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// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.10;

import '../utils/OwnableUpgradeable.sol';
import './OmnuumNFT721.sol';
import './OmnuumCAManager.sol';
import './OmnuumWallet.sol';

/// @title OmnuumMintManager - Manage mint data and logics except ticket minting
/// @author Omnuum Dev Team - <[email protected]>
/// @notice Use only purpose for Omnuum
contract OmnuumMintManager is OwnableUpgradeable {
    uint8 public constant rateDecimal = 5;

    /// @notice minting fee rate
    uint256 public feeRate;

    /// @notice minimum fee (ether)
    uint256 public minFee;

    /// @notice special fee rates for exceptional contracts
    mapping(address => uint256) public specialFeeRates;

    /// @notice nft => groupId => PublicMintSchedule
    mapping(address => mapping(uint256 => PublicMintSchedule)) public publicMintSchedules;

    /// @notice omnuum ca manager address
    address public caManager;

    event ChangeFeeRate(uint256 feeRate);
    event SetSpecialFeeRate(address indexed nftContract, uint256 discountFeeRate);
    event SetMinFee(uint256 minFee);
    event Airdrop(address indexed nftContract, address indexed receiver, uint256 quantity);
    event MintFeePaid(address indexed nftContract, address indexed payer, uint256 profit, uint256 mintFee);
    event SetPublicSchedule(
        address indexed nftContract,
        uint256 indexed groupId,
        uint256 endDate,
        uint256 basePrice,
        uint32 supply,
        uint32 maxMintAtAddress
    );
    event PublicMint(
        address indexed nftContract,
        address indexed minter,
        uint256 indexed groupId,
        uint32 quantity,
        uint32 maxQuantity,
        uint256 price
    );

    struct PublicMintSchedule {
        uint32 supply; // max possible minting amount
        uint32 mintedTotal; // total minted amount
        uint32 maxMintAtAddress; // max possible minting amount per address
        mapping(address => uint32) minted; // minting count per address
        uint256 endDate; // minting schedule end date timestamp
        uint256 basePrice; // minting price
    }

    function initialize(uint256 _feeRate, address _caManager) public initializer {
        __Ownable_init();
        feeRate = _feeRate;
        caManager = _caManager;
        minFee = 0.0005 ether;
    }

    /// @notice get fee rate of given nft contract
    /// @param _nftContract address of nft contract
    function getFeeRate(address _nftContract) public view returns (uint256) {
        return specialFeeRates[_nftContract] == 0 ? feeRate : specialFeeRates[_nftContract];
    }

    /// @notice change fee rate
    /// @param _newFeeRate new fee rate
    function changeFeeRate(uint256 _newFeeRate) external onlyOwner {
        /// @custom:error (NE1) - Fee rate should be lower than 100%
        require(_newFeeRate <= 100000, 'NE1');
        feeRate = _newFeeRate;
        emit ChangeFeeRate(_newFeeRate);
    }

    /// @notice set special fee rate for exceptional case
    /// @param _nftContract address of nft
    /// @param _feeRate fee rate only for nft contract
    function setSpecialFeeRate(address _nftContract, uint256 _feeRate) external onlyOwner {
        /// @custom:error (AE1) - Zero address not acceptable
        require(_nftContract != address(0), 'AE1');

        /// @custom:error (NE1) - Fee rate should be lower than 100%
        require(_feeRate <= 100000, 'NE1');
        specialFeeRates[_nftContract] = _feeRate;
        emit SetSpecialFeeRate(_nftContract, _feeRate);
    }

    function setMinFee(uint256 _minFee) external onlyOwner {
        minFee = _minFee;
        emit SetMinFee(_minFee);
    }

    /// @notice add public mint schedule
    /// @dev only nft contract owner can add mint schedule
    /// @param _nft nft contract address
    /// @param _groupId id of mint schedule
    /// @param _endDate end date of schedule
    /// @param _basePrice mint price of schedule
    /// @param _supply max possible minting amount
    /// @param _maxMintAtAddress max possible minting amount per address
    function setPublicMintSchedule(
        address _nft,
        uint256 _groupId,
        uint256 _endDate,
        uint256 _basePrice,
        uint32 _supply,
        uint32 _maxMintAtAddress
    ) external {
        /// @custom:error (OO1) - Ownable: Caller is not the collection owner
        require(OwnableUpgradeable(_nft).owner() == msg.sender, 'OO1');

        PublicMintSchedule storage schedule = publicMintSchedules[_nft][_groupId];

        schedule.supply = _supply;
        schedule.endDate = _endDate;
        schedule.basePrice = _basePrice;
        schedule.maxMintAtAddress = _maxMintAtAddress;

        emit SetPublicSchedule(_nft, _groupId, _endDate, _basePrice, _supply, _maxMintAtAddress);
    }

    /// @notice before nft mint, check whether mint is possible and count new mint at mint schedule
    /// @dev only nft contract itself can access and use its mint schedule
    /// @param _groupId id of schedule
    /// @param _quantity quantity to mint
    /// @param _value value sent to mint at NFT contract, used for checking whether value is enough or not to mint
    /// @param _minter msg.sender at NFT contract who are trying to mint
    function preparePublicMint(
        uint256 _groupId,
        uint32 _quantity,
        uint256 _value,
        address _minter
    ) external {
        PublicMintSchedule storage schedule = publicMintSchedules[msg.sender][_groupId];

        /// @custom:error (MT8) - Minting period is ended
        require(block.timestamp <= schedule.endDate, 'MT8');

        /// @custom:error (MT5) - Not enough money
        require(schedule.basePrice * _quantity <= _value, 'MT5');

        /// @custom:error (MT2) - Cannot mint more than possible amount per address
        require(schedule.minted[_minter] + _quantity <= schedule.maxMintAtAddress, 'MT2');

        /// @custom:error (MT3) - Remaining token count is not enough
        require(schedule.mintedTotal + _quantity <= schedule.supply, 'MT3');

        schedule.minted[_minter] += _quantity;
        schedule.mintedTotal += _quantity;

        emit PublicMint(msg.sender, _minter, _groupId, _quantity, schedule.supply, schedule.basePrice);
    }

    /// @notice minting multiple nfts, can be used for airdrop
    /// @dev only nft owner can use this function
    /// @param _nftContract address of nft contract
    /// @param _tos list of minting target address
    /// @param _quantitys list of minting quantity which is paired with _tos
    function mintMultiple(
        address payable _nftContract,
        address[] calldata _tos,
        uint256[] calldata _quantitys
    ) external payable {
        OmnuumNFT721 targetContract = OmnuumNFT721(_nftContract);
        uint256 len = _tos.length;

        /// @custom:error (OO1) - Ownable: Caller is not the collection owner
        require(targetContract.owner() == msg.sender, 'OO1');

        /// @custom:error (ARG1) - Arguments length should be same
        require(len == _quantitys.length, 'ARG1');

        uint256 totalQuantity;
        for (uint256 i = 0; i < len; i++) {
            address to = _tos[i];
            uint256 quantity = _quantitys[i];
            totalQuantity += quantity;
            targetContract.mintDirect(to, quantity);
            emit Airdrop(_nftContract, to, quantity);
        }

        /// @custom:error (ARG3) - Not enough ether sent
        require(msg.value >= totalQuantity * minFee, 'ARG3');
        OmnuumWallet(payable(OmnuumCAManager(caManager).getContract('WALLET'))).mintFeePayment{ value: msg.value }(_nftContract);

        emit MintFeePaid(_nftContract, msg.sender, 0, msg.value);
    }

    /// @notice set ca manager
    /// @dev only owner can use this function
    /// @param _caManager address of CA manager
    function setCaManager(address _caManager) external onlyOwner {
        caManager = _caManager;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import '@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';

contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

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

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(tx.origin);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), 'Ownable: caller is not the owner');
        _;
    }

    /**
     * @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);
    }

    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import '@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
import '@openzeppelin/contracts-upgradeable/utils/CountersUpgradeable.sol';
import '../utils/OwnableUpgradeable.sol';
import './SenderVerifier.sol';
import './OmnuumMintManager.sol';
import './OmnuumCAManager.sol';
import './TicketManager.sol';
import './OmnuumWallet.sol';

/// @title OmnuumNFT721 - NFT contract that implements the ERC721 standard
/// @author Omnuum Dev Team - <[email protected]>
/*
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contract OmnuumNFT721 is ERC721Upgradeable, ReentrancyGuardUpgradeable, OwnableUpgradeable {
    using AddressUpgradeable for address;
    using CountersUpgradeable for CountersUpgradeable.Counter;
    CountersUpgradeable.Counter private _tokenIdCounter;

    OmnuumCAManager private caManager;
    OmnuumMintManager private mintManager;

    // @notice OMNUUM deployer address
    address private omnuumSigner;

    /// @notice Maximum supply limit that can be minted
    uint32 public maxSupply;

    /// @notice Revealed or not
    /// @dev The number of reveal is limited to once per NFT contract controlled by RevealManager contract
    bool public isRevealed;
    string public baseURI;

    event BaseURIChanged(address indexed nftContract, string baseURI);
    event MintFeePaid(address indexed nftContract, address indexed payer, uint256 profit, uint256 mintFee);
    event BalanceTransferred(address indexed receiver, uint256 value);
    event EtherReceived(address indexed sender, uint256 value);
    event Revealed(address indexed nftContract);

    /// @notice constructor function for upgradeable
    /// @param _caManagerAddress ca manager address
    /// @param _omnuumSigner Address of Omnuum signer for creating and verifying off-chain ECDSA signature
    /// @param _maxSupply max amount can be minted
    /// @param _coverBaseURI metadata uri for before reveal
    /// @param _prjOwner project owner address to transfer ownership
    /// @param _name NFT name
    /// @param _symbol NFT symbol
    function initialize(
        address _caManagerAddress,
        address _omnuumSigner,
        uint32 _maxSupply,
        string calldata _coverBaseURI,
        address _prjOwner,
        string calldata _name,
        string calldata _symbol
    ) public initializer {
        /// @custom:error (AE1) - Zero address not acceptable
        require(_caManagerAddress != address(0), 'AE1');
        require(_prjOwner != address(0), 'AE1');

        __ERC721_init(_name, _symbol);
        __ReentrancyGuard_init();
        __Ownable_init();

        maxSupply = _maxSupply;
        omnuumSigner = _omnuumSigner;
        baseURI = _coverBaseURI;

        caManager = OmnuumCAManager(_caManagerAddress);
        mintManager = OmnuumMintManager(caManager.getContract('MINTMANAGER'));
    }

    /// @dev See {ERC721Upgradeable}.
    function _baseURI() internal view override returns (string memory) {
        return baseURI;
    }

    /// @notice Allows an owner to change base URI.
    function changeBaseURI(string calldata baseURI_) public onlyOwner {
        baseURI = baseURI_;

        emit BaseURIChanged(address(this), baseURI_);
    }

    /// @notice Returns the total amount of tokens supplied in the contract.
    function totalSupply() public view returns (uint256) {
        return _tokenIdCounter.current();
    }

    /// @notice public minting function
    /// @param _quantity minting quantity
    /// @param _groupId public minting schedule id
    /// @param _payload payload for authenticate that mint call happen through omnuum server to guarantee exact schedule time
    function publicMint(
        uint32 _quantity,
        uint256 _groupId,
        SenderVerifier.Payload calldata _payload
    ) external payable nonReentrant {
        /// @custom:error (MT9) - Minter cannot be CA
        require(!msg.sender.isContract(), 'MT9');

        SenderVerifier(caManager.getContract('VERIFIER')).verify(omnuumSigner, msg.sender, 'MINT', _groupId, _payload);
        mintManager.preparePublicMint(_groupId, _quantity, msg.value, msg.sender);

        payMintFee(_quantity);
        mintLoop(msg.sender, _quantity);
    }

    /// @notice ticket minting function
    /// @param _quantity minting quantity
    /// @param _ticket ticket struct which proves authority to mint
    /// @param _payload payload for authenticate that mint call happen through omnuum server to guarantee exact schedule time
    function ticketMint(
        uint32 _quantity,
        TicketManager.Ticket calldata _ticket,
        SenderVerifier.Payload calldata _payload
    ) external payable nonReentrant {
        /// @custom:error (MT9) - Minter cannot be CA
        require(!msg.sender.isContract(), 'MT9');

        /// @custom:error (MT5) - Not enough money
        require(_ticket.price * _quantity <= msg.value, 'MT5');

        SenderVerifier(caManager.getContract('VERIFIER')).verify(omnuumSigner, msg.sender, 'TICKET', _ticket.groupId, _payload);
        TicketManager(caManager.getContract('TICKET')).useTicket(omnuumSigner, msg.sender, _quantity, _ticket);

        payMintFee(_quantity);
        mintLoop(msg.sender, _quantity);
    }

    /// @notice direct mint, neither public nor ticket
    /// @param _to mint destination address
    /// @param _quantity minting quantity
    function mintDirect(address _to, uint256 _quantity) external {
        /// @custom:error (OO3) - Only Omnuum or owner can change
        require(msg.sender == address(mintManager), 'OO3');
        mintLoop(_to, _quantity);
    }

    /// @notice minting utility function, manage token id
    /// @param _to mint destination address
    /// @param _quantity minting quantity
    function mintLoop(address _to, uint256 _quantity) internal {
        /// @custom:error (MT3) - Remaining token count is not enough
        require(_tokenIdCounter.current() + _quantity <= maxSupply, 'MT3');
        for (uint256 i = 0; i < _quantity; i++) {
            _tokenIdCounter.increment();
            _safeMint(_to, _tokenIdCounter.current());
        }
    }

    /// @notice transfer balance of the contract to address (project team member or else) including project owner him or herself
    /// @param _value The amount of value to transfer
    /// @param _to Receiver who receive the value
    function transferBalance(uint256 _value, address _to) external onlyOwner nonReentrant {
        /// @custom:error (NE4) - Insufficient balance
        require(_value <= address(this).balance, 'NE4');
        (bool withdrawn, ) = payable(_to).call{ value: _value }('');

        /// @custom:error (SE5) - Address: unable to send value, recipient may have reverted
        require(withdrawn, 'SE5');

        emit BalanceTransferred(_to, _value);
    }

    /// @notice a function to donate to support the project owner. Hooray~!
    receive() external payable {
        emit EtherReceived(msg.sender, msg.value);
    }

    /// @notice send fee to omnuum wallet
    /// @param _quantity Mint quantity
    function payMintFee(uint256 _quantity) internal {
        uint8 rateDecimal = mintManager.rateDecimal();
        uint256 minFee = mintManager.minFee();
        uint256 feeRate = mintManager.getFeeRate(address(this));
        uint256 calculatedFee = (msg.value * feeRate) / 10**rateDecimal;
        uint256 minimumFee = _quantity * minFee;

        uint256 feePayment = calculatedFee > minimumFee ? calculatedFee : minimumFee;

        OmnuumWallet(payable(caManager.getContract('WALLET'))).mintFeePayment{ value: feePayment }(address(this));

        emit MintFeePaid(address(this), msg.sender, msg.value - feePayment, feePayment);
    }

    /// @notice can execute only once!!
    /// @dev update reveal flag and update base uri
    /// @param baseURI_ revealed metadata uri
    function setRevealed(string calldata baseURI_) external onlyOwner {
        /// @custom:error (SE6) - Already revealed
        require(!isRevealed, 'SE6');

        isRevealed = true;
        changeBaseURI(baseURI_);

        emit Revealed(address(this));
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.10;

import '@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol';
import '../utils/OwnableUpgradeable.sol';

/// @title OmnuumCAManager - Contract Manager for Omnuum Protocol
/// @author Omnuum Dev Team - <[email protected]>
/// @notice Use only purpose for Omnuum
contract OmnuumCAManager is OwnableUpgradeable {
    using AddressUpgradeable for address;

    struct Contract {
        string topic;
        bool active;
    }

    /// @notice (omnuum contract address => (bytes32 topic => hasRole))
    mapping(address => mapping(string => bool)) public roles;

    /// @notice (omnuum contract address => (topic, active))
    mapping(address => Contract) public managerContracts;

    // @notice topic indexed mapping, (string topic => omnuum contract address)
    mapping(string => address) public indexedContracts;

    event ContractRegistered(address indexed managerContract, string topic);
    event ContractRemoved(address indexed managerContract, string topic);
    event RoleAdded(address indexed ca, string role);
    event RoleRemoved(address indexed ca, string role);

    function initialize() public initializer {
        __Ownable_init();
    }

    /// @notice Add role to multiple addresses
    /// @param _CAs list of contract address which will have specified role
    /// @param _role role name to grant permission
    function addRole(address[] calldata _CAs, string calldata _role) external onlyOwner {
        uint256 len = _CAs.length;

        for (uint256 i = 0; i < len; i++) {
            /// @custom:error (AE2) - Contract address not acceptable
            require(_CAs[i].isContract(), 'AE2');
        }

        for (uint256 i = 0; i < len; i++) {
            roles[_CAs[i]][_role] = true;
            emit RoleAdded(_CAs[i], _role);
        }
    }

    /// @notice Remove role to multiple addresses
    /// @param _CAs list of contract address which will be deprived specified role
    /// @param _role role name to be removed
    function removeRole(address[] calldata _CAs, string calldata _role) external onlyOwner {
        uint256 len = _CAs.length;
        for (uint256 i = 0; i < len; i++) {
            /// @custom:error (NX4) - Non-existent role to CA
            require(roles[_CAs[i]][_role], 'NX4');
            roles[_CAs[i]][_role] = false;
            emit RoleRemoved(_CAs[i], _role);
        }
    }

    /// @notice Check whether target address has role or not
    /// @param _target address to be checked
    /// @param _role role name to be checked with
    /// @return whether target address has specified role or not
    function hasRole(address _target, string calldata _role) public view returns (bool) {
        return roles[_target][_role];
    }

    /// @notice Register multiple addresses at once
    /// @param _CAs list of contract address which will be registered
    /// @param _topics topic list for each contract address
    function registerContractMultiple(address[] calldata _CAs, string[] calldata _topics) external onlyOwner {
        uint256 len = _CAs.length;
        /// @custom:error (ARG1) - Arguments length should be same
        require(_CAs.length == _topics.length, 'ARG1');
        for (uint256 i = 0; i < len; i++) {
            registerContract(_CAs[i], _topics[i]);
        }
    }

    /// @notice Register contract address with topic
    /// @param _CA contract address
    /// @param _topic topic for address
    function registerContract(address _CA, string calldata _topic) public onlyOwner {
        /// @custom:error (AE1) - Zero address not acceptable
        require(_CA != address(0), 'AE1');

        /// @custom:error (AE2) - Contract address not acceptable
        require(_CA.isContract(), 'AE2');

        managerContracts[_CA] = Contract(_topic, true);
        indexedContracts[_topic] = _CA;
        emit ContractRegistered(_CA, _topic);
    }

    /// @notice Check whether contract address is registered
    /// @param _CA contract address
    /// @return isRegistered - boolean
    function checkRegistration(address _CA) public view returns (bool isRegistered) {
        return managerContracts[_CA].active;
    }

    /// @notice Remove contract address
    /// @param _CA contract address which will be removed
    function removeContract(address _CA) external onlyOwner {
        string memory topic = managerContracts[_CA].topic;
        delete managerContracts[_CA];

        if (indexedContracts[topic] == _CA) {
            delete indexedContracts[topic];
        }

        emit ContractRemoved(_CA, topic);
    }

    /// @notice Get contract address for specified topic
    /// @param _topic topic for address
    /// @return address which is registered with topic
    function getContract(string calldata _topic) public view returns (address) {
        return indexedContracts[_topic];
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.10;

/// @title OmnuumWallet Allows multiple owners to agree to withdraw money, add/remove/change owners before execution
/// @notice This contract is not managed by Omnuum admin, but for owners
/// @author Omnuum Dev Team <[email protected]>

import '@openzeppelin/contracts/utils/math/Math.sol';

contract OmnuumWallet {
    /// @notice consensusRatio Ratio of votes to reach consensus as a percentage of total votes
    uint256 public immutable consensusRatio;

    /// @notice Minimum limit of required number of votes for consensus
    uint8 public immutable minLimitForConsensus;

    /// @notice Withdraw = 0
    /// @notice Add = 1
    /// @notice Remove = 2
    /// @notice Change = 3
    /// @notice Cancel = 4
    enum RequestTypes {
        Withdraw,
        Add,
        Remove,
        Change,
        Cancel
    }

    /// @notice F = 0 (F-Level Not owner)
    /// @notice D = 1 (D-Level own 1 vote)
    /// @notice C = 2 (C-Level own 2 votes)
    enum OwnerVotes {
        F,
        D,
        C
    }
    struct OwnerAccount {
        address addr;
        OwnerVotes vote;
    }
    struct Request {
        address requester;
        RequestTypes requestType;
        OwnerAccount currentOwner;
        OwnerAccount newOwner;
        uint256 withdrawalAmount;
        mapping(address => bool) voters;
        uint256 votes;
        bool isExecute;
    }

    Request[] public requests;
    mapping(OwnerVotes => uint8) public ownerCounter;
    mapping(address => OwnerVotes) public ownerVote;

    constructor(
        uint256 _consensusRatio,
        uint8 _minLimitForConsensus,
        OwnerAccount[] memory _initialOwnerAccounts
    ) {
        consensusRatio = _consensusRatio;
        minLimitForConsensus = _minLimitForConsensus;
        for (uint256 i; i < _initialOwnerAccounts.length; i++) {
            OwnerVotes vote = _initialOwnerAccounts[i].vote;
            ownerVote[_initialOwnerAccounts[i].addr] = vote;
            ownerCounter[vote]++;
        }

        _checkMinConsensus();
    }

    event PaymentReceived(address indexed sender, address indexed target, string topic, string description, uint256 value);
    event MintFeeReceived(address indexed nftContract, uint256 value);
    event EtherReceived(address indexed sender, uint256 value);
    event Requested(address indexed owner, uint256 indexed requestId, RequestTypes indexed requestType);
    event Approved(address indexed owner, uint256 indexed requestId, OwnerVotes votes);
    event Revoked(address indexed owner, uint256 indexed requestId, OwnerVotes votes);
    event Canceled(address indexed owner, uint256 indexed requestId);
    event Executed(address indexed owner, uint256 indexed requestId, RequestTypes indexed requestType);

    modifier onlyOwner(address _address) {
        /// @custom:error (004) - Only the owner of the wallet is allowed
        require(isOwner(_address), 'OO4');
        _;
    }

    modifier notOwner(address _address) {
        /// @custom:error (005) - Already the owner of the wallet
        require(!isOwner(_address), 'OO5');
        _;
    }

    modifier isOwnerAccount(OwnerAccount memory _ownerAccount) {
        /// @custom:error (NX2) - Non-existent wallet account
        address _addr = _ownerAccount.addr;
        require(isOwner(_addr) && uint8(ownerVote[_addr]) == uint8(_ownerAccount.vote), 'NX2');
        _;
    }

    modifier onlyRequester(uint256 _reqId) {
        /// @custom:error (OO6) - Only the requester is allowed
        require(requests[_reqId].requester == msg.sender, 'OO6');
        _;
    }

    modifier reachConsensus(uint256 _reqId) {
        /// @custom:error (NE2) - Not reach consensus
        require(requests[_reqId].votes >= requiredVotesForConsensus(), 'NE2');
        _;
    }

    modifier reqExists(uint256 _reqId) {
        /// @custom:error (NX3) - Non-existent owner request
        require(_reqId < requests.length, 'NX3');
        _;
    }

    modifier notExecutedOrCanceled(uint256 _reqId) {
        /// @custom:error (SE1) - Already executed
        require(!requests[_reqId].isExecute, 'SE1');

        /// @custom:error (SE2) - Request canceled
        require(requests[_reqId].requestType != RequestTypes.Cancel, 'SE2');
        _;
    }

    modifier notVoted(address _owner, uint256 _reqId) {
        /// @custom:error (SE3) - Already voted
        require(!isOwnerVoted(_owner, _reqId), 'SE3');
        _;
    }

    modifier voted(address _owner, uint256 _reqId) {
        /// @custom:error (SE4) - Not voted
        require(isOwnerVoted(_owner, _reqId), 'SE4');
        _;
    }

    modifier isValidAddress(address _address) {
        /// @custom:error (AE1) - Zero address not acceptable
        require(_address != address(0), 'AE1');
        uint256 codeSize;
        assembly {
            codeSize := extcodesize(_address)
        }

        /// @notice It's not perfect filtering against CA, but the owners can handle it cautiously.
        /// @custom:error (AE2) - Contract address not acceptable
        require(codeSize == 0, 'AE2');
        _;
    }

    function mintFeePayment(address _nftContract) external payable {
        /// @custom:error (NE3) - A zero payment is not acceptable
        require(msg.value > 0, 'NE3');
        emit MintFeeReceived(_nftContract, msg.value);
    }

    function makePayment(
        address _target,
        string calldata _topic,
        string calldata _description
    ) external payable {
        /// @custom:error (NE3) - A zero payment is not acceptable
        require(msg.value > 0, 'NE3');
        emit PaymentReceived(msg.sender, _target, _topic, _description, msg.value);
    }

    receive() external payable {
        emit EtherReceived(msg.sender, msg.value);
    }

    /// @notice requestOwnerManage
    /// @dev Allows an owner to request for an agenda that wants to proceed
    /// @dev The owner can make multiple requests even if the previous one is unresolved
    /// @dev The requester is automatically voted for the request
    /// @param _requestType Withdraw(0) / Add(1) / Remove(2) / Change(3) / Cancel(4)
    /// @param _currentAccount Tuple[address, OwnerVotes] for current exist owner account (use for Request Type as Remove or Change)
    /// @param _newAccount Tuple[address, OwnerVotes] for new owner account (use for Request Type as Add or Change)

    function requestOwnerManagement(
        RequestTypes _requestType,
        OwnerAccount calldata _currentAccount,
        OwnerAccount calldata _newAccount
    ) external onlyOwner(msg.sender) {
        address requester = msg.sender;

        Request storage request_ = requests.push();
        request_.requester = requester;
        request_.requestType = _requestType;
        request_.currentOwner = OwnerAccount({ addr: _currentAccount.addr, vote: _currentAccount.vote });
        request_.newOwner = OwnerAccount({ addr: _newAccount.addr, vote: _newAccount.vote });
        request_.voters[requester] = true;
        request_.votes = uint8(ownerVote[requester]);

        emit Requested(msg.sender, requests.length - 1, _requestType);
    }

    /// @notice requestWithdrawal
    /// @dev Allows an owner to request withdrawal
    /// @dev The owner can make multiple requests even if the previous one is unresolved
    /// @dev The requester is automatically voted for the request
    /// @param _withdrawalAmount Amount of Ether to be withdrawal (use for Request Type as Withdrawal)
    function requestWithdrawal(uint256 _withdrawalAmount) external onlyOwner(msg.sender) {
        address requester = msg.sender;

        Request storage request_ = requests.push();
        request_.withdrawalAmount = _withdrawalAmount;
        request_.requester = requester;
        request_.requestType = RequestTypes.Withdraw;
        request_.voters[requester] = true;
        request_.votes = uint8(ownerVote[requester]);

        emit Requested(msg.sender, requests.length - 1, RequestTypes.Withdraw);
    }

    /// @notice approve
    /// @dev Allows owners to approve the request
    /// @dev The owner can revoke the approval whenever the request is still in progress (not executed or canceled)
    /// @param _reqId Request id that the owner wants to approve

    function approve(uint256 _reqId)
        external
        onlyOwner(msg.sender)
        reqExists(_reqId)
        notExecutedOrCanceled(_reqId)
        notVoted(msg.sender, _reqId)
    {
        OwnerVotes _vote = ownerVote[msg.sender];
        Request storage request_ = requests[_reqId];
        request_.voters[msg.sender] = true;
        request_.votes += uint8(_vote);

        emit Approved(msg.sender, _reqId, _vote);
    }

    /// @notice revoke
    /// @dev Allow an approver(owner) to revoke the approval
    /// @param _reqId Request id that the owner wants to revoke

    function revoke(uint256 _reqId)
        external
        onlyOwner(msg.sender)
        reqExists(_reqId)
        notExecutedOrCanceled(_reqId)
        voted(msg.sender, _reqId)
    {
        OwnerVotes vote = ownerVote[msg.sender];
        Request storage request_ = requests[_reqId];
        delete request_.voters[msg.sender];
        request_.votes -= uint8(vote);

        emit Revoked(msg.sender, _reqId, vote);
    }

    /// @notice cancel
    /// @dev Allows a requester(owner) to cancel the own request
    /// @dev After proceeding, it cannot revert the cancellation. Be cautious
    /// @param _reqId Request id requested by the requester

    function cancel(uint256 _reqId) external reqExists(_reqId) notExecutedOrCanceled(_reqId) onlyRequester(_reqId) {
        requests[_reqId].requestType = RequestTypes.Cancel;

        emit Canceled(msg.sender, _reqId);
    }

    /// @notice execute
    /// @dev Allow an requester(owner) to execute the request
    /// @dev After proceeding, it cannot revert the execution. Be cautious
    /// @param _reqId Request id that the requester wants to execute

    function execute(uint256 _reqId) external reqExists(_reqId) notExecutedOrCanceled(_reqId) onlyRequester(_reqId) reachConsensus(_reqId) {
        Request storage request_ = requests[_reqId];
        uint8 type_ = uint8(request_.requestType);
        request_.isExecute = true;

        if (type_ == uint8(RequestTypes.Withdraw)) {
            _withdraw(request_.withdrawalAmount, request_.requester);
        } else if (type_ == uint8(RequestTypes.Add)) {
            _addOwner(request_.newOwner);
        } else if (type_ == uint8(RequestTypes.Remove)) {
            _removeOwner(request_.currentOwner);
        } else if (type_ == uint8(RequestTypes.Change)) {
            _changeOwner(request_.currentOwner, request_.newOwner);
        }
        emit Executed(msg.sender, _reqId, request_.requestType);
    }

    /// @notice totalVotes
    /// @dev Allows users to see how many total votes the wallet currently have
    /// @return votes The total number of voting rights the owners have

    function totalVotes() public view returns (uint256 votes) {
        return ownerCounter[OwnerVotes.D] + 2 * ownerCounter[OwnerVotes.C];
    }

    /// @notice isOwner
    /// @dev Allows users to verify registered owners in the wallet
    /// @param _owner Address of the owner that you want to verify
    /// @return isVerified Verification result of whether the owner is correct

    function isOwner(address _owner) public view returns (bool isVerified) {
        return uint8(ownerVote[_owner]) > 0;
    }

    /// @notice isOwnerVoted
    /// @dev Allows users to check which owner voted
    /// @param _owner Address of the owner
    /// @param _reqId Request id that you want to check
    /// @return isVoted Whether the owner voted

    function isOwnerVoted(address _owner, uint256 _reqId) public view returns (bool isVoted) {
        return requests[_reqId].voters[_owner];
    }

    /// @notice requiredVotesForConsensus
    /// @dev Allows users to see how many votes are needed to reach consensus.
    /// @return votesForConsensus The number of votes required to reach a consensus

    function requiredVotesForConsensus() public view returns (uint256 votesForConsensus) {
        return Math.ceilDiv((totalVotes() * consensusRatio), 100);
    }

    /// @notice getRequestIdsByExecution
    /// @dev Allows users to see the array of request ids filtered by execution
    /// @param _isExecuted Whether the request was executed or not
    /// @param _cursorIndex A pointer to a specific request ID that starts in the data list
    /// @param _length The amount of request ids you want to query from the _cursorIndex (not always mean the amount of data you can retrieve)
    /// @return requestIds Array of request ids (if the boundary of search pointer exceeds the length of requests list, it always checks the last request id only, then returns the result)

    function getRequestIdsByExecution(
        bool _isExecuted,
        uint256 _cursorIndex,
        uint256 _length
    ) public view returns (uint256[] memory requestIds) {
        uint256[] memory filteredArray = new uint256[](requests.length);
        uint256 counter = 0;
        uint256 lastReqIdx = getLastRequestNo();
        for (uint256 i = Math.min(_cursorIndex, lastReqIdx); i < Math.min(_cursorIndex + _length, lastReqIdx + 1); i++) {
            if (_isExecuted) {
                if (requests[i].isExecute) {
                    filteredArray[counter] = i;
                    counter++;
                }
            } else {
                if (!requests[i].isExecute) {
                    filteredArray[counter] = i;
                    counter++;
                }
            }
        }
        return _compactUintArray(filteredArray, counter);
    }

    /// @notice getRequestIdsByOwner
    /// @dev Allows users to see the array of request ids filtered by owner address
    /// @param _owner The address of owner
    /// @param _isExecuted If you want to see only for that have not been executed, input this argument into true
    /// @param _cursorIndex A pointer to a specific request ID that starts in the data list
    /// @param _length The amount of request ids you want to query from the _cursorIndex (not always mean the amount of data you can retrieve)
    /// @return requestIds Array of request ids (if the boundary of search pointer exceeds the length of requests list, it always checks the last request id only, then returns the result)

    function getRequestIdsByOwner(
        address _owner,
        bool _isExecuted,
        uint256 _cursorIndex,
        uint256 _length
    ) public view returns (uint256[] memory requestIds) {
        uint256[] memory filteredArray = new uint256[](requests.length);
        uint256 counter = 0;
        uint256 lastReqIdx = getLastRequestNo();
        for (uint256 i = Math.min(_cursorIndex, lastReqIdx); i < Math.min(_cursorIndex + _length, lastReqIdx + 1); i++) {
            if (_isExecuted) {
                if ((requests[i].requester == _owner) && (requests[i].isExecute)) {
                    filteredArray[counter] = i;
                    counter++;
                }
            } else {
                if ((requests[i].requester == _owner) && (!requests[i].isExecute)) {
                    filteredArray[counter] = i;
                    counter++;
                }
            }
        }
        return _compactUintArray(filteredArray, counter);
    }

    /// @notice getRequestIdsByType
    /// @dev Allows users to see the array of request ids filtered by request type
    /// @param _requestType Withdraw(0) / Add(1) / Remove(2) / Change(3) / Cancel(4)
    /// @param _cursorIndex A pointer to a specific request ID that starts in the data list
    /// @param _length The amount of request ids you want to query from the _cursorIndex (not always mean the amount of data you can retrieve)
    /// @return requestIds Array of request ids (if the boundary of search pointer exceeds the length of requests list, it always checks the last request id only, then returns the result)

    function getRequestIdsByType(
        RequestTypes _requestType,
        bool _isExecuted,
        uint256 _cursorIndex,
        uint256 _length
    ) public view returns (uint256[] memory requestIds) {
        uint256[] memory filteredArray = new uint256[](requests.length);
        uint256 counter = 0;
        uint256 lastReqIdx = getLastRequestNo();
        for (uint256 i = Math.min(_cursorIndex, lastReqIdx); i < Math.min(_cursorIndex + _length, lastReqIdx + 1); i++) {
            if (_isExecuted) {
                if ((requests[i].requestType == _requestType) && (requests[i].isExecute)) {
                    filteredArray[counter] = i;
                    counter++;
                }
            } else {
                if ((requests[i].requestType == _requestType) && (!requests[i].isExecute)) {
                    filteredArray[counter] = i;
                    counter++;
                }
            }
        }
        return _compactUintArray(filteredArray, counter);
    }

    /// @notice getLastRequestNo
    /// @dev Allows users to get the last request number
    /// @return requestNo The last request number

    function getLastRequestNo() public view returns (uint256 requestNo) {
        return requests.length - 1;
    }

    /// @notice _withdraw
    /// @dev Withdraw Ethers from the wallet
    /// @param _value Withdraw amount
    /// @param _to Withdrawal recipient

    function _withdraw(uint256 _value, address _to) private {
        /// @custom:error (NE4) - Insufficient balance
        require(_value <= address(this).balance, 'NE4');
        (bool withdrawn, ) = payable(_to).call{ value: _value }('');

        /// @custom:error (SE5) - Address: unable to send value, recipient may have reverted
        require(withdrawn, 'SE5');
    }

    /// @notice _addOwner
    /// @dev Add a new Owner to the wallet
    /// @param _newAccount New owner account to be added

    function _addOwner(OwnerAccount memory _newAccount) private notOwner(_newAccount.addr) isValidAddress(_newAccount.addr) {
        OwnerVotes vote = _newAccount.vote;
        ownerVote[_newAccount.addr] = vote;
        ownerCounter[vote]++;
    }

    /// @notice _removeOwner
    /// @dev Remove existing owner form the wallet
    /// @param _removalAccount Current owner account to be removed

    function _removeOwner(OwnerAccount memory _removalAccount) private isOwnerAccount(_removalAccount) {
        ownerCounter[_removalAccount.vote]--;
        _checkMinConsensus();
        delete ownerVote[_removalAccount.addr];
    }

    /// @notice _changeOwner
    /// @dev Allows changing the existing owner to the new one. It also includes the functionality to change the existing owner's level
    /// @param _currentAccount Current owner account to be changed
    /// @param _newAccount New owner account to be applied

    function _changeOwner(OwnerAccount memory _currentAccount, OwnerAccount memory _newAccount) private {
        OwnerVotes _currentVote = _currentAccount.vote;
        OwnerVotes _newVote = _newAccount.vote;
        ownerCounter[_currentVote]--;
        ownerCounter[_newVote]++;
        _checkMinConsensus();

        if (_currentAccount.addr != _newAccount.addr) {
            delete ownerVote[_currentAccount.addr];
        }
        ownerVote[_newAccount.addr] = _newVote;
    }

    /// @notice _checkMinConsensus
    /// @dev It is the verification function to prevent a dangerous situation in which the number of votes that an owner has
    /// @dev is equal to or greater than the number of votes required for reaching consensus so that the owner achieves consensus by himself or herself.

    function _checkMinConsensus() private view {
        /// @custom:error (NE5) - Violate min limit for consensus
        require(requiredVotesForConsensus() >= minLimitForConsensus, 'NE5');
    }

    function _compactUintArray(uint256[] memory targetArray, uint256 length) internal pure returns (uint256[] memory array) {
        uint256[] memory compactArray = new uint256[](length);
        for (uint256 i = 0; i < length; i++) {
            compactArray[i] = targetArray[i];
        }
        return compactArray;
    }
}

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

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

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

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [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 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

pragma solidity ^0.8.0;

import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.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 ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
    using AddressUpgradeable for address;
    using StringsUpgradeable 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.
     */
    function __ERC721_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC721_init_unchained(name_, symbol_);
    }

    function __ERC721_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
        return
            interfaceId == type(IERC721Upgradeable).interfaceId ||
            interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        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: owner query for nonexistent token");
        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) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        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 overriden 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 = ERC721Upgradeable.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        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: transfer caller is not 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: transfer caller is not 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) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, 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 = ERC721Upgradeable.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(ERC721Upgradeable.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 a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {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 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 IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    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 {}

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[44] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

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

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

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

    uint256 private _status;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

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

// 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 CountersUpgradeable {
    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;
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.10;

import '@openzeppelin/contracts/utils/cryptography/ECDSA.sol';
import '@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol';

/// @title SenderVerifier - verifier contract that payload is signed by omnuum or not
/// @author Omnuum Dev Team - <[email protected]>
contract SenderVerifier is EIP712 {
    constructor() EIP712(SIGNING_DOMAIN, SIGNATURE_VERSION) {}

    string private constant SIGNING_DOMAIN = 'Omnuum';
    string private constant SIGNATURE_VERSION = '1';

    struct Payload {
        address sender; // sender or address who received this payload
        string topic; // topic of payload
        uint256 nonce; // separate same topic payload for multiple steps or checks
        bytes signature; // signature of this payload
    }

    /// @notice verify function
    /// @param _owner address who is believed to be signer of payload signature
    /// @param _sender address who is believed to be target of payload signature
    /// @param _topic topic of payload
    /// @param _nonce nonce of payload
    /// @param _payload payload struct
    function verify(
        address _owner,
        address _sender,
        string calldata _topic,
        uint256 _nonce,
        Payload calldata _payload
    ) public view {
        address signer = recoverSigner(_payload);

        /// @custom:error (VR1) - False Signer
        require(_owner == signer, 'VR1');

        /// @custom:error (VR2) - False Nonce
        require(_nonce == _payload.nonce, 'VR2');

        /// @custom:error (VR3) - False Topic
        require(keccak256(abi.encodePacked(_payload.topic)) == keccak256(abi.encodePacked(_topic)), 'VR3');

        /// @custom:error (VR4) - False Sender
        require(_payload.sender == _sender, 'VR4');
    }

    /// @dev recover signer from payload hash
    /// @param _payload payload struct
    function recoverSigner(Payload calldata _payload) internal view returns (address) {
        bytes32 digest = _hash(_payload);
        return ECDSA.recover(digest, _payload.signature);
    }

    /// @dev hash payload
    /// @param _payload payload struct
    function _hash(Payload calldata _payload) internal view returns (bytes32) {
        return
            _hashTypedDataV4(
                keccak256(
                    abi.encode(
                        keccak256('Payload(address sender,string topic,uint256 nonce)'),
                        _payload.sender,
                        keccak256(bytes(_payload.topic)),
                        _payload.nonce
                    )
                )
            );
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.10;

import '@openzeppelin/contracts/utils/cryptography/ECDSA.sol';
import '@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol';
import '../utils/Ownable.sol';

/// @title TicketManager - manage ticket and verify ticket signature
/// @author Omnuum Dev Team - <[email protected]>
contract TicketManager is EIP712 {
    constructor() EIP712(SIGNING_DOMAIN, SIGNATURE_VERSION) {}

    struct Ticket {
        address user; // owner of this ticket
        address nft; // ticket nft contract
        uint256 price; // price of mint with this ticket
        uint32 quantity; // possible mint quantity
        uint256 groupId; // ticket's group id
        bytes signature; // ticket's signature
    }

    /// @dev nft => groupId => end date
    mapping(address => mapping(uint256 => uint256)) public endDates;

    /// @dev nft => groupId => ticket owner => use count
    mapping(address => mapping(uint256 => mapping(address => uint32))) public ticketUsed;

    string private constant SIGNING_DOMAIN = 'OmnuumTicket';
    string private constant SIGNATURE_VERSION = '1';

    event SetTicketSchedule(address indexed nftContract, uint256 indexed groupId, uint256 endDate);

    event TicketMint(
        address indexed nftContract,
        address indexed minter,
        uint256 indexed groupId,
        uint32 quantity,
        uint32 maxQuantity,
        uint256 price
    );

    /// @notice set end date for ticket group
    /// @param _nft nft contract
    /// @param _groupId id of ticket group
    /// @param _endDate end date timestamp
    function setEndDate(
        address _nft,
        uint256 _groupId,
        uint256 _endDate
    ) external {
        /// @custom:error (OO1) - Ownable: Caller is not the collection owner
        require(Ownable(_nft).owner() == msg.sender, 'OO1');
        endDates[_nft][_groupId] = _endDate;

        emit SetTicketSchedule(_nft, _groupId, _endDate);
    }

    /// @notice use ticket for minting
    /// @param _signer address who is believed to be signer of ticket
    /// @param _minter address who is believed to be owner of ticket
    /// @param _quantity quantity of which minter is willing to mint
    /// @param _ticket ticket
    function useTicket(
        address _signer,
        address _minter,
        uint32 _quantity,
        Ticket calldata _ticket
    ) external {
        verify(_signer, msg.sender, _minter, _quantity, _ticket);

        ticketUsed[msg.sender][_ticket.groupId][_minter] += _quantity;
        emit TicketMint(msg.sender, _minter, _ticket.groupId, _quantity, _ticket.quantity, _ticket.price);
    }

    /// @notice verify ticket
    /// @param _signer address who is believed to be signer of ticket
    /// @param _nft nft contract address
    /// @param _minter address who is believed to be owner of ticket
    /// @param _quantity quantity of which minter is willing to mint
    /// @param _ticket ticket
    function verify(
        address _signer,
        address _nft,
        address _minter,
        uint32 _quantity,
        Ticket calldata _ticket
    ) public view {
        /// @custom:error (MT8) - Minting period is ended
        require(block.timestamp <= endDates[_nft][_ticket.groupId], 'MT8');

        /// @custom:error (VR1) - False Signer
        require(_signer == recoverSigner(_ticket), 'VR1');

        /// @custom:error (VR5) - False NFT
        require(_ticket.nft == _nft, 'VR5');

        /// @custom:error (VR6) - False Minter
        require(_minter == _ticket.user, 'VR6');

        /// @custom:error (MT3) - Remaining token count is not enough
        require(ticketUsed[_nft][_ticket.groupId][_minter] + _quantity <= _ticket.quantity, 'MT3');
    }

    /// @dev recover signer from payload hash
    /// @param _ticket payload struct
    function recoverSigner(Ticket calldata _ticket) internal view returns (address) {
        bytes32 digest = _hash(_ticket);
        return ECDSA.recover(digest, _ticket.signature);
    }

    /// @dev hash payload
    /// @param _ticket payload struct
    function _hash(Ticket calldata _ticket) internal view returns (bytes32) {
        return
            _hashTypedDataV4(
                keccak256(
                    abi.encode(
                        keccak256('Ticket(address user,address nft,uint256 price,uint32 quantity,uint256 groupId)'),
                        _ticket.user,
                        _ticket.nft,
                        _ticket.price,
                        _ticket.quantity,
                        _ticket.groupId
                    )
                )
            );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @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`, 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 be 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 Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

    /**
     * @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;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 IERC721ReceiverUpgradeable {
    /**
     * @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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

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

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
    /**
     * @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);
}

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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @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);
    }
}

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

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

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

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

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

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        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.
            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 if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } 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));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

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

pragma solidity ^0.8.0;

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

    /**
     * @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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a / b + (a % b == 0 ? 0 : 1);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import '@openzeppelin/contracts/utils/Context.sol';

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), 'Ownable: caller is not the owner');
        _;
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), 'Ownable: new owner is the zero address');
        _transferOwnership(newOwner);
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts 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;
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"nftContract","type":"address"},{"indexed":true,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"quantity","type":"uint256"}],"name":"Airdrop","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"feeRate","type":"uint256"}],"name":"ChangeFeeRate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"nftContract","type":"address"},{"indexed":true,"internalType":"address","name":"payer","type":"address"},{"indexed":false,"internalType":"uint256","name":"profit","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"mintFee","type":"uint256"}],"name":"MintFeePaid","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"nftContract","type":"address"},{"indexed":true,"internalType":"address","name":"minter","type":"address"},{"indexed":true,"internalType":"uint256","name":"groupId","type":"uint256"},{"indexed":false,"internalType":"uint32","name":"quantity","type":"uint32"},{"indexed":false,"internalType":"uint32","name":"maxQuantity","type":"uint32"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"}],"name":"PublicMint","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"minFee","type":"uint256"}],"name":"SetMinFee","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"nftContract","type":"address"},{"indexed":true,"internalType":"uint256","name":"groupId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"endDate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"basePrice","type":"uint256"},{"indexed":false,"internalType":"uint32","name":"supply","type":"uint32"},{"indexed":false,"internalType":"uint32","name":"maxMintAtAddress","type":"uint32"}],"name":"SetPublicSchedule","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"nftContract","type":"address"},{"indexed":false,"internalType":"uint256","name":"discountFeeRate","type":"uint256"}],"name":"SetSpecialFeeRate","type":"event"},{"inputs":[],"name":"caManager","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newFeeRate","type":"uint256"}],"name":"changeFeeRate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"getFeeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_feeRate","type":"uint256"},{"internalType":"address","name":"_caManager","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"minFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address payable","name":"_nftContract","type":"address"},{"internalType":"address[]","name":"_tos","type":"address[]"},{"internalType":"uint256[]","name":"_quantitys","type":"uint256[]"}],"name":"mintMultiple","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_groupId","type":"uint256"},{"internalType":"uint32","name":"_quantity","type":"uint32"},{"internalType":"uint256","name":"_value","type":"uint256"},{"internalType":"address","name":"_minter","type":"address"}],"name":"preparePublicMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"publicMintSchedules","outputs":[{"internalType":"uint32","name":"supply","type":"uint32"},{"internalType":"uint32","name":"mintedTotal","type":"uint32"},{"internalType":"uint32","name":"maxMintAtAddress","type":"uint32"},{"internalType":"uint256","name":"endDate","type":"uint256"},{"internalType":"uint256","name":"basePrice","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rateDecimal","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_caManager","type":"address"}],"name":"setCaManager","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_minFee","type":"uint256"}],"name":"setMinFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nft","type":"address"},{"internalType":"uint256","name":"_groupId","type":"uint256"},{"internalType":"uint256","name":"_endDate","type":"uint256"},{"internalType":"uint256","name":"_basePrice","type":"uint256"},{"internalType":"uint32","name":"_supply","type":"uint32"},{"internalType":"uint32","name":"_maxMintAtAddress","type":"uint32"}],"name":"setPublicMintSchedule","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"},{"internalType":"uint256","name":"_feeRate","type":"uint256"}],"name":"setSpecialFeeRate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"specialFeeRates","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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