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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./utils/ERC20PermitLight.sol";
import "./Equity.sol";
import "./interface/IReserve.sol";
import "./interface/IFrankencoin.sol";

/**
 * @title FrankenCoin
 * @notice The Frankencoin (ZCHF) is an ERC-20 token that is designed to track the value of the Swiss franc.
 * It is not upgradable, but open to arbitrary minting plugins. These are automatically accepted if none of the
 * qualified pool share holders casts a veto, leading to a flexible but conservative governance.
 */
contract Frankencoin is ERC20PermitLight, IFrankencoin {
    /**
     * @notice Minimal fee and application period when suggesting a new minter.
     */
    uint256 public constant MIN_FEE = 1000 * (10 ** 18);
    uint256 public immutable MIN_APPLICATION_PERIOD; // for example 10 days

    /**
     * @notice The contract that holds the reserve.
     */
    IReserve public immutable override reserve;

    /**
     * @notice How much of the reserve belongs to the minters. Everything else belongs to the pool share holders.
     * Stored with 6 additional digits of accuracy so no rounding is necessary when dealing with parts per
     * million (ppm) in reserve calculations.
     */
    uint256 private minterReserveE6;

    /**
     * @notice Map of minters to approval time stamps. If the time stamp is in the past, the minter contract is allowed
     * to mint Frankencoins.
     */
    mapping(address minter => uint256 validityStart) public minters;

    /**
     * @notice List of positions that are allowed to mint and the minter that registered them.
     */
    mapping(address position => address registeringMinter) public positions;

    event MinterApplied(address indexed minter, uint256 applicationPeriod, uint256 applicationFee, string message);
    event MinterDenied(address indexed minter, string message);
    event Loss(address indexed reportingMinter, uint256 amount);
    event Profit(address indexed reportingMinter, uint256 amount);

    error PeriodTooShort();
    error FeeTooLow();
    error AlreadyRegistered();
    error NotMinter();
    error TooLate();

    modifier minterOnly() {
        if (!isMinter(msg.sender) && !isMinter(positions[msg.sender])) revert NotMinter();
        _;
    }

    /**
     * @notice Initiates the Frankencoin with the provided minimum application period for new plugins
     * in seconds, for example 10 days, i.e. 3600*24*10 = 864000
     */
    constructor(uint256 _minApplicationPeriod) ERC20(18) {
        MIN_APPLICATION_PERIOD = _minApplicationPeriod;
        reserve = new Equity(this);
    }

    function name() external pure override returns (string memory) {
        return "Frankencoin";
    }

    function symbol() external pure override returns (string memory) {
        return "ZCHF";
    }

    function initialize(address _minter, string calldata _message) external {
        require(totalSupply() == 0 && reserve.totalSupply() == 0);
        minters[_minter] = block.timestamp;
        emit MinterApplied(_minter, 0, 0, _message);
    }

    /**
     * @notice Publicly accessible method to suggest a new way of minting Frankencoin.
     * @dev The caller has to pay an application fee that is irrevocably lost even if the new minter is vetoed.
     * The caller must assume that someone will veto the new minter unless there is broad consensus that the new minter
     * adds value to the Frankencoin system. Complex proposals should have application periods and applications fees
     * above the minimum. It is assumed that over time, informal ways to coordinate on new minters emerge. The message
     * parameter might be useful for initiating further communication. Maybe it contains a link to a website describing
     * the proposed minter.
     *
     * @param _minter              An address that is given the permission to mint Frankencoins
     * @param _applicationPeriod   The time others have to veto the suggestion, at least MIN_APPLICATION_PERIOD
     * @param _applicationFee      The fee paid by the caller, at least MIN_FEE
     * @param _message             An optional human readable message to everyone watching this contract
     */
    function suggestMinter(
        address _minter,
        uint256 _applicationPeriod,
        uint256 _applicationFee,
        string calldata _message
    ) external override {
        if (_applicationPeriod < MIN_APPLICATION_PERIOD) revert PeriodTooShort();
        if (_applicationFee < MIN_FEE) revert FeeTooLow();
        if (minters[_minter] != 0) revert AlreadyRegistered();
        _collectProfits(address(this), msg.sender, _applicationFee);
        minters[_minter] = block.timestamp + _applicationPeriod;
        emit MinterApplied(_minter, _applicationPeriod, _applicationFee, _message);
    }

    /**
     * @notice Make the system more user friendly by skipping the allowance in many cases.
     * @dev We trust minters and the positions they have created to mint and burn as they please, so
     * giving them arbitrary allowances does not pose an additional risk.
     */
    function _allowance(address owner, address spender) internal view override returns (uint256) {
        uint256 explicit = super._allowance(owner, spender);
        if (explicit > 0) {
            return explicit; // don't waste gas checking minter
        } else if (isMinter(spender) || isMinter(getPositionParent(spender)) || spender == address(reserve)) {
            return INFINITY;
        } else {
            return 0;
        }
    }

    /**
     * @notice The reserve provided by the owners of collateralized positions.
     * @dev The minter reserve can be used to cover losses after the equity holders have been wiped out.
     */
    function minterReserve() public view returns (uint256) {
        return minterReserveE6 / 1000000;
    }

    /**
     * @notice Allows minters to register collateralized debt positions, thereby giving them the ability to mint Frankencoins.
     * @dev It is assumed that the responsible minter that registers the position ensures that the position can be trusted.
     */
    function registerPosition(address _position) external override {
        if (!isMinter(msg.sender)) revert NotMinter();
        positions[_position] = msg.sender;
    }

    /**
     * @notice The amount of equity of the Frankencoin system in ZCHF, owned by the holders of Frankencoin Pool Shares.
     * @dev Note that the equity contract technically holds both the minter reserve as well as the equity, so the minter
     * reserve must be subtracted. All fees and other kind of income is added to the Equity contract and essentially
     * constitutes profits attributable to the pool share holders.
     */
    function equity() public view returns (uint256) {
        uint256 balance = balanceOf(address(reserve));
        uint256 minReserve = minterReserve();
        if (balance <= minReserve) {
            return 0;
        } else {
            return balance - minReserve;
        }
    }

    /**
     * @notice Qualified pool share holders can deny minters during the application period.
     * @dev Calling this function is relatively cheap thanks to the deletion of a storage slot.
     */
    function denyMinter(address _minter, address[] calldata _helpers, string calldata _message) external override {
        if (block.timestamp > minters[_minter]) revert TooLate();
        reserve.checkQualified(msg.sender, _helpers);
        delete minters[_minter];
        emit MinterDenied(_minter, _message);
    }

    /**
     * @notice Mints the provided amount of ZCHF to the target address, automatically forwarding
     * the minting fee and the reserve to the right place.
     */
    function mintWithReserve(
        address _target,
        uint256 _amount,
        uint32 _reservePPM,
        uint32 _feesPPM
    ) external override minterOnly {
        uint256 usableMint = (_amount * (1000_000 - _feesPPM - _reservePPM)) / 1000_000; // rounding down is fine
        _mint(_target, usableMint);
        _mint(address(reserve), _amount - usableMint); // rest goes to equity as reserves or as fees
        minterReserveE6 += _amount * _reservePPM;
        emit Profit(msg.sender, (_feesPPM * _amount) / 1000_000);
    }

    function mint(address _target, uint256 _amount) external override minterOnly {
        _mint(_target, _amount);
    }

    /**
     * Anyone is allowed to burn their ZCHF.
     */
    function burn(uint256 _amount) external {
        _burn(msg.sender, _amount);
    }

    /**
     * @notice Burn someone elses ZCHF.
     */
    function burnFrom(address _owner, uint256 _amount) external override minterOnly {
        _burn(_owner, _amount);
    }

    /**
     * @notice Burn that amount without reclaiming the reserve, but freeing it up and thereby essentially donating it to the
     * pool share holders. This can make sense in combination with 'coverLoss', i.e. when it is the pool share
     * holders that bear the risk and depending on the outcome they make a profit or a loss.
     *
     * Design rule: Minters calling this method are only allowed to so for tokens amounts they previously minted with
     * the same _reservePPM amount.
     *
     * For example, if someone minted 50 ZCHF earlier with a 20% reserve requirement (200000 ppm), they got 40 ZCHF
     * and paid 10 ZCHF into the reserve. Now they want to repay the debt by burning 50 ZCHF. When doing so using this
     * method, 50 ZCHF get burned and on top of that, 10 ZCHF previously assigned to the minter's reserved are
     * reassigned to the pool share holders.
     */
    function burnWithoutReserve(uint256 amount, uint32 reservePPM) public override minterOnly {
        _burn(msg.sender, amount);
        uint256 reserveReduction = amount * reservePPM;
        if (reserveReduction > minterReserveE6) {
            emit Profit(msg.sender, minterReserveE6 / 1000_000);
            minterReserveE6 = 0; // should never happen, but we want robust behavior in case it does
        } else {
            minterReserveE6 -= reserveReduction;
            emit Profit(msg.sender, reserveReduction / 1000_000);
        }
    }

    /**
     * @notice Burns the provided number of tokens plus whatever reserves are associated with that amount given the reserve
     * requirement. The caller is only allowed to use this method for tokens also minted through the caller with the
     * same _reservePPM amount.
     *
     * Example: the calling contract has previously minted 100 ZCHF with a reserve ratio of 20% (i.e. 200000 ppm).
     * Now they have 41 ZCHF that they do not need so they decide to repay that amount. Assuming the reserves are
     * only 90% covered, the call to burnWithReserve will burn the 41 plus 9 from the reserve, reducing the outstanding
     * 'debt' of the caller by 50 ZCHF in total. This total is returned by the method so the caller knows how much less
     * they owe.
     */
    function burnWithReserve(
        uint256 _amountExcludingReserve,
        uint32 _reservePPM
    ) external override minterOnly returns (uint256) {
        uint256 freedAmount = calculateFreedAmount(_amountExcludingReserve, _reservePPM); // 50 in the example
        minterReserveE6 -= freedAmount * _reservePPM; // reduce reserve requirements by original ratio
        _transfer(address(reserve), msg.sender, freedAmount - _amountExcludingReserve); // collect assigned reserve
        _burn(msg.sender, freedAmount); // burn the rest of the freed amount
        return freedAmount;
    }

    /**
     * @notice Burns the target amount taking the tokens to be burned from the payer and the payer's reserve.
     * Only use this method for tokens also minted by the caller with the same _reservePPM.
     *
     * Example: the calling contract has previously minted 100 ZCHF with a reserve ratio of 20% (i.e. 200000 ppm).
     * To burn half of that again, the minter calls burnFrom with a target amount of 50 ZCHF. Assuming that reserves
     * are only 90% covered, this call will deduct 41 ZCHF from the payer's balance and 9 from the reserve, while
     * reducing the minter reserve by 10.
     */
    function burnFromWithReserve(
        address payer,
        uint256 targetTotalBurnAmount,
        uint32 reservePPM
    ) external override minterOnly returns (uint256) {
        uint256 assigned = calculateAssignedReserve(targetTotalBurnAmount, reservePPM);
        _transfer(address(reserve), payer, assigned); // send reserve to owner
        _burn(payer, targetTotalBurnAmount); // and burn the full amount from the owner's address
        minterReserveE6 -= targetTotalBurnAmount * reservePPM; // reduce reserve requirements by original ratio
        return assigned;
    }

    /**
     * @notice Calculates the reserve attributable to someone who minted the given amount with the given reserve requirement.
     * Under normal circumstances, this is just the reserver requirement multiplied by the amount. However, after a
     * severe loss of capital that burned into the minter's reserve, this can also be less than that.
     */
    function calculateAssignedReserve(uint256 mintedAmount, uint32 _reservePPM) public view returns (uint256) {
        uint256 theoreticalReserve = (_reservePPM * mintedAmount) / 1000000;
        uint256 currentReserve = balanceOf(address(reserve));
        uint256 minterReserve_ = minterReserve();
        if (currentReserve < minterReserve_) {
            // not enough reserves, owner has to take a loss
            return (theoreticalReserve * currentReserve) / minterReserve_;
        } else {
            return theoreticalReserve;
        }
    }

    /**
     * @notice Calculate the amount that is freed when returning amountExcludingReserve given a reserve ratio of reservePPM,
     * taking into account potential losses. Example values in the comments.
     */
    function calculateFreedAmount(
        uint256 amountExcludingReserve /* 41 */,
        uint32 reservePPM /* 20% */
    ) public view returns (uint256) {
        uint256 currentReserve = balanceOf(address(reserve)); // 18, 10% below what we should have
        uint256 minterReserve_ = minterReserve(); // 20
        uint256 adjustedReservePPM = currentReserve < minterReserve_
            ? (reservePPM * currentReserve) / minterReserve_
            : reservePPM; // 18%
        return (1000000 * amountExcludingReserve) / (1000000 - adjustedReservePPM); // 41 / (1-18%) = 50
    }

    /**
     * @notice Notify the Frankencoin that a minter lost economic access to some coins. This does not mean that the coins are
     * literally lost. It just means that some ZCHF will likely never be repaid and that in order to bring the system
     * back into balance, the lost amount of ZCHF must be removed from the reserve instead.
     *
     * For example, if a minter printed 1 million ZCHF for a mortgage and the mortgage turned out to be unsound with
     * the house only yielding 800'000 in the subsequent auction, there is a loss of 200'000 that needs to be covered
     * by the reserve.
     */
    function coverLoss(address source, uint256 _amount) external override minterOnly {
        uint256 reserveLeft = balanceOf(address(reserve));
        if (reserveLeft >= _amount) {
            _transfer(address(reserve), source, _amount);
        } else {
            _transfer(address(reserve), source, reserveLeft);
            _mint(source, _amount - reserveLeft);
        }
        emit Loss(source, _amount);
    }

    function collectProfits(address source, uint256 _amount) external override minterOnly {
        _collectProfits(msg.sender, source, _amount);
    }

    function _collectProfits(address minter, address source, uint256 _amount) internal {
        _transfer(source, address(reserve), _amount);
        emit Profit(minter, _amount);
    }

    /**
     * @notice Returns true if the address is an approved minter.
     */
    function isMinter(address _minter) public view override returns (bool) {
        return minters[_minter] != 0 && block.timestamp >= minters[_minter];
    }

    /**
     * @notice Returns the address of the minter that created this position or null if the provided address is unknown.
     */
    function getPositionParent(address _position) public view override returns (address) {
        return positions[_position];
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./Frankencoin.sol";
import "./utils/MathUtil.sol";
import "./interface/IReserve.sol";
import "./interface/IERC677Receiver.sol";

/**
 * @title Equity
 * @notice If the Frankencoin system was a bank, this contract would represent the equity on its balance sheet.
 * Like with a corporation, the owners of the equity capital are the shareholders, or in this case the holders
 * of Frankencoin Pool Shares (FPS) tokens. Anyone can mint additional FPS tokens by adding Frankencoins to the
 * reserve pool. Also, FPS tokens can be redeemed for Frankencoins again after a minimum holding period.
 * Furthermore, the FPS shares come with some voting power. Anyone that held at least 3% of the holding-period-
 * weighted reserve pool shares gains veto power and can veto new proposals.
 */
contract Equity is ERC20PermitLight, MathUtil, IReserve {
    /**
     * The VALUATION_FACTOR determines the market cap of the reserve pool shares relative to the equity reserves.
     * The following always holds: Market Cap = Valuation Factor * Equity Reserve = Price * Supply
     *
     * In the absence of profits and losses, the variables grow as follows when FPS tokens are minted:
     *
     * |   Reserve     |   Market Cap  |     Price     |     Supply   |
     * |          1000 |          3000 |             3 |         1000 |
     * |       1000000 |       3000000 |           300 |        10000 |
     * |    1000000000 |    3000000000 |         30000 |       100000 |
     * | 1000000000000 | 3000000000000 |       3000000 |      1000000 |
     *
     * I.e., the supply is proporational to the cubic root of the reserve and the price is proportional to the
     * squared cubic root. When profits accumulate or losses materialize, the reserve, the market cap,
     * and the price are adjusted proportionally, with the supply staying constant. In the absence of an extreme
     * inflation of the Swiss franc, it is unlikely that there will ever be more than ten million FPS.
     */
    uint32 public constant VALUATION_FACTOR = 3;

    uint256 private constant MINIMUM_EQUITY = 1000 * ONE_DEC18;

    /**
     * @notice The quorum in basis points. 100 is 1%.
     */
    uint32 private constant QUORUM = 200;

    /**
     * @notice The number of digits to store the average holding time of share tokens.
     */
    uint8 private constant TIME_RESOLUTION_BITS = 20;

    /**
     * @notice The minimum holding duration. You are not allowed to redeem your pool shares if you held them
     * for less than the minimum holding duration at average. For example, if you have two pool shares on your
     * address, one acquired 5 days ago and one acquired 105 days ago, you cannot redeem them as the average
     * holding duration of your shares is only 55 days < 90 days.
     */
    uint256 public constant MIN_HOLDING_DURATION = 90 days << TIME_RESOLUTION_BITS; // Set to 5 for local testing

    Frankencoin public immutable zchf;

    /**
     * @dev To track the total number of votes we need to know the number of votes at the anchor time and when the
     * anchor time was. This is (hopefully) stored in one 256 bit slot, with the anchor time taking 64 Bits and
     * the total vote count 192 Bits. Given the sub-second resolution of 20 Bits, the implicit assumption is
     * that the timestamp can always be stored in 44 Bits (i.e. it does not exceed half a million years). Further,
     * given 18 decimals (about 60 Bits), this implies that the total supply cannot exceed
     *   192 - 60 - 44 - 20 = 68 Bits
     * Here, we are also save, as 68 Bits would imply more than a trillion outstanding shares. In fact,
     * a limit of about 2**36 shares (that's about 2**96 Bits when taking into account the decimals) is imposed
     * when minting. This means that the maximum supply is billions shares, which is could only be reached in
     * a scenario with hyper inflation, in which case the stablecoin is worthless anyway.
     */
    uint192 private totalVotesAtAnchor; // Total number of votes at the anchor time, see comment on the um
    uint64 private totalVotesAnchorTime; // 44 Bit for the time stamp, 20 Bit sub-second time resolution

    /**
     * @notice Keeping track on who delegated votes to whom.
     * Note that delegation does not mean you cannot vote / veto any more, it just means that the delegate can
     * benefit from your votes when invoking a veto. Circular delegations are valid, do not help when voting.
     */
    mapping(address owner => address delegate) public delegates;

    /**
     * @notice A time stamp in the past such that: votes = balance * (time passed since anchor was set)
     */
    mapping(address owner => uint64 timestamp) private voteAnchor; // 44 bits for time stamp, 20 subsecond resolution

    event Delegation(address indexed from, address indexed to); // indicates a delegation
    event Trade(address who, int amount, uint totPrice, uint newprice); // amount pos or neg for mint or redemption

    constructor(Frankencoin zchf_) ERC20(18) {
        zchf = zchf_;
    }

    function name() external pure override returns (string memory) {
        return "Frankencoin Pool Share";
    }

    function symbol() external pure override returns (string memory) {
        return "FPS";
    }

    /**
     * @notice Returns the price of one FPS in ZCHF with 18 decimals precision.
     */
    function price() public view returns (uint256) {
        uint256 equity = zchf.equity();
        if (equity == 0 || totalSupply() == 0) {
            return ONE_DEC18; // initial price is 1000 ZCHF for the first 1000 FPS
        } else {
            return (VALUATION_FACTOR * zchf.equity() * ONE_DEC18) / totalSupply();
        }
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override {
        super._beforeTokenTransfer(from, to, amount);
        if (amount > 0) {
            // No need to adjust the sender votes. When they send out 10% of their shares, they also lose 10% of
            // their votes so everything falls nicely into place. Recipient votes should stay the same, but grow
            // faster in the future, requiring an adjustment of the anchor.
            uint256 roundingLoss = _adjustRecipientVoteAnchor(to, amount);
            // The total also must be adjusted and kept accurate by taking into account the rounding error.
            _adjustTotalVotes(from, amount, roundingLoss);
        }
    }

    /**
     * @notice Returns whether the given address is allowed to redeem FPS, which is the
     * case after their average holding duration is larger than the required minimum.
     */
    function canRedeem(address owner) public view returns (bool) {
        return _anchorTime() - voteAnchor[owner] >= MIN_HOLDING_DURATION;
    }

    /**
     * @notice Decrease the total votes anchor when tokens lose their voting power due to being moved
     * @param from      sender
     * @param amount    amount to be sent
     */
    function _adjustTotalVotes(address from, uint256 amount, uint256 roundingLoss) internal {
        uint64 time = _anchorTime();
        uint256 lostVotes = from == address(0x0) ? 0 : (time - voteAnchor[from]) * amount;
        totalVotesAtAnchor = uint192(totalVotes() - roundingLoss - lostVotes);
        totalVotesAnchorTime = time;
    }

    /**
     * @notice the vote anchor of the recipient is moved forward such that the number of calculated
     * votes does not change despite the higher balance.
     * @param to        receiver address
     * @param amount    amount to be received
     * @return the number of votes lost due to rounding errors
     */
    function _adjustRecipientVoteAnchor(address to, uint256 amount) internal returns (uint256) {
        if (to != address(0x0)) {
            uint256 recipientVotes = votes(to); // for example 21 if 7 shares were held for 3 seconds
            uint256 newbalance = balanceOf(to) + amount; // for example 11 if 4 shares are added
            // new example anchor is only 21 / 11 = 1 second in the past
            voteAnchor[to] = uint64(_anchorTime() - recipientVotes / newbalance);
            return recipientVotes % newbalance; // we have lost 21 % 11 = 10 votes
        } else {
            // optimization for burn, vote anchor of null address does not matter
            return 0;
        }
    }

    /**
     * @notice Time stamp with some additional bits for higher resolution.
     */
    function _anchorTime() internal view returns (uint64) {
        return uint64(block.timestamp << TIME_RESOLUTION_BITS);
    }

    /**
     * @notice The relative voting power of the address.
     * @return A percentage with 1e18 being 100%
     */
    function relativeVotes(address holder) external view returns (uint256) {
        return (ONE_DEC18 * votes(holder)) / totalVotes();
    }

    /**
     * @notice The votes of the holder, excluding votes from delegates.
     */
    function votes(address holder) public view returns (uint256) {
        return balanceOf(holder) * (_anchorTime() - voteAnchor[holder]);
    }

    /**
     * @notice How long the holder already held onto their average FPS in seconds.
     */
    function holdingDuration(address holder) public view returns (uint256) {
        return (_anchorTime() - voteAnchor[holder]) >> TIME_RESOLUTION_BITS;
    }

    /**
     * @notice Total number of votes in the system.
     */
    function totalVotes() public view returns (uint256) {
        return totalVotesAtAnchor + totalSupply() * (_anchorTime() - totalVotesAnchorTime);
    }

    /**
     * @notice The number of votes the sender commands when taking the support of the helpers into account.
     * @param sender    The address whose total voting power is of interest
     * @param helpers   An incrementally sorted list of helpers without duplicates and without the sender.
     *                  The call fails if the list contains an address that does not delegate to sender.
     *                  For indirect delegates, i.e. a -> b -> c, both a and b must be included for both to count.
     * @return          The total number of votes of sender at the current point in time.
     */
    function votesDelegated(address sender, address[] calldata helpers) public view returns (uint256) {
        uint256 _votes = votes(sender);
        require(_checkDuplicatesAndSorted(helpers));
        for (uint i = 0; i < helpers.length; i++) {
            address current = helpers[i];
            require(current != sender);
            require(_canVoteFor(sender, current));
            _votes += votes(current);
        }
        return _votes;
    }

    function _checkDuplicatesAndSorted(address[] calldata helpers) internal pure returns (bool ok) {
        if (helpers.length <= 1) {
            return true;
        } else {
            address prevAddress = helpers[0];
            for (uint i = 1; i < helpers.length; i++) {
                if (helpers[i] <= prevAddress) {
                    return false;
                }
                prevAddress = helpers[i];
            }
            return true;
        }
    }

    /**
     * @notice Checks whether the sender address is qualified given a list of helpers that delegated their votes
     * directly or indirectly to the sender. It is the responsiblity of the caller to figure out whether
     * helpes are necessary and to identify them by scanning the blockchain for Delegation events.
     */
    function checkQualified(address sender, address[] calldata helpers) public view override {
        uint256 _votes = votesDelegated(sender, helpers);
        if (_votes * 10000 < QUORUM * totalVotes()) revert NotQualified();
    }

    error NotQualified();

    /**
     * @notice Increases the voting power of the delegate by your number of votes without taking away any voting power
     * from the sender.
     */
    function delegateVoteTo(address delegate) external {
        delegates[msg.sender] = delegate;
        emit Delegation(msg.sender, delegate);
    }

    function _canVoteFor(address delegate, address owner) internal view returns (bool) {
        if (owner == delegate) {
            return true;
        } else if (owner == address(0x0)) {
            return false;
        } else {
            return _canVoteFor(delegate, delegates[owner]);
        }
    }

    /**
     * @notice Since quorum is rather low, it is important to have a way to prevent malicious minority holders
     * from blocking the whole system. This method provides a way for the good guys to team up and destroy
     * the bad guy's votes (at the cost of also reducing their own votes). This mechanism potentially
     * gives full control over the system to whoever has 51% of the votes.
     *
     * Since this is a rather aggressive measure, delegation is not supported. Every holder must call this
     * method on their own.
     * @param targets   The target addresses to remove votes from
     * @param votesToDestroy    The maximum number of votes the caller is willing to sacrifice
     */
    function kamikaze(address[] calldata targets, uint256 votesToDestroy) external {
        uint256 budget = _reduceVotes(msg.sender, votesToDestroy);
        uint256 destroyedVotes = 0;
        for (uint256 i = 0; i < targets.length && destroyedVotes < budget; i++) {
            destroyedVotes += _reduceVotes(targets[i], budget - destroyedVotes);
        }
        require(destroyedVotes > 0); // sanity check
        totalVotesAtAnchor = uint192(totalVotes() - destroyedVotes - budget);
        totalVotesAnchorTime = _anchorTime();
    }

    function _reduceVotes(address target, uint256 amount) internal returns (uint256) {
        uint256 votesBefore = votes(target);
        if (amount >= votesBefore) {
            amount = votesBefore;
            voteAnchor[target] = _anchorTime();
            return votesBefore;
        } else {
            voteAnchor[target] = uint64(_anchorTime() - (votesBefore - amount) / balanceOf(target));
            return votesBefore - votes(target);
        }
    }

    /**
     * @notice Call this method to obtain newly minted pool shares in exchange for Frankencoins.
     * No allowance required (i.e. it is hardcoded in the Frankencoin token contract).
     * Make sure to invest at least 10e-12 * market cap to avoid rounding losses.
     *
     * @dev If equity is close to zero or negative, you need to send enough ZCHF to bring equity back to 1000 ZCHF.
     *
     * @param amount            Frankencoins to invest
     * @param expectedShares    Minimum amount of expected shares for frontrunning protection
     */
    function invest(uint256 amount, uint256 expectedShares) external returns (uint256) {
        zchf.transferFrom(msg.sender, address(this), amount);
        uint256 equity = zchf.equity();
        require(equity >= MINIMUM_EQUITY, "insuf equity"); // ensures that the initial deposit is at least 1000 ZCHF

        uint256 shares = _calculateShares(equity <= amount ? 0 : equity - amount, amount);
        require(shares >= expectedShares);
        _mint(msg.sender, shares);
        emit Trade(msg.sender, int(shares), amount, price());

        // limit the total supply to a reasonable amount to guard against overflows with price and vote calculations
        // the 36 bits are 68 bits for magnitude and 60 bits for precision, as calculated in an above comment
        require(totalSupply() <= type(uint96).max, "total supply exceeded");
        return shares;
    }

    /**
     * @notice Calculate shares received when investing Frankencoins
     * @param investment    ZCHF to be invested
     * @return shares to be received in return
     */
    function calculateShares(uint256 investment) external view returns (uint256) {
        return _calculateShares(zchf.equity(), investment);
    }

    function _calculateShares(uint256 capitalBefore, uint256 investment) internal view returns (uint256) {
        uint256 totalShares = totalSupply();
        uint256 investmentExFees = (investment * 997) / 1000; // remove 0.3% fee
        // Assign 1000 FPS for the initial deposit, calculate the amount otherwise
        uint256 newTotalShares = capitalBefore < MINIMUM_EQUITY || totalShares == 0
            ? totalShares + 1000 * ONE_DEC18
            : _mulD18(totalShares, _cubicRoot(_divD18(capitalBefore + investmentExFees, capitalBefore)));
        return newTotalShares - totalShares;
    }

    /**
     * @notice Redeem the given amount of shares owned by the sender and transfer the proceeds to the target.
     * @return The amount of ZCHF transferred to the target
     */
    function redeem(address target, uint256 shares) external returns (uint256) {
        return _redeemFrom(msg.sender, target, shares);
    }

    /**
     * @notice Like redeem(...), but with an extra parameter to protect against frontrunning.
     * @param expectedProceeds  The minimum acceptable redemption proceeds.
     */
    function redeemExpected(address target, uint256 shares, uint256 expectedProceeds) external returns (uint256) {
        uint256 proceeds = _redeemFrom(msg.sender, target, shares);
        require(proceeds >= expectedProceeds);
        return proceeds;
    }

    /**
     * @notice Redeem FPS based on an allowance from the owner to the caller.
     * See also redeemExpected(...).
     */
    function redeemFrom(
        address owner,
        address target,
        uint256 shares,
        uint256 expectedProceeds
    ) external returns (uint256) {
        _useAllowance(owner, msg.sender, shares);
        uint256 proceeds = _redeemFrom(owner, target, shares);
        require(proceeds >= expectedProceeds);
        return proceeds;
    }

    function _redeemFrom(address owner, address target, uint256 shares) internal returns (uint256) {
        require(canRedeem(owner));
        uint256 proceeds = calculateProceeds(shares);
        _burn(owner, shares);
        zchf.transfer(target, proceeds);
        emit Trade(owner, -int(shares), proceeds, price());
        return proceeds;
    }

    /**
     * @notice Calculate ZCHF received when depositing shares
     * @param shares number of shares we want to exchange for ZCHF,
     *               in dec18 format
     * @return amount of ZCHF received for the shares
     */
    function calculateProceeds(uint256 shares) public view returns (uint256) {
        uint256 totalShares = totalSupply();
        require(shares + ONE_DEC18 < totalShares, "too many shares"); // make sure there is always at least one share
        uint256 capital = zchf.equity();
        uint256 reductionAfterFees = (shares * 997) / 1000;
        uint256 newCapital = _mulD18(capital, _power3(_divD18(totalShares - reductionAfterFees, totalShares)));
        return capital - newCapital;
    }

    /**
     * @notice If there is less than 1000 ZCHF in equity left (maybe even negative), the system is at risk
     * and we should allow qualified FPS holders to restructure the system.
     *
     * Example: there was a devastating loss and equity stands at -1'000'000. Most shareholders have lost hope in the
     * Frankencoin system except for a group of small FPS holders who still believes in it and is willing to provide
     * 2'000'000 ZCHF to save it. These brave souls are essentially donating 1'000'000 to the minter reserve and it
     * would be wrong to force them to share the other million with the passive FPS holders. Instead, they will get
     * the possibility to bootstrap the system again owning 100% of all FPS shares.
     *
     * @param helpers          A list of addresses that delegate to the caller in incremental order
     * @param addressesToWipe  A list of addresses whose FPS will be burned to zero
     */
    function restructureCapTable(address[] calldata helpers, address[] calldata addressesToWipe) external {
        require(zchf.equity() < MINIMUM_EQUITY);
        checkQualified(msg.sender, helpers);
        for (uint256 i = 0; i < addressesToWipe.length; i++) {
            address current = addressesToWipe[i];
            _burn(current, balanceOf(current));
        }
    }
}

/**
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2016-2019 zOS Global Limited
 *
 */
pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */

interface IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    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 always true. Throws error on failure.
     *
     * 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 can change 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.
     *
     * > 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 always true. Throws error on failure.
     *
     * Emits a `Transfer` event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

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

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

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IERC677Receiver {
    
    function onTokenTransfer(address from, uint256 amount, bytes calldata data) external returns (bool);

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./IReserve.sol";

interface IFrankencoin is IERC20 {
    function suggestMinter(address _minter, uint256 _applicationPeriod, uint256 _applicationFee, string calldata _message) external;

    function registerPosition(address position) external;

    function denyMinter(address minter, address[] calldata helpers, string calldata message) external;

    function reserve() external view returns (IReserve);

    function minterReserve() external view returns (uint256);

    function calculateAssignedReserve(uint256 mintedAmount, uint32 _reservePPM) external view returns (uint256);

    function equity() external view returns (uint256);

    function isMinter(address minter) external view returns (bool);

    function getPositionParent(address position) external view returns (address);

    function mint(address target, uint256 amount) external;

    function mintWithReserve(address target, uint256 amount, uint32 reservePPM, uint32 feePPM) external;

    function burnFrom(address target, uint256 amount) external;

    function burnWithoutReserve(uint256 amountIncludingReserve, uint32 reservePPM) external;

    function burnFromWithReserve(address payer, uint256 targetTotalBurnAmount, uint32 _reservePPM) external returns (uint256);

    function burnWithReserve(uint256 amountExcludingReserve, uint32 reservePPM) external returns (uint256);

    function coverLoss(address source, uint256 amount) external;

    function collectProfits(address source, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IERC20.sol";

interface IReserve is IERC20 {
   function invest(uint256 amount, uint256 expected) external returns (uint256);
   function checkQualified(address sender, address[] calldata helpers) external view;
}

// SPDX-License-Identifier: MIT
// Copied and adjusted from OpenZeppelin
// Adjustments:
// - modifications to support ERC-677
// - removed require messages to save space
// - removed unnecessary require statements
// - removed GSN Context
// - upgraded to 0.8 to drop SafeMath
// - let name() and symbol() be implemented by subclass
// - infinite allowance support, with 2^255 and above considered infinite

pragma solidity ^0.8.0;

import "../interface/IERC20.sol";
import "../interface/IERC677Receiver.sol";

/**
 * @dev Implementation of the `IERC20` interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using `_mint`.
 * For a generic mechanism see `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 */

abstract contract ERC20 is IERC20 {
    mapping(address account => uint256 balance) private _balances;

    mapping(address account => mapping(address spender => uint256 allowance)) private _allowances;

    uint256 internal constant INFINITY = (1 << 255);

    uint256 private _totalSupply;

    uint8 public immutable override decimals;

    // Copied from https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4139/files#diff-fa792f7d08644eebc519dac2c29b00a54afc4c6a76b9ef3bba56c8401fe674f6
    // Indicates an error related to the current balance of a sender. Used in transfers.
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);
    // Indicates a failure with the spender’s allowance. Used in transfers.
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    constructor(uint8 _decimals) {
        decimals = _decimals;
    }

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

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

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

    /**
     * @dev See `IERC20.allowance`.
     */
    function allowance(address owner, address spender) external view override returns (uint256) {
        return _allowance(owner, spender);
    }

    function _allowance(address owner, address spender) internal view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

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

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

    function _useAllowance(address owner, address spender, uint256 amount) internal {
        uint256 currentAllowance = _allowance(owner, spender);
        if (currentAllowance < INFINITY) {
            // Only decrease the allowance if it was not set to 'infinite'
            // Documented in github.com/aktionariat/contracts/blob/master/doc/infiniteallowance.md
            if (currentAllowance < amount) revert ERC20InsufficientAllowance(owner, currentAllowance, amount);
            _approve(owner, spender, currentAllowance - amount);
        }
    }

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

        _beforeTokenTransfer(sender, recipient, amount);
        if (_balances[sender] < amount) revert ERC20InsufficientBalance(sender, _balances[sender], amount);
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
    }

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

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

        _totalSupply += amount;
        _balances[recipient] += amount;
        emit Transfer(address(0), recipient, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a `Transfer` event with `to` set to the zero address.
     */
    function _burn(address account, uint256 amount) internal virtual {
        _beforeTokenTransfer(account, address(0), amount);

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

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an `Approval` event.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

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

// SPDX-License-Identifier: MIT
// Copied from https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol
// and modified it.

pragma solidity ^0.8.0;

import "./ERC20.sol";

abstract contract ERC20PermitLight is ERC20 {
    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(address account => uint256 nonce) public nonces;

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        unchecked {
            // unchecked to save a little gas with the nonce increment...
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"),
                                bytes32(0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");
            _approve(recoveredAddress, spender, value);
        }
    }

    function DOMAIN_SEPARATOR() public view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    //keccak256("EIP712Domain(uint256 chainId,address verifyingContract)");
                    bytes32(0x47e79534a245952e8b16893a336b85a3d9ea9fa8c573f3d803afb92a79469218),
                    block.chainid,
                    address(this)
                )
            );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Functions for share valuation
 */
contract MathUtil {
    uint256 internal constant ONE_DEC18 = 10 ** 18;

    // Let's go for 12 digits of precision (18-6)
    uint256 internal constant THRESH_DEC18 = 10 ** 6;

    /**
     * @notice Cubic root with Halley approximation
     *         Number 1e18 decimal
     * @param _v     number for which we calculate x**(1/3)
     * @return returns _v**(1/3)
     */
    function _cubicRoot(uint256 _v) internal pure returns (uint256) {
        // Good first guess for _v slightly above 1.0, which is often the case in the Frankencoin system
        uint256 x = _v > ONE_DEC18 && _v < 10 ** 19 ? (_v - ONE_DEC18) / 3 + ONE_DEC18 : ONE_DEC18;
        uint256 diff;
        do {
            uint256 powX3 = _mulD18(_mulD18(x, x), x);
            uint256 xnew = x * (powX3 + 2 * _v) / (2 * powX3 + _v);
            diff = xnew > x ? xnew - x : x - xnew;
            x = xnew;
        } while (diff > THRESH_DEC18);
        return x;
    }

    function _mulD18(uint256 _a, uint256 _b) internal pure returns (uint256) {
        return (_a * _b) / ONE_DEC18;
    }

    function _divD18(uint256 _a, uint256 _b) internal pure returns (uint256) {
        return (_a * ONE_DEC18) / _b;
    }

    function _power3(uint256 _x) internal pure returns (uint256) {
        return _mulD18(_mulD18(_x, _x), _x);
    }

    function _min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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0000000000000000000000000000000000000000000000000000000000127500

-----Decoded View---------------
Arg [0] : _minApplicationPeriod (uint256): 1209600

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000127500