// File: contracts/xINCH.sol



//SPDX-License-Identifier: Unlicense
pragma solidity 0.6.2;

import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/access/Ownable.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/Initializable.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/utils/Pausable.sol";

import "./interface/IGovernanceRewards.sol";
import "./interface/IExchangeGovernance.sol";
import "./interface/IGovernanceMothership.sol";
import "./interface/IMooniswapPoolGovernance.sol";
import "./interface/IMooniswapFactoryGovernance.sol";
import "./interface/IOneInchLiquidityProtocol.sol";

contract xINCH is
    Initializable,
    ERC20UpgradeSafe,
    OwnableUpgradeSafe,
    PausableUpgradeSafe
{
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    uint256 private constant LIQUIDATION_TIME_PERIOD = 4 weeks;
    uint256 private constant INITIAL_SUPPLY_MULTIPLIER = 10;
    uint256 private constant BUFFER_TARGET = 20; // 5% target
    uint256 private constant MAX_UINT = 2**256 - 1;

    uint256 public adminActiveTimestamp;
    uint256 public withdrawableOneInchFees;

    IERC20 private oneInch;

    IOneInchLiquidityProtocol private oneInchLiquidityProtocol;
    IMooniswapFactoryGovernance private factoryGovernance;
    IGovernanceMothership private governanceMothership;
    IExchangeGovernance private exchangeGovernance;
    IGovernanceRewards private governanceRewards;

    address private oneInchExchange;

    address private manager;
    address private manager2;

    address private constant ETH_ADDRESS = address(0);

    struct FeeDivisors {
        uint256 mintFee;
        uint256 burnFee;
        uint256 claimFee;
    }

    FeeDivisors public feeDivisors;

    string public mandate;
    
    // addresses are locked from transfer after minting or burning
    uint256 private constant BLOCK_LOCK_COUNT = 6;
    // last block for which this address is timelocked
    mapping(address => uint256) public lastLockedBlock;

    event Rebalance();
    event FeeDivisorsSet(uint256 mintFee, uint256 burnFee, uint256 claimFee);
    event FeeWithdraw(uint256 ethFee, uint256 inchFee);

    function initialize(
        string calldata _symbol,
        string calldata _mandate,
        IERC20 _oneInch,
        IGovernanceMothership _governanceMothership,
        IOneInchLiquidityProtocol _oneInchLiquidityProtocol,
        uint256 _mintFeeDivisor,
        uint256 _burnFeeDivisor,
        uint256 _claimFeeDivisor
    ) external initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
        __ERC20_init_unchained("xINCH", _symbol);

        mandate = _mandate;

        oneInch = _oneInch;
        governanceMothership = _governanceMothership;
        oneInchLiquidityProtocol = _oneInchLiquidityProtocol;

        _setFeeDivisors(_mintFeeDivisor, _burnFeeDivisor, _claimFeeDivisor);
    }

    /*
     * @dev Mint xINCH using ETH
     * @param minReturn: Min return to pass to 1Inch trade
     */
    function mint(uint256 minReturn)
        external
        payable
        whenNotPaused
        notLocked(msg.sender)
    {
        require(msg.value > 0, "Must send ETH");
        lock(msg.sender);

        uint256 fee = _calculateFee(msg.value, feeDivisors.mintFee);
        uint256 ethValue = msg.value.sub(fee);
        uint256 bufferBalanceBefore = getBufferBalance();
        oneInchLiquidityProtocol.swap.value(ethValue)(
            ETH_ADDRESS,
            address(oneInch),
            ethValue,
            minReturn,
            address(0)
        );

        _mintInternal(getBufferBalance().sub(bufferBalanceBefore));
    }

    /*
     * @dev Mint xINCH using INCH
     * @param oneInchAmount: INCH tokens to contribute
     */
    function mintWithToken(uint256 oneInchAmount)
        external
        whenNotPaused
        notLocked(msg.sender)
    {
        require(oneInchAmount > 0, "Must send token");
        lock(msg.sender);
        oneInch.safeTransferFrom(msg.sender, address(this), oneInchAmount);

        uint256 fee = _calculateFee(oneInchAmount, feeDivisors.mintFee);
        _incrementWithdrawableOneInchFees(fee);

        return _mintInternal(oneInchAmount.sub(fee));
    }

    function _mintInternal(uint256 _incrementalOneInch) private {
        uint256 mintAmount =
            calculateMintAmount(_incrementalOneInch, totalSupply());

        return super._mint(msg.sender, mintAmount);
    }

    function calculateMintAmount(
        uint256 incrementalOneInch,
        uint256 totalSupply
    ) public view returns (uint256 mintAmount) {
        if (totalSupply == 0)
            return incrementalOneInch.mul(INITIAL_SUPPLY_MULTIPLIER);
        uint256 previousNav = getNav().sub(incrementalOneInch);
        mintAmount = (incrementalOneInch).mul(totalSupply).div(previousNav);
    }

    /*
     * @dev Burn xINCH tokens
     * @notice Will fail if pro rata balance exceeds available liquidity
     * @param tokenAmount: xINCH tokens to burn
     * @param redeemForEth: Redeem for ETH or INCH
     * @param minReturn: Min return to pass to 1Inch trade
     */
    function burn(
        uint256 tokenAmount,
        bool redeemForEth,
        uint256 minReturn
    ) external notLocked(msg.sender) {
        require(tokenAmount > 0, "Must send xINCH");
        lock(msg.sender);

        uint256 stakedBalance = getStakedBalance();
        uint256 bufferBalance = getBufferBalance();
        uint256 inchHoldings = stakedBalance.add(bufferBalance);
        uint256 proRataInch = inchHoldings.mul(tokenAmount).div(totalSupply());

        require(proRataInch <= bufferBalance, "Insufficient exit liquidity");
        super._burn(msg.sender, tokenAmount);

        if (redeemForEth) {
            uint256 fee = _calculateFee(proRataInch, feeDivisors.burnFee);
            _incrementWithdrawableOneInchFees(fee);
            oneInchLiquidityProtocol.swapFor(
                address(oneInch),
                ETH_ADDRESS,
                proRataInch.sub(fee),
                minReturn,
                address(0),
                msg.sender
            );
        } else {
            uint256 fee = _calculateFee(proRataInch, feeDivisors.burnFee);
            _incrementWithdrawableOneInchFees(fee);
            oneInch.safeTransfer(msg.sender, proRataInch.sub(fee));
        }
    }

    function transfer(address recipient, uint256 amount)
        public
        override
        notLocked(msg.sender)
        returns (bool)
    {
        return super.transfer(recipient, amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override notLocked(sender) returns (bool) {
        return super.transferFrom(sender, recipient, amount);
    }

    /* ========================================================================================= */
    /*                                            Management                                     */
    /* ========================================================================================= */

    function getNav() public view returns (uint256) {
        return getStakedBalance().add(getBufferBalance());
    }

    function getStakedBalance() public view returns (uint256) {
        return IERC20(address(governanceMothership)).balanceOf(address(this));
    }

    function getBufferBalance() public view returns (uint256) {
        return oneInch.balanceOf(address(this)).sub(withdrawableOneInchFees);
    }

    /*
     * @dev Admin function for claiming INCH rewards
     */
    function getReward() external onlyOwnerOrManager {
        _certifyAdmin();
        _getReward();
    }

    /*
     * @dev Public callable function for claiming INCH rewards
     */
    function getRewardExternal() external {
        _getReward();
    }

    function _getReward() private {
        uint256 bufferBalanceBefore = getBufferBalance();
        governanceRewards.getReward();

        uint256 bufferBalanceAfter = getBufferBalance();
        uint256 fee =
            _calculateFee(
                bufferBalanceAfter.sub(bufferBalanceBefore),
                feeDivisors.claimFee
            );
        _incrementWithdrawableOneInchFees(fee);
    }

    function _stake(uint256 _amount) private {
        governanceMothership.stake(_amount);
    }

    /*
     * @dev Admin function for unstaking beyond the scope of a rebalance
     */
    function adminUnstake(uint256 _amount) external onlyOwnerOrManager {
        _unstake(_amount);
    }

    /*
     * @dev Public callable function for unstaking in event of admin failure/incapacitation
     */
    function emergencyUnstake(uint256 _amount) external {
        require(
            adminActiveTimestamp.add(LIQUIDATION_TIME_PERIOD) < block.timestamp,
            "Liquidation time not elapsed"
        );
        _unstake(_amount);
    }

    function unstake(uint256 _amount) external onlyOwnerOrManager {
        _unstake(_amount);
    }

    function _unstake(uint256 _amount) private {
        governanceMothership.unstake(_amount);
    }

    /*
     * @dev Admin function for collecting reward and restoring target buffer balance
     */
    function rebalance() external onlyOwnerOrManager {
        _certifyAdmin();
        _getReward();
        _rebalance();
    }

    /*
     * @dev Public callable function for collecting reward and restoring target buffer balance
     */
    function rebalanceExternal() external {
        require(
            adminActiveTimestamp.add(LIQUIDATION_TIME_PERIOD) > block.timestamp,
            "Liquidation time elapsed; no more staking"
        );
        _getReward();
        _rebalance();
    }

    function _rebalance() private {
        uint256 stakedBalance = getStakedBalance();
        uint256 bufferBalance = getBufferBalance();
        uint256 targetBuffer =
            (stakedBalance.add(bufferBalance)).div(BUFFER_TARGET);

        if (bufferBalance > targetBuffer) {
            _stake(bufferBalance.sub(targetBuffer));
        } else {
            _unstake(targetBuffer.sub(bufferBalance));
        }

        emit Rebalance();
    }

    function _calculateFee(uint256 _value, uint256 _feeDivisor)
        internal
        pure
        returns (uint256 fee)
    {
        if (_feeDivisor > 0) {
            fee = _value.div(_feeDivisor);
        }
    }

    function _incrementWithdrawableOneInchFees(uint256 _feeAmount) private {
        withdrawableOneInchFees = withdrawableOneInchFees.add(_feeAmount);
    }

    /* ========================================================================================= */
    /*                                          Governance                                       */
    /* ========================================================================================= */

    function setFactoryGovernanceAddress(
        IMooniswapFactoryGovernance _factoryGovernance
    ) external onlyOwnerOrManager {
        factoryGovernance = _factoryGovernance;
    }

    function setGovernanceRewardsAddress(IGovernanceRewards _governanceRewards)
        external
        onlyOwnerOrManager
    {
        governanceRewards = _governanceRewards;
    }

    function setExchangeGovernanceAddress(
        IExchangeGovernance _exchangeGovernance
    ) external onlyOwnerOrManager {
        exchangeGovernance = _exchangeGovernance;
    }

    function defaultDecayPeriodVote(uint256 vote) external onlyOwnerOrManager {
        factoryGovernance.defaultDecayPeriodVote(vote);
    }

    function defaultFeeVote(uint256 vote) external onlyOwnerOrManager {
        factoryGovernance.defaultFeeVote(vote);
    }

    function defaultSlippageFeeVote(uint256 vote) external onlyOwnerOrManager {
        factoryGovernance.defaultSlippageFeeVote(vote);
    }

    function governanceShareVote(uint256 vote) external onlyOwnerOrManager {
        factoryGovernance.governanceShareVote(vote);
    }

    function referralShareVote(uint256 vote) external onlyOwnerOrManager {
        factoryGovernance.referralShareVote(vote);
    }

    function leftoverShareVote(uint256 govShare, uint256 refShare)
        external
        onlyOwnerOrManager
    {
        exchangeGovernance.leftoverShareVote(govShare, refShare);
    }

    function poolFeeVote(address pool, uint256 vote)
        external
        onlyOwnerOrManager
    {
        IMooniswapPoolGovernance(pool).feeVote(vote);
    }

    function poolSlippageFeeVote(address pool, uint256 vote)
        external
        onlyOwnerOrManager
    {
        IMooniswapPoolGovernance(pool).slippageFeeVote(vote);
    }

    function poolDecayPeriodVote(address pool, uint256 vote)
        external
        onlyOwnerOrManager
    {
        IMooniswapPoolGovernance(pool).decayPeriodVote(vote);
    }

    /* ========================================================================================= */
    /*                                              Utils                                        */
    /* ========================================================================================= */

    /*
     * @notice Inverse of fee i.e., a fee divisor of 100 == 1%
     * @notice Three fee types
     * @dev Mint fee 0 or <= 2%
     * @dev Burn fee 0 or <= 1%
     * @dev Claim fee 0 <= 4%
     */
    function setFeeDivisors(
        uint256 mintFeeDivisor,
        uint256 burnFeeDivisor,
        uint256 claimFeeDivisor
    ) public onlyOwner {
        _setFeeDivisors(mintFeeDivisor, burnFeeDivisor, claimFeeDivisor);
    }

    function _setFeeDivisors(
        uint256 _mintFeeDivisor,
        uint256 _burnFeeDivisor,
        uint256 _claimFeeDivisor
    ) private {
        require(_mintFeeDivisor == 0 || _mintFeeDivisor >= 50, "Invalid fee");
        require(_burnFeeDivisor == 0 || _burnFeeDivisor >= 100, "Invalid fee");
        require(_claimFeeDivisor >= 25, "Invalid fee");
        feeDivisors.mintFee = _mintFeeDivisor;
        feeDivisors.burnFee = _burnFeeDivisor;
        feeDivisors.claimFee = _claimFeeDivisor;

        emit FeeDivisorsSet(_mintFeeDivisor, _burnFeeDivisor, _claimFeeDivisor);
    }

    function pauseContract() public onlyOwnerOrManager returns (bool) {
        _pause();
        return true;
    }

    function unpauseContract() public onlyOwnerOrManager returns (bool) {
        _unpause();
        return true;
    }

    /*
     * @notice Registers that admin is present and active
     * @notice If admin isn't certified within liquidation time period,
     * emergencyUnstake function becomes callable
     */
    function _certifyAdmin() private {
        adminActiveTimestamp = block.timestamp;
    }

    function setManager(address _manager) external onlyOwner {
        manager = _manager;
    }

    function setManager2(address _manager2) external onlyOwner {
        manager2 = _manager2;
    }

    function approveInch(address _toApprove) external onlyOwnerOrManager {
        require(_toApprove == address(oneInchLiquidityProtocol) || _toApprove == address(governanceMothership));
        oneInch.safeApprove(_toApprove, MAX_UINT);
    }

    /*
     * @notice Emergency function in case of errant transfer of
     * xINCH token directly to contract
     */
    function withdrawNativeToken() public onlyOwnerOrManager {
        uint256 tokenBal = balanceOf(address(this));
        if (tokenBal > 0) {
            IERC20(address(this)).safeTransfer(msg.sender, tokenBal);
        }
    }

    /*
     * @notice Withdraw function for ETH and INCH fees
     */
    function withdrawFees() public onlyOwner {
        uint256 ethBal = address(this).balance;
        (bool success, ) = msg.sender.call.value(ethBal)("");
        require(success, "Transfer failed");

        uint256 oneInchFees = withdrawableOneInchFees;
        withdrawableOneInchFees = 0;
        oneInch.safeTransfer(msg.sender, oneInchFees);

        emit FeeWithdraw(ethBal, oneInchFees);
    }

    modifier onlyOwnerOrManager {
        require(
            msg.sender == owner() ||
                msg.sender == manager ||
                msg.sender == manager2,
            "Non-admin caller"
        );
        _;
    }

    /**
     *  BlockLock logic: Implements locking of mint, burn, transfer and transferFrom
     *  functions via a notLocked modifier.
     *  Functions are locked per address.
     */
    modifier notLocked(address lockedAddress) {
        require(
            lastLockedBlock[lockedAddress] <= block.number,
            "Function is temporarily locked for this address"
        );
        _;
    }

    /**
     * @dev Lock mint, burn, transfer and transferFrom functions
     *      for _address for BLOCK_LOCK_COUNT blocks
     */
    function lock(address _address) private {
        lastLockedBlock[_address] = block.number + BLOCK_LOCK_COUNT;
    }

    receive() external payable {
        require(msg.sender != tx.origin, "Errant ETH deposit");
    }
}

// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/SafeERC20.sol



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 ERC20;` 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));
    }

    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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}

// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20.sol



pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
import "../../Initializable.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 {ERC20MinterPauser}.
 *
 * 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 ERC20UpgradeSafe is Initializable, ContextUpgradeSafe, 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.
     */

    function __ERC20_init(string memory name, string memory symbol) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name, symbol);
    }

    function __ERC20_init_unchained(string memory name, string memory symbol) internal initializer {


        _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 is 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 { }

    uint256[44] private __gap;
}

// File: @openzeppelin/contracts-ethereum-package/contracts/access/Ownable.sol



pragma solidity ^0.6.0;

import "../GSN/Context.sol";
import "../Initializable.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 OwnableUpgradeSafe is Initializable, ContextUpgradeSafe {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */

    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {


        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;
    }

    uint256[49] private __gap;
}

// File: @openzeppelin/contracts-ethereum-package/contracts/Initializable.sol



pragma solidity >=0.4.24 <0.7.0;


/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
contract Initializable {

  /**
   * @dev Indicates that the contract has been initialized.
   */
  bool private initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private initializing;

  /**
   * @dev Modifier to use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");

    bool isTopLevelCall = !initializing;
    if (isTopLevelCall) {
      initializing = true;
      initialized = true;
    }

    _;

    if (isTopLevelCall) {
      initializing = false;
    }
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    address self = address(this);
    uint256 cs;
    assembly { cs := extcodesize(self) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

// File: @openzeppelin/contracts-ethereum-package/contracts/utils/Pausable.sol



pragma solidity ^0.6.0;

import "../GSN/Context.sol";
import "../Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract PausableUpgradeSafe is Initializable, ContextUpgradeSafe {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */

    function __Pausable_init() internal initializer {
        __Context_init_unchained();
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal initializer {


        _paused = false;

    }


    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

    uint256[49] private __gap;
}

// File: contracts/interface/IGovernanceRewards.sol



pragma solidity 0.6.2;

// https://etherscan.io/address/0x0f85a912448279111694f4ba4f85dc641c54b594#writeContract
interface IGovernanceRewards {
    function getReward() external;
    function earned(address account) external view returns (uint256);
}
// File: contracts/interface/IExchangeGovernance.sol



pragma solidity 0.6.2;

interface IExchangeGovernance {
    function leftoverShareVote(uint256 govShare, uint256 refShare) external;
}
// File: contracts/interface/IGovernanceMothership.sol



pragma solidity 0.6.2;

interface IGovernanceMothership {
    function stake(uint256 amount) external;
    function unstake(uint256 amount) external;
    function notify() external;
}
// File: contracts/interface/IMooniswapPoolGovernance.sol



pragma solidity 0.6.2;

interface IMooniswapPoolGovernance {
    function feeVote(uint256 vote) external;
    function slippageFeeVote(uint256 vote) external;
    function decayPeriodVote(uint256 vote) external;
}
// File: contracts/interface/IMooniswapFactoryGovernance.sol



pragma solidity 0.6.2;

// https://etherscan.io/address/0xc4a8b7e29e3c8ec560cd4945c1cf3461a85a148d#code
interface IMooniswapFactoryGovernance {
    function defaultDecayPeriodVote(uint256 vote) external;
    function defaultFeeVote(uint256 vote) external;
    function defaultSlippageFeeVote(uint256 vote) external;
    function governanceShareVote(uint256 vote) external;
    function referralShareVote(uint256 vote) external;
}
// File: contracts/interface/IOneInchLiquidityProtocol.sol



pragma solidity ^0.6.0;


interface IOneInchLiquidityProtocol {
    function swap(address src, address dst, uint256 amount, uint256 minReturn, address referral) external payable returns(uint256 result);

    function swapFor(address src, address dst, uint256 amount, uint256 minReturn, address referral, address payable receiver) external payable returns(uint256 result);

}
// File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol



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-ethereum-package/contracts/math/SafeMath.sol



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) {
        // Solidity only automatically asserts when dividing by 0
        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-ethereum-package/contracts/utils/Address.sol



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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @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");
    }
}

// File: @openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol



pragma solidity ^0.6.0;
import "../Initializable.sol";

/*
 * @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.
 */
contract ContextUpgradeSafe is Initializable {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.

    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {


    }


    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;
    }

    uint256[50] private __gap;
}