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//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

import "./Round.sol";
import "./Oracle.sol";
import "./interfaces/IMaster.sol";
import "./interfaces/IMetaDataOracle.sol";

/// @title Main master contract
contract MasterContract is AccessControl, IMaster, ERC721 {
  using Address for address payable;
  using Strings for uint256;

  uint[] private _mintedIds;
  bool public migrated;
  bool public showMetadata = true;

  address public CROSSMINT_ADDRESS = 0xdAb1a1854214684acE522439684a145E62505233;
  address public constant WITHDRAW_ADDRESS = 0x0867436a889bf9C1abCAf3c505046FC4F7880b50;
  address public constant OWNER_ADDRESS = 0xf867C48da1Aa3268FEBCff36a6879066dd8EB304;

  bytes32 public constant ORACLE_ROLE = keccak256("ORACLE_ROLE");
  bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

  string private baseUri;
  string private notRevealUri;
  uint16 private _totalSupply;
  uint16 private _maxSupply;

  mapping(bytes32 => RoleData) private _roles;
  mapping(bytes32 => address[]) public roleOwners;

  IMetaDataOracle private metaDataOracle;

  mapping(Round => RoundContract) public RoundContracts;
  mapping(Round => uint256) private _roundPrice;
  mapping(uint => string) private _tokenAttributesJSON;
  mapping(uint => bool) private _requests;
  mapping(uint => string) _tokenRound;

  /// @notice Is the token occupied
  /// @dev tokenId => true or false
  mapping(uint => bool) public occupiedIdxs;

  uint256 public revealDate;

  // EVENTS
  event MintRand(address indexed owner, uint indexed id);
  event ChangeReveal(uint _newDate);
  event ChangeMaxSupply(uint16 newMaxSupply);

  event Migrate(address reciever, uint id);
  event Withdrawn(address reciever);

  /// @notice event for check if oracle contract was changed
  event OracleAddressChanged(address oracle);

  /// @notice event emit when resived successful
  event MetaDataReceived(string json, uint id, uint tokenId);

  /// @notice event emit when request data for token
  event MetaDataRequested(uint tokenId, uint id);

  /// @notice event emit when new token was minted
  event MintTokens(address owner, Round round, uint[] tokenIds);

  modifier onlyOracle() {
    require(msg.sender == address(metaDataOracle), "Unauthorized.");
    _;
  }

  constructor(
    string memory _name,
    string memory _symbol,
    string memory _notRevealUri,
    string memory _baseUri,
    uint16 maxSupply_,
    uint256 _revealDate
    ) ERC721(_name, _symbol) {
      notRevealUri = _notRevealUri;
      baseUri = _baseUri;
      _maxSupply = maxSupply_;
      revealDate = _revealDate;

      _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
      _grantRole(DEFAULT_ADMIN_ROLE, OWNER_ADDRESS);
      _grantRole(MINTER_ROLE, CROSSMINT_ADDRESS);

      roleOwners[DEFAULT_ADMIN_ROLE].push(msg.sender);
      roleOwners[DEFAULT_ADMIN_ROLE].push(OWNER_ADDRESS);
      roleOwners[MINTER_ROLE].push(CROSSMINT_ADDRESS);
  }

  function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
    roleOwners[role].push(account);
    _grantRole(role, account);
  }

  function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
    for (uint256 i = 0; i < roleOwners[role].length; i++) {
      if (roleOwners[role][i] == account) {
        delete roleOwners[role][i];
        break;
      }
    }
    _revokeRole(role, account);
  }

  function setCrossmintAddress(address _newAddress) external onlyRole(DEFAULT_ADMIN_ROLE) {
    CROSSMINT_ADDRESS = _newAddress;
  }

  function addMinter(Round _round, address _minter) external onlyRole(DEFAULT_ADMIN_ROLE) {
    _grantRole(MINTER_ROLE, _minter);
    roleOwners[MINTER_ROLE].push(_minter);
    _roundPrice[_round] = RoundContract(payable(_minter)).mintPrice();
    RoundContracts[_round] = RoundContract(payable(_minter));
  }

  function removeMinter(Round _round) external onlyRole(DEFAULT_ADMIN_ROLE) {
    _revokeRole(MINTER_ROLE, address(RoundContracts[_round]));
    RoundContracts[_round] = RoundContract(address(0));
  }

  function setMaxSupply(uint16 maxSupply_) external onlyRole(DEFAULT_ADMIN_ROLE) {
    _maxSupply = maxSupply_;
    emit ChangeMaxSupply(_maxSupply);
  }

  function totalSupply() external view override returns(uint) {
    return _totalSupply;
  }

  function maxSupply() external view override returns(uint) {
    return _maxSupply;
  }

  /// @notice Сhecks whether the collection is revealed 
  function isRevealed() public view returns(bool) {
    return block.timestamp >= revealDate;
  }

  function tokenRoundString(uint tokenId) public view returns(string memory) {
    return _tokenRound[tokenId];
  }

  /// @notice Get token URI
  /// @dev Checks if the collection is revealed and return <notRevealUri> or <currentBaseURI + token URI>
  /// @param tokenId Current token Id
  /// @return tokenURI Link to token metadata
  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)
    {
      require(
        _exists(tokenId),
        "ERC721Metadata: URI query for nonexistent token"
      );
      
      if(!isRevealed()) {
        return notRevealUri;
      }

      string memory currentBaseURI = baseUri;
      return bytes(currentBaseURI).length > 0
          ? string(abi.encodePacked(currentBaseURI, _tokenRound[tokenId], "/metadata/", Strings.toString(tokenId), ".json"))
          : "";
  }

  function setBaseUri(string calldata _baseUri) external onlyRole(DEFAULT_ADMIN_ROLE) {
    baseUri = _baseUri;
  }

  /// @notice Auxiliary function for marketplaces
  /// @param interfaceId Bytes like id of contract interfase
  /// @return boolean
  function supportsInterface(bytes4 interfaceId) public pure override(AccessControl, ERC721) returns (bool) {
    return interfaceId == type(IERC721).interfaceId;
  }

  /// @notice Service function for working with oracle
  /// @param json strigify json data
  /// @param id of request
  /// @param tokenId token id
  function fulfillMetaDataRequest(string memory json, uint id, uint tokenId) external override onlyRole(ORACLE_ROLE) {
    require(_requests[id], "Request is invalid or already fulfilled.");

    _tokenAttributesJSON[tokenId] = json;

    delete _requests[id];
    emit MetaDataReceived(json, id, tokenId);
  }

  function setMetaDataOracleAddress(address newAddress) external override onlyRole(DEFAULT_ADMIN_ROLE) {
    metaDataOracle = IMetaDataOracle(newAddress);
    _setupRole(ORACLE_ROLE, newAddress);
    emit OracleAddressChanged(newAddress);
  }

  function getRoundPrice(Round round) external view override returns(uint) {
    return _roundPrice[round];
  }

  function _getAttributes(uint tokenId) internal {

    require(metaDataOracle != IMetaDataOracle(address(0)), "Oracle not initialized.");
     
    uint256 id = metaDataOracle.requestMetaData(tokenId);
    _requests[id] = true;
    
    emit MetaDataRequested(tokenId, id);
  }
  
  function setShowMetadata(bool _show) external onlyRole(MINTER_ROLE) {
    showMetadata = _show;
  }

  function showMetaData(uint tokenId) external view override returns(string memory) {
    require(isRevealed(), "NFT: collections not revealed");
    require(showMetadata, "NFT: Can't show metedata now");
    return _tokenAttributesJSON[tokenId];
  }

  function roundAddress(Round round) external view returns(address) {
    return address(RoundContracts[round]);
  }

  function mintedIds() external view returns(uint[] memory) {
    return _mintedIds;
  }

  function getRoundTotalSupply(Round round) external view returns(uint) {
    return RoundContracts[round].roundTotalSupply();
  }

  /// @notice refers to the selected round and says whether the token is occupied or not
  /// @param tokenId target token id
  /// @return bool
  function idOccupied(uint tokenId) external view override returns(bool) {
    return occupiedIdxs[tokenId];
  }

  /// @notice main mint function, wich generate and mint batch of tokens
  /// @param tokenIdxs - number of tokens for mint
  /// @dev all the checks with the round are taken out here in order not to carry them out twice
  /// @dev if contract not found free token ids contract will send funds back
  function mint(uint[] memory tokenIdxs, address from, string memory name) override(IMaster) external onlyRole(MINTER_ROLE) {
    _totalSupply += uint16(tokenIdxs.length);

    for (uint256 i = 0; i < tokenIdxs.length; i++) {
      _tokenRound[tokenIdxs[i]] = name;
      _getAttributes(tokenIdxs[i]);
      occupiedIdxs[tokenIdxs[i]] = true;
      _mintedIds.push(tokenIdxs[i]);
      _safeMint(from, tokenIdxs[i]);
      emit MintRand(from, tokenIdxs[i]);
    }
  }

  /// @notice Use for check the content of the element in the array
  /// @dev using for generate array of random unique number
  /// @param array of uints
  /// @param value target value
  function _contain(uint[] memory array, uint value) pure private returns(bool) {
    bool contained = false;
    for (uint256 i = 0; i < array.length; i++) {
      if (array[i] == value) {
        contained = true;
        break;
      }
    }
    return contained;
  }

  
  function migrate(address reciever, uint id, string memory collectionName) external onlyRole(DEFAULT_ADMIN_ROLE) {
    require(!migrated, "Already done!");
    _tokenRound[id] = collectionName;
    occupiedIdxs[id] = true;
    _mintedIds.push(id);
    _safeMint(reciever, id);
    _getAttributes(id);

    emit Migrate(reciever, id);
  }

  function setMigrate(bool _state) external onlyRole(DEFAULT_ADMIN_ROLE){
    migrated = _state;
  }

  /// @notice                         Function for change reveal data
  /// @param                          _newDate target timestamp
  function                            setReveal(uint _newDate) external onlyRole(DEFAULT_ADMIN_ROLE) {
    revealDate = _newDate;
    emit ChangeReveal(_newDate);
  }

  /// @notice                            Mint function for pay from bank card
  /// @param                             _to address of tokens reciver
  /// @param                             _count number of tokens to mint
  /// @param                             _round enum value of round
  /// @param                             _name token's round name
  function                               crossmint(address _to, uint _count, Round _round, string memory _name) external payable onlyRole(MINTER_ROLE) {
    RoundContract round = RoundContracts[_round];
    uint[] memory tokenIdxs = round.generateUnique(_count, msg.sender);

    require(address(round.getMaster()) != address(0), "NFT: Master not init in round");
    require(msg.value == _roundPrice[_round] * _count, "NFT: Incorrect ETH value sent");

    if (_contain(tokenIdxs, 0)) {
      payable(msg.sender).sendValue(msg.value);
      revert("NFT: The required number of tokens was not found, try again");
    }

    for (uint256 i = 0; i < tokenIdxs.length; i++) {
      _tokenRound[tokenIdxs[i]] = _name;
      occupiedIdxs[tokenIdxs[i]] = true;

      _getAttributes(tokenIdxs[i]);
      _mintedIds.push(tokenIdxs[i]);
      _safeMint(_to, tokenIdxs[i]);

      emit MintRand(_to, tokenIdxs[i]);
    }
  }

  /// @notice                         Withdrawn funds to treasury
  function                            withdrawn() external onlyRole(DEFAULT_ADMIN_ROLE) {
    payable(WITHDRAW_ADDRESS).sendValue(address(this).balance);
    emit Withdrawn(WITHDRAW_ADDRESS);
  }
}

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

pragma solidity ^0.8.0;

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

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

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// 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
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "./interfaces/IMaster.sol";

/// @title Rare round minter contract
/// @notice The contract allows you to mint new NFT as well as change the parameters of the collection
contract                            RoundContract is AccessControl {
  using Address for address payable;

  address public constant              WITHDRAW_ADDRESS = 0xf867C48da1Aa3268FEBCff36a6879066dd8EB304;
  address public constant              OWNER_ADDRESS = 0x0867436a889bf9C1abCAf3c505046FC4F7880b50;
  address public constant              PROVIDER_WALLET_ADDRESS = 0x706EbB592Ea9D75E7981B7944aA1de28d30D6C14;

  uint256 private constant             ORACLE_FEE = 0.015 ether;

  mapping(bytes32 => address[]) public roleOwners;

  /// @notice main round information
  struct                             RoundInfo {
    uint256                          mintPrice;
    uint16                           collPadding;
    uint16                           maxSupply;
    uint16                           roundSupply;
    uint256                          startTimestamp;
    uint256                          endTimestamp;
    uint16                           maxPurchase;
    string                           roundName;
  }
  RoundInfo public                   info;

  IMaster masterContract;

  mapping(address => uint) public    userPurchasedNum;

  event                              Withdrawn(address recipient);

  modifier inRound() {
    require(block.timestamp >= info.startTimestamp, "Wait until round starts!");
    require(block.timestamp <= info.endTimestamp, "Round already finished!");
    _;
  }
  
  modifier mintPossible(uint nTokens) {
    require(nTokens <= info.maxPurchase, "Round: too many token to mint");
    require(userPurchasedNum[msg.sender] + nTokens <= info.maxPurchase, "Round: too many tokens to mint");
    require(address(PROVIDER_WALLET_ADDRESS).balance > ORACLE_FEE, "Round: Provider the wallet has insufficient funds");
    _;
  }

  constructor(
    uint256                          _mintPrice,
    uint16                           _reserved,
    uint16                           _collPadding,
    uint16                           _maxSupply,
    uint256                          _startTimestamp,
    uint256                          _endTimestamp,
    uint16                           _maxPurchase,
    string memory                    _roundName
    ) {
      info.mintPrice = _mintPrice;
      info.collPadding = _collPadding;
      info.maxSupply = _maxSupply;
      info.startTimestamp = _startTimestamp;
      info.endTimestamp = _endTimestamp;
      info.maxPurchase = _maxPurchase;
      info.roundName = _roundName;
      info.roundSupply = (info.maxSupply - info.collPadding) - _reserved;

      _grantRole(DEFAULT_ADMIN_ROLE, OWNER_ADDRESS);
      _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
      
      roleOwners[DEFAULT_ADMIN_ROLE].push(OWNER_ADDRESS);
      roleOwners[DEFAULT_ADMIN_ROLE].push(msg.sender);
  }

  function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
    roleOwners[role].push(account);
    _grantRole(role, account);
  }

  function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
    for (uint256 i = 0; i < roleOwners[role].length; i++) {
      if (roleOwners[role][i] == account) {
        delete roleOwners[role][i];
        break;
      }
    }
    _revokeRole(role, account);
  }

  /// @notice                         mint price of current round
  function                            mintPrice() external view returns(uint) {
    return info.mintPrice;
  }

  /// @notice                         get round total supply of not minted tokens
  function                            roundTotalSupply() external view returns(uint) {
    return info.roundSupply;
  }

  /// @notice                         set master contract for round
  function                            setMaster(address _master) external onlyRole(DEFAULT_ADMIN_ROLE) {
    masterContract = IMaster(_master);
  }

  function                            setStartDate(uint _start) external onlyRole(DEFAULT_ADMIN_ROLE) {
    info.startTimestamp = _start;
  }

  function                            setEndDate(uint _end) external onlyRole(DEFAULT_ADMIN_ROLE) {
    info.endTimestamp = _end;
  }

  /// @notice                         user can get master contract address
  /// @return                         address of master contract
  function                            getMaster() public view returns(address) {
    return address(masterContract);
  }

  /// @notice                         create psudo-random number to get index
  /// @param                          i - nonce
  /// @param                          from - salt
  /// @return                         uint - new psudo-random value
  function                            _random(uint i, address from) private view returns(uint) {
    uint randomnumber = uint(keccak256(abi.encodePacked(block.timestamp, from, i))) % (info.maxSupply - info.collPadding);
    randomnumber = randomnumber + info.collPadding;
    return randomnumber + 1;
  }

  /// @notice                         Use for check the content of the element in the array
  /// @dev                            using for generate array of random unique number
  /// @param                          array of uints
  /// @param                          value target value
  function                            _contain(uint[] memory array, uint value) pure private returns(bool) {
    bool contained = false;
    for (uint256 i = 0; i < array.length; i++) {
      if (array[i] == value) {
        contained = true;
        break;
      }
    }
    return contained;
  }

  /// @notice                         Withdrawn funds to treasury
  function                            withdrawn() external onlyRole(DEFAULT_ADMIN_ROLE) {
    payable(WITHDRAW_ADDRESS).sendValue(address(this).balance);
    emit Withdrawn(WITHDRAW_ADDRESS);
  }

  /// @notice                         function for call paid mind for users
  /// @dev                            check if user's sended funds enough for mint n times
  /// @param                          nTokens is number of tokens for mint
  function                            paidMint(uint nTokens) public payable mintPossible(nTokens) inRound {
    require(msg.value >= info.mintPrice * nTokens, "NFT round: Not enough funds");
    _mintTokens(nTokens);
  }

  function generateUnique(uint _nTokens, address _from) external view inRound mintPossible(_nTokens) returns(uint[] memory) {
    uint[]  memory idxs = new uint[](_nTokens);
    uint16  n = 0;
    uint    i = 0;

    while(_contain(idxs, 0)) {
      uint idx = _random(i, _from);
      if (!masterContract.idOccupied(idx) && !_contain(idxs, idx)) {
        idxs[i] = idx;
        i++;
      }
      else {
        n++;
      }
      if (n == 100) {
        break;
      }
    }

    return idxs;
  }

  /// @notice Create random number
  /// @dev the function accesses an external master contract and asks if the generated id is busy
  /// @dev max attemps - 250
  /// @param nTokens => attempt
  function _mintTokens(uint nTokens) private {
    uint[]  memory idxs = new uint[](nTokens);
    uint16  n = 0;
    uint    i = 0;

    while(_contain(idxs, 0)) {
      uint idx = _random(i, msg.sender);
      if (!masterContract.idOccupied(idx) && !_contain(idxs, idx)) {
        idxs[i] = idx;
        i++;
      }
      else {
        n++;
      }
      if (n == 250) {
        payable(msg.sender).sendValue(msg.value);
        revert("NFT: The required number of tokens was not found, try again");
      }
    }
    payable(PROVIDER_WALLET_ADDRESS).sendValue(ORACLE_FEE);
    userPurchasedNum[msg.sender] += nTokens;
    info.roundSupply -= uint16(nTokens);
    masterContract.mint(idxs, msg.sender, info.roundName);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "./interfaces/IMaster.sol";
import "./interfaces/IMetaDataOracle.sol";

contract MetaDataOracle is AccessControl, IMetaDataOracle {
  
  /// @notice struct for response
  struct Response {
    address providerAddress;
    address callerAddress;
    string json;
  }

  bytes32 public constant PROVIDER_ROLE = keccak256("PROVIDER_ROLE");

  event MetadataRequested(address sender, uint id, uint tokenId);
  event MetaDataReturned(string json, address caller, uint id);
  event ProviderAdded(address provider);
  event ProviderRemoved(address provider);
  event ProvidersThresholdChanged(uint n);

  /// @notice how many contracts may refer to it
  uint private numProviders = 0;
  uint private providersThreshold = 1;
  uint private randNonce = 0;

  mapping(uint256 => bool) private pendingRequests;
  mapping(uint256 => Response[]) private idToResponses;

  event Received(address, uint);

  constructor() {
    _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
  }

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

  function takeRole(address caller) external override onlyRole(DEFAULT_ADMIN_ROLE) {
    _setupRole(PROVIDER_ROLE, caller);
  }

  /// @notice Funcrtion that create request for metadata
  /// @param tokenId the token we are interested in
  /// @return id - ID of request
  function requestMetaData(uint tokenId) external override returns (uint256) {
    require(numProviders > 0, " No data providers not yet added.");
    randNonce++;
    
    uint id = uint(keccak256(abi.encodePacked(block.timestamp, msg.sender, randNonce))) % 1000;
    pendingRequests[id] = true;

    emit MetadataRequested(msg.sender, id, tokenId);
    return id;
  }

  function returnMetadata(string memory json, address callerAddress, uint256 id, uint tokenId) external override onlyRole(PROVIDER_ROLE) {
    require(pendingRequests[id], "Request not found.");
    Response memory res = Response(msg.sender, callerAddress, json);
    idToResponses[id].push(res);
    uint numResponses = idToResponses[id].length;

    if (numResponses == providersThreshold) {
      string memory resJSON = "";

      for (uint i=0; i < idToResponses[id].length; i++) {
        resJSON = idToResponses[id][i].json;
      }

      delete pendingRequests[id];
      delete idToResponses[id];

      IMaster(callerAddress).fulfillMetaDataRequest(resJSON, id, tokenId);
      emit MetaDataReturned(resJSON, callerAddress, id);
    }
  }

  function addProvider(address provider) external override onlyRole(DEFAULT_ADMIN_ROLE) {
    require(!hasRole(PROVIDER_ROLE, provider), "Provider already added.");

    _grantRole(PROVIDER_ROLE, provider);
    numProviders++;

    emit ProviderAdded(provider);
  }

  function removeProvider(address provider) external override onlyRole(DEFAULT_ADMIN_ROLE) {
    require(!hasRole(PROVIDER_ROLE, provider), "Address is not a recognized provider.");
    require (numProviders > 1, "Cannot remove the only provider.");
    _revokeRole(PROVIDER_ROLE, provider);
    numProviders--;
    
    emit ProviderRemoved(provider);
  }

  function setProvidersThreshold(uint threshold) external override onlyRole(DEFAULT_ADMIN_ROLE) {
    require(threshold > 0, "Threshold cannot be zero.");
    providersThreshold = threshold;
    
    emit ProvidersThresholdChanged(providersThreshold);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

interface IMaster {
  enum Round {
    Legendary,
    Epic,
    SuperRare,
    Rare,
    Public
  }

  function totalSupply() external view returns(uint);

  function maxSupply() external view returns(uint);

  function fulfillMetaDataRequest(string memory json, uint id, uint tokenId) external;

  function setMetaDataOracleAddress(address newAddress) external;

  function getRoundPrice(Round round) external view returns(uint);

  function showMetaData(uint tokenId) external view returns(string memory);

  function mint(uint[] memory tokenIdxs, address from, string memory name) external;

  function idOccupied(uint tokenId) external view returns(bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

interface IMetaDataOracle {
  function takeRole(address caller) external;

  function requestMetaData(uint tokenId) external returns(uint256);

  function returnMetadata(string memory json, address callerAddress, uint256 id, uint tokenId) external;

  function addProvider(address provider) external;

  function removeProvider(address provider) external;

  function setProvidersThreshold(uint threshold) external;
}

// 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 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

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

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

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

// 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;
    }
}

// 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
// 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 v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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-----Decoded View---------------
Arg [0] : _name (string): Lana Super Yacht
Arg [1] : _symbol (string): LSY
Arg [2] : _notRevealUri (string): https://ipfs.io/ipfs/QmfMLsbXqeRimXJz25P8giBCNPa1qucT71WQ8dNzREM6zX?filename=unrevealed.json
Arg [3] : _baseUri (string): https://ipfs.io/ipfs/QmWDxvSHthABi6qogGYNztmRPV6Ufoy1jJ4vVe4PdZ6LKJ/
Arg [4] : maxSupply_ (uint16): 7000
Arg [5] : _revealDate (uint256): 1663344000

-----Encoded View---------------
18 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [3] : 00000000000000000000000000000000000000000000000000000000000001c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000001b58
Arg [5] : 0000000000000000000000000000000000000000000000000000000063249d80
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000010
Arg [7] : 4c616e6120537570657220596163687400000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [9] : 4c53590000000000000000000000000000000000000000000000000000000000
Arg [10] : 000000000000000000000000000000000000000000000000000000000000005c
Arg [11] : 68747470733a2f2f697066732e696f2f697066732f516d664d4c736258716552
Arg [12] : 696d584a7a32355038676942434e506131717563543731575138644e7a52454d
Arg [13] : 367a583f66696c656e616d653d756e72657665616c65642e6a736f6e00000000
Arg [14] : 0000000000000000000000000000000000000000000000000000000000000044
Arg [15] : 68747470733a2f2f697066732e696f2f697066732f516d574478765348746841
Arg [16] : 426936716f6747594e7a746d5250563655666f79316a4a347656653450645a36
Arg [17] : 4c4b4a2f00000000000000000000000000000000000000000000000000000000