// File: contracts/CapitalComponentToken.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

import "./interfaces/PriceOracle.sol";
import "./SplitVault.sol";
import "./VaultControlled.sol";
import "./lib/DSMath.sol";

contract CapitalComponentToken is ERC20, VaultControlled {
  using SafeMath for uint256;

  address public fullToken;
  PriceOracle private priceOracle;

  constructor(
    string memory name,
    string memory symbol,
    address _fullToken,
    address priceOracleAddress,
    address splitVaultAddress
  ) public ERC20(name, symbol) VaultControlled(splitVaultAddress) {
    priceOracle = PriceOracle(priceOracleAddress);
    splitVault = SplitVault(splitVaultAddress);
    fullToken = _fullToken;
  }

  /// @dev Mint new capital component tokens, but compute the amount from an amount of full tokens.
  /// @param account address of account to mint tokens to
  /// @param amountOfFull amount of full tokens to use for the calculation
  function mintFromFull(address account, uint256 amountOfFull) public onlyVaultOrOwner {
    uint256 price = priceOracle.getPrice(fullToken);
    uint256 componentTokenAmount = DSMath.wmul(amountOfFull, price);
    _mint(account, componentTokenAmount);
  }

  /// @dev Mint new tokens if the contract owner
  /// @param account address of account to mint tokens to
  /// @param amount amount of tokens to mint
  function mint(address account, uint256 amount) public onlyOwner {
    _mint(account, amount);
  }

  /// @dev Burn tokens if the contract owner
  /// @param account address of account to burn tokens from
  /// @param amount amount of tokens to burn
  function burn(address account, uint256 amount) public onlyVaultOrOwner {
    _burn(account, amount);
    uint256 payoutAmount = calculatePayoutAmount(amount);
    // Call the payout function on the SplitVault contract
    splitVault.payout(payoutAmount, fullToken, account);
  }

  /// @dev Simplest public method for calculating the amount of fullToken due for a given amount of capital token
  /// @param capitalTokenAmount Amount of capital token to calculate the payout from
  /// @return The payout amount denoted in fullToken
  function calculatePayoutAmount(uint256 capitalTokenAmount) public view returns (uint256) {
    uint256 currPrice = priceOracle.getPrice(fullToken);
    return calculatePayoutAmount(capitalTokenAmount, currPrice);
  }

  /// @dev Pure function for calculating the amount of fullToken due for a given amount of capital token
  /// @param capitalTokenAmount Amount of capital token to calculate the payout from
  /// @param currPrice The current price of the fullToken with respect to the underlying
  /// @return The payout amount denoted in fullToken
  function calculatePayoutAmount(uint256 capitalTokenAmount, uint256 currPrice) public pure returns (uint256) {
    uint256 payoutAmount = DSMath.wdiv(capitalTokenAmount, currPrice);
    return payoutAmount;
  }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: @openzeppelin/contracts/GSN/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// File: @openzeppelin/contracts/math/SafeMath.sol



// 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;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// 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);
            }
        }
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/interfaces/PriceOracle.sol



// //SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

interface PriceOracle {
  /// @dev Get the price of token in another token (eg. cBAT / BAT) with 18 decimal places
  function getPrice(address token) external view returns (uint256);
}

// File: contracts/SplitVault.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "./CapitalComponentToken.sol";
import "./YieldComponentToken.sol";

contract SplitVault is Ownable {
  /*
   *  Storage
   */
  struct ComponentSet {
    address yieldToken;
    address capitalToken;
  }
  mapping(address => ComponentSet) public tokensToComponents;

  constructor() public {}

  /// @dev Retrieve the componentSet for a given token
  /// @param tokenAddress for which to fetch the associated componentSet
  function getComponentSet(address tokenAddress) public view returns (ComponentSet memory) {
    return tokensToComponents[tokenAddress];
  }

  /// @dev Allows Split protocol governance to add support for new tokens
  /// @param tokenAddress the address of token to support
  /// @param yieldTokenAddress the corresponding yieldERC20Comp token address
  /// @param capitalTokenAddress the corresponding capitalERC20Comp token address
  function add(
    address tokenAddress,
    address yieldTokenAddress,
    address capitalTokenAddress
  ) public onlyOwner {
    tokensToComponents[tokenAddress] = ComponentSet({
      yieldToken: yieldTokenAddress,
      capitalToken: capitalTokenAddress
    });
  }

  /// @dev Allows Split protocol governance to remove support for new tokens
  /// @param tokenAddress the address of token to remove support for
  function remove(address tokenAddress) public onlyOwner {
    delete tokensToComponents[tokenAddress];
  }

  /// @dev Allows a holder of a whitelisted Compound token to split it into it's corresponding Yield and Capital tokens
  /// @param amount of tokens to split
  /// @param tokenAddress the address of token to split
  function split(uint256 amount, address tokenAddress) public {
    ComponentSet memory componentSet = tokensToComponents[tokenAddress];
    if (componentSet.yieldToken == address(0) || componentSet.capitalToken == address(0)) {
      revert("Attempted to split unsupported token");
    }
    // Don't mint tokens if the transferFrom was not successful
    require(
      IERC20(tokenAddress).transferFrom(msg.sender, address(this), amount),
      "Failed to transfer tokens to SplitVault."
    );
    CapitalComponentToken(componentSet.capitalToken).mintFromFull(msg.sender, amount);
    YieldComponentToken(componentSet.yieldToken).mintFromFull(msg.sender, amount);
    emit Split(tokenAddress, amount);
  }

  /// @dev Allows a holder of both Yield and Capital tokens to combine them into the underlying full tokens
  /// @param amount of tokens to recombine
  /// @param tokenAddress is the address of token to recombine
  function combine(uint256 amount, address tokenAddress) public {
    ComponentSet memory componentSet = tokensToComponents[tokenAddress];
    if (componentSet.yieldToken == address(0) || componentSet.capitalToken == address(0)) {
      revert("Attempted to recombine unsupported token");
    }
    CapitalComponentToken(componentSet.capitalToken).burn(msg.sender, amount);
    YieldComponentToken(componentSet.yieldToken).burn(msg.sender, amount);
    // Payout is calculated and executed by the individual token contracts
    emit Combine(tokenAddress, amount);
  }

  /// @dev Allows component token implementation to send tokens in the vaul
  /// @param amount of tokens to payout
  /// @param tokenAddress the tokens to send
  /// @param recipient address of payout recipient
  function payout(
    uint256 amount,
    address tokenAddress,
    address recipient
  ) public {
    ComponentSet memory componentSet = tokensToComponents[tokenAddress];
    if (componentSet.yieldToken == address(0) || componentSet.capitalToken == address(0)) {
      revert("Attempted to request a payout for an unsupported token");
    }
    if (msg.sender != componentSet.yieldToken && msg.sender != componentSet.capitalToken) {
      revert("Payout can only be called by the corresponding yield or capital token");
    }
    // Revert if the transfer was not successful
    require(IERC20(tokenAddress).transfer(recipient, amount), "Failed to transfer tokens from SplitVault.");
  }

  /// @dev Emitted when component tokens are combined into a full token
  event Combine(address indexed tokenAddress, uint256 amount);

  /// @dev Emitted when full tokens are split into component tokens
  event Split(address indexed tokenAddress, uint256 amount);
}

// File: contracts/YieldComponentToken.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

import "./interfaces/PriceOracle.sol";
import "./SplitVault.sol";
import "./VaultControlled.sol";
import "./lib/ERC20Base.sol";
import "./lib/DSMath.sol";

contract YieldComponentToken is ERC20Base, VaultControlled {
  using SafeMath for uint256;

  /*
   *  Storage
   */
  address public fullToken;
  PriceOracle private priceOracle;

  /// @dev The yield component token balances
  mapping(address => uint256) public balances;
  /// @dev The price from the last yield payout for an address
  mapping(address => uint256) public lastPrices;

  constructor(
    string memory name,
    string memory symbol,
    address _fullToken,
    address priceOracleAddress,
    address splitVaultAddress
  ) public ERC20Base(name, symbol) VaultControlled(splitVaultAddress) {
    priceOracle = PriceOracle(priceOracleAddress);
    fullToken = _fullToken;
  }

  /// @dev Mint new yield component tokens, computing the amount from an amount of full tokens
  /// @param account address of account to mint tokens to
  /// @param amountOfFull amount of full tokens to use for the calculation
  function mintFromFull(address account, uint256 amountOfFull) public onlyVaultOrOwner {
    uint256 currPrice = priceOracle.getPrice(fullToken);
    uint256 yieldTokenAmount = DSMath.wmul(amountOfFull, currPrice);
    _mint(account, yieldTokenAmount);
  }

  /// @dev Mint new tokens if the contract owner
  /// @param account address of account to mint tokens to
  /// @param amount amount of tokens to mint
  function mint(address account, uint256 amount) public onlyOwner {
    _mint(account, amount);
  }

  function _mint(address account, uint256 amount) private {
    require(account != address(0), "ERC20: mint to the zero address");
    // First payout any accrued yield
    _payoutYield(account);

    // Update account information with updated balance
    balances[account] = balances[account].add(amount);

    // Update the total supply
    _totalSupply = _totalSupply.add(amount);

    // A mint is effectively a transfer
    emit Transfer(address(0), account, amount);
  }

  /// @dev Returns the amount of tokens owned by `account`.
  function balanceOf(address account) public view override returns (uint256) {
    return balances[account];
  }

  /// @dev Burn tokens if the contract owner
  /// @param account address of account to burn tokens from
  /// @param amount amount of tokens to burn
  function burn(address account, uint256 amount) public onlyVaultOrOwner {
    require(account != address(0), "ERC20: burn from the zero address");

    // First payout any accrued yield
    _payoutYield(account);

    // Then update balances.
    balances[account] = balances[account].sub(amount, "ERC20: burn amount exceeds balance");

    // Update the total supply
    _totalSupply = _totalSupply.sub(amount);

    // A burn is effectively a transfer
    emit Transfer(account, address(0), amount);
  }

  /// @dev Withdraw any yield accrued to msg.sender since the last withdrawal
  function withdrawYield() public {
    _payoutYield(_msgSender());
  }

  /*
   * Override the default ERC20 imtplementations of transfer & transferFrom
   */

  /// @dev Moves `amount` tokens from the caller's account to `recipient`.
  /// @param recipient The receiver of the transfer
  /// @param amount The amount to transfer
  /// @return Returns a boolean value indicating whether the operation succeeded.
  function transfer(address recipient, uint256 amount) public override returns (bool) {
    _transfer(_msgSender(), recipient, amount);
    return true;
  }

  /// @dev Moves `amount` tokens from `sender` to `recipient` using the
  /// allowance mechanism. `amount` is then deducted from the caller's
  /// allowance.
  /// @param sender The sender of the funds being transferred
  /// @param recipient The receiver of the transfer
  /// @param amount The amount to transfer
  /// @return Returns a boolean value indicating whether the operation succeeded.
  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) public override returns (bool) {
    _transfer(sender, recipient, amount);
    _approve(
      sender,
      _msgSender(),
      _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")
    );
    return true;
  }

  function _transfer(
    address sender,
    address recipient,
    uint256 amount
  ) private {
    require(sender != address(0), "ERC20: transfer from the zero address");
    require(recipient != address(0), "ERC20: transfer to the zero address");

    _payoutYield(sender);
    _payoutYield(recipient);

    balances[sender] = balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
    balances[recipient] = balances[recipient].add(amount);

    emit Transfer(sender, recipient, amount);
  }

  /// @dev Internal yield payout function that computes the yield and transfers it to the owner
  /// @param owner Owner and recipient of the accrued yield
  function _payoutYield(address owner) private {
    uint256 lastPrice = lastPrices[owner];
    uint256 currPrice = priceOracle.getPrice(fullToken);
    // Make sure the last price is always updated when paying out yield.
    lastPrices[owner] = currPrice;
    uint256 payoutAmount = calculatePayoutAmount(owner, currPrice, lastPrice);
    if (payoutAmount == 0) {
      return;
    }
    // Call the payout function on the SplitVault contract, just for the yield
    splitVault.payout(payoutAmount, fullToken, owner);
  }

  /// @dev Simplest public method for calculating the outstanding yield for a yield token holder
  /// @param owner Owner and future recipient of the accrued yield
  /// @return The payout amount denoted in fullToken
  function calculatePayoutAmount(address owner) public view returns (uint256) {
    uint256 lastPrice = lastPrices[owner];
    uint256 currPrice = priceOracle.getPrice(fullToken);
    return calculatePayoutAmount(owner, currPrice, lastPrice);
  }

  /// @dev Public method for calculating the outstanding yield for a yield token holder and a new fullToken price
  /// @param owner Owner and future recipient of the accrued yield
  /// @param currPrice The price of fullToken to use for the calculation. Must be more than internally stored lastPrice
  /// @return The payout amount denoted in fullToken
  function calculatePayoutAmount(
    address owner,
    uint256 currPrice,
    uint256 lastPrice
  ) public view returns (uint256) {
    uint256 balance = balances[owner];
    if (balance == 0 || lastPrice == 0) {
      return 0;
    }
    uint256 payoutAmount = calculatePayoutAmount(balance, currPrice, lastPrice);
    return payoutAmount;
  }

  /// @dev Pure function for calculating the outstanding yield for a yield token holder and a new fullToken price
  /// @param balance The balance of yield component tokens for this address.
  /// @param currPrice The current price of fullToken to use for the calculation. Must be more than `lastPrice`.
  /// @param lastPrice The last price of fullToken to use for the calculation. Must be less than `currPrice`.
  /// @return The payout amount denoted in fullToken
  function calculatePayoutAmount(
    uint256 balance,
    uint256 currPrice,
    uint256 lastPrice
  ) public pure returns (uint256) {
    // Compare to old price
    uint256 priceDiff = currPrice.sub(lastPrice, "Price has decreased");
    if (priceDiff == 0) {
      return 0;
    }
    uint256 increasePercentage = DSMath.wdiv(priceDiff, lastPrice);
    uint256 payoutAmount = DSMath.wdiv(DSMath.wmul(increasePercentage, balance), currPrice);
    return payoutAmount;
  }
}

// File: contracts/VaultControlled.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/GSN/Context.sol";

import "./SplitVault.sol";

contract VaultControlled is Context {
  address private _owner;
  SplitVault internal splitVault;

  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  constructor(address splitVaultAddress) internal {
    splitVault = SplitVault(splitVaultAddress);
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

  /// @dev Throws if called by any account other than the SplitVault or Owner.
  modifier onlyVaultOrOwner() {
    require(address(splitVault) == _msgSender() || _owner == _msgSender(), "Caller is not the SplitVault or Owner");
    _;
  }

  /// @dev Returns the address of the current owner.
  function owner() public view returns (address) {
    return _owner;
  }

  /// @dev Throws if called by any account other than the owner.
  modifier onlyOwner() {
    require(_owner == _msgSender(), "Ownable: caller is not the owner");
    _;
  }

  /// @dev Leaves the contract without owner. It will not be possible to call
  /// `onlyOwner` functions anymore. Can only be called by the current owner.
  function renounceOwnership() public virtual onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
  }

  /// @dev Transfers ownership of the contract to a new account (`newOwner`).
  /// Can only be called by the current owner.
  function transferOwnership(address newOwner) public virtual onlyOwner {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

// File: contracts/lib/ERC20Base.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";

/// @dev ERC20 implementation without balances and related function implementations
abstract contract ERC20Base is IERC20, Context {
  using SafeMath for uint256;
  using Address for address;

  mapping(address => mapping(address => uint256)) internal _allowances;

  uint256 internal _totalSupply;

  string private _name;
  string private _symbol;
  uint8 private _decimals;

  /**
   * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
   * a default value of 18.
   *
   * To select a different value for {decimals}, use {_setupDecimals}.
   *
   * All three of these values are immutable: they can only be set once during
   * construction.
   */
  constructor(string memory name, string memory symbol) public {
    _name = name;
    _symbol = symbol;
    _decimals = 18;
  }

  /**
   * @dev Returns the name of the token.
   */
  function name() public view returns (string memory) {
    return _name;
  }

  /**
   * @dev Returns the symbol of the token, usually a shorter version of the
   * name.
   */
  function symbol() public view returns (string memory) {
    return _symbol;
  }

  /**
   * @dev Returns the number of decimals used to get its user representation.
   * For example, if `decimals` equals `2`, a balance of `505` tokens should
   * be displayed to a user as `5,05` (`505 / 10 ** 2`).
   *
   * Tokens usually opt for a value of 18, imitating the relationship between
   * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
   * called.
   *
   * NOTE: This information is only used for _display_ purposes: it in
   * no way affects any of the arithmetic of the contract, including
   * {IERC20-balanceOf} and {IERC20-transfer}.
   */
  function decimals() public view returns (uint8) {
    return _decimals;
  }

  /**
   * @dev See {IERC20-totalSupply}.
   */
  function totalSupply() public view override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {IERC20-balanceOf}.
   */
  function balanceOf(address account) public view virtual override returns (uint256);

  /**
   * @dev See {IERC20-transfer}.
   *
   * Requirements:
   *
   * - `recipient` cannot be the zero address.
   * - the caller must have a balance of at least `amount`.
   */
  function transfer(address recipient, uint256 amount) public virtual override returns (bool);

  /**
   * @dev See {IERC20-allowance}.
   */
  function allowance(address owner, address spender) public view virtual override returns (uint256) {
    return _allowances[owner][spender];
  }

  /**
   * @dev See {IERC20-approve}.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function approve(address spender, uint256 amount) public virtual override returns (bool) {
    _approve(_msgSender(), spender, amount);
    return true;
  }

  /**
   * @dev See {IERC20-transferFrom}.
   *
   * Emits an {Approval} event indicating the updated allowance. This is not
   * required by the EIP. See the note at the beginning of {ERC20};
   *
   * Requirements:
   * - `sender` and `recipient` cannot be the zero address.
   * - `sender` must have a balance of at least `amount`.
   * - the caller must have allowance for ``sender``'s tokens of at least
   * `amount`.
   */
  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) public virtual override returns (bool);

  /**
   * @dev Atomically increases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {IERC20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
    _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
    return true;
  }

  /**
   * @dev Atomically decreases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {IERC20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   * - `spender` must have allowance for the caller of at least
   * `subtractedValue`.
   */
  function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
    _approve(
      _msgSender(),
      spender,
      _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")
    );
    return true;
  }

  /**
   * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
   *
   * This internal function is equivalent to `approve`, and can be used to
   * e.g. set automatic allowances for certain subsystems, etc.
   *
   * Emits an {Approval} event.
   *
   * Requirements:
   *
   * - `owner` cannot be the zero address.
   * - `spender` cannot be the zero address.
   */
  function _approve(
    address owner,
    address spender,
    uint256 amount
  ) internal virtual {
    require(owner != address(0), "ERC20: approve from the zero address");
    require(spender != address(0), "ERC20: approve to the zero address");

    _allowances[owner][spender] = amount;
    emit Approval(owner, spender, amount);
  }

  /**
   * @dev Sets {decimals} to a value other than the default one of 18.
   *
   * WARNING: This function should only be called from the constructor. Most
   * applications that interact with token contracts will not expect
   * {decimals} to ever change, and may work incorrectly if it does.
   */
  function _setupDecimals(uint8 decimals_) internal {
    _decimals = decimals_;
  }

  /**
   * @dev Hook that is called before any transfer of tokens. This includes
   * minting and burning.
   *
   * Calling conditions:
   *
   * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
   * will be to transferred to `to`.
   * - when `from` is zero, `amount` tokens will be minted for `to`.
   * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
   * - `from` and `to` are never both zero.
   *
   * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
   */
  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 amount
  ) internal virtual {}
}

// File: contracts/lib/DSMath.sol



//SPDX-License-Identifier: MIT
pragma solidity >0.4.13;

library DSMath {
  function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
    require((z = x + y) >= x, "ds-math-add-overflow");
  }

  function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
    require((z = x - y) <= x, "ds-math-sub-underflow");
  }

  function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
    require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
  }

  function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
    return x <= y ? x : y;
  }

  function max(uint256 x, uint256 y) internal pure returns (uint256 z) {
    return x >= y ? x : y;
  }

  function imin(int256 x, int256 y) internal pure returns (int256 z) {
    return x <= y ? x : y;
  }

  function imax(int256 x, int256 y) internal pure returns (int256 z) {
    return x >= y ? x : y;
  }

  uint256 constant WAD = 10**18;
  uint256 constant RAY = 10**27;

  //rounds to zero if x*y < WAD / 2
  function wmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
    z = add(mul(x, y), WAD / 2) / WAD;
  }

  //rounds to zero if x*y < WAD / 2
  function rmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
    z = add(mul(x, y), RAY / 2) / RAY;
  }

  //rounds to zero if x*y < WAD / 2
  function wdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
    z = add(mul(x, WAD), y / 2) / y;
  }

  //rounds to zero if x*y < RAY / 2
  function rdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
    z = add(mul(x, RAY), y / 2) / y;
  }

  // This famous algorithm is called "exponentiation by squaring"
  // and calculates x^n with x as fixed-point and n as regular unsigned.
  //
  // It's O(log n), instead of O(n) for naive repeated multiplication.
  //
  // These facts are why it works:
  //
  //  If n is even, then x^n = (x^2)^(n/2).
  //  If n is odd,  then x^n = x * x^(n-1),
  //   and applying the equation for even x gives
  //    x^n = x * (x^2)^((n-1) / 2).
  //
  //  Also, EVM division is flooring and
  //    floor[(n-1) / 2] = floor[n / 2].
  //
  function rpow(uint256 x, uint256 n) internal pure returns (uint256 z) {
    z = n % 2 != 0 ? x : RAY;

    for (n /= 2; n != 0; n /= 2) {
      x = rmul(x, x);

      if (n % 2 != 0) {
        z = rmul(z, x);
      }
    }
  }
}

// File: contracts/CTokenPriceOracle.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

import "./interfaces/PriceOracle.sol";
import "./interfaces/CTokenInterface.sol";

contract CTokenPriceOracle is PriceOracle {
  using SafeMath for uint256;

  constructor() public {}

  /// @dev Get the exchange rate of one cToken to one underlying token in wads
  function getPrice(address cTokenAddress) external view override returns (uint256) {
    CTokenInterface cToken = CTokenInterface(cTokenAddress);
    return cToken.exchangeRateStored();
  }
}

// File: contracts/interfaces/CTokenInterface.sol



// //SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

/**
 * @dev Interface of Compound cToken
 */
interface CTokenInterface {
  /**
   * @notice Calculates the exchange rate from the underlying to the CToken
   * @return Calculated exchange rate scaled by 1e18
   */
  function exchangeRateStored() external view returns (uint256);

  function decimals() external view returns (uint256);

  function underlying() external view returns (address);
}

// File: contracts/mocks/CTokenMock.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract CTokenMock is ERC20, Ownable {
  constructor(
    string memory name,
    string memory symbol,
    uint8 decimals
  ) public ERC20(name, symbol) {
    _setupDecimals(decimals);
  }

  /// @dev Mint new tokens if the contract owner
  /// @param account address of account to mint tokens to
  /// @param amount amount of tokens to mint
  function mint(address account, uint256 amount) public onlyOwner {
    _mint(account, amount);
  }

  /// @dev Burn tokens if the contract owner
  /// @param account address of account to burn tokens from
  /// @param amount amount of tokens to burn
  function burn(address account, uint256 amount) public onlyOwner {
    _burn(account, amount);
  }

  /// @dev Burn all tokens of the account
  /// @param account address of account to burn tokens from
  function burnAll(address account) public onlyOwner {
    _burn(account, balanceOf(account));
  }
}

// File: contracts/mocks/PriceOracleMock.sol



// //SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

import "../interfaces/PriceOracle.sol";

contract PriceOracleMock is PriceOracle {
  constructor() public {}

  uint256 private price = 10**18;

  function getPrice(address token) external view override returns (uint256) {
    // make compiler happy.
    token;
    return price;
  }

  function setPrice(uint256 _price) public {
    price = _price;
  }
}

// File: contracts/mocks/SplitVaultMock.sol



// //SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;

contract SplitVaultMock {
  constructor() public {}

  struct PayoutCall {
    uint256 amount;
    address tokenAddress;
    address recipient;
  }

  PayoutCall[] public payoutCalls;

  function payout(
    uint256 amount,
    address tokenAddress,
    address recipient
  ) public {
    payoutCalls.push(PayoutCall({ amount: amount, tokenAddress: tokenAddress, recipient: recipient }));
  }

  function getPayoutCalls() public view returns (PayoutCall[] memory) {
    return payoutCalls;
  }

  function reset() public {
    delete payoutCalls;
  }
}