// File: contracts/ERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import { EIP712 } from "./external/openzeppelin/draft-EIP712.sol";
import { ECDSA } from "./external/openzeppelin/ECDSA.sol";

import { IERC20 } from "./interfaces/IERC20.sol";

contract ERC20 is IERC20, EIP712 {
    /*///////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;
    string public symbol;
    uint8 public immutable decimals;

    /*///////////////////////////////////////////////////////////////
                            ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    /*///////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // keccak256("Transfer(address owner,address to,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant TRANSFER_TYPEHASH = 0x42ce63790c28229c123925d83266e77c04d28784552ab68b350a9003226cbd59;
    mapping(address => uint256) public override nonces;

    /*///////////////////////////////////////////////////////////////
                            CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) EIP712(_name, "1") {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
    }

    /*///////////////////////////////////////////////////////////////
                            ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function approve(address spender, uint256 amount) external override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        uint256 currentAllowance = allowance[sender][msg.sender];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        if (currentAllowance < type(uint256).max) {
            _approve(sender, msg.sender, currentAllowance - amount);
        }
        _transfer(sender, recipient, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) external returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {
        uint256 currentAllowance = allowance[msg.sender][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(msg.sender, spender, currentAllowance - subtractedValue);
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 senderBalance = balanceOf[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            balanceOf[sender] = senderBalance - amount;
        }
        balanceOf[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    function _approve(
        address _owner,
        address spender,
        uint256 amount
    ) private {
        require(_owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        allowance[_owner][spender] = amount;
        emit Approval(_owner, spender, amount);
    }

    /*///////////////////////////////////////////////////////////////
                            BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function burn(uint256 amount) external override returns (bool) {
        _burn(msg.sender, amount);
        return true;
    }

    function burnFrom(address account, uint256 amount) external override returns (bool) {
        uint256 currentAllowance = allowance[account][msg.sender];
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, msg.sender, currentAllowance - amount);
        }
        _burn(account, amount);
        return true;
    }

    /*///////////////////////////////////////////////////////////////
                       INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        totalSupply += amount;
        balanceOf[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        uint256 accountBalance = balanceOf[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            balanceOf[account] = accountBalance - amount;
        }
        totalSupply -= amount;

        emit Transfer(account, address(0), amount);
    }

    /*///////////////////////////////////////////////////////////////
                            EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function DOMAIN_SEPARATOR() external view override returns (bytes32) {
        return _domainSeparatorV4();
    }

    function permit(
        address _owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(_owner != address(0), "ERC20Permit: zero address");
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(abi.encode(PERMIT_TYPEHASH, _owner, spender, value, nonces[_owner]++, deadline));
        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == _owner, "ERC20Permit: invalid signature");

        _approve(_owner, spender, value);
    }

    function transferWithPermit(
        address _owner,
        address to,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override returns (bool) {
        require(_owner != address(0) && to != address(0), "ERC20Permit: zero address");
        require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

        bytes32 structHash = keccak256(abi.encode(TRANSFER_TYPEHASH, _owner, to, value, nonces[_owner]++, deadline));
        bytes32 hash = _hashTypedDataV4(structHash);

        address signer = ECDSA.recover(hash, v, r, s);
        require(signer == _owner, "ERC20Permit: invalid signature");

        _transfer(_owner, to, value);
        return true;
    }
}
// File: contracts/ERC20Fee.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import { ERC20 } from "./ERC20.sol";
import { Ownable } from "./helpers/Ownable.sol";
import { IFeeManager } from "./interfaces/IFeeManager.sol";

contract ERC20Fee is ERC20, Ownable {
    /*///////////////////////////////////////////////////////////////
                            FEE-ON-TRANSFER STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 private constant TOTAL_FEE = 400;
    uint256 private constant BPS_MULTIPLIER = 10000;

    uint256 private constant MAX_WALLET_BALANCE = 300_000 * 10**18;

    mapping(address => bool) public isExcludedFee;
    mapping(address => bool) public isForcedFee;

    uint256 private _feeSell;
    uint256 private _feeBuy;
    uint256 private _feeTransfer;

    address public feeRecipient;
    bool public isFeeManager;

    /*///////////////////////////////////////////////////////////////
                            FEE-ON-TRANSFER EVENTS
    //////////////////////////////////////////////////////////////*/

    event ExcludeFee(address account, bool excluded);
    event ForcedFee(address account, bool forced);
    event FeeRecipientChanged(address feeRecipient, bool isFeeManager);

    /*///////////////////////////////////////////////////////////////
                            CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) ERC20(_name, _symbol, _decimals) {
        _feeSell = TOTAL_FEE;
        _feeBuy = TOTAL_FEE;
    }

    /*///////////////////////////////////////////////////////////////
                            FEE-ON-TRANSFER LOGIC
    //////////////////////////////////////////////////////////////*/

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual override {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 senderBalance = balanceOf[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            balanceOf[sender] = senderBalance - amount;
        }

        uint256 fee = feeRecipient != address(0) ? _calcFee(sender, recipient, amount) : 0;

        require(balanceOf[recipient] + amount - fee <= MAX_WALLET_BALANCE, "ERC20: allowed balance per wallet exceeds max balance!");

        if (fee > 0) {
            balanceOf[recipient] += (amount - fee);
            balanceOf[feeRecipient] += fee;
            emit Transfer(sender, recipient, (amount - fee));
            emit Transfer(sender, feeRecipient, fee);

            if (isFeeManager && IFeeManager(feeRecipient).canSyncFee(sender, recipient)) {
                IFeeManager(feeRecipient).syncFee();
            }
        } else {
            balanceOf[recipient] += amount;
            emit Transfer(sender, recipient, amount);
        }
    }

    function setExcludedFee(address account, bool excluded) external onlyOwner {
        isExcludedFee[account] = excluded;
        emit ExcludeFee(account, excluded);
    }

    function setForcedFee(address account, bool forced) external onlyOwner {
        isForcedFee[account] = forced;
        emit ForcedFee(account, forced);
    }

    function getFees()
        external
        view
        returns (
            uint256 feeSell,
            uint256 feeBuy,
            uint256 feeTransfer
        )
    {
        return (_feeSell, _feeBuy, _feeTransfer);
    }

    function changeFeeRecipient(address _feeRecipient, bool _isFeeManager) external onlyOwner {
        feeRecipient = _feeRecipient;
        isFeeManager = _isFeeManager;
        emit FeeRecipientChanged(feeRecipient, isFeeManager);
    }

    function _calcFee(
        address from,
        address to,
        uint256 amount
    ) private view returns (uint256 fee) {
        if (from != address(0) && to != address(0) && !isExcludedFee[from] && !isExcludedFee[to]) {
            if (isForcedFee[to]) {
                fee = _calcBPS(amount, _feeSell);
            } else if (isForcedFee[from]) {
                fee = _calcBPS(amount, _feeBuy);
            } else {
                fee = _calcBPS(amount, _feeTransfer);
            }
        }
    }

    function _calcBPS(uint256 amount, uint256 feeBPS) private pure returns (uint256) {
        return (amount * feeBPS) / BPS_MULTIPLIER;
    }
}
// File: contracts/external/openzeppelin/draft-EIP712.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 name,
        bytes32 version
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, name, version, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}
// File: contracts/external/openzeppelin/ECDSA.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

/**
 * @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 {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode 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 {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            // solhint-disable-next-line no-inline-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
        } else if (signature.length == 64) {
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            // solhint-disable-next-line no-inline-assembly
            assembly {
                let vs := mload(add(signature, 0x40))
                r := mload(add(signature, 0x20))
                s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
                v := add(shr(255, vs), 27)
            }
        } else {
            revert("ECDSA: invalid signature length");
        }

        return recover(hash, v, r, s);
    }

    /**
     * @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) {
        // 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 (281): 0 < s < secp256k1n � 2 + 1, and for v in (282): 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.
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}
// File: contracts/helpers/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

contract OwnableData {
    address public owner;
    address public pendingOwner;
}

contract Ownable is OwnableData {
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev `owner` defaults to msg.sender on construction.
     */
    constructor() {
        _setOwner(msg.sender);
    }

    /**
     * @dev Transfers ownership to `newOwner`. Either directly or claimable by the new pending owner.
     *      Can only be invoked by the current `owner`.
     * @param _newOwner Address of the new owner.
     * @param _direct True if `_newOwner` should be set immediately. False if `_newOwner` needs to use `claimOwnership`.
     * @param _renounce Allows the `_newOwner` to be `address(0)` if `_direct` and `_renounce` is True. Has no effect otherwise
     */
    function transferOwnership(
        address _newOwner,
        bool _direct,
        bool _renounce
    ) external onlyOwner {
        if (_direct) {
            require(_newOwner != address(0) || _renounce, "zero address");

            emit OwnershipTransferred(owner, _newOwner);
            owner = _newOwner;
            pendingOwner = address(0);
        } else {
            pendingOwner = _newOwner;
        }
    }

    /**
     * @dev Needs to be called by `pendingOwner` to claim ownership.
     */
    function claimOwnership() external {
        address _pendingOwner = pendingOwner;
        require(msg.sender == _pendingOwner, "caller != pending owner");

        emit OwnershipTransferred(owner, _pendingOwner);
        owner = _pendingOwner;
        pendingOwner = address(0);
    }

    /**
     * @dev Throws if called by any account other than the Owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner, "caller is not the owner");
        _;
    }

    function _setOwner(address newOwner) internal {
        address oldOwner = owner;
        owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// File: contracts/helpers/TransactionThrottler.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import { Ownable } from "./Ownable.sol";

contract TransactionThrottler is Ownable {
    bool private _initialized;
    bool private _restrictionActive;
    uint256 private _tradingStart;
    uint256 private _maxTransferAmount;
    uint256 private constant _delayBetweenTx = 120;
    mapping(address => uint256) private _previousTx;

    event RestrictionActiveChanged(bool active);
    event MaxTransferAmountChanged(uint256 maxTransferAmount);
    
    function initAntibot() external onlyOwner {
        require(!_initialized, "Protection: Already initialized");
        _initialized = true;
        _restrictionActive = true;
        _maxTransferAmount = 25_000 * 10**18;

        emit RestrictionActiveChanged(_restrictionActive);
        emit MaxTransferAmountChanged(_maxTransferAmount);
    }

    function setMaxTransferAmount(uint256 amount) external onlyOwner {
        _maxTransferAmount = amount;
        emit MaxTransferAmountChanged(_maxTransferAmount);
    }

    function setRestrictionActive(bool active) external onlyOwner {
        require(active == false, "Protection: operation is prohibited!");
        _restrictionActive = active;
        emit RestrictionActiveChanged(_restrictionActive);
    }

    modifier transactionThrottler(
        address sender,
        address recipient,
        uint256 amount
    ) {
        if (_restrictionActive) {         
            if (_maxTransferAmount > 0) {
                require(amount <= _maxTransferAmount, "Protection: Limit exceeded");
            }                 
            require(_previousTx[recipient] + _delayBetweenTx <= block.timestamp, "Protection: 120 sec/tx allowed");
            _previousTx[recipient] = block.timestamp;                
            require(_previousTx[sender] + _delayBetweenTx <= block.timestamp, "Protection: 120 sec/tx allowed");
            _previousTx[sender] = block.timestamp;        
        }
        _;
    }
}
// File: contracts/interfaces/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function balanceOf(address account) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function burn(uint256 amount) external returns (bool);
    function burnFrom(address account, uint256 amount) external returns (bool);

    // EIP 2612
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function nonces(address owner) external view returns (uint256);
    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
    function transferWithPermit(address target, address to, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external returns (bool);
}
// File: contracts/interfaces/IFeeManager.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

interface IFeeManager {
    function canSyncFee(address sender, address recipient) external view returns (bool);
    function syncFee() external;
}
// File: contracts/Spc.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import { ERC20Fee } from "./ERC20Fee.sol";
import { Ownable } from "./helpers/Ownable.sol";
import { TransactionThrottler } from "./helpers/TransactionThrottler.sol";

contract Spc is Ownable, ERC20Fee, TransactionThrottler {
    constructor(address _owner) ERC20Fee("SPC", "SPC", 18) {
        _setOwner(_owner);
        _mint(_owner, 10_000_000 * 10**18);
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override transactionThrottler(sender, recipient, amount) {
        super._transfer(sender, recipient, amount);
    }    
}