// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. 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);
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
    }

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

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";

/// @title ZerpmonStaking
/// @notice Contract for staking XRP/ZRP and ROOT/ZRP LP tokens, Zerpmon NFTs, and Zerpmon Equipment NFTs
contract ZerpmonStaking is Ownable, ReentrancyGuard, IERC721Receiver {
    using EnumerableSet for EnumerableSet.AddressSet;
    using EnumerableSet for EnumerableSet.UintSet;

    enum NftCollection {
        ZerpmonGenesis,
        ZerpmonEvolved,
        ZerpmonTrainersGenesis,
        ZerpmonTrainersEvolved,
        ZerpmonEquipment
    }

    /// @notice XRP/ZRP Liquidity Pool token
    IERC20 public xrpZrpLpToken;
    /// @notice ROOT/ZRP Liquidity Pool token
    IERC20 public rootZrpLpToken;
    /// @notice Zerpmon Genesis NFT
    IERC721 public zerpmonGenesisNft;
    /// @notice Zerpmon Evolved NFT
    IERC721 public zerpmonEvolvedNft;
    /// @notice Zerpmon Trainers Genesis NFT
    IERC721 public zerpmonTrainersGenesisNft;
    /// @notice Zerpmon Trainers Evolved NFT
    IERC721 public zerpmonTrainersEvolvedNft;
    /// @notice Zerpmon Equipment NFT
    IERC721 public zerpmonEquipmentNft;

    /// @notice Mapping of address to amount of XRP/ZRP LP tokens staked
    mapping(address => uint256) private xrpZrpLpStakes;

    /// @notice Mapping of address to amount of ROOT/ZRP LP tokens staked
    mapping(address => uint256) private rootZrpLpStakes;

    /// @notice Mapping of Zerpmon Genesis NFT ID to address of staker
    mapping(address => EnumerableSet.UintSet) private zerpmonGenesisNftStakes;

    /// @notice Mapping of Zerpmon Evolved NFT ID to address of staker
    mapping(address => EnumerableSet.UintSet) private zerpmonEvolvedNftStakes;

    /// @notice Mapping of Zerpmon Trainers Genesis NFT ID to address of staker
    mapping(address => EnumerableSet.UintSet) private zerpmonTrainersGenesisNftStakes;

    /// @notice Mapping of Zerpmon Trainers Evolved NFT ID to address of staker
    mapping(address => EnumerableSet.UintSet) private zerpmonTrainersEvolvedNftStakes;

    /// @notice Mapping of Zerpmon Equipment NFT ID to address of staker
    mapping(address => EnumerableSet.UintSet) private zerpmonEquipmentNftStakes;

    /// @notice All stakers enumerable set
    EnumerableSet.AddressSet private stakers;

    /// @notice Event emitted when a user stakes assets
    event Staked(address indexed user, uint256 amount, string assetType);

    /// @notice Event emitted when a user withdraws assets
    event Withdrawn(address indexed user, uint256 amount, string assetType);

    constructor() Ownable() {}

    /// @notice Function for staking XRP/ZRP LP tokens
    /// @param amount Amount of XRP/ZRP LP tokens to stake
    function stakeXrpZrpLpTokens(uint256 amount) external nonReentrant {
        require(address(xrpZrpLpToken) != address(0), "XRP/ZRP LP token not set");
        require(amount > 0, "Must stake more than 0 tokens");
        xrpZrpLpToken.transferFrom(msg.sender, address(this), amount);
        xrpZrpLpStakes[msg.sender] += amount;

        stakers.add(msg.sender);
        emit Staked(msg.sender, amount, "XRP/ZRP LP");
    }

    /// @notice Function for withdrawing XRP/ZRP LP tokens
    /// @param amount Amount of XRP/ZRP LP tokens to withdraw
    function withdrawXrpZrpLpTokens(uint256 amount) external nonReentrant {
        require(address(xrpZrpLpToken) != address(0), "XRP/ZRP LP token not set");
        require(amount > 0, "Must withdraw more than 0 tokens");
        require(xrpZrpLpStakes[msg.sender] >= amount, "Insufficient staked amount");

        xrpZrpLpToken.transfer(msg.sender, amount);
        xrpZrpLpStakes[msg.sender] -= amount;

        checkAndRemoveStaker(msg.sender);

        emit Withdrawn(msg.sender, amount, "XRP/ZRP LP");
    }

    /// @notice Function for staking ROOT/ZRP LP tokens
    /// @param amount Amount of ROOT/ZRP LP tokens to stake
    function stakeRootZrpLpTokens(uint256 amount) external nonReentrant {
        require(address(rootZrpLpToken) != address(0), "ROOT/ZRP LP token not set");
        require(amount > 0, "Must stake more than 0 tokens");
        rootZrpLpToken.transferFrom(msg.sender, address(this), amount);
        rootZrpLpStakes[msg.sender] += amount;

        stakers.add(msg.sender);
        emit Staked(msg.sender, amount, "ROOT/ZRP LP");
    }

    /// @notice Function for withdrawing ROOT/ZRP LP tokens
    /// @param amount Amount of ROOT/ZRP LP tokens to withdraw
    function withdrawRootZrpLpTokens(uint256 amount) external nonReentrant {
        require(amount > 0, "Must withdraw more than 0 tokens");
        require(rootZrpLpStakes[msg.sender] >= amount, "Insufficient staked amount");

        rootZrpLpToken.transfer(msg.sender, amount);
        rootZrpLpStakes[msg.sender] -= amount;

        checkAndRemoveStaker(msg.sender);

        emit Withdrawn(msg.sender, amount, "ROOT/ZRP LP");
    }

    /// @notice Function for staking Zerpmon NFTs
    /// @param collection Collection of the Zerpmon NFT
    /// @param nftId ID of the Zerpmon Genesis NFT to stake
    /// @dev 0 Zerpmon Genesis, 1 Zerpmon Evolved, 2 Zerpmon Trainers Genesis, 3 Zerpmon Trainers Evolved, 4 Zerpmon Equipment
    function stakeZerpmonNft(NftCollection collection, uint256 nftId) external nonReentrant {
        if (collection == NftCollection.ZerpmonGenesis) {
            require(address(zerpmonGenesisNft) != address(0), "Zerpmon Genesis NFT not set");
            zerpmonGenesisNft.safeTransferFrom(msg.sender, address(this), nftId);
            zerpmonGenesisNftStakes[msg.sender].add(nftId);
        } else if (collection == NftCollection.ZerpmonEvolved) {
            require(address(zerpmonEvolvedNft) != address(0), "Zerpmon Evolved NFT not set");
            zerpmonEvolvedNft.safeTransferFrom(msg.sender, address(this), nftId);
            zerpmonEvolvedNftStakes[msg.sender].add(nftId);
        } else if (collection == NftCollection.ZerpmonTrainersGenesis) {
            require(address(zerpmonTrainersGenesisNft) != address(0), "Zerpmon Trainers Genesis NFT not set");
            zerpmonTrainersGenesisNft.safeTransferFrom(msg.sender, address(this), nftId);
            zerpmonTrainersGenesisNftStakes[msg.sender].add(nftId);
        } else if (collection == NftCollection.ZerpmonTrainersEvolved) {
            require(address(zerpmonTrainersEvolvedNft) != address(0), "Zerpmon Trainers Evolved NFT not set");
            zerpmonTrainersEvolvedNft.safeTransferFrom(msg.sender, address(this), nftId);
            zerpmonTrainersEvolvedNftStakes[msg.sender].add(nftId);
        } else if (collection == NftCollection.ZerpmonEquipment) {
            require(address(zerpmonEquipmentNft) != address(0), "Zerpmon Equipment NFT not set");
            zerpmonEquipmentNft.safeTransferFrom(msg.sender, address(this), nftId);
            zerpmonEquipmentNftStakes[msg.sender].add(nftId);
        }

        stakers.add(msg.sender);
        emit Staked(msg.sender, nftId, "Zerpmon NFT");
    }

    /// @notice Function for withdrawing Zerpmon NFTs
    /// @param collection Collection of the Zerpmon NFT
    /// @param nftId ID of the Zerpmon Genesis NFT to withdraw
    /// @dev 0 Zerpmon Genesis, 1 Zerpmon Evolved, 2 Zerpmon Trainers Genesis, 3 Zerpmon Trainers Evolved, 4 Zerpmon Equipment
    function withdrawZerpmonNft(NftCollection collection, uint256 nftId) external nonReentrant {
        if (collection == NftCollection.ZerpmonGenesis) {
            require(zerpmonGenesisNftStakes[msg.sender].contains(nftId), "NFT not staked");
            zerpmonGenesisNftStakes[msg.sender].remove(nftId);
            zerpmonGenesisNft.safeTransferFrom(address(this), msg.sender, nftId);
        } else if (collection == NftCollection.ZerpmonEvolved) {
            require(zerpmonEvolvedNftStakes[msg.sender].contains(nftId), "NFT not staked");
            zerpmonEvolvedNftStakes[msg.sender].remove(nftId);
            zerpmonEvolvedNft.safeTransferFrom(address(this), msg.sender, nftId);
        } else if (collection == NftCollection.ZerpmonTrainersGenesis) {
            require(zerpmonTrainersGenesisNftStakes[msg.sender].contains(nftId), "NFT not staked");
            zerpmonTrainersGenesisNftStakes[msg.sender].remove(nftId);
            zerpmonTrainersGenesisNft.safeTransferFrom(address(this), msg.sender, nftId);
        } else if (collection == NftCollection.ZerpmonTrainersEvolved) {
            require(zerpmonTrainersEvolvedNftStakes[msg.sender].contains(nftId), "NFT not staked");
            zerpmonTrainersEvolvedNftStakes[msg.sender].remove(nftId);
            zerpmonTrainersEvolvedNft.safeTransferFrom(address(this), msg.sender, nftId);
        } else if (collection == NftCollection.ZerpmonEquipment) {
            require(zerpmonEquipmentNftStakes[msg.sender].contains(nftId), "NFT not staked");
            zerpmonEquipmentNftStakes[msg.sender].remove(nftId);
            zerpmonEquipmentNft.safeTransferFrom(address(this), msg.sender, nftId);
        }

        checkAndRemoveStaker(msg.sender);

        emit Withdrawn(msg.sender, nftId, "Zerpmon NFT");
    }

    /// @notice Function to check if a user has any remaining assets staked and remove from stakers list if not
    /// @param staker Address of the staker
    function checkAndRemoveStaker(address staker) internal {
        if (
            xrpZrpLpStakes[staker] == 0 && rootZrpLpStakes[staker] == 0 && zerpmonGenesisNftStakes[staker].length() == 0
                && zerpmonEvolvedNftStakes[staker].length() == 0 && zerpmonTrainersGenesisNftStakes[staker].length() == 0
                && zerpmonTrainersEvolvedNftStakes[staker].length() == 0 && zerpmonEquipmentNftStakes[staker].length() == 0
        ) {
            stakers.remove(staker);
        }
    }

    /// @notice Function to get the list of addresses of all stakers
    function getAllStakers() external view returns (address[] memory) {
        return stakers.values();
    }

    struct StakerAssets {
        uint256 xrpZrpLp;
        uint256 rootZrpLp;
        uint256[] zerpmonGenesisNftIds;
        uint256[] zerpmonEvolvedNftIds;
        uint256[] zerpmonTrainersGenesisNftIds;
        uint256[] zerpmonTrainersEvolvedNftIds;
        uint256[] zerpmonEquipmentNftIds;
    }

    /// @notice Function to get staked assets of a user address
    /// @param staker Address of the staker
    function getStakedAssets(address staker) external view returns (StakerAssets memory) {
        StakerAssets memory assets;
        assets.xrpZrpLp = xrpZrpLpStakes[staker];
        assets.rootZrpLp = rootZrpLpStakes[staker];
        assets.zerpmonGenesisNftIds = zerpmonGenesisNftStakes[staker].values();
        assets.zerpmonEvolvedNftIds = zerpmonEvolvedNftStakes[staker].values();
        assets.zerpmonTrainersGenesisNftIds = zerpmonTrainersGenesisNftStakes[staker].values();
        assets.zerpmonTrainersEvolvedNftIds = zerpmonTrainersEvolvedNftStakes[staker].values();
        assets.zerpmonEquipmentNftIds = zerpmonEquipmentNftStakes[staker].values();

        return assets;
    }

    /// @notice Function to change the XRP/ZRP LP token
    /// @param _xrpZrpLpToken New XRP/ZRP LP token
    function changeXrpZrpLpToken(address _xrpZrpLpToken) external onlyOwner {
        require(address(xrpZrpLpToken) == address(0), "XRP/ZRP LP token already set");
        xrpZrpLpToken = IERC20(_xrpZrpLpToken);
    }

    /// @notice Function to change the ROOT/ZRP LP token
    /// @param _rootZrpLpToken New ROOT/ZRP LP token
    function changeRootZrpLpToken(address _rootZrpLpToken) external onlyOwner {
        require(address(rootZrpLpToken) == address(0), "ROOT/ZRP LP token already set");
        rootZrpLpToken = IERC20(_rootZrpLpToken);
    }

    /// @notice Function to change the Zerpmon Genesis NFT
    /// @param _zerpmonGenesisNft New Zerpmon Genesis NFT
    function changeZerpmonGenesisNft(address _zerpmonGenesisNft) external onlyOwner {
        require(address(zerpmonGenesisNft) == address(0), "Zerpmon Genesis NFT already set");
        zerpmonGenesisNft = IERC721(_zerpmonGenesisNft);
    }

    /// @notice Function to change the Zerpmon Evolved NFT
    /// @param _zerpmonEvolvedNft New Zerpmon Evolved NFT
    function changeZerpmonEvolvedNft(address _zerpmonEvolvedNft) external onlyOwner {
        require(address(zerpmonEvolvedNft) == address(0), "Zerpmon Evolved NFT already set");
        zerpmonEvolvedNft = IERC721(_zerpmonEvolvedNft);
    }

    /// @notice Function to change the Zerpmon Trainers Genesis NFT
    /// @param _zerpmonTrainersGenesisNft New Zerpmon Trainers Genesis NFT
    function changeZerpmonTrainersGenesisNft(address _zerpmonTrainersGenesisNft) external onlyOwner {
        require(address(zerpmonTrainersGenesisNft) == address(0), "Zerpmon Trainers Genesis NFT already set");
        zerpmonTrainersGenesisNft = IERC721(_zerpmonTrainersGenesisNft);
    }

    /// @notice Function to change the Zerpmon Trainers Evolved NFT
    /// @param _zerpmonTrainersEvolvedNft New Zerpmon Trainers Evolved NFT
    function changeZerpmonTrainersEvolvedNft(address _zerpmonTrainersEvolvedNft) external onlyOwner {
        require(address(zerpmonTrainersEvolvedNft) == address(0), "Zerpmon Trainers Evolved NFT already set");
        zerpmonTrainersEvolvedNft = IERC721(_zerpmonTrainersEvolvedNft);
    }

    /// @notice Function to change the Zerpmon Equipment NFT
    /// @param _zerpmonEquipmentNft New Zerpmon Equipment NFT
    function changeZerpmonEquipmentNft(address _zerpmonEquipmentNft) external onlyOwner {
        require(address(zerpmonEquipmentNft) == address(0), "Zerpmon Equipment NFT already set");
        zerpmonEquipmentNft = IERC721(_zerpmonEquipmentNft);
    }

    /// @notice Function to receive ERC721 tokens
    /// @param operator Address which called the function
    /// @param from Address from which the token is transferred
    /// @param tokenId ID of the token
    /// @param data Additional data
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external
        override
        returns (bytes4)
    {
        return this.onERC721Received.selector;
    }
}