().sub(dvdAmount)
        );

        // Tax to be included as profit
        marketTax = net.div(SELL_TAX_DENOMINATOR);
        // Get musd amount for recipient
        returnedMUSD = net.sub(marketTax);

        // Decrease total reserve
        totalReserve = totalReserve.sub(net);

        // Reduce user DVD balance
        IDvd(dvd).burn(sender, dvdAmount);
        // Send taxed DVD to burn address
        IDvd(dvd).mint(BURN_ADDRESS, taxedDVD);
        // Decrease sender DVD Shareholder point
        IDvd(dvd).decreaseShareholderPoint(sender, dvdAmount);

        // Redeem mUSD from vault
        IVault(vault).redeem(returnedMUSD);
        // Send mUSD to recipient
        IERC20(musd).safeTransfer(recipient, returnedMUSD);

        emit Sold(sender, recipient, dvdAmount, returnedMUSD);
    }

    /// @notice Claim dividend in mUSD.
    /// @param sender Address that has SDVD token.
    /// @param recipient Address that will receive mUSD dividend.
    function _claimDividend(address sender, address recipient) internal returns (uint256 dividend) {
        checkSnapshot();
        releaseTreasury();

        // Get dividend in mUSD based on SDVD balance
        dividend = claimableDividend(sender);
        require(dividend > 0, 'No dividend');

        // Set dividend as claimed
        _isDividendClaimedSnapshots[sender][snapshotId] = true;

        // Redeem mUSD from vault
        IVault(vault).redeem(dividend);
        // Send dividend mUSD to user
        IERC20(musd).safeTransfer(recipient, dividend);

        emit DividendClaimed(recipient, dividend);
    }

    /// @notice Swap ETH to mUSD in this contract.
    /// @param amount ETH amount.
    /// @return musdAmount returned mUSD amount.
    function _swapETHToMUSD(address recipient, uint256 amount) internal returns (uint256 musdAmount) {
        // Convert ETH to WETH
        IWETH(weth).deposit{ value: amount }();
        // Swap WETH to mUSD
        (musdAmount,) = IBPool(balancerPool).swapExactAmountIn(weth, amount, musd, 0, uint256(-1));
        // Send mUSD
        if (recipient != address(this)) {
            IERC20(musd).safeTransfer(recipient, musdAmount);
        }
    }

    /// @notice Swap mUSD to ETH in this contract.
    /// @param amount mUSD Amount.
    /// @return ethAmount returned ETH amount.
    function _swapMUSDToETH(address recipient, uint256 amount) internal returns (uint256 ethAmount) {
        // Swap mUSD to WETH
        (ethAmount,) = IBPool(balancerPool).swapExactAmountIn(musd, amount, weth, 0, uint256(-1));
        // Convert WETH to ETH
        IWETH(weth).withdraw(ethAmount);
        // Send ETH
        if (recipient != address(this)) {
            payable(recipient).transfer(ethAmount);
        }
    }

    /// @notice Approve maximum value to spender
    function _approveMax(address tkn, address spender) internal {
        uint256 max = uint256(- 1);
        IERC20(tkn).safeApprove(spender, max);
    }

    /**
     * Supply (s), reserve (r) and token price (p) are in a relationship defined by the bonding curve:
     *      p = m * s
     * The reserve equals to the area below the bonding curve
     *      r = s^2 / 2
     * The formula for the supply becomes
     *      s = sqrt(2 * r / m)
     *
     * In solidity computations, we are using divider instead of multiplier (because its an integer).
     * All values are decimals with 18 decimals (represented as uints), which needs to be compensated for in
     * multiplications and divisions
     */

    /// @notice Computes the increased supply given an amount of reserve.
    /// @param _reserveDelta The amount of reserve in wei to be used in the calculation.
    /// @param _totalReserve The current reserve state to be used in the calculation.
    /// @param _supply The current supply state to be used in the calculation.
    /// @return _supplyDelta token amount in wei.
    function _calculateReserveToDVD(
        uint256 _reserveDelta,
        uint256 _totalReserve,
        uint256 _supply
    ) internal pure returns (uint256 _supplyDelta) {
        uint256 _reserve = _totalReserve;
        uint256 _newReserve = _reserve.add(_reserveDelta);
        // s = sqrt(2 * r / m)
        uint256 _newSupply = MathUtils.sqrt(
            _newReserve
            .mul(2)
            .mul(DIVIDER) // inverse the operation (Divider instead of multiplier)
            .mul(1e18) // compensation for the squared unit
        );

        _supplyDelta = _newSupply.sub(_supply);
    }

    /// @notice Computes the decrease in reserve given an amount of DVD.
    /// @param _supplyDelta The amount of DVD in wei to be used in the calculation.
    /// @param _supply The current supply state to be used in the calculation.
    /// @param _totalReserve The current reserve state to be used in the calculation.
    /// @return _reserveDelta Reserve amount in wei.
    function _calculateDVDToReserve(
        uint256 _supplyDelta,
        uint256 _supply,
        uint256 _totalReserve
    ) internal pure returns (uint256 _reserveDelta) {
        require(_supplyDelta <= _supply, 'Token amount must be less than the supply');

        uint256 _newSupply = _supply.sub(_supplyDelta);
        uint256 _newReserve = _calculateReserveFromSupply(_newSupply);
        _reserveDelta = _totalReserve.sub(_newReserve);
    }

    /// @notice Calculates reserve given a specific supply.
    /// @param _supply The token supply in wei to be used in the calculation.
    /// @return _reserve Reserve amount in wei.
    function _calculateReserveFromSupply(uint256 _supply) internal pure returns (uint256 _reserve) {
        // r = s^2 * m / 2
        _reserve = _supply
        .mul(_supply)
        .div(DIVIDER) // inverse the operation (Divider instead of multiplier)
        .div(2)
        .roundedDiv(1e18);
        // correction of the squared unit
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

//
// @title   MassetStructs
// @author  Stability Labs Pty. Ltd.
// @notice  Structs used in the Masset contract and associated Libs

interface MassetStructs {

    // Stores high level basket info
    struct Basket {

        // Array of Bassets currently active
        Basset[] bassets;

        // Max number of bAssets that can be present in any Basket
        uint8 maxBassets;

        // Some bAsset is undergoing re-collateralisation
        bool undergoingRecol;

        //
        // In the event that we do not raise enough funds from the auctioning of a failed Basset,
        // The Basket is deemed as failed, and is undercollateralised to a certain degree.
        // The collateralisation ratio is used to calc Masset burn rate.
        
        bool failed;
        uint256 collateralisationRatio;

    }

    // Stores bAsset info. The struct takes 5 storage slots per Basset
    struct Basset {

        // Address of the bAsset
        address addr;

        // Status of the basset, 
        BassetStatus status; // takes uint8 datatype (1 byte) in storage

        // An ERC20 can charge transfer fee, for example USDT, DGX tokens.
        bool isTransferFeeCharged; // takes a byte in storage

        //
        // 1 Basset * ratio / ratioScale == x Masset (relative value)
        //      If ratio == 10e8 then 1 bAsset = 10 mAssets
        //      A ratio is divised as 10^(18-tokenDecimals) * measurementMultiple(relative value of 1 base unit)
        
        uint256 ratio;

        // Target weights of the Basset (100% == 1e18)
        uint256 maxWeight;

        // Amount of the Basset that is held in Collateral
        uint256 vaultBalance;

    }

    // Status of the Basset - has it broken its peg?
    enum BassetStatus {
        Default,
        Normal,
        BrokenBelowPeg,
        BrokenAbovePeg,
        Blacklisted,
        Liquidating,
        Liquidated,
        Failed
    }

    // Internal details on Basset
    struct BassetDetails {
        Basset bAsset;
        address integrator;
        uint8 index;
    }

    // All details needed to Forge with multiple bAssets
    struct ForgePropsMulti {
        bool isValid; // Flag to signify that forge bAssets have passed validity check
        Basset[] bAssets;
        address[] integrators;
        uint8[] indexes;
    }

    // All details needed for proportionate Redemption
    struct RedeemPropsMulti {
        uint256 colRatio;
        Basset[] bAssets;
        address[] integrators;
        uint8[] indexes;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.16 <0.7.0;

import '@openzeppelin/contracts/math/SafeMath.sol';

library MathUtils {
    using SafeMath for uint256;

    /// @notice Calculates the square root of a given value.
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
        // else z = 0
    }

    /// @notice Rounds a division result.
    function roundedDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, 'div by 0');

        uint256 halfB = (b.mod(2) == 0) ? (b.div(2)) : (b.div(2).add(1));
        return (a.mod(b) >= halfB) ? (a.div(b).add(1)) : (a.div(b));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

{
  "compilationTarget": {
    "contracts/LordOfCoin.sol": "LordOfCoin"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}