// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/SafeMath.sol";
import "./lib/Address.sol";
import "./lib/SafeERC20.sol";
import "./OwnableManagement.sol";
import "./lib/IERC20.sol";
import "./lib/ISyncus.sol";
import "./lib/IVESYNC.sol";
import "./lib/IDistributor.sol";
import "./lib/IWarmup.sol";
contract SyncusStaking is OwnableManagement {
    using SafeMath for uint256;
    using SafeMath for uint32;
    using SafeERC20 for IERC20;
    address public immutable Sync;
    address public immutable veSync;
    struct Epoch {
        uint number;
        uint distribute;
        uint32 length;
        uint32 endTime;
    }
    Epoch public epoch;
    address public distributor;
    address public locker;
    uint public totalBonus;
    address public warmupContract;
    uint public warmupPeriod;
    address taxReceiver;
    uint public taxOnStake = 250; // 2.5%
    uint public taxOnUnstake = 250; // 2.5%
    function setTaxOnStake(uint _taxOnStake) external onlyManager {
        require(_taxOnStake <= 10000, "Tax cannot be greater than 100%");
        taxOnStake = _taxOnStake;
    }
    function setTaxOnUnstake(uint _taxOnUnstake) external onlyManager {
        require(_taxOnUnstake <= 10000, "Tax cannot be greater than 100%");
        taxOnUnstake = _taxOnUnstake;
    }
    function setTaxReceiver(address _taxReceiver) external onlyManager {
        taxReceiver = _taxReceiver;
    }
    modifier onlyDistributor() {
        require(msg.sender == distributor, "Only distributor");
        _;
    }
    constructor(
        address _Sync,
        address _veSync,
        uint32 _epochLength,
        uint _firstEpochNumber,
        uint32 _firstEpochTime,
        address _taxReceiver
    ) {
        require(_Sync != address(0));
        Sync = _Sync;
        require(_veSync != address(0));
        veSync = _veSync;
        epoch = Epoch({
            length: _epochLength,
            number: _firstEpochNumber,
            endTime: _firstEpochTime,
            distribute: 0
        });
        taxReceiver = _taxReceiver;
    }
    struct Claim {
        uint deposit;
        uint gons;
        uint expiry;
        bool lock; // prevents malicious delays
    }
    mapping(address => Claim) public warmupInfo;
    /**
        @notice stake SYNC to enter warmup
        @param _amount uint
        @return bool
     */
    function stake(uint _amount, address _recipient) external returns (bool) {
        rebase();
        uint tax = _amount.mul(taxOnStake).div(10000);
        uint amountAfterTax = _amount.sub(tax);
        IERC20(Sync).safeTransferFrom(
            msg.sender,
            address(this),
            amountAfterTax
        );
        IERC20(Sync).safeTransferFrom(msg.sender, taxReceiver, tax);
        Claim memory info = warmupInfo[_recipient];
        require(!info.lock, "Deposits for account are locked");
        warmupInfo[_recipient] = Claim({
            deposit: info.deposit.add(amountAfterTax),
            gons: info.gons.add(IVESYNC(veSync).gonsForBalance(amountAfterTax)),
            expiry: epoch.number.add(warmupPeriod),
            lock: false
        });
        IERC20(veSync).safeTransfer(warmupContract, amountAfterTax);
        return true;
    }
    /**
        @notice retrieve veSYNC from warmup
        @param _recipient address
     */
    function claim(address _recipient) public {
        Claim memory info = warmupInfo[_recipient];
        if (epoch.number >= info.expiry && info.expiry != 0) {
            delete warmupInfo[_recipient];
            IWarmup(warmupContract).retrieve(
                _recipient,
                IVESYNC(veSync).balanceForGons(info.gons)
            );
        }
    }
    /**
        @notice forfeit veSYNC in warmup and retrieve SYNC
     */
    function forfeit() external {
        Claim memory info = warmupInfo[msg.sender];
        delete warmupInfo[msg.sender];
        IWarmup(warmupContract).retrieve(
            address(this),
            IVESYNC(veSync).balanceForGons(info.gons)
        );
        IERC20(Sync).safeTransfer(msg.sender, info.deposit);
    }
    /**
        @notice prevent new deposits to address (protection from malicious activity)
     */
    function toggleDepositLock() external {
        warmupInfo[msg.sender].lock = !warmupInfo[msg.sender].lock;
    }
    /**
        @notice redeem veSYNC for SYNC
        @param _amount uint
        @param _trigger bool
     */
    function unstake(uint _amount, bool _trigger) external {
        if (_trigger) {
            rebase();
        }
        IERC20(veSync).safeTransferFrom(msg.sender, address(this), _amount);
        uint tax = _amount.mul(taxOnUnstake).div(10000);
        uint amountAfterTax = _amount.sub(tax);
        IERC20(Sync).safeTransfer(msg.sender, amountAfterTax);
        IERC20(Sync).safeTransfer(taxReceiver, tax);
    }
    /**
        @notice returns the veSYNC index, which tracks rebase growth
        @return uint
     */
    function index() public view returns (uint) {
        return IVESYNC(veSync).index();
    }
    /**
        @notice trigger rebase if epoch over
     */
    function rebase() public {
        if (epoch.endTime <= uint32(block.timestamp)) {
            IVESYNC(veSync).rebase(epoch.distribute, epoch.number);
            epoch.endTime = epoch.endTime.add32(epoch.length);
            epoch.number++;
            if (distributor != address(0)) {
                IDistributor(distributor).distribute();
            }
            uint balance = contractBalance();
            uint staked = IVESYNC(veSync).circulatingSupply();
            if (balance <= staked) {
                epoch.distribute = 0;
            } else {
                epoch.distribute = balance.sub(staked);
            }
        }
    }
    /**
        @notice returns contract SYNC holdings, including bonuses provided
        @return uint
     */
    function contractBalance() public view returns (uint) {
        return IERC20(Sync).balanceOf(address(this)).add(totalBonus);
    }
    /**
        @notice provide bonus to locked staking contract
        @param _amount uint
     */
    function giveLockBonus(uint _amount) external {
        require(msg.sender == locker);
        totalBonus = totalBonus.add(_amount);
        IERC20(veSync).safeTransfer(locker, _amount);
    }
    /**
        @notice reclaim bonus from locked staking contract
        @param _amount uint
     */
    function returnLockBonus(uint _amount) external {
        require(msg.sender == locker);
        totalBonus = totalBonus.sub(_amount);
        IERC20(veSync).safeTransferFrom(locker, address(this), _amount);
    }
    enum CONTRACTS {
        DISTRIBUTOR,
        WARMUP,
        LOCKER
    }
    /**
        @notice sets the contract address for LP staking
        @param _contract address
     */
    function setContract(
        CONTRACTS _contract,
        address _address
    ) external onlyManager {
        if (_contract == CONTRACTS.DISTRIBUTOR) {
            // 0
            distributor = _address;
        } else if (_contract == CONTRACTS.WARMUP) {
            // 1
            require(
                warmupContract == address(0),
                "Warmup cannot be set more than once"
            );
            warmupContract = _address;
        } else if (_contract == CONTRACTS.LOCKER) {
            // 2
            require(
                locker == address(0),
                "Locker cannot be set more than once"
            );
            locker = _address;
        }
    }
    /**
     * @notice set warmup period in epoch's numbers for new stakers
     * @param _warmupPeriod uint
     */
    function setWarmup(uint _warmupPeriod) external onlyManager {
        warmupPeriod = _warmupPeriod;
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function add32(uint32 a, uint32 b) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    function sub32(uint32 a, uint32 b) internal pure returns (uint32) {
        return sub32(a, b, "SafeMath: subtraction overflow");
    }
    function sub32(
        uint32 a,
        uint32 b,
        string memory errorMessage
    ) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        uint32 c = a - b;
        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function mul32(uint32 a, uint32 b) internal pure returns (uint32) {
        if (a == 0) {
            return 0;
        }
        uint32 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by 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;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add(div(a, 2), 1);
            while (b < c) {
                c = b;
                b = div(add(div(a, b), b), 2);
            }
        } else if (a != 0) {
            c = 1;
        }
    }
    function percentageAmount(
        uint256 total_,
        uint8 percentage_
    ) internal pure returns (uint256 percentAmount_) {
        return div(mul(total_, percentage_), 1000);
    }
    function substractPercentage(
        uint256 total_,
        uint8 percentageToSub_
    ) internal pure returns (uint256 result_) {
        return sub(total_, div(mul(total_, percentageToSub_), 1000));
    }
    function percentageOfTotal(
        uint256 part_,
        uint256 total_
    ) internal pure returns (uint256 percent_) {
        return div(mul(part_, 100), total_);
    }
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
    }
    function quadraticPricing(
        uint256 payment_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return sqrrt(mul(multiplier_, payment_));
    }
    function bondingCurve(
        uint256 supply_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return mul(multiplier_, supply_);
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
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}
     */
    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).
     *
     * 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"
        );
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return _verifyCallResult(success, returndata, 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);
            }
        }
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data
    ) internal view returns (bytes memory) {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(
        address target,
        bytes memory data
    ) internal returns (bytes memory) {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        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);
            }
        }
    }
    function addressToString(
        address _address
    ) internal pure returns (string memory) {
        bytes32 _bytes = bytes32(uint256(_address));
        bytes memory HEX = "0123456789abcdef";
        bytes memory _addr = new bytes(42);
        _addr[0] = "0";
        _addr[1] = "x";
        for (uint256 i = 0; i < 20; i++) {
            _addr[2 + i * 2] = HEX[uint8(_bytes[i + 12] >> 4)];
            _addr[3 + i * 2] = HEX[uint8(_bytes[i + 12] & 0x0f)];
        }
        return string(_addr);
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./SafeMath.sol";
import "./Address.sol";
import "./IERC20.sol";
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");
        }
    }
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IOwnableManagement.sol";
contract OwnableManagement is IOwnableManagement {
      address internal _owner;
    address internal _newOwner;
    event OwnershipPushed(address indexed previousOwner, address indexed newOwner);
    event OwnershipPulled(address indexed previousOwner, address indexed newOwner);
    constructor () {
        _owner = msg.sender;
        emit OwnershipPushed( address(0), _owner );
    }
    function manager() public view override returns (address) {
        return _owner;
    }
    modifier onlyManager() {
        require( _owner == msg.sender, "Ownable: caller is not the owner" );
        _;
    }
    function renounceManagement() public virtual override onlyManager() {
        emit OwnershipPushed( _owner, address(0) );
        _owner = address(0);
    }
    function pushManagement( address newOwner_ ) public virtual override onlyManager() {
        require( newOwner_ != address(0), "Ownable: new owner is the zero address");
        emit OwnershipPushed( _owner, newOwner_ );
        _newOwner = newOwner_;
    }
    
    function pullManagement() public virtual override {
        require( msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled( _owner, _newOwner );
        _owner = _newOwner;
    }
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IERC20 {
    function decimals() external view returns (uint8);
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface ISyncus {
    function burn(uint256 amount) external;
    function burnFrom(address account_, uint256 amount_) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IVESYNC {
    function rebase( uint256 ohmProfit_, uint epoch_) external returns (uint256);
    function circulatingSupply() external view returns (uint256);
    function balanceOf(address who) external view returns (uint256);
    function gonsForBalance( uint amount ) external view returns ( uint );
    function balanceForGons( uint gons ) external view returns ( uint );
    
    function index() external view returns ( uint );
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IDistributor {
    function nextRewardAt(uint _rate) external view returns (uint);
    function nextRewardFor(address _recipient) external view returns (uint);
    function distribute() external returns (bool);
    function addRecipient(address _recipient, uint _rewardRate) external;
    function removeRecipient(uint _index, address _recipient) external;
    function setAdjustment(
        uint _index,
        bool _add,
        uint _rate,
        uint _target
    ) external;
    function updateCurrentRate(uint _index, uint _rate) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IWarmup {
    function retrieve( address staker_, uint amount_ ) external;
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IOwnableManagement {
    function manager() external view returns (address);
    function renounceManagement() external;
    function pushManagement(address newOwner_) external;
    function pullManagement() external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./ERC20Permit.sol";
import "./lib/IOwnable.sol";
import "./OwnableManagement.sol";
contract veSYNC is ERC20Permit, OwnableManagement {
    using SafeMath for uint256;
    modifier onlyStakingContract() {
        require(msg.sender == stakingContract);
        _;
    }
    address public stakingContract;
    address public initializer;
    event LogSupply(
        uint256 indexed epoch,
        uint256 timestamp,
        uint256 totalSupply
    );
    event LogRebase(uint256 indexed epoch, uint256 rebase, uint256 index);
    event LogStakingContractUpdated(address stakingContract);
    struct Rebase {
        uint epoch;
        uint rebase; // 18 decimals
        uint totalStakedBefore;
        uint totalStakedAfter;
        uint amountRebased;
        uint index;
        uint32 timeOccured;
    }
    Rebase[] public rebases;
    uint public INDEX;
    uint256 private constant MAX_UINT256 = ~uint256(0);
    uint256 private constant INITIAL_FRAGMENTS_SUPPLY =
        5_000_000_000_000 * 10 ** 9;
    // TOTAL_GONS is a multiple of INITIAL_FRAGMENTS_SUPPLY so that _gonsPerFragment is an integer.
    // Use the highest value that fits in a uint256 for max granularity.
    uint256 private constant TOTAL_GONS =
        MAX_UINT256 - (MAX_UINT256 % INITIAL_FRAGMENTS_SUPPLY);
    // MAX_SUPPLY = maximum integer < (sqrt(4*TOTAL_GONS + 1) - 1) / 2
    uint256 private constant MAX_SUPPLY = ~uint128(0); // (2^128) - 1
    uint256 private _gonsPerFragment;
    mapping(address => uint256) private _gonBalances;
    mapping(address => mapping(address => uint256)) private _allowedValue;
    constructor() ERC20("Vote-escrowed SYNC", "veSYNC", 9) ERC20Permit() {
        initializer = msg.sender;
        _totalSupply = INITIAL_FRAGMENTS_SUPPLY;
        _gonsPerFragment = TOTAL_GONS.div(_totalSupply);
    }
    function initialize(address stakingContract_) external returns (bool) {
        require(msg.sender == initializer);
        require(stakingContract_ != address(0));
        stakingContract = stakingContract_;
        _gonBalances[stakingContract] = TOTAL_GONS;
        emit Transfer(address(0x0), stakingContract, _totalSupply);
        emit LogStakingContractUpdated(stakingContract_);
        initializer = address(0);
        return true;
    }
    function setIndex(uint _INDEX) external onlyManager returns (bool) {
        require(INDEX == 0);
        INDEX = gonsForBalance(_INDEX);
        return true;
    }
    /**
        @notice increases veSYNC supply to increase staking balances relative to profit_
        @param profit_ uint256
        @return uint256
     */
    function rebase(
        uint256 profit_,
        uint epoch_
    ) public onlyStakingContract returns (uint256) {
        uint256 rebaseAmount;
        uint256 circulatingSupply_ = circulatingSupply();
        if (profit_ == 0) {
            emit LogSupply(epoch_, block.timestamp, _totalSupply);
            emit LogRebase(epoch_, 0, index());
            return _totalSupply;
        } else if (circulatingSupply_ > 0) {
            rebaseAmount = profit_.mul(_totalSupply).div(circulatingSupply_);
        } else {
            rebaseAmount = profit_;
        }
        _totalSupply = _totalSupply.add(rebaseAmount);
        if (_totalSupply > MAX_SUPPLY) {
            _totalSupply = MAX_SUPPLY;
        }
        _gonsPerFragment = TOTAL_GONS.div(_totalSupply);
        _storeRebase(circulatingSupply_, profit_, epoch_);
        return _totalSupply;
    }
    /**
        @notice emits event with data about rebase
        @param previousCirculating_ uint
        @param profit_ uint
        @param epoch_ uint
        @return bool
     */
    function _storeRebase(
        uint previousCirculating_,
        uint profit_,
        uint epoch_
    ) internal returns (bool) {
        uint rebasePercent = profit_.mul(1e18).div(previousCirculating_);
        rebases.push(
            Rebase({
                epoch: epoch_,
                rebase: rebasePercent, // 18 decimals
                totalStakedBefore: previousCirculating_,
                totalStakedAfter: circulatingSupply(),
                amountRebased: profit_,
                index: index(),
                timeOccured: uint32(block.timestamp)
            })
        );
        emit LogSupply(epoch_, block.timestamp, _totalSupply);
        emit LogRebase(epoch_, rebasePercent, index());
        return true;
    }
    function balanceOf(address who) public view override returns (uint256) {
        return _gonBalances[who].div(_gonsPerFragment);
    }
    function gonsForBalance(uint amount) public view returns (uint) {
        return amount.mul(_gonsPerFragment);
    }
    function balanceForGons(uint gons) public view returns (uint) {
        return gons.div(_gonsPerFragment);
    }
    // Staking contract holds excess veSYNC
    function circulatingSupply() public view returns (uint) {
        return _totalSupply.sub(balanceOf(stakingContract));
    }
    function index() public view returns (uint) {
        return balanceForGons(INDEX);
    }
    function transfer(
        address to,
        uint256 value
    ) public override returns (bool) {
        uint256 gonValue = value.mul(_gonsPerFragment);
        _gonBalances[msg.sender] = _gonBalances[msg.sender].sub(gonValue);
        _gonBalances[to] = _gonBalances[to].add(gonValue);
        emit Transfer(msg.sender, to, value);
        return true;
    }
    function allowance(
        address owner_,
        address spender
    ) public view override returns (uint256) {
        return _allowedValue[owner_][spender];
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) public override returns (bool) {
        _allowedValue[from][msg.sender] = _allowedValue[from][msg.sender].sub(
            value
        );
        emit Approval(from, msg.sender, _allowedValue[from][msg.sender]);
        uint256 gonValue = gonsForBalance(value);
        _gonBalances[from] = _gonBalances[from].sub(gonValue);
        _gonBalances[to] = _gonBalances[to].add(gonValue);
        emit Transfer(from, to, value);
        return true;
    }
    function approve(
        address spender,
        uint256 value
    ) public override returns (bool) {
        _allowedValue[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }
    // What gets called in a permit
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) internal virtual override {
        _allowedValue[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public override returns (bool) {
        _allowedValue[msg.sender][spender] = _allowedValue[msg.sender][spender]
            .add(addedValue);
        emit Approval(msg.sender, spender, _allowedValue[msg.sender][spender]);
        return true;
    }
    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public override returns (bool) {
        uint256 oldValue = _allowedValue[msg.sender][spender];
        if (subtractedValue >= oldValue) {
            _allowedValue[msg.sender][spender] = 0;
        } else {
            _allowedValue[msg.sender][spender] = oldValue.sub(subtractedValue);
        }
        emit Approval(msg.sender, spender, _allowedValue[msg.sender][spender]);
        return true;
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IERC20.sol";
import "./lib/IERC2612Permit.sol";
import "./lib/Counters.sol";
import "./ERC20.sol";
abstract contract ERC20Permit is ERC20, IERC2612Permit {
    using Counters for Counters.Counter;
    mapping(address => Counters.Counter) private _nonces;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH =
        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    bytes32 public DOMAIN_SEPARATOR;
    constructor() {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256(
                    "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                ),
                keccak256(bytes(name())),
                keccak256(bytes("1")), // Version
                chainID,
                address(this)
            )
        );
    }
    /**
     * @dev See {IERC2612Permit-permit}.
     *
     */
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "Permit: expired deadline");
        bytes32 hashStruct = keccak256(
            abi.encode(
                PERMIT_TYPEHASH,
                owner,
                spender,
                amount,
                _nonces[owner].current(),
                deadline
            )
        );
        bytes32 _hash = keccak256(
            abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct)
        );
        address signer = ecrecover(_hash, v, r, s);
        require(
            signer != address(0) && signer == owner,
            "ZeroSwapPermit: Invalid signature"
        );
        _nonces[owner].increment();
        _approve(owner, spender, amount);
    }
    /**
     * @dev See {IERC2612Permit-nonces}.
     */
    function nonces(address owner) public view override returns (uint256) {
        return _nonces[owner].current();
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IOwnable {
    function owner() external view returns (address);
    function renounceOwnership() external;
    function transferOwnership(address newOwner_) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IOwnableManagement.sol";
contract OwnableManagement is IOwnableManagement {
      address internal _owner;
    address internal _newOwner;
    event OwnershipPushed(address indexed previousOwner, address indexed newOwner);
    event OwnershipPulled(address indexed previousOwner, address indexed newOwner);
    constructor () {
        _owner = msg.sender;
        emit OwnershipPushed( address(0), _owner );
    }
    function manager() public view override returns (address) {
        return _owner;
    }
    modifier onlyManager() {
        require( _owner == msg.sender, "Ownable: caller is not the owner" );
        _;
    }
    function renounceManagement() public virtual override onlyManager() {
        emit OwnershipPushed( _owner, address(0) );
        _owner = address(0);
    }
    function pushManagement( address newOwner_ ) public virtual override onlyManager() {
        require( newOwner_ != address(0), "Ownable: new owner is the zero address");
        emit OwnershipPushed( _owner, newOwner_ );
        _newOwner = newOwner_;
    }
    
    function pullManagement() public virtual override {
        require( msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled( _owner, _newOwner );
        _owner = _newOwner;
    }
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IERC20 {
    function decimals() external view returns (uint8);
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IERC2612Permit {
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
    function nonces(address owner) external view returns (uint256);
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./SafeMath.sol";
library Counters {
    using SafeMath for uint256;
    struct Counter {
        uint256 _value; // default: 0
    }
    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }
    function increment(Counter storage counter) internal {
        counter._value += 1;
    }
    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IERC20.sol";
import "./lib/SafeMath.sol";
abstract contract ERC20 is IERC20 {
    using SafeMath for uint256;
    // TODO comment actual hash value.
    bytes32 private constant ERC20TOKEN_ERC1820_INTERFACE_ID =
        keccak256("ERC20Token");
    // Present in ERC777
    mapping(address => uint256) internal _balances;
    // Present in ERC777
    mapping(address => mapping(address => uint256)) internal _allowances;
    // Present in ERC777
    uint256 internal _totalSupply;
    // Present in ERC777
    string internal _name;
    // Present in ERC777
    string internal _symbol;
    // Present in ERC777
    uint8 internal _decimals;
    constructor(string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view override returns (uint8) {
        return _decimals;
    }
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }
    function balanceOf(
        address account
    ) public view virtual override returns (uint256) {
        return _balances[account];
    }
    function transfer(
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }
    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    function approve(
        address spender,
        uint256 amount
    ) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            msg.sender,
            _allowances[sender][msg.sender].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }
    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public virtual returns (bool) {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].add(addedValue)
        );
        return true;
    }
    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public virtual returns (bool) {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }
    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);
    }
    function _mint(address account_, uint256 amount_) internal virtual {
        require(account_ != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(this), account_, amount_);
        _totalSupply = _totalSupply.add(amount_);
        _balances[account_] = _balances[account_].add(amount_);
        emit Transfer(address(this), account_, amount_);
    }
    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);
    }
    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);
    }
    function _beforeTokenTransfer(
        address from_,
        address to_,
        uint256 amount_
    ) internal virtual {}
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IOwnableManagement {
    function manager() external view returns (address);
    function renounceManagement() external;
    function pushManagement(address newOwner_) external;
    function pullManagement() external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function add32(uint32 a, uint32 b) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    function sub32(uint32 a, uint32 b) internal pure returns (uint32) {
        return sub32(a, b, "SafeMath: subtraction overflow");
    }
    function sub32(
        uint32 a,
        uint32 b,
        string memory errorMessage
    ) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        uint32 c = a - b;
        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function mul32(uint32 a, uint32 b) internal pure returns (uint32) {
        if (a == 0) {
            return 0;
        }
        uint32 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by 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;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add(div(a, 2), 1);
            while (b < c) {
                c = b;
                b = div(add(div(a, b), b), 2);
            }
        } else if (a != 0) {
            c = 1;
        }
    }
    function percentageAmount(
        uint256 total_,
        uint8 percentage_
    ) internal pure returns (uint256 percentAmount_) {
        return div(mul(total_, percentage_), 1000);
    }
    function substractPercentage(
        uint256 total_,
        uint8 percentageToSub_
    ) internal pure returns (uint256 result_) {
        return sub(total_, div(mul(total_, percentageToSub_), 1000));
    }
    function percentageOfTotal(
        uint256 part_,
        uint256 total_
    ) internal pure returns (uint256 percent_) {
        return div(mul(part_, 100), total_);
    }
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
    }
    function quadraticPricing(
        uint256 payment_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return sqrrt(mul(multiplier_, payment_));
    }
    function bondingCurve(
        uint256 supply_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return mul(multiplier_, supply_);
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma abicoder v2;
pragma solidity 0.7.5;
import "./lib/EnumerableSet.sol";
import "./lib/IERC2612Permit.sol";
import "./lib/IERC20.sol";
import "./ERC20Permit.sol";
import "./VaultOwned.sol";
import "./lib/IWETH.sol";
import "./lib/IUniswapV2Router.sol";
import "./lib/IUniswapV2Factory.sol";
contract Syncus is ERC20Permit, VaultOwned {
    using SafeMath for uint256;
    IUniswapV2Router public router =
        IUniswapV2Router(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address public uniswapV2Pair;
    address private treasury;
    uint256 public buyTax = 5;
    uint256 public sellTax = 15;
    mapping(address => bool) private _isExcludedFromTaxes;
    mapping(address => bool) public automatedMarketMakerPairs;
    receive() external payable {}
    constructor() ERC20("Syncus", "SYNC", 9) {
        _mint(msg.sender, 4_000_000_000 * 1e9);
        uniswapV2Pair = IUniswapV2Factory(router.factory()).createPair(
            address(this),
            router.WETH()
        );
        _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);
        treasury = msg.sender;
        excludeFromTaxes(owner(), true);
        excludeFromTaxes(address(this), true);
        excludeFromTaxes(address(0xdead), true);
    }
    function mint(address account_, uint256 amount_) external onlyVault {
        _mint(account_, amount_);
    }
    function burn(uint256 amount) public virtual {
        _burn(msg.sender, amount);
    }
    function burnFrom(address account_, uint256 amount_) public virtual {
        _burnFrom(account_, amount_);
    }
    function _burnFrom(address account_, uint256 amount_) public virtual {
        uint256 decreasedAllowance_ = allowance(account_, msg.sender).sub(
            amount_,
            "ERC20: burn amount exceeds allowance"
        );
        _approve(account_, msg.sender, decreasedAllowance_);
        _burn(account_, amount_);
    }
    function excludeFromTaxes(address account, bool excluded) public onlyOwner {
        _isExcludedFromTaxes[account] = excluded;
    }
    function setAutomatedMarketMakerPair(
        address pair,
        bool value
    ) public onlyOwner {
        _setAutomatedMarketMakerPair(pair, value);
    }
    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;
    }
    function updateBuyTax(uint256 _buyTax) external onlyOwner {
        require(_buyTax <= 100, "Cannot set tax higher than 100%");
        buyTax = _buyTax;
    }
    function updateSellTax(uint256 _sellTax) external onlyOwner {
        require(_sellTax <= 100, "Cannot set tax higher than 100%");
        sellTax = _sellTax;
    }
    function updateTaxes(uint256 _buyTax, uint256 _sellTax) external onlyOwner {
        require(
            _sellTax <= 100 && _buyTax <= 100,
            "Cannot set taxes higher than 100%"
        );
        buyTax = _buyTax;
        sellTax = _sellTax;
    }
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }
        bool takeTax = true;
        if (_isExcludedFromTaxes[from] || _isExcludedFromTaxes[to]) {
            takeTax = false;
        }
        uint256 taxes = 0;
        if (takeTax) {
            if (automatedMarketMakerPairs[to] && sellTax > 0) {
                taxes = amount.mul(sellTax).div(100);
            } else if (automatedMarketMakerPairs[from] && buyTax > 0) {
                taxes = amount.mul(buyTax).div(100);
            }
            if (taxes > 0) {
                super._transfer(from, treasury, taxes);
            }
            amount -= taxes;
        }
        super._transfer(from, to, amount);
    }
    function setTreasury(address _treasury) external onlyOwner {
        treasury = _treasury;
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.
    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];
        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.
            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;
            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
            bytes32 lastvalue = set._values[lastIndex];
            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based
            // Delete the slot where the moved value was stored
            set._values.pop();
            // Delete the index for the deleted slot
            delete set._indexes[value];
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(
        Set storage set,
        bytes32 value
    ) private view returns (bool) {
        return set._indexes[value] != 0;
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(
        Set storage set,
        uint256 index
    ) private view returns (bytes32) {
        require(
            set._values.length > index,
            "EnumerableSet: index out of bounds"
        );
        return set._values[index];
    }
    function _getValues(
        Set storage set_
    ) private view returns (bytes32[] storage) {
        return set_._values;
    }
    // TODO needs insert function that maintains order.
    // TODO needs NatSpec documentation comment.
    /**
     * Inserts new value by moving existing value at provided index to end
     * of array and setting provided value at provided index
     */
    function _insert(
        Set storage set_,
        uint256 index_,
        bytes32 valueToInsert_
    ) private returns (bool) {
        require(set_._values.length > index_);
        require(
            !_contains(set_, valueToInsert_),
            "Remove value you wish to insert if you wish to reorder array."
        );
        bytes32 existingValue_ = _at(set_, index_);
        set_._values[index_] = valueToInsert_;
        return _add(set_, existingValue_);
    }
    struct Bytes4Set {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes4Set storage set, bytes4 value) internal returns (bool) {
        return _add(set._inner, value);
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        Bytes4Set storage set,
        bytes4 value
    ) internal returns (bool) {
        return _remove(set._inner, value);
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        Bytes4Set storage set,
        bytes4 value
    ) internal view returns (bool) {
        return _contains(set._inner, value);
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(Bytes4Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        Bytes4Set storage set,
        uint256 index
    ) internal view returns (bytes4) {
        return bytes4(_at(set._inner, index));
    }
    function getValues(
        Bytes4Set storage set_
    ) internal view returns (bytes4[] memory) {
        bytes4[] memory bytes4Array_;
        for (
            uint256 iteration_ = 0;
            _length(set_._inner) > iteration_;
            iteration_++
        ) {
            bytes4Array_[iteration_] = bytes4(_at(set_._inner, iteration_));
        }
        return bytes4Array_;
    }
    function insert(
        Bytes4Set storage set_,
        uint256 index_,
        bytes4 valueToInsert_
    ) internal returns (bool) {
        return _insert(set_._inner, index_, valueToInsert_);
    }
    struct Bytes32Set {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(
        Bytes32Set storage set,
        bytes32 value
    ) internal returns (bool) {
        return _add(set._inner, value);
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        Bytes32Set storage set,
        bytes32 value
    ) internal returns (bool) {
        return _remove(set._inner, value);
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        Bytes32Set storage set,
        bytes32 value
    ) internal view returns (bool) {
        return _contains(set._inner, value);
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        Bytes32Set storage set,
        uint256 index
    ) internal view returns (bytes32) {
        return _at(set._inner, index);
    }
    function getValues(
        Bytes32Set storage set_
    ) internal view returns (bytes4[] memory) {
        bytes4[] memory bytes4Array_;
        for (
            uint256 iteration_ = 0;
            _length(set_._inner) >= iteration_;
            iteration_++
        ) {
            bytes4Array_[iteration_] = bytes4(at(set_, iteration_));
        }
        return bytes4Array_;
    }
    function insert(
        Bytes32Set storage set_,
        uint256 index_,
        bytes32 valueToInsert_
    ) internal returns (bool) {
        return _insert(set_._inner, index_, valueToInsert_);
    }
    // AddressSet
    struct AddressSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(
        AddressSet storage set,
        address value
    ) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        AddressSet storage set,
        address value
    ) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        AddressSet storage set,
        address value
    ) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        AddressSet storage set,
        uint256 index
    ) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }
    /**
     * TODO Might require explicit conversion of bytes32[] to address[].
     *  Might require iteration.
     */
    function getValues(
        AddressSet storage set_
    ) internal view returns (address[] memory) {
        address[] memory addressArray;
        for (
            uint256 iteration_ = 0;
            _length(set_._inner) >= iteration_;
            iteration_++
        ) {
            addressArray[iteration_] = at(set_, iteration_);
        }
        return addressArray;
    }
    function insert(
        AddressSet storage set_,
        uint256 index_,
        address valueToInsert_
    ) internal returns (bool) {
        return _insert(set_._inner, index_, bytes32(uint256(valueToInsert_)));
    }
    // UintSet
    struct UintSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        UintSet storage set,
        uint256 value
    ) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        UintSet storage set,
        uint256 value
    ) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        UintSet storage set,
        uint256 index
    ) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
    struct UInt256Set {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(
        UInt256Set storage set,
        uint256 value
    ) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(
        UInt256Set storage set,
        uint256 value
    ) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(
        UInt256Set storage set,
        uint256 value
    ) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UInt256Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(
        UInt256Set storage set,
        uint256 index
    ) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IERC2612Permit {
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
    function nonces(address owner) external view returns (uint256);
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IERC20 {
    function decimals() external view returns (uint8);
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IERC20.sol";
import "./lib/IERC2612Permit.sol";
import "./lib/Counters.sol";
import "./ERC20.sol";
abstract contract ERC20Permit is ERC20, IERC2612Permit {
    using Counters for Counters.Counter;
    mapping(address => Counters.Counter) private _nonces;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH =
        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    bytes32 public DOMAIN_SEPARATOR;
    constructor() {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256(
                    "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                ),
                keccak256(bytes(name())),
                keccak256(bytes("1")), // Version
                chainID,
                address(this)
            )
        );
    }
    /**
     * @dev See {IERC2612Permit-permit}.
     *
     */
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "Permit: expired deadline");
        bytes32 hashStruct = keccak256(
            abi.encode(
                PERMIT_TYPEHASH,
                owner,
                spender,
                amount,
                _nonces[owner].current(),
                deadline
            )
        );
        bytes32 _hash = keccak256(
            abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct)
        );
        address signer = ecrecover(_hash, v, r, s);
        require(
            signer != address(0) && signer == owner,
            "ZeroSwapPermit: Invalid signature"
        );
        _nonces[owner].increment();
        _approve(owner, spender, amount);
    }
    /**
     * @dev See {IERC2612Permit-nonces}.
     */
    function nonces(address owner) public view override returns (uint256) {
        return _nonces[owner].current();
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./Ownable.sol";
contract VaultOwned is Ownable {
    address internal _vault;
    function setVault(address vault_) external onlyOwner returns (bool) {
        _vault = vault_;
        return true;
    }
    function vault() public view returns (address) {
        return _vault;
    }
    modifier onlyVault() {
        require(_vault == msg.sender, "VaultOwned: caller is not the Vault");
        _;
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IWETH {
    /**
     * @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
    );
    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
    /// @notice Deposit ether to get wrapped ether
    function deposit() external payable;
    /// @notice Withdraw wrapped ether to get ether
    function withdraw(uint256) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IUniswapV2Router {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    )
        external
        payable
        returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable returns (uint[] memory amounts);
    function swapTokensForExactETH(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactTokensForETH(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapETHForExactTokens(
        uint amountOut,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable returns (uint[] memory amounts);
    function quote(
        uint amountA,
        uint reserveA,
        uint reserveB
    ) external pure returns (uint amountB);
    function getAmountOut(
        uint amountIn,
        uint reserveIn,
        uint reserveOut
    ) external pure returns (uint amountOut);
    function getAmountIn(
        uint amountOut,
        uint reserveIn,
        uint reserveOut
    ) external pure returns (uint amountIn);
    function getAmountsOut(
        uint amountIn,
        address[] calldata path
    ) external view returns (uint[] memory amounts);
    function getAmountsIn(
        uint amountOut,
        address[] calldata path
    ) external view returns (uint[] memory amounts);
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint amountETH);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint
    );
    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./SafeMath.sol";
library Counters {
    using SafeMath for uint256;
    struct Counter {
        uint256 _value; // default: 0
    }
    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }
    function increment(Counter storage counter) internal {
        counter._value += 1;
    }
    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IERC20.sol";
import "./lib/SafeMath.sol";
abstract contract ERC20 is IERC20 {
    using SafeMath for uint256;
    // TODO comment actual hash value.
    bytes32 private constant ERC20TOKEN_ERC1820_INTERFACE_ID =
        keccak256("ERC20Token");
    // Present in ERC777
    mapping(address => uint256) internal _balances;
    // Present in ERC777
    mapping(address => mapping(address => uint256)) internal _allowances;
    // Present in ERC777
    uint256 internal _totalSupply;
    // Present in ERC777
    string internal _name;
    // Present in ERC777
    string internal _symbol;
    // Present in ERC777
    uint8 internal _decimals;
    constructor(string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view override returns (uint8) {
        return _decimals;
    }
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }
    function balanceOf(
        address account
    ) public view virtual override returns (uint256) {
        return _balances[account];
    }
    function transfer(
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }
    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    function approve(
        address spender,
        uint256 amount
    ) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            msg.sender,
            _allowances[sender][msg.sender].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }
    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public virtual returns (bool) {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].add(addedValue)
        );
        return true;
    }
    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public virtual returns (bool) {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }
    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);
    }
    function _mint(address account_, uint256 amount_) internal virtual {
        require(account_ != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(this), account_, amount_);
        _totalSupply = _totalSupply.add(amount_);
        _balances[account_] = _balances[account_].add(amount_);
        emit Transfer(address(this), account_, amount_);
    }
    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);
    }
    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);
    }
    function _beforeTokenTransfer(
        address from_,
        address to_,
        uint256 amount_
    ) internal virtual {}
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IOwnable.sol";
contract Ownable is IOwnable {
    address internal _owner;
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
    constructor() {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }
    function owner() public view override returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }
    function renounceOwnership() public virtual override onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    function transferOwnership(
        address newOwner_
    ) public virtual override onlyOwner {
        require(
            newOwner_ != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner_);
        _owner = newOwner_;
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function add32(uint32 a, uint32 b) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    function sub32(uint32 a, uint32 b) internal pure returns (uint32) {
        return sub32(a, b, "SafeMath: subtraction overflow");
    }
    function sub32(
        uint32 a,
        uint32 b,
        string memory errorMessage
    ) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        uint32 c = a - b;
        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function mul32(uint32 a, uint32 b) internal pure returns (uint32) {
        if (a == 0) {
            return 0;
        }
        uint32 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by 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;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add(div(a, 2), 1);
            while (b < c) {
                c = b;
                b = div(add(div(a, b), b), 2);
            }
        } else if (a != 0) {
            c = 1;
        }
    }
    function percentageAmount(
        uint256 total_,
        uint8 percentage_
    ) internal pure returns (uint256 percentAmount_) {
        return div(mul(total_, percentage_), 1000);
    }
    function substractPercentage(
        uint256 total_,
        uint8 percentageToSub_
    ) internal pure returns (uint256 result_) {
        return sub(total_, div(mul(total_, percentageToSub_), 1000));
    }
    function percentageOfTotal(
        uint256 part_,
        uint256 total_
    ) internal pure returns (uint256 percent_) {
        return div(mul(part_, 100), total_);
    }
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
    }
    function quadraticPricing(
        uint256 payment_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return sqrrt(mul(multiplier_, payment_));
    }
    function bondingCurve(
        uint256 supply_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return mul(multiplier_, supply_);
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IOwnable {
    function owner() external view returns (address);
    function renounceOwnership() external;
    function transferOwnership(address newOwner_) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/SafeMath.sol";
import "./lib/Address.sol";
import "./lib/IERC20.sol";
import "./lib/SafeERC20.sol";
import "./lib/ISyncus.sol";
import "./lib/IERC20Mintable.sol";
import "./lib/ISyncusCalculator.sol";
import "./lib/IOwnable.sol";
import "./OwnableManagement.sol";
contract SyncusTreasury is OwnableManagement {
    using SafeMath for uint;
    using SafeMath for uint32;
    using SafeERC20 for IERC20;
    event Deposit(address indexed token, uint amount, uint value);
    event Withdrawal(address indexed token, uint amount, uint value);
    event CreateDebt(
        address indexed debtor,
        address indexed token,
        uint amount,
        uint value
    );
    event RepayDebt(
        address indexed debtor,
        address indexed token,
        uint amount,
        uint value
    );
    event ReservesManaged(address indexed token, uint amount);
    event ReservesUpdated(uint indexed totalReserves);
    event ReservesAudited(uint indexed totalReserves);
    event RewardsMinted(
        address indexed caller,
        address indexed recipient,
        uint amount
    );
    event ChangeQueued(MANAGING indexed managing, address queued);
    event ChangeActivated(
        MANAGING indexed managing,
        address activated,
        bool result
    );
    enum MANAGING {
        RESERVEDEPOSITOR,
        RESERVESPENDER,
        RESERVETOKEN,
        RESERVEMANAGER,
        LIQUIDITYDEPOSITOR,
        LIQUIDITYTOKEN,
        LIQUIDITYMANAGER,
        DEBTOR,
        REWARDMANAGER,
        VESYNC
    }
    address public immutable Sync;
    uint32 public secondsNeededForQueue;
    address[] public reserveTokens; // Push only, beware false-positives.
    mapping(address => bool) public isReserveToken;
    mapping(address => uint32) public reserveTokenQueue; // Delays changes to mapping.
    address[] public reserveDepositors; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isReserveDepositor;
    mapping(address => uint32) public reserveDepositorQueue; // Delays changes to mapping.
    address[] public reserveSpenders; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isReserveSpender;
    mapping(address => uint32) public reserveSpenderQueue; // Delays changes to mapping.
    address[] public liquidityTokens; // Push only, beware false-positives.
    mapping(address => bool) public isLiquidityToken;
    mapping(address => uint32) public LiquidityTokenQueue; // Delays changes to mapping.
    address[] public liquidityDepositors; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isLiquidityDepositor;
    mapping(address => uint32) public LiquidityDepositorQueue; // Delays changes to mapping.
    mapping(address => address) public syncusCalculator; //  calculator for liquidity token
    address[] public reserveManagers; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isReserveManager;
    mapping(address => uint32) public ReserveManagerQueue; // Delays changes to mapping.
    address[] public liquidityManagers; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isLiquidityManager;
    mapping(address => uint32) public LiquidityManagerQueue; // Delays changes to mapping.
    address[] public debtors; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isDebtor;
    mapping(address => uint32) public debtorQueue; // Delays changes to mapping.
    mapping(address => uint) public debtorBalance;
    address[] public rewardManagers; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isRewardManager;
    mapping(address => uint32) public rewardManagerQueue; // Delays changes to mapping.
    address public veSYNC;
    uint public veSYNCQueue; // Delays change to veSYNC address
    uint public totalReserves; // Risk-free value of all assets
    uint public totalDebt;
    bool isBackingEnabled = false;
    receive() external payable {}
    constructor(address _Sync, address _USDC, address _etherCalculator) {
        require(_Sync != address(0));
        require(_USDC != address(0));
        require(_etherCalculator != address(0));
        Sync = _Sync;
        isReserveToken[_USDC] = true;
        reserveTokens.push(_USDC);
        syncusCalculator[address(0)] = _etherCalculator;
    }
    /**
        @notice allow approved address to deposit an asset for SYNC
        @param _amount uint
        @param _token address
        @param _profit uint
        @return send_ uint
     */
    function deposit(
        uint _amount,
        address _token,
        uint _profit //profit in SYNC, 9 decimals needed
    ) external returns (uint send_) {
        require(
            isReserveToken[_token] || isLiquidityToken[_token],
            "Not accepted"
        );
        IERC20(_token).safeTransferFrom(msg.sender, address(this), _amount);
        if (isReserveToken[_token]) {
            require(isReserveDepositor[msg.sender], "Not approved");
        } else {
            require(isLiquidityDepositor[msg.sender], "Not approved");
        }
        uint value = valueOf(_token, _amount);
        // mint SYNC needed and store amount of rewards for distribution
        send_ = value.sub(_profit);
        IERC20Mintable(Sync).mint(msg.sender, send_);
        totalReserves = totalReserves.add(value);
        emit ReservesUpdated(totalReserves);
        emit Deposit(_token, _amount, value);
    }
    /**
        @notice allow approved address to burn SYNC for reserves
        @param _amount uint
        @param _token address
     */
    function withdraw(uint _amount, address _token) external {
        require(isReserveToken[_token], "Not accepted"); // Only reserves can be used for redemptions
        require(isReserveSpender[msg.sender] == true, "Not approved");
        uint value = valueOf(_token, _amount);
        ISyncus(Sync).burnFrom(msg.sender, value);
        totalReserves = totalReserves.sub(value);
        emit ReservesUpdated(totalReserves);
        IERC20(_token).safeTransfer(msg.sender, _amount);
        emit Withdrawal(_token, _amount, value);
    }
    /**
        @notice allow approved address to borrow reserves
        @param _amount uint
        @param _token address
     */
    function incurDebt(uint _amount, address _token) external {
        require(isDebtor[msg.sender], "Not approved");
        require(isReserveToken[_token], "Not accepted");
        uint value = valueOf(_token, _amount);
        uint maximumDebt = IERC20(veSYNC).balanceOf(msg.sender); // Can only borrow against veSYNC held
        uint availableDebt = maximumDebt.sub(debtorBalance[msg.sender]);
        require(value <= availableDebt, "Exceeds debt limit");
        debtorBalance[msg.sender] = debtorBalance[msg.sender].add(value);
        totalDebt = totalDebt.add(value);
        totalReserves = totalReserves.sub(value);
        emit ReservesUpdated(totalReserves);
        IERC20(_token).transfer(msg.sender, _amount);
        emit CreateDebt(msg.sender, _token, _amount, value);
    }
    /**
        @notice allow approved address to repay borrowed reserves with reserves
        @param _amount uint
        @param _token address
     */
    function repayDebtWithReserve(uint _amount, address _token) external {
        require(isDebtor[msg.sender], "Not approved");
        require(isReserveToken[_token], "Not accepted");
        IERC20(_token).safeTransferFrom(msg.sender, address(this), _amount);
        uint value = valueOf(_token, _amount);
        debtorBalance[msg.sender] = debtorBalance[msg.sender].sub(value);
        totalDebt = totalDebt.sub(value);
        totalReserves = totalReserves.add(value);
        emit ReservesUpdated(totalReserves);
        emit RepayDebt(msg.sender, _token, _amount, value);
    }
    /**
        @notice allow approved address to repay borrowed reserves with SYNC
        @param _amount uint
     */
    function repayDebtWithSYNC(uint _amount) external {
        require(isDebtor[msg.sender], "Not approved");
        ISyncus(Sync).burnFrom(msg.sender, _amount);
        debtorBalance[msg.sender] = debtorBalance[msg.sender].sub(_amount);
        totalDebt = totalDebt.sub(_amount);
        emit RepayDebt(msg.sender, Sync, _amount, _amount);
    }
    /**
        @notice allow approved address to withdraw assets
        @param _token address
        @param _amount uint
     */
    function manage(address _token, uint _amount) external {
        if (isLiquidityToken[_token]) {
            require(isLiquidityManager[msg.sender], "Not approved");
        } else {
            require(isReserveManager[msg.sender], "Not approved");
        }
        uint value = valueOf(_token, _amount);
        if (isBackingEnabled) {
            require(value <= excessReserves(), "Insufficient reserves");
        }
        totalReserves = totalReserves.sub(value);
        emit ReservesUpdated(totalReserves);
        IERC20(_token).safeTransfer(msg.sender, _amount);
        emit ReservesManaged(_token, _amount);
    }
    /**
        @notice send epoch reward to staking contract
     */
    function mintRewards(address _recipient, uint _amount) external {
        require(isRewardManager[msg.sender], "Not approved");
        if (isBackingEnabled) {
            require(_amount <= excessReserves(), "Insufficient reserves");
        }
        IERC20Mintable(Sync).mint(_recipient, _amount);
        emit RewardsMinted(msg.sender, _recipient, _amount);
    }
    /**
        @notice returns excess reserves not backing tokens
        @return uint
     */
    function excessReserves() public view returns (uint) {
        uint supply = IERC20(Sync).totalSupply().sub(totalDebt);
        if (supply > totalReserves) {
            return 0;
        }
        return totalReserves.sub(supply);
    }
    /**
        @notice takes inventory of all tracked assets
        @notice always consolidate to recognized reserves before audit
     */
    function auditReserves() external onlyManager {
        uint reserves;
        for (uint i = 0; i < reserveTokens.length; i++) {
            reserves = reserves.add(
                valueOf(
                    reserveTokens[i],
                    IERC20(reserveTokens[i]).balanceOf(address(this))
                )
            );
        }
        for (uint i = 0; i < liquidityTokens.length; i++) {
            reserves = reserves.add(
                valueOf(
                    liquidityTokens[i],
                    IERC20(liquidityTokens[i]).balanceOf(address(this))
                )
            );
        }
        reserves = reserves.add(valueOf(address(0), address(this).balance));
        totalReserves = reserves;
        emit ReservesUpdated(reserves);
        emit ReservesAudited(reserves);
    }
    /**
        @notice returns SYNC valuation of asset
        @param _token address
        @param _amount uint
        @return value_ uint
     */
    function valueOf(
        address _token,
        uint _amount
    ) public view returns (uint value_) {
        if (_token == address(0)) {
            value_ = ISyncusCalculator(syncusCalculator[_token]).valuationEther(
                _amount
            );
        } else if (isReserveToken[_token]) {
            // convert amount to match SYNC decimals
            value_ = _amount.mul(10 ** IERC20(Sync).decimals()).div(
                10 ** IERC20(_token).decimals()
            );
        } else if (isLiquidityToken[_token]) {
            value_ = ISyncusCalculator(syncusCalculator[_token]).valuation(
                _token,
                _amount
            );
        }
    }
    /**
        @notice queue address to change boolean in mapping
        @param _managing MANAGING
        @param _address address
        @return bool
     */
    function queue(
        MANAGING _managing,
        address _address
    ) external onlyManager returns (bool) {
        require(_address != address(0));
        if (_managing == MANAGING.RESERVEDEPOSITOR) {
            // 0
            reserveDepositorQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.RESERVESPENDER) {
            // 1
            reserveSpenderQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.RESERVETOKEN) {
            // 2
            reserveTokenQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.RESERVEMANAGER) {
            // 3
            ReserveManagerQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue.mul32(2)
            );
        } else if (_managing == MANAGING.LIQUIDITYDEPOSITOR) {
            // 4
            LiquidityDepositorQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.LIQUIDITYTOKEN) {
            // 5
            LiquidityTokenQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.LIQUIDITYMANAGER) {
            // 6
            LiquidityManagerQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue.mul32(2)
            );
        } else if (_managing == MANAGING.DEBTOR) {
            // 7
            debtorQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.REWARDMANAGER) {
            // 8
            rewardManagerQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.VESYNC) {
            // 9
            veSYNCQueue = uint32(block.timestamp).add32(secondsNeededForQueue);
        } else return false;
        emit ChangeQueued(_managing, _address);
        return true;
    }
    /**
        @notice verify queue then set boolean in mapping
        @param _managing MANAGING
        @param _address address
        @param _calculator address
        @return bool
     */
    function toggle(
        MANAGING _managing,
        address _address,
        address _calculator
    ) external onlyManager returns (bool) {
        require(_address != address(0));
        bool result;
        if (_managing == MANAGING.RESERVEDEPOSITOR) {
            // 0
            if (
                requirements(
                    reserveDepositorQueue,
                    isReserveDepositor,
                    _address
                )
            ) {
                reserveDepositorQueue[_address] = 0;
                if (!listContains(reserveDepositors, _address)) {
                    reserveDepositors.push(_address);
                }
            }
            result = !isReserveDepositor[_address];
            isReserveDepositor[_address] = result;
        } else if (_managing == MANAGING.RESERVESPENDER) {
            // 1
            if (requirements(reserveSpenderQueue, isReserveSpender, _address)) {
                reserveSpenderQueue[_address] = 0;
                if (!listContains(reserveSpenders, _address)) {
                    reserveSpenders.push(_address);
                }
            }
            result = !isReserveSpender[_address];
            isReserveSpender[_address] = result;
        } else if (_managing == MANAGING.RESERVETOKEN) {
            // 2
            if (requirements(reserveTokenQueue, isReserveToken, _address)) {
                reserveTokenQueue[_address] = 0;
                if (!listContains(reserveTokens, _address)) {
                    reserveTokens.push(_address);
                }
            }
            result = !isReserveToken[_address];
            isReserveToken[_address] = result;
        } else if (_managing == MANAGING.RESERVEMANAGER) {
            // 3
            if (requirements(ReserveManagerQueue, isReserveManager, _address)) {
                reserveManagers.push(_address);
                ReserveManagerQueue[_address] = 0;
                if (!listContains(reserveManagers, _address)) {
                    reserveManagers.push(_address);
                }
            }
            result = !isReserveManager[_address];
            isReserveManager[_address] = result;
        } else if (_managing == MANAGING.LIQUIDITYDEPOSITOR) {
            // 4
            if (
                requirements(
                    LiquidityDepositorQueue,
                    isLiquidityDepositor,
                    _address
                )
            ) {
                liquidityDepositors.push(_address);
                LiquidityDepositorQueue[_address] = 0;
                if (!listContains(liquidityDepositors, _address)) {
                    liquidityDepositors.push(_address);
                }
            }
            result = !isLiquidityDepositor[_address];
            isLiquidityDepositor[_address] = result;
        } else if (_managing == MANAGING.LIQUIDITYTOKEN) {
            // 5
            if (requirements(LiquidityTokenQueue, isLiquidityToken, _address)) {
                LiquidityTokenQueue[_address] = 0;
                if (!listContains(liquidityTokens, _address)) {
                    liquidityTokens.push(_address);
                }
            }
            result = !isLiquidityToken[_address];
            isLiquidityToken[_address] = result;
            syncusCalculator[_address] = _calculator;
        } else if (_managing == MANAGING.LIQUIDITYMANAGER) {
            // 6
            if (
                requirements(
                    LiquidityManagerQueue,
                    isLiquidityManager,
                    _address
                )
            ) {
                LiquidityManagerQueue[_address] = 0;
                if (!listContains(liquidityManagers, _address)) {
                    liquidityManagers.push(_address);
                }
            }
            result = !isLiquidityManager[_address];
            isLiquidityManager[_address] = result;
        } else if (_managing == MANAGING.DEBTOR) {
            // 7
            if (requirements(debtorQueue, isDebtor, _address)) {
                debtorQueue[_address] = 0;
                if (!listContains(debtors, _address)) {
                    debtors.push(_address);
                }
            }
            result = !isDebtor[_address];
            isDebtor[_address] = result;
        } else if (_managing == MANAGING.REWARDMANAGER) {
            // 8
            if (requirements(rewardManagerQueue, isRewardManager, _address)) {
                rewardManagerQueue[_address] = 0;
                if (!listContains(rewardManagers, _address)) {
                    rewardManagers.push(_address);
                }
            }
            result = !isRewardManager[_address];
            isRewardManager[_address] = result;
        } else if (_managing == MANAGING.VESYNC) {
            // 9
            veSYNCQueue = 0;
            veSYNC = _address;
            result = true;
        } else return false;
        emit ChangeActivated(_managing, _address, result);
        return true;
    }
    /**
        @notice checks requirements and returns altered structs
        @param queue_ mapping( address => uint )
        @param status_ mapping( address => bool )
        @param _address address
        @return bool 
     */
    function requirements(
        mapping(address => uint32) storage queue_,
        mapping(address => bool) storage status_,
        address _address
    ) internal view returns (bool) {
        if (!status_[_address]) {
            require(queue_[_address] != 0, "Must queue");
            require(
                queue_[_address] <= uint32(block.timestamp),
                "Queue not expired"
            );
            return true;
        }
        return false;
    }
    /**
        @notice checks array to ensure against duplicate
        @param _list address[]
        @param _token address
        @return bool
     */
    function listContains(
        address[] storage _list,
        address _token
    ) internal view returns (bool) {
        for (uint i = 0; i < _list.length; i++) {
            if (_list[i] == _token) {
                return true;
            }
        }
        return false;
    }
    function setEtherCalculator(address _calculator) external onlyManager {
        syncusCalculator[address(0)] = _calculator;
    }
    function setIsBackingEnabled(bool _isBackingEnabled) external onlyManager {
        isBackingEnabled = _isBackingEnabled;
    }
    function withdrawEther(uint _amount) external onlyManager {
        msg.sender.transfer(_amount);
    }
    // sync taxes and lost tokens
    function withdrawToken(address _token, uint _amount) external onlyManager {
        IERC20(_token).safeTransfer(msg.sender, _amount);
    }
    function emergencyWithdrawEther(address _recipient) external onlyManager {
        require(_recipient != address(0), "Invalid recipient address");
        uint balance = address(this).balance;
        (bool success, ) = _recipient.call{value: balance}("");
        require(success, "Transfer failed");
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function add32(uint32 a, uint32 b) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    function sub32(uint32 a, uint32 b) internal pure returns (uint32) {
        return sub32(a, b, "SafeMath: subtraction overflow");
    }
    function sub32(
        uint32 a,
        uint32 b,
        string memory errorMessage
    ) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        uint32 c = a - b;
        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function mul32(uint32 a, uint32 b) internal pure returns (uint32) {
        if (a == 0) {
            return 0;
        }
        uint32 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by 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;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add(div(a, 2), 1);
            while (b < c) {
                c = b;
                b = div(add(div(a, b), b), 2);
            }
        } else if (a != 0) {
            c = 1;
        }
    }
    function percentageAmount(
        uint256 total_,
        uint8 percentage_
    ) internal pure returns (uint256 percentAmount_) {
        return div(mul(total_, percentage_), 1000);
    }
    function substractPercentage(
        uint256 total_,
        uint8 percentageToSub_
    ) internal pure returns (uint256 result_) {
        return sub(total_, div(mul(total_, percentageToSub_), 1000));
    }
    function percentageOfTotal(
        uint256 part_,
        uint256 total_
    ) internal pure returns (uint256 percent_) {
        return div(mul(part_, 100), total_);
    }
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2);
    }
    function quadraticPricing(
        uint256 payment_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return sqrrt(mul(multiplier_, payment_));
    }
    function bondingCurve(
        uint256 supply_,
        uint256 multiplier_
    ) internal pure returns (uint256) {
        return mul(multiplier_, supply_);
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
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}
     */
    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).
     *
     * 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"
        );
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return _verifyCallResult(success, returndata, 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);
            }
        }
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data
    ) internal view returns (bytes memory) {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(
        address target,
        bytes memory data
    ) internal returns (bytes memory) {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        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);
            }
        }
    }
    function addressToString(
        address _address
    ) internal pure returns (string memory) {
        bytes32 _bytes = bytes32(uint256(_address));
        bytes memory HEX = "0123456789abcdef";
        bytes memory _addr = new bytes(42);
        _addr[0] = "0";
        _addr[1] = "x";
        for (uint256 i = 0; i < 20; i++) {
            _addr[2 + i * 2] = HEX[uint8(_bytes[i + 12] >> 4)];
            _addr[3 + i * 2] = HEX[uint8(_bytes[i + 12] & 0x0f)];
        }
        return string(_addr);
    }
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IERC20 {
    function decimals() external view returns (uint8);
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./SafeMath.sol";
import "./Address.sol";
import "./IERC20.sol";
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");
        }
    }
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface ISyncus {
    function burn(uint256 amount) external;
    function burnFrom(address account_, uint256 amount_) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IERC20Mintable {
    function mint(uint256 amount_) external;
    function mint(address account_, uint256 ammount_) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface ISyncusCalculator {
    function valuation(
        address pair_,
        uint amount_
    ) external view returns (uint _value);
    function valuationEther(uint amount_) external view returns (uint _value);
    function markdown(address _pair) external view returns (uint);
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IOwnable {
    function owner() external view returns (address);
    function renounceOwnership() external;
    function transferOwnership(address newOwner_) external;
}
// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
import "./lib/IOwnableManagement.sol";
contract OwnableManagement is IOwnableManagement {
      address internal _owner;
    address internal _newOwner;
    event OwnershipPushed(address indexed previousOwner, address indexed newOwner);
    event OwnershipPulled(address indexed previousOwner, address indexed newOwner);
    constructor () {
        _owner = msg.sender;
        emit OwnershipPushed( address(0), _owner );
    }
    function manager() public view override returns (address) {
        return _owner;
    }
    modifier onlyManager() {
        require( _owner == msg.sender, "Ownable: caller is not the owner" );
        _;
    }
    function renounceManagement() public virtual override onlyManager() {
        emit OwnershipPushed( _owner, address(0) );
        _owner = address(0);
    }
    function pushManagement( address newOwner_ ) public virtual override onlyManager() {
        require( newOwner_ != address(0), "Ownable: new owner is the zero address");
        emit OwnershipPushed( _owner, newOwner_ );
        _newOwner = newOwner_;
    }
    
    function pullManagement() public virtual override {
        require( msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled( _owner, _newOwner );
        _owner = _newOwner;
    }
}// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;
interface IOwnableManagement {
    function manager() external view returns (address);
    function renounceManagement() external;
    function pushManagement(address newOwner_) external;
    function pullManagement() external;
}