// File: @openzeppelin/contracts/proxy/Clones.sol


// OpenZeppelin Contracts (last updated v4.9.0) (proxy/Clones.sol)

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 * _Available since v3.4._
 */
library Clones {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create(0, 0x09, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create2(0, 0x09, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt,
        address deployer
    ) internal pure returns (address predicted) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(add(ptr, 0x38), deployer)
            mstore(add(ptr, 0x24), 0x5af43d82803e903d91602b57fd5bf3ff)
            mstore(add(ptr, 0x14), implementation)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73)
            mstore(add(ptr, 0x58), salt)
            mstore(add(ptr, 0x78), keccak256(add(ptr, 0x0c), 0x37))
            predicted := keccak256(add(ptr, 0x43), 0x55)
        }
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt
    ) internal view returns (address predicted) {
        return predictDeterministicAddress(implementation, salt, address(this));
    }
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// File: MineFactory.sol


pragma solidity ^0.8.2;



interface IMineToken {
    struct ConfigInfo {
        uint256 difficulty;// default: 1 -> hash: 0x0 2 -> hash: 0x00, max: 5 -> hash: 0x00000
        uint256 diffStep;// default: 0 -> add difficulty is disable. 200 -> every mint 20% should add difficulty
        uint256 reward;// 10000 ether
        uint256 reduce;// reduce rate, default: 500 -> 50%
        uint256 reduceStep;//default: 0 -> reduce is disable. 100 -> every mint 10% should reduce
        uint256 maxLimit;// default: 0 -> infinite
        uint256 maxDifficulty;
        uint256 startTimestamp;
        
    }

    struct TokenInfo {
        string name;
        string symbol;
        uint8 decimals;
        uint256 maxSupply;
    }

    struct CurrentInfo {
       uint256 reward;
       uint256 difficulty;
       uint256 diffBlock;
       uint256 nextDifficultyBreak;
       uint256 nextReduceBreak;
       uint256 reduceBlock;
       uint256 fee;
       address vault;
       uint256 created;
       address token;
       uint256 minted;
       address creater;
    }

    struct MintInfo {
        uint256 breakTime;
        uint256 round;
    }

    function init(ConfigInfo calldata _c, TokenInfo calldata _t, address sender) external;

    function config() external view returns (ConfigInfo memory);
    function tokenInfo() external view returns (TokenInfo memory);

    function currentInfo() external view returns (CurrentInfo memory);

    function mintInfoOf(address account) external view returns (MintInfo memory);
}

interface IMineFactory {
    function fee() external view returns (uint256);
    function vault() external view returns (address);
}

contract MineFactory {

    bytes32[] _nameList;

    mapping (bytes32 => address) _nameCheck;

    address public _clone;

    uint256 public fee;// service fee. buyback or reward to Cassino Token Holders;
    address public vault;

    address public feeSetter;

    event NewToken(address token, address creater, uint256 created);

    constructor(uint256 _fee, address _vault) {
        _clone = address(new MineToken());
        feeSetter = msg.sender;
        fee = _fee;
        vault = _vault;
    }


    function createMinerToken(IMineToken.ConfigInfo calldata _config, IMineToken.TokenInfo calldata _tokenInfo) external {
        
        bytes32 nameHash = keccak256(abi.encodePacked(_tokenInfo.symbol));
        require(_nameCheck[nameHash] == address(0), "");
        require(_config.difficulty > 0, "difficulty min 0x0");

        address token = Clones.clone(_clone);
        IMineToken(token).init(_config, _tokenInfo, msg.sender);
        

        _nameCheck[nameHash] = token;
        _nameList.push(nameHash);

        emit NewToken(token, msg.sender, block.timestamp);
        
    }

    function nameList(uint256 i, uint256 l) public view returns (bytes32[] memory) {
        bytes32[] memory _s = new bytes32[](l);
        uint256 _l = _nameList.length;
        if (_l > l+i) {
            _l = l+i;
        }
        uint256 index;
        for (i; i < _l; i++) {
            // if (_l < i+1) break;
            _s[index] = _nameList[i];
            index++;
        }
        
        return _s;
    }

    function tokenInfoByName(bytes32 _nameHash, address account) external view returns (IMineToken.ConfigInfo memory _config, IMineToken.TokenInfo memory _tokenInfo, IMineToken.CurrentInfo memory _current, IMineToken.MintInfo memory _mintInfo) {
        address token = _nameCheck[_nameHash];
        _current = IMineToken(token).currentInfo();
        _current.token = token;
        _current.minted = IERC20(token).totalSupply();
        return (IMineToken(token).config(), IMineToken(token).tokenInfo(), _current, IMineToken(token).mintInfoOf(account));
    }

    function tokenInfoOf(address token, address account) external view returns (IMineToken.ConfigInfo memory _config, IMineToken.TokenInfo memory _tokenInfo, IMineToken.CurrentInfo memory _current, IMineToken.MintInfo memory _mintInfo) {
        _current = IMineToken(token).currentInfo();
        _current.token = token;
        _current.minted = IERC20(token).totalSupply();
        return (IMineToken(token).config(), IMineToken(token).tokenInfo(), _current, IMineToken(token).mintInfoOf(account));
    }

    function setFeeSetter(address account) external {
        require(feeSetter == msg.sender, "caller is not feeSetter");
        feeSetter = account;
    }

    function setFee(uint256 _fee) external {
        require(feeSetter == msg.sender, "caller is not feeSetter");
        fee = _fee;
    }

    function setVault(address account) external {
        require(feeSetter == msg.sender, "caller is not feeSetter");
        vault = account;
    }
}

contract MineToken is IMineToken, ERC20 {
    ConfigInfo public _config;
    TokenInfo public _tokenInfo;

    address factory;
    
    bytes constant base = bytes("0x0000000000000000000000000000000000000000000000000000000000000000");

    mapping (address => MintInfo) _minted;

    mapping (bytes32 => bool) _hashUsed;

    bool minting;
    bytes32 public nameHash;

    CurrentInfo public _currenInfo;

    constructor() ERC20("", "") {}

    function init(ConfigInfo calldata _c, TokenInfo calldata _t, address sender) external {
        require(factory == address(0), "initialized");
        
        factory = msg.sender;

        _config = _c;
        _tokenInfo = _t;
        minting = true;
        _currenInfo.reward = _config.reward;
        _currenInfo.difficulty = _config.difficulty;

        _currenInfo.fee = IMineFactory(factory).fee();
        _currenInfo.vault = IMineFactory(factory).vault();
        _currenInfo.created = block.timestamp;
        _currenInfo.creater = sender;


        nameHash = keccak256(abi.encodePacked(_tokenInfo.symbol));

        _currenInfo.nextDifficultyBreak = _config.diffStep == 0 ? type(uint256).max : _config.diffStep;
        _currenInfo.nextReduceBreak = _config.reduceStep == 0 ? type(uint256).max :  _config.reduceStep;

    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _tokenInfo.name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _tokenInfo.symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return _tokenInfo.decimals;
    }

    receive() external payable {
        if (address(this).balance > 0) {
            (bool s,) = _currenInfo.vault.call{value: address(this).balance}("");
            require(s, "f");
        }
    }

    fallback() external payable  {
        require(msg.sender == tx.origin, "proxy disabled");
        require(_config.startTimestamp <= block.timestamp, "mint not open");
        MintInfo storage _mintInfo = _minted[msg.sender];
        require(_config.maxLimit == 0|| _mintInfo.round < _config.maxLimit, "account full");
        _mintInfo.round += 1;
        require(msg.value >= _currenInfo.fee, "invalid amount");
        if (address(this).balance > 0) {
            (bool s,) = _currenInfo.vault.call{value: address(this).balance}("");
            require(s, "f");
        }

        (,uint256 chainId,bytes32 tokenSymbol,address account) = abi.decode(msg.data, (bytes32, uint256, bytes32, address));
        bytes32 hash = keccak256(msg.data);
        require(account == msg.sender && tokenSymbol == nameHash && chainId == block.chainid && !_hashUsed[hash], "invalid hash");
        bytes memory valid = bytes(string(abi.encodePacked("0x", _toHex16(bytes16(hash)))));
        for (uint256 i = 2; i < _currenInfo.difficulty+2; i++) {
            if (base[i] != valid[i]) {
                revert("expiration difficulty");
            }
        }
        _hashUsed[hash] = true;
        require(minting, "mint full");
        if (totalSupply() + _currenInfo.reward >= _tokenInfo.maxSupply) {
            minting = false;
            _mint(msg.sender, _tokenInfo.maxSupply - totalSupply());
        } else {
             _mint(msg.sender, _currenInfo.reward);
        }
       
    }

    function config() external view returns (ConfigInfo memory) {
        return _config;
    }

    function tokenInfo() external view returns (TokenInfo memory) {
        return _tokenInfo;
    }

    function currentInfo() external view returns (CurrentInfo memory) {
        return _currenInfo;
    }

    function mintInfoOf(address account) external view returns (MintInfo memory) {
        return _minted[account];
    }

    
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
        // require(!minting || from == address(0), "minting");
        
        super._beforeTokenTransfer(from, to, amount);
    }
      
    
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual override {
        super._afterTokenTransfer(from, to, amount);

        if (_config.diffStep > 0 && _currenInfo.difficulty < _config.maxDifficulty && totalSupply() > _currenInfo.nextDifficultyBreak) {
            _currenInfo.nextDifficultyBreak += _config.diffStep;
            _currenInfo.difficulty += 1;
            _currenInfo.diffBlock = block.number;
        }

        if (_config.reduceStep > 0 && totalSupply() > _currenInfo.nextReduceBreak) {
            _currenInfo.nextReduceBreak += _config.reduceStep;
            _currenInfo.reward = _currenInfo.reward * (1000 - _config.reduce) / 1000;
            _currenInfo.reduceBlock = block.number;
        }
    }

    function _toHex16 (bytes16 data) internal pure returns (bytes32 result) {
        result = bytes32 (data) & 0xFFFFFFFFFFFFFFFF000000000000000000000000000000000000000000000000 |
            (bytes32 (data) & 0x0000000000000000FFFFFFFFFFFFFFFF00000000000000000000000000000000) >> 64;
        result = result & 0xFFFFFFFF000000000000000000000000FFFFFFFF000000000000000000000000 |
            (result & 0x00000000FFFFFFFF000000000000000000000000FFFFFFFF0000000000000000) >> 32;
        result = result & 0xFFFF000000000000FFFF000000000000FFFF000000000000FFFF000000000000 |
            (result & 0x0000FFFF000000000000FFFF000000000000FFFF000000000000FFFF00000000) >> 16;
        result = result & 0xFF000000FF000000FF000000FF000000FF000000FF000000FF000000FF000000 |
            (result & 0x00FF000000FF000000FF000000FF000000FF000000FF000000FF000000FF0000) >> 8;
        result = (result & 0xF000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000) >> 4 |
            (result & 0x0F000F000F000F000F000F000F000F000F000F000F000F000F000F000F000F00) >> 8;
        result = bytes32 (0x3030303030303030303030303030303030303030303030303030303030303030 +
            uint256 (result) +
            (uint256 (result) + 0x0606060606060606060606060606060606060606060606060606060606060606 >> 4 &
            0x0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F) * 39);
    }
    
}