// 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/ERC721/ERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner nor approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @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.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721URIStorage.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev See {ERC721-_burn}. This override additionally checks to see if a
     * token-specific URI was set for the token, and if so, it deletes the token URI from
     * the storage mapping.
     */
    function _burn(uint256 tokenId) internal virtual override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * 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/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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/Counters.sol



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

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.3) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

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



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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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



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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// File: contracts/BrandExtenderSuitUp.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

import "stl-contracts/royalty/DerivedERC2981Royalty.sol";
import "stl-contracts/ERC/ERC5169.sol";

import "stl-contracts/security/VerifyLinkAttestation.sol";
import "stl-contracts/tokens/extensions/SharedHolders.sol";
import "stl-contracts/tokens/extensions/ParentContracts.sol";
import "stl-contracts/tokens/extensions/Minter.sol";
import "stl-contracts/access/UriChanger.sol";
import "stl-contracts/security/VerifySignature.sol";
import "./libs/interfaces.sol";

contract BrandExtenderSuitUp is
    Ownable,
    ERC721struct,
    ERC5169,
    VerifySignature,
    IERC721Enumerable,
    ERC721Enumerable,
    ERC721URIStorage,
    UriChanger,
    DerivedERC2981Royalty,
    SharedHolders,
    ParentContracts,
    Minter
{
    using Strings for uint256;
    using Address for address;

    mapping(uint256 => ERC721s) internal _parents;

    // relation of combined contract_and_id to tokenIds, kind of Enumerable
    mapping(uint256 => uint256[]) internal _childrenArr;
    mapping(uint256 => uint256) internal _childrenIndex;
    mapping(uint256 => uint256) internal _childrenCounter;

    string constant _METADATA_URI = "https://resources.smarttokenlabs.com/";

    address _royaltyReceiver;

    uint256 _mintStartTimestamp;
    uint256 _mintEndTimestamp;

    event BaseUriUpdated(string uri);
    event MintStartUpdated(uint256 timestamp);
    event MintEndUpdated(uint256 timestamp);
    event RoyaltyContractUpdated(address indexed newAddress);
    event PermanentURI(string _value, uint256 indexed _id);
    event MintedDerived(
        address indexed parentContract,
        uint256 indexed parentId,
        uint256 indexed mintedId,
        string tmpUri,
        uint256 currentOriginIndex
    );

    function _authorizeSetScripts(string[] memory) internal override onlyOwner {}

    function _authorizeSetSharedHolder(address[] calldata newAddresses) internal override onlyOwner {}

    function _authorizeAddParent(address newContract) internal override onlyUriChanger {}

    function _authorizeUpdateUriChanger(address newAddress) internal override onlyOwner {}

    // Base URI
    string private __baseURI;

    using Strings for uint256;

    struct MintRequestData {
        address erc721;
        uint256 tokenId;
        uint256 ticketId;
        bytes signature;
        string tokenURI;
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override(ERC721, ERC721Enumerable, Minter) {
        ERC721Enumerable._beforeTokenTransfer(from, to, tokenId);
        Minter._beforeTokenTransfer(from, to, tokenId);
    }

    constructor(
        address _rr,
        address _newUriChanger
    ) ERC721("EDCON2023 Suit Up Collection", "EDCON2023") UriChanger(_newUriChanger) Ownable() {
        updateUriChanger(_newUriChanger);
        _setRoyaltyContract(_rr);

        // TODO set correct roaylty amount
        _setRoyalty(600); // 100 = 1%
    }

    function setRoyalty(uint256 amount) external onlyOwner {
        _setRoyalty(amount);
    }


    function _validateMintRequest(MintRequestData calldata data) internal view returns (bool) {
        address erc721 = data.erc721;
        require(isAllowedParent(data.erc721), "Contract not supported");

        bytes memory toSign = abi.encodePacked(
            address(this),
            msg.sender,
            erc721,
            data.tokenId,
            block.chainid,
            data.ticketId,
            data.tokenURI
        );

        require(verifyEthHash(keccak256(toSign), data.signature) == uriChanger(), "Wrong metadata signer");

        return true;
    }

    function mintDerived(MintRequestData[] calldata data) external virtual {
        uint256 i;
        for (i = 0; i < data.length; i++) {
            require(_validateMintRequest(data[i]), "Invalid mint request");
            _mintDerivedMulti(data[i].erc721, data[i].tokenId, msg.sender, data[i].ticketId);
            emit MintedDerived(
                data[i].erc721,
                data[i].tokenId,
                data[i].ticketId,
                data[i].tokenURI,
                // -1 to show already used value
                tokenOfOriginCounter(data[i].erc721, data[i].tokenId) - 1
            );
        }
    }

    function _mintDerivedMulti(address erc721, uint256 tokenId, address to, uint256 ticketId) internal {
        require(block.timestamp >= _mintStartTimestamp, "Minting has not started");
        if (_mintEndTimestamp > 0) {
            require(block.timestamp <= _mintEndTimestamp, "Minting finished");
        }

        require(_isSharedHolderTokenOwner(erc721, tokenId), "Shared Holder not owner");

        _parents[ticketId] = ERC721s(erc721, tokenId);

        // Get unique 256 bit pointer to specific originating Token (masked address + tokenId)
        uint256 pointer = _getPonter(erc721, tokenId);
        // How many tokens are currently dervied from the specific originating Token
        uint256 newTokenIndex = _childrenCounter[pointer];

        _childrenIndex[ticketId] = _childrenArr[pointer].length;
        _childrenArr[pointer].push(ticketId); // create mapping of derived tokenIds for each originating Token
        _childrenCounter[pointer] = newTokenIndex + 1;

        _safeMint(to, ticketId);
    }

    function contractURI() public pure returns (string memory) {
        return string(abi.encodePacked(_METADATA_URI, "contract/edcon_suitup.json"));
    }

    function _contractAddress() internal view returns (string memory) {
        return Strings.toHexString(uint160(address(this)), 20);
    }

    function tokenURI(uint256 tokenId) public view virtual override(ERC721, ERC721URIStorage) returns (string memory) {
        _requireMinted(tokenId);

        string memory base = baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length > 0) {
            return string(abi.encodePacked(base, "/", tokenId.toString()));
        } else {
            return
                string(
                    abi.encodePacked(
                        _METADATA_URI,
                        block.chainid.toString(),
                        "/",
                        _contractAddress(),
                        "/",
                        tokenId.toString()
                    )
                );
        }
    }

    function baseURI() public view virtual returns (string memory) {
        return _baseURI();
    }

    function _baseURI() internal view override returns (string memory) {
        return __baseURI;
    }

    function setBaseURI(string memory baseURI_) public onlyUriChanger {
        _setBaseURI(baseURI_);
    }

    function _setBaseURI(string memory baseURI_) internal virtual {
        emit BaseUriUpdated(baseURI_);
        __baseURI = baseURI_;
    }

    function setTokenURI(uint256 tokenId, string memory _tokenURI) external onlyUriChanger {
        _setTokenURI(tokenId, _tokenURI);
        emit PermanentURI(_tokenURI, tokenId);
    }

    function setMintStartTime(uint256 timestamp) external onlyOwner {
        _setMintStartTime(timestamp);
    }

    function _setMintStartTime(uint256 timestamp) internal {
        emit MintStartUpdated(timestamp);
        _mintStartTimestamp = timestamp;
    }

    function getMintStartTime() external view returns (uint256) {
        return _mintStartTimestamp;
    }

    function setMintEndTime(uint256 timestamp) external onlyOwner {
        _setMintEndTime(timestamp);
    }

    function _setMintEndTime(uint256 timestamp) internal {
        emit MintEndUpdated(timestamp);
        _mintEndTimestamp = timestamp;
    }

    function getMintEndTime() external view returns (uint256) {
        return _mintEndTimestamp;
    }

    // Form combination of address & tokenId for unique pointer to NFT - Address is 160 bits (20*8) + TokenId 96 bits
    function _getPonter(address c, uint256 tokenId) internal pure returns (uint256) {
        return uint256(keccak256(abi.encodePacked(c, tokenId)));
    }

    function tokenOfOriginByIndex(address erc721, uint256 tokenId, uint256 index) public view returns (uint256) {
        uint256 pointer = _getPonter(erc721, tokenId);
        require(index < _childrenArr[pointer].length, "Index out of bounds");
        return _childrenArr[pointer][index];
    }

    function tokenOfOriginCount(address erc721, uint256 tokenId) public view returns (uint256) {
        uint256 pointer = _getPonter(erc721, tokenId);
        return _childrenArr[pointer].length;
    }

    function tokenOfOriginCounter(address erc721, uint256 tokenId) public view returns (uint256) {
        uint256 pointer = _getPonter(erc721, tokenId);
        return _childrenCounter[pointer];
    }

    // required to solve inheritance
    function _burn(uint256 tokenId) internal virtual override(ERC721, ERC721URIStorage) {
        ERC721s memory parent = getParent(tokenId);
        uint256 pointer = _getPonter(parent.erc721, parent.tokenId);

        uint256 tokenIndex = _childrenIndex[tokenId];

        uint256 lastTokenIndex = _childrenArr[pointer].length - 1;

        //If required, swap the token to be burned and the token at the head of the stack
        //then use pop to remove the head of the _childrenArr stack mapping
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _childrenArr[pointer][lastTokenIndex];

            _childrenArr[pointer][tokenIndex] = lastTokenId;

            _childrenIndex[lastTokenId] = tokenIndex;
        }

        _childrenArr[pointer].pop();
        delete _childrenIndex[tokenId];

        delete _parents[tokenId];
        ERC721URIStorage._burn(tokenId);
    }

    function burn(uint256 tokenId) external {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "Not approved and not owner");
        _burn(tokenId);
    }

    // required to solve inheritance
    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override(ERC5169, IERC165, ERC721, DerivedERC2981Royalty, ERC721Enumerable) returns (bool) {
        return
            interfaceId == type(IERC721Enumerable).interfaceId ||
            ERC721.supportsInterface(interfaceId) ||
            ERC5169.supportsInterface(interfaceId) ||
            DerivedERC2981Royalty.supportsInterface(interfaceId);
    }

    function royaltyInfo(
        uint256 tokenId,
        uint256 salePrice
    ) external view virtual override returns (address receiver, uint256 royaltyAmount) {
        require(_exists(tokenId), "Token doesnt exist.");
        receiver = _royaltyReceiver;
        royaltyAmount = (_getRoyalty() * salePrice) / 10000;
    }

    function setRoyaltyContract(address newAddress) external onlyOwner {
        _setRoyaltyContract(newAddress);
    }

    function _setRoyaltyContract(address newAddress) internal {
        // require(newAddress.isContract(), "Only Contract allowed");
        emit RoyaltyContractUpdated(newAddress);
        _royaltyReceiver = newAddress;
    }

    // function _isTokenOwner(address _contract, uint256 tokenId) internal view returns (bool) {
    //     ERC721 t = ERC721(_contract);
    //     return _msgSender() == t.ownerOf(tokenId);
    // }

    function getParent(uint256 tokenId) public view returns (ERC721s memory) {
        require(_exists(tokenId), "Non-existent token");
        return _parents[tokenId];
    }
}

// File: contracts/libs/interfaces.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

// interface Minter {
//     function getMinter(uint tokenId) external view returns (address);
// }

interface ERC721struct {
    struct ERC721s {
        address erc721;
        uint256 tokenId;
    }
}

// solhint-disable-next-line contract-name-camelcase
interface iMinterAndParent is ERC721struct {
    function getMinterAndParent(uint256 tokenId) external view returns (address minter, address parent);

    function getMinterParentHolder(
        uint256 tokenId
    ) external view returns (address minter, address parent, address holder);

    function getParentNftHolder(uint256 tokenId) external view returns (address holder);
    // function getParent(uint256 tokenId) external view returns(ERC721s memory);
    // function getMinter(uint tokenId) external view returns (address);
}

// File: stl-contracts/access/UriChanger.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./UriChangerBase.sol";

abstract contract UriChanger is UriChangerBase {

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor(address _newUriChanger) {
        _updateUriChanger(_newUriChanger);
    }

}
// File: stl-contracts/access/UriChangerBase.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

abstract contract UriChangerBase {
    address private _uriChanger;

    event UriChangerUpdated(address indexed previousAddress, address indexed newAddress);

    /**
     * @dev Returns the address of the current owner.
     */
    function uriChanger() internal view returns (address) {
        return _uriChanger;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyUriChanger() {
        require(uriChanger() == msg.sender, "UriChanger: caller is not allowed");
        _;
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function updateUriChanger(address newAddress) public virtual {
        _authorizeUpdateUriChanger(newAddress);
        require(newAddress != address(0), "UriChanger: Address required");
        _updateUriChanger(newAddress);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _updateUriChanger(address newAddress) internal virtual {
        address oldAddress = _uriChanger;
        _uriChanger = newAddress;
        emit UriChangerUpdated(oldAddress, newAddress);
    }

    function _authorizeUpdateUriChanger(address newAddress) internal virtual;

}
// File: stl-contracts/ERC/ERC5169.sol



/* Attestation decode and validation */
/* AlphaWallet 2021 - 2022 */
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC5169.sol";

abstract contract ERC5169 is IERC5169 {

    string[] private _scriptURI;
    function scriptURI() external view override returns(string[] memory) {
        return _scriptURI;
    }

    function setScriptURI(string[] memory newScriptURI) external override {
        _authorizeSetScripts(newScriptURI);

        _scriptURI = newScriptURI;

        emit ScriptUpdate(newScriptURI);
    }

    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC5169).interfaceId;
    }

     /**
     * @dev Function that should revert when `msg.sender` is not authorized to set script URI. Called by
     * {setScriptURI}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeSetScripts(string[] memory) internal override onlyOwner {}
     * ```
     */
    function _authorizeSetScripts(string[] memory newScriptURI) internal virtual;
}
// File: stl-contracts/ERC/IERC5169.sol



/* Attestation decode and validation */
/* AlphaWallet 2021 - 2022 */
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IERC5169 {
    /// @dev This event emits when the scriptURI is updated, 
    /// so wallets implementing this interface can update a cached script
    event ScriptUpdate(string[]);

    /// @notice Get the scriptURI for the contract
    /// @return The scriptURI
    function scriptURI() external view returns(string[] memory);

    /// @notice Update the scriptURI 
    /// emits event ScriptUpdate(scriptURI memory newScriptURI);
    function setScriptURI(string[] memory) external;
}

// File: stl-contracts/interfaces/_IERC165.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface _IERC165 {
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: stl-contracts/interfaces/_IERC2981.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./_IERC165.sol";

interface _IERC2981 is _IERC165 {
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);
}

// File: stl-contracts/royalty/DerivedERC2981Royalty.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../interfaces/_IERC2981.sol";

// Max royalty value is 10000 (100%)
abstract contract DerivedERC2981Royalty is _IERC2981 {

    event RoyaltyUpdated(uint256 value);

    uint256 private _royalty;

    function _setRoyalty(uint256 value ) internal {
        require(value <= 10000, "Royalty more that 100%" );
        emit RoyaltyUpdated(value);
        _royalty = value;
    }

    function _getRoyalty() internal view returns(uint256){
        return _royalty;
    }

    /// @dev Support for IERC-2981, royalties
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool)
    {
        return interfaceId == type(_IERC2981).interfaceId;
    }
}
// File: stl-contracts/security/SolRsaVerify.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.5;

library SolRsaVerify {

    bytes19 constant sha256Prefix = 0x3031300d060960864801650304020105000420;

    function memcpy(
        uint256 _dest,
        uint256 _src,
        uint256 _len
    ) internal pure {
        // Copy word-length chunks while possible
        for (; _len >= 32; _len -= 32) {
            assembly {
                mstore(_dest, mload(_src))
            }
            _dest += 32;
            _src += 32;
        }

        if (_len > 0) {
            uint256 mask = 256**(32 - _len) - 1;
            assembly {
                let srcpart := and(mload(_src), not(mask))
                let destpart := and(mload(_dest), mask)
                mstore(_dest, or(destpart, srcpart))
            }
        }
    }

    function join(
        bytes memory _s,
        bytes memory _e,
        bytes memory _m
    ) internal pure returns (bytes memory) {
        uint256 slen = _s.length;
        uint256 elen = _e.length;
        uint256 mlen = _m.length;
        uint256 sptr;
        uint256 eptr;
        uint256 mptr;
        uint256 inputPtr;

        bytes memory input = new bytes(0x60 + slen + elen + mlen);
        assembly {
            sptr := add(_s, 0x20)
            eptr := add(_e, 0x20)
            mptr := add(_m, 0x20)
            mstore(add(input, 0x20), slen)
            mstore(add(input, 0x40), elen)
            mstore(add(input, 0x60), mlen)
            inputPtr := add(input, 0x20)
        }

        memcpy(inputPtr + 0x60, sptr, slen);
        memcpy(inputPtr + 0x60 + slen, eptr, elen);
        memcpy(inputPtr + 0x60 + slen + elen, mptr, mlen);

        return input;
    }

    function sliceUint(bytes memory bs, uint start)
    internal pure
    returns (uint)
    {
        require(bs.length >= start + 32, "slicing out of range");
        uint x;
        assembly {
            x := mload(add(bs, add(0x20, start)))
        }
        return x;
    }

    /** @dev Verifies a PKCSv1.5 SHA256 signature
     * @param _sha256 is the sha256 of the data
     * @param _s is the signature
     * @param _e is the exponent
     * @param _m is the modulus
     * @return 0 if success, >0 otherwise
     */
    function pkcs1Sha256Verify(
        bytes32 _sha256,
        bytes memory _s,
        bytes memory _e,
        bytes memory _m
    ) internal view returns (uint256) {
        uint256 decipherlen = _m.length;
        require(decipherlen >= 62); // _m.length >= sha256Prefix.length + _sha256.length + 11 = 19 + 32 + 11 = 62
        // decipher
        bytes memory input = join(_s, _e, _m);  //
        // return 0;
        uint256 inputlen  = input.length;

        bytes memory decipher = new bytes(decipherlen);

        // cp0;

        assembly {
            pop(staticcall(sub(gas(), 2000), 0x05, add(input, 0x20), inputlen, add(decipher, 0x20), decipherlen))
        }

        // optimized for 1024 bytes
        if (
            sliceUint(decipher, 0 )    != 0x0001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
            || uint(sliceUint(decipher, 13))    != 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 
            || uint(sliceUint(decipher, 13+32)) != 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00 
            
            ) {
            return 1;
        }

        // or uncomment for other than 1024 (start)
        // if (uint8(decipher[0]) != 0 || uint8(decipher[1]) != 1) {
        //     return 1;
        // }

        // uint256 i;
        
        // for (i = 2; i < decipherlen - 52; i++) {
        //     if (decipher[i] != 0xff) {
        //         return 2;
        //     }
        // }

        // if (decipher[decipherlen - 52] != 0) {
        //     return 3;
        // }
        // or uncomment for other than 1024 (end)

        if (uint(bytes32(sha256Prefix)) != sliceUint(decipher, decipherlen - 51) & 0xffffffffffffffffffffffffffffffffffffff00000000000000000000000000){
            return 4;
        }

        if (uint256(_sha256) != sliceUint(decipher,decipherlen - 32)){
            return 5;
        }
        return 0;
    }

    /** @dev Verifies a PKCSv1.5 SHA256 signature
     * @param _data to verify
     * @param _s is the signature
     * @param _e is the exponent
     * @param _m is the modulus
     * @return 0 if success, >0 otherwise
     */
    function pkcs1Sha256VerifyRaw(
        bytes memory _data,
        bytes memory _s,
        bytes memory _e,
        bytes memory _m
    ) internal view returns (uint256) {
        return pkcs1Sha256Verify(sha256(_data), _s, _e, _m);
    }
}

// File: stl-contracts/security/VerifyLinkAttestation.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "./SolRsaVerify.sol";

library VerifyLinkAttestation {
    using ECDSA for bytes32;

    function verifyAddressAttestation(bytes memory attestation, address attestorAddr) internal view returns (address attestedAddress) {
        address linkedAddress;

        (attestedAddress, linkedAddress) = decodeAttestation(attestation, attestorAddr);

        if (msg.sender != linkedAddress){
            revert("Linked address not eq sender");
        }
    }

    function decodeAttestation(bytes memory attestation, address attestorAddr)
        internal
        view
        returns (address attestedAddress, address linkedAddress)
    {
        uint256 length;
        uint256 hashIndex;
        uint256 decodeIndex;

        bytes memory curBytes;
        bytes memory sigData;

        bytes memory pubKeyModulus;
        bytes memory pubKeyExponent;

        // Main header (Signed link attestation)
        // (length, hashIndex, ) = decodeLength(attestation, 0); // (total length, primary header)
        (, hashIndex, ) = decodeLength(attestation, 0); // (total length, primary header)

        // Link attestation structure
        (length, decodeIndex, ) = decodeLength(attestation, hashIndex);

        bytes memory linkEncoded = copyDataBlock(attestation, hashIndex, (length + decodeIndex) - hashIndex); // Encoded data for link attestation

        (length, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // linked ethereum address

        linkedAddress = bytesToAddress(curBytes);

        (, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // Linked attestation


        (attestedAddress, pubKeyModulus, pubKeyExponent) = decodeAddressAttestation(curBytes, attestorAddr);

        (, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // validity

        validateExpiry(curBytes);

        // TODO: Check for context field
        //(length, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // context

        (, decodeIndex, ) = decodeLength(attestation, decodeIndex); // object identifier
        (, , decodeIndex, ) = decodeElement(attestation, decodeIndex);

        (, sigData, decodeIndex) = decodeElementOffset(attestation, decodeIndex, 1); // Signature


        if (SolRsaVerify.pkcs1Sha256VerifyRaw(linkEncoded, sigData, pubKeyExponent, pubKeyModulus) != 0) {
            revert("RSA verification failed :-(");
        }
    }

    function decodeAddressAttestation(bytes memory attestation, address attestorAddr)
        internal
        view
        returns (
            address attestedAddress,
            bytes memory pubKeyModulus,
            bytes memory pubKeyExponent
        )
    {
        uint256 length;
        uint256 hashIndex;
        uint256 decodeIndex;

        bytes memory curBytes;
        bytes memory sigData;

        (, hashIndex, ) = decodeLength(attestation, 0); // (total length, primary header)


        // Address attestation structure
        (length, decodeIndex, ) = decodeLength(attestation, hashIndex);

        bytes memory addressEncoded = copyDataBlock(attestation, hashIndex, (length + decodeIndex) - hashIndex); // Encoded data for address attestation

        (, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // subject public key (public key of link attestation signature)


        (pubKeyModulus, pubKeyExponent) = decodeRsaPublicKey(curBytes);

        (, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // Attested ethereum address

        attestedAddress = bytesToAddress(curBytes);


        (, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // validity

        validateExpiry(curBytes);

        // TODO: Check for context field
        //(length, curBytes, decodeIndex, ) = decodeElement(attestation, decodeIndex); // context


        (, decodeIndex, ) = decodeLength(attestation, decodeIndex); // Algorithm info
        (, , decodeIndex, ) = decodeElement(attestation, decodeIndex);

        (, sigData, decodeIndex) = decodeElementOffset(attestation, decodeIndex, 1); // Signature

        address recoveredAddress = keccak256(addressEncoded).recover(sigData);

        if (recoveredAddress != attestorAddr) {
            revert("Wrong Attestor");
        }
    }

    function validateExpiry(bytes memory validity) internal view {

        uint256 length = 0;
        uint256 decodeIndex = 0;
        bytes memory curBytes;

        (length, curBytes, decodeIndex,) = decodeElement(validity, decodeIndex);

        uint from = bytesToUint(curBytes);

        (length, curBytes, decodeIndex,) = decodeElement(validity, decodeIndex);

        uint to = bytesToUint(curBytes);

        require(block.timestamp > from, "Attestation not yet valid");
        require(block.timestamp < to, "Attestation expired");
    }

    function decodeRsaPublicKey(bytes memory asnEncoded) internal pure returns (bytes memory modulus, bytes memory exponent) {
        uint256 decodeIndex;
        bytes memory curBytes;

        // (length, curBytes, decodeIndex, ) = decodeElement(asnEncoded, decodeIndex); // Skip algorithm ID
        // (length, curBytes, decodeIndex) = decodeElementOffset(asnEncoded, decodeIndex, 1);
        (, , decodeIndex, ) = decodeElement(asnEncoded, decodeIndex); // Skip algorithm ID
        (, curBytes, decodeIndex) = decodeElementOffset(asnEncoded, decodeIndex, 1);

        decodeIndex = 0;
        // bytes memory parts = curBytes;

        // (length, decodeIndex, ) = decodeLength(parts, decodeIndex);
        (, decodeIndex, ) = decodeLength(curBytes, decodeIndex);

        // (length, modulus, decodeIndex) = decodeElementOffset(parts, decodeIndex, 1);
        (, modulus, decodeIndex) = decodeElementOffset(curBytes, decodeIndex, 1);

        // (length, exponent, decodeIndex, ) = decodeElement(parts, decodeIndex);
        (, exponent, , ) = decodeElement(curBytes, decodeIndex);
    }

    // TODO: Is this more gas efficient compared to using open-zeppelin EDCSA?
    /*function recoverSigner(bytes memory prehash, bytes memory signature) internal pure returns(address signer)
    {
        (bytes32 r, bytes32 s, uint8 v) = splitSignature(signature);

        return ecrecover(keccak256(prehash), v, r, s);
    }

    function splitSignature(bytes memory sig)
    internal pure returns (bytes32 r, bytes32 s, uint8 v)
    {
        require(sig.length == 65, "invalid signature length");

        assembly {

        // first 32 bytes, after the length prefix
            r := mload(add(sig, 32))
        // second 32 bytes
            s := mload(add(sig, 64))
        // final byte (first byte of the next 32 bytes)
            v := byte(0, mload(add(sig, 96)))
        }
    }*/

    function bytesToAddress(bytes memory bys) private pure returns (address addr) {
        assembly {
            addr := mload(add(bys, 20))
        }
    }

    //Truncates if input is greater than 32 bytes; we only handle 32 byte values.
    function bytesToUint(bytes memory b) public pure returns (uint256 conv)
    {
        if (b.length < 0x20) //if b is less than 32 bytes we need to pad to get correct value
        {
            bytes memory b2 = new bytes(32);
            uint startCopy = 0x20 + 0x20 - b.length;
            assembly
            {
                let bcc := add(b, 0x20)
                let bbc := add(b2, startCopy)
                mstore(bbc, mload(bcc))
                conv := mload(add(b2, 32))
            }
        }
        else
        {
            assembly
            {
                conv := mload(add(b, 32))
            }
        }
    }

    //////////////////////////////////////////////////////////////
    // DER Helper functions
    //////////////////////////////////////////////////////////////

    function decodeDERData(bytes memory byteCode, uint256 dIndex)
        internal
        pure
        returns (
            bytes memory data,
            uint256 index,
            uint256 length,
            bytes1 tag
        )
    {
        return decodeDERData(byteCode, dIndex, 0);
    }

    function copyDataBlock(
        bytes memory byteCode,
        uint256 dIndex,
        uint256 length
    ) internal pure returns (bytes memory data) {
        // uint256 blank;
        // uint256 index = dIndex;

        // uint256 dStart = 0x20 + dIndex;
        uint256 cycles = length / 0x20;
        uint256 requiredAlloc = length;

        if (length % 0x20 > 0) //optimise copying the final part of the bytes - remove the looping
        {
            cycles++;
            requiredAlloc += 0x20; //expand memory to allow end blank
        }

        data = new bytes(requiredAlloc);

        assembly {
            let mc := add(data, 0x20) //offset into bytes we're writing into
            let cycle := 0

            for {
                let cc := add(byteCode, add(0x20, dIndex))
            } lt(cycle, cycles) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
                cycle := add(cycle, 0x01)
            } {
                mstore(mc, mload(cc))
            }
        }

        //finally blank final bytes and shrink size
        if (length % 0x20 > 0) {
            uint256 offsetStart = 0x20 + length;
            assembly {
                let mc := add(data, offsetStart)
                // mstore(mc, mload(add(blank, 0x20)))
                mstore(mc, mload(0x20))
                //now shrink the memory back
                mstore(data, length)
            }
        }
    }

    function decodeDERData(
        bytes memory byteCode,
        uint256 dIndex,
        uint256 offset
    )
        internal
        pure
        returns (
            bytes memory data,
            uint256 index,
            uint256 length,
            bytes1 tag
        )
    {
        // index = dIndex;

        // (length, index, tag) = decodeLength(byteCode, index);

        (length, index, tag) = decodeLength(byteCode, dIndex);

        if (offset <= length) {
            // uint256 requiredLength = length - offset;
            // uint256 dStart = index + offset;

            // data = copyDataBlock(byteCode, dStart, requiredLength);
            data = copyDataBlock(byteCode, index + offset, length - offset);
        } else {
            data = bytes("");
        }

        index += length;
    }

    function decodeElement(bytes memory byteCode, uint256 decodeIndex)
        internal
        pure
        returns (
            uint256 length,
            bytes memory content,
            uint256 newIndex,
            bytes1 tag
        )
    {
        (content, newIndex, length, tag) = decodeDERData(byteCode, decodeIndex);
    }

    function decodeElementOffset(
        bytes memory byteCode,
        uint256 decodeIndex,
        uint256 offset
    )
        internal
        pure
        returns (
            uint256 length,
            bytes memory content,
            uint256 newIndex
        )
    {
        (content, newIndex, length, ) = decodeDERData(byteCode, decodeIndex, offset);
    }

    function decodeLength(bytes memory byteCode, uint256 decodeIndex)
        internal
        pure
        returns (
            uint256 length,
            uint256 newIndex,
            bytes1 tag
        )
    {
        uint256 codeLength = 1;
        // length = 0;
        newIndex = decodeIndex;
        tag = bytes1(byteCode[newIndex++]);

        if ((byteCode[newIndex] & 0x80) == 0x80) {
            codeLength = uint8((byteCode[newIndex++] & 0x7f));
        }

        for (uint256 i = 0; i < codeLength; i++) {
            length |= uint256(uint8(byteCode[newIndex++] & 0xFF)) << ((codeLength - i - 1) * 8);
        }
    }

    function decodeIA5String(
        bytes memory byteCode,
        uint256[] memory objCodes,
        uint256 objCodeIndex,
        uint256 decodeIndex
    ) internal pure returns (Status memory) {
        uint256 length = uint8(byteCode[decodeIndex++]);
        bytes32 store = 0;
        for (uint256 j = 0; j < length; j++) store |= bytes32(byteCode[decodeIndex++] & 0xFF) >> (j * 8);
        objCodes[objCodeIndex++] = uint256(store);
        Status memory retVal;
        retVal.decodeIndex = decodeIndex;
        retVal.objCodeIndex = objCodeIndex;

        return retVal;
    }

    struct Status {
        uint256 decodeIndex;
        uint256 objCodeIndex;
    }
}

// File: stl-contracts/security/VerifySignature.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
// import "@openzeppelin/contracts/utils/Strings.sol";

contract VerifySignature {
    using ECDSA for bytes32;
    
    // use this function to get the hash of any string
    function getHash(string memory str) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(str));
    }
    
    // take the keccak256 hashed message from the getHash function above and input into this function
    // this function prefixes the hash above with \x19Ethereum signed message:\n32 + hash
    // and produces a new hash signature
    function getEthSignedHash(bytes32 _messageHash) public pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", _messageHash));
    }

    function getEthMsgdHash(string memory message) public pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", bytes(message).length ,message));
    }

    function getEthBytesHash(bytes memory data) public pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", data.length ,data));
    }
    
    // input the getEthSignedHash results and the signature hash results
    // the output of this function will be the account number that signed the original message
    function verify(bytes32 _ethSignedMessageHash, bytes memory _signature) public pure returns (address) {
        (address recovered,) = _ethSignedMessageHash.tryRecover(_signature);
        return recovered;
    }

    function verifyStringSign(string memory _msg, bytes memory _signature) public pure returns (address) {
        bytes32 msgHash = keccak256(abi.encodePacked(_msg));
        
        return verify(msgHash, _signature);
    }

    // verify messages, signed by ethereum wallet
    function verifyEthString(string memory _msg, bytes memory _signature) public pure returns (address) {
        return verify(getEthMsgdHash(_msg), _signature);
    }

    function verifyEthHash(bytes32 _hash, bytes memory _signature) public pure returns (address) {
        return verify(getEthSignedHash(_hash), _signature);
    }

    function verifyEthBytes(bytes memory _data, bytes memory _signature) public pure returns (address) {
        return verify(getEthBytesHash(_data), _signature);
    }
}  
// File: stl-contracts/tokens/extensions/Minter.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.5;

contract Minter {

    mapping(uint => address) private minter;

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        if (to == address(0) && from != address(0)){
            delete minter[tokenId];
        }

        if ( from == address(0)){
            minter[tokenId] = to;
        }

    }

    function getMinter(uint tokenId) public view returns (address) {
        address _minter = minter[tokenId];
        require (_minter != address(0), "Not minted");
        return _minter;
    }

}
// File: stl-contracts/tokens/extensions/ParentContracts.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

abstract contract ParentContracts {

    using Address for address;

    // save as array to be able to foreach parents
    address[] private allowedParentsArray;

    mapping(address => uint) private allowedParents;

    event ParentAdded(address indexed newERC721);

    function _authorizeAddParent(address newContract) internal virtual;

    // array of ERC721 contracts to be parents to mint derived NFT 
    function getParents() public view virtual returns(address[] memory) {
        return allowedParentsArray;
    }

    function addParent(address newContract) public {

        _authorizeAddParent( newContract);

        require(newContract.isContract(), "Must be contract");

        IERC721 c = IERC721(newContract);

        try c.supportsInterface(type(IERC721).interfaceId) returns (bool result) {
            if (!result){
                revert("Must be ERC721 contract");
            }
        } catch {
            // emit Log("external call failed");
            revert("Must be ERC721 contract");
        }

        // require(c.supportsInterface(type(IERC721).interfaceId), "Must be ERC721 contract");

        require(allowedParents[newContract] == 0, "Already added");
        allowedParentsArray.push(newContract);
        allowedParents[newContract] = allowedParentsArray.length;
        emit ParentAdded(newContract);

    }

    function isAllowedParent(address _contract) internal view returns (bool){
        return allowedParents[_contract] > 0;
    }

}
// File: stl-contracts/tokens/extensions/SharedHolders.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

abstract contract SharedHolders {

    address[] sharedTokenHolders;

    event SharedTokenHoldersUpdated(address[] newAddresses);

    function _authorizeSetSharedHolder(address[] calldata newAddresses) internal virtual;

    // SharedTokenHolder - some STL address, which holds popular NFTs, 
    // contract allowed to mint derived NFTs for NFTs, owned by this token
    function setSharedTokenHolders(address[] calldata newAddresses) external {
        _authorizeSetSharedHolder(newAddresses);

        emit SharedTokenHoldersUpdated(newAddresses);
        sharedTokenHolders = newAddresses;
    }

    function _isSharedHolderTokenOwner(address _contract, uint256 tokenId) internal view returns (bool) {
        ERC721 t = ERC721(_contract);
        address nftOwner = t.ownerOf(tokenId);
        uint length = sharedTokenHolders.length;
        for (uint i=0; i<length; i++){
            if (sharedTokenHolders[i] == nftOwner){
                return true;
            }
        }
        return false;
    }

    function hasSharedTokenHolders() internal view returns (bool){
        return sharedTokenHolders.length > 0;
    }

}