// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * 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 Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _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 anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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);
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @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.
 */
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].
     */
    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);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../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;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: @openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.0;

import "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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
     * ====
     *
     * [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://diligence.consensys.net/posts/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/v0.5.11/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: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/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);
}

// File: src/contracts/interfaces/ConduitInterface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

enum ConduitItemType {
    NATIVE, // unused
    ERC20,
    ERC721,
    ERC1155
}

/**
 * @dev A ConduitTransfer is a struct that contains the information needed for a
 *      conduit to transfer an item from one address to another.
 */
struct ConduitTransfer {
  ConduitItemType itemType;
  address token;
  address from;
  address to;
  uint256 identifier;
  uint256 amount;
}

/**
 * @dev A ConduitBatch1155Transfer is a struct that contains the information
 *      needed for a conduit to transfer a batch of ERC-1155 tokens from one
 *      address to another.
 */
struct ConduitBatch1155Transfer {
  address token;
  address from;
  address to;
  uint256[] ids;
  uint256[] amounts;
}

/**
 * @title ConduitInterface
 * @author 0age
 * @notice ConduitInterface contains all external function interfaces, events,
 *         and errors for conduit contracts.
 */
interface ConduitInterface {
  /**
    * @dev Revert with an error when attempting to execute transfers using a
    *      caller that does not have an open channel.
    */
  error ChannelClosed(address channel);

  /**
    * @dev Revert with an error when attempting to update a channel to the
    *      current status of that channel.
    */
  error ChannelStatusAlreadySet(address channel, bool isOpen);

  /**
    * @dev Revert with an error when attempting to execute a transfer for an
    *      item that does not have an ERC20/721/1155 item type.
    */
  error InvalidItemType();

  /**
    * @dev Revert with an error when attempting to update the status of a
    *      channel from a caller that is not the conduit controller.
    */
  error InvalidController();

  /**
    * @dev Emit an event whenever a channel is opened or closed.
    *
    * @param channel The channel that has been updated.
    * @param open    A boolean indicating whether the conduit is open or not.
    */
  event ChannelUpdated(address indexed channel, bool open);

  /**
    * @notice Execute a sequence of ERC20/721/1155 transfers. Only a caller
    *         with an open channel can call this function.
    *
    * @param transfers The ERC20/721/1155 transfers to perform.
    *
    * @return magicValue A magic value indicating that the transfers were
    *                    performed successfully.
    */
  function execute(
      ConduitTransfer[] calldata transfers
  ) external returns (bytes4 magicValue);

  /**
    * @notice Execute a sequence of batch 1155 transfers. Only a caller with an
    *         open channel can call this function.
    *
    * @param batch1155Transfers The 1155 batch transfers to perform.
    *
    * @return magicValue A magic value indicating that the transfers were
    *                    performed successfully.
    */
  function executeBatch1155(
      ConduitBatch1155Transfer[] calldata batch1155Transfers
  ) external returns (bytes4 magicValue);

  /**
    * @notice Execute a sequence of transfers, both single and batch 1155. Only
    *         a caller with an open channel can call this function.
    *
    * @param standardTransfers  The ERC20/721/1155 transfers to perform.
    * @param batch1155Transfers The 1155 batch transfers to perform.
    *
    * @return magicValue A magic value indicating that the transfers were
    *                    performed successfully.
    */
  function executeWithBatch1155(
      ConduitTransfer[] calldata standardTransfers,
      ConduitBatch1155Transfer[] calldata batch1155Transfers
  ) external returns (bytes4 magicValue);

  /**
    * @notice Open or close a given channel. Only callable by the controller.
    *
    * @param channel The channel to open or close.
    * @param isOpen  The status of the channel (either open or closed).
    */
  function updateChannel(address channel, bool isOpen) external;
}

// File: src/contracts/protocols/arcade/ArcadeAddressProvider.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

contract ArcadeAddressProvider {

  address public loanCoreAddress = 0x81b2F8Fc75Bab64A6b144aa6d2fAa127B4Fa7fD9;
  address public vaultFactoryAddress = 0x6e9B4c2f6Bd57b7b924d29b5dcfCa1273Ecc94A2;
  address public vaultRouterAddress = 0x4B95640d56f81Fc851F952793f4e5485E352bED2;
  address public originationControllerAddress = 0x4c52ca29388A8A854095Fd2BeB83191D68DC840b;
  address public repaymentControllerAddress = 0xb39dAB85FA05C381767FF992cCDE4c94619993d4;

}
// File: src/contracts/protocols/arcade/ArcadeFeeController.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "./interfaces/ILoanCore.sol";
import "./interfaces/IFeeController.sol";
import "./ArcadeAddressProvider.sol";

contract ArcadeFeeController is ArcadeAddressProvider {

  /**
   * Get Fee Controller
   * https://etherscan.io/address/0x81b2f8fc75bab64a6b144aa6d2faa127b4fa7fd9#readProxyContract#F12
   */
  function getFeeControllerAddress() 
    public
    view
    returns (address feeControllerAddress)
  {
    ILoanCore loanCore = ILoanCore(loanCoreAddress);
    feeControllerAddress = loanCore.feeController();
  }

  /**
   * Calculate the fee for originating a new loan
   * @return fee net fee given amount and originationFee
   */
  function calculateOriginationFee(uint256 amount) 
    public
    view
    returns (uint256 fee)
  {
    IFeeController feeController = IFeeController(getFeeControllerAddress());
    uint256 originationFee = feeController.getOriginationFee();

    fee = amount * originationFee / 10000;
  }

  /**
   * Calculate the fee for rolling over into a new loan
   * @return fee net fee given amount and rolloverFee
   */
  function calculateRolloverFee(uint256 amount)
    public
    view
    returns (uint256 fee)
  {
    IFeeController feeController = IFeeController(getFeeControllerAddress());
    uint256 rolloverFee = feeController.getRolloverFee();

    fee = amount * rolloverFee / 10000;
  }
}

// File: src/contracts/protocols/arcade/ArcadeLoanCore.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "./interfaces/ILoanCore.sol";
import "./ArcadeAddressProvider.sol";

contract ArcadeLoanCore is ArcadeAddressProvider{
  
  /**
   * Get Loan Data
   * https://etherscan.io/address/0x81b2f8fc75bab64a6b144aa6d2faa127b4fa7fd9#readProxyContract#F14
   * @param loanId the identifier of the outstanding loan
   */
  function getLoanData(
    uint256 loanId
  ) public
    view
    returns (
      uint256 vaultId,
      uint256 principal,
      uint256 interestRate,
      address payableCurrency
    )
  {
    ILoanCore loanCore = ILoanCore(loanCoreAddress);
    ILoanCore.LoanData memory data = loanCore.getLoan(loanId);

    // get the loan terms associated with the loan
    ILoanCore.LoanTerms memory loanTerms = data.terms;
    vaultId = loanTerms.collateralId;
    principal = loanTerms.principal;
    interestRate = loanTerms.interestRate;
    payableCurrency = loanTerms.payableCurrency;
  }

  function getTotalRepaymentAmount(
    uint256 principal,
    uint256 interestRate
  ) public
    view
    returns (uint256 repaymentAmount)
  {
    ILoanCore loanCore = ILoanCore(loanCoreAddress);
    repaymentAmount = loanCore.getFullInterestAmount(principal, interestRate);
  }

  /**
   * Get Borrower Address
   * https://etherscan.io/address/0x81b2f8fc75bab64a6b144aa6d2faa127b4fa7fd9#readProxyContract#F10
   * @return borrowerNoteAddress address of the borrowerNote implementation
   */
  function getBorrowerNoteAddress() public view returns (address borrowerNoteAddress)
  {
    ILoanCore loanCore = ILoanCore(loanCoreAddress);
    borrowerNoteAddress = loanCore.borrowerNote();
  }
}

// File: src/contracts/protocols/arcade/ArcadeOriginationController.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "./ArcadeAddressProvider.sol";
import "./interfaces/IOriginationController.sol";
import "./structs/ArcadeStructs.sol";

contract ArcadeOriginationController is ArcadeAddressProvider {

  /**
   * Intialize a new Arcade loan
   * https://etherscan.io/address/0x4c52ca29388A8A854095Fd2BeB83191D68DC840b#writeProxyContract#F7
   * @param loan a well structured Arcade loan object
   * @param vaultId identifier of the vault containing the asset
   */
  function initializeLoan(
    ArcadeLoan calldata loan,
    uint256 vaultId
  ) internal 
    returns (uint256 loanId)
  {
    // match loan terms and item predicates
    IOriginationController.LoanTerms memory matchingLoanTerms = matchLoanTerms(loan.loanTerms, vaultId);
    IOriginationController.Predicate[] memory predicates = matchItemPredicates(loan.itemPredicate);

    // initialize loan
    IOriginationController originationController = IOriginationController(originationControllerAddress);
    loanId = originationController.initializeLoanWithItems(
      matchingLoanTerms,
      address(this),
      loan.lenderAddress,
      loan.sig,
      loan.nonce,
      predicates
    );
  }

  /**
   * Rollover an Arcade loan into a new loan
   * https://etherscan.io/address/0x4c52ca29388A8A854095Fd2BeB83191D68DC840b#writeProxyContract#F11
   * @param oldLoanId identifier of the outstanding loan
   * @param loan a well structured Arcade loan object
   * @param vaultId identifier of the vault containing the asset
   * @return newLoanId identifier of the new loan
   */
  function rolloverLoan(
    uint256 oldLoanId,
    ArcadeLoan calldata loan,
    uint256 vaultId
  ) internal
    returns (uint256 newLoanId)
  {
    // match loan terms and item predicates
    IOriginationController.LoanTerms memory matchingLoanTerms = matchLoanTerms(loan.loanTerms, vaultId);
    IOriginationController.Predicate[] memory predicates = matchItemPredicates(loan.itemPredicate);

    // rollover loan
    IOriginationController originationController = IOriginationController(originationControllerAddress);
    newLoanId = originationController.rolloverLoanWithItems(
      oldLoanId,
      matchingLoanTerms,
      loan.lenderAddress,
      loan.sig,
      loan.nonce,
      predicates
    );
  }

  /**
   * Match loan terms
   * adds newly created vaultId to the loan terms 
   * @param loanTerms base loan terms without vaultId
   * @param vaultId identifier of the newly created vault
   * @return matchedLoanTerms well structured Arcade loan object
   */
  function matchLoanTerms(
    BaseLoanTerms calldata loanTerms,
    uint256 vaultId
  ) internal
    view
    returns (IOriginationController.LoanTerms memory matchedLoanTerms)
  {
    matchedLoanTerms = IOriginationController.LoanTerms({
      durationSecs: loanTerms.durationSecs,
      deadline: loanTerms.deadline,
      numInstallments: loanTerms.numInstallments,
      interestRate: loanTerms.interestRate,
      principal: loanTerms.principal,
      collateralAddress: vaultFactoryAddress,
      collateralId: vaultId,
      payableCurrency:loanTerms.payableCurrency
    });
  }

  /**
   * Match item predicates
   * formats single predicate into an array of predicates
   * @param predicate the original predicate
   * @return predicates an array of size one of single item predicate
   */
  function matchItemPredicates(
    IOriginationController.Predicate calldata predicate
  ) internal
    pure
    returns (IOriginationController.Predicate[] memory predicates)
  {
    predicates = new IOriginationController.Predicate[](1);
    predicates[0] = IOriginationController.Predicate(
      predicate.data,
      predicate.verifier
    );
  }
}
// File: src/contracts/protocols/arcade/ArcadeVaultInteractions.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

import "./ArcadeAddressProvider.sol";
import "../SkilletProtocolBase.sol";

import "./interfaces/IVaultFactory.sol";
import "./interfaces/IVaultRouter.sol";
import "./interfaces/IAssetVault.sol";

contract ArcadeVaultInteractions is
  ArcadeAddressProvider,
  SkilletProtocolBase
{ 

  constructor(address _skilletRegistryAddress) SkilletProtocolBase(_skilletRegistryAddress) {}

  /**
   * Create new Arcade Vault
   * https://etherscan.io/address/0x6e9B4c2f6Bd57b7b924d29b5dcfCa1273Ecc94A2#writeProxyContract#F4
   * @return vaultId unique identifier for the new vault
   */
  function createVault() 
    internal 
    returns (uint256 vaultId) 
  {
    IVaultFactory vaultFactory = IVaultFactory(vaultFactoryAddress);
    vaultId = vaultFactory.initializeBundle(address(this));
  }

  /**
   * Get the vault address for the provided vault id
   * https://etherscan.io/address/0x6e9B4c2f6Bd57b7b924d29b5dcfCa1273Ecc94A2#readProxyContract#F10
   * @param vaultId unique identifier returned by initializeBundle
   * @return vaultAddress address of the given vault implementation
   */
  function getVaultAddress(uint256 vaultId) 
    internal 
    view
    returns (address vaultAddress) 
  {
    IVaultFactory vaultFactory = IVaultFactory(vaultFactoryAddress);
    vaultAddress = vaultFactory.instanceAt(vaultId);
  }

  /**
   * Approve the origination controller to transfer the vault
   * https://etherscan.io/address/0x6e9B4c2f6Bd57b7b924d29b5dcfCa1273Ecc94A2#writeProxyContract#F1
   * @param vaultAddress the address of the unique vault implementation
   */
  function approveVaultTransfer(address vaultAddress) 
    internal 
  {
    IVaultFactory vaultFactory = IVaultFactory(vaultFactoryAddress);
    vaultFactory.approve(
      originationControllerAddress,
      uint256(uint160(vaultAddress))
    );
  }

  /**
   * Deposit a single ERC721 asset into the vault implementation
   * https://etherscan.io/address/0x4B95640d56f81Fc851F952793f4e5485E352bED2#writeContract#F5
   * @param vaultAddress address of the given vault implementation
   * @param collectionAddress address of the ERC721
   * @param tokenId identifier of the ERC721
   */
  function depositAsset(
    address vaultAddress, 
    address collectionAddress,
    uint256 tokenId
  ) internal 
  {
    // check and set approval for vaultRouterAddress
    checkAndSetOperatorApprovalForERC721(
      vaultRouterAddress, 
      collectionAddress
    );

    // deposit nft into vault
    IVaultRouter vaultRouter = IVaultRouter(vaultRouterAddress);
    vaultRouter.depositERC721(
      vaultAddress,
      collectionAddress,
      tokenId
    );
  }

  /**
   * Withdraw an asset from the vault identified by vaultId
   * https://etherscan.io/address/0xd898456e39a461b102ce4626aac191582c38acb6#writeContract#F9
   * @param vaultId unique identifier returned by initializeBundle
   * @param borrowerAddress address to send the ERC721
   * @param collectionAddress address of the ERC721
   * @param tokenId identifier of the ERC721
   */
  function withdrawAsset(
    uint256 vaultId,
    address borrowerAddress,
    address collectionAddress,
    uint256 tokenId
  ) internal 
  {
    address vaultAddress = getVaultAddress(vaultId);
    IAssetVault assetVault = IAssetVault(vaultAddress);

    assetVault.enableWithdraw();
    assetVault.withdrawERC721(collectionAddress, tokenId, borrowerAddress);
  }
}

// File: src/contracts/protocols/arcade/interfaces/IAssetVault.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

/**
 * Skillet <> Arcade
 * Asset Vault Interface
 * https://etherscan.io/address/0xd898456e39a461b102ce4626aac191582c38acb6#code
 */
interface IAssetVault {
  function enableWithdraw() external;
  function withdrawERC721(address token, uint256 tokenId, address to) external;
}

// File: src/contracts/protocols/arcade/interfaces/IFeeController.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

/**
 * Skillet <> Arcade
 * Fee Controller Interface
 * https://etherscan.io/address/0x41E538817C3311ed032653bEE5487a113F8CfF9F#code
 */
interface IFeeController {
  function getRolloverFee() external view returns (uint256);
  function getOriginationFee() external view returns (uint256);
}

// File: src/contracts/protocols/arcade/interfaces/ILoanCore.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

/**
 * Skillet <> Arcade
 * Loan Core Interface
 * https://etherscan.io/address/0x81b2F8Fc75Bab64A6b144aa6d2fAa127B4Fa7fD9#code
 */
interface ILoanCore {
  enum LoanState {
    DUMMY_DO_NOT_USE,
    Active,
    Repaid,
    Defaulted
  }

  struct LoanTerms {
    uint32 durationSecs;
    uint32 deadline;
    uint24 numInstallments;
    uint160 interestRate;
    uint256 principal;
    address collateralAddress;
    uint256 collateralId;
    address payableCurrency;
  }

  struct LoanData {
    LoanState state;
    uint24 numInstallmentsPaid;
    uint160 startDate;
    LoanTerms terms;
    uint256 balance;
    uint256 balancePaid;
    uint256 lateFeesAccrued;
  }

  function getLoan(uint256 loanId) external view returns (LoanData memory);
  function getFullInterestAmount(uint256 principal, uint256 interestRate) external pure returns (uint256);
  function feeController() external view returns (address);
  function borrowerNote() external view returns (address);
}

// File: src/contracts/protocols/arcade/interfaces/IOriginationController.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

/**
 * Skillet <> Arcade
 * Origination Controller Interface
 * https://etherscan.io/address/0x4c52ca29388A8A854095Fd2BeB83191D68DC840b#code
 */
interface IOriginationController {
  struct LoanTerms {
    uint32 durationSecs;
    uint32 deadline;
    uint24 numInstallments;
    uint160 interestRate;
    uint256 principal;
    address collateralAddress;
    uint256 collateralId;
    address payableCurrency;
  }

  struct Signature {
    uint8 v;
    bytes32 r;
    bytes32 s;
  }

  struct Predicate {
    bytes data;
    address verifier;
  }

  function initializeLoanWithItems(
    LoanTerms calldata loanTerms,
    address borrower,
    address lender,
    Signature calldata sig,
    uint160 nonce,
    Predicate[] calldata itemPredicates
  ) external returns (uint256);

  function rolloverLoanWithItems(
    uint256 oldLoanId,
    LoanTerms calldata loanTerms,
    address lender,
    Signature calldata sig,
    uint160 nonce,
    Predicate[] calldata itemPredicates
  ) external returns (uint256 newLoanId);
}

// File: src/contracts/protocols/arcade/interfaces/IRepaymentController.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

/**
 * Skillet <> Arcade
 * Repayment Controller Interface
 * https://etherscan.io/address/0xb39dAB85FA05C381767FF992cCDE4c94619993d4#code
 */
interface IRepaymentController {
  function repay(uint256 loanId) external;
}

// File: src/contracts/protocols/arcade/interfaces/IVaultFactory.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

/**
 * Skillet <> Arcade
 * Vault Factory Interface
 * https://etherscan.io/address/0x6e9B4c2f6Bd57b7b924d29b5dcfCa1273Ecc94A2#code
 */
interface IVaultFactory is IERC721 {
  function instanceAt(uint256 tokenId) external view returns (address);  
  function initializeBundle(address to) external returns(uint256);
  function approve(address controller, uint256 vaultAddress) external;
}

// File: src/contracts/protocols/arcade/interfaces/IVaultRouter.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

/**
 * Skillet <> Arcade
 * Vault Router Interface
 * https://etherscan.io/address/0x4B95640d56f81Fc851F952793f4e5485E352bED2#code
 */
interface IVaultRouter {
  function depositERC721(address vaultAddress, address collectionAddress, uint256 tokenId) external;
}

// File: src/contracts/protocols/arcade/SkilletxArcade.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "../../SkilletRegistry.sol";
import "../SkilletProtocolBase.sol";
import "./ArcadeAddressProvider.sol";
import "./ArcadeLoanCore.sol";
import "./ArcadeOriginationController.sol";
import "./ArcadeVaultInteractions.sol";
import "./ArcadeFeeController.sol";

import "./interfaces/IRepaymentController.sol";
import "./interfaces/IFeeController.sol";

import "./structs/ArcadeStructs.sol";

/**
 * Skillet <> Arcade
 * https://docs.arcade.xyz/docs/source-code
 */
contract SkilletxArcade is 
  ArcadeAddressProvider,
  SkilletProtocolBase,
  ArcadeLoanCore,
  ArcadeOriginationController,
  ArcadeVaultInteractions,
  ArcadeFeeController
{
  constructor(address _skilletRegistryAddress) ArcadeVaultInteractions(_skilletRegistryAddress) {}

  event ArcadeLoanStarted(
    address indexed borrower, 
    uint256 indexed vaultId, 
    uint256 indexed loanId,
    address collectionAddress,
    uint256 tokenId,
    uint256 netAmountOwed
  );

  event ArcadeLoanClosed(
    address indexed borrower, 
    uint256 indexed vaultId, 
    uint256 indexed loanId,
    address collectionAddress,
    uint256 tokenId,
    uint256 netAmountDue
  );

  event ArcadeLoanRolledOver(
    address indexed borrower, 
    uint256 indexed oldLoanId, 
    uint256 indexed newLoanId
  );

  /**
   * Start a new Arcade Loan
   * @param loan a structured Arcade loan object
   * @param borrowerAddress address of the borrower account
   * @param collectionAddress address of the ERC721
   * @param tokenId identifier of the ERC721
   */
  function startArcadeLoan(
    ArcadeLoan calldata loan,
    address borrowerAddress,
    address collectionAddress,
    uint256 tokenId
  ) public
  {

    // transfer NFT to contract
    conduitTransferERC721(
      collectionAddress,
      borrowerAddress,
      address(this),
      tokenId
    );

    // initialize an arcade vault
    uint256 vaultId = createVault();
    address vaultAddress = getVaultAddress(vaultId);

    // deposit asset into vault
    depositAsset(vaultAddress, collectionAddress, tokenId);

    // give originator contract access to vault
    approveVaultTransfer(vaultAddress);

    // start new loan with vault
    uint256 loanId = initializeLoan(loan, vaultId);

    // transfer borrowerNote to borrowerAddress
    transferERC721(
      address(this),
      borrowerAddress, 
      getBorrowerNoteAddress(),
      loanId
    );

    // calculate amount owed net of fee
    uint256 netAmountOwed = loan.loanTerms.principal - calculateOriginationFee(loan.loanTerms.principal);

    // transfer principal to borrowerAddress
    transferERC20(
      address(this),
      borrowerAddress,
      loan.loanTerms.payableCurrency, 
      netAmountOwed
    );

    emit ArcadeLoanStarted(
      borrowerAddress, 
      vaultId, 
      loanId,
      collectionAddress,
      tokenId,
      netAmountOwed
    );
  }

  /**
   * Close an existing Arcade Loan
   * @param loanId identifier of the outstanding loan
   * @param borrowerAddress address of the borrower account
   * @param collectionAddress address of the ERC721
   * @param tokenId identifier of the ERC721
   */
  function closeArcadeLoan(
    uint256 loanId,
    address borrowerAddress,
    address collectionAddress,
    uint256 tokenId
  ) public
  {

    conduitTransferERC721(
      getBorrowerNoteAddress(),
      borrowerAddress,
      address(this),
      loanId
    );

    // get the loan information
    (uint256 vaultId, uint256 principal, uint256 interestRate, address payableCurrency) = getLoanData(loanId);

    // get the full repayment amount
    uint256 repayment = getTotalRepaymentAmount(principal, interestRate);

    conduitTransferERC20(
      payableCurrency,
      borrowerAddress,
      address(this),
      repayment
    );

    // approve repayment controller for payment transfer
    checkAndSetOperatorApprovalForERC20(
      repaymentControllerAddress, 
      payableCurrency
    );

    // payback the loan
    IRepaymentController repaymentController = IRepaymentController(repaymentControllerAddress);
    repaymentController.repay(loanId);

    // withdraw the asset from the vault
    ArcadeVaultInteractions.withdrawAsset(
      vaultId,
      borrowerAddress,
      collectionAddress,
      tokenId
    );

    emit ArcadeLoanClosed(
      borrowerAddress, 
      vaultId, 
      loanId,
      collectionAddress,
      tokenId,
      repayment
    );
  }

  /**
   * Rollover an existing Arcade Loan to a new loan
   * @param loan a well structured Arcade loan object
   * @param oldLoanId identifier of the outstanding loan
   * @param borrowerAddress address of the borrower account
   */
  function rolloverArcadeLoan(
    ArcadeLoan calldata loan,
    uint256 oldLoanId,
    address borrowerAddress
  ) public 
  {

    conduitTransferERC721(
      getBorrowerNoteAddress(),
      borrowerAddress,
      address(this),
      oldLoanId
    );

    // get the loan information
    (uint256 vaultId, uint256 principal, uint256 interestRate,) = getLoanData(oldLoanId);

    // get net amount owed to borrower from rollover
    uint256 oldLoanRepayment = getTotalRepaymentAmount(principal, interestRate);

    uint256 totalFee = calculateRolloverFee(loan.loanTerms.principal);
    
    if (loan.loanTerms.principal < oldLoanRepayment + totalFee) {
      uint256 paymentDue = oldLoanRepayment + totalFee - loan.loanTerms.principal;
      conduitTransferERC20(
        loan.loanTerms.payableCurrency,
        borrowerAddress,
        address(this),
        paymentDue
      );

      approveOperatorForERC20(
        originationControllerAddress,
        loan.loanTerms.payableCurrency
      );
    }

    // rollover the loan
    uint256 newLoanId = rolloverLoan(oldLoanId, loan, vaultId);

    // transfer borrowerNote to borrowerAddress
    transferERC721(
      address(this),
      borrowerAddress,
      getBorrowerNoteAddress(), 
      newLoanId
    );
    
    if (loan.loanTerms.principal > oldLoanRepayment + totalFee) {
      uint256 paymentOwed = loan.loanTerms.principal - (oldLoanRepayment + totalFee);
      transferERC20(
        address(this),
        borrowerAddress,
        loan.loanTerms.payableCurrency,
        paymentOwed
      );
    }

    emit ArcadeLoanRolledOver(
      borrowerAddress, 
      oldLoanId, 
      newLoanId
    );
  }
}

// File: src/contracts/protocols/arcade/structs/ArcadeStructs.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "../interfaces/IOriginationController.sol";

struct BaseLoanTerms {
  uint32 durationSecs;
  uint32 deadline;
  uint24 numInstallments;
  uint160 interestRate;
  uint256 principal;
  address payableCurrency;
}

struct ArcadeLoan {
  BaseLoanTerms loanTerms;
  IOriginationController.Predicate itemPredicate;
  IOriginationController.Signature sig;
  uint160 nonce;
  address lenderAddress;
}

// File: src/contracts/protocols/SkilletProtocolBase.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";

import "../interfaces/ConduitInterface.sol";

interface ISkilletRegistry {
  function conduitAddress() external view returns (address);
}

contract SkilletProtocolBase is ERC721Holder {
  using SafeERC20 for IERC20;
  uint256 MAX_UINT_256 = 2**256 - 1;

  address public skilletRegistryAddress;

  constructor(address _skilletRegistryAddress) {
    skilletRegistryAddress = _skilletRegistryAddress;
  }

  /**
   * @dev Get Conduit Address
   * @return conduitAddress address of the approved conduit
   */
   function getConduitAddress() public view returns (address conduitAddress) {
    conduitAddress = ISkilletRegistry(skilletRegistryAddress).conduitAddress();
   }

  /**
   * @dev Transfer asset from sender to reciever
   * @param sender address of the sender
   * @param receiver address of the receiver
   * @param collectionAddress address of the ERC721 collection
   * @param tokenId token identifier in collection
   */
  function transferERC721(
    address sender,
    address receiver,
    address collectionAddress,
    uint256 tokenId
  ) public 
  {
    IERC721 collection = IERC721(collectionAddress);
    collection.safeTransferFrom(sender, receiver, tokenId);
  }

  /**
   * @dev Transfers amout of currency from sender to recevier
   * @param receiver address of the receiver
   * @param sender address of the sender
   * @param currencyAddress address of the currency being transferred
   * @param paymentAmount amount of currency to be sent to receiver
   */
  function transferERC20 (
    address sender,
    address receiver,
    address currencyAddress,
    uint256 paymentAmount
  ) public
  {
    IERC20 currency = IERC20(currencyAddress);
    if (sender == address(this)) {
      currency.transfer(receiver, paymentAmount);
      return;
    }

    currency.transferFrom(sender, receiver, paymentAmount);
  }

  function approveOperatorForERC721(
    address operator,
    address collectionAddress
  ) public
  {
    IERC721 collection = IERC721(collectionAddress);
    collection.setApprovalForAll(operator, true);
  }

  function checkAndSetOperatorApprovalForERC721(
    address operator,
    address collectionAddress
  ) public
  {
    IERC721 collection = IERC721(collectionAddress);
    bool approved = collection.isApprovedForAll(address(this), operator);
    if (!approved) collection.setApprovalForAll(operator, true);
  }

  function approveOperatorForERC20(
    address operator,
    address currencyAddress
  ) public
  {
    IERC20 currency = IERC20(currencyAddress);
    currency.approve(operator, MAX_UINT_256);
  }

  function checkAndSetOperatorApprovalForERC20(
    address operator,
    address currencyAddress
  ) public
  {
    IERC20 currency = IERC20(currencyAddress);
    uint256 allowance = currency.allowance(address(this), operator);
    if (!(allowance == MAX_UINT_256)) currency.approve(operator, MAX_UINT_256);
  }

  function conduitTransferERC721(
    address collectionAddress,
    address from,
    address to,
    uint256 tokenId
  ) public
  {
    ConduitTransfer[] memory transfers = new ConduitTransfer[](1);
    transfers[0] = ConduitTransfer({
      itemType: ConduitItemType.ERC721,
      token: collectionAddress,
      from: from,
      to: to,
      identifier: tokenId,
      amount: 1
    });

    ConduitInterface(getConduitAddress()).execute(transfers);
  }

  function conduitTransferERC20(
    address currencyAddress,
    address from,
    address to,
    uint256 amount
  ) public
  {
    ConduitTransfer[] memory paymentTransfers = new ConduitTransfer[](1);
    paymentTransfers[0] = ConduitTransfer({
      itemType: ConduitItemType.ERC20,
      token: currencyAddress,
      from: from,
      to: to,
      identifier: 0,
      amount: amount
    });

    ConduitInterface(getConduitAddress()).execute(paymentTransfers);
  }
}

// File: src/contracts/SkilletRegistry.sol



//SPDX-License-Identifier: Skillet-Group
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";

contract SkilletRegistry is Ownable {

  address public conduitAddress;
  mapping(bytes32 => address) public implementations;

  /**
   * Set the conduit address and store for reference
   * @param _conduitAddress address of the conduit
   */
  function setConduitAddress(address _conduitAddress) 
    public 
    onlyOwner 
  {
    require(_conduitAddress != address(0), "Invalid conduit address");
    conduitAddress = _conduitAddress;
  }

  /**
   * Add an implementation to mapping by unique key
   * key should be calculated as keccak256(IDENTIFIER)
   * @param _key bytes32 keccak256 of identifier for implementation
   * @param _address address of the implementation
   */
  function addImplementation(bytes32 _key, address _address)
    public
    onlyOwner
  {
    require(_address != address(0), "Invalid implementation address");
    implementations[_key] = _address;
  }
}