MintNFT.sol

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

import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721EnumerableUpgradeable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/metatx/MinimalForwarderUpgradeable.sol";
import "./lib/Hashing.sol";
import "./ERC2771ContextUpgradeable.sol";
import "./IEvent.sol";
import "./ISecretPhraseVerifier.sol";
import "./IOperationController.sol";

contract MintNFT is
    ERC721EnumerableUpgradeable,
    ERC2771ContextUpgradeable,
    OwnableUpgradeable
{
    using Counters for Counters.Counter;
    Counters.Counter private _tokenIds;

    address private eventManagerAddr;

    function setEventManagerAddr(address _addr) public onlyOwner {
        require(_addr != address(0), "event manager address is blank");
        eventManagerAddr = _addr;
    }

    struct NFTAttribute {
        string metaDataURL;
        uint256 requiredParticipateCount;
    }
    struct NFTHolder {
        address holderAddress;
        uint256 tokenId;
    }
    struct NFTHolderWithEventId {
        address holderAddress;
        uint256 eventId;
        uint256 tokenId;
    }

    struct TokenUriWithIds {
        uint256 eventId;
        uint256 tokenId;
        string tokenUri;
    }

    // NFT meta data url via tokenId
    mapping(uint256 => string) private nftMetaDataURL;
    // Holding NFT via hash of eventId and address
    mapping(bytes32 => bool) private isHoldingEventNFT;
    // Participate count via hash of groupId and address hash
    mapping(bytes32 => uint256) private countOfParticipation;
    // NFT attribute location (ex. ipfs, centralized storage) via hash of participateCount, eventId
    mapping(bytes32 => string) private eventNftAttributes;
    // remaining mint count of Event
    mapping(uint256 => uint256) private remainingEventNftCount;
    // secretPhrase via EventId
    mapping(uint256 => bytes32) private eventSecretPhrases;
    // is mint locked via EventId
    mapping(uint256 => bool) private isMintLocked;
    address private secretPhraseVerifierAddr;
    // Create a mapping to store NFT holders by event ID
    mapping(uint256 => uint256[]) private tokenIdsByEvent;
    address private operationControllerAddr;
    // Create a mapping to store event ID by token ID
    mapping(uint256 => uint256) private eventIdOfTokenId;
    // is non transferable via EventId
    mapping(uint256 => bool) private isNonTransferable;

    event MintedNFTAttributeURL(address indexed holder, string url);
    event MintLocked(uint256 indexed eventId, bool isLocked);
    event ResetSecretPhrase(address indexed executor, uint256 indexed eventId);
    event NonTransferable(uint256 indexed eventId, bool isNonTransferable);
    event DroppedNFTs(address indexed executor, uint256 indexed eventId);

    modifier onlyCollaboratorAccess(uint256 _eventId) {
        IEventManager eventManager = IEventManager(eventManagerAddr);
        require(
            eventManager.hasCollaboratorAccessByEventId(_msgSender(), _eventId),
            "you have no permission"
        );
        _;
    }

    modifier whenNotPaused() {
        IOperationController operationController = IOperationController(
            operationControllerAddr
        );
        require(!operationController.paused());
        _;
    }

    // Currently, reinitializer(5) was executed as constructor.
    function initialize(
        address _owner,
        MinimalForwarderUpgradeable _trustedForwarder,
        address _secretPhraseVerifierAddr,
        address _operationControllerAddr
    ) public reinitializer(5) {
        __ERC721_init("MintRally", "MR");
        __Ownable_init();
        _transferOwnership(_owner);
        __ERC2771Context_init(address(_trustedForwarder));
        secretPhraseVerifierAddr = _secretPhraseVerifierAddr;
        operationControllerAddr = _operationControllerAddr;
    }

    function _msgSender()
        internal
        view
        virtual
        override(ContextUpgradeable, ERC2771ContextUpgradeable)
        returns (address sender)
    {
        if (isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            /// @solidity memory-safe-assembly
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 20)))
            }
        } else {
            return super._msgSender();
        }
    }

    function _msgData()
        internal
        view
        virtual
        override(ContextUpgradeable, ERC2771ContextUpgradeable)
        returns (bytes calldata)
    {
        if (isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 20];
        } else {
            return super._msgData();
        }
    }

    function mintParticipateNFT(
        uint256 _groupId,
        uint256 _eventId,
        uint256[24] memory _proof
    ) external whenNotPaused {
        canMint(_eventId, _proof);

        ISecretPhraseVerifier secretPhraseVerifier = ISecretPhraseVerifier(
            secretPhraseVerifierAddr
        );
        secretPhraseVerifier.submitProof(_proof, _eventId);
        _mintNFT(_groupId, _eventId, _msgSender());
    }

    function dropNFTs(
        uint256 _eventId,
        address[] memory _addresses
    ) external onlyCollaboratorAccess(_eventId) whenNotPaused {
        uint256 groupId = getGroupIdByEvent(_eventId);
        require(
            remainingEventNftCount[_eventId] >= _addresses.length,
            "remaining count is not enough"
        );
        for (uint256 index = 0; index < _addresses.length; index++) {
            address addr = _addresses[index];
            if (!isHoldingEventNFTByAddress(addr, _eventId)) {
                _mintNFT(groupId, _eventId, addr);
            }
        }
        emit DroppedNFTs(_msgSender(), _eventId);
    }

    function _mintNFT(
        uint256 _groupId,
        uint256 _eventId,
        address _address
    ) internal {
        remainingEventNftCount[_eventId] = remainingEventNftCount[_eventId] - 1;
        isHoldingEventNFT[
            Hashing.hashingAddressUint256(_address, _eventId)
        ] = true;

        bytes32 groupHash = Hashing.hashingAddressUint256(_address, _groupId);
        uint256 participationCount = countOfParticipation[groupHash];
        countOfParticipation[groupHash] = participationCount + 1;

        string memory metaDataURL = eventNftAttributes[
            Hashing.hashingDoubleUint256(_eventId, 0)
        ];
        string memory specialMetaDataURL = eventNftAttributes[
            Hashing.hashingDoubleUint256(_eventId, participationCount)
        ];
        if (
            keccak256(abi.encodePacked(specialMetaDataURL)) !=
            keccak256(abi.encodePacked(""))
        ) {
            metaDataURL = specialMetaDataURL;
        }

        uint256 tokenId = _tokenIds.current();

        nftMetaDataURL[tokenId] = metaDataURL;
        tokenIdsByEvent[_eventId].push(tokenId);
        eventIdOfTokenId[tokenId] = _eventId;

        _tokenIds.increment();
        _safeMint(_address, tokenId);

        emit MintedNFTAttributeURL(_address, metaDataURL);
    }

    function canMint(
        uint256 _eventId,
        uint256[24] memory _proof
    ) public view returns (bool) {
        require(verifySecretPhrase(_proof, _eventId), "invalid secret phrase");
        require(
            remainingEventNftCount[_eventId] != 0,
            "remaining count is zero"
        );

        require(
            !isHoldingEventNFTByAddress(_msgSender(), _eventId),
            "already minted"
        );

        require(!isMintLocked[_eventId], "mint is locked");

        return true;
    }

    function changeMintLocked(
        uint256 _eventId,
        bool _locked
    ) external onlyCollaboratorAccess(_eventId) whenNotPaused {
        isMintLocked[_eventId] = _locked;
        emit MintLocked(_eventId, _locked);
    }

    function changeNonTransferable(
        uint256 _eventId,
        bool _isNonTransferable
    ) external whenNotPaused {
        IEventManager eventManager = IEventManager(eventManagerAddr);

        require(
            _msgSender() == eventManagerAddr ||
                eventManager.hasAdminAccessByEventId(_msgSender(), _eventId),
            "you have no permission"
        );
        isNonTransferable[_eventId] = _isNonTransferable;

        emit NonTransferable(_eventId, _isNonTransferable);
    }

    function resetSecretPhrase(
        uint256 _eventId,
        bytes32 _secretPhrase
    ) external onlyCollaboratorAccess(_eventId) whenNotPaused {
        eventSecretPhrases[_eventId] = _secretPhrase;
        emit ResetSecretPhrase(_msgSender(), _eventId);
    }

    function getIsMintLocked(uint256 _eventId) external view returns (bool) {
        return isMintLocked[_eventId];
    }

    function getIsNonTransferable(
        uint256 _eventId
    ) external view returns (bool) {
        return isNonTransferable[_eventId];
    }

    function isHoldingEventNFTByAddress(
        address _addr,
        uint256 _eventId
    ) public view returns (bool) {
        return
            isHoldingEventNFT[Hashing.hashingAddressUint256(_addr, _eventId)];
    }

    function getCountOfParticipation(
        uint256 _groupId,
        address _address
    ) public view returns (uint256) {
        bytes32 groupHash = Hashing.hashingAddressUint256(_address, _groupId);
        return countOfParticipation[groupHash];
    }

    function setEventInfo(
        uint256 _eventId,
        uint256 _mintLimit,
        bytes32 _secretPhrase,
        NFTAttribute[] memory attributes
    ) external whenNotPaused {
        require(_msgSender() == eventManagerAddr, "unauthorized");
        remainingEventNftCount[_eventId] = _mintLimit;
        eventSecretPhrases[_eventId] = _secretPhrase;
        for (uint256 index = 0; index < attributes.length; index++) {
            eventNftAttributes[
                Hashing.hashingDoubleUint256(
                    _eventId,
                    attributes[index].requiredParticipateCount
                )
            ] = attributes[index].metaDataURL;
        }
    }

    function getRemainingNFTCount(
        uint256 _eventId
    ) external view returns (uint256) {
        return remainingEventNftCount[_eventId];
    }

    function getNFTAttributeRecordsByEventId(
        uint256 _eventId,
        uint256 _limit,
        uint256 _offset
    ) external view returns (NFTAttribute[] memory) {
        if (_limit == 0) {
            _limit = 100; // default limit
        }
        require(_limit <= 100, "limit is too large");
        // create array of nft attributes
        NFTAttribute[] memory _nftAttributeRecordsList = new NFTAttribute[](
            _limit
        );

        require(
            _offset <= type(uint256).max - _limit,
            "limit + offset must be <= 2^256 - 1"
        );

        uint256 limitWithOffset = _limit + _offset;
        uint256 count;

        for (uint256 i = _offset; i < limitWithOffset; i++) {
            string memory ipfsUrl = eventNftAttributes[
                Hashing.hashingDoubleUint256(_eventId, i)
            ];
            if (
                keccak256(abi.encodePacked(ipfsUrl)) !=
                keccak256(abi.encodePacked(""))
            ) {
                _nftAttributeRecordsList[count] = NFTAttribute(ipfsUrl, i);
                count++;
            }
        }

        NFTAttribute[] memory _nftAttributeRecords = new NFTAttribute[](count);
        for (uint256 j = 0; j < count; j++) {
            _nftAttributeRecords[j] = _nftAttributeRecordsList[j];
        }
        return _nftAttributeRecords;
    }

    function burn(uint256 tokenId) public onlyOwner {
        _burn(tokenId);
    }

    function tokenURI(
        uint256 _tokenId
    ) public view override returns (string memory) {
        string memory metaDataURL = nftMetaDataURL[_tokenId];
        return metaDataURL;
    }

    function verifySecretPhrase(
        uint256[24] memory _proof,
        uint256 _eventId
    ) internal view returns (bool) {
        ISecretPhraseVerifier secretPhraseVerifier = ISecretPhraseVerifier(
            secretPhraseVerifierAddr
        );
        uint256[1] memory publicInput = [uint256(eventSecretPhrases[_eventId])];
        bool result = secretPhraseVerifier.verifyProof(
            _proof,
            publicInput,
            _eventId
        );
        return result;
    }

    // Function to return a list of owners from an array of token IDs
    function ownerOfTokens(
        uint256[] memory _tokenIdArray
    ) public view returns (NFTHolder[] memory) {
        NFTHolder[] memory holders = new NFTHolder[](_tokenIdArray.length);
        for (uint256 index = 0; index < _tokenIdArray.length; index++) {
            holders[index] = NFTHolder(
                ownerOf(_tokenIdArray[index]),
                _tokenIdArray[index]
            );
        }
        return holders;
    }

    // Function to return a list of NFT holders for a specific event ID
    function getNFTHoldersByEvent(
        uint256 _eventId
    ) public view returns (NFTHolder[] memory) {
        return ownerOfTokens(tokenIdsByEvent[_eventId]);
    }

    // Function to return a list of NFT holders for a specific event group ID
    function getNFTHoldersByEventGroup(
        uint256 _groupId
    ) public view returns (NFTHolderWithEventId[] memory) {
        IEventManager eventManager = IEventManager(eventManagerAddr);
        EventRecord[] memory eventIds = eventManager.getEventRecordsByGroupId(
            _groupId
        );
        NFTHolder[][] memory tempHolders = new NFTHolder[][](eventIds.length);
        uint256 tokenidsLength = 0;
        for (uint256 index = 0; index < eventIds.length; index++) {
            tempHolders[index] = getNFTHoldersByEvent(
                eventIds[index].eventRecordId
            );
            tokenidsLength = tokenidsLength + tempHolders[index].length;
        }
        NFTHolderWithEventId[] memory holders = new NFTHolderWithEventId[](
            tokenidsLength
        );
        uint256 counter = 0;
        while (counter < tokenidsLength) {
            for (uint256 index = 0; index < eventIds.length; index++) {
                for (
                    uint256 index2 = 0;
                    index2 < tempHolders[index].length;
                    index2++
                ) {
                    holders[counter] = NFTHolderWithEventId(
                        tempHolders[index][index2].holderAddress,
                        eventIds[index].eventRecordId,
                        tempHolders[index][index2].tokenId
                    );
                    counter++;
                }
            }
        }
        return holders;
    }

    function getTokenIdsByEvent(
        uint256 eventId
    ) external view returns (uint256[] memory) {
        return tokenIdsByEvent[eventId];
    }

    function getEventIdOfTokenId(
        uint256 _tokenId
    ) public view returns (uint256) {
        return eventIdOfTokenId[_tokenId];
    }

    function getGroupIdByEvent(uint256 _eventId) public view returns (uint256) {
        IEventManager eventManager = IEventManager(eventManagerAddr);
        EventRecord memory _event = eventManager.getEventById(_eventId);
        return _event.groupId;
    }

    function getTokensOfOwner(
        address _address
    ) public view returns (TokenUriWithIds[] memory) {
        uint256 balance = balanceOf(_address);
        TokenUriWithIds[] memory tokenUrisWithIds = new TokenUriWithIds[](
            balance
        );
        for (uint256 index = 0; index < balance; index++) {
            uint256 tokenId = tokenOfOwnerByIndex(_address, index);
            uint256 eventId = eventIdOfTokenId[tokenId];

            tokenUrisWithIds[index] = TokenUriWithIds(
                eventId,
                tokenId,
                tokenURI(tokenId)
            );
        }
        return tokenUrisWithIds;
    }

    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        require(
            !isNonTransferable[eventIdOfTokenId[tokenId]],
            "transfer is locked"
        );
        super._transfer(from, to, tokenId);
    }
}