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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "../interfaces/IOmniseaERC721Psi.sol";
import "../interfaces/IOmniseaERC721.sol";
import "../interfaces/IOmniseaDropsScheduler.sol";
import "../interfaces/IERC2981Royalties.sol";
import {CreateParams, Phase, BasicCollectionParams} from "../structs/erc721/ERC721Structs.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "../ERC721Psi/ERC721Psi.sol";
import "../ERC721Psi/extensions/ERC721PsiAddressData.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract OmniseaERC721Psi is IOmniseaERC721Psi, ERC721PsiAddressData, ReentrancyGuard {
    using Strings for uint256;

    event BatchMinted(address to, uint256 nextTokenId, uint256 quantity);

    modifier onlyOwner() {
        require(owner == msg.sender);
        _;
    }

    IOmniseaDropsScheduler public scheduler;
    address internal immutable _revenueManager = address(0x61104fBe07ecc735D8d84422c7f045f8d29DBf15);
    uint24 public maxSupply;
    string public collectionURI;
    address public override dropsManager;
    bool public isZeroIndexed;
    string public tokensURI;
    uint256 public override endTime;
    uint24 public royaltyAmount;
    bool public isEdition;
    bool public isSBT; // non-transferable token (Soulbound Token)
    address public override owner;
    bool private isInitialized;
    bool private isMintedToPlatform;

    function initialize(
        CreateParams memory params,
        address _owner,
        address _dropsManager,
        address _scheduler
    ) external {
        require(!isInitialized);
        _init(params.name, params.symbol);
        isInitialized = true;
        dropsManager = _dropsManager;
        tokensURI = params.tokensURI;
        maxSupply = params.maxSupply;
        collectionURI = params.uri;
        isZeroIndexed = params.isZeroIndexed;
        endTime = params.endTime;
        isEdition = params.isEdition;
        isSBT = params.isSBT;
        _setNextTokenId(isZeroIndexed ? 0 : 1);
        royaltyAmount = params.royaltyAmount;
        owner = _owner;
        scheduler = IOmniseaDropsScheduler(_scheduler);

        if (params.premintQuantity > 0) {
            require(maxSupply == 0 || maxSupply >= params.premintQuantity, "maxSupply < premintQuantity");
            _mint(_owner, params.premintQuantity);
        }
    }

    function contractURI() public view returns (string memory) {
        return string(abi.encodePacked("ipfs://", collectionURI));
    }

    function tokenURI(uint256 tokenId) public view returns (string memory) {
        if (maxSupply == 0 || isEdition || bytes(tokensURI).length == 0) {
            return contractURI();
        }

        return string(abi.encodePacked("ipfs://", tokensURI, "/", tokenId.toString(), ".json"));
    }

    function mint(address _minter, uint24 _quantity, bytes32[] memory _merkleProof, uint8 _phaseId) external override nonReentrant returns (uint256) {
        require(msg.sender == dropsManager);
        require(isAllowed(_minter, _quantity, _merkleProof, _phaseId), "!isAllowed");
        scheduler.increasePhaseMintedCount(_minter, _phaseId, _quantity);
        _mint(_minter, _quantity);
        emit BatchMinted(_minter, _nextTokenId(), _quantity);

        return _nextTokenId();
    }

    function mintPrice(uint8 _phaseId) public view override returns (uint256) {
        return scheduler.mintPrice(_phaseId);
    }

    function isAllowed(address _account, uint24 _quantity, bytes32[] memory _merkleProof, uint8 _phaseId) internal view returns (bool) {
        require(block.timestamp < endTime);
        if (maxSupply > 0) require(maxSupply >= (totalMinted() + _quantity));

        return scheduler.isAllowed(_account, _quantity, _merkleProof, _phaseId);
    }

    function setPhase(
        uint8 _phaseId,
        uint256 _from,
        uint256 _to,
        bytes32 _merkleRoot,
        uint24 _maxPerAddress,
        uint256 _price,
        address _token,
        uint256 _minToken
    ) external onlyOwner {
        scheduler.setPhase(_phaseId, _from, _to, _merkleRoot, _maxPerAddress, _price, _token, _minToken);
    }

    function setTokensURI(string memory _uri) external onlyOwner {
        require(block.timestamp < endTime);
        tokensURI = _uri;
    }

    function preMintToTeam(uint256 _quantity) external nonReentrant onlyOwner {
        if (maxSupply > 0) {
            require(maxSupply >= totalMinted() + _quantity);
        } else {
            require(block.timestamp < endTime);
        }
        _mint(owner, _quantity);
    }

    function preMintToPlatform(uint256 _quantity) external {
        require(msg.sender == _revenueManager && !isMintedToPlatform && _quantity <= 5);
        if (maxSupply > 0) {
            require(maxSupply >= totalMinted() + _quantity);
        } else {
            require(block.timestamp < endTime);
        }
        isMintedToPlatform = true;
        _mint(_revenueManager, _quantity);
    }

    function _startTokenId() internal view override returns (uint256) {
        return isZeroIndexed ? 0 : 1;
    }

    function royaltyInfo(uint256, uint256 value) external view returns (address _receiver, uint256 _royaltyAmount) {
        _receiver = owner;
        _royaltyAmount = (value * royaltyAmount) / 10000;
    }

    function setRoyaltyAmount(uint24 _royaltyAmount) external onlyOwner {
        royaltyAmount = _royaltyAmount;
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        require(!isSBT, "SBT: transfer not allowed");
        super.transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        require(!isSBT, "SBT: transfer not allowed");
        super.safeTransferFrom(from, to, tokenId, "");
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(!isSBT, "SBT: transfer not allowed");
        super.safeTransferFrom(from, to, tokenId, _data);
    }

    function burn(uint256 tokenId) public virtual {
        require(_isApprovedOrOwner(msg.sender, tokenId));
        _burn(tokenId);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import { CreateParams } from "../structs/erc721/ERC721Structs.sol";

/**
 * @dev Interface of the IOmniseaUniversalONFT: Universal ONFT Core through delegation
 */
interface IOmniseaERC721Psi is IERC165 {
    function initialize(CreateParams memory params, address _owner, address _dropsManagerAddress, address _scheduler) external;
    function mint(address _minter, uint24 _quantity, bytes32[] memory _merkleProof, uint8 _phaseId) external returns (uint256);
    function mintPrice(uint8 _phaseId) external view returns (uint256);
    function owner() external view returns (address);
    function dropsManager() external view returns (address);
    function endTime() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import { BasicCollectionParams } from "../structs/erc721/ERC721Structs.sol";

interface IOmniseaERC721 is IERC721 {
    function initialize(BasicCollectionParams memory _collectionParams, bytes32 _collectionId) external;
    function mint(address owner, uint256 _tokenId, string memory _tokenURI) external;
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function contractURI() external view returns (string memory);
    function tokenURI(uint256 tokenId) external view returns (string memory);
    function totalSupply() external view returns (uint256);
    function circulatingSupply() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import {Phase} from "../structs/erc721/ERC721Structs.sol";

interface IOmniseaDropsScheduler {
    function isAllowed(address _account, uint24 _quantity, bytes32[] memory _merkleProof, uint8 _phaseId) external view returns (bool);
    function setPhase(
        uint8 _phaseId,
        uint256 _from,
        uint256 _to,
        bytes32 _merkleRoot,
        uint24 _maxPerAddress,
        uint256 _price,
        address _token,
        uint256 _minToken
    ) external;
    function increasePhaseMintedCount(address _account,uint8 _phaseId, uint24 _quantity) external;
    function mintPrice(uint8 _phaseId) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface IERC2981Royalties {
    function royaltyInfo(uint256 _tokenId, uint256 _value) external view returns (address _receiver, uint256 _royaltyAmount);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

struct CreateParams {
    string name;
    string symbol;
    string uri;
    string tokensURI;
    uint24 maxSupply;
    bool isZeroIndexed;
    uint24 royaltyAmount;
    uint256 endTime;
    bool isEdition;
    bool isSBT;
    uint256 premintQuantity;
}

struct MintParams {
    address to;
    address collection;
    uint24 quantity;
    bytes32[] merkleProof;
    uint8 phaseId;
    bytes payloadForCall;
}

struct OmnichainMintParams {
    address collection;
    uint24 quantity;
    uint256 paid;
    uint8 phaseId;
    address minter;
}

struct Phase {
    uint256 from;
    uint256 to;
    uint24 maxPerAddress;
    uint256 price;
    bytes32 merkleRoot;
    address token;
    uint256 minToken;
}

    struct BasicCollectionParams {
        uint tokenId;
        string name;
        string symbol;
        string uri;
        string tokenURI;
        address owner;
    }

    struct LzParams {
        uint16 dstChainId;
        address zroPaymentAddress;
        bytes adapterParams;
        address payable refundAddress;
    }

    struct SendParams {
        bytes toAddress;
        address sender;
        address from;
        bytes payloadForCall;
    }

    struct EncodedSendParams {
        bytes toAddress;
        bytes sender;
        bytes from;
        bytes payloadForCall;
    }

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
/**
  ______ _____   _____ ______ ___  __ _  _  _ 
 |  ____|  __ \ / ____|____  |__ \/_ | || || |
 | |__  | |__) | |        / /   ) || | \| |/ |
 |  __| |  _  /| |       / /   / / | |\_   _/ 
 | |____| | \ \| |____  / /   / /_ | |  | |   
 |______|_|  \_\\_____|/_/   |____||_|  |_|   

 - github: https://github.com/estarriolvetch/ERC721Psi
 - npm: https://www.npmjs.com/package/erc721psi
                                          
 */

pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "./solidity-bits/BitMaps.sol";


contract ERC721Psi is ERC165, IERC721 {
    using Strings for uint256;
    using BitMaps for BitMaps.BitMap;

    BitMaps.BitMap private _batchHead;

    string private _name;
    string private _symbol;

    mapping(uint256 => address) internal _owners;
    uint256 private _currentIndex;

    mapping(uint256 => address) private _tokenApprovals;
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;
    bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
        0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;

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

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

    function _setNextTokenId(uint256 _index) internal virtual {
        require(_currentIndex == 0);
        _currentIndex = _index;
    }

    function _nextTokenId() internal view virtual returns (uint256) {
        return _currentIndex;
    }

    function totalMinted() public view virtual returns (uint256) {
        return _currentIndex - _startTokenId();
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC165, IERC165)
        returns (bool)
    {
        return
            interfaceId == type(IERC721).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    function balanceOf(address owner)
        public
        view
        virtual
        override
        returns (uint)
    {
        require(owner != address(0));

        uint count;
        for( uint i = _startTokenId(); i < _nextTokenId(); ++i ){
            if(_exists(i)){
                if( owner == ownerOf(i)){
                    ++count;
                }
            }
        }
        return count;
    }

    function ownerOf(uint256 tokenId)
        public
        view
        virtual
        override
        returns (address)
    {
        (address owner, ) = _ownerAndBatchHeadOf(tokenId);
        return owner;
    }

    function _ownerAndBatchHeadOf(uint256 tokenId) internal view returns (address owner, uint256 tokenIdBatchHead){
        require(_exists(tokenId));
        tokenIdBatchHead = _getBatchHead(tokenId);
        owner = _owners[tokenIdBatchHead];
    }

    function name() public view virtual returns (string memory) {
        return _name;
    }

    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ownerOf(tokenId);
        require(to != owner);

        require(
            msg.sender == owner || isApprovedForAll(owner, msg.sender)
        );

        _approve(to, tokenId);
    }

    function getApproved(uint256 tokenId)
        public
        view
        virtual
        override
        returns (address)
    {
        require(_exists(tokenId));

        return _tokenApprovals[tokenId];
    }

    function setApprovalForAll(address operator, bool approved)
        public
        virtual
        override
    {
        require(operator != msg.sender);

        _operatorApprovals[msg.sender][operator] = approved;
        emit ApprovalForAll(msg.sender, operator, approved);
    }

    function isApprovedForAll(address owner, address operator)
        public
        view
        virtual
        override
        returns (bool)
    {
        return _operatorApprovals[owner][operator];
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        require(_isApprovedOrOwner(msg.sender, tokenId));

        _transfer(from, to, tokenId);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(msg.sender, tokenId));
        _safeTransfer(from, to, tokenId, _data);
    }

    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, 1,_data));
    }

    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return tokenId < _nextTokenId() && _startTokenId() <= tokenId;
    }

    function _isApprovedOrOwner(address spender, uint256 tokenId)
        internal
        view
        virtual
        returns (bool)
    {
        require(_exists(tokenId));
        address owner = ownerOf(tokenId);
        return (spender == owner ||
            getApproved(tokenId) == spender ||
            isApprovedForAll(owner, spender));
    }

    function _safeMint(address to, uint256 quantity) internal virtual {
        _safeMint(to, quantity, "");
    }

    
    function _safeMint(
        address to,
        uint256 quantity,
        bytes memory _data
    ) internal virtual {
        uint256 nextTokenId = _nextTokenId();
        _mint(to, quantity);
        require(_checkOnERC721Received(address(0), to, nextTokenId, quantity, _data));
    }


    function _mint(
        address to,
        uint256 quantity
    ) internal virtual {
        uint256 nextTokenId = _nextTokenId();
        
        require(quantity > 0);
        require(to != address(0));
        
        _beforeTokenTransfers(address(0), to, nextTokenId, quantity);
        _currentIndex += quantity;
        _owners[nextTokenId] = to;
        _batchHead.set(nextTokenId);

        uint256 toMasked;
        uint256 end = nextTokenId + quantity;

        assembly {
            toMasked := and(to, _BITMASK_ADDRESS)
            log4(
                0,
                0,
                _TRANSFER_EVENT_SIGNATURE,
                0,
                toMasked,
                nextTokenId
            )

            for {
                let tokenId := add(nextTokenId, 1)
            } iszero(eq(tokenId, end)) {
                tokenId := add(tokenId, 1)
            } {
                log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId)
            }
        }

        _afterTokenTransfers(address(0), to, nextTokenId, quantity);
    }

    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        (address owner, uint256 tokenIdBatchHead) = _ownerAndBatchHeadOf(tokenId);
        require(owner == from);
        require(to != address(0));

        _beforeTokenTransfers(from, to, tokenId, 1);

        _approve(address(0), tokenId);

        uint256 subsequentTokenId = tokenId + 1;

        if(!_batchHead.get(subsequentTokenId) &&  
            subsequentTokenId < _nextTokenId()
        ) {
            _owners[subsequentTokenId] = from;
            _batchHead.set(subsequentTokenId);
        }

        _owners[tokenId] = to;
        if(tokenId != tokenIdBatchHead) {
            _batchHead.set(tokenId);
        }

        emit Transfer(from, to, tokenId);

        _afterTokenTransfers(from, to, tokenId, 1);
    }

    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ownerOf(tokenId), to, tokenId);
    }

    function _checkOnERC721Received(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity,
        bytes memory _data
    ) private returns (bool r) {
        if (isContract(to)) {
            r = true;
            for(uint256 tokenId = startTokenId; tokenId < startTokenId + quantity; tokenId++){
                try IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data) returns (bytes4 retval) {
                    r = r && retval == IERC721Receiver.onERC721Received.selector;
                } catch (bytes memory reason) {
                    if (reason.length == 0) {
                        revert("non ERC721Receiver");
                    } else {
                        assembly {
                            revert(add(32, reason), mload(reason))
                        }
                    }
                }
            }
            return r;
        } else {
            return true;
        }
    }

    function _getBatchHead(uint256 tokenId) internal view returns (uint256 tokenIdBatchHead) {
        tokenIdBatchHead = _batchHead.scanForward(tokenId); 
    }

    function isContract(address account) internal view returns (bool) {
        return account.code.length > 0;
    }

    function totalSupply() public virtual view returns (uint256) {
        return totalMinted();
    }

    function _beforeTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}

    function _afterTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "../solidity-bits/BitMaps.sol";
import "../ERC721Psi.sol";

abstract contract ERC721PsiAddressData is ERC721Psi {
    mapping(address => AddressData) _addressData;
    using BitMaps for BitMaps.BitMap;
    BitMaps.BitMap private _burnedToken;

    // Compiler will pack this into a single 256bit word.
    struct AddressData {
        uint64 balance;
        uint64 numberMinted;
        uint64 numberBurned;
        uint64 aux;
    }

    function balanceOf(address _owner)
    public
    view
    virtual
    override
    returns (uint)
    {
        return uint256(_addressData[_owner].balance);
    }

    function mintedOf(address _owner)
    public
    view
    virtual
    returns (uint)
    {
        return uint256(_addressData[_owner].numberMinted);
    }

    function _afterTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal override virtual {
        require(quantity < 2 ** 64);
        uint64 _quantity = uint64(quantity);

        if(from != address(0)){
            _addressData[from].balance -= _quantity;
        } else {
            // Mint
            _addressData[to].numberMinted += _quantity;
        }

        if(to != address(0)){
            _addressData[to].balance += _quantity;
        } else {
            // Burn
            _addressData[from].numberBurned += _quantity;
        }
        super._afterTokenTransfers(from, to, startTokenId, quantity);
    }

    /**
     * @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 from = ownerOf(tokenId);
        _beforeTokenTransfers(from, address(0), tokenId, 1);
        _burnedToken.set(tokenId);

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

        _afterTokenTransfers(from, address(0), tokenId, 1);
    }

    /**
     * @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 override virtual returns (bool){
        if(_burnedToken.get(tokenId)) {
            return false;
        }
        return super._exists(tokenId);
    }

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

    /**
     * @dev Returns number of token burned.
     */
    function _burned() internal view returns (uint256 burned){
        uint256 startBucket = _startTokenId() >> 8;
        uint256 lastBucket = (_nextTokenId() >> 8) + 1;

        for(uint256 i=startBucket; i < lastBucket; i++) {
            uint256 bucket = _burnedToken.getBucket(i);
            burned += _popcount(bucket);
        }
    }

    /**
     * @dev Returns number of set bits.
     */
    function _popcount(uint256 x) private pure returns (uint256 count) {
        unchecked{
            for (count=0; x!=0; count++)
                x &= x - 1;
        }
    }
}

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

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

pragma solidity ^0.8.0;

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

// SPDX-License-Identifier: MIT
/**
   _____       ___     ___ __           ____  _ __      
  / ___/____  / (_)___/ (_) /___  __   / __ )(_) /______
  \__ \/ __ \/ / / __  / / __/ / / /  / __  / / __/ ___/
 ___/ / /_/ / / / /_/ / / /_/ /_/ /  / /_/ / / /_(__  ) 
/____/\____/_/_/\__,_/_/\__/\__, /  /_____/_/\__/____/  
                           /____/                        

- npm: https://www.npmjs.com/package/solidity-bits
- github: https://github.com/estarriolvetch/solidity-bits

 */
pragma solidity ^0.8.7;

import "./BitScan.sol";

library BitMaps {
    using BitScan for uint256;
    uint256 private constant MASK_INDEX_ZERO = (1 << 255);
    uint256 private constant MASK_FULL = type(uint256).max;

    struct BitMap {
        mapping(uint256 => uint256) _data;
    }

    function get(BitMap storage bitmap, uint256 index) internal view returns (bool) {
        uint256 bucket = index >> 8;
        uint256 mask = MASK_INDEX_ZERO >> (index & 0xff);
        return bitmap._data[bucket] & mask != 0;
    }

    function set(BitMap storage bitmap, uint256 index) internal {
        uint256 bucket = index >> 8;
        uint256 mask = MASK_INDEX_ZERO >> (index & 0xff);
        bitmap._data[bucket] |= mask;
    }

    function scanForward(BitMap storage bitmap, uint256 index) internal view returns (uint256 setBitIndex) {
        uint256 bucket = index >> 8;

        // index within the bucket
        uint256 bucketIndex = (index & 0xff);

        // load a bitboard from the bitmap.
        uint256 bb = bitmap._data[bucket];

        // offset the bitboard to scan from `bucketIndex`.
        bb = bb >> (0xff ^ bucketIndex); // bb >> (255 - bucketIndex)
        
        if(bb > 0) {
            unchecked {
                setBitIndex = (bucket << 8) | (bucketIndex -  bb.bitScanForward256());    
            }
        } else {
            while(true) {
                require(bucket > 0);
                unchecked {
                    bucket--;
                }
                // No offset. Always scan from the least significiant bit now.
                bb = bitmap._data[bucket];
                
                if(bb > 0) {
                    unchecked {
                        setBitIndex = (bucket << 8) | (255 -  bb.bitScanForward256());
                        break;
                    }
                } 
            }
        }
    }

    function getBucket(BitMap storage bitmap, uint256 bucket) internal view returns (uint256) {
        return bitmap._data[bucket];
    }
}

// SPDX-License-Identifier: MIT
/**
   _____       ___     ___ __           ____  _ __      
  / ___/____  / (_)___/ (_) /___  __   / __ )(_) /______
  \__ \/ __ \/ / / __  / / __/ / / /  / __  / / __/ ___/
 ___/ / /_/ / / / /_/ / / /_/ /_/ /  / /_/ / / /_(__  ) 
/____/\____/_/_/\__,_/_/\__/\__, /  /_____/_/\__/____/  
                           /____/                        

- npm: https://www.npmjs.com/package/solidity-bits
- github: https://github.com/estarriolvetch/solidity-bits

 */

pragma solidity ^0.8.7;


library BitScan {
    uint256 constant private DEBRUIJN_256 = 0x818283848586878898a8b8c8d8e8f929395969799a9b9d9e9faaeb6bedeeff;
    bytes constant private LOOKUP_TABLE_256 = hex"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";

    /**
        @dev Isolate the least significant set bit.
     */ 
    function isolateLS1B256(uint256 bb) pure internal returns (uint256) {
        require(bb > 0);
        unchecked {
            return bb & (0 - bb);
        }
    } 

    /**
        @dev Isolate the most significant set bit.
     */ 
    function isolateMS1B256(uint256 bb) pure internal returns (uint256) {
        require(bb > 0);
        unchecked {
            bb |= bb >> 128;
            bb |= bb >> 64;
            bb |= bb >> 32;
            bb |= bb >> 16;
            bb |= bb >> 8;
            bb |= bb >> 4;
            bb |= bb >> 2;
            bb |= bb >> 1;
            
            return (bb >> 1) + 1;
        }
    } 

    /**
        @dev Find the index of the lest significant set bit. (trailing zero count)
     */ 
    function bitScanForward256(uint256 bb) pure internal returns (uint8) {
        unchecked {
            return uint8(LOOKUP_TABLE_256[(isolateLS1B256(bb) * DEBRUIJN_256) >> 248]);
        }   
    }

    /**
        @dev Find the index of the most significant set bit.
     */ 
    function bitScanReverse256(uint256 bb) pure internal returns (uint8) {
        unchecked {
            return 255 - uint8(LOOKUP_TABLE_256[((isolateMS1B256(bb) * DEBRUIJN_256) >> 248)]);
        }   
    }

    function log2(uint256 bb) pure internal returns (uint8) {
        unchecked {
            return uint8(LOOKUP_TABLE_256[(isolateMS1B256(bb) * DEBRUIJN_256) >> 248]);
        } 
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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