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// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import { MessageHashUtils } from "@openzeppelin/contracts/utils/cryptography/MessageHashUtils.sol";
import { Address } from "@openzeppelin/contracts/utils/Address.sol";
import { ReentrancyGuard } from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { IAggregatorV3 } from "./IAggregatorV3.sol";

/// @title PreSaleDop contract
/// @notice Implements the preSale of DOP token for testnet users
/// @notice The presale contract allows you to purchase dop token with allowed tokens
/// @notice The recorded DOP tokens and NFT claims will be distributed later using another distributor contract.

contract PreSaleDop is ReentrancyGuard, Ownable {
    using Address for address payable;

    /// @notice Thrown when purchase time is not started
    error PurchaseNotStarted();

    /// @notice Thrown when purchase time is ended
    error PurchaseEnded();

    /// @notice Thrown when address is blacklisted
    error Blacklisted();

    /// @notice Thrown when purchase is disabled
    error PurchaseDisabled();

    /// @notice Thrown when sign deadline is expired
    error DeadlineExpired();

    /// @notice Thrown when Sign is invalid
    error InvalidSignature();

    /// @notice Thrown when Eth price suddenly drops while purchasing with ETH
    error UnexpectedPriceDifference();

    /// @notice Thrown when value to transfer is zero
    error ZeroValue();

    /// @notice Thrown when minAllowed is greater than maxAllowed
    error MinValueExceedsMaxValue();

    /// @notice Thrown when price from priceFeed is zero
    error PriceNotFound();

    /// @notice Thrown if the price is not updated
    error PriceNotUpdated();

    /// @notice Thrown if the roundId of price is not updated
    error RoundIdNotUpdated();

    /// @notice Thrown when the start time is invalid
    error InvalidStartTime();

    /// @notice Thrown when the end time is invalid
    error InvalidEndTime();

    /// @notice Thrown when purchase amount is less than minimum allowed
    error PurchaseBelowMinimum();

    /// @notice Thrown when updating with the same value as previously stored
    error IdenticalValue();

    /// @notice Thrown when updating an address with zero address
    error ZeroAddress();

    /// @notice It is use to calculate dop value
    uint8 private immutable NORMALIZATION_FACTOR;

    /// @notice That isPurchaseEnabled or not
    bool public isPurchaseEnabled = true;

    /// @notice Time to start purchases
    uint256 public immutable purchaseStartTime;

    /// @notice Time to end purchases
    uint256 public immutable purchaseEndTime;

    /// @notice Price of token
    uint256 public immutable tokenPrice;

    /// @notice Allocation of every user. No user can purchase more than this value.
    uint256 public immutable maxAllowed;

    /// @notice No user can purchase less than this value.
    uint256 public immutable minAllowed;

    /// @notice Price updation time difference
    uint256 public immutable PRICE_UPDATE_TIMEOUT;

    /// @notice The price feed contract address
    IAggregatorV3 internal immutable dataFeed;

    /// @notice The address of signerWallet
    address public signerWallet;

    /// @notice The address of fundsWallet
    address public fundsWallet;

    /// @notice Gives claim info of user
    mapping(address => uint256) public claims;

    /// @notice Gives purchases of the users
    mapping(address => uint256) public purchases;

    /// @notice Gives info about address's permission
    mapping(address => bool) public blacklistAddress;

    /// @dev Emitted when dop is purchased with ETH
    event PurchasedWithETH(address indexed by, uint256 amountPurchasedEth, uint256 dopPurchased);

    /// @dev Emitted when address of signer is updated
    event SignerUpdated(address oldSigner, address newSigner);

    /// @dev Emitted when address of funds wallet is updated
    event FundsWalletUpdated(address oldAddress, address newAddress);

    /// @dev Emitted when blacklist access of address is updated
    event BlacklistUpdated(address which, bool accessNow);

    /// @dev Emitted when purchase access changes
    event PurchaseEnableUpdated(bool oldStatus, bool newStatus);

    /// @dev Emitted when starting token purchase
    event PurchaseCreated(uint256 indexed startTime, uint256 indexed endTime, uint256 indexed price);

    /// @notice Restricts when updating wallet/contract address to zero address
    modifier checkAddressZero(address which) {
        if (which == address(0)) {
            revert ZeroAddress();
        }
        _;
    }

    /// @notice Ensures that purchase is enabled when purchasing
    modifier canPurchase() {
        if (!isPurchaseEnabled) {
            revert PurchaseDisabled();
        }
        _;
    }

    /// @dev Constructor
    /// @param fundsWalletAddress The address of funds wallet
    /// @param signerAddress The address of signer wallet
    /// @param owner The address of owner wallet
    /// @param priceFeed The address of price feed contract
    /// @param startTime The start time of the purchase
    /// @param endTime The end time of the purchase
    /// @param price The DOP Token price in 18 decimals, because our calculations returns a value in 36 decimals and to get returning value in 18 decimals we divide by purchase price
    /// @param minimumDifference Time difference to check if ETH live price update occured in it
    /// @param maxPurchasePerUser Maximum limit of funds a user can particapte from
    /// @param minPurchasePerUser Minimum limit of funds a user can particapte from
    constructor(
        address fundsWalletAddress,
        address signerAddress,
        address owner,
        address priceFeed,
        uint8 normalizationFactor,
        uint256 startTime,
        uint256 endTime,
        uint256 price,
        uint256 minimumDifference,
        uint256 maxPurchasePerUser,
        uint256 minPurchasePerUser
    ) Ownable(owner) {
        if (
            fundsWalletAddress == address(0) ||
            signerAddress == address(0) ||
            owner == address(0) ||
            priceFeed == address(0)
        ) {
            revert ZeroAddress();
        }

        if (normalizationFactor == 0 || minimumDifference == 0 || maxPurchasePerUser == 0 || minPurchasePerUser == 0) {
            revert ZeroValue();
        }

        if (minPurchasePerUser > maxPurchasePerUser) {
            revert MinValueExceedsMaxValue();
        }

        if (startTime < block.timestamp) {
            revert InvalidStartTime();
        }

        if (endTime <= startTime) {
            revert InvalidEndTime();
        }

        purchaseStartTime = startTime;
        purchaseEndTime = endTime;
        tokenPrice = price;
        fundsWallet = fundsWalletAddress;
        signerWallet = signerAddress;
        dataFeed = IAggregatorV3(priceFeed);
        maxAllowed = maxPurchasePerUser;
        minAllowed = minPurchasePerUser;
        NORMALIZATION_FACTOR = normalizationFactor;
        PRICE_UPDATE_TIMEOUT = minimumDifference;
        emit PurchaseCreated({ startTime: startTime, endTime: endTime, price: price });
    }

    /// @notice Changes access of purchase
    /// @param enabled The decision about purchase
    function enablePurchase(bool enabled) external onlyOwner {
        if (isPurchaseEnabled == enabled) {
            revert IdenticalValue();
        }
        emit PurchaseEnableUpdated({ oldStatus: isPurchaseEnabled, newStatus: enabled });
        isPurchaseEnabled = enabled;
    }

    /// @notice Changes signer wallet address
    /// @param newSigner The address of the new signer wallet
    function changeSigner(address newSigner) external checkAddressZero(newSigner) onlyOwner {
        address oldSigner = signerWallet;
        if (oldSigner == newSigner) {
            revert IdenticalValue();
        }
        emit SignerUpdated({ oldSigner: oldSigner, newSigner: newSigner });
        signerWallet = newSigner;
    }

    /// @notice Changes funds wallet to a new address
    /// @param newFundsWallet The address of the new funds wallet
    function changeFundsWallet(address newFundsWallet) external checkAddressZero(newFundsWallet) onlyOwner {
        address oldWallet = fundsWallet;
        if (oldWallet == newFundsWallet) {
            revert IdenticalValue();
        }
        emit FundsWalletUpdated({ oldAddress: oldWallet, newAddress: newFundsWallet });
        fundsWallet = newFundsWallet;
    }

    /// @notice Changes the access of any address in contract interaction
    /// @param which The address for which access is updated
    /// @param access The access decision of `which` address
    function updateBlackListedUser(address which, bool access) external checkAddressZero(which) onlyOwner {
        bool oldAccess = blacklistAddress[which];
        if (oldAccess == access) {
            revert IdenticalValue();
        }
        emit BlacklistUpdated({ which: which, accessNow: access });
        blacklistAddress[which] = access;
    }

    /// @notice Purchases dopToken with Eth
    /// @param deadline The deadline is validity of the signature
    /// @param minAmountDop The minAmountDop user agrees to purchase
    /// @param v The `v` signature parameter
    /// @param r The `r` signature parameter
    /// @param s The `s` signature parameter
    function purchaseTokenWithEth(
        uint256 deadline,
        uint256 minAmountDop,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external payable canPurchase nonReentrant {
        // The input must have been signed by the presale signer
        uint256 actualPurchaseAmount = msg.value;
        uint256 prevPurchase = purchases[msg.sender];
        uint256 maxPurchaseAllowed = maxAllowed;

        if (prevPurchase + actualPurchaseAmount < minAllowed) {
            revert PurchaseBelowMinimum();
        }

        if (prevPurchase + actualPurchaseAmount > maxPurchaseAllowed) {
            actualPurchaseAmount = maxPurchaseAllowed - prevPurchase;
            payable(msg.sender).sendValue(msg.value - actualPurchaseAmount);
        }

        _validatePurchaseWithEth(actualPurchaseAmount, deadline, v, r, s);

        uint256 latestPrice = getLatestPrice();

        if (latestPrice == 0) {
            revert PriceNotFound();
        }

        uint256 toReturn = _calculateDop(actualPurchaseAmount, latestPrice, NORMALIZATION_FACTOR, tokenPrice);

        if (toReturn < minAmountDop) {
            revert UnexpectedPriceDifference();
        }

        claims[msg.sender] += toReturn;
        purchases[msg.sender] = prevPurchase + actualPurchaseAmount;

        payable(fundsWallet).sendValue(actualPurchaseAmount);

        emit PurchasedWithETH({ by: msg.sender, amountPurchasedEth: actualPurchaseAmount, dopPurchased: toReturn });
    }

    /// @notice Returns the user claim
    /// @param user Address of user
    function getClaims(address user) external view returns (uint256) {
        return claims[user];
    }

    /// @notice The Chainlink inherited function, give us ETH live price
    function getLatestPrice() public view returns (uint256) {
        (
            uint80 roundId,
            /*uint80 roundID*/ int price /*uint256 startedAt*/ /*uint80 answeredInRound*/,
            ,
            uint256 updatedAt,

        ) = /*uint256 timeStamp*/ dataFeed.latestRoundData();
        if (roundId == 0) {
            revert RoundIdNotUpdated();
        }
        if (updatedAt == 0 || block.timestamp - updatedAt > PRICE_UPDATE_TIMEOUT) {
            revert PriceNotUpdated();
        }

        return uint256(price);
    }

    /// @notice Checks value, if zero then reverts
    function _checkValue(uint256 value) private pure {
        if (value == 0) {
            revert ZeroValue();
        }
    }

    /// @notice The helper function which verifies signature, signed by signerWallet, reverts if Invalid
    function _verifySign(uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) private view {
        bytes32 encodedMessageHash = keccak256(abi.encodePacked(msg.sender, amount, deadline));
        _verifyMessage(encodedMessageHash, v, r, s);
    }

    /// @notice Verifies the address that signed a hashed message (`hash`) with
    /// `signature`
    function _verifyMessage(bytes32 encodedMessageHash, uint8 v, bytes32 r, bytes32 s) private view {
        if (signerWallet != ECDSA.recover(MessageHashUtils.toEthSignedMessageHash(encodedMessageHash), v, r, s)) {
            revert InvalidSignature();
        }
    }

    /// @notice Checks that address is blacklisted or not
    function _checkBlacklist(address which) private view {
        if (blacklistAddress[which]) {
            revert Blacklisted();
        }
    }

    /// @notice Validates value, deadline and signature
    function _validatePurchaseWithEth(uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) private view {
        _verifyInPurchase();
        _checkValue(amount);
        _validatePurchase(deadline);
        _verifySign(amount, deadline, v, r, s);
    }

    /// @notice Calculates the dop amount
    function _calculateDop(
        uint256 purchaseAmount,
        uint256 referenceTokenPrice,
        uint256 normalizationFactor,
        uint256 price
    ) private pure returns (uint256) {
        return (purchaseAmount * referenceTokenPrice * (10 ** normalizationFactor)) / price;
    }

    /// @notice Validates blacklist address and deadline
    function _validatePurchase(uint256 deadline) private view {
        if (block.timestamp > deadline) {
            revert DeadlineExpired();
        }
        _checkBlacklist(msg.sender);
    }

    /// @notice Checks purchase start and end time, reverts if Invalid
    function _verifyInPurchase() internal view {
        if (block.timestamp < purchaseStartTime) {
            revert PurchaseNotStarted();
        }
        if (block.timestamp >= purchaseEndTime) {
            revert PurchaseEnded();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

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

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

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

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

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) 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 FailedInnerCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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 v5.0.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.20;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS
    }

    /**
     * @dev The signature derives the `address(0)`.
     */
    error ECDSAInvalidSignature();

    /**
     * @dev The signature has an invalid length.
     */
    error ECDSAInvalidSignatureLength(uint256 length);

    /**
     * @dev The signature has an S value that is in the upper half order.
     */
    error ECDSAInvalidSignatureS(bytes32 s);

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
     * return address(0) without also returning an error description. Errors are documented using an enum (error type)
     * and a bytes32 providing additional information about the error.
     *
     * If no error is returned, then the address can be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError, bytes32) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     */
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError, bytes32) {
        unchecked {
            bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
            // We do not check for an overflow here since the shift operation results in 0 or 1.
            uint8 v = uint8((uint256(vs) >> 255) + 27);
            return tryRecover(hash, v, r, s);
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError, bytes32) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS, s);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature, bytes32(0));
        }

        return (signer, RecoverError.NoError, bytes32(0));
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
     */
    function _throwError(RecoverError error, bytes32 errorArg) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert ECDSAInvalidSignature();
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert ECDSAInvalidSignatureLength(uint256(errorArg));
        } else if (error == RecoverError.InvalidSignatureS) {
            revert ECDSAInvalidSignatureS(errorArg);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/cryptography/MessageHashUtils.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Signature message hash utilities for producing digests to be consumed by {ECDSA} recovery or signing.
 *
 * The library provides methods for generating a hash of a message that conforms to the
 * https://eips.ethereum.org/EIPS/eip-191[EIP 191] and https://eips.ethereum.org/EIPS/eip-712[EIP 712]
 * specifications.
 */
library MessageHashUtils {
    /**
     * @dev Returns the keccak256 digest of an EIP-191 signed data with version
     * `0x45` (`personal_sign` messages).
     *
     * The digest is calculated by prefixing a bytes32 `messageHash` with
     * `"\x19Ethereum Signed Message:\n32"` and hashing the result. It corresponds with the
     * hash signed when using the https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] JSON-RPC method.
     *
     * NOTE: The `messageHash` parameter is intended to be the result of hashing a raw message with
     * keccak256, although any bytes32 value can be safely used because the final digest will
     * be re-hashed.
     *
     * See {ECDSA-recover}.
     */
    function toEthSignedMessageHash(bytes32 messageHash) internal pure returns (bytes32 digest) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, "\x19Ethereum Signed Message:\n32") // 32 is the bytes-length of messageHash
            mstore(0x1c, messageHash) // 0x1c (28) is the length of the prefix
            digest := keccak256(0x00, 0x3c) // 0x3c is the length of the prefix (0x1c) + messageHash (0x20)
        }
    }

    /**
     * @dev Returns the keccak256 digest of an EIP-191 signed data with version
     * `0x45` (`personal_sign` messages).
     *
     * The digest is calculated by prefixing an arbitrary `message` with
     * `"\x19Ethereum Signed Message:\n" + len(message)` and hashing the result. It corresponds with the
     * hash signed when using the https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] JSON-RPC method.
     *
     * See {ECDSA-recover}.
     */
    function toEthSignedMessageHash(bytes memory message) internal pure returns (bytes32) {
        return
            keccak256(bytes.concat("\x19Ethereum Signed Message:\n", bytes(Strings.toString(message.length)), message));
    }

    /**
     * @dev Returns the keccak256 digest of an EIP-191 signed data with version
     * `0x00` (data with intended validator).
     *
     * The digest is calculated by prefixing an arbitrary `data` with `"\x19\x00"` and the intended
     * `validator` address. Then hashing the result.
     *
     * See {ECDSA-recover}.
     */
    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(hex"19_00", validator, data));
    }

    /**
     * @dev Returns the keccak256 digest of an EIP-712 typed data (EIP-191 version `0x01`).
     *
     * The digest is calculated from a `domainSeparator` and a `structHash`, by prefixing them with
     * `\x19\x01` and hashing the result. It corresponds to the hash signed by the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] JSON-RPC method as part of EIP-712.
     *
     * See {ECDSA-recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 digest) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, hex"19_01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            digest := keccak256(ptr, 0x42)
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)

pragma solidity ^0.8.20;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Muldiv operation overflow.
     */
    error MathOverflowedMulDiv();

    enum Rounding {
        Floor, // Toward negative infinity
        Ceil, // Toward positive infinity
        Trunc, // Toward zero
        Expand // Away from zero
    }

    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @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 towards infinity instead
     * of rounding towards zero.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        if (b == 0) {
            // Guarantee the same behavior as in a regular Solidity division.
            return a / b;
        }

        // (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 = x * y; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                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.
            if (denominator <= prod1) {
                revert MathOverflowedMulDiv();
            }

            ///////////////////////////////////////////////
            // 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.

            uint256 twos = denominator & (0 - denominator);
            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 (unsignedRoundsUp(rounding) && 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
     * towards zero.
     *
     * 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 + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2 of a positive value rounded towards zero.
     * 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 + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10 of a positive value rounded towards zero.
     * 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 + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256 of a positive value rounded towards zero.
     * 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 + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);
        }
    }

    /**
     * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.
     */
    function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {
        return uint8(rounding) % 2 == 1;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.20;

/**
 * @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);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    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
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // 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 v5.0.0) (utils/Strings.sol)

pragma solidity ^0.8.20;

import {Math} from "./math/Math.sol";
import {SignedMath} from "./math/SignedMath.sol";

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

    /**
     * @dev The `value` string doesn't fit in the specified `length`.
     */
    error StringsInsufficientHexLength(uint256 value, uint256 length);

    /**
     * @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), HEX_DIGITS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toStringSigned(int256 value) internal pure returns (string memory) {
        return string.concat(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) {
        uint256 localValue = value;
        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] = HEX_DIGITS[localValue & 0xf];
            localValue >>= 4;
        }
        if (localValue != 0) {
            revert StringsInsufficientHexLength(value, length);
        }
        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 bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

interface IAggregatorV3 {
    /// @notice 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`).
    function decimals() external view returns (uint8);

    /// @notice returns the description of the aggregator the proxy points to.
    function description() external view returns (string memory);

    /// @notice the version number representing the type of aggregator the proxy points to.
    function version() external view returns (uint256);

    /// @notice get data about a round. Consumers are encouraged to check
    /// that they're receiving fresh data by inspecting the updatedAt and
    /// answeredInRound return values.
    /// Note that different underlying implementations of AggregatorV3Interface
    /// have slightly different semantics for some of the return values. Consumers
    /// should determine what implementations they expect to receive
    /// data from and validate that they can properly handle return data from all
    /// of them.
    /// @param _roundId the round ID to retrieve the round data for
    /// @return roundId is the round ID from the aggregator for which the data was
    /// retrieved combined with a phase to ensure that round IDs get larger as
    /// time moves forward.
    /// @return answer is the answer for the given round
    /// @return startedAt is the timestamp when the round was started.
    /// (Only some AggregatorV3Interface implementations return meaningful values)
    /// @return updatedAt is the timestamp when the round last was updated (i.e.
    /// answer was last computed)
    /// @return answeredInRound is the round ID of the round in which the answer
    /// was computed.
    /// (Only some AggregatorV3Interface implementations return meaningful values)
    /// @dev Note that answer and updatedAt may change between queries.
    function getRoundData(
        uint80 _roundId
    )
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);

    /// @notice get data about the latest round. Consumers are encouraged to check
    /// that they're receiving fresh data by inspecting the updatedAt and
    /// answeredInRound return values.
    /// Note that different underlying implementations of AggregatorV3Interface
    /// have slightly different semantics for some of the return values. Consumers
    /// should determine what implementations they expect to receive
    /// data from and validate that they can properly handle return data from all
    /// of them.
    /// @return roundId is the round ID from the aggregator for which the data was
    /// retrieved combined with a phase to ensure that round IDs get larger as
    /// time moves forward.
    /// @return answer is the answer for the given round
    /// @return startedAt is the timestamp when the round was started.
    /// (Only some AggregatorV3Interface implementations return meaningful values)
    /// @return updatedAt is the timestamp when the round last was updated (i.e.
    /// answer was last computed)
    /// @return answeredInRound is the round ID of the round in which the answer
    /// was computed.
    /// (Only some AggregatorV3Interface implementations return meaningful values)
    /// @dev Note that answer and updatedAt may change between queries.
    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"fundsWalletAddress","type":"address"},{"internalType":"address","name":"signerAddress","type":"address"},{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"priceFeed","type":"address"},{"internalType":"uint8","name":"normalizationFactor","type":"uint8"},{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"minimumDifference","type":"uint256"},{"internalType":"uint256","name":"maxPurchasePerUser","type":"uint256"},{"internalType":"uint256","name":"minPurchasePerUser","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"AddressInsufficientBalance","type":"error"},{"inputs":[],"name":"Blacklisted","type":"error"},{"inputs":[],"name":"DeadlineExpired","type":"error"},{"inputs":[],"name":"ECDSAInvalidSignature","type":"error"},{"inputs":[{"internalType":"uint256","name":"length","type":"uint256"}],"name":"ECDSAInvalidSignatureLength","type":"error"},{"inputs":[{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"ECDSAInvalidSignatureS","type":"error"},{"inputs":[],"name":"FailedInnerCall","type":"error"},{"inputs":[],"name":"IdenticalValue","type":"error"},{"inputs":[],"name":"InvalidEndTime","type":"error"},{"inputs":[],"name":"InvalidSignature","type":"error"},{"inputs":[],"name":"InvalidStartTime","type":"error"},{"inputs":[],"name":"MinValueExceedsMaxValue","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[],"name":"PriceNotFound","type":"error"},{"inputs":[],"name":"PriceNotUpdated","type":"error"},{"inputs":[],"name":"PurchaseBelowMinimum","type":"error"},{"inputs":[],"name":"PurchaseDisabled","type":"error"},{"inputs":[],"name":"PurchaseEnded","type":"error"},{"inputs":[],"name":"PurchaseNotStarted","type":"error"},{"inputs":[],"name":"ReentrancyGuardReentrantCall","type":"error"},{"inputs":[],"name":"RoundIdNotUpdated","type":"error"},{"inputs":[],"name":"UnexpectedPriceDifference","type":"error"},{"inputs":[],"name":"ZeroAddress","type":"error"},{"inputs":[],"name":"ZeroValue","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"which","type":"address"},{"indexed":false,"internalType":"bool","name":"accessNow","type":"bool"}],"name":"BlacklistUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldAddress","type":"address"},{"indexed":false,"internalType":"address","name":"newAddress","type":"address"}],"name":"FundsWalletUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"startTime","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"endTime","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"price","type":"uint256"}],"name":"PurchaseCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"oldStatus","type":"bool"},{"indexed":false,"internalType":"bool","name":"newStatus","type":"bool"}],"name":"PurchaseEnableUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"by","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountPurchasedEth","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"dopPurchased","type":"uint256"}],"name":"PurchasedWithETH","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldSigner","type":"address"},{"indexed":false,"internalType":"address","name":"newSigner","type":"address"}],"name":"SignerUpdated","type":"event"},{"inputs":[],"name":"PRICE_UPDATE_TIMEOUT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"blacklistAddress","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newFundsWallet","type":"address"}],"name":"changeFundsWallet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSigner","type":"address"}],"name":"changeSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"claims","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"enabled","type":"bool"}],"name":"enablePurchase","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"fundsWallet","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getClaims","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLatestPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isPurchaseEnabled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxAllowed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minAllowed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"purchaseEndTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"purchaseStartTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint256","name":"minAmountDop","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"purchaseTokenWithEth","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"purchases","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"signerWallet","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"which","type":"address"},{"internalType":"bool","name":"access","type":"bool"}],"name":"updateBlackListedUser","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

-----Decoded View---------------
Arg [0] : fundsWalletAddress (address): 0xF95844e82447ebA0ce9EDe88810fDeab7b051d62
Arg [1] : signerAddress (address): 0x80a931FC0fDB0062548E46cbC60A69d3B7383FdD
Arg [2] : owner (address): 0x9D0CF00f85015567084E79A76a65D6F5e912b8d2
Arg [3] : priceFeed (address): 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
Arg [4] : normalizationFactor (uint8): 10
Arg [5] : startTime (uint256): 1711440000
Arg [6] : endTime (uint256): 1711638000
Arg [7] : price (uint256): 82000000000000000
Arg [8] : minimumDifference (uint256): 7200
Arg [9] : maxPurchasePerUser (uint256): 500000000000000000
Arg [10] : minPurchasePerUser (uint256): 100000000000000000

-----Encoded View---------------
11 Constructor Arguments found :
Arg [0] : 000000000000000000000000f95844e82447eba0ce9ede88810fdeab7b051d62
Arg [1] : 00000000000000000000000080a931fc0fdb0062548e46cbc60a69d3b7383fdd
Arg [2] : 0000000000000000000000009d0cf00f85015567084e79a76a65d6f5e912b8d2
Arg [3] : 0000000000000000000000005f4ec3df9cbd43714fe2740f5e3616155c5b8419
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [5] : 0000000000000000000000000000000000000000000000000000000066028080
Arg [6] : 00000000000000000000000000000000000000000000000000000000660585f0
Arg [7] : 00000000000000000000000000000000000000000000000001235290c7950000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000001c20
Arg [9] : 00000000000000000000000000000000000000000000000006f05b59d3b20000
Arg [10] : 000000000000000000000000000000000000000000000000016345785d8a0000