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// 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
/// @author 0xLumos-Labs
/// @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 {
	using SafeERC20 for IERC20;
	/* ======== STORAGE ======== */

	uint256 public SUPERIOR_REFERRER_SHARE_BPS;

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

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

	constructor(uint256 _superiorReferrerShareBps) Ownable(msg.sender) {
		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 {
		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 {
		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).safeTransferFrom(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
	) public {
		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) {
		uint referralRewards = getReferrerRewards(msg.sender, token);

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

		address superior = getSuperiorReferrer(msg.sender);

		_makeReferralRewards0(token, msg.sender);

		uint256 superiorReferrerReward = _addRewardToSuperiorReferrer(
			token,
			referralRewards,
			superior
		);

		uint256 amountToWithdraw = referralRewards - superiorReferrerReward;

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

		emit ReferralRewardWithdrawn(msg.sender, 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);
	}

	/* ======== 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
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (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) (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/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
// 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
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));
	}
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ts":[{"internalType":"string","name":"referralCode","type":"string"}],"name":"getReferrerByReferralCode","outputs":[{"internalType":"address","name":"referrer","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"referralCodeHash","type":"bytes32"}],"name":"getReferrerByReferralCodeHash","outputs":[{"internalType":"address","name":"referrer","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"referrer","type":"address"},{"internalType":"address","name":"token","type":"address"}],"name":"getReferrerRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"referrer","type":"address"}],"name":"getSuperiorReferrer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"referralCodeHash","type":"bytes32"}],"name":"isReferralCodeAvailable","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"referralCodeHash","type":"bytes32"}],"name":"isReferralCodeExist","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"referral","type":"address"},{"internalType":"bytes32","name":"referralCodeHash","type":"bytes32"}],"name":"registerReferral","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"referralCode","type":"string"},{"internalType":"address","name":"referrer","type":"address"},{"internalType":"bytes32","name":"superiorReferralCodeHash","type":"bytes32"}],"name":"registerReferralCode","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newSuperiorReferrerShareBps","type":"uint256"}],"name":"updateReferralRewardShare","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"withdrawReferralRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000000000000000000000000000000000000000000bb8

-----Decoded View---------------
Arg [0] : _superiorReferrerShareBps (uint256): 3000

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000bb8