// File: src/SubscriptionManagerV2.sol



/**
 * Nchart Subscription Manager
 *
 * Website: nchart.io | kekotron.io
 * Docs: docs.nchart.io
 * Manual: docs.kekotron.io
 * twitter.com/Nchart_
 * twitter.com/Kekotron_
 */

// SPDX-License-Identifier: MIT
pragma solidity 0.8.21;

import "@solady/auth/OwnableRoles.sol";
import "@solady/utils/LibMap.sol";
import {Nchart} from "./Nchart.sol";
import "./IUniswapV2Router02.sol";

/**
 *             ........
 *         ..::::::::::::.  .
 *       .:::::::::::::::.  =+-.
 *     --::::::::::::::::.  =+++-
 *    *##*+::::::::::::::.  =+++++
 *   *#####:  .::::::::::.  =++++++
 *  -######:     .:::::::.  =++++++-
 *  *######:  :.    .::::.  =+++++++
 *  #######:  -=-:.    .:.  =+++++++
 *  +######:  -=====:.      =++++++=
 *  :######:  -========-.   =++++++:
 *   +#####:  -===========-.-+++++=
 *    =####:  -==============-==+-
 *     :*##:  -================-.
 *       :+:  -==============-.
 *            :==========-:.
 *               ......
 *
 *
 * @dev Contract which accepts ETH to pay for a subscription, which is used to buy and burn CHART from
 * @dev the UniswapV2 LP Pool.  This contract also includes a staking mechanism for users to stake CHART
 * @dev and grant a subscription in return.
 */
contract SubscriptionManager is OwnableRoles {
    struct StakingInfo {
        address staker;
        uint40 stakeLength;
        uint40 stakingExpirationTimestamp;
        uint256 stakedAmount;
    }

    struct StakingConfig {
        /// @notice Subscription length granted for staking CHART
        uint40 stakeSubscriptionLength;
        /// @notice Minimum length of time to stake CHART
        uint40 minStakingLength;
        /// @notice Maximum length of time to stake CHART
        uint40 maxStakingLength;
        /// @notice Minimum amount of CHART required to stake
        uint256 minStakingAmount;
        /// @notice Step amount to reduce CHART required to stake based on stake length
        uint256 step;
    }

    uint40 internal constant MAX_UINT40 = type(uint40).max;
    uint256 public constant KEEPER_ROLE = uint256(1);

    Nchart public immutable chart;
    IUniswapV2Router02 public immutable router;

    LibMap.Uint40Map private expiration;
    mapping(address => StakingInfo) private staking;

    StakingConfig public stakingConfig = StakingConfig({
        stakeSubscriptionLength: 30 days * 6, // 6 months
        minStakingAmount: 2000 * 1 ether,
        minStakingLength: 30 days * 6, // 6 months
        maxStakingLength: 730 days, // 2 years
        step: 8333
    });

    uint256 public subscriptionPrice = 0.015 ether; // Price is 0.015e to start
    uint40 public subscriptionLength; // Lifetime subscription to start
    // Percent of fees to use to buy and burn CHART
    uint8 public burnPercent = 99;
    // Percent of fees to send to referrer if they have an active subscription
    uint8 public referralPercent = 5;

    event BurnPercentUpdated(uint8 newPercent, uint8 oldPercent);
    event ReferralPaid(address indexed referrer, uint256 amount);
    event ReferralPercentUpdated(uint8 newPercent, uint8 oldPercent);
    event Restaked(address indexed subscriberAddress, uint256 amount);
    event Staked(address indexed subscriberAddress, uint40 stakeLength, uint256 chartPerAccount, uint40 stakingExpirationTimestamp);
    event SubscriptionLengthUpdated(uint256 newLength, uint256 oldLength);
    event SubscriptionPaid(address indexed subscriber, uint40 expirationTimestamp, uint256 price);
    event SubscriptionPriceUpdated(uint256 newPrice, uint256 oldPrice);
    event Unstaked(address indexed subscriberAddress, uint256 amount);

    error SubscriptionManager__BurnPercentMustBeGreaterThan50();
    error SubscriptionManager__BurnPercentMustBeLessThan100();
    error SubscriptionManager__CannotReferSelf();
    error SubscriptionManager__CannotRegisterAddressZero();
    error SubscriptionManager__CannotRestakeForAccountsWithMoreThanOneMonthRemaining();
    error SubscriptionManager__CannotRestakeForAccountsWithoutStake();
    error SubscriptionManager__CannotStakeForAccountsWithCurrentSubscription();
    error SubscriptionManager__CannotUnstakeForAccountsWithActiveStake();
    error SubscriptionManager__CannotUnstakeForAccountsWithoutStake();
    error SubscriptionManager__CanOnlyIncreaseExpiration();
    error SubscriptionManager__ErrorRetrievingPriceFromDataFeed();
    error SubscriptionManager__ErrorSendingKeeperFunds();
    error SubscriptionManager__InvalidETHAmountProvided(uint256 msgValue, uint256 ethRequired);
    error SubscriptionManager__MaxFiftyPercentReferralPercent();
    error SubscriptionManager__MustBeStakerToRestake();
    error SubscriptionManager__MustBeStakerToUnstake();
    error SubscriptionManager__MustProvideAtLeastOneAddress();
    error SubscriptionManager__MustProvideEqualLengthArrays();
    error SubscriptionManager__OnlyOwner();
    error SubscriptionManager__StakeLengthGreaterThanMaximumLength();
    error SubscriptionManager__StakeLengthLessThanMinimumLength();
    error SubscriptionManager__UseRegisterAddressesFunction();

    constructor(address payable chart_, address owner_, address router_) {
        _initializeOwner(owner_);
        chart = Nchart(chart_);
        router = IUniswapV2Router02(router_);
    }

    receive() external payable {
        revert SubscriptionManager__UseRegisterAddressesFunction();
    }

    fallback() external payable {
        revert SubscriptionManager__UseRegisterAddressesFunction();
    }

    /**
     * @notice Sets the length of the subscription period.
     *
     * @dev    The subscription length is either added to the remaining time of a user's subscription or block.timestamp if unset
     * @dev    Passing in a value of 0 will set the subscription to unlimited, and expiration will be set to MAX_UINT40
     * @dev    - Throws if caller is not owner
     *
     * @dev    On completion:
     * @dev    - `subscriptionLength` = `newSubscriptionLength`
     * @dev    - Emits {SubscriptionLengthUpdated} event
     *
     * @param  newSubscriptionLength Length to update future subscriptions to
     */
    function setSubscriptionLength(uint40 newSubscriptionLength) external {
        _requireIsOwner();

        uint40 oldSubscriptionLength = subscriptionLength;
        subscriptionLength = newSubscriptionLength;
        emit SubscriptionLengthUpdated(newSubscriptionLength, oldSubscriptionLength);
    }

    /**
     * @notice Sets the percentage of fees to send to referrers if they have an active subscription
     *
     * @dev    - Throws if `msg.sender` != `owner()`
     * @dev    - Throws if provided percent is > 5
     *
     * @dev    On completion:
     * @dev    - `referralPercent` = `newPercent`
     * @dev    - Emits {ReferralPercentUpdated} event
     *
     * @param newPercent Percentage of fees to send to referrers
     */
    function setReferralPercent(uint8 newPercent) external {
        _requireIsOwner();

        if (newPercent > 50) {
            revert SubscriptionManager__MaxFiftyPercentReferralPercent();
        }

        uint8 oldPercent = referralPercent;
        referralPercent = newPercent;
        emit ReferralPercentUpdated(newPercent, oldPercent);
    }

    /**
     * @notice Sets the price of new subscriptions.  Users will be charged this amount per address to use premium features
     *
     * @dev    Price of subscription is set in ETH, stored in 1e18 (wei)
     * @dev    Passing in a value of 0 will set premium features to free.
     * @dev    - Throws if caller is not owner
     *
     * @dev    On completion:
     * @dev    - `subscriptionPrice` = `newSubscriptionPrice`
     * @dev    - Emits {SubscriptionPriceUpdated} event
     *
     * @param  newSubscriptionPrice Price to update future subscriptions to
     */
    function setSubscriptionPrice(uint256 newSubscriptionPrice) external {
        _requireIsOwner();

        uint256 oldSubscriptionPrice = subscriptionPrice;
        subscriptionPrice = newSubscriptionPrice;
        emit SubscriptionPriceUpdated(newSubscriptionPrice, oldSubscriptionPrice);
    }

    /**
     * @notice Sets the percentage of fees used to buy and burn CHART
     *
     * @dev    - Throws if `msg.sender` != `owner()`
     * @dev    - Throws if provided percent is > 100
     *
     * @dev    On completion:
     * @dev    - `burnPercent` = `newPercent`
     * @dev    - Emits {BurnPercentUpdated} event
     *
     * @param newPercent Percentage of fees to be used to buy and burn CHART
     */
    function setBurnPercent(uint8 newPercent) external {
        _requireIsOwner();

        if (newPercent > 100) {
            revert SubscriptionManager__BurnPercentMustBeLessThan100();
        }

        if (newPercent < 50) {
            revert SubscriptionManager__BurnPercentMustBeGreaterThan50();
        }

        uint8 oldPercent = burnPercent;
        burnPercent = newPercent;
        emit BurnPercentUpdated(newPercent, oldPercent);
    }

    /**
     * @notice Updates the staking configuration
     *
     * @dev    - Throws if `msg.sender` != `owner()`
     * 
     * @dev    On completion:
     * @dev    - `stakingConfig` = `newStakingConfig`
     * 
     * @param stakeSubscriptionLength_ Length of subscription granted for staking CHART
     * @param minStakingLength_ Minimum length of time to stake CHART
     * @param maxStakingLength_ Maximum length of time to stake CHART
     * @param minStakingAmount_ Minimum amount of CHART required to stake
     * @param step_ Step amount to reduce CHART required to stake based on stake length
     */
    function updateStakingConfig(uint40 stakeSubscriptionLength_, uint40 minStakingLength_, uint40 maxStakingLength_, uint256 minStakingAmount_, uint256 step_) external {
        _requireIsOwner();

        stakingConfig = StakingConfig({
            stakeSubscriptionLength: stakeSubscriptionLength_,
            minStakingLength: minStakingLength_,
            maxStakingLength: maxStakingLength_,
            minStakingAmount: minStakingAmount_,
            step: step_
        });
    }

    /**
     * @notice Allows owner to increase the expiration timestamp for a provided user in case of 
     * @notice giveaways. Also allows for owner to revoke subscriptions in case of abuse.
     *
     * @dev    - Throws if `msg.sender` != `owner()
     * @dev    - Throws if `user` == address(0)
     *
     * @dev    On completion:
     * @dev    - User expiration is set to `newExpiration`
     */
    function setExpirationTimestamp(uint40 newExpiration, address user) external {
        _requireIsOwner();
        if (user == address(0)) {
            revert SubscriptionManager__CannotRegisterAddressZero();
        }
        LibMap.set(expiration, uint256(uint160(user)), newExpiration);
    }

    /**
     * @notice Allows owner to increase the expiration timestamp for a provided user in case of 
     * @notice giveaways. Also allows for owner to revoke subscriptions in case of abuse.
     *
     * @dev    - Throws if `msg.sender` != `owner()
     * @dev    - Throws if `user` == address(0)
     * @dev    - Throws if newExpiration.length != user.length
     *
     * @dev    On completion:
     * @dev    - User expiration is set to `newExpiration` for each user in `user`
     */
    function bulkSetExpirationTimestamp(uint40[] calldata newExpiration, address[] calldata user) external {
        _requireIsOwner();
        if (newExpiration.length != user.length) {
            revert SubscriptionManager__MustProvideEqualLengthArrays();
        }
        for (uint256 i = 0; i < newExpiration.length;) {
            _requireValidAddress(user[i]);
            LibMap.set(expiration, uint256(uint160(user[i])), newExpiration[i]);
            unchecked {
                ++i;
            }
        }
    }

    /**
     * @notice Grants the KEEPER_ROLE to the provided user.
     *
     * @dev    - Throws if the `msg.sender` is not `owner()`
     *
     * @dev    On completion:
     * @dev    - `newKeeper` is assigned the `KEEPER_ROLE`
     *
     * @param newKeeper Address to assign the `KEEPER_ROLE`
     */
    function grantKeeperRole(address newKeeper) external {
        grantRoles(newKeeper, KEEPER_ROLE);
    }

    /**
     * @notice Revokes the KEEPER_ROLE from the provided user.
     *
     * @dev    - Throws if the `msg.sender` is not `owner()`
     *
     * @dev    On completion:
     * @dev    - `toRevoke` is no longer assigned the `KEEPER_ROLE`
     *
     * @param toRevoke Address to revoke the `KEEPER_ROLE` from
     */
    function revokeKeeperRole(address toRevoke) external {
        revokeRoles(toRevoke, KEEPER_ROLE);
    }

    /**
     * @notice Registers a list of addresses for premium features.  There is an optional referrer address
     * @notice which will receive a percentage of the fees paid by the registered addresses if they have an active subscription.
     *
     * @dev    - Throws if the length of the provided addresses is 0
     * @dev    - Throws if `msg.value` is not equal to the exact amount required to pay for the subscriptions
     * @dev    - Throws if any address provided is address(0)
     * @dev    - Throws if the referrer address executes code > 2300 gas
     * @dev    - If the provided referral address is not subscribed, it is a no-op
     *
     * @dev    On completion:
     * @dev    - `expiration` mapping for each address is updated to add on an additional `subLength` seconds
     * @dev    - If `expiration` + the current length of subscriptions is > uint256 max, set to uint256 max
     * @dev    - If the current length of subscription is 0, set `expiration` to uint256 max
     * @dev    - The contract has `subLength` * `subPrice` - `referralAmount` more ETH
     * @dev    - If the referrer is subscribed, they receive `referralAmount` ETH
     * @dev    - Emits `addresses.length` {SubscriptionPaid} events
     * @dev    - Emits {ReferralPaid} event if referrer is subscribed
     *
     * @param  addresses A list of addresses to register
     * @param  referrer  Optional address of referrer
     */
    function registerAddresses(address[] calldata addresses, address referrer) external payable {
        uint256 numSubs = addresses.length;
        if (numSubs == 0) {
            revert SubscriptionManager__MustProvideAtLeastOneAddress();
        }
        if (referrer == msg.sender) {
            revert SubscriptionManager__CannotReferSelf();
        }

        uint256 subPrice = subscriptionPrice;
        uint256 ethRequired = numSubs * subPrice;
        uint256 referralAmount;

        if (msg.value != ethRequired) {
            revert SubscriptionManager__InvalidETHAmountProvided(msg.value, ethRequired);
        }

        if (referrer != address(0)) {
            if (block.timestamp <= LibMap.get(expiration, uint256(uint160(referrer)))) {
                if (referralPercent > 0) {
                    referralAmount = ethRequired * referralPercent / 100;
                }
            }
        }

        uint40 subLength = subscriptionLength;

        if (subLength == 0) {
            for (uint256 i = 0; i < numSubs;) {
                address addr = addresses[i];
                _requireValidAddress(addr);
                LibMap.set(expiration, uint256(uint160(addr)), type(uint40).max);

                emit SubscriptionPaid(addr, MAX_UINT40, subPrice);

                unchecked {
                    ++i;
                }
            }
        } else {
            uint40 maxExpiration = type(uint40).max - subLength;
            for (uint256 i = 0; i < numSubs;) {
                address addr = addresses[i];
                _requireValidAddress(addr);
                uint40 addrExpiration = _increaseExpiration(addr, subLength, maxExpiration);

                emit SubscriptionPaid(addr, addrExpiration, subPrice);

                unchecked {
                    ++i;
                }
            }
        }

        if (referralAmount > 0) {
            // We use `transfer` here to limit the amount of gas forwarded to the referrer
            // As such, referrer addresses should be EOAs or contracts without fallback / receive functionality
            payable(referrer).transfer(referralAmount);
            emit ReferralPaid(referrer, referralAmount);
        }
    }

    /**
     * @notice Allows a user to stake CHART for a period of time.  Successfully meeting the threshold
     * @notice will grant the user a subscription for a set amount of time.
     *
     * @dev    - Throws if the provided CHART amount is too low for the provided stake length
     * @dev    - Throws if the provided stake length is > `MAX_STAKE_LENGTH`
     * @dev    - Throws if the provided stake length is < `MIN_STAKE_LENGTH`
     * @dev    - Throws if the address already has an active subscription
     * @dev    - Throws if the required CHART amount is not approved for transfer
     *
     * @dev    On completion:
     * @dev    - `msg.sender` has `chartRequired` CHART transferred from their account to this contract
     * @dev    - `msg.sender` has `amount` CHART staked for `stakeLength` seconds
     * @dev    - `subscriberAddress` expiration timestamp is set to `block.timestamp` + `STAKE_SUBSCRIPTION_LENGTH`
     * @dev    - `subscriberAddress` staking expiration timestamp is set to `block.timestamp` + `stakeLength`
     */
    function stake(uint40 stakeLength, address[] calldata addresses) external {
        uint256 numSubs = addresses.length;
        if (numSubs == 0) {
            revert SubscriptionManager__MustProvideAtLeastOneAddress();
        }

        StakingConfig memory config = stakingConfig;
        if (stakeLength > config.maxStakingLength) {
            revert SubscriptionManager__StakeLengthGreaterThanMaximumLength();
        }
        if (stakeLength < config.minStakingLength) {
            revert SubscriptionManager__StakeLengthLessThanMinimumLength();
        }

        uint256 chartPerAccount = config.minStakingAmount - (((stakeLength - config.minStakingLength) / config.minStakingLength) * config.step / 100);
        uint256 chartRequired = chartPerAccount * numSubs;
        uint40 subscriptionExpirationTimestamp = uint40(block.timestamp + config.stakeSubscriptionLength);
        uint40 stakingExpirationTimestamp = uint40(block.timestamp + stakeLength);

        chart.transferFrom(msg.sender, address(this), chartRequired);
        
        for(uint256 i = 0; i < numSubs;) {
            address subscriberAddress = addresses[i];
            _requireValidAddress(subscriberAddress);
            if (block.timestamp <= LibMap.get(expiration, uint256(uint160(subscriberAddress)))) {
                revert SubscriptionManager__CannotStakeForAccountsWithCurrentSubscription();
            }

            LibMap.set(expiration, uint256(uint160(subscriberAddress)), subscriptionExpirationTimestamp);
            staking[subscriberAddress] = StakingInfo(msg.sender, stakeLength, stakingExpirationTimestamp, chartPerAccount);

            emit Staked(subscriberAddress, stakeLength, chartPerAccount, stakingExpirationTimestamp);

            unchecked {
                ++i;
            }
        }
    }

    /**
     * @notice Allows a user to unstake CHART after the expiration timestamp has passed.
     * 
     * @dev    - Throws if any of the provided addresses do not have an active stake
     * @dev    - Throws if any of the provided addresses have not passed their staking expiration timestamp
     * @dev    - Throws if `msg.sender` is not the staker for any of the addresses provided
     *
     * @dev    On completion:
     * @dev    - `msg.sender` has the sum of all `stakedAmount` assigned to the addresses CHART transferred from this contract to their account
     * @dev    - the addresses provided have their staking information removed
     *
     * @param  addresses A list of addresses to unstake for
     */
     function unstake(address[] calldata addresses) external {
        uint256 numSubs = addresses.length;
        if (numSubs == 0) {
            revert SubscriptionManager__MustProvideAtLeastOneAddress();
        }

        uint256 amountToRefund = 0;

        for(uint256 i = 0; i < numSubs;) {
            address subscriberAddress = addresses[i];
            _requireValidAddress(subscriberAddress);

            StakingInfo memory info = staking[subscriberAddress];
            if (info.stakedAmount == 0) {
                revert SubscriptionManager__CannotUnstakeForAccountsWithoutStake();
            }
            if (block.timestamp <= info.stakingExpirationTimestamp) {
                revert SubscriptionManager__CannotUnstakeForAccountsWithActiveStake();
            }
            if (msg.sender != info.staker) {
                revert SubscriptionManager__MustBeStakerToUnstake();
            }

            amountToRefund += info.stakedAmount;

            delete staking[subscriberAddress];
            emit Unstaked(subscriberAddress, info.stakedAmount);

            unchecked {
                ++i;
            }
        }
        chart.transfer(msg.sender, amountToRefund);
     }

    /**
     * @notice Allows a user to restake CHART if they have less than 1 month remaining on their stake expiration
     * @notice This function will extend your stake by the original stake length.  If you would like to 
     * @notice extend your stake by a different amount, unstake and then use the `stake` function.
     *
     * @dev    - Throws if any of the provided addresses do not have an active stake
     * @dev    - Throws if any of the provided addresses have more than 1 month remaining on their stake expiration
     * @dev    - Throws if `msg.sender` is not the staker
     * 
     * @dev    On completion:
     * @dev    - `msg.sender` has the sum of all `stakedAmount` assigned to the addresses CHART transferred from their account to this contract
     * @dev    - The addresses provided have their subscription extended by 6 months
     * @dev    - The addresses provided have their stake expiration timestamp extended by the required amount
     *
     * @param  addresses A list of addresses to restake for
     */
    function restake(address[] calldata addresses) external {
        uint256 numSubs = addresses.length;
        if (numSubs == 0) {
            revert SubscriptionManager__MustProvideAtLeastOneAddress();
        }

        for(uint256 i = 0; i < numSubs;) {
            address subscriberAddress = addresses[i];
            _requireValidAddress(subscriberAddress);

            StakingInfo memory info = staking[subscriberAddress];
            if (info.stakedAmount == 0) {
                revert SubscriptionManager__CannotRestakeForAccountsWithoutStake();
            }
            if (block.timestamp < info.stakingExpirationTimestamp - 30 days) {
                revert SubscriptionManager__CannotRestakeForAccountsWithMoreThanOneMonthRemaining();
            }
            if (info.staker != msg.sender) {
                revert SubscriptionManager__MustBeStakerToRestake();
            }

            staking[subscriberAddress].stakingExpirationTimestamp += info.stakeLength;
            StakingConfig memory config = stakingConfig;
            _increaseExpiration(subscriberAddress, config.stakeSubscriptionLength, type(uint40).max - config.stakeSubscriptionLength);
            emit Restaked(subscriberAddress, info.stakedAmount);

            unchecked {
                ++i;
            }
        }
    }

    /**
     * @notice Uses fees from subscriptions to buyback and burn CHART from the uniswap v2 pair
     *
     * @dev    This is a high risk function, anyone with KEEPER_ROLE could potentially sandwich this call
     * @dev    Do not give KEEPER_ROLE to addresses unless you fully trust them
     * @dev    If you would like to ignore slippage, pass in 0 for amountOutMin
     * @dev    - Throws if `msg.sender` does not have owner or `KEEPER_ROLE`
     * @dev    - Throws if there is an error sending funds to `msg.sender`
     *
     * @dev    On completion:
     * @dev    - `burnPercent`% of the balance of the contract is used to buy and burn CHART
     * @dev    - The remaining balance is sent to the `msg.sender` to cover operational expenses
     * @dev    - address(this).balance == 0
     *
     * @param  amountOutMin Minimum amount of CHART to receive from `burnPercent`% * balance ETH
     */
    function burnETH(uint256 amountOutMin) external {
        _checkRolesOrOwner(KEEPER_ROLE);
        uint256 balance = address(this).balance;

        uint256 amountToBurn = balance * burnPercent / 100;
        uint256 amountToSend = balance - amountToBurn;

        address[] memory path = new address[](2);
        path[0] = router.WETH();
        path[1] = address(chart);

        router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amountToBurn}(
            amountOutMin,
            path,
            address(0xdead),
            block.timestamp
        );

        // Gated role, do not need to worry about gas to forward
        (bool success,) = payable(msg.sender).call{value: amountToSend}("");
        if (!success) {
            revert SubscriptionManager__ErrorSendingKeeperFunds();
        }
    }

    /**
     * @notice Returns if an address has a current subscription
     *
     * @param  user Address of user
     * @return True if user has an active subscription, false if not
     */
    function isAddressRegistered(address user) external view returns (bool) {
        return block.timestamp <= LibMap.get(expiration, uint256(uint160(user)));
    }

    /**
     * @notice Returns the expiration timestamp for a given address
     *
     * @param  user Address of user
     * @return Expiration timestamp for the provided address
     */
    function getExpiration(address user) external view returns (uint40) {
        return LibMap.get(expiration, uint256(uint160(user)));
    }

    /**
     * @notice Returns the staking expiration timestamp for a given address
     *
     * @param  user Address of user
     * @return Staking expiration timestamp for the provided address
     */
    function getStakingExpiration(address user) external view returns (uint40) {
        return staking[user].stakingExpirationTimestamp;
    }

    /**
     * @notice Returns the amount of CHART required to stake for the provided amount of time
     *
     * @dev    - Throws if `stakeLength` > maxStakingLength
     * @dev    - Throws if `stakeLength` < minStakingLength
     *
     * @param  stakeLength Length of time to stake CHART
     * @return Amount of CHART required to stake
     */
    function chartRequiredForStake(uint40 stakeLength) external view returns (uint256) {
        StakingConfig memory config = stakingConfig;
        if (stakeLength > config.maxStakingLength) {
            revert SubscriptionManager__StakeLengthGreaterThanMaximumLength();
        }
        if (stakeLength < config.minStakingLength) {
            revert SubscriptionManager__StakeLengthLessThanMinimumLength();
        }
        return config.minStakingAmount - ((((stakeLength - config.minStakingLength) / config.minStakingLength) * config.step / 100) * 1e18);
    }

    /**
     * @notice Returns if the provided address is eligible to restake
     *
     * @param  addr Address to check
     * @return True if the address is eligible to restake, false if not
     */
    function canRestake(address addr) external view returns (bool) {
        StakingInfo memory info = staking[addr];
        return info.stakedAmount > 0 && block.timestamp < info.stakingExpirationTimestamp - 30 days;
    }

    function _increaseExpiration(address addr, uint40 subLength, uint40 maxExpiration) internal returns (uint40) {
        uint256 uintAddr = uint256(uint160(addr));
        uint40 addrExpiration = LibMap.get(expiration, uintAddr);
        uint40 timestamp = uint40(block.timestamp);
        if (addrExpiration <= timestamp) {
            if (timestamp > maxExpiration) {
                addrExpiration = type(uint40).max;
            } else {
                addrExpiration = timestamp + subLength;
            }
        } else if (addrExpiration < maxExpiration) {
            // Unchecked is safe here as we know that expiration + subLength < MAX_UINT40
            unchecked {
                addrExpiration += subLength;
            }
        } else {
            addrExpiration = type(uint40).max;
        }
        LibMap.set(expiration, uintAddr, addrExpiration);

        return addrExpiration;
    }

    /// @dev Convenience function to require user is owner
    function _requireIsOwner() internal view {
        if (msg.sender != owner()) {
            revert SubscriptionManager__OnlyOwner();
        }
    }

    /// @dev Convenience function to validate address input
    function _requireValidAddress(address addr) internal pure {
        if (addr == address(0)) {
            revert SubscriptionManager__CannotRegisterAddressZero();
        }
    }
}

// File: lib/solady/src/auth/OwnableRoles.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

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

/// @notice Simple single owner and multiroles authorization mixin.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol)
/// @dev While the ownable portion follows [EIP-173](https://eips.ethereum.org/EIPS/eip-173)
/// for compatibility, the nomenclature for the 2-step ownership handover and roles
/// may be unique to this codebase.
abstract contract OwnableRoles is Ownable {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The `user`'s roles is updated to `roles`.
    /// Each bit of `roles` represents whether the role is set.
    event RolesUpdated(address indexed user, uint256 indexed roles);

    /// @dev `keccak256(bytes("RolesUpdated(address,uint256)"))`.
    uint256 private constant _ROLES_UPDATED_EVENT_SIGNATURE =
        0x715ad5ce61fc9595c7b415289d59cf203f23a94fa06f04af7e489a0a76e1fe26;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STORAGE                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The role slot of `user` is given by:
    /// ```
    ///     mstore(0x00, or(shl(96, user), _ROLE_SLOT_SEED))
    ///     let roleSlot := keccak256(0x00, 0x20)
    /// ```
    /// This automatically ignores the upper bits of the `user` in case
    /// they are not clean, as well as keep the `keccak256` under 32-bytes.
    ///
    /// Note: This is equal to `_OWNER_SLOT_NOT` in for gas efficiency.
    uint256 private constant _ROLE_SLOT_SEED = 0x8b78c6d8;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     INTERNAL FUNCTIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Overwrite the roles directly without authorization guard.
    function _setRoles(address user, uint256 roles) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x0c, _ROLE_SLOT_SEED)
            mstore(0x00, user)
            // Store the new value.
            sstore(keccak256(0x0c, 0x20), roles)
            // Emit the {RolesUpdated} event.
            log3(0, 0, _ROLES_UPDATED_EVENT_SIGNATURE, shr(96, mload(0x0c)), roles)
        }
    }

    /// @dev Updates the roles directly without authorization guard.
    /// If `on` is true, each set bit of `roles` will be turned on,
    /// otherwise, each set bit of `roles` will be turned off.
    function _updateRoles(address user, uint256 roles, bool on) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x0c, _ROLE_SLOT_SEED)
            mstore(0x00, user)
            let roleSlot := keccak256(0x0c, 0x20)
            // Load the current value.
            let current := sload(roleSlot)
            // Compute the updated roles if `on` is true.
            let updated := or(current, roles)
            // Compute the updated roles if `on` is false.
            // Use `and` to compute the intersection of `current` and `roles`,
            // `xor` it with `current` to flip the bits in the intersection.
            if iszero(on) { updated := xor(current, and(current, roles)) }
            // Then, store the new value.
            sstore(roleSlot, updated)
            // Emit the {RolesUpdated} event.
            log3(0, 0, _ROLES_UPDATED_EVENT_SIGNATURE, shr(96, mload(0x0c)), updated)
        }
    }

    /// @dev Grants the roles directly without authorization guard.
    /// Each bit of `roles` represents the role to turn on.
    function _grantRoles(address user, uint256 roles) internal virtual {
        _updateRoles(user, roles, true);
    }

    /// @dev Removes the roles directly without authorization guard.
    /// Each bit of `roles` represents the role to turn off.
    function _removeRoles(address user, uint256 roles) internal virtual {
        _updateRoles(user, roles, false);
    }

    /// @dev Throws if the sender does not have any of the `roles`.
    function _checkRoles(uint256 roles) internal view virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the role slot.
            mstore(0x0c, _ROLE_SLOT_SEED)
            mstore(0x00, caller())
            // Load the stored value, and if the `and` intersection
            // of the value and `roles` is zero, revert.
            if iszero(and(sload(keccak256(0x0c, 0x20)), roles)) {
                mstore(0x00, 0x82b42900) // `Unauthorized()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Throws if the sender is not the owner,
    /// and does not have any of the `roles`.
    /// Checks for ownership first, then lazily checks for roles.
    function _checkOwnerOrRoles(uint256 roles) internal view virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // If the caller is not the stored owner.
            // Note: `_ROLE_SLOT_SEED` is equal to `_OWNER_SLOT_NOT`.
            if iszero(eq(caller(), sload(not(_ROLE_SLOT_SEED)))) {
                // Compute the role slot.
                mstore(0x0c, _ROLE_SLOT_SEED)
                mstore(0x00, caller())
                // Load the stored value, and if the `and` intersection
                // of the value and `roles` is zero, revert.
                if iszero(and(sload(keccak256(0x0c, 0x20)), roles)) {
                    mstore(0x00, 0x82b42900) // `Unauthorized()`.
                    revert(0x1c, 0x04)
                }
            }
        }
    }

    /// @dev Throws if the sender does not have any of the `roles`,
    /// and is not the owner.
    /// Checks for roles first, then lazily checks for ownership.
    function _checkRolesOrOwner(uint256 roles) internal view virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the role slot.
            mstore(0x0c, _ROLE_SLOT_SEED)
            mstore(0x00, caller())
            // Load the stored value, and if the `and` intersection
            // of the value and `roles` is zero, revert.
            if iszero(and(sload(keccak256(0x0c, 0x20)), roles)) {
                // If the caller is not the stored owner.
                // Note: `_ROLE_SLOT_SEED` is equal to `_OWNER_SLOT_NOT`.
                if iszero(eq(caller(), sload(not(_ROLE_SLOT_SEED)))) {
                    mstore(0x00, 0x82b42900) // `Unauthorized()`.
                    revert(0x1c, 0x04)
                }
            }
        }
    }

    /// @dev Convenience function to return a `roles` bitmap from an array of `ordinals`.
    /// This is meant for frontends like Etherscan, and is therefore not fully optimized.
    /// Not recommended to be called on-chain.
    /// Made internal to conserve bytecode. Wrap it in a public function if needed.
    function _rolesFromOrdinals(uint8[] memory ordinals) internal pure returns (uint256 roles) {
        /// @solidity memory-safe-assembly
        assembly {
            for { let i := shl(5, mload(ordinals)) } i { i := sub(i, 0x20) } {
                // We don't need to mask the values of `ordinals`, as Solidity
                // cleans dirty upper bits when storing variables into memory.
                roles := or(shl(mload(add(ordinals, i)), 1), roles)
            }
        }
    }

    /// @dev Convenience function to return an array of `ordinals` from the `roles` bitmap.
    /// This is meant for frontends like Etherscan, and is therefore not fully optimized.
    /// Not recommended to be called on-chain.
    /// Made internal to conserve bytecode. Wrap it in a public function if needed.
    function _ordinalsFromRoles(uint256 roles) internal pure returns (uint8[] memory ordinals) {
        /// @solidity memory-safe-assembly
        assembly {
            // Grab the pointer to the free memory.
            ordinals := mload(0x40)
            let ptr := add(ordinals, 0x20)
            let o := 0
            // The absence of lookup tables, De Bruijn, etc., here is intentional for
            // smaller bytecode, as this function is not meant to be called on-chain.
            for { let t := roles } 1 {} {
                mstore(ptr, o)
                // `shr` 5 is equivalent to multiplying by 0x20.
                // Push back into the ordinals array if the bit is set.
                ptr := add(ptr, shl(5, and(t, 1)))
                o := add(o, 1)
                t := shr(o, roles)
                if iszero(t) { break }
            }
            // Store the length of `ordinals`.
            mstore(ordinals, shr(5, sub(ptr, add(ordinals, 0x20))))
            // Allocate the memory.
            mstore(0x40, ptr)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  PUBLIC UPDATE FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Allows the owner to grant `user` `roles`.
    /// If the `user` already has a role, then it will be an no-op for the role.
    function grantRoles(address user, uint256 roles) public payable virtual onlyOwner {
        _grantRoles(user, roles);
    }

    /// @dev Allows the owner to remove `user` `roles`.
    /// If the `user` does not have a role, then it will be an no-op for the role.
    function revokeRoles(address user, uint256 roles) public payable virtual onlyOwner {
        _removeRoles(user, roles);
    }

    /// @dev Allow the caller to remove their own roles.
    /// If the caller does not have a role, then it will be an no-op for the role.
    function renounceRoles(uint256 roles) public payable virtual {
        _removeRoles(msg.sender, roles);
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   PUBLIC READ FUNCTIONS                    */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the roles of `user`.
    function rolesOf(address user) public view virtual returns (uint256 roles) {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the role slot.
            mstore(0x0c, _ROLE_SLOT_SEED)
            mstore(0x00, user)
            // Load the stored value.
            roles := sload(keccak256(0x0c, 0x20))
        }
    }

    /// @dev Returns whether `user` has any of `roles`.
    function hasAnyRole(address user, uint256 roles) public view virtual returns (bool) {
        return rolesOf(user) & roles != 0;
    }

    /// @dev Returns whether `user` has all of `roles`.
    function hasAllRoles(address user, uint256 roles) public view virtual returns (bool) {
        return rolesOf(user) & roles == roles;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         MODIFIERS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Marks a function as only callable by an account with `roles`.
    modifier onlyRoles(uint256 roles) virtual {
        _checkRoles(roles);
        _;
    }

    /// @dev Marks a function as only callable by the owner or by an account
    /// with `roles`. Checks for ownership first, then lazily checks for roles.
    modifier onlyOwnerOrRoles(uint256 roles) virtual {
        _checkOwnerOrRoles(roles);
        _;
    }

    /// @dev Marks a function as only callable by an account with `roles`
    /// or the owner. Checks for roles first, then lazily checks for ownership.
    modifier onlyRolesOrOwner(uint256 roles) virtual {
        _checkRolesOrOwner(roles);
        _;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       ROLE CONSTANTS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // IYKYK

    uint256 internal constant _ROLE_0 = 1 << 0;
    uint256 internal constant _ROLE_1 = 1 << 1;
    uint256 internal constant _ROLE_2 = 1 << 2;
    uint256 internal constant _ROLE_3 = 1 << 3;
    uint256 internal constant _ROLE_4 = 1 << 4;
    uint256 internal constant _ROLE_5 = 1 << 5;
    uint256 internal constant _ROLE_6 = 1 << 6;
    uint256 internal constant _ROLE_7 = 1 << 7;
    uint256 internal constant _ROLE_8 = 1 << 8;
    uint256 internal constant _ROLE_9 = 1 << 9;
    uint256 internal constant _ROLE_10 = 1 << 10;
    uint256 internal constant _ROLE_11 = 1 << 11;
    uint256 internal constant _ROLE_12 = 1 << 12;
    uint256 internal constant _ROLE_13 = 1 << 13;
    uint256 internal constant _ROLE_14 = 1 << 14;
    uint256 internal constant _ROLE_15 = 1 << 15;
    uint256 internal constant _ROLE_16 = 1 << 16;
    uint256 internal constant _ROLE_17 = 1 << 17;
    uint256 internal constant _ROLE_18 = 1 << 18;
    uint256 internal constant _ROLE_19 = 1 << 19;
    uint256 internal constant _ROLE_20 = 1 << 20;
    uint256 internal constant _ROLE_21 = 1 << 21;
    uint256 internal constant _ROLE_22 = 1 << 22;
    uint256 internal constant _ROLE_23 = 1 << 23;
    uint256 internal constant _ROLE_24 = 1 << 24;
    uint256 internal constant _ROLE_25 = 1 << 25;
    uint256 internal constant _ROLE_26 = 1 << 26;
    uint256 internal constant _ROLE_27 = 1 << 27;
    uint256 internal constant _ROLE_28 = 1 << 28;
    uint256 internal constant _ROLE_29 = 1 << 29;
    uint256 internal constant _ROLE_30 = 1 << 30;
    uint256 internal constant _ROLE_31 = 1 << 31;
    uint256 internal constant _ROLE_32 = 1 << 32;
    uint256 internal constant _ROLE_33 = 1 << 33;
    uint256 internal constant _ROLE_34 = 1 << 34;
    uint256 internal constant _ROLE_35 = 1 << 35;
    uint256 internal constant _ROLE_36 = 1 << 36;
    uint256 internal constant _ROLE_37 = 1 << 37;
    uint256 internal constant _ROLE_38 = 1 << 38;
    uint256 internal constant _ROLE_39 = 1 << 39;
    uint256 internal constant _ROLE_40 = 1 << 40;
    uint256 internal constant _ROLE_41 = 1 << 41;
    uint256 internal constant _ROLE_42 = 1 << 42;
    uint256 internal constant _ROLE_43 = 1 << 43;
    uint256 internal constant _ROLE_44 = 1 << 44;
    uint256 internal constant _ROLE_45 = 1 << 45;
    uint256 internal constant _ROLE_46 = 1 << 46;
    uint256 internal constant _ROLE_47 = 1 << 47;
    uint256 internal constant _ROLE_48 = 1 << 48;
    uint256 internal constant _ROLE_49 = 1 << 49;
    uint256 internal constant _ROLE_50 = 1 << 50;
    uint256 internal constant _ROLE_51 = 1 << 51;
    uint256 internal constant _ROLE_52 = 1 << 52;
    uint256 internal constant _ROLE_53 = 1 << 53;
    uint256 internal constant _ROLE_54 = 1 << 54;
    uint256 internal constant _ROLE_55 = 1 << 55;
    uint256 internal constant _ROLE_56 = 1 << 56;
    uint256 internal constant _ROLE_57 = 1 << 57;
    uint256 internal constant _ROLE_58 = 1 << 58;
    uint256 internal constant _ROLE_59 = 1 << 59;
    uint256 internal constant _ROLE_60 = 1 << 60;
    uint256 internal constant _ROLE_61 = 1 << 61;
    uint256 internal constant _ROLE_62 = 1 << 62;
    uint256 internal constant _ROLE_63 = 1 << 63;
    uint256 internal constant _ROLE_64 = 1 << 64;
    uint256 internal constant _ROLE_65 = 1 << 65;
    uint256 internal constant _ROLE_66 = 1 << 66;
    uint256 internal constant _ROLE_67 = 1 << 67;
    uint256 internal constant _ROLE_68 = 1 << 68;
    uint256 internal constant _ROLE_69 = 1 << 69;
    uint256 internal constant _ROLE_70 = 1 << 70;
    uint256 internal constant _ROLE_71 = 1 << 71;
    uint256 internal constant _ROLE_72 = 1 << 72;
    uint256 internal constant _ROLE_73 = 1 << 73;
    uint256 internal constant _ROLE_74 = 1 << 74;
    uint256 internal constant _ROLE_75 = 1 << 75;
    uint256 internal constant _ROLE_76 = 1 << 76;
    uint256 internal constant _ROLE_77 = 1 << 77;
    uint256 internal constant _ROLE_78 = 1 << 78;
    uint256 internal constant _ROLE_79 = 1 << 79;
    uint256 internal constant _ROLE_80 = 1 << 80;
    uint256 internal constant _ROLE_81 = 1 << 81;
    uint256 internal constant _ROLE_82 = 1 << 82;
    uint256 internal constant _ROLE_83 = 1 << 83;
    uint256 internal constant _ROLE_84 = 1 << 84;
    uint256 internal constant _ROLE_85 = 1 << 85;
    uint256 internal constant _ROLE_86 = 1 << 86;
    uint256 internal constant _ROLE_87 = 1 << 87;
    uint256 internal constant _ROLE_88 = 1 << 88;
    uint256 internal constant _ROLE_89 = 1 << 89;
    uint256 internal constant _ROLE_90 = 1 << 90;
    uint256 internal constant _ROLE_91 = 1 << 91;
    uint256 internal constant _ROLE_92 = 1 << 92;
    uint256 internal constant _ROLE_93 = 1 << 93;
    uint256 internal constant _ROLE_94 = 1 << 94;
    uint256 internal constant _ROLE_95 = 1 << 95;
    uint256 internal constant _ROLE_96 = 1 << 96;
    uint256 internal constant _ROLE_97 = 1 << 97;
    uint256 internal constant _ROLE_98 = 1 << 98;
    uint256 internal constant _ROLE_99 = 1 << 99;
    uint256 internal constant _ROLE_100 = 1 << 100;
    uint256 internal constant _ROLE_101 = 1 << 101;
    uint256 internal constant _ROLE_102 = 1 << 102;
    uint256 internal constant _ROLE_103 = 1 << 103;
    uint256 internal constant _ROLE_104 = 1 << 104;
    uint256 internal constant _ROLE_105 = 1 << 105;
    uint256 internal constant _ROLE_106 = 1 << 106;
    uint256 internal constant _ROLE_107 = 1 << 107;
    uint256 internal constant _ROLE_108 = 1 << 108;
    uint256 internal constant _ROLE_109 = 1 << 109;
    uint256 internal constant _ROLE_110 = 1 << 110;
    uint256 internal constant _ROLE_111 = 1 << 111;
    uint256 internal constant _ROLE_112 = 1 << 112;
    uint256 internal constant _ROLE_113 = 1 << 113;
    uint256 internal constant _ROLE_114 = 1 << 114;
    uint256 internal constant _ROLE_115 = 1 << 115;
    uint256 internal constant _ROLE_116 = 1 << 116;
    uint256 internal constant _ROLE_117 = 1 << 117;
    uint256 internal constant _ROLE_118 = 1 << 118;
    uint256 internal constant _ROLE_119 = 1 << 119;
    uint256 internal constant _ROLE_120 = 1 << 120;
    uint256 internal constant _ROLE_121 = 1 << 121;
    uint256 internal constant _ROLE_122 = 1 << 122;
    uint256 internal constant _ROLE_123 = 1 << 123;
    uint256 internal constant _ROLE_124 = 1 << 124;
    uint256 internal constant _ROLE_125 = 1 << 125;
    uint256 internal constant _ROLE_126 = 1 << 126;
    uint256 internal constant _ROLE_127 = 1 << 127;
    uint256 internal constant _ROLE_128 = 1 << 128;
    uint256 internal constant _ROLE_129 = 1 << 129;
    uint256 internal constant _ROLE_130 = 1 << 130;
    uint256 internal constant _ROLE_131 = 1 << 131;
    uint256 internal constant _ROLE_132 = 1 << 132;
    uint256 internal constant _ROLE_133 = 1 << 133;
    uint256 internal constant _ROLE_134 = 1 << 134;
    uint256 internal constant _ROLE_135 = 1 << 135;
    uint256 internal constant _ROLE_136 = 1 << 136;
    uint256 internal constant _ROLE_137 = 1 << 137;
    uint256 internal constant _ROLE_138 = 1 << 138;
    uint256 internal constant _ROLE_139 = 1 << 139;
    uint256 internal constant _ROLE_140 = 1 << 140;
    uint256 internal constant _ROLE_141 = 1 << 141;
    uint256 internal constant _ROLE_142 = 1 << 142;
    uint256 internal constant _ROLE_143 = 1 << 143;
    uint256 internal constant _ROLE_144 = 1 << 144;
    uint256 internal constant _ROLE_145 = 1 << 145;
    uint256 internal constant _ROLE_146 = 1 << 146;
    uint256 internal constant _ROLE_147 = 1 << 147;
    uint256 internal constant _ROLE_148 = 1 << 148;
    uint256 internal constant _ROLE_149 = 1 << 149;
    uint256 internal constant _ROLE_150 = 1 << 150;
    uint256 internal constant _ROLE_151 = 1 << 151;
    uint256 internal constant _ROLE_152 = 1 << 152;
    uint256 internal constant _ROLE_153 = 1 << 153;
    uint256 internal constant _ROLE_154 = 1 << 154;
    uint256 internal constant _ROLE_155 = 1 << 155;
    uint256 internal constant _ROLE_156 = 1 << 156;
    uint256 internal constant _ROLE_157 = 1 << 157;
    uint256 internal constant _ROLE_158 = 1 << 158;
    uint256 internal constant _ROLE_159 = 1 << 159;
    uint256 internal constant _ROLE_160 = 1 << 160;
    uint256 internal constant _ROLE_161 = 1 << 161;
    uint256 internal constant _ROLE_162 = 1 << 162;
    uint256 internal constant _ROLE_163 = 1 << 163;
    uint256 internal constant _ROLE_164 = 1 << 164;
    uint256 internal constant _ROLE_165 = 1 << 165;
    uint256 internal constant _ROLE_166 = 1 << 166;
    uint256 internal constant _ROLE_167 = 1 << 167;
    uint256 internal constant _ROLE_168 = 1 << 168;
    uint256 internal constant _ROLE_169 = 1 << 169;
    uint256 internal constant _ROLE_170 = 1 << 170;
    uint256 internal constant _ROLE_171 = 1 << 171;
    uint256 internal constant _ROLE_172 = 1 << 172;
    uint256 internal constant _ROLE_173 = 1 << 173;
    uint256 internal constant _ROLE_174 = 1 << 174;
    uint256 internal constant _ROLE_175 = 1 << 175;
    uint256 internal constant _ROLE_176 = 1 << 176;
    uint256 internal constant _ROLE_177 = 1 << 177;
    uint256 internal constant _ROLE_178 = 1 << 178;
    uint256 internal constant _ROLE_179 = 1 << 179;
    uint256 internal constant _ROLE_180 = 1 << 180;
    uint256 internal constant _ROLE_181 = 1 << 181;
    uint256 internal constant _ROLE_182 = 1 << 182;
    uint256 internal constant _ROLE_183 = 1 << 183;
    uint256 internal constant _ROLE_184 = 1 << 184;
    uint256 internal constant _ROLE_185 = 1 << 185;
    uint256 internal constant _ROLE_186 = 1 << 186;
    uint256 internal constant _ROLE_187 = 1 << 187;
    uint256 internal constant _ROLE_188 = 1 << 188;
    uint256 internal constant _ROLE_189 = 1 << 189;
    uint256 internal constant _ROLE_190 = 1 << 190;
    uint256 internal constant _ROLE_191 = 1 << 191;
    uint256 internal constant _ROLE_192 = 1 << 192;
    uint256 internal constant _ROLE_193 = 1 << 193;
    uint256 internal constant _ROLE_194 = 1 << 194;
    uint256 internal constant _ROLE_195 = 1 << 195;
    uint256 internal constant _ROLE_196 = 1 << 196;
    uint256 internal constant _ROLE_197 = 1 << 197;
    uint256 internal constant _ROLE_198 = 1 << 198;
    uint256 internal constant _ROLE_199 = 1 << 199;
    uint256 internal constant _ROLE_200 = 1 << 200;
    uint256 internal constant _ROLE_201 = 1 << 201;
    uint256 internal constant _ROLE_202 = 1 << 202;
    uint256 internal constant _ROLE_203 = 1 << 203;
    uint256 internal constant _ROLE_204 = 1 << 204;
    uint256 internal constant _ROLE_205 = 1 << 205;
    uint256 internal constant _ROLE_206 = 1 << 206;
    uint256 internal constant _ROLE_207 = 1 << 207;
    uint256 internal constant _ROLE_208 = 1 << 208;
    uint256 internal constant _ROLE_209 = 1 << 209;
    uint256 internal constant _ROLE_210 = 1 << 210;
    uint256 internal constant _ROLE_211 = 1 << 211;
    uint256 internal constant _ROLE_212 = 1 << 212;
    uint256 internal constant _ROLE_213 = 1 << 213;
    uint256 internal constant _ROLE_214 = 1 << 214;
    uint256 internal constant _ROLE_215 = 1 << 215;
    uint256 internal constant _ROLE_216 = 1 << 216;
    uint256 internal constant _ROLE_217 = 1 << 217;
    uint256 internal constant _ROLE_218 = 1 << 218;
    uint256 internal constant _ROLE_219 = 1 << 219;
    uint256 internal constant _ROLE_220 = 1 << 220;
    uint256 internal constant _ROLE_221 = 1 << 221;
    uint256 internal constant _ROLE_222 = 1 << 222;
    uint256 internal constant _ROLE_223 = 1 << 223;
    uint256 internal constant _ROLE_224 = 1 << 224;
    uint256 internal constant _ROLE_225 = 1 << 225;
    uint256 internal constant _ROLE_226 = 1 << 226;
    uint256 internal constant _ROLE_227 = 1 << 227;
    uint256 internal constant _ROLE_228 = 1 << 228;
    uint256 internal constant _ROLE_229 = 1 << 229;
    uint256 internal constant _ROLE_230 = 1 << 230;
    uint256 internal constant _ROLE_231 = 1 << 231;
    uint256 internal constant _ROLE_232 = 1 << 232;
    uint256 internal constant _ROLE_233 = 1 << 233;
    uint256 internal constant _ROLE_234 = 1 << 234;
    uint256 internal constant _ROLE_235 = 1 << 235;
    uint256 internal constant _ROLE_236 = 1 << 236;
    uint256 internal constant _ROLE_237 = 1 << 237;
    uint256 internal constant _ROLE_238 = 1 << 238;
    uint256 internal constant _ROLE_239 = 1 << 239;
    uint256 internal constant _ROLE_240 = 1 << 240;
    uint256 internal constant _ROLE_241 = 1 << 241;
    uint256 internal constant _ROLE_242 = 1 << 242;
    uint256 internal constant _ROLE_243 = 1 << 243;
    uint256 internal constant _ROLE_244 = 1 << 244;
    uint256 internal constant _ROLE_245 = 1 << 245;
    uint256 internal constant _ROLE_246 = 1 << 246;
    uint256 internal constant _ROLE_247 = 1 << 247;
    uint256 internal constant _ROLE_248 = 1 << 248;
    uint256 internal constant _ROLE_249 = 1 << 249;
    uint256 internal constant _ROLE_250 = 1 << 250;
    uint256 internal constant _ROLE_251 = 1 << 251;
    uint256 internal constant _ROLE_252 = 1 << 252;
    uint256 internal constant _ROLE_253 = 1 << 253;
    uint256 internal constant _ROLE_254 = 1 << 254;
    uint256 internal constant _ROLE_255 = 1 << 255;
}

// File: lib/solady/src/utils/LibMap.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice Library for storage of packed unsigned integers.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/LibMap.sol)
library LibMap {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STRUCTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev A uint8 map in storage.
    struct Uint8Map {
        mapping(uint256 => uint256) map;
    }

    /// @dev A uint16 map in storage.
    struct Uint16Map {
        mapping(uint256 => uint256) map;
    }

    /// @dev A uint32 map in storage.
    struct Uint32Map {
        mapping(uint256 => uint256) map;
    }

    /// @dev A uint40 map in storage. Useful for storing timestamps up to 34841 A.D.
    struct Uint40Map {
        mapping(uint256 => uint256) map;
    }

    /// @dev A uint64 map in storage.
    struct Uint64Map {
        mapping(uint256 => uint256) map;
    }

    /// @dev A uint128 map in storage.
    struct Uint128Map {
        mapping(uint256 => uint256) map;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         OPERATIONS                         */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the uint8 value at `index` in `map`.
    function get(Uint8Map storage map, uint256 index) internal view returns (uint8 result) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, map.slot)
            mstore(0x00, shr(5, index))
            result := byte(and(31, not(index)), sload(keccak256(0x00, 0x40)))
        }
    }

    /// @dev Updates the uint8 value at `index` in `map`.
    function set(Uint8Map storage map, uint256 index, uint8 value) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, map.slot)
            mstore(0x00, shr(5, index))
            let s := keccak256(0x00, 0x40) // Storage slot.
            mstore(0x00, sload(s))
            mstore8(and(31, not(index)), value)
            sstore(s, mload(0x00))
        }
    }

    /// @dev Returns the uint16 value at `index` in `map`.
    function get(Uint16Map storage map, uint256 index) internal view returns (uint16 result) {
        result = uint16(map.map[index >> 4] >> ((index & 15) << 4));
    }

    /// @dev Updates the uint16 value at `index` in `map`.
    function set(Uint16Map storage map, uint256 index, uint16 value) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, map.slot)
            mstore(0x00, shr(4, index))
            let s := keccak256(0x00, 0x40) // Storage slot.
            let o := shl(4, and(index, 15)) // Storage slot offset (bits).
            let v := sload(s) // Storage slot value.
            let m := 0xffff // Value mask.
            sstore(s, xor(v, shl(o, and(m, xor(shr(o, v), value)))))
        }
    }

    /// @dev Returns the uint32 value at `index` in `map`.
    function get(Uint32Map storage map, uint256 index) internal view returns (uint32 result) {
        result = uint32(map.map[index >> 3] >> ((index & 7) << 5));
    }

    /// @dev Updates the uint32 value at `index` in `map`.
    function set(Uint32Map storage map, uint256 index, uint32 value) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, map.slot)
            mstore(0x00, shr(3, index))
            let s := keccak256(0x00, 0x40) // Storage slot.
            let o := shl(5, and(index, 7)) // Storage slot offset (bits).
            let v := sload(s) // Storage slot value.
            let m := 0xffffffff // Value mask.
            sstore(s, xor(v, shl(o, and(m, xor(shr(o, v), value)))))
        }
    }

    /// @dev Returns the uint40 value at `index` in `map`.
    function get(Uint40Map storage map, uint256 index) internal view returns (uint40 result) {
        unchecked {
            result = uint40(map.map[index / 6] >> ((index % 6) * 40));
        }
    }

    /// @dev Updates the uint40 value at `index` in `map`.
    function set(Uint40Map storage map, uint256 index, uint40 value) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, map.slot)
            mstore(0x00, div(index, 6))
            let s := keccak256(0x00, 0x40) // Storage slot.
            let o := mul(40, mod(index, 6)) // Storage slot offset (bits).
            let v := sload(s) // Storage slot value.
            let m := 0xffffffffff // Value mask.
            sstore(s, xor(v, shl(o, and(m, xor(shr(o, v), value)))))
        }
    }

    /// @dev Returns the uint64 value at `index` in `map`.
    function get(Uint64Map storage map, uint256 index) internal view returns (uint64 result) {
        result = uint64(map.map[index >> 2] >> ((index & 3) << 6));
    }

    /// @dev Updates the uint64 value at `index` in `map`.
    function set(Uint64Map storage map, uint256 index, uint64 value) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, map.slot)
            mstore(0x00, shr(2, index))
            let s := keccak256(0x00, 0x40) // Storage slot.
            let o := shl(6, and(index, 3)) // Storage slot offset (bits).
            let v := sload(s) // Storage slot value.
            let m := 0xffffffffffffffff // Value mask.
            sstore(s, xor(v, shl(o, and(m, xor(shr(o, v), value)))))
        }
    }

    /// @dev Returns the uint128 value at `index` in `map`.
    function get(Uint128Map storage map, uint256 index) internal view returns (uint128 result) {
        result = uint128(map.map[index >> 1] >> ((index & 1) << 7));
    }

    /// @dev Updates the uint128 value at `index` in `map`.
    function set(Uint128Map storage map, uint256 index, uint128 value) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, map.slot)
            mstore(0x00, shr(1, index))
            let s := keccak256(0x00, 0x40) // Storage slot.
            let o := shl(7, and(index, 1)) // Storage slot offset (bits).
            let v := sload(s) // Storage slot value.
            let m := 0xffffffffffffffffffffffffffffffff // Value mask.
            sstore(s, xor(v, shl(o, and(m, xor(shr(o, v), value)))))
        }
    }
}

// File: src/Nchart.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.21;

import "@solady/tokens/ERC20.sol";
import "@solady/auth/Ownable.sol";
import "@openzeppelin/token/ERC20/IERC20.sol";
import "./IUniswapV2Factory.sol";
import "./IUniswapV2Router02.sol";

contract Nchart is ERC20, Ownable {
    struct User {
        bool isBlacklisted;
        bool isAutomatedMarketMaker;
        bool isExcludedFromFees;
        bool isExcludedFromMaxTransactionAmount;
    }

    struct Fees {
        uint8 buy;
        uint8 sell;
        uint8 liquidity;
        uint8 revShare;
        uint8 team;
    }

    struct Settings {
        bool limitsInEffect;
        bool swapEnabled;
        bool blacklistRenounced;
        bool feeChangeRenounced;
        bool tradingActive;
        /// @dev Upon enabling trading, record the end block for bot protection fee
        /// @dev This fee is a 90% fee that is reduced by 5% every block for 18 blocks.
        uint216 endBlock;
    }

    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;

    /// @dev Constant to access the allowance slot
    uint256 private constant _ALLOWANCE_SLOT_SEED = 0x7f5e9f20;
    uint256 public constant MAX_SUPPLY = 10_000_000 * 1e18;
    uint256 public constant MIN_SWAP_AMOUNT = MAX_SUPPLY / 100_000; // 0.001%
    uint256 public constant MAX_SWAP_AMOUNT = MAX_SUPPLY * 5 / 1_000; // 0.5%

    uint256 public maxTransactionAmount;
    uint256 public swapTokensAtAmount;
    uint256 public maxWallet;

    address public revShareWallet;
    address public teamWallet;

    bool private _swapping;

    uint256 public tokensForBotProtection;

    Fees public feeAmounts;

    Settings private settings = Settings({
        limitsInEffect: true,
        swapEnabled: true,
        blacklistRenounced: false,
        feeChangeRenounced: false,
        tradingActive: false,
        endBlock: uint216(0)
    });

    mapping(address => User) private _users;

    event ExcludeFromFees(address indexed account, bool isExcluded);
    event ExcludeFromMaxTransaction(address indexed account, bool isExcluded);
    event FailedSwapBackTransfer(address indexed destination, uint256 amount);
    event FeesUpdated(uint8 buyFee, uint8 sellFee, uint8 revSharePercent, uint8 liquidityPercent, uint8 teamPercent);
    event MaxTransactionAmountUpdated(uint256 newAmount, uint256 oldAmount);
    event MaxWalletAmountUpdated(uint256 newAmount, uint256 oldAmount);
    event RevShareWalletUpdated(address indexed newWallet, address indexed oldWallet);
    event SetAutomatedMarketMakerPair(address indexed pair, bool value);
    event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived);
    event SwapTokensAtAmountUpdated(uint256 newAmount, uint256 oldAmount);
    event TeamWalletUpdated(address indexed newWallet, address indexed oldWallet);
    event UpdateUniswapV2Router(address indexed newAddress, address indexed oldAddress);

    error Nchart__BlacklistModificationDisabled();
    error Nchart__BuyAmountGreaterThanMax();
    error Nchart__CannotBlacklistLPPair();
    error Nchart__CannotBlacklistRouter();
    error Nchart__CannotRemovePairFromAMMs();
    error Nchart__CannotSetWalletToAddressZero();
    error Nchart__CannotTransferFromAddressZero();
    error Nchart__CannotTransferToAddressZero();
    error Nchart__ErrorWithdrawingEth();
    error Nchart__FeeChangeRenounced();
    error Nchart__MaxFeeFivePercent();
    error Nchart__MaxTransactionTooLow();
    error Nchart__MaxWalletAmountExceeded();
    error Nchart__MaxWalletAmountTooLow();
    error Nchart__OnlyOwner();
    error Nchart__ReceiverBlacklisted();
    error Nchart__ReceiverCannotBeAddressZero();
    error Nchart__SellAmountGreaterThanMax();
    error Nchart__SenderBlacklisted();
    error Nchart__StuckEthWithdrawError();
    error Nchart__SwapAmountGreaterThanMaximum();
    error Nchart__SwapAmountLowerThanMinimum();
    error Nchart__TokenAddressCannotBeAddressZero();
    error Nchart__TradingNotActive();

    constructor(address ownerWallet, address teamWallet_, address revShareWallet_, address routerAddress) {
        _initializeOwner(ownerWallet);
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(routerAddress);

        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());

        maxTransactionAmount = MAX_SUPPLY / 100; // 1%
        maxWallet = MAX_SUPPLY / 100; // 1%
        swapTokensAtAmount = MAX_SUPPLY * 5 / 10_000; // 0.05%

        feeAmounts = Fees({buy: 5, sell: 5, revShare: 0, liquidity: 25, team: 75});

        revShareWallet = revShareWallet_;
        teamWallet = teamWallet_;

        _users[teamWallet_] = User({
            isExcludedFromFees: true,
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isBlacklisted: false
        });
        _users[address(this)] = User({
            isExcludedFromFees: true,
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isBlacklisted: false
        });
        _users[address(0xdead)] = User({
            isExcludedFromFees: true,
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isBlacklisted: false
        });
        _users[address(ownerWallet)] = User({
            isExcludedFromFees: true,
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isBlacklisted: false
        });

        _users[address(uniswapV2Router)] = User({
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: false,
            isExcludedFromFees: false,
            isBlacklisted: false
        });
        _users[address(uniswapV2Pair)] = User({
            isExcludedFromMaxTransactionAmount: true,
            isAutomatedMarketMaker: true,
            isExcludedFromFees: false,
            isBlacklisted: false
        });

        _mint(ownerWallet, MAX_SUPPLY);
    }

    receive() external payable {}

    function name() public pure override returns (string memory) {
        return "Nchart";
    }

    function symbol() public pure override returns (string memory) {
        return "CHART";
    }

    function enableTrading() public {
        _requireIsOwner();
        settings.endBlock = uint216(block.number) + 19;
        settings.tradingActive = true;
    }

    // remove limits after token is stable
    function removeLimits() external {
        _requireIsOwner();
        settings.limitsInEffect = false;
    }

    // change the minimum amount of tokens to sell from fees
    function updateSwapTokensAtAmount(uint256 newAmount) external {
        _requireIsOwner();
        if (newAmount < MIN_SWAP_AMOUNT) {
            revert Nchart__SwapAmountLowerThanMinimum();
        }
        if (newAmount > MAX_SWAP_AMOUNT) {
            revert Nchart__SwapAmountGreaterThanMaximum();
        }
        uint256 oldSwapAmount = swapTokensAtAmount;
        swapTokensAtAmount = newAmount;
        emit SwapTokensAtAmountUpdated(newAmount, oldSwapAmount);
    }

    function updateMaxTransactionAmount(uint256 newAmount) external {
        _requireIsOwner();
        if (newAmount < MAX_SUPPLY * 5 / 1000) {
            revert Nchart__MaxTransactionTooLow();
        }
        uint256 oldMaxTransactionAmount = maxTransactionAmount;
        maxTransactionAmount = newAmount;
        emit MaxTransactionAmountUpdated(newAmount, oldMaxTransactionAmount);
    }

    function updateMaxWalletAmount(uint256 newNum) external {
        _requireIsOwner();
        if (newNum < MAX_SUPPLY / 100) {
            revert Nchart__MaxWalletAmountTooLow();
        }
        uint256 oldMaxWallet = maxWallet;
        maxWallet = newNum;
        emit MaxWalletAmountUpdated(newNum, oldMaxWallet);
    }

    // only use to disable contract sales if absolutely necessary (emergency use only)
    function updateSwapEnabled(bool enabled) external {
        _requireIsOwner();
        settings.swapEnabled = enabled;
    }

    function updateBuyFees(uint8 revShareFee, uint8 liquidityFee, uint8 teamFee) external {
        _requireIsOwner();

        if (settings.feeChangeRenounced) {
            revert Nchart__FeeChangeRenounced();
        }

        uint8 totalFees = revShareFee + liquidityFee + teamFee;
        if (totalFees > 5) {
            revert Nchart__MaxFeeFivePercent();
        }

        uint8 sellFee = feeAmounts.sell;
        uint8 revPercent = revShareFee * 100 / totalFees;
        uint8 liqPercent = liquidityFee * 100 / totalFees;
        uint8 teamPercent = 100 - revPercent - liqPercent;

        feeAmounts =
            Fees({buy: totalFees, sell: sellFee, revShare: revPercent, liquidity: liqPercent, team: teamPercent});
        emit FeesUpdated(totalFees, sellFee, revPercent, liqPercent, teamPercent);
    }

    function updateSellFees(uint8 revShareFee, uint8 liquidityFee, uint8 teamFee) external {
        _requireIsOwner();

        if (settings.feeChangeRenounced) {
            revert Nchart__FeeChangeRenounced();
        }

        uint8 totalFees = revShareFee + liquidityFee + teamFee;
        if (totalFees > 5) {
            revert Nchart__MaxFeeFivePercent();
        }

        uint8 buyFee = feeAmounts.buy;
        uint8 revPercent = revShareFee * 100 / totalFees;
        uint8 liqPercent = liquidityFee * 100 / totalFees;
        uint8 teamPercent = 100 - revPercent - liqPercent;

        feeAmounts =
            Fees({buy: buyFee, sell: totalFees, revShare: revPercent, liquidity: liqPercent, team: teamPercent});
        emit FeesUpdated(buyFee, totalFees, revPercent, liqPercent, teamPercent);
    }

    function excludeFromFees(address account, bool excluded) external {
        _requireIsOwner();
        _users[account].isExcludedFromFees = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    function excludeFromMaxTransaction(address account, bool isExcluded) external {
        _requireIsOwner();
        _users[account].isExcludedFromMaxTransactionAmount = isExcluded;
        emit ExcludeFromMaxTransaction(account, isExcluded);
    }

    function setAutomatedMarketMakerPair(address pair, bool value) external {
        _requireIsOwner();
        if (pair == uniswapV2Pair) {
            revert Nchart__CannotRemovePairFromAMMs();
        }

        _users[pair].isAutomatedMarketMaker = value;
        emit SetAutomatedMarketMakerPair(pair, value);
    }

    function updateRevShareWallet(address newWallet) external {
        _requireIsOwner();
        if (newWallet == address(0)) {
            revert Nchart__CannotSetWalletToAddressZero();
        }
        address oldWallet = revShareWallet;
        revShareWallet = newWallet;
        emit RevShareWalletUpdated(newWallet, oldWallet);
    }

    function updateTeamWallet(address newWallet) external {
        _requireIsOwner();
        if (newWallet == address(0)) {
            revert Nchart__CannotSetWalletToAddressZero();
        }
        address oldWallet = teamWallet;
        teamWallet = newWallet;
        emit TeamWalletUpdated(newWallet, oldWallet);
    }

    function withdrawStuckChart(uint256 amount) external {
        _requireIsOwner();
        uint256 transferAmount;
        if (amount == 0) {
            transferAmount = balanceOf(address(this));
        } else {
            transferAmount = amount;
        }
        super._transfer(address(this), msg.sender, transferAmount);
    }

    function withdrawStuckToken(address _token) external {
        _requireIsOwner();
        if (_token == address(0)) {
            revert Nchart__TokenAddressCannotBeAddressZero();
        }
        uint256 _contractBalance = IERC20(_token).balanceOf(address(this));
        IERC20(_token).transfer(msg.sender, _contractBalance);
    }

    function withdrawStuckEth() external {
        _requireIsOwner();
        (bool success,) = msg.sender.call{value: address(this).balance}("");
        if (!success) {
            revert Nchart__ErrorWithdrawingEth();
        }
    }

    function renounceBlacklist() external {
        _requireIsOwner();
        settings.blacklistRenounced = true;
    }

    function renounceFeeChange() external {
        _requireIsOwner();
        settings.feeChangeRenounced = true;
    }

    function blacklist(address account) external {
        _requireIsOwner();
        if (settings.blacklistRenounced) {
            revert Nchart__BlacklistModificationDisabled();
        }
        if (account == uniswapV2Pair) {
            revert Nchart__CannotBlacklistLPPair();
        }
        if (account == address(uniswapV2Router)) {
            revert Nchart__CannotBlacklistRouter();
        }
        _users[account].isBlacklisted = true;
    }

    // @dev unblacklist address; not affected by blacklistRenounced incase team wants to unblacklist v3 pools down the
    // @dev road
    function unblacklist(address account) external {
        _requireIsOwner();
        _users[account].isBlacklisted = false;
    }

    function isExcludedFromFees(address account) external view returns (bool) {
        return _users[account].isExcludedFromFees;
    }

    function isExcludedFromMaxTransactionAmount(address account) external view returns (bool) {
        return _users[account].isExcludedFromMaxTransactionAmount;
    }

    function isAutomatedMarketMakerPair(address pair) external view returns (bool) {
        return _users[pair].isAutomatedMarketMaker;
    }

    function isBlacklisted(address account) external view returns (bool) {
        return _users[account].isBlacklisted;
    }

    function isSwapEnabled() external view returns (bool) {
        return settings.swapEnabled;
    }

    function isBlacklistRenounced() external view returns (bool) {
        return settings.blacklistRenounced;
    }

    function isFeeChangeRenounced() external view returns (bool) {
        return settings.feeChangeRenounced;
    }

    function isTradingActive() external view returns (bool) {
        return settings.tradingActive;
    }

    function isLimitInEffect() external view returns (bool) {
        return settings.limitsInEffect;
    }

    function transfer(address to, uint256 amount) public override returns (bool) {
        _transfer(msg.sender, to, amount);
        return true;
    }

    function transferFrom(address from, address to, uint256 amount) public override returns (bool) {
        // Check allowance and reduce it if used, reverts with `InsufficientAllowance()` if not approved.
        assembly {
            let from_ := shl(96, from)
            // Compute the allowance slot and load its value.
            mstore(0x20, caller())
            mstore(0x0c, or(from_, _ALLOWANCE_SLOT_SEED))
            let allowanceSlot := keccak256(0x0c, 0x34)
            let allowance_ := sload(allowanceSlot)
            // If the allowance is not the maximum uint256 value.
            if iszero(eq(allowance_, not(0))) {
                // Revert if the amount to be transferred exceeds the allowance.
                if gt(amount, allowance_) {
                    mstore(0x00, 0x13be252b) // `InsufficientAllowance()`.
                    revert(0x1c, 0x04)
                }
                // Subtract and store the updated allowance.
                sstore(allowanceSlot, sub(allowance_, amount))
            }
        }
        _transfer(from, to, amount);
        return true;
    }

    function _transfer(address from, address to, uint256 amount) internal override {
        // Ignore mints, burns not enabled
        if (from == address(0)) {
            revert Nchart__CannotTransferFromAddressZero();
        }
        if (to == address(0)) {
            revert Nchart__CannotTransferToAddressZero();
        }

        User memory fromData = _users[from];
        User memory toData = _users[to];
        Settings memory settingCache = settings;

        if (!settingCache.tradingActive) {
            if (!fromData.isExcludedFromFees) {
                if (!toData.isExcludedFromFees) {
                    revert Nchart__TradingNotActive();
                }
            }
        }

        // Apply blacklist protection
        if (fromData.isBlacklisted) {
            revert Nchart__SenderBlacklisted();
        }
        if (toData.isBlacklisted) {
            revert Nchart__ReceiverBlacklisted();
        }

        // If zero amount, continue
        if (amount == 0) {
            return;
        }

        bool excludedFromFees = fromData.isExcludedFromFees || toData.isExcludedFromFees;

        // Cache transaction type for reference.
        // 1 = Buy
        // 2 = Sell
        // 3 = Transfer
        uint8 txType = 3;

        if (fromData.isAutomatedMarketMaker) {
            // Buys originate from the AMM pair
            txType = 1;
        } else if (toData.isAutomatedMarketMaker) {
            // Sells send funds to AMM pair
            txType = 2;
        }

        if (!_swapping) {
            if (settingCache.limitsInEffect) {
                //when buy
                if (txType == 1 && !toData.isExcludedFromMaxTransactionAmount) {
                    if (amount > maxTransactionAmount) {
                        revert Nchart__BuyAmountGreaterThanMax();
                    }
                    if (amount + balanceOf(to) > maxWallet) {
                        revert Nchart__MaxWalletAmountExceeded();
                    }
                }
                //when sell
                else if (txType == 2 && !fromData.isExcludedFromMaxTransactionAmount) {
                    if (amount > maxTransactionAmount) {
                        revert Nchart__SellAmountGreaterThanMax();
                    }
                } else if (!toData.isExcludedFromMaxTransactionAmount) {
                    if (amount + balanceOf(to) > maxWallet) {
                        revert Nchart__MaxWalletAmountExceeded();
                    }
                }
            }

            if (settingCache.swapEnabled) {
                // Only sells will trigger the fee swap
                if (txType == 2) {
                    if (balanceOf(address(this)) >= swapTokensAtAmount) {
                        _swapping = true;
                        _swapBack();
                        _swapping = false;
                    }
                }
            }
        }

        if (txType < 3) {
            bool takeFee = !_swapping;

            // if any account belongs to _isExcludedFromFee account then remove the fee
            if (excludedFromFees) {
                takeFee = false;
            }
            uint256 fees = 0;
            // only take fees on buys/sells, do not take on wallet transfers
            if (takeFee) {
                Fees memory feeCache = feeAmounts;
                // on sell
                if (txType == 2) {
                    if (feeCache.sell > 0) {
                        fees = amount * feeCache.sell / 100;
                    }
                }
                // on buy
                else if (txType == 1) {
                    if (feeCache.buy > 0) {
                        fees = amount * feeCache.buy / 100;
                    }
                }

                if (block.number < settingCache.endBlock) {
                    uint256 blocksLeft = settingCache.endBlock - block.number;
                    uint256 botFeeMultiplier = 90;

                    // Apply sniper protection - first 18 blocks have a fee reduced 5% each block.
                    if (blocksLeft < 18) {
                        botFeeMultiplier -= (5 * (18 - blocksLeft));
                    }
                    uint256 botFee = (amount * botFeeMultiplier) / 100;
                    super._transfer(from, teamWallet, botFee);
                    amount -= botFee;
                    tokensForBotProtection += botFee;
                }

                amount -= fees;

                if (fees > 0) {
                    super._transfer(from, address(this), fees);
                }
            }
        }
        super._transfer(from, to, amount);
    }

    function _swapTokensForEth(uint256 tokenAmount) internal {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);
        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

    function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) internal {
        // approve token transfer to cover all possible scenarios
        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // add the liquidity
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0, // slippage is unavoidable
            0, // slippage is unavoidable
            owner(),
            block.timestamp
        );
    }

    function _swapBack() internal {
        // Cache values
        uint256 contractBalance = balanceOf(address(this));
        Fees memory feeCache = feeAmounts;
        bool success;

        if (contractBalance == 0) {
            return;
        }

        // Prevent too many tokens from being swapped
        uint256 maxAmount = swapTokensAtAmount * 20;
        if (contractBalance > maxAmount) {
            contractBalance = maxAmount;
        }

        uint256 liquidityAmount = contractBalance * feeCache.liquidity / 100;

        // Halve the amount of liquidity tokens
        uint256 liquidityTokens = liquidityAmount - (liquidityAmount / 2);
        uint256 amountToSwapForETH = contractBalance - liquidityTokens;

        uint256 initialETHBalance = address(this).balance;

        _swapTokensForEth(amountToSwapForETH);

        uint256 ethBalance = address(this).balance - initialETHBalance;

        uint256 ethForRevShare = ethBalance * feeCache.revShare / 100;
        uint256 ethForTeam = ethBalance * feeCache.team / 100;
        uint256 ethForLiquidity = ethBalance - ethForRevShare - ethForTeam;

        if (liquidityTokens > 0 && ethForLiquidity > 0) {
            _addLiquidity(liquidityTokens, ethForLiquidity);
            emit SwapAndLiquify(amountToSwapForETH, ethForLiquidity);
        }

        address teamWallet_ = teamWallet;

        (success,) = address(teamWallet_).call{value: ethForTeam}("");
        if (!success) {
            emit FailedSwapBackTransfer(teamWallet_, ethForTeam);
        }

        if (ethForRevShare > 0) {
            (success,) = address(revShareWallet).call{value: ethForRevShare}("");
            if (!success) {
                emit FailedSwapBackTransfer(revShareWallet, ethForRevShare);
            }
        }
    }

    function _requireIsOwner() internal view {
        if (msg.sender != owner()) {
            revert Nchart__OnlyOwner();
        }
    }
}

// File: src/IUniswapV2Router02.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2;

import "./IUniswapV2Router01.sol";

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

// File: lib/solady/src/auth/Ownable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice Simple single owner authorization mixin.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol)
/// @dev While the ownable portion follows
/// [EIP-173](https://eips.ethereum.org/EIPS/eip-173) for compatibility,
/// the nomenclature for the 2-step ownership handover may be unique to this codebase.
abstract contract Ownable {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The caller is not authorized to call the function.
    error Unauthorized();

    /// @dev The `newOwner` cannot be the zero address.
    error NewOwnerIsZeroAddress();

    /// @dev The `pendingOwner` does not have a valid handover request.
    error NoHandoverRequest();

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The ownership is transferred from `oldOwner` to `newOwner`.
    /// This event is intentionally kept the same as OpenZeppelin's Ownable to be
    /// compatible with indexers and [EIP-173](https://eips.ethereum.org/EIPS/eip-173),
    /// despite it not being as lightweight as a single argument event.
    event OwnershipTransferred(address indexed oldOwner, address indexed newOwner);

    /// @dev An ownership handover to `pendingOwner` has been requested.
    event OwnershipHandoverRequested(address indexed pendingOwner);

    /// @dev The ownership handover to `pendingOwner` has been canceled.
    event OwnershipHandoverCanceled(address indexed pendingOwner);

    /// @dev `keccak256(bytes("OwnershipTransferred(address,address)"))`.
    uint256 private constant _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE =
        0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0;

    /// @dev `keccak256(bytes("OwnershipHandoverRequested(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE =
        0xdbf36a107da19e49527a7176a1babf963b4b0ff8cde35ee35d6cd8f1f9ac7e1d;

    /// @dev `keccak256(bytes("OwnershipHandoverCanceled(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE =
        0xfa7b8eab7da67f412cc9575ed43464468f9bfbae89d1675917346ca6d8fe3c92;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STORAGE                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The owner slot is given by: `not(_OWNER_SLOT_NOT)`.
    /// It is intentionally chosen to be a high value
    /// to avoid collision with lower slots.
    /// The choice of manual storage layout is to enable compatibility
    /// with both regular and upgradeable contracts.
    uint256 private constant _OWNER_SLOT_NOT = 0x8b78c6d8;

    /// The ownership handover slot of `newOwner` is given by:
    /// ```
    ///     mstore(0x00, or(shl(96, user), _HANDOVER_SLOT_SEED))
    ///     let handoverSlot := keccak256(0x00, 0x20)
    /// ```
    /// It stores the expiry timestamp of the two-step ownership handover.
    uint256 private constant _HANDOVER_SLOT_SEED = 0x389a75e1;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     INTERNAL FUNCTIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Initializes the owner directly without authorization guard.
    /// This function must be called upon initialization,
    /// regardless of whether the contract is upgradeable or not.
    /// This is to enable generalization to both regular and upgradeable contracts,
    /// and to save gas in case the initial owner is not the caller.
    /// For performance reasons, this function will not check if there
    /// is an existing owner.
    function _initializeOwner(address newOwner) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Clean the upper 96 bits.
            newOwner := shr(96, shl(96, newOwner))
            // Store the new value.
            sstore(not(_OWNER_SLOT_NOT), newOwner)
            // Emit the {OwnershipTransferred} event.
            log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
        }
    }

    /// @dev Sets the owner directly without authorization guard.
    function _setOwner(address newOwner) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            let ownerSlot := not(_OWNER_SLOT_NOT)
            // Clean the upper 96 bits.
            newOwner := shr(96, shl(96, newOwner))
            // Emit the {OwnershipTransferred} event.
            log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
            // Store the new value.
            sstore(ownerSlot, newOwner)
        }
    }

    /// @dev Throws if the sender is not the owner.
    function _checkOwner() internal view virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // If the caller is not the stored owner, revert.
            if iszero(eq(caller(), sload(not(_OWNER_SLOT_NOT)))) {
                mstore(0x00, 0x82b42900) // `Unauthorized()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Returns how long a two-step ownership handover is valid for in seconds.
    /// Override to return a different value if needed.
    /// Made internal to conserve bytecode. Wrap it in a public function if needed.
    function _ownershipHandoverValidFor() internal view virtual returns (uint64) {
        return 48 * 3600;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  PUBLIC UPDATE FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Allows the owner to transfer the ownership to `newOwner`.
    function transferOwnership(address newOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(shl(96, newOwner)) {
                mstore(0x00, 0x7448fbae) // `NewOwnerIsZeroAddress()`.
                revert(0x1c, 0x04)
            }
        }
        _setOwner(newOwner);
    }

    /// @dev Allows the owner to renounce their ownership.
    function renounceOwnership() public payable virtual onlyOwner {
        _setOwner(address(0));
    }

    /// @dev Request a two-step ownership handover to the caller.
    /// The request will automatically expire in 48 hours (172800 seconds) by default.
    function requestOwnershipHandover() public payable virtual {
        unchecked {
            uint256 expires = block.timestamp + _ownershipHandoverValidFor();
            /// @solidity memory-safe-assembly
            assembly {
                // Compute and set the handover slot to `expires`.
                mstore(0x0c, _HANDOVER_SLOT_SEED)
                mstore(0x00, caller())
                sstore(keccak256(0x0c, 0x20), expires)
                // Emit the {OwnershipHandoverRequested} event.
                log2(0, 0, _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE, caller())
            }
        }
    }

    /// @dev Cancels the two-step ownership handover to the caller, if any.
    function cancelOwnershipHandover() public payable virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, caller())
            sstore(keccak256(0x0c, 0x20), 0)
            // Emit the {OwnershipHandoverCanceled} event.
            log2(0, 0, _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE, caller())
        }
    }

    /// @dev Allows the owner to complete the two-step ownership handover to `pendingOwner`.
    /// Reverts if there is no existing ownership handover requested by `pendingOwner`.
    function completeOwnershipHandover(address pendingOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            let handoverSlot := keccak256(0x0c, 0x20)
            // If the handover does not exist, or has expired.
            if gt(timestamp(), sload(handoverSlot)) {
                mstore(0x00, 0x6f5e8818) // `NoHandoverRequest()`.
                revert(0x1c, 0x04)
            }
            // Set the handover slot to 0.
            sstore(handoverSlot, 0)
        }
        _setOwner(pendingOwner);
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   PUBLIC READ FUNCTIONS                    */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the owner of the contract.
    function owner() public view virtual returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := sload(not(_OWNER_SLOT_NOT))
        }
    }

    /// @dev Returns the expiry timestamp for the two-step ownership handover to `pendingOwner`.
    function ownershipHandoverExpiresAt(address pendingOwner)
        public
        view
        virtual
        returns (uint256 result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the handover slot.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            // Load the handover slot.
            result := sload(keccak256(0x0c, 0x20))
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         MODIFIERS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Marks a function as only callable by the owner.
    modifier onlyOwner() virtual {
        _checkOwner();
        _;
    }
}

// File: lib/solady/src/tokens/ERC20.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice Simple ERC20 + EIP-2612 implementation.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol)
///
/// @dev Note:
/// The ERC20 standard allows minting and transferring to and from the zero address,
/// minting and transferring zero tokens, as well as self-approvals.
/// For performance, this implementation WILL NOT revert for such actions.
/// Please add any checks with overrides if desired.
abstract contract ERC20 {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The total supply has overflowed.
    error TotalSupplyOverflow();

    /// @dev The allowance has overflowed.
    error AllowanceOverflow();

    /// @dev The allowance has underflowed.
    error AllowanceUnderflow();

    /// @dev Insufficient balance.
    error InsufficientBalance();

    /// @dev Insufficient allowance.
    error InsufficientAllowance();

    /// @dev The permit is invalid.
    error InvalidPermit();

    /// @dev The permit has expired.
    error PermitExpired();

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Emitted when `amount` tokens is transferred from `from` to `to`.
    event Transfer(address indexed from, address indexed to, uint256 amount);

    /// @dev Emitted when `amount` tokens is approved by `owner` to be used by `spender`.
    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /// @dev `keccak256(bytes("Transfer(address,address,uint256)"))`.
    uint256 private constant _TRANSFER_EVENT_SIGNATURE =
        0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;

    /// @dev `keccak256(bytes("Approval(address,address,uint256)"))`.
    uint256 private constant _APPROVAL_EVENT_SIGNATURE =
        0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STORAGE                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The storage slot for the total supply.
    uint256 private constant _TOTAL_SUPPLY_SLOT = 0x05345cdf77eb68f44c;

    /// @dev The balance slot of `owner` is given by:
    /// ```
    ///     mstore(0x0c, _BALANCE_SLOT_SEED)
    ///     mstore(0x00, owner)
    ///     let balanceSlot := keccak256(0x0c, 0x20)
    /// ```
    uint256 private constant _BALANCE_SLOT_SEED = 0x87a211a2;

    /// @dev The allowance slot of (`owner`, `spender`) is given by:
    /// ```
    ///     mstore(0x20, spender)
    ///     mstore(0x0c, _ALLOWANCE_SLOT_SEED)
    ///     mstore(0x00, owner)
    ///     let allowanceSlot := keccak256(0x0c, 0x34)
    /// ```
    uint256 private constant _ALLOWANCE_SLOT_SEED = 0x7f5e9f20;

    /// @dev The nonce slot of `owner` is given by:
    /// ```
    ///     mstore(0x0c, _NONCES_SLOT_SEED)
    ///     mstore(0x00, owner)
    ///     let nonceSlot := keccak256(0x0c, 0x20)
    /// ```
    uint256 private constant _NONCES_SLOT_SEED = 0x38377508;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       ERC20 METADATA                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the name of the token.
    function name() public view virtual returns (string memory);

    /// @dev Returns the symbol of the token.
    function symbol() public view virtual returns (string memory);

    /// @dev Returns the decimals places of the token.
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           ERC20                            */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the amount of tokens in existence.
    function totalSupply() public view virtual returns (uint256 result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := sload(_TOTAL_SUPPLY_SLOT)
        }
    }

    /// @dev Returns the amount of tokens owned by `owner`.
    function balanceOf(address owner) public view virtual returns (uint256 result) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, owner)
            result := sload(keccak256(0x0c, 0x20))
        }
    }

    /// @dev Returns the amount of tokens that `spender` can spend on behalf of `owner`.
    function allowance(address owner, address spender)
        public
        view
        virtual
        returns (uint256 result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, owner)
            result := sload(keccak256(0x0c, 0x34))
        }
    }

    /// @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
    ///
    /// Emits a {Approval} event.
    function approve(address spender, uint256 amount) public virtual returns (bool) {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the allowance slot and store the amount.
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, caller())
            sstore(keccak256(0x0c, 0x34), amount)
            // Emit the {Approval} event.
            mstore(0x00, amount)
            log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, caller(), shr(96, mload(0x2c)))
        }
        return true;
    }

    /// @dev Atomically increases the allowance granted to `spender` by the caller.
    ///
    /// Emits a {Approval} event.
    function increaseAllowance(address spender, uint256 difference) public virtual returns (bool) {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the allowance slot and load its value.
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, caller())
            let allowanceSlot := keccak256(0x0c, 0x34)
            let allowanceBefore := sload(allowanceSlot)
            // Add to the allowance.
            let allowanceAfter := add(allowanceBefore, difference)
            // Revert upon overflow.
            if lt(allowanceAfter, allowanceBefore) {
                mstore(0x00, 0xf9067066) // `AllowanceOverflow()`.
                revert(0x1c, 0x04)
            }
            // Store the updated allowance.
            sstore(allowanceSlot, allowanceAfter)
            // Emit the {Approval} event.
            mstore(0x00, allowanceAfter)
            log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, caller(), shr(96, mload(0x2c)))
        }
        return true;
    }

    /// @dev Atomically decreases the allowance granted to `spender` by the caller.
    ///
    /// Emits a {Approval} event.
    function decreaseAllowance(address spender, uint256 difference) public virtual returns (bool) {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the allowance slot and load its value.
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, caller())
            let allowanceSlot := keccak256(0x0c, 0x34)
            let allowanceBefore := sload(allowanceSlot)
            // Revert if will underflow.
            if lt(allowanceBefore, difference) {
                mstore(0x00, 0x8301ab38) // `AllowanceUnderflow()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated allowance.
            let allowanceAfter := sub(allowanceBefore, difference)
            sstore(allowanceSlot, allowanceAfter)
            // Emit the {Approval} event.
            mstore(0x00, allowanceAfter)
            log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, caller(), shr(96, mload(0x2c)))
        }
        return true;
    }

    /// @dev Transfer `amount` tokens from the caller to `to`.
    ///
    /// Requirements:
    /// - `from` must at least have `amount`.
    ///
    /// Emits a {Transfer} event.
    function transfer(address to, uint256 amount) public virtual returns (bool) {
        _beforeTokenTransfer(msg.sender, to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the balance slot and load its value.
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, caller())
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Compute the balance slot of `to`.
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance of `to`.
            // Will not overflow because the sum of all user balances
            // cannot exceed the maximum uint256 value.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, caller(), shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(msg.sender, to, amount);
        return true;
    }

    /// @dev Transfers `amount` tokens from `from` to `to`.
    ///
    /// Note: Does not update the allowance if it is the maximum uint256 value.
    ///
    /// Requirements:
    /// - `from` must at least have `amount`.
    /// - The caller must have at least `amount` of allowance to transfer the tokens of `from`.
    ///
    /// Emits a {Transfer} event.
    function transferFrom(address from, address to, uint256 amount) public virtual returns (bool) {
        _beforeTokenTransfer(from, to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            let from_ := shl(96, from)
            // Compute the allowance slot and load its value.
            mstore(0x20, caller())
            mstore(0x0c, or(from_, _ALLOWANCE_SLOT_SEED))
            let allowanceSlot := keccak256(0x0c, 0x34)
            let allowance_ := sload(allowanceSlot)
            // If the allowance is not the maximum uint256 value.
            if iszero(eq(allowance_, not(0))) {
                // Revert if the amount to be transferred exceeds the allowance.
                if gt(amount, allowance_) {
                    mstore(0x00, 0x13be252b) // `InsufficientAllowance()`.
                    revert(0x1c, 0x04)
                }
                // Subtract and store the updated allowance.
                sstore(allowanceSlot, sub(allowance_, amount))
            }
            // Compute the balance slot and load its value.
            mstore(0x0c, or(from_, _BALANCE_SLOT_SEED))
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Compute the balance slot of `to`.
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance of `to`.
            // Will not overflow because the sum of all user balances
            // cannot exceed the maximum uint256 value.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, from_), shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(from, to, amount);
        return true;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          EIP-2612                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the current nonce for `owner`.
    /// This value is used to compute the signature for EIP-2612 permit.
    function nonces(address owner) public view virtual returns (uint256 result) {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the nonce slot and load its value.
            mstore(0x0c, _NONCES_SLOT_SEED)
            mstore(0x00, owner)
            result := sload(keccak256(0x0c, 0x20))
        }
    }

    /// @dev Sets `value` as the allowance of `spender` over the tokens of `owner`,
    /// authorized by a signed approval by `owner`.
    ///
    /// Emits a {Approval} event.
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        bytes32 domainSeparator = DOMAIN_SEPARATOR();
        /// @solidity memory-safe-assembly
        assembly {
            // Grab the free memory pointer.
            let m := mload(0x40)
            // Revert if the block timestamp greater than `deadline`.
            if gt(timestamp(), deadline) {
                mstore(0x00, 0x1a15a3cc) // `PermitExpired()`.
                revert(0x1c, 0x04)
            }
            // Clean the upper 96 bits.
            owner := shr(96, shl(96, owner))
            spender := shr(96, shl(96, spender))
            // Compute the nonce slot and load its value.
            mstore(0x0c, _NONCES_SLOT_SEED)
            mstore(0x00, owner)
            let nonceSlot := keccak256(0x0c, 0x20)
            let nonceValue := sload(nonceSlot)
            // Increment and store the updated nonce.
            sstore(nonceSlot, add(nonceValue, 1))
            // Prepare the inner hash.
            // `keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")`.
            // forgefmt: disable-next-item
            mstore(m, 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9)
            mstore(add(m, 0x20), owner)
            mstore(add(m, 0x40), spender)
            mstore(add(m, 0x60), value)
            mstore(add(m, 0x80), nonceValue)
            mstore(add(m, 0xa0), deadline)
            // Prepare the outer hash.
            mstore(0, 0x1901)
            mstore(0x20, domainSeparator)
            mstore(0x40, keccak256(m, 0xc0))
            // Prepare the ecrecover calldata.
            mstore(0, keccak256(0x1e, 0x42))
            mstore(0x20, and(0xff, v))
            mstore(0x40, r)
            mstore(0x60, s)
            pop(staticcall(gas(), 1, 0, 0x80, 0x20, 0x20))
            // If the ecrecover fails, the returndatasize will be 0x00,
            // `owner` will be be checked if it equals the hash at 0x00,
            // which evaluates to false (i.e. 0), and we will revert.
            // If the ecrecover succeeds, the returndatasize will be 0x20,
            // `owner` will be compared against the returned address at 0x20.
            if iszero(eq(mload(returndatasize()), owner)) {
                mstore(0x00, 0xddafbaef) // `InvalidPermit()`.
                revert(0x1c, 0x04)
            }
            // Compute the allowance slot and store the value.
            // The `owner` is already at slot 0x20.
            mstore(0x40, or(shl(160, _ALLOWANCE_SLOT_SEED), spender))
            sstore(keccak256(0x2c, 0x34), value)
            // Emit the {Approval} event.
            log3(add(m, 0x60), 0x20, _APPROVAL_EVENT_SIGNATURE, owner, spender)
            mstore(0x40, m) // Restore the free memory pointer.
            mstore(0x60, 0) // Restore the zero pointer.
        }
    }

    /// @dev Returns the EIP-2612 domains separator.
    function DOMAIN_SEPARATOR() public view virtual returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := mload(0x40) // Grab the free memory pointer.
        }
        //  We simply calculate it on-the-fly to allow for cases where the `name` may change.
        bytes32 nameHash = keccak256(bytes(name()));
        /// @solidity memory-safe-assembly
        assembly {
            let m := result
            // `keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")`.
            // forgefmt: disable-next-item
            mstore(m, 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f)
            mstore(add(m, 0x20), nameHash)
            // `keccak256("1")`.
            // forgefmt: disable-next-item
            mstore(add(m, 0x40), 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6)
            mstore(add(m, 0x60), chainid())
            mstore(add(m, 0x80), address())
            result := keccak256(m, 0xa0)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  INTERNAL MINT FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Mints `amount` tokens to `to`, increasing the total supply.
    ///
    /// Emits a {Transfer} event.
    function _mint(address to, uint256 amount) internal virtual {
        _beforeTokenTransfer(address(0), to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            let totalSupplyBefore := sload(_TOTAL_SUPPLY_SLOT)
            let totalSupplyAfter := add(totalSupplyBefore, amount)
            // Revert if the total supply overflows.
            if lt(totalSupplyAfter, totalSupplyBefore) {
                mstore(0x00, 0xe5cfe957) // `TotalSupplyOverflow()`.
                revert(0x1c, 0x04)
            }
            // Store the updated total supply.
            sstore(_TOTAL_SUPPLY_SLOT, totalSupplyAfter)
            // Compute the balance slot and load its value.
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, 0, shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(address(0), to, amount);
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  INTERNAL BURN FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Burns `amount` tokens from `from`, reducing the total supply.
    ///
    /// Emits a {Transfer} event.
    function _burn(address from, uint256 amount) internal virtual {
        _beforeTokenTransfer(from, address(0), amount);
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the balance slot and load its value.
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, from)
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Subtract and store the updated total supply.
            sstore(_TOTAL_SUPPLY_SLOT, sub(sload(_TOTAL_SUPPLY_SLOT), amount))
            // Emit the {Transfer} event.
            mstore(0x00, amount)
            log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, shl(96, from)), 0)
        }
        _afterTokenTransfer(from, address(0), amount);
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                INTERNAL TRANSFER FUNCTIONS                 */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Moves `amount` of tokens from `from` to `to`.
    function _transfer(address from, address to, uint256 amount) internal virtual {
        _beforeTokenTransfer(from, to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            let from_ := shl(96, from)
            // Compute the balance slot and load its value.
            mstore(0x0c, or(from_, _BALANCE_SLOT_SEED))
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Compute the balance slot of `to`.
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance of `to`.
            // Will not overflow because the sum of all user balances
            // cannot exceed the maximum uint256 value.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, from_), shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(from, to, amount);
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                INTERNAL ALLOWANCE FUNCTIONS                */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Updates the allowance of `owner` for `spender` based on spent `amount`.
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the allowance slot and load its value.
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, owner)
            let allowanceSlot := keccak256(0x0c, 0x34)
            let allowance_ := sload(allowanceSlot)
            // If the allowance is not the maximum uint256 value.
            if iszero(eq(allowance_, not(0))) {
                // Revert if the amount to be transferred exceeds the allowance.
                if gt(amount, allowance_) {
                    mstore(0x00, 0x13be252b) // `InsufficientAllowance()`.
                    revert(0x1c, 0x04)
                }
                // Subtract and store the updated allowance.
                sstore(allowanceSlot, sub(allowance_, amount))
            }
        }
    }

    /// @dev Sets `amount` as the allowance of `spender` over the tokens of `owner`.
    ///
    /// Emits a {Approval} event.
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            let owner_ := shl(96, owner)
            // Compute the allowance slot and store the amount.
            mstore(0x20, spender)
            mstore(0x0c, or(owner_, _ALLOWANCE_SLOT_SEED))
            sstore(keccak256(0x0c, 0x34), amount)
            // Emit the {Approval} event.
            mstore(0x00, amount)
            log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, shr(96, owner_), shr(96, mload(0x2c)))
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     HOOKS TO OVERRIDE                      */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Hook that is called before any transfer of tokens.
    /// This includes minting and burning.
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /// @dev Hook that is called after any transfer of tokens.
    /// This includes minting and burning.
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// File: lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);
}

// File: src/IUniswapV2Factory.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

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

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint256) external view returns (address pair);
    function allPairsLength() external view returns (uint256);

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

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

// File: src/IUniswapV2Router01.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2;

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

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);
    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapExactETHForTokens(uint256 amountOutMin, address[] calldata path, address to, uint256 deadline)
        external
        payable
        returns (uint256[] memory amounts);
    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapETHForExactTokens(uint256 amountOut, address[] calldata path, address to, uint256 deadline)
        external
        payable
        returns (uint256[] memory amounts);

    function quote(uint256 amountA, uint256 reserveA, uint256 reserveB) external pure returns (uint256 amountB);
    function getAmountOut(uint256 amountIn, uint256 reserveIn, uint256 reserveOut)
        external
        pure
        returns (uint256 amountOut);
    function getAmountIn(uint256 amountOut, uint256 reserveIn, uint256 reserveOut)
        external
        pure
        returns (uint256 amountIn);
    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}