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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/access/Ownable2Step.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() external {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: contracts/gauges/TransmitEmissionsGauge.sol



// SPDX-License-Identifier: LGPL-3.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/access/Ownable2Step.sol";
import {TransferHelper} from "light-lib/contracts/TransferHelper.sol";

interface ILT {
    function rate() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    /**
     * @notice Update mining rate and supply at the start of the epoch
     * @dev   Callable by any address, but only once per epoch
     *        Total supply becomes slightly larger if this function is called late
     */
    function updateMiningParameters() external;

    /**
     * @notice Get timestamp of the next mining epoch start while simultaneously updating mining parameters
     * @return Timestamp of the next epoch
     */
    function futureEpochTimeWrite() external returns (uint256);
}

interface IGaugeController {
    /**
     * @notice Checkpoint to fill data for both a specific gauge and common for all gauge
     * @param addr Gauge address
     */
    function checkpointGauge(address addr) external;

    /**
     * @notice Get Gauge relative weight (not more than 1.0) normalized to 1e18(e.g. 1.0 == 1e18). Inflation which will be received by
     * it is inflation_rate * relative_weight / 1e18
     * @param gaugeAddress Gauge address
     * @param time Relative weight at the specified timestamp in the past or present
     * @return Value of relative weight normalized to 1e18
     */
    function gaugeRelativeWeight(address gaugeAddress, uint256 time) external view returns (uint256);
}

interface IMinter {
    function mint(address gaugeAddress) external;
}

contract TransmitEmissionsGauge is Ownable2Step {
    event UpdateReceiver(address oldReceiver, address newReceiver);
    event UpdateStatus(bool isKilled, uint timestamp);

    struct InflationParams {
        uint256 rate;
        uint256 finishTime;
    }

    uint256 private constant WEEK = 604800;
    uint256 private constant YEAR = 86400 * 365;
    uint256 private constant RATE_DENOMINATOR = 10 ** 18;
    uint256 private constant RATE_REDUCTION_COEFFICIENT = 1189207115002721024; // 2 ** (1/4) * 1e18
    uint256 private constant RATE_REDUCTION_TIME = YEAR;

    address public immutable ltToken;
    address public immutable minter;
    address public immutable gaugeController;
    address public receiver; // receive the lt token

    uint256 public lastPeriod;
    uint256 public totalEmissions;

    bool public isKilled;

    InflationParams public inflationParams;

    constructor(address _ltToken, address _gaugeController, address _minter, address _receiver) {
        require(_ltToken != address(0), "CANNOT BE ZERO ADDRESS");
        require(_gaugeController != address(0), "CANNOT BE ZERO ADDRESS");
        require(_minter != address(0), "CANNOT BE ZERO ADDRESS");
        require(_receiver != address(0), "CANNOT BE ZERO ADDRESS");
        ltToken = _ltToken;
        gaugeController = _gaugeController;
        minter = _minter;
        receiver = _receiver;

        inflationParams = InflationParams({rate: ILT(_ltToken).rate(), finishTime: ILT(_ltToken).futureEpochTimeWrite()});
        assert(inflationParams.rate != 0);

        lastPeriod = block.timestamp / WEEK;

        emit UpdateReceiver(address(0), _receiver);
    }

    /***
     * @notice Mint any new emissions and transmit to receiver, can be called by anyone
     */
    function transmitEmissions() external {
        IMinter(minter).mint(address(this));
        uint256 minted = ILT(ltToken).balanceOf(address(this));
        assert(minted != 0);
        TransferHelper.doTransferOut(ltToken, receiver, minted);
    }

    /***
     * @notice Query the total emissions `_user` is entitled to
     * @dev Any value of `_user` other than the gauge address will return 0
     */
    function integrateFraction(address _user) external view returns (uint256) {
        if (_user == address(this)) return totalEmissions;
        return 0;
    }

    /***
     * @notice Checkpoint the gauge updating total emissions
     * @dev _user Vestigial parameter with no impact on the function
     */
    function userCheckpoint(address _user) external returns (bool) {
        uint256 _lastPeriod = lastPeriod;
        uint256 currentPeriod = block.timestamp / WEEK;

        //only checkpoint if the current period is greater than the last period
        //last period is always less than or equal to current period and we only calculate
        //emissions up to current period (not including it)
        if (_lastPeriod != currentPeriod) {
            //checkpoint the gauge filling in any missing weight data
            IGaugeController(gaugeController).checkpointGauge(address(this));

            InflationParams memory _inflationParams = inflationParams;
            uint256 emissions = 0;
            //only calculate emissions for at most 256 periods since the last checkpoint
            for (uint256 i = _lastPeriod; i < _lastPeriod + 256; i++) {
                if (i == currentPeriod) break;
                uint256 periodTime = i * WEEK;
                uint256 weight = IGaugeController(gaugeController).gaugeRelativeWeight(address(this), periodTime);
                if (periodTime <= _inflationParams.finishTime && _inflationParams.finishTime < periodTime + WEEK) {
                    //calculate with old rate
                    emissions += (weight * _inflationParams.rate * (_inflationParams.finishTime - periodTime)) / 10 ** 18;
                    //update rate
                    _inflationParams.rate = (_inflationParams.rate * RATE_DENOMINATOR) / RATE_REDUCTION_COEFFICIENT;
                    //calculate with new rate
                    emissions += (weight * _inflationParams.rate * (periodTime + WEEK - _inflationParams.finishTime)) / 10 ** 18;
                    //update finish time
                    _inflationParams.finishTime += RATE_REDUCTION_TIME;
                    //update storage
                    inflationParams = _inflationParams;
                } else {
                    emissions += (weight * _inflationParams.rate * WEEK) / 10 ** 18;
                }
            }

            lastPeriod = currentPeriod;
            totalEmissions += emissions;
        }

        return true;
    }

    /***
     * @notice Set the killed status for this contract
     * @dev When killed, the gauge always yields a rate of 0 and so cannot mint LT
     * @param _is_killed Killed status to set
     */
    function setKilled(bool _isKilled) external onlyOwner {
        if (_isKilled) {
            inflationParams.rate = 0;
        } else {
            inflationParams.rate = ILT(ltToken).rate();
            inflationParams.finishTime = ILT(ltToken).futureEpochTimeWrite();
            lastPeriod = block.timestamp / WEEK;
        }

        isKilled = _isKilled;

        emit UpdateStatus(_isKilled, block.timestamp);
    }

    /***
     * @notice update the receiver
     * @param newReceiver the new receiver
     */
    function updateReceiver(address newReceiver) external onlyOwner {
        require(newReceiver != address(0), "CANNOT BE ZERO ADDRESS");
        require(newReceiver != receiver, "THE SAME RECEIVER");
        receiver = newReceiver;
        emit UpdateReceiver(receiver, newReceiver);
    }
}

// File: light-lib/contracts/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity 0.8.17;

/**
 * @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: light-lib/contracts/IPermit2.sol



// SPDX-License-Identifier: LGPL-3.0

pragma solidity 0.8.17;

interface IPermit2 {
    /// @notice The token and amount details for a transfer signed in the permit transfer signature
    struct TokenPermissions {
        // ERC20 token address
        address token;
        // the maximum amount that can be spent
        uint256 amount;
    }

    /// @notice The signed permit message for a single token transfer
    struct PermitTransferFrom {
        TokenPermissions permitted;
        // a unique value for every token owner's signature to prevent signature replays
        uint256 nonce;
        // deadline on the permit signature
        uint256 deadline;
    }

    /// @notice Specifies the recipient address and amount for batched transfers.
    /// @dev Recipients and amounts correspond to the index of the signed token permissions array.
    /// @dev Reverts if the requested amount is greater than the permitted signed amount.
    struct SignatureTransferDetails {
        // recipient address
        address to;
        // spender requested amount
        uint256 requestedAmount;
    }

    /// @notice Used to reconstruct the signed permit message for multiple token transfers
    /// @dev Do not need to pass in spender address as it is required that it is msg.sender
    /// @dev Note that a user still signs over a spender address
    struct PermitBatchTransferFrom {
        // the tokens and corresponding amounts permitted for a transfer
        TokenPermissions[] permitted;
        // a unique value for every token owner's signature to prevent signature replays
        uint256 nonce;
        // deadline on the permit signature
        uint256 deadline;
    }

    /// @notice Details for a token transfer.
    struct AllowanceTransferDetails {
        // the owner of the token
        address from;
        // the recipient of the token
        address to;
        // the amount of the token
        uint160 amount;
        // the token to be transferred
        address token;
    }

    /// @notice A map from token owner address and a caller specified word index to a bitmap. Used to set bits in the bitmap to prevent against signature replay protection
    /// @dev Uses unordered nonces so that permit messages do not need to be spent in a certain order
    /// @dev The mapping is indexed first by the token owner, then by an index specified in the nonce
    /// @dev It returns a uint256 bitmap
    /// @dev The index, or wordPosition is capped at type(uint248).max
    function nonceBitmap(address, uint256) external view returns (uint256);

    /// @notice Transfers a token using a signed permit message
    /// @dev Reverts if the requested amount is greater than the permitted signed amount
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails The spender's requested transfer details for the permitted token
    /// @param signature The signature to verify
    function permitTransferFrom(
        PermitTransferFrom memory permit,
        SignatureTransferDetails calldata transferDetails,
        address owner,
        bytes calldata signature
    ) external;

    /// @notice Transfers a token using a signed permit message
    /// @notice Includes extra data provided by the caller to verify signature over
    /// @dev The witness type string must follow EIP712 ordering of nested structs and must include the TokenPermissions type definition
    /// @dev Reverts if the requested amount is greater than the permitted signed amount
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails The spender's requested transfer details for the permitted token
    /// @param witness Extra data to include when checking the user signature
    /// @param witnessTypeString The EIP-712 type definition for remaining string stub of the typehash
    /// @param signature The signature to verify
    function permitWitnessTransferFrom(
        PermitTransferFrom memory permit,
        SignatureTransferDetails calldata transferDetails,
        address owner,
        bytes32 witness,
        string calldata witnessTypeString,
        bytes calldata signature
    ) external;

    /// @notice Transfers multiple tokens using a signed permit message
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails Specifies the recipient and requested amount for the token transfer
    /// @param signature The signature to verify
    function permitTransferFrom(
        PermitBatchTransferFrom memory permit,
        SignatureTransferDetails[] calldata transferDetails,
        address owner,
        bytes calldata signature
    ) external;

    /// @notice Transfers multiple tokens using a signed permit message
    /// @dev The witness type string must follow EIP712 ordering of nested structs and must include the TokenPermissions type definition
    /// @notice Includes extra data provided by the caller to verify signature over
    /// @param permit The permit data signed over by the owner
    /// @param owner The owner of the tokens to transfer
    /// @param transferDetails Specifies the recipient and requested amount for the token transfer
    /// @param witness Extra data to include when checking the user signature
    /// @param witnessTypeString The EIP-712 type definition for remaining string stub of the typehash
    /// @param signature The signature to verify
    function permitWitnessTransferFrom(
        PermitBatchTransferFrom memory permit,
        SignatureTransferDetails[] calldata transferDetails,
        address owner,
        bytes32 witness,
        string calldata witnessTypeString,
        bytes calldata signature
    ) external;

    /// @notice Invalidates the bits specified in mask for the bitmap at the word position
    /// @dev The wordPos is maxed at type(uint248).max
    /// @param wordPos A number to index the nonceBitmap at
    /// @param mask A bitmap masked against msg.sender's current bitmap at the word position
    function invalidateUnorderedNonces(uint256 wordPos, uint256 mask) external;

    /// @notice Transfer approved tokens from one address to another
    /// @param from The address to transfer from
    /// @param to The address of the recipient
    /// @param amount The amount of the token to transfer
    /// @param token The token address to transfer
    /// @dev Requires the from address to have approved at least the desired amount
    /// of tokens to msg.sender.
    function transferFrom(address from, address to, uint160 amount, address token) external;

    /// @notice Transfer approved tokens in a batch
    /// @param transferDetails Array of owners, recipients, amounts, and tokens for the transfers
    /// @dev Requires the from addresses to have approved at least the desired amount
    /// of tokens to msg.sender.
    function transferFrom(AllowanceTransferDetails[] calldata transferDetails) external;
}

// File: light-lib/contracts/TransferHelper.sol



// SPDX-License-Identifier: LGPL-3.0

pragma solidity 0.8.17;

import "./IERC20.sol";
import "./IPermit2.sol";

library TransferHelper {
    
    /**
     * @dev Similar to EIP20 transfer, except it handles a False result from `transferFrom` and reverts in that case.
     *      This will revert due to insufficient balance or insufficient allowance.
     *      This function returns the actual amount received,
     *      which may be less than `amount` if there is a fee attached to the transfer.
     *
     *      Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
     */
    function doTransferFrom(address tokenAddress, address from, address to, uint256 amount) internal returns(uint256) {
        IERC20 token = IERC20(tokenAddress);
        uint256 balanceBefore = token.balanceOf(to);
        safeTransferFrom(token, from, to, amount);
        uint256 balanceAfter = token.balanceOf(to);
        uint256 actualAmount = balanceAfter - balanceBefore;
        assert(actualAmount <= amount);
        return actualAmount;
    }

    /**
     * @dev transfer with permit2
     */
    function doTransferIn(
        address permit2Address,
        address tokenAddress,
        uint256 _value,
        address from,
        uint256 nonce,
        uint256 deadline,
        bytes memory signature
    ) internal returns (uint256) {
        IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
            permitted: IPermit2.TokenPermissions({token: tokenAddress, amount: _value}),
            nonce: nonce,
            deadline: deadline
        });
        IPermit2.SignatureTransferDetails memory transferDetails = IPermit2.SignatureTransferDetails({
            to: address(this),
            requestedAmount: _value
        });
        // Read from storage once
        IERC20 token = IERC20(permit.permitted.token);
        uint256 balanceBefore = token.balanceOf(transferDetails.to);
        if (nonce == 0 && deadline == 0) {
            safeTransferFrom(token, from, transferDetails.to, transferDetails.requestedAmount);
        } else {
            IPermit2(permit2Address).permitTransferFrom(permit, transferDetails, from, signature);
        }
        // Calculate the amount that was *actually* transferred
        uint256 balanceAfter = IERC20(permit.permitted.token).balanceOf(address(this));
        uint256 actualAmount = balanceAfter - balanceBefore;
        assert(actualAmount <= transferDetails.requestedAmount);
        
        return actualAmount;
    }

    /**
     * @dev Permit2 allowance transfer
     */
    function doTransferFromWithPermit2Allowance(
        address permit2Address,
        address tokenAddress,
        address from,
        address to,
        uint256 amount
    ) internal returns (uint256) {
        // Read from storage once
        IERC20 token = IERC20(tokenAddress);
        uint256 balanceBefore = token.balanceOf(to);
        IPermit2(permit2Address).transferFrom(from, to, uint160(amount), tokenAddress);
        // Calculate the amount that was *actually* transferred
        uint256 balanceAfter = token.balanceOf(to);
        uint256 actualAmount = balanceAfter - balanceBefore;
        assert(actualAmount <= amount);
        
        return actualAmount;
    }

    /**
     * @dev Similar to EIP20 transfer, except it handles a False success from `transfer` and returns an explanatory
     *      error code rather than reverting. If caller has not called checked protocol's balance, this may revert due to
     *      insufficient cash held in this contract. If caller has checked protocol's balance prior to this call, and verified
     *      it is >= amount, this should not revert in normal conditions.
     *
     *      Note: This wrapper safely handles non-standard ERC-20 tokens that do not return a value.
     */
    function doTransferOut(address tokenAddress, address to, uint256 amount) internal returns(uint256) {
        IERC20 token = IERC20(tokenAddress);
        uint256 balanceBefore = token.balanceOf(to);
        safeTransfer(token, to, amount);
        uint256 balanceAfter = token.balanceOf(to);
        uint256 actualAmount = balanceAfter - balanceBefore;
        assert(actualAmount <= amount);
        return actualAmount;
    }

    function doApprove(address tokenAddress, address to, uint256 amount) internal {
        IERC20 token = IERC20(tokenAddress);
        safeApprove(token, to, amount);
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED11111");
    }

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        IERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}