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// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ReentrancyGuard} from "../../lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";
import {Multicall} from "../../lib/openzeppelin-contracts/contracts/utils/Multicall.sol";
import {SafeERC20} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import {IERC20} from "../../lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
import {IERC721} from "../../lib/openzeppelin-contracts/contracts/interfaces/IERC721.sol";
import {IERC721Receiver} from "../../lib/openzeppelin-contracts/contracts/token/ERC721/IERC721Receiver.sol";
import {IVault} from "../interfaces/IVault.sol";
import {IYieldStrippedToken} from "../interfaces/IYieldStrippedToken.sol";
import {BlastManager} from "../libraries/BlastManager.sol";
import {FixedRate} from "../FixedRate.sol";
import {VariableRate} from "../VariableRate.sol";
import {FixedRateNFT} from "./FixedRateNFT.sol";
import {VariableRateNFT} from "./VariableRateNFT.sol";
import {DuoAssetToken} from "./DuoAssetToken.sol";
import {CoreRef} from "../core/CoreRef.sol";

address constant WETH = 0x4300000000000000000000000000000000000004;

interface IWETH {
    function deposit() external payable;
    function withdraw(uint256) external;
}

contract WrapMintV2 is IERC721Receiver, ReentrancyGuard, Multicall, CoreRef, BlastManager {
    using SafeERC20 for IERC20;

    /* Immutables */
    // solhint-disable var-name-mixedcase
    address public TOKEN;
    address public VAULT;

    /* Variable */
    address public duoAssetToken;
    address public fixedRateNft;
    address public variableRateNft;

    /* Storage */
    mapping(address => bool) public whitelistedExchanges;
    mapping(address => address) public fixedRateContracts;
    mapping(address => address) public variableRateContracts;
    mapping(uint256 => address) public fixedRateNfts;
    mapping(uint256 => address) public variableRateNfts;

    /* Events */
    event MintFixedRate(address indexed fixedRate, address indexed owner, uint256 principal, uint256 yield);
    event BurnFixedRate(address indexed fixedRate, uint256 principal, uint256 yieldToUnlock, uint256 yieldToRelease);
    event MintVariableRate(address indexed variableRate, address indexed owner, uint256 amount);
    event BurnVariableRate(address indexed variableRate, uint256 amount, uint256 yield, uint256 fee);
    event UpdateExchange(address indexed exchange, bool status);
    event UpdateFixedRateNft(address indexed nft);
    event UpdateVariableRateNft(address indexed nft);
    event UpdateDuoAssetToken(address indexed duoAssetToken);

    constructor(address token, address vault, address core) CoreRef(core) {
        TOKEN = token;
        VAULT = vault;
    }

    /*==============================================================
                               Swap Logic
    ==============================================================*/

    /**
     * @notice swap the token using a whitelisted exchange
     * @param exchange the exchange to swap on
     * @param token the source token to swap
     * @param amountIn the amount of token to swap
     * @param amountOutMin the minimum amount of token to receive
     * @param data the swap data
     * @return amountOut the amount of token received
     */
    function _swap(
        address exchange,
        address token,
        uint256 amountIn,
        uint256 amountOutMin,
        bytes calldata data
    ) internal returns (uint256 amountOut) {
        require(whitelistedExchanges[exchange], "WrapMint: unauthorized exchange");

        // approve spending to exchange
        IERC20(token).approve(exchange, amountIn);

        // swap
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = exchange.call(data);
        require(success, "WrapMint: swap failed");

        // received amount slippage
        amountOut = IERC20(IYieldStrippedToken(TOKEN).token()).balanceOf(address(this));
        require(amountOut >= amountOutMin, "WrapMint: slippage");

        // approve spending back to zero
        IERC20(token).approve(exchange, 0);
    }

    /*==============================================================
                              Mint Fixed Rate
    ==============================================================*/

    /**
     * @notice mint a fixed rate contract (represented as NFT), input with ERC20 token
     */
    function mintFixedRate(
        address exchange,
        address token,
        uint256 amountIn,
        uint256 amountOutMin,
        uint256 minLockedYield,
        bytes calldata data
    ) external nonReentrant returns (address fixedRateContract, uint256 amountOut, uint256 lockedYield) {
        // transfer input amount
        IERC20(token).safeTransferFrom(msg.sender, address(this), amountIn);

        (fixedRateContract, amountOut, lockedYield) = _mintFixedRate(
            exchange,
            token,
            amountIn,
            amountOutMin,
            minLockedYield,
            data
        );

        // refund remaining
        uint256 remaining = IERC20(token).balanceOf(address(this));
        if (remaining > 0) {
            IERC20(token).safeTransfer(msg.sender, remaining);
        }
    }

    /**
     * @notice mint a fixed rate contract (represented as NFT), input with ETH
     */
    function mintFixedRateEth(
        address exchange,
        uint256 amountIn,
        uint256 amountOutMin,
        uint256 minLockedYield,
        bytes calldata data
    ) external payable nonReentrant returns (address fixedRateContract, uint256 amountOut, uint256 lockedYield) {
        // wrap to WETH
        require(msg.value == amountIn, "WrapMint: insufficient ETH");
        IWETH(WETH).deposit{value: amountIn}();

        (fixedRateContract, amountOut, lockedYield) = _mintFixedRate(
            exchange,
            WETH,
            amountIn,
            amountOutMin,
            minLockedYield,
            data
        );

        // refund remaining
        uint256 remaining = IERC20(WETH).balanceOf(address(this));
        if (remaining > 0) {
            IWETH(WETH).withdraw(remaining);
            payable(msg.sender).transfer(remaining);
        }
    }

    /**
     * @notice mint a fixed rate contract (represented as NFT)
     * @param exchange the exchange to swap on
     * @param token the source token to swap
     * @param amountIn the amount of token to swap
     * @param amountOutMin the minimum amount of token to receive
     * @param minLockedYield the minimum amount of yield to lock
     * @param data the swap data
     * @return fixedRateContract the address of the fixed rate contract
     * @return principal the amount of principal received
     * @return lockedYield the amount of yield locked
     */
    function _mintFixedRate(
        address exchange,
        address token,
        uint256 amountIn,
        uint256 amountOutMin,
        uint256 minLockedYield,
        bytes calldata data
    ) internal returns (address fixedRateContract, uint256 principal, uint256 lockedYield) {
        // swap if needed
        address underlyingToken = IYieldStrippedToken(TOKEN).token();
        uint256 amountOut = amountIn; // if token is already underlying, no swap needed
        if (token != underlyingToken) {
            amountOut = _swap(exchange, token, amountIn, amountOutMin, data);
        }

        // approve the underlying spending to yield stripped token
        IERC20(underlyingToken).approve(TOKEN, amountOut);

        // wrap
        ///@dev if token is already wrapped TOKEN, call FixedRateNFT.mint directly
        IYieldStrippedToken(TOKEN).wrap(amountOut);

        // approve the underlying spending back to zero
        IERC20(underlyingToken).approve(TOKEN, 0);

        // approve wrapped token spending to vault
        IERC20(TOKEN).approve(VAULT, amountOut);

        // mint fixed rate contract
        (fixedRateContract, lockedYield, ) = IVault(VAULT).mintFixedRate(amountOut, minLockedYield, address(this));

        // actual principal amount after fees
        principal = FixedRate(fixedRateContract).principal();

        // approve wrapped token spending back to zero
        IERC20(TOKEN).approve(VAULT, 0);

        // mark the ownership of fixed rate contract
        fixedRateContracts[fixedRateContract] = msg.sender;

        // mint asset token to sender
        DuoAssetToken(duoAssetToken).mint(msg.sender, principal + lockedYield);

        emit MintFixedRate(fixedRateContract, msg.sender, principal, lockedYield);
    }

    /*==============================================================
                              Burn Fixed Rate
    ==============================================================*/

    /**
     * @notice burn a fixed rate contract, together with asset token, receiving principal and yield
     * @param fixedRate the fixed rate contract to burn
     * @param amount the amount of fixed rate contract to burn
     * @return yieldToUnlock the amount of yield to unlock
     * @return yieldToRelease the amount of yield to release
     */
    function burnFixedRate(
        address fixedRate,
        uint256 amount
    ) external nonReentrant returns (uint256 yieldToUnlock, uint256 yieldToRelease) {
        // caller must be owner
        require(fixedRateContracts[fixedRate] == msg.sender, "WrapMint: unauthorized");

        // use fixed rate contract to burn
        (yieldToUnlock, yieldToRelease) = FixedRate(fixedRate).burn(amount);

        // transfer the underlying to sender
        IYieldStrippedToken(TOKEN).unwrapTo(amount + yieldToRelease, msg.sender);

        // must burn the same amount of asset token
        DuoAssetToken(duoAssetToken).burnFrom(msg.sender, amount + yieldToUnlock);

        emit BurnFixedRate(fixedRate, amount, yieldToUnlock, yieldToRelease);
    }

    /*==============================================================
                           Withdraw Fixed Rate
    ==============================================================*/

    /**
     * @notice withdraw the principal of fixed rate contract, at emergency, bypassing vault
     * @param fixedRate the fixed rate contract to withdraw
     * @param amount the amount of principal to withdraw
     */
    function withdrawFixedRate(address fixedRate, uint256 amount) external nonReentrant {
        // caller must be owner
        require(fixedRateContracts[fixedRate] == msg.sender, "WrapMint: unauthorized");

        // use fixed rate contract to withdraw
        FixedRate(fixedRate).withdraw(amount);

        // transfer the underlying to sender
        IYieldStrippedToken(TOKEN).unwrapTo(amount, msg.sender);

        // must burn the same amount of asset token
        DuoAssetToken(duoAssetToken).burnFrom(msg.sender, amount);
    }

    /*==============================================================
                           Mint Variable Rate
    ==============================================================*/

    /**
     * @notice mint a variable rate contract, input with ERC20 token
     */
    function mintVariableRate(
        address exchange,
        address token,
        uint256 amountIn,
        uint256 amountOutMin,
        bytes calldata data
    ) external nonReentrant returns (address variableRateContract, uint256 amountOut) {
        // transfer input amount
        IERC20(token).safeTransferFrom(msg.sender, address(this), amountIn);

        (variableRateContract, amountOut) = _mintVariableRate(exchange, token, amountIn, amountOutMin, data);

        // refund remaining
        uint256 remaining = IERC20(token).balanceOf(address(this));
        if (remaining > 0) {
            IERC20(token).safeTransfer(msg.sender, remaining);
        }
    }

    /**
     * @notice mint a variable rate contract, input with ETH
     */
    function mintVariableRateEth(
        address exchange,
        uint256 amountIn,
        uint256 amountOutMin,
        bytes calldata data
    ) external payable nonReentrant returns (address variableRateContract, uint256 amountOut) {
        // wrap to WETH
        require(msg.value == amountIn, "WrapMint: insufficient ETH");
        IWETH(WETH).deposit{value: amountIn}();

        (variableRateContract, amountOut) = _mintVariableRate(exchange, WETH, amountIn, amountOutMin, data);

        // refund remaining
        uint256 remaining = IERC20(WETH).balanceOf(address(this));
        if (remaining > 0) {
            IWETH(WETH).withdraw(remaining);
            payable(msg.sender).transfer(remaining);
        }
    }

    /**
     * @notice mint a variable rate contract
     * @param exchange the exchange to swap on
     * @param token the source token to swap
     * @param amountIn the amount of token to swap
     * @param amountOutMin the minimum amount of token to receive
     * @param data the swap data
     * @return variableRateContract the address of the variable rate contract
     * @return amountOut the amount of token received
     */
    function _mintVariableRate(
        address exchange,
        address token,
        uint256 amountIn,
        uint256 amountOutMin,
        bytes calldata data
    ) internal returns (address variableRateContract, uint256 amountOut) {
        // swap if needed
        address underlyingToken = IYieldStrippedToken(TOKEN).token();
        amountOut = amountIn; // if token is already underlying, no swap needed
        if (token != underlyingToken) {
            amountOut = _swap(exchange, token, amountIn, amountOutMin, data);
        }

        // approve the underlying spending to yield stripped token
        IERC20(underlyingToken).approve(TOKEN, amountOut);

        // wrap
        ///@dev if token is already wrapped TOKEN, call VAULT.mintVariableRate directly
        IYieldStrippedToken(TOKEN).wrap(amountOut);

        // approve the underlying spending back to zero
        IERC20(underlyingToken).approve(TOKEN, 0);

        // approve spending to vault
        IERC20(TOKEN).approve(VAULT, amountOut);

        // mint variable rate contract
        variableRateContract = IVault(VAULT).mintVariableRate(amountOut, address(this));

        // approve spending back to zero
        IERC20(TOKEN).approve(VAULT, 0);

        // mark the ownership of variable rate contract
        variableRateContracts[variableRateContract] = msg.sender;

        // mint asset token to sender
        DuoAssetToken(duoAssetToken).mint(msg.sender, amountOut);

        emit MintVariableRate(variableRateContract, msg.sender, amountOut);
    }

    /*==============================================================
                           Burn Variable Rate
    ==============================================================*/

    /**
     * @notice burn a variable rate contract, together with asset token, receiving principal and yield
     * @param variableRate the variable rate contract to burn
     * @param amount the amount of variable rate contract to burn
     * @param minYield the minimum amount of yield to unlock
     * @return yield the amount of yield unlocked
     * @return fee the amount of fee
     */
    function burnVariableRate(
        address variableRate,
        uint256 amount,
        uint256 minYield
    ) external nonReentrant returns (uint256 yield, uint256 fee) {
        // caller must be owner
        require(variableRateContracts[variableRate] == msg.sender, "WrapMint: unauthorized");

        // use variable rate contract to burn
        (yield, fee) = VariableRate(variableRate).burn(amount, minYield);

        // transfer the underlying to sender
        IYieldStrippedToken(TOKEN).unwrapTo(amount + yield + fee, msg.sender);

        // must burn the principal amount of asset token
        DuoAssetToken(duoAssetToken).burnFrom(msg.sender, amount);

        emit BurnVariableRate(variableRate, amount, yield, fee);
    }

    /*==============================================================
                           Withdraw Variable Rate
    ==============================================================*/

    /**
     * @notice withdraw the principal of variable rate contract, at emergency, bypassing vault
     * @param variableRate the variable rate contract to withdraw
     * @param amount the amount of principal to withdraw
     */
    function withdrawVariableRate(address variableRate, uint256 amount) external nonReentrant {
        // caller must be owner
        require(variableRateContracts[variableRate] == msg.sender, "WrapMint: unauthorized");

        // use variable rate contract to withdraw
        VariableRate(variableRate).withdraw(amount);

        // transfer the underlying to sender
        IYieldStrippedToken(TOKEN).unwrapTo(amount, msg.sender);

        // must burn the principal amount of asset token
        DuoAssetToken(duoAssetToken).burnFrom(msg.sender, amount);
    }

    /*==============================================================
                     Transfer In V1 Fixed Rate NFT
    ==============================================================*/

    /**
     * @notice transfer in a fixed rate NFT, receiving principal and yield as asset token
     * @param tokenId the id of the fixed rate NFT
     * @return principal the principal amount of asset token
     * @return yield the yield amount of asset token
     */
    function transferInFixedRateNft(uint256 tokenId) external nonReentrant returns (uint256 principal, uint256 yield) {
        // transfer the NFT to this contract
        IERC721(fixedRateNft).safeTransferFrom(msg.sender, address(this), tokenId);

        // mark the ownership of fixed rate NFT
        fixedRateNfts[tokenId] = msg.sender;

        // read principal and yield from NFT
        principal = FixedRate(FixedRateNFT(fixedRateNft).fixedRateContracts(tokenId)).principal();
        yield = FixedRate(FixedRateNFT(fixedRateNft).fixedRateContracts(tokenId)).yield();

        // mint asset token to sender
        DuoAssetToken(duoAssetToken).mint(msg.sender, principal + yield);
    }

    /*==============================================================
                     Transfer Out V1 Fixed Rate NFT
    ==============================================================*/

    /**
     * @notice transfer out a fixed rate NFT, burning principal and yield as asset token
     * @param tokenId the id of the fixed rate NFT
     * @return principal the principal amount of asset token
     * @return yield the yield amount of asset token
     */
    function transferOutFixedRateNft(uint256 tokenId) external nonReentrant returns (uint256 principal, uint256 yield) {
        // caller must be owner
        require(fixedRateNfts[tokenId] == msg.sender, "WrapMint: unauthorized");

        // read principal and yield from NFT
        principal = FixedRate(FixedRateNFT(fixedRateNft).fixedRateContracts(tokenId)).principal();
        yield = FixedRate(FixedRateNFT(fixedRateNft).fixedRateContracts(tokenId)).yield();

        // burn the principal and yield of asset token
        DuoAssetToken(duoAssetToken).burnFrom(msg.sender, principal + yield);

        // transfer the NFT to sender
        IERC721(fixedRateNft).safeTransferFrom(address(this), msg.sender, tokenId);

        // clear the ownership of fixed rate NFT
        fixedRateNfts[tokenId] = address(0);
    }

    /*==============================================================
                    Transfer In V1 Variable Rate NFT
    ==============================================================*/

    /**
     * @notice transfer in a variable rate NFT, receiving amount as asset token
     * @param tokenId the id of the variable rate NFT
     * @return principal the principal amount of asset token
     */
    function transferInVariableRateNft(uint256 tokenId) external nonReentrant returns (uint256 principal) {
        // transfer the NFT to this contract
        IERC721(variableRateNft).safeTransferFrom(msg.sender, address(this), tokenId);

        // mark the ownership of variable rate NFT
        variableRateNfts[tokenId] = msg.sender;

        // read principal amount from NFT
        principal = VariableRate(VariableRateNFT(variableRateNft).variableRateContracts(tokenId)).principal();

        // mint asset token to sender
        DuoAssetToken(duoAssetToken).mint(msg.sender, principal);
    }

    /*==============================================================
                    Transfer Out V1 Variable Rate NFT
    ==============================================================*/

    /**
     * @notice transfer out a variable rate NFT, burning amount as asset token
     * @param tokenId the id of the variable rate NFT
     * @return principal the amount of asset token
     */
    function transferOutVariableRateNft(uint256 tokenId) external nonReentrant returns (uint256 principal) {
        // caller must be owner
        require(variableRateNfts[tokenId] == msg.sender, "WrapMint: unauthorized");

        // read principal amount from NFT
        principal = VariableRate(VariableRateNFT(variableRateNft).variableRateContracts(tokenId)).principal();

        // burn the amount of asset token
        DuoAssetToken(duoAssetToken).burnFrom(msg.sender, principal);

        // transfer the NFT to sender
        IERC721(variableRateNft).safeTransferFrom(address(this), msg.sender, tokenId);

        // clear the ownership of variable rate NFT
        variableRateNfts[tokenId] = address(0);
    }

    /*==============================================================
                             Admin Control
    ==============================================================*/

    function addExchange(address exchange) external onlyGovernor {
        whitelistedExchanges[exchange] = true;
        emit UpdateExchange(exchange, true);
    }

    function removeExchange(address exchange) external onlyGovernor {
        whitelistedExchanges[exchange] = false;
        emit UpdateExchange(exchange, false);
    }

    function setFixedRateNft(address nft) external onlyGovernor {
        fixedRateNft = nft;
        emit UpdateFixedRateNft(nft);
    }

    function setVariableRateNft(address nft) external onlyGovernor {
        variableRateNft = nft;
        emit UpdateVariableRateNft(nft);
    }

    function setDuoAssetToken(address token) external onlyGovernor {
        duoAssetToken = token;
        emit UpdateDuoAssetToken(token);
    }

    /*==============================================================
                             Token Receiver
    ==============================================================*/

    function onERC721Received(address, address, uint256, bytes calldata) external pure override returns (bytes4) {
        return this.onERC721Received.selector;
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Multicall.sol)

pragma solidity ^0.8.0;

import "./Address.sol";

/**
 * @dev Provides a function to batch together multiple calls in a single external call.
 *
 * _Available since v4.1._
 */
abstract contract Multicall {
    /**
     * @dev Receives and executes a batch of function calls on this contract.
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function multicall(bytes[] calldata data) external virtual returns (bytes[] memory results) {
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; i++) {
            results[i] = Address.functionDelegateCall(address(this), data[i]);
        }
        return results;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC721.sol)

pragma solidity ^0.8.0;

import "../token/ERC721/IERC721.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

interface IVault {
    /*==============================================================
                               Event Logs
    ==============================================================*/

    event MintFixedRate(address indexed owner, uint256 id, uint256 mintAmount, uint256 lockedAmount);
    event BurnFixedRate(address indexed owner, uint256 id, uint256 burnAmount, uint256 yield);
    event MintVariableRate(address indexed owner, uint256 mintAmount);
    event BurnVariableRate(address indexed owner, uint256 burnAmount, uint256 yield, uint256 positionFee);
    event EstimateYield(uint256 currentRate, bool updated);
    event UpdateYieldManager(address indexed newYieldManager);
    event UpdateYieldEstimateWindow(uint256 window);
    event UpdateCurve(uint256 s1, uint256 s2, uint256 s3, uint256 r1, uint256 r2);
    event UpdatePositionFeeRate(uint256 fee);

    /*==============================================================
                         Fixed rate LP deposit
    ==============================================================*/

    /**
     * @notice Deposit a principal amount to lock a fixed yield rate until maturity
     * @param amount the deposit amount
     * @param minLockedYield the minimum amount to lock, for slippage protection
     * @param recipient the address to receive the fixedRate contract
     * @return owner the address to the fixedRate contract
     * @return lockedYield the amount locked, which over time releases the yield at fixed rate
     * @return maturityTimestamp the maturity timestamp
     */
    function mintFixedRate(
        uint256 amount,
        uint256 minLockedYield,
        address recipient
    ) external returns (address owner, uint256 lockedYield, uint256 maturityTimestamp);

    /*==============================================================
                        Fixed rate LP withdraw
    ==============================================================*/

    /**
     * @notice Withdraw a principal amount from a fixed yield rate deposit
     * @param id the deposit id
     * @param amount the amount of principal to withdraw
     * @return yieldToUnlock the yield to unlock from the locked amount
     * @return yieldToRelease the yield to release to the owner
     */
    function burnFixedRate(uint256 id, uint256 amount) external returns (uint256 yieldToUnlock, uint256 yieldToRelease);

    /*==============================================================
                       Variable rate LP deposit
    ==============================================================*/

    /**
     * @notice Deposit a principal amount for variable yield rate
     * @param amount the deposit amount
     * @param recipient the address to receive the variableRate contract
     * @return owner the address to the variableRate contract
     */
    function mintVariableRate(uint256 amount, address recipient) external returns (address owner);

    /*==============================================================
                      Variable rate LP withdraw
    ==============================================================*/

    /**
     * @notice Withdraw a principal amount from a variable yield rate deposit
     * @param amount the amount of principal to withdraw
     * @param minYield the minimum yield to receive, for slippage protection
     * @return yield the yield amount
     * @return fee the position fee
     */
    function burnVariableRate(uint256 amount, uint256 minYield) external returns (uint256 yield, uint256 fee);

    /*==============================================================
                            Helper Functions
    ==============================================================*/

    /**
     * @notice get the amount to lock based on the current fixed term rate and the deposit amount
     * @param amount the deposit amount
     * @return yieldToLock the amount to lock
     */
    function getYieldToLock(uint256 amount) external view returns (uint256 yieldToLock);

    /**
     * @notice get the maximum amount of principal for a fixed term rate
     * @return amount the maximum amount of principal
     */
    function getMaxFixedRateAmount() external view returns (uint256 amount);

    /**
     * @notice get the current fixed term rate from idle yield / total yield
     * @param amount the deposit amount
     * @return rate the current fixed term rate
     */
    function getFixedRate(uint256 amount) external view returns (uint256 rate);

    /**
     * @notice get the total yield from the protocol
     * @return totalYield the total yield
     */
    function getTotalYield() external view returns (uint256 totalYield);

    /**
     * @notice get the current yield and position fee accrued to a variable rate LP
     * @param owner the address of the LP
     * @return yield the current yield
     * @return fee the current position fee
     */
    function getCurrentVariableRate(address owner) external view returns (uint256 yield, uint256 fee);

    /*==============================================================
                              Admin Logic
    ==============================================================*/

    /**
     * @notice Update the yield manager
     * @param newYieldManager the new yield manager
     */
    function updateYieldManager(address newYieldManager) external;

    /**
     * @notice Update the fixed term rate curve
     * @param s1 the slope of chunk 1
     * @param s2 the slope of chunk 2
     * @param s3 the slope of chunk 3
     * @param r1 the ratio cutoff between chunk 1 and 2
     * @param r2 the ratio cutoff between chunk 2 and 3
     */
    function updateCurve(uint256 s1, uint256 s2, uint256 s3, uint256 r1, uint256 r2) external;

    /**
     * @notice Update the position fee
     * @param fee the new position fee
     */
    function updatePositionFeeRate(uint256 fee) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

interface IYieldStrippedToken {
    function token() external view returns (address);
    function totalSupply() external view returns (uint256);
    function wrap(uint256 amount) external returns (uint256);
    function unwrapTo(uint256 amount, address to) external returns (uint256);
    function mint(address account, uint256 amount) external;
    function burnFrom(address account, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {IBlast} from "../interfaces/IBlast.sol";
import {IBlastPoints} from "../interfaces/IBlastPoints.sol";

contract BlastManager {
    IBlast public constant BLAST = IBlast(0x4300000000000000000000000000000000000002);
    address public manager;

    modifier onlyManager() {
        require(msg.sender == manager, "Blast: not manager");
        _;
    }

    constructor() {
        manager = msg.sender;
        BLAST.configureClaimableGas();
    }

    function claimGas(address recipient, bool isMax) external onlyManager returns (uint256) {
        if (isMax) {
            return BLAST.claimMaxGas(address(this), recipient);
        } else {
            return BLAST.claimAllGas(address(this), recipient);
        }
    }

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

    function setGasMode(address blastGas) external onlyManager {
        IBlast(blastGas).configureClaimableGas();
    }

    function setPointsOperator(address blastPoints, address operator) external onlyManager {
        IBlastPoints(blastPoints).configurePointsOperator(operator);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ReentrancyGuard} from "../lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";
import {IERC20} from "../lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
import {SafeERC20} from "../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import {IVault} from "./interfaces/IVault.sol";
import {ICoreRef} from "./core/ICoreRef.sol";

contract FixedRate is ReentrancyGuard {
    using SafeERC20 for IERC20;

    /* Immutables */
    // solhint-disable var-name-mixedcase
    address public TOKEN;
    address public VAULT;
    address public OWNER;

    /* Variables */
    bool public initialized;
    uint256 public id;
    uint256 public principal;
    uint256 public yield;
    uint256 public maturityTimestamp;

    function initialize(address token, address vault, address owner) external nonReentrant {
        require(!initialized, "FixedRate: already initialized");
        initialized = true;
        TOKEN = token;
        VAULT = vault;
        OWNER = owner;
    }

    function mint(
        uint256 _id,
        uint256 _principal,
        uint256 _yield,
        uint256 _maturityTimestamp
    ) external nonReentrant onlyVault {
        require(IERC20(TOKEN).balanceOf(address(this)) == _principal + _yield, "FixedRate: insufficient fund");
        id = _id;
        principal = _principal;
        yield = _yield;
        maturityTimestamp = _maturityTimestamp;
    }

    function burn(
        uint256 amount
    ) external nonReentrant onlyOwner returns (uint256 yieldToUnlock, uint256 yieldToRelease) {
        require(amount <= principal, "FixedRate: overspend");
        (yieldToUnlock, yieldToRelease) = IVault(VAULT).burnFixedRate(id, amount);
        uint256 yieldBurned = yieldToUnlock - yieldToRelease;
        require(
            IERC20(TOKEN).balanceOf(address(this)) >= principal + yield - yieldBurned,
            "FixedRate: insufficient fund" // contract should now contain principal and remaining yield
        );
        principal -= amount;
        yield -= yieldToUnlock; // arithmetic check guarantees yieldToUnlock <= yield
        IERC20(TOKEN).safeTransfer(OWNER, amount + yieldToRelease);
    }

    function withdraw(uint256 amount) external nonReentrant onlyOwner onlyEmergency {
        require(amount <= principal, "FixedRate: overspend");
        principal -= amount;
        IERC20(TOKEN).safeTransfer(OWNER, amount);
    }

    modifier onlyOwner() {
        require(msg.sender == OWNER, "FixedRate: not owner");
        _;
    }

    modifier onlyVault() {
        require(msg.sender == VAULT, "FixedRate: not vault");
        _;
    }

    modifier onlyEmergency() {
        require(ICoreRef(VAULT).emergency(), "FixedRate: not emergency");
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ReentrancyGuard} from "../lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";
import {IERC20} from "../lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
import {SafeERC20} from "../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import {IVault} from "./interfaces/IVault.sol";
import {ICoreRef} from "./core/ICoreRef.sol";

contract VariableRate is ReentrancyGuard {
    using SafeERC20 for IERC20;

    /* Immutables */
    // solhint-disable var-name-mixedcase
    address public TOKEN;
    address public VAULT;
    address public OWNER;

    /* Variables */
    bool public initialized;
    uint256 public principal;

    function initialize(address token, address vault, address owner) external nonReentrant {
        require(!initialized, "VariableRate: already initialized");
        initialized = true;
        TOKEN = token;
        VAULT = vault;
        OWNER = owner;
    }

    function mint(uint256 amount) external nonReentrant onlyVault {
        require(IERC20(TOKEN).balanceOf(address(this)) >= principal + amount, "VariableRate: insufficient fund");
        principal += amount;
    }

    function burn(
        uint256 amount,
        uint256 minYield
    ) external nonReentrant onlyOwner returns (uint256 yield, uint256 fee) {
        require(amount <= principal, "VariableRate: overspend");
        (yield, fee) = IVault(VAULT).burnVariableRate(amount, minYield);
        require(IERC20(TOKEN).balanceOf(address(this)) >= principal + yield + fee, "VariableRate: insufficient fund");
        principal -= amount;
        IERC20(TOKEN).safeTransfer(OWNER, amount + yield + fee);
    }

    function withdraw(uint256 amount) external nonReentrant onlyOwner onlyEmergency {
        require(amount <= principal, "VariableRate: overspend");
        principal -= amount;
        IERC20(TOKEN).safeTransfer(OWNER, amount);
    }

    modifier onlyOwner() {
        require(msg.sender == OWNER, "VariableRate: not owner");
        _;
    }

    modifier onlyVault() {
        require(msg.sender == VAULT, "VariableRate: not vault");
        _;
    }

    modifier onlyEmergency() {
        require(ICoreRef(VAULT).emergency(), "VariableRate: not emergency");
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ReentrancyGuard} from "../../lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";
import {Multicall} from "../../lib/openzeppelin-contracts/contracts/utils/Multicall.sol";
import {IERC20} from "../../lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
import {SafeERC20} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import {ERC721} from "../../lib/openzeppelin-contracts/contracts/token/ERC721/ERC721.sol";
import {IVault} from "../interfaces/IVault.sol";
import {IYieldStrippedToken} from "../interfaces/IYieldStrippedToken.sol";
import {BlastManager} from "../libraries/BlastManager.sol";
import {FixedRate} from "../FixedRate.sol";

contract FixedRateNFT is ERC721, ReentrancyGuard, Multicall, BlastManager {
    using SafeERC20 for IERC20;

    /* Immutables */
    // solhint-disable var-name-mixedcase
    address public TOKEN;
    address public VAULT;

    /* Storage */
    mapping(uint256 => address) public fixedRateContracts;

    /* Events */
    event Mint(
        address indexed user,
        uint256 id,
        address indexed fixedRateContract,
        uint256 lockedYield,
        uint256 maturityTimestamp);
    event Burn(address indexed user, uint256 id, uint256 amount, uint256 yieldToUnlock, uint256 yieldToRelease);
    event Withdraw(address indexed user, uint256 id, uint256 amount);

    constructor(address token, address vault, string memory name, string memory symbol) ERC721(name, symbol) {
        TOKEN = token;
        VAULT = vault;
    }

    function mint(
        uint256 amount,
        uint256 minLockedYield
    )
        external
        nonReentrant
        returns (uint256 id, address fixedRateContract, uint256 lockedYield, uint256 maturityTimestamp)
    {
        // transfer in the amount
        IERC20(TOKEN).safeTransferFrom(msg.sender, address(this), amount);

        // approve the vault spending to only the amount
        IERC20(TOKEN).approve(VAULT, amount);

        // mint
        (fixedRateContract, lockedYield, maturityTimestamp) = IVault(VAULT).mintFixedRate(
            amount,
            minLockedYield,
            address(this)
        );

        // approve the vault spending back to zero
        IERC20(TOKEN).approve(VAULT, 0);

        // mint the NFT id
        id = FixedRate(fixedRateContract).id();
        fixedRateContracts[id] = fixedRateContract;
        _safeMint(msg.sender, id);

        emit Mint(msg.sender, id, fixedRateContract, lockedYield, maturityTimestamp);
    }

    function burn(
        uint256 tokenId,
        uint256 amount
    ) external nonReentrant onlyOwner(tokenId) returns (uint256 yieldToUnlock, uint256 yieldToRelease) {
        uint256 balanceBefore = IERC20(TOKEN).balanceOf(address(this));
        (yieldToUnlock, yieldToRelease) = FixedRate(fixedRateContracts[tokenId]).burn(amount);
        require(
            IERC20(TOKEN).balanceOf(address(this)) == balanceBefore + amount + yieldToRelease,
            "FixedRateNFT: insufficient fund"
        );
        IYieldStrippedToken(TOKEN).unwrapTo(amount + yieldToRelease, msg.sender);
        emit Burn(msg.sender, tokenId, amount, yieldToUnlock, yieldToRelease);
    }

    function withdraw(uint256 tokenId, uint256 amount) external nonReentrant onlyOwner(tokenId) {
        uint256 balanceBefore = IERC20(TOKEN).balanceOf(address(this));
        FixedRate(fixedRateContracts[tokenId]).withdraw(amount);
        require(IERC20(TOKEN).balanceOf(address(this)) == balanceBefore + amount, "FixedRateNFT: insufficient fund");
        IERC20(TOKEN).safeTransfer(msg.sender, amount);
        emit Withdraw(msg.sender, tokenId, amount);
    }

    modifier onlyOwner(uint256 tokenId) {
        require(msg.sender == ownerOf(tokenId), "FixedRateNFT: not owner");
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ReentrancyGuard} from "../../lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";
import {Multicall} from "../../lib/openzeppelin-contracts/contracts/utils/Multicall.sol";
import {IERC20} from "../../lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
import {SafeERC20} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import {ERC721} from "../../lib/openzeppelin-contracts/contracts/token/ERC721/ERC721.sol";
import {IVault} from "../interfaces/IVault.sol";
import {IYieldStrippedToken} from "../interfaces/IYieldStrippedToken.sol";
import {BlastManager} from "../libraries/BlastManager.sol";
import {VariableRate} from "../VariableRate.sol";

contract VariableRateNFT is ERC721, ReentrancyGuard, Multicall, BlastManager {
    using SafeERC20 for IERC20;

    /* Immutables */
    // solhint-disable var-name-mixedcase
    address public TOKEN;
    address public VAULT;

    /* Variables */
    uint256 private _tokenId;

    /* Storage */
    mapping(uint256 => address) public variableRateContracts;

    /* Events */
    event Mint(address indexed user, uint256 id, address indexed variableRateContract, uint256 amount);
    event Burn(address indexed user, uint256 id, uint256 amount, uint256 yield, uint256 positionFee);
    event Withdraw(address indexed user, uint256 id, uint256 amount);

    constructor(address token, address vault, string memory name, string memory symbol) ERC721(name, symbol) {
        TOKEN = token;
        VAULT = vault;
    }

    function mint(uint256 amount) external nonReentrant returns (uint256 id, address variableRateContract) {
        // transfer in the amount
        IERC20(TOKEN).safeTransferFrom(msg.sender, address(this), amount);

        // approve the vault spending to only the amount
        IERC20(TOKEN).approve(VAULT, amount);

        // mint
        variableRateContract = IVault(VAULT).mintVariableRate(amount, address(this));

        // approve the vault spending back to zero
        IERC20(TOKEN).approve(VAULT, 0);

        // mint the NFT id
        id = _tokenId++;
        variableRateContracts[id] = variableRateContract;
        _safeMint(msg.sender, id);

        emit Mint(msg.sender, id, variableRateContract, amount);
    }

    function burn(
        uint256 tokenId,
        uint256 amount,
        uint256 minYield
    ) external nonReentrant onlyOwner(tokenId) returns (uint256 yield, uint256 fee) {
        uint256 balanceBefore = IERC20(TOKEN).balanceOf(address(this));
        (yield, fee) = VariableRate(variableRateContracts[tokenId]).burn(amount, minYield);
        require(
            IERC20(TOKEN).balanceOf(address(this)) == balanceBefore + amount + yield + fee,
            "VariableRate: insufficient fund"
        );
        IYieldStrippedToken(TOKEN).unwrapTo(amount + yield + fee, msg.sender);
        emit Burn(msg.sender, tokenId, amount, yield, fee);
    }

    function withdraw(uint256 tokenId, uint256 amount) external nonReentrant onlyOwner(tokenId) {
        uint256 balanceBefore = IERC20(TOKEN).balanceOf(address(this));
        VariableRate(variableRateContracts[tokenId]).withdraw(amount);
        require(IERC20(TOKEN).balanceOf(address(this)) == balanceBefore + amount, "VariableRate: insufficient fund");
        IERC20(TOKEN).safeTransfer(msg.sender, amount);
        emit Withdraw(msg.sender, tokenId, amount);
    }

    modifier onlyOwner(uint256 tokenId) {
        require(msg.sender == ownerOf(tokenId), "VariableRate: not owner");
        _;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ERC20} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol";
import {ERC20Burnable} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import {CoreRef} from "../core/CoreRef.sol";
import {BlastManager} from "../libraries/BlastManager.sol";
import {IDuoAssetToken} from "../interfaces/IDuoAssetToken.sol";

contract DuoAssetToken is IDuoAssetToken, ERC20Burnable, CoreRef, BlastManager {
    // solhint-disable-next-line var-name-mixedcase
    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint256) public nonces;

    constructor(string memory name_, string memory symbol_, address core_) ERC20(name_, symbol_) CoreRef(core_) {
        uint256 chainId;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name())),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }

    /**
     * @notice mint new tokens
     * @param account the address of the destination account
     * @param amount the number of tokens to be minted
     */
    function mint(address account, uint256 amount) external override onlyMinter {
        _mint(account, amount);
        emit Minting(account, msg.sender, amount);
    }

    /**
     * @notice burn Duo asset tokens from caller
     * @param amount the amount to burn
     */
    function burn(uint256 amount) public override(IDuoAssetToken, ERC20Burnable) {
        super.burn(amount);
        emit Burning(msg.sender, msg.sender, amount);
    }

    /**
     * @notice burn Duo asset tokens from specified account
     * @param account the account to burn from
     * @param amount the amount to burn
     */
    function burnFrom(address account, uint256 amount) public override(IDuoAssetToken, ERC20Burnable) onlyBurner {
        _burn(account, amount);
        emit Burning(account, msg.sender, amount);
    }

    /**
     * @notice triggers an approval from owner to spends
     * @param owner the address to approve from
     * @param spender the address to be approved
     * @param value the number of tokens that are approved (2^256-1 means infinite)
     * @param deadline the time at which to expire the signature
     * @param v the recovery byte of the signature
     * @param r half of the ECDSA signature pair
     * @param s half of the ECDSA signature pair
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(deadline >= block.timestamp, "Duo: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Duo: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ICore} from "../core/ICore.sol";
import {ICoreRef} from "./ICoreRef.sol";

/// @title A Reference to Core
/// @notice defines some modifiers and utilities around interacting with Core
abstract contract CoreRef is ICoreRef {
    ICore private _core;

    // solhint-disable-next-line var-name-mixedcase
    bool public EMERGENCY;

    /// @notice CoreRef constructor
    /// @param coreAddress Few Core to reference
    constructor(address coreAddress) {
        _core = ICore(coreAddress);
    }

    modifier onlyMinter() {
        require(_core.isMinter(msg.sender), "CoreRef: Caller is not a minter");
        _;
    }

    modifier onlyBurner() {
        require(_core.isBurner(msg.sender), "CoreRef: Caller is not a burner");
        _;
    }

    modifier onlyGovernor() {
        require(_core.isGovernor(msg.sender), "CoreRef: Caller is not a governor");
        _;
    }

    modifier onlyGuardianOrGovernor() {
        require(
            _core.isGovernor(msg.sender) || _core.isGuardian(msg.sender),
            "CoreRef: Caller is not a guardian or governor"
        );
        _;
    }

    /// @notice set new Core reference address
    /// @param coreAddress the new core address
    function setCore(address coreAddress) external override onlyGovernor {
        _core = ICore(coreAddress);
        emit CoreUpdate(coreAddress);
    }

    function emergency() external view override returns (bool) {
        return EMERGENCY;
    }

    function startEmergency() external override onlyGuardianOrGovernor {
        EMERGENCY = true;
        emit EmergencyUpdate(true);
    }

    function stopEmergency() external override onlyGuardianOrGovernor {
        EMERGENCY = false;
        emit EmergencyUpdate(false);
    }

    /// @notice address of the Core contract referenced
    /// @return ICore implementation address
    function core() public view override returns (ICore) {
        return _core;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

enum YieldMode {
    AUTOMATIC,
    DISABLED,
    CLAIMABLE
}

enum GasMode {
    VOID,
    CLAIMABLE
}

interface IBlast {
    // configure
    function configureContract(
        address contractAddress,
        YieldMode _yield,
        GasMode gasMode,
        address governor
    ) external;

    function configure(
        YieldMode _yield,
        GasMode gasMode,
        address governor
    ) external;

    // base configuration options
    function configureClaimableYield() external;

    function configureClaimableYieldOnBehalf(address contractAddress) external;

    function configureAutomaticYield() external;

    function configureAutomaticYieldOnBehalf(address contractAddress) external;

    function configureVoidYield() external;

    function configureVoidYieldOnBehalf(address contractAddress) external;

    function configureClaimableGas() external;

    function configureClaimableGasOnBehalf(address contractAddress) external;

    function configureVoidGas() external;

    function configureVoidGasOnBehalf(address contractAddress) external;

    function configureGovernor(address _governor) external;

    function configureGovernorOnBehalf(
        address _newGovernor,
        address contractAddress
    ) external;

    // claim yield
    function claimYield(
        address contractAddress,
        address recipientOfYield,
        uint256 amount
    ) external returns (uint256);

    function claimAllYield(
        address contractAddress,
        address recipientOfYield
    ) external returns (uint256);

    // claim gas
    function claimAllGas(
        address contractAddress,
        address recipientOfGas
    ) external returns (uint256);

    function claimGasAtMinClaimRate(
        address contractAddress,
        address recipientOfGas,
        uint256 minClaimRateBips
    ) external returns (uint256);

    function claimMaxGas(
        address contractAddress,
        address recipientOfGas
    ) external returns (uint256);

    function claimGas(
        address contractAddress,
        address recipientOfGas,
        uint256 gasToClaim,
        uint256 gasSecondsToConsume
    ) external returns (uint256);

    // read functions
    function readClaimableYield(
        address contractAddress
    ) external view returns (uint256);

    function readYieldConfiguration(
        address contractAddress
    ) external view returns (uint8);

    function readGasParams(
        address contractAddress
    )
        external
        view
        returns (
            uint256 etherSeconds,
            uint256 etherBalance,
            uint256 lastUpdated,
            GasMode
        );
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

interface IBlastPoints {
    /**
     * @notice Blast standard: configure for blast point operator address
     * @param operator the blast points operator address
     */
    function configurePointsOperator(address operator) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ICore} from "../core/ICore.sol";

/// @title CoreRef interface
interface ICoreRef {
    event CoreUpdate(address indexed _core);
    event EmergencyUpdate(bool _emergency);
    event MinterUpdate(address indexed _minter, bool _status);
    event BurnerUpdate(address indexed _burner, bool _status);

    function emergency() external view returns (bool);

    function startEmergency() external;

    function stopEmergency() external;

    function setCore(address coreAddress) external;

    function core() external view returns (ICore);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }
}

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

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

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

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {IERC20} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol";

interface IDuoAssetToken is IERC20 {
    event Minting(address indexed _to, address indexed _minter, uint256 _amount);
    event Burning(address indexed _to, address indexed _burner, uint256 _amount);

    function burn(uint256 amount) external;

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function burnFrom(address account, uint256 amount) external;

    function mint(address account, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

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

/// @title Core Interface
interface ICore is IPermissions {
    function init() external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

/// @title Permissions interface
interface IPermissions {
    // ----------- Governor only state changing api -----------

    function createRole(bytes32 role, bytes32 adminRole) external;

    function grantGovernor(address governor) external;

    function grantGuardian(address guardian) external;

    function grantMinter(address minter) external;

    function grantBurner(address burner) external;

    function revokeGovernor(address governor) external;

    function revokeGuardian(address guardian) external;

    function revokeMinter(address minter) external;

    function revokeBurner(address burner) external;

    // ----------- Revoker only state changing api -----------

    function revokeOverride(bytes32 role, address account) external;

    // ----------- Getters -----------

    function isGovernor(address _address) external view returns (bool);

    function isGuardian(address _address) external view returns (bool);

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

    function isBurner(address _address) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

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