// File: contracts/factories/FeeSettingsCloneFactory.sol



// SPDX-License-Identifier: AGPL-3.0-only

pragma solidity 0.8.23;

import "../FeeSettings.sol";
import "./CloneFactory.sol";

/**
 * @title FeeSettingsCloneFactory
 * @author malteish
 * @notice Create clones of a FeeSettings contract with deterministic addresses
 */
contract FeeSettingsCloneFactory is CloneFactory {
    constructor(address _implementation) CloneFactory(_implementation) {}

    /**
     * Create a clone
     * @param _rawSalt this value influences the address of the clone, but not the initialization
     * @param _trustedForwarder the trusted forwarder (ERC2771) can not be changed, but is checked for security
     * @param _owner address that will own the new clone
     * @param _fees struct that contains the fee schedule for the clone
     * @param _tokenFeeCollector address that will receive the fees for token creation
     * @param _crowdinvestingFeeCollector address that will receive the fees for crowdinvesting
     * @param _privateOfferFeeCollector address that will receive the fees for private offers
     * @return address of the new clone
     */
    function createFeeSettingsClone(
        bytes32 _rawSalt,
        address _trustedForwarder,
        address _owner,
        Fees memory _fees,
        address _tokenFeeCollector,
        address _crowdinvestingFeeCollector,
        address _privateOfferFeeCollector
    ) external returns (address) {
        bytes32 salt = _generateSalt(
            _rawSalt,
            _trustedForwarder,
            _owner,
            _fees,
            _tokenFeeCollector,
            _crowdinvestingFeeCollector,
            _privateOfferFeeCollector
        );
        address clone = Clones.cloneDeterministic(implementation, salt);
        FeeSettings cloneFeeSettings = FeeSettings(clone);
        require(
            cloneFeeSettings.isTrustedForwarder(_trustedForwarder),
            "FeeSettingsCloneFactory: Unexpected trustedForwarder"
        );
        cloneFeeSettings.initialize(
            _owner,
            _fees,
            _tokenFeeCollector,
            _crowdinvestingFeeCollector,
            _privateOfferFeeCollector
        );
        emit NewClone(clone);
        return clone;
    }

    /**
     * Return the address a clone would have if it was created with these parameters.
     * @param _rawSalt this value influences the address of the clone, but not the initialization
     * @param _trustedForwarder the trusted forwarder (ERC2771) can not be changed, but is checked for security
     * @param _owner address that will own the new clone
     * @param _fees struct that contains the fee schedule for the clone
     * @param _tokenFeeCollector address that will receive the fees for token creation
     * @param _crowdinvestingFeeCollector address that will receive the fees for crowdinvesting
     * @param _privateOfferFeeCollector address that will receive the fees for private offers
     * @return address of the new clone
     */
    function predictCloneAddress(
        bytes32 _rawSalt,
        address _trustedForwarder,
        address _owner,
        Fees memory _fees,
        address _tokenFeeCollector,
        address _crowdinvestingFeeCollector,
        address _privateOfferFeeCollector
    ) external view returns (address) {
        bytes32 salt = _generateSalt(
            _rawSalt,
            _trustedForwarder,
            _owner,
            _fees,
            _tokenFeeCollector,
            _crowdinvestingFeeCollector,
            _privateOfferFeeCollector
        );
        return Clones.predictDeterministicAddress(implementation, salt);
    }

    /**
     * Generate a single salt from all input parameters
     * @param _rawSalt this value influences the address of the clone, but not the initialization
     * @param _trustedForwarder the trusted forwarder (ERC2771) can not be changed, but is checked for security
     * @param _owner address that will own the new clone
     * @param _fees struct that contains the fee schedule for the clone
     * @param _tokenFeeCollector address that will receive the fees for token creation
     * @param _crowdinvestingFeeCollector address that will receive the fees for crowdinvesting
     * @param _privateOfferFeeCollector address that will receive the fees for private offers
     * @return salt
     */
    function _generateSalt(
        bytes32 _rawSalt,
        address _trustedForwarder,
        address _owner,
        Fees memory _fees,
        address _tokenFeeCollector,
        address _crowdinvestingFeeCollector,
        address _privateOfferFeeCollector
    ) internal pure returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    _rawSalt,
                    _trustedForwarder,
                    _owner,
                    _fees,
                    _tokenFeeCollector,
                    _crowdinvestingFeeCollector,
                    _privateOfferFeeCollector
                )
            );
    }
}

// File: contracts/FeeSettings.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.23;

import "@openzeppelin/contracts-upgradeable/access/Ownable2StepUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/metatx/ERC2771ContextUpgradeable.sol";

import "./interfaces/IFeeSettings.sol";

/**
 * @title FeeSettings
 * @author malteish, cjentzsch
 * @notice The FeeSettings contract is used to manage fees paid to the tokenize.it platfom
 */
contract FeeSettings is
    Ownable2StepUpgradeable,
    ERC165Upgradeable,
    ERC2771ContextUpgradeable,
    IFeeSettingsV2,
    IFeeSettingsV1
{
    /// max token fee is 5%
    uint32 public constant MAX_TOKEN_FEE_NUMERATOR = 500;
    /// max crowdinvesting fee is 10%
    uint32 public constant MAX_CROWDINVESTING_FEE_NUMERATOR = 1000;
    /// max private offer fee is 5%
    uint32 public constant MAX_PRIVATE_OFFER_FEE_NUMERATOR = 500;

    /// Denominator to calculate all fees
    uint32 public constant FEE_DENOMINATOR = 10000;

    /**
     * special fees for specific customers. If a customer has a custom fee, the custom
     * fee is used instead of the default fee.
     * Custom fees can only reduce the fee, not increase it.
     * The key is the customer's token address, e.g. customers are identified by their token.
     * The `time` field is the time up to which the custom fee is valid.
     * Afterwards, standard fees are used.
     */
    mapping(address => Fees) public fees;

    /**
     * if `tokenFeeCollectors[tokenAddress]` is 0x0, the fees must be paid to `tokenFeeCollectors[address(0)]`
     * otherwise, the fees must be paid to `tokenFeeCollectors[tokenAddress]`
     */
    mapping(address => address) public tokenFeeCollectors;
    /**
     * if `crowdinvestingFeeCollectors[tokenAddress]` is 0x0, the fees must be paid to `crowdinvestingFeeCollectors[address(0)]`
     * otherwise, the fees must be paid to `crowdinvestingFeeCollectors[tokenAddress]`
     */
    mapping(address => address) public crowdinvestingFeeCollectors;
    /**
     * if `privateOfferFeeCollectors[tokenAddress]` is 0x0, the fees must be paid to `privateOfferFeeCollectors[address(0)]`
     * otherwise, the fees must be paid to `privateOfferFeeCollectors[tokenAddress]`
     */
    mapping(address => address) public privateOfferFeeCollectors;

    /// new fee settings that can be activated (after a delay in case of fee increase)
    Fees public proposedDefaultFees;

    /// stores who is a manager. Managers can change fees and fee collectors for specific tokens
    mapping(address => bool) public managers;

    /**
     * @notice Default fees have been changed
     * @param tokenFeeNumerator a in fraction a/b that defines the fee paid in Token: fee = amount * a / b
     * @param crowdinvestingFeeNumerator a in fraction a/b that defines the fee paid in currency for crowdinvesting: fee = amount * a / b
     * @param privateOfferFeeNumerator a in fraction a/b that defines the fee paid in currency for private offers: fee = amount * a / b
     */
    event SetFee(uint32 tokenFeeNumerator, uint32 crowdinvestingFeeNumerator, uint32 privateOfferFeeNumerator);

    /**
     * @notice Default fees have been changed
     * @param tokenFeeNumerator a in fraction a/b that defines the fee paid in Token: fee = amount * a / b
     * @param crowdinvestingFeeNumerator a in fraction a/b that defines the fee paid in currency for crowdinvesting: fee = amount * a / b
     * @param privateOfferFeeNumerator a in fraction a/b that defines the fee paid in currency for private offers: fee = amount * a / b
     * @param time The time when the custom fee expires
     */
    event SetCustomFee(
        address indexed token,
        uint32 tokenFeeNumerator,
        uint32 crowdinvestingFeeNumerator,
        uint32 privateOfferFeeNumerator,
        uint256 time
    );

    /// custom fee settings for the given token have been removed
    event RemoveCustomFee(address indexed token);

    /// token fees for `token` must now be paid to `feeCollector`
    event SetCustomTokenFeeCollector(address indexed token, address indexed feeCollector);
    /// crowdinvesting fees for `token` must now be paid to `feeCollector`
    event SetCustomCrowdinvestingFeeCollector(address indexed token, address indexed feeCollector);
    /// private offer fees for `token` must now be paid to `feeCollector`
    event SetCustomPrivateOfferFeeCollector(address indexed token, address indexed feeCollector);

    /// token fees for `token` must now be paid to the default fee collector
    event RemoveCustomTokenFeeCollector(address indexed token);
    /// crowdinvesting fees for `token` must now be paid to the default fee collector
    event RemoveCustomCrowdinvestingFeeCollector(address indexed token);
    /// private offer fees for `token` must now be paid to the default fee collector
    event RemoveCustomPrivateOfferFeeCollector(address indexed token);

    /**
     * @notice The fee collectors have changed
     * @param newTokenFeeCollector The new fee collector for token fees
     * @param newCrowdinvestingFeeCollector The new fee collector for crowdinvesting fees
     * @param newPrivateOfferFeeCollector The new fee collector for private offer fees
     */
    event FeeCollectorsChanged(
        address indexed newTokenFeeCollector,
        address indexed newCrowdinvestingFeeCollector,
        address indexed newPrivateOfferFeeCollector
    );

    /**
     * @notice A fee change has been proposed
     * @param proposal The new fee settings that have been proposed
     */
    event ChangeProposed(Fees proposal);

    /**
     * This constructor deploys a logic contract with no owner, that can be used for cloning.
     * @param _trustedForwarder The trusted forwarder contract to use
     */
    constructor(address _trustedForwarder) ERC2771ContextUpgradeable(_trustedForwarder) {
        _disableInitializers();
    }

    /**
     * @notice Initializes the contract with the given fee denominators and fee collector
     * @param _fees The initial fee denominators
     * @param _tokenFeeCollector The initial fee collector
     * @param _crowdinvestingFeeCollector The initial crowdinvesting fee collector
     * @param _privateOfferFeeCollector The initial private offer fee collector
     */
    function initialize(
        address _owner,
        Fees memory _fees,
        address _tokenFeeCollector,
        address _crowdinvestingFeeCollector,
        address _privateOfferFeeCollector
    ) external initializer {
        require(_owner != address(0), "owner can not be zero address");
        managers[_owner] = true;
        _transferOwnership(_owner);

        checkFeeLimits(_fees);
        fees[address(0)] = _fees;

        require(_tokenFeeCollector != address(0), "Fee collector cannot be 0x0");
        tokenFeeCollectors[address(0)] = _tokenFeeCollector;

        require(_crowdinvestingFeeCollector != address(0), "Fee collector cannot be 0x0");
        crowdinvestingFeeCollectors[address(0)] = _crowdinvestingFeeCollector;

        require(_privateOfferFeeCollector != address(0), "Fee collector cannot be 0x0");
        privateOfferFeeCollectors[address(0)] = _privateOfferFeeCollector;
    }

    /**
     * @notice Adds a manager
     * @param _manager The manager to add
     */
    function addManager(address _manager) external onlyOwner {
        managers[_manager] = true;
    }

    /**
     * @notice Removes a manager
     * @param _manager The manager to remove
     */
    function removeManager(address _manager) external onlyOwner {
        delete managers[_manager];
    }

    /**
     * @notice Prepares a fee change. Fee increases are subject to a minimum delay of 12 weeks, while fee reductions can be executed immediately.
     * @dev reducing fees = increasing the denominator
     * @param _fees The new fee denominators
     */
    function planFeeChange(Fees memory _fees) external onlyOwner {
        checkFeeLimits(_fees);

        // if at least one fee increases, enforce minimum delay
        if (
            _fees.tokenFeeNumerator > fees[address(0)].tokenFeeNumerator ||
            _fees.crowdinvestingFeeNumerator > fees[address(0)].crowdinvestingFeeNumerator ||
            _fees.privateOfferFeeNumerator > fees[address(0)].privateOfferFeeNumerator
        ) {
            require(
                _fees.validityDate > block.timestamp + 12 weeks,
                "Fee change must be at least 12 weeks in the future"
            );
        }
        proposedDefaultFees = _fees;
        emit ChangeProposed(_fees);
    }

    /**
     * @notice Executes a fee change that has been planned before
     */
    function executeFeeChange() external onlyOwner {
        require(
            block.timestamp >= proposedDefaultFees.validityDate,
            "Fee change must be executed after the change time"
        );
        fees[address(0)] = proposedDefaultFees;
        emit SetFee(
            proposedDefaultFees.tokenFeeNumerator,
            proposedDefaultFees.crowdinvestingFeeNumerator,
            proposedDefaultFees.privateOfferFeeNumerator
        );
        delete proposedDefaultFees;
    }

    /**
     * @notice Sets a new fee collector
     * @param _tokenFeeCollector The new fee collector
     */
    function setFeeCollectors(
        address _tokenFeeCollector,
        address _crowdinvestingFeeCollector,
        address _personalOfferFeeCollector
    ) external onlyOwner {
        require(_tokenFeeCollector != address(0), "Fee collector cannot be 0x0");
        tokenFeeCollectors[address(0)] = _tokenFeeCollector;
        require(_crowdinvestingFeeCollector != address(0), "Fee collector cannot be 0x0");
        crowdinvestingFeeCollectors[address(0)] = _crowdinvestingFeeCollector;
        require(_personalOfferFeeCollector != address(0), "Fee collector cannot be 0x0");
        privateOfferFeeCollectors[address(0)] = _personalOfferFeeCollector;
        emit FeeCollectorsChanged(_tokenFeeCollector, _crowdinvestingFeeCollector, _personalOfferFeeCollector);
    }

    /**
     * @notice Checks if the given fee settings are valid
     * @param _fees The fees to check
     */
    function checkFeeLimits(Fees memory _fees) internal pure {
        require(_fees.tokenFeeNumerator <= MAX_TOKEN_FEE_NUMERATOR, "Token fee must be <= 5%");
        require(
            _fees.crowdinvestingFeeNumerator <= MAX_CROWDINVESTING_FEE_NUMERATOR,
            "Crowdinvesting fee must be <= 10%"
        );
        require(_fees.privateOfferFeeNumerator <= MAX_PRIVATE_OFFER_FEE_NUMERATOR, "PrivateOffer fee must be <= 5%");
    }

    /**
     * @notice Sets a custom fee for a specific token
     * @param _token The token for which the custom fee should be set
     * @param _fees The custom fee
     */
    function setCustomFee(address _token, Fees memory _fees) external onlyManager {
        checkFeeLimits(_fees);
        require(_token != address(0), "Token cannot be 0x0");
        require(_fees.validityDate > block.timestamp, "Custom fee expiry time must be in the future");
        fees[_token] = _fees;
        emit SetCustomFee(
            _token,
            _fees.tokenFeeNumerator,
            _fees.crowdinvestingFeeNumerator,
            _fees.privateOfferFeeNumerator,
            _fees.validityDate
        );
    }

    /**
     * @notice removes a custom fee entry for a specific token
     * @param _token The token for which the custom fee should be removed
     */
    function removeCustomFee(address _token) external onlyManager {
        require(_token != address(0), "Token cannot be 0x0");
        delete fees[_token];
        emit RemoveCustomFee(_token);
    }

    /**
     * set `_feeCollector` as the token fee collector for `_token`
     * @param _token the token for which the fee collector is set
     * @param _feeCollector the address that will receive the token fees
     */
    function setCustomTokenFeeCollector(address _token, address _feeCollector) external onlyManager {
        require(_feeCollector != address(0), "Fee collector cannot be 0x0");
        require(_token != address(0), "Token cannot be 0x0");
        tokenFeeCollectors[_token] = _feeCollector;
        emit SetCustomTokenFeeCollector(_token, _feeCollector);
    }

    /**
     *  set `_feeCollector` as the crowdinvesting fee collector for `_token`
     * @param _token the token for which the fee collector is set
     * @param _feeCollector the address that will receive the crowdinvesting fees
     */
    function setCustomCrowdinvestingFeeCollector(address _token, address _feeCollector) external onlyManager {
        require(_feeCollector != address(0), "Fee collector cannot be 0x0");
        require(_token != address(0), "Token cannot be 0x0");
        crowdinvestingFeeCollectors[_token] = _feeCollector;
        emit SetCustomCrowdinvestingFeeCollector(_token, _feeCollector);
    }

    /**
     * set `_feeCollector` as the private offer fee collector for `_token`
     * @param _token the token for which the fee collector is set
     * @param _feeCollector the address that will receive the private offer fees
     */
    function setCustomPrivateOfferFeeCollector(address _token, address _feeCollector) external onlyManager {
        require(_feeCollector != address(0), "Fee collector cannot be 0x0");
        require(_token != address(0), "Token cannot be 0x0");
        privateOfferFeeCollectors[_token] = _feeCollector;
        emit SetCustomPrivateOfferFeeCollector(_token, _feeCollector);
    }

    /**
     * Reset the token fee collector for `_token` to the default fee collector
     * @param _token the token for which the custom fee collector is removed
     */
    function removeCustomTokenFeeCollector(address _token) external onlyManager {
        require(_token != address(0), "Token cannot be 0x0");
        delete tokenFeeCollectors[_token];
        emit RemoveCustomTokenFeeCollector(_token);
    }

    /**
     * Reset the crowdinvesting fee collector for `_token` to the default fee collector
     * @param _token the token for which the custom fee collector is removed
     */
    function removeCustomCrowdinvestingFeeCollector(address _token) external onlyManager {
        require(_token != address(0), "Token cannot be 0x0");
        delete crowdinvestingFeeCollectors[_token];
        emit RemoveCustomCrowdinvestingFeeCollector(_token);
    }

    /**
     * Reset the private offer fee collector for `_token` to the default fee collector
     * @param _token the token for which the custom fee collector is removed
     */
    function removeCustomPrivateOfferFeeCollector(address _token) external onlyManager {
        require(_token != address(0), "Token cannot be 0x0");
        delete privateOfferFeeCollectors[_token];
        emit RemoveCustomPrivateOfferFeeCollector(_token);
    }

    /**
     * @notice Returns the token fee collector for a given token
     * @param _token The token to return the token fee collector for
     * @return The fee collector
     */
    function tokenFeeCollector(address _token) public view override(IFeeSettingsV2) returns (address) {
        if (tokenFeeCollectors[_token] != address(0)) {
            return tokenFeeCollectors[_token];
        }
        return tokenFeeCollectors[address(0)];
    }

    /**
     * @notice Returns the crowdinvesting fee collector for a given token
     * @param _token The token to return the crowdinvesting fee collector for
     * @return The fee collector
     */
    function crowdinvestingFeeCollector(address _token) public view override(IFeeSettingsV2) returns (address) {
        if (crowdinvestingFeeCollectors[_token] != address(0)) {
            return crowdinvestingFeeCollectors[_token];
        }
        return crowdinvestingFeeCollectors[address(0)];
    }

    /**
     * @notice Returns the private offer fee collector for a given token
     * @param _token The token to return the private offer fee collector for
     * @return The fee collector
     */
    function privateOfferFeeCollector(address _token) public view override(IFeeSettingsV2) returns (address) {
        if (privateOfferFeeCollectors[_token] != address(0)) {
            return privateOfferFeeCollectors[_token];
        }
        return privateOfferFeeCollectors[address(0)];
    }

    /**
     * General linear fee calculation function
     * @param amount how many erc20 tokens are transferred
     * @param numerator fee numerator
     */
    function _fee(uint256 amount, uint32 numerator) internal pure returns (uint256) {
        return (amount * numerator) / FEE_DENOMINATOR;
    }

    /**
     * Calculates the fee for a given amount of tokens.
     * @param amount how many erc20 tokens are transferred
     * @param defaultNumerator default fee numerator
     * @param customNumerator custom fee numerator
     * @param customValidityDate custom fee validity date
     */
    function _customFee(
        uint256 amount,
        uint32 defaultNumerator,
        uint32 customNumerator,
        uint64 customValidityDate
    ) internal view returns (uint256) {
        if (customValidityDate < uint64(block.timestamp)) {
            return _fee(amount, defaultNumerator);
        }
        uint256 defaultFee = _fee(amount, defaultNumerator);
        uint256 customFee = _fee(amount, customNumerator);
        if (customFee < defaultFee) {
            return customFee;
        }
        return defaultFee;
    }

    /**
     * calculates the token fee in tokens for the given token amount
     * @param _tokenAmount number of tokens that are minted
     * @param _token address of the token contract minting the tokens
     */
    function tokenFee(uint256 _tokenAmount, address _token) public view override(IFeeSettingsV2) returns (uint256) {
        return
            _customFee(
                _tokenAmount,
                fees[address(0)].tokenFeeNumerator,
                fees[_token].tokenFeeNumerator,
                fees[_token].validityDate
            );
    }

    /**
     * Calculates the fee for a given currency amount in Crowdinvesting (v5) or ContinuousFundraising (v4)
     * @param _currencyAmount how much currency is raised
     * @param _token the token that is sold through the crowdinvesting
     * @return the fee
     */
    function crowdinvestingFee(
        uint256 _currencyAmount,
        address _token
    ) public view override(IFeeSettingsV2) returns (uint256) {
        return
            _customFee(
                _currencyAmount,
                fees[address(0)].crowdinvestingFeeNumerator,
                fees[_token].crowdinvestingFeeNumerator,
                fees[_token].validityDate
            );
    }

    /**
     * Calculates the fee for a given currency amount in PrivateOffer (v5) or PersonalInvite (v4)
     * @param _currencyAmount how much currency is raised
     * @return the fee
     */
    function privateOfferFee(
        uint256 _currencyAmount,
        address _token
    ) public view override(IFeeSettingsV2) returns (uint256) {
        return
            _customFee(
                _currencyAmount,
                fees[address(0)].privateOfferFeeNumerator,
                fees[_token].privateOfferFeeNumerator,
                fees[_token].validityDate
            );
    }

    /**
     * @dev Specify where the implementation of owner() is located
     * @return The owner of the contract
     */
    function owner() public view override(OwnableUpgradeable, IFeeSettingsV1, IFeeSettingsV2) returns (address) {
        return OwnableUpgradeable.owner();
    }

    modifier onlyManager() {
        require(managers[_msgSender()], "Only managers can call this function");
        _;
    }

    /**
     * @notice This contract implements the ERC165 interface in order to enable other contracts to query which interfaces this contract implements.
     * @dev See https://eips.ethereum.org/EIPS/eip-165
     * @return `true` for supported interfaces, otherwise `false`
     */
    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override(ERC165Upgradeable, IFeeSettingsV1, IFeeSettingsV2) returns (bool) {
        return
            interfaceId == type(IFeeSettingsV1).interfaceId || // we implement IFeeSettingsV1 for backwards compatibility
            interfaceId == type(IFeeSettingsV2).interfaceId || // we implement IFeeSettingsV2
            ERC165Upgradeable.supportsInterface(interfaceId); // default implementation that enables further querying
    }

    /**
     * @notice Returns the default token fee collector
     * @dev this is a compatibility function for IFeeSettingsV1. It enables older token contracts to use the new fee settings contract.
     * @dev as IFeeSettingsV1 only supports a single fee collector, we can not inquire the token address. Therefore, we return the default fee collector.
     * @return The token fee collector
     */
    function feeCollector() external view override(IFeeSettingsV1) returns (address) {
        return tokenFeeCollectors[address(0)];
    }

    /**
     * @notice Returns the fee for a given token amount
     * @dev Custom fees are only applied correctly when this function is called from the token contract itself.
     * To calculate fees when calling from a different address, use `tokenFee(uint256, address)` instead.
     */
    function tokenFee(uint256 _tokenAmount) external view override(IFeeSettingsV1) returns (uint256) {
        return tokenFee(_tokenAmount, _msgSender());
    }

    /**
     * @notice calculate the fee for a given currency amount in Crowdinvesting (formerly ContinuousFundraising)
     * @dev this is a compatibility function for IFeeSettingsV1. It enables older token contracts to use the new fee settings contract.
     * @param _currencyAmount The amount of currency to calculate the fee for
     */
    function continuousFundraisingFee(
        uint256 _currencyAmount
    ) external view override(IFeeSettingsV1) returns (uint256) {
        return crowdinvestingFee(_currencyAmount, address(0));
    }

    /**
     * @notice calculate the fee for a given currency amount in PrivateOffer (formerly PersonalInvite)
     * @dev this is a compatibility function for IFeeSettingsV1. It enables older token contracts to use the new fee settings contract.
     * @param _currencyAmount The amount of currency to calculate the fee for
     */
    function personalInviteFee(uint256 _currencyAmount) external view override(IFeeSettingsV1) returns (uint256) {
        return privateOfferFee(_currencyAmount, address(0));
    }

    /**
     * @dev both Ownable and ERC2771Context have a _msgSender() function, so we need to override and select which one to use.
     */
    function _msgSender() internal view override(ContextUpgradeable, ERC2771ContextUpgradeable) returns (address) {
        return ERC2771ContextUpgradeable._msgSender();
    }

    /**
     * @dev both Ownable and ERC2771Context have a _msgData() function, so we need to override and select which one to use.
     */
    function _msgData() internal view override(ContextUpgradeable, ERC2771ContextUpgradeable) returns (bytes calldata) {
        return ERC2771ContextUpgradeable._msgData();
    }

    /**
     * @dev both Ownable and ERC2771Context have a _contextSuffixLength() function, so we need to override and select which one to use.
     */
    function _contextSuffixLength()
        internal
        view
        virtual
        override(ContextUpgradeable, ERC2771ContextUpgradeable)
        returns (uint256)
    {
        return ERC2771ContextUpgradeable._contextSuffixLength();
    }
}

// File: contracts/factories/CloneFactory.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.23;

import "@openzeppelin/contracts/proxy/Clones.sol";
import "./Factory.sol";

/**
 * @title CloneFactory
 * @dev Inherit from this contract to allow creation of Clones of a specific contract.
 * @author malteish
 */

abstract contract CloneFactory is Factory {
    event NewClone(address clone);

    constructor(address _implementation) Factory(_implementation) {}

    /**
     * @notice Predicts the address of a clone that will be created
     * @param salt The salt used to deterministically generate the clone address
     * @return The address of the clone that will be created
     * @dev This function does not check if the clone has already been created
     */
    function predictCloneAddress(bytes32 salt) public view returns (address) {
        return Clones.predictDeterministicAddress(implementation, salt);
    }
}

// File: node_modules/@openzeppelin/contracts-upgradeable/access/Ownable2StepUpgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./OwnableUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2StepUpgradeable is Initializable, OwnableUpgradeable {
    address private _pendingOwner;

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

    function __Ownable2Step_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable2Step_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// File: node_modules/@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import {Initializable} from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// File: node_modules/@openzeppelin/contracts-upgradeable/metatx/ERC2771ContextUpgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (metatx/ERC2771Context.sol)

pragma solidity ^0.8.9;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Context variant with ERC2771 support.
 *
 * WARNING: The usage of `delegatecall` in this contract is dangerous and may result in context corruption.
 * Any forwarded request to this contract triggering a `delegatecall` to itself will result in an invalid {_msgSender}
 * recovery.
 */
abstract contract ERC2771ContextUpgradeable is Initializable, ContextUpgradeable {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    address private immutable _trustedForwarder;

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor(address trustedForwarder) {
        _trustedForwarder = trustedForwarder;
    }

    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
        return forwarder == _trustedForwarder;
    }

    function _msgSender() internal view virtual override returns (address) {
        uint256 calldataLength = msg.data.length;
        uint256 contextSuffixLength = _contextSuffixLength();
        if (isTrustedForwarder(msg.sender) && calldataLength >= contextSuffixLength) {
            return address(bytes20(msg.data[calldataLength - contextSuffixLength:]));
        } else {
            return super._msgSender();
        }
    }

    function _msgData() internal view virtual override returns (bytes calldata) {
        uint256 calldataLength = msg.data.length;
        uint256 contextSuffixLength = _contextSuffixLength();
        if (isTrustedForwarder(msg.sender) && calldataLength >= contextSuffixLength) {
            return msg.data[:calldataLength - contextSuffixLength];
        } else {
            return super._msgData();
        }
    }

    /**
     * @dev ERC-2771 specifies the context as being a single address (20 bytes).
     */
    function _contextSuffixLength() internal view virtual override returns (uint256) {
        return 20;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// File: contracts/interfaces/IFeeSettings.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.23;

import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

/**
 * @title IFeeSettingsV1
 * @author malteish
 * @notice This is the interface for the FeeSettings contract in v4 of the tokenize.it contracts. The token contract
 * and the investment contracts will use this interface to get the fees for the different actions, as well as the address
 * of the fee collector.
 */
interface IFeeSettingsV1 {
    function tokenFee(uint256) external view returns (uint256);

    function continuousFundraisingFee(uint256) external view returns (uint256);

    function personalInviteFee(uint256) external view returns (uint256);

    function feeCollector() external view returns (address);

    function owner() external view returns (address);

    function supportsInterface(bytes4) external view returns (bool); //because we inherit from ERC165
}

/**
 * @title IFeeSettingsV2
 * @author malteish
 * @notice This is the interface for the FeeSettings contract in v5 of the tokenize.it contracts.
 * From v4 to v5, the contract names have changed and instead of one fee collector, there are now three.
 */
interface IFeeSettingsV2 {
    function tokenFee(uint256, address) external view returns (uint256);

    function tokenFeeCollector(address) external view returns (address);

    function crowdinvestingFee(uint256, address) external view returns (uint256);

    function crowdinvestingFeeCollector(address) external view returns (address);

    function privateOfferFee(uint256, address) external view returns (uint256);

    function privateOfferFeeCollector(address) external view returns (address);

    function owner() external view returns (address);

    function supportsInterface(bytes4) external view returns (bool); //because we inherit from ERC165
}

/**
 * @notice The Fees struct contains all the parameters to change fee quantities and fee collector addresses,
 * as well as the time when the new settings can be activated.
 * @dev time has different meanings:
 *  1. it is ignored when the struct is used during initialization.
 *  2. it is the time when the new settings can be activated when the struct is used during a fee change.
 *  3. it is the time up to which the settings are valid when the struct is used for fee discounts for specific customers
 */
struct Fees {
    uint32 tokenFeeNumerator;
    uint32 crowdinvestingFeeNumerator;
    uint32 privateOfferFeeNumerator;
    uint64 validityDate;
}

// File: node_modules/@openzeppelin/contracts/proxy/Clones.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/Clones.sol)

pragma solidity ^0.8.0;

/**
 * @dev https://eips.ethereum.org/EIPS/eip-1167[EIP 1167] is a standard for
 * deploying minimal proxy contracts, also known as "clones".
 *
 * > To simply and cheaply clone contract functionality in an immutable way, this standard specifies
 * > a minimal bytecode implementation that delegates all calls to a known, fixed address.
 *
 * The library includes functions to deploy a proxy using either `create` (traditional deployment) or `create2`
 * (salted deterministic deployment). It also includes functions to predict the addresses of clones deployed using the
 * deterministic method.
 *
 * _Available since v3.4._
 */
library Clones {
    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create opcode, which should never revert.
     */
    function clone(address implementation) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create(0, 0x09, 0x37)
        }
        require(instance != address(0), "ERC1167: create failed");
    }

    /**
     * @dev Deploys and returns the address of a clone that mimics the behaviour of `implementation`.
     *
     * This function uses the create2 opcode and a `salt` to deterministically deploy
     * the clone. Using the same `implementation` and `salt` multiple time will revert, since
     * the clones cannot be deployed twice at the same address.
     */
    function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
        /// @solidity memory-safe-assembly
        assembly {
            // Cleans the upper 96 bits of the `implementation` word, then packs the first 3 bytes
            // of the `implementation` address with the bytecode before the address.
            mstore(0x00, or(shr(0xe8, shl(0x60, implementation)), 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000))
            // Packs the remaining 17 bytes of `implementation` with the bytecode after the address.
            mstore(0x20, or(shl(0x78, implementation), 0x5af43d82803e903d91602b57fd5bf3))
            instance := create2(0, 0x09, 0x37, salt)
        }
        require(instance != address(0), "ERC1167: create2 failed");
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt,
        address deployer
    ) internal pure returns (address predicted) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(add(ptr, 0x38), deployer)
            mstore(add(ptr, 0x24), 0x5af43d82803e903d91602b57fd5bf3ff)
            mstore(add(ptr, 0x14), implementation)
            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73)
            mstore(add(ptr, 0x58), salt)
            mstore(add(ptr, 0x78), keccak256(add(ptr, 0x0c), 0x37))
            predicted := keccak256(add(ptr, 0x43), 0x55)
        }
    }

    /**
     * @dev Computes the address of a clone deployed using {Clones-cloneDeterministic}.
     */
    function predictDeterministicAddress(
        address implementation,
        bytes32 salt
    ) internal view returns (address predicted) {
        return predictDeterministicAddress(implementation, salt, address(this));
    }
}

// File: contracts/factories/Factory.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.8.23;

/**
 * @title Factory
 * @author malteish
 * @notice inherit from this contract to create a factory for a specific contract
 */

abstract contract Factory {
    /// The address of the implementation contract
    address immutable implementation;

    constructor(address _implementation) {
        require(_implementation != address(0), "Factory: implementation can not be zero");
        implementation = _implementation;
    }
}

// File: node_modules/@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.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.
 *
 * By default, the owner account will be the one that deploys the contract. 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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// File: node_modules/@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// File: node_modules/@openzeppelin/contracts-upgradeable/utils/introspection/IERC165Upgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    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;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// File: node_modules/@openzeppelin/contracts/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: node_modules/@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @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, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * 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.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @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`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) 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(errorMessage);
        }
    }
}

// File: node_modules/@openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}