// 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 v5.0.1) (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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * 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.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => 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 returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual 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 `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` 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 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        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 `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` 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.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` 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.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated 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
pragma solidity 0.8.20;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "./ReferralSystemStorage.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/// @notice ReferralSystem contract is a contract that allows to create a referral codes and collect referral rewards
/// @dev allows infinite nesting of referrals due to design of the contract of referrers being able to have referrers
/// @dev superior referrer is a referrer that invited another referrer
/// @dev inferior referrer is a referrer that have been invited by some referrer
/// @dev creator of referral code can be a first referrer ever existed, than he will never pay referral fees to his superior referrer
contract ReferralSystem is ReferralSystemStorage, Ownable {
    /* ======== STORAGE ======== */

    uint256 public SUPERIOR_REFERRER_SHARE_BPS;

    mapping(bytes32 codeHash => string code) private codeByHash;

    /* ======== CONSTRUCTOR ======== */

    constructor(
        uint256 _superiorReferrerShareBps,
        address _owner
    ) Ownable(_owner) {
        SUPERIOR_REFERRER_SHARE_BPS = _superiorReferrerShareBps;
    }

    /* ======== ERRORS ======== */

    error InvalidReferralCodeLength();
    error ReferralCodeUnavailable();
    error ReferralCodeNotExist();
    error NoRewardAccruedForReferrer();
    error ZeroAmountPassed();

    /* ======== EVENTS ======== */

    event ReferralCodeRegistered(
        string referralCode,
        bytes32 indexed referralCodeHash,
        address indexed referrer,
        bytes32 indexed superiorReferralCodeHash
    );

    event ReferralRewardAccrued(
        address indexed token,
        uint256 reward,
        address indexed referrer,
        bytes32 referralCodeHash
    );

    event ReferralRegisteredWithReferralCode(
        address indexed referral,
        bytes32 indexed referralCodeHash
    );

    event ReferralRewardWithdrawn(
        address indexed referrer,
        address indexed token,
        uint256 reward
    );

    event ReferralRewardShareUpdated(uint256 newReferrerShareBps);

    /* ======== MUTABLE FUNCTIONS ======== */

    /// @notice new referrer can be registered with a referral code of another referrer
    /// @notice meaning that the new referrer will be a referral of the referrer and will share a reward with referrer
    function registerReferralCode(
        string calldata referralCode,
        address referrer,
        bytes32 superiorReferralCodeHash
    ) public onlyOwner {
        bytes32 referralCodeHash = getReferralCodeHash(referralCode);

        if (!isReferralCodeAvailable(referralCodeHash))
            revert ReferralCodeUnavailable();

        if (bytes(referralCode).length == 0) revert InvalidReferralCodeLength();
        if (
            superiorReferralCodeHash != bytes32(0) &&
            !isReferralCodeExist(superiorReferralCodeHash)
        ) revert ReferralCodeNotExist();

        _saveReferralCode(referralCode);

        _setReferralCodeData(referralCode, referrer, superiorReferralCodeHash);

        emit ReferralCodeRegistered(
            referralCode,
            referralCodeHash,
            referrer,
            superiorReferralCodeHash
        );
    }

    function registerReferral(
        address referral,
        bytes32 referralCodeHash
    ) public onlyOwner {
        if (!isReferralCodeExist(referralCodeHash))
            revert ReferralCodeNotExist();

        _setReferralCodeToAddress(referral, referralCodeHash);

        emit ReferralRegisteredWithReferralCode(referral, referralCodeHash);
    }

    function accrueNativeReferralReward(
        bytes32 referralCodeHash
    ) public payable {
        address referrer = getReferrerByReferralCodeHash(referralCodeHash);

        _accrueReferralReward(
            address(0),
            msg.value,
            referrer,
            referralCodeHash
        );
    }

    function accrueTokenReferralReward(
        address token,
        uint amount,
        bytes32 referralCodeHash
    ) public {
        address referrer = getReferrerByReferralCodeHash(referralCodeHash);

        IERC20(token).transferFrom(msg.sender, address(this), amount);

        _accrueReferralReward(token, amount, referrer, referralCodeHash);
    }

    /// @dev don't do checks on token
    /// @dev address(0) - rewards in native
    /// @dev a
    function _accrueReferralReward(
        address token,
        uint amount,
        address referrer,
        bytes32 referralCodeHash
    ) internal {
        if (referrer == address(0)) revert ReferrerNotExist();

        _addRewardsToReferrer(token, amount, referrer);

        emit ReferralRewardAccrued(token, amount, referrer, referralCodeHash);
    }

    /// @param token address of the token to withdraw rewards for (zero address is native currency)
    function withdrawReferralRewards(address token) public returns (uint) {
        return _withdrawReferralRewards(token, msg.sender);
    }

    function _withdrawReferralRewards(
        address token,
        address referrer
    ) internal returns (uint) {
        uint referralRewards = getReferrerRewards(referrer, token);

        if (referralRewards == 0) revert NoRewardAccruedForReferrer();

        _makeReferralRewards0(token, referrer);

        uint256 superiorReferrerReward = _addRewardToSuperiorReferrer(
            token,
            referralRewards,
            getSuperiorReferrer(referrer)
        );

        uint256 amountToWithdraw = referralRewards - superiorReferrerReward;

        if (token == address(0)) {
            payable(referrer).transfer(amountToWithdraw);
        } else {
            IERC20(token).transfer(referrer, amountToWithdraw);
        }

        emit ReferralRewardWithdrawn(referrer, token, amountToWithdraw);

        return amountToWithdraw;
    }

    function _addRewardToSuperiorReferrer(
        address token,
        uint inferiorReward,
        address superior
    ) internal returns (uint256 superiorReferrerReward) {
        if (superior == address(0)) {
            return 0;
        }

        superiorReferrerReward = calcSuperiorReferrersShare(inferiorReward);

        _addRewardsToReferrer(token, superiorReferrerReward, superior);

        bytes32 inferiorReferralCodeHash = getReferralCodeHashByReferral(
            msg.sender
        );

        emit ReferralRewardAccrued(
            token,
            superiorReferrerReward,
            superior,
            inferiorReferralCodeHash
        );
    }

    function _saveReferralCode(string calldata referralCode) internal {}

    /* ======== RESTRICTED FUNCTIONS ======== */

    function updateReferralRewardShare(
        uint256 newSuperiorReferrerShareBps
    ) public onlyOwner {
        SUPERIOR_REFERRER_SHARE_BPS = newSuperiorReferrerShareBps;

        emit ReferralRewardShareUpdated(newSuperiorReferrerShareBps);
    }

    /// @param token address of the token to withdraw rewards for (zero address is native currency)
    function withdrawReferralRewardsOnBehalfOf(
        address token,
        address referrer
    ) public onlyOwner returns (uint) {
        return _withdrawReferralRewards(token, referrer);
    }

    /* ======== VIEW FUNCTIONS ======== */

    function calcSuperiorReferrersShare(
        uint256 amount
    ) public view returns (uint256) {
        return (amount * SUPERIOR_REFERRER_SHARE_BPS) / 10000;
    }

    function isReferralCodeAvailable(
        bytes32 referralCodeHash
    ) public view returns (bool) {
        return getReferrerByReferralCodeHash(referralCodeHash) == address(0);
    }

    function isReferralCodeExist(
        bytes32 referralCodeHash
    ) public view returns (bool) {
        return getReferrerByReferralCodeHash(referralCodeHash) != address(0);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

contract ReferralSystemStorage {
    /* ======== DATA TYPES ======== */

    struct ReferrerData {
        // address(0) is native currency
        mapping(address => uint256) referralRewards;
        address superiorReferrer;
    }

    mapping(address referrer => ReferrerData) private referrerData;
    mapping(address referral => bytes32 referralCodeHash)
        private codeByReferral;

    mapping(bytes32 referralCodeHash => string referralCode) private codeByHash;
    //     private superiorReferrer;

    /* ======== ERRORS ======== */

    error ReferrerNotExist();
    error ZeroAddressPassed();
    error ZeroReferralCodeHashPassed();
    error ZeroRewardPassed();

    /* ======== STORAGE ======== */

    mapping(bytes32 referralCodeHash => address referrer)
        private referrerByReferralCodeHash;

    /* ======== MUTABLE FUNCTIONS ======== */

    function _setReferralCodeData(
        string calldata referralCode,
        address referrer,
        bytes32 superiorReferralCodeHash
    ) internal {
        bytes32 referralCodeHash = getReferralCodeHash(referralCode);
        codeByHash[referralCodeHash] = referralCode;

        if (referrer == address(0)) revert ZeroAddressPassed();
        if (referralCodeHash == bytes32(0x0))
            revert ZeroReferralCodeHashPassed();

        referrerByReferralCodeHash[referralCodeHash] = referrer;

        address _superiorReferrer = getReferrerByReferralCodeHash(
            superiorReferralCodeHash
        );

        referrerData[referrer].superiorReferrer = _superiorReferrer;
    }

    function _setReferralCodeToAddress(
        address referral,
        bytes32 referralCodeHash
    ) internal {
        if (referral == address(0)) revert ZeroAddressPassed();
        if (referralCodeHash == bytes32(0x0))
            revert ZeroReferralCodeHashPassed();
        codeByReferral[referral] = referralCodeHash;
    }

    function _addRewardsToReferrer(
        address token,
        uint256 reward,
        address referrer
    ) internal {
        if (reward == 0) revert ZeroRewardPassed();
        if (referrer == address(0)) revert ZeroAddressPassed();

        referrerData[referrer].referralRewards[token] += reward;
    }

    function _makeReferralRewards0(address token, address referrer) internal {
        referrerData[referrer].referralRewards[token] = 0;
    }

    /* ======== VIEW FUNCTIONS ======== */

    function getReferrerByReferralCode(
        string calldata referralCode
    ) public view returns (address referrer) {
        bytes32 referralCodeHash = keccak256(abi.encodePacked(referralCode));
        referrer = referrerByReferralCodeHash[referralCodeHash];

        if (referrer == address(0)) revert ReferrerNotExist();
    }

    function getReferrerByReferralCodeHash(
        bytes32 referralCodeHash
    ) public view returns (address referrer) {
        referrer = referrerByReferralCodeHash[referralCodeHash];

        // if (referrer == address(0)) revert ReferrerNotExist(referralCodeHash);
    }

    function getReferrerRewards(
        address referrer,
        address token
    ) public view returns (uint) {
        return referrerData[referrer].referralRewards[token];
    }

    function getSuperiorReferrer(
        address referrer
    ) public view returns (address) {
        return referrerData[referrer].superiorReferrer;
    }

    function getReferralCodeHashByReferral(
        address referral
    ) public view returns (bytes32 referralCodeHash) {
        referralCodeHash = codeByReferral[referral];
    }

    function getReferralCodeByHash(
        bytes32 referralCodeHash
    ) public view returns (string memory referralCode) {
        referralCode = codeByHash[referralCodeHash];
    }

    function getReferralCodeHash(
        string calldata code
    ) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(code));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../utils/Address.sol";

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

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

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

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

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

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

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

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

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

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

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

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

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./ReferralSystem.sol";

/// @title A contract for token sale including time constraints
/// @notice This contract allows for the sale and purchase of tokens within a specified time frame
contract TokenSale is Ownable {
    struct PurchaseInfo {
        uint amount;
        uint tokensPurchased;
    }

    struct Stage {
        uint128 deadline;
        uint128 conversionRate;
    }

    /* ====== SALE PARAMS ====== */
    ERC20 public USDT;

    uint public totalDeposit;

    Stage[] public stages;

    uint32 public saleStartTime;

    uint32 public tokenDecimals = 18;
    uint32 public USDTdecimals;

    uint32 BP = 100; // Basis Points

    /* ====== REFERRAL PARAMS ====== */

    ReferralSystem public referralSystem;
    uint public referralBonusPercent; // bonus of n% of tokens purchased
    uint public referralFeePercent;

    event ReferralBuy(bytes32 referralCode);

    mapping(address => PurchaseInfo) public userPurchases;

    event Purchase(
        address indexed buyer,
        uint amount,
        uint tokensPurchased,
        bytes purchase_data
    );

    constructor(
        address _usdt,
        Stage[] memory _stages,
        uint32 _saleStartTime,
        address _referralSystem,
        uint _referralFeePercent,
        uint _referralBonusPercent,
        address _owner
    ) Ownable(_owner) {
        require(
            _usdt != address(0),
            "TokenSale: USDT address cannot be the zero address"
        );

        for (uint i = 0; i < _stages.length - 1; i++) {
            require(
                _stages[i].deadline < _stages[i + 1].deadline &&
                    _saleStartTime < _stages[i].deadline,
                "TokenSale: Stages must be in ascending order"
            );

            stages.push(_stages[i]);
        }
        //add because loop ends at length - 1
        stages.push(_stages[_stages.length - 1]);

        require(
            _saleStartTime < _stages[0].deadline,
            "TokenSale: Incorrect sale start time must be in ascending order"
        );

        saleStartTime = _saleStartTime;

        USDT = ERC20(_usdt);
        USDTdecimals = USDT.decimals();

        referralSystem = ReferralSystem(_referralSystem);
        referralFeePercent = _referralFeePercent;
        referralBonusPercent = _referralBonusPercent;
    }

    /// @param amount The amount of USDT to spend
    /// @param referralCodeHash The hash of the referral code. Zero Hash is passed if no referral code is used
    function buy(
        uint amount,
        bytes calldata purchase_data,
        bytes32 referralCodeHash
    ) external {
        if (amount == 0) revert("TokenSale: Amount must be greater than 0");

        require(
            block.timestamp >= saleStartTime,
            "TokenSale: Sale is not active"
        );

        USDT.transferFrom(msg.sender, address(this), amount);

        bool isReferral = _tryToUseReferralStatus(
            amount,
            msg.sender,
            referralCodeHash
        );

        uint currentStage = getCurrentStage();
        uint deadline = stages[currentStage].deadline;
        require(
            block.timestamp < deadline,
            "TokenSale: Sale has ended for this stage"
        );

        totalDeposit += amount;

        userPurchases[msg.sender].amount += amount;
        uint tokensPurchased = getTokensPurchased(amount, isReferral);
        userPurchases[msg.sender].tokensPurchased += tokensPurchased;

        emit Purchase(msg.sender, amount, tokensPurchased, purchase_data);
    }

    function _tryToUseReferralStatus(
        uint buyAmount,
        address referral,
        bytes32 referralCode
    ) internal returns (bool success) {
        bytes32 registeredReferralCode = referralSystem
            .getReferralCodeHashByReferral(referral);

        if (registeredReferralCode != bytes32(0)) {
            _sendReferralFeeOfAmount(buyAmount, registeredReferralCode);

            emit ReferralBuy(referralCode);

            return true;
        }

        if (referralCode == bytes32(0)) {
            return false;
        }

        referralSystem.registerReferral(referral, referralCode);
        _sendReferralFeeOfAmount(buyAmount, referralCode);

        emit ReferralBuy(referralCode);

        return true;
    }

    function _sendReferralFeeOfAmount(
        uint buyAmount,
        bytes32 referralCode
    ) internal {
        uint fee = (buyAmount * referralFeePercent) / BP;
        USDT.approve(address(referralSystem), fee);

        referralSystem.accrueTokenReferralReward(
            address(USDT),
            fee,
            referralCode
        );
    }

    function _clearStages() internal {
        for (uint i = 0; i < stages.length; i++) {
            delete stages[i];
        }
    }

    /* ====== ADMIN FUNCTIONS ====== */

    function setStages(Stage[] calldata _stages) external onlyOwner {
        _clearStages();
        for (uint i = 0; i < stages.length - 1; i++) {
            require(
                _stages[i].deadline < _stages[i + 1].deadline,
                "TokenSale: Stages must be in ascending order"
            );

            stages.push(_stages[i]);
        }
    }

    function setSaleStartTime(uint32 _saleStartTime) external onlyOwner {
        saleStartTime = _saleStartTime;
    }

    function withdraw(uint amount) external onlyOwner {
        USDT.transfer(owner(), amount);
    }

    /* ====== VIEW FUNCTIONS ====== */
    function getStages() public view returns (Stage[] memory) {
        return stages;
    }

    function getCurrentStage() public view returns (uint) {
        uint currentTime = block.timestamp;

        for (uint i = 0; i < stages.length; i++) {
            if (currentTime < stages[i].deadline) {
                return i;
            }
        }

        return stages.length - 1;
    }

    function getTokensPurchased(
        uint amount,
        bool isReferral
    ) public view returns (uint) {
        uint currentStage = getCurrentStage();
        uint conversionRate = stages[currentStage].conversionRate;

        uint tokensPurchased = convertUSDTToTokens(amount, conversionRate);

        uint _referralBonus = calculateReferralBonus(
            tokensPurchased,
            isReferral
        );

        return tokensPurchased + _referralBonus;
    }

    function convertUSDTToTokens(
        uint amount,
        uint conversionRate
    ) public view returns (uint) {
        return
            ((amount * conversionRate) * 10 ** (tokenDecimals - USDTdecimals)) /
            BP;
    }

    function calculateReferralBonus(
        uint tokensPurchased,
        bool isReferral
    ) public view returns (uint) {
        if (!isReferral) return 0;

        return (tokensPurchased * referralBonusPercent) / BP;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

{
  "compilationTarget": {
    "contracts/Tokensale.sol": "TokenSale"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":@bb-referral/=black-bunny-referral-sc/contracts/",
    ":@layerzerolabs/=node_modules/@layerzerolabs/",
    ":@openzeppelin/=node_modules/@openzeppelin/",
    ":@uniswap/=node_modules/@uniswap/",
    ":base64-sol/=node_modules/base64-sol/",
    ":contracts/=contracts/",
    ":eth-gas-reporter/=node_modules/eth-gas-reporter/",
    ":forge-std/=lib/forge-std/src/",
    ":hardhat-deploy/=node_modules/hardhat-deploy/",
    ":hardhat/=node_modules/hardhat/",
    ":solmate/=node_modules/solmate/"
  ]
}