Token

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721BurnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol";

import "../interfaces/internal/INFTDropCollectionInitializer.sol";

import "../mixins/collections/CollectionRoyalties.sol";
import "../mixins/collections/ERC4906.sol";
import "../mixins/collections/LazyMintedCollection.sol";
import "../mixins/collections/NFTCollectionType.sol";
import "../mixins/collections/SequentialMintCollection.sol";
import "../mixins/collections/SharedPaymentCollection.sol";
import "../mixins/collections/TokenLimitedCollection.sol";
import "../mixins/roles/AdminRole.sol";
import "../mixins/roles/MinterRole.sol";
import "../mixins/shared/ContractFactory.sol";

error NFTDropCollection_Already_Revealed();
error NFTDropCollection_Base_URI_Must_Be_Set();
error NFTDropCollection_Exceeds_Max_Token_Id(uint256 maxTokenId);

/**
 * @title A contract to batch mint a collection of 1:1 NFTs.
 * @notice A 10% royalty to the creator is included which may be split with collaborators.
 * @author batu-inal & HardlyDifficult
 */
contract NFTDropCollection is
  INFTDropCollectionInitializer,
  ContractFactory,
  Initializable,
  ContextUpgradeable,
  ERC165Upgradeable,
  ERC4906,
  AccessControlUpgradeable,
  AdminRole,
  MinterRole,
  ERC721Upgradeable,
  ERC721BurnableUpgradeable,
  NFTCollectionType,
  SequentialMintCollection,
  TokenLimitedCollection,
  CollectionRoyalties,
  LazyMintedCollection,
  SharedPaymentCollection
{
  using Strings for uint256;

  /**
   * @notice Whether the collection is revealed or not.
   */
  bool public isRevealed;

  /**
   * @notice The base URI used for all NFTs in this collection.
   * @dev The `<tokenId>.json` is appended to this to obtain an NFT's `tokenURI`.
   *      e.g. The URI for `tokenId`: "1" with `baseURI`: "ipfs://foo/" is "ipfs://foo/1.json".
   * @return The base URI used by this collection.
   */
  string public baseURI;

  /**
   * @notice Emitted when the collection is revealed.
   * @param baseURI The base URI for the collection.
   * @param isRevealed Whether the collection is revealed.
   */
  event URIUpdated(string baseURI, bool isRevealed);

  modifier validBaseURI(string calldata baseURI_) {
    if (bytes(baseURI_).length == 0) {
      revert NFTDropCollection_Base_URI_Must_Be_Set();
    }
    _;
  }

  modifier onlyWhileUnrevealed() {
    if (isRevealed) {
      revert NFTDropCollection_Already_Revealed();
    }
    _;
  }

  /**
   * @notice Initialize the template's immutable variables.
   * @param _contractFactory The factory which will be used to create collection contracts.
   */
  constructor(address _contractFactory) ContractFactory(_contractFactory) NFTCollectionType(NFT_DROP_COLLECTION_TYPE) {
    // The template will be initialized by the factory when it's registered for use.
  }

  /**
   * @notice Called by the contract factory on creation.
   * @param _creator The creator of this collection.
   * This account is the default admin for this collection.
   * @param _name The collection's `name`.
   * @param _symbol The collection's `symbol`.
   * @param baseURI_ The base URI for the collection.
   * @param _isRevealed Whether the collection is revealed or not.
   * @param _maxTokenId The max token id for this collection.
   * @param _approvedMinter An optional address to grant the MINTER_ROLE.
   * Set to address(0) if only admins should be granted permission to mint.
   * @param _paymentAddress The address that will receive royalties and mint payments.
   */
  function initialize(
    address payable _creator,
    string calldata _name,
    string calldata _symbol,
    string calldata baseURI_,
    bool _isRevealed,
    uint32 _maxTokenId,
    address _approvedMinter,
    address payable _paymentAddress
  ) external initializer onlyContractFactory validBaseURI(baseURI_) {
    // Initialize the mixins
    __ERC721_init(_name, _symbol);
    _initializeSequentialMintCollection(_creator);
    _initializeTokenLimitedCollection(_maxTokenId);
    _initializeLazyMintedCollection(_creator, _approvedMinter);
    _initializeSharedPaymentCollection(_paymentAddress);

    // Initialize URI
    baseURI = baseURI_;
    isRevealed = _isRevealed;
  }

  /**
   * @inheritdoc LazyMintedCollection
   */
  function mintCountTo(uint16 count, address to) public override returns (uint256 firstTokenId) {
    // If the mint will exceed uint32, the addition here will overflow. But it's not realistic to mint that many tokens.
    if (latestTokenId + count > maxTokenId) {
      revert NFTDropCollection_Exceeds_Max_Token_Id(maxTokenId);
    }
    firstTokenId = super.mintCountTo(count, to);
  }

  /**
   * @notice Allows a collection admin to reveal the collection's final content.
   * @dev Once revealed, the collection's content is immutable.
   * Use `updatePreRevealContent` to update content while unrevealed.
   * @param baseURI_ The base URI of the final content for this collection.
   */
  function reveal(string calldata baseURI_) external onlyAdmin validBaseURI(baseURI_) onlyWhileUnrevealed {
    isRevealed = true;

    // Set the new base URI.
    baseURI = baseURI_;
    emit URIUpdated(baseURI_, true);

    // All tokens in this collection have been updated.
    emit BatchMetadataUpdate(0, type(uint256).max);
  }

  /**
   * @notice Allows the owner to set a max tokenID.
   * This provides a guarantee to collectors about the limit of this collection contract.
   * @dev Once this value has been set, it may be decreased but can never be increased.
   * This max may be more than the final `totalSupply` if 1 or more tokens were burned.
   * @param _maxTokenId The max tokenId to set, all NFTs must have a tokenId less than or equal to this value.
   */
  function updateMaxTokenId(uint32 _maxTokenId) external onlyAdmin {
    _updateMaxTokenId(_maxTokenId);
  }

  /**
   * @notice Allows a collection admin to update the pre-reveal content.
   * @dev Use `reveal` to reveal the final content for this collection.
   * @param baseURI_ The base URI of the pre-reveal content.
   */
  function updatePreRevealContent(
    string calldata baseURI_
  ) external validBaseURI(baseURI_) onlyWhileUnrevealed onlyAdmin {
    baseURI = baseURI_;
    emit URIUpdated(baseURI_, false);

    // All tokens in this collection have been updated.
    emit BatchMetadataUpdate(0, type(uint256).max);
  }

  /**
   * @inheritdoc ERC721Upgradeable
   * @dev The function here asserts `onlyAdmin` while the super confirms ownership.
   */
  function _burn(uint256 tokenId) internal override(ERC721Upgradeable, SequentialMintCollection) onlyAdmin {
    super._burn(tokenId);
  }

  /**
   * @notice Get the number of tokens which can still be minted.
   * @return count The max number of additional NFTs that can be minted by this collection.
   */
  function numberOfTokensAvailableToMint() external view returns (uint256 count) {
    // Mint ensures that latestTokenId is always <= maxTokenId
    unchecked {
      count = maxTokenId - latestTokenId;
    }
  }

  /**
   * @inheritdoc IERC165Upgradeable
   */
  function supportsInterface(
    bytes4 interfaceId
  )
    public
    view
    override(
      ERC165Upgradeable,
      ERC4906,
      ERC721Upgradeable,
      AccessControlUpgradeable,
      NFTCollectionType,
      LazyMintedCollection,
      CollectionRoyalties,
      SharedPaymentCollection
    )
    returns (bool isSupported)
  {
    isSupported = super.supportsInterface(interfaceId);
  }

  /**
   * @inheritdoc IERC721MetadataUpgradeable
   */
  function tokenURI(uint256 tokenId) public view override returns (string memory uri) {
    _requireMinted(tokenId);

    uri = string.concat(baseURI, tokenId.toString(), ".json");
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControlUpgradeable.sol";
import "../utils/ContextUpgradeable.sol";
import "../utils/StringsUpgradeable.sol";
import "../utils/introspection/ERC165Upgradeable.sol";
import "../proxy/utils/Initializable.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 AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    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(IAccessControlUpgradeable).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 ",
                        StringsUpgradeable.toHexString(account),
                        " is missing role ",
                        StringsUpgradeable.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());
        }
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
    /**
     * @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;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

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

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

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

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
    using AddressUpgradeable for address;
    using StringsUpgradeable for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    function __ERC721_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC721_init_unchained(name_, symbol_);
    }

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

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

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: 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 = _ownerOf(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 = ERC721Upgradeable.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or 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 or 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 or 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 the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @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 _ownerOf(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 = ERC721Upgradeable.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, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

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

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721Upgradeable.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721Upgradeable.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

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

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

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

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits 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 IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @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. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256, /* firstTokenId */
        uint256 batchSize
    ) internal virtual {
        if (batchSize > 1) {
            if (from != address(0)) {
                _balances[from] -= batchSize;
            }
            if (to != address(0)) {
                _balances[to] += batchSize;
            }
        }
    }

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC721Upgradeable.sol";
import "../../../utils/ContextUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";

/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be burned (destroyed).
 */
abstract contract ERC721BurnableUpgradeable is Initializable, ContextUpgradeable, ERC721Upgradeable {
    function __ERC721Burnable_init() internal onlyInitializing {
    }

    function __ERC721Burnable_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _burn(tokenId);
    }

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

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

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (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 IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * 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 v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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 v4.4.1 (utils/Context.sol)

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library MathUpgradeable {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

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

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

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

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

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/MathUpgradeable.sol";

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _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) {
        unchecked {
            uint256 length = MathUpgradeable.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, MathUpgradeable.log256(value) + 1);
        }
    }

    /**
     * @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] = _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
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

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

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

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

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

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _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) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @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] = _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 OR Apache-2.0

pragma solidity ^0.8.12;

/**
 * @title Declares the type of the collection contract.
 * @dev This interface is declared as an ERC-165 interface.
 * @author reggieag
 */
interface INFTCollectionType {
  function getNFTCollectionType() external view returns (string memory collectionType);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

/**
 * @title Declares the interface for initializing an NFTDropCollection contract.
 * @author batu-inal & HardlyDifficult
 */
interface INFTDropCollectionInitializer {
  function initialize(
    address payable _creator,
    string calldata _name,
    string calldata _symbol,
    string calldata _baseURI,
    bool isRevealed,
    uint32 _maxTokenId,
    address _approvedMinter,
    address payable _paymentAddress
  ) external;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

/**
 * @title The required interface for collections to support minting from the NFTDropMarket.
 * @dev This interface must be registered as a ERC165 supported interface.
 * @author batu-inal & HardlyDifficult
 */
interface INFTLazyMintedCollectionMintCountTo {
  function mintCountTo(uint16 count, address to) external returns (uint256 firstTokenId);

  /**
   * @notice Get the number of tokens which can still be minted.
   * @return count The max number of additional NFTs that can be minted by this collection.
   */
  function numberOfTokensAvailableToMint() external view returns (uint256 count);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

/**
 * @notice An interface for communicating fees to 3rd party marketplaces.
 * @dev Originally implemented in mainnet contract 0x44d6e8933f8271abcf253c72f9ed7e0e4c0323b3
 */
interface IGetFees {
  /**
   * @notice Get the recipient addresses to which creator royalties should be sent.
   * @dev The expected royalty amounts are communicated with `getFeeBps`.
   * @param tokenId The ID of the NFT to get royalties for.
   * @return recipients An array of addresses to which royalties should be sent.
   */
  function getFeeRecipients(uint256 tokenId) external view returns (address payable[] memory recipients);

  /**
   * @notice Get the creator royalty amounts to be sent to each recipient, in basis points.
   * @dev The expected recipients are communicated with `getFeeRecipients`.
   * @param tokenId The ID of the NFT to get royalties for.
   * @return royaltiesInBasisPoints The array of fees to be sent to each recipient, in basis points.
   */
  function getFeeBps(uint256 tokenId) external view returns (uint256[] memory royaltiesInBasisPoints);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

interface IGetRoyalties {
  /**
   * @notice Get the creator royalties to be sent.
   * @dev The data is the same as when calling `getFeeRecipients` and `getFeeBps` separately.
   * @param tokenId The ID of the NFT to get royalties for.
   * @return recipients An array of addresses to which royalties should be sent.
   * @return royaltiesInBasisPoints The array of fees to be sent to each recipient, in basis points.
   */
  function getRoyalties(
    uint256 tokenId
  ) external view returns (address payable[] memory recipients, uint256[] memory royaltiesInBasisPoints);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

/**
 * @notice Interface for EIP-2981: NFT Royalty Standard.
 * For more see: https://eips.ethereum.org/EIPS/eip-2981.
 */
interface IRoyaltyInfo {
  /**
   * @notice Get the creator royalties to be sent.
   * @param tokenId The ID of the NFT to get royalties for.
   * @param salePrice The total price of the sale.
   * @return receiver The address to which royalties should be sent.
   * @return royaltyAmount The total amount that should be sent to the `receiver`.
   */
  function royaltyInfo(
    uint256 tokenId,
    uint256 salePrice
  ) external view returns (address receiver, uint256 royaltyAmount);
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

interface ITokenCreator {
  /**
   * @notice Returns the creator of this NFT collection.
   * @param tokenId The ID of the NFT to get the creator payment address for.
   * @return creator The creator of this collection.
   */
  function tokenCreator(uint256 tokenId) external view returns (address payable creator);
}

// SPDX-License-Identifier: MIT
// Source: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/260e082/contracts/utils/ShortStrings.sol
// TODO: Swap out for the OZ library version once this has been published.

pragma solidity ^0.8.12;

type ShortString is bytes32;

/**
 * @dev This library provides functions to convert short memory strings
 * into a `ShortString` type that can be used as an immutable variable.
 * Strings of arbitrary length can be optimized if they are short enough by
 * the addition of a storage variable used as fallback.
 *
 * Usage example:
 *
 * ```solidity
 * contract Named {
 *     using ShortStrings for *;
 *
 *     ShortString private immutable _name;
 *     string private _nameFallback;
 *
 *     constructor(string memory contractName) {
 *         _name = contractName.toShortStringWithFallback(_nameFallback);
 *     }
 *
 *     function name() external view returns (string memory) {
 *         return _name.toStringWithFallback(_nameFallback);
 *     }
 * }
 * ```
 */
library ShortStrings {
  error StringTooLong(string str);

  /**
   * @dev Encode a string of at most 31 chars into a `ShortString`.
   *
   * This will trigger a `StringTooLong` error is the input string is too long.
   */
  function toShortString(string memory str) internal pure returns (ShortString) {
    bytes memory bstr = bytes(str);
    if (bstr.length > 31) {
      revert StringTooLong(str);
    }
    return ShortString.wrap(bytes32(uint256(bytes32(bstr)) | bstr.length));
  }

  /**
   * @dev Decode a `ShortString` back to a "normal" string.
   */
  function toString(ShortString sstr) internal pure returns (string memory) {
    uint256 len = length(sstr);
    // using `new string(len)` would work locally but is not memory safe.
    string memory str = new string(32);
    /// @solidity memory-safe-assembly
    assembly {
      mstore(str, len)
      mstore(add(str, 0x20), sstr)
    }
    return str;
  }

  /**
   * @dev Return the length of a `ShortString`.
   */
  function length(ShortString sstr) internal pure returns (uint256) {
    return uint256(ShortString.unwrap(sstr)) & 0xFF;
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol";

import "../../interfaces/standards/royalties/IGetFees.sol";
import "../../interfaces/standards/royalties/IGetRoyalties.sol";
import "../../interfaces/standards/royalties/IRoyaltyInfo.sol";
import "../../interfaces/standards/royalties/ITokenCreator.sol";

import "../shared/Constants.sol";

/**
 * @title Defines various royalty APIs for broad marketplace support.
 * @author batu-inal & HardlyDifficult
 */
abstract contract CollectionRoyalties is IGetRoyalties, IGetFees, IRoyaltyInfo, ITokenCreator, ERC165Upgradeable {
  /**
   * @inheritdoc IGetFees
   */
  function getFeeRecipients(uint256 tokenId) external view returns (address payable[] memory recipients) {
    recipients = new address payable[](1);
    recipients[0] = getTokenCreatorPaymentAddress(tokenId);
  }

  /**
   * @inheritdoc IGetFees
   * @dev The tokenId param is ignored since all NFTs return the same value.
   */
  function getFeeBps(uint256 /* tokenId */) external pure returns (uint256[] memory royaltiesInBasisPoints) {
    royaltiesInBasisPoints = new uint256[](1);
    royaltiesInBasisPoints[0] = ROYALTY_IN_BASIS_POINTS;
  }

  /**
   * @inheritdoc IGetRoyalties
   */
  function getRoyalties(
    uint256 tokenId
  ) external view returns (address payable[] memory recipients, uint256[] memory royaltiesInBasisPoints) {
    recipients = new address payable[](1);
    recipients[0] = getTokenCreatorPaymentAddress(tokenId);
    royaltiesInBasisPoints = new uint256[](1);
    royaltiesInBasisPoints[0] = ROYALTY_IN_BASIS_POINTS;
  }

  /**
   * @notice The address to pay the creator proceeds/royalties for the collection.
   * @param tokenId The ID of the NFT to get the creator payment address for.
   * @return creatorPaymentAddress The address to which royalties should be paid.
   */
  function getTokenCreatorPaymentAddress(
    uint256 tokenId
  ) public view virtual returns (address payable creatorPaymentAddress);

  /**
   * @inheritdoc IRoyaltyInfo
   */
  function royaltyInfo(
    uint256 tokenId,
    uint256 salePrice
  ) external view returns (address receiver, uint256 royaltyAmount) {
    receiver = getTokenCreatorPaymentAddress(tokenId);
    unchecked {
      royaltyAmount = salePrice / ROYALTY_RATIO;
    }
  }

  /**
   * @inheritdoc IERC165Upgradeable
   * @dev Checks the supported royalty interfaces.
   */
  function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool interfaceSupported) {
    interfaceSupported = (interfaceId == type(IRoyaltyInfo).interfaceId ||
      interfaceId == type(ITokenCreator).interfaceId ||
      interfaceId == type(IGetRoyalties).interfaceId ||
      interfaceId == type(IGetFees).interfaceId ||
      super.supportsInterface(interfaceId));
  }
}

// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol";

/**
 * @title ERC-4906: Metadata Update Event
 * @dev See https://eips.ethereum.org/EIPS/eip-4906
 */
contract ERC4906 is ERC165Upgradeable {
  /**
   * @notice This event emits when the metadata of a token is changed.
   * So that the third-party platforms such as NFT market could
   * timely update the images and related attributes of the NFT.
   * @param tokenId The ID of the NFT whose metadata is changed.
   */
  event MetadataUpdate(uint256 tokenId);

  /**
   * @notice This event emits when the metadata of a range of tokens is changed.
   * So that the third-party platforms such as NFT market could
   * timely update the images and related attributes of the NFTs.
   * @param fromTokenId The ID of the first NFT whose metadata is changed.
   * @param toTokenId The ID of the last NFT whose metadata is changed.
   */
  event BatchMetadataUpdate(uint256 fromTokenId, uint256 toTokenId);

  function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool isSupported) {
    // 0x49064906 is a magic number based on the EIP number.
    isSupported = interfaceId == bytes4(0x49064906) || super.supportsInterface(interfaceId);
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "../../interfaces/internal/INFTLazyMintedCollectionMintCountTo.sol";

import "../roles/MinterRole.sol";
import "./SequentialMintCollection.sol";

error DropCollection_Count_Must_Be_Greater_Than_Zero();

/**
 * @title Common functions for collections in which all tokens are defined at the time of collection creation.
 * @dev This implements the INFTLazyMintedCollectionMintCountTo ERC-165 interface.
 * @author HardlyDifficult
 */
abstract contract LazyMintedCollection is INFTLazyMintedCollectionMintCountTo, MinterRole, SequentialMintCollection {
  function _initializeLazyMintedCollection(address payable _creator, address _approvedMinter) internal {
    // Initialize access control
    AdminRole._initializeAdminRole(_creator);
    if (_approvedMinter != address(0)) {
      MinterRole._initializeMinterRole(_approvedMinter);
    }
  }

  /**
   * @notice Mint `count` number of NFTs for the `to` address.
   * @dev This is only callable by an address with either the MINTER_ROLE or the DEFAULT_ADMIN_ROLE.
   * @param count The number of NFTs to mint.
   * @param to The address to mint the NFTs for.
   * @return firstTokenId The tokenId for the first NFT minted.
   * The other minted tokens are assigned sequentially, so `firstTokenId` - `firstTokenId + count - 1` were minted.
   */
  function mintCountTo(uint16 count, address to) public virtual onlyMinterOrAdmin returns (uint256 firstTokenId) {
    if (count == 0) {
      revert DropCollection_Count_Must_Be_Greater_Than_Zero();
    }

    unchecked {
      // If +1 overflows then +count would also overflow, since count > 0.
      firstTokenId = latestTokenId + 1;
    }
    // If the mint will exceed uint32, the addition here will overflow. But it's not realistic to mint that many tokens.
    latestTokenId = latestTokenId + count;
    uint256 lastTokenId = latestTokenId;

    for (uint256 i = firstTokenId; i <= lastTokenId; ) {
      _safeMint(to, i);
      unchecked {
        ++i;
      }
    }
  }

  /**
   * @notice Allows a collection admin to destroy this contract only if
   * no NFTs have been minted yet or the minted NFTs have been burned.
   * @dev Once destructed, a new collection could be deployed to this address (although that's discouraged).
   */
  function selfDestruct() external onlyAdmin {
    _selfDestruct();
  }

  /**
   * @inheritdoc IERC165Upgradeable
   */
  function supportsInterface(
    bytes4 interfaceId
  ) public view virtual override(AccessControlUpgradeable, ERC721Upgradeable) returns (bool isSupported) {
    isSupported =
      interfaceId == type(INFTLazyMintedCollectionMintCountTo).interfaceId ||
      super.supportsInterface(interfaceId);
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol";
import "../../libraries/ShortStrings.sol";

import "../../interfaces/internal/INFTCollectionType.sol";

/**
 * @title A mixin to add the NFTCollectionType interface to a contract.
 * @author HardlyDifficult & reggieag
 */
abstract contract NFTCollectionType is INFTCollectionType, ERC165Upgradeable {
  using ShortStrings for string;
  using ShortStrings for ShortString;

  ShortString private immutable _collectionTypeName;

  constructor(string memory collectionTypeName) {
    _collectionTypeName = collectionTypeName.toShortString();
  }

  /**
   * @notice Returns a name of the type of collection this contract represents.
   * @return collectionType The collection type.
   */
  function getNFTCollectionType() external view returns (string memory collectionType) {
    collectionType = _collectionTypeName.toString();
  }

  /**
   * @inheritdoc IERC165Upgradeable
   */
  function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool interfaceSupported) {
    interfaceSupported = interfaceId == type(INFTCollectionType).interfaceId || super.supportsInterface(interfaceId);
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721BurnableUpgradeable.sol";

import "../../interfaces/standards/royalties/ITokenCreator.sol";

error SequentialMintCollection_Caller_Is_Not_Owner(address owner);
error SequentialMintCollection_Minted_NFTs_Must_Be_Burned_First(uint256 totalSupply);

/**
 * @title Extends the OZ ERC721 implementation for collections which mint sequential token IDs.
 * @author batu-inal & HardlyDifficult
 */
abstract contract SequentialMintCollection is ITokenCreator, ERC721BurnableUpgradeable {
  /****** Slot 0 (after inheritance) ******/
  /**
   * @notice The creator/owner of this NFT collection.
   * @dev This is the default royalty recipient if a different `paymentAddress` was not provided.
   * @return The collection's creator/owner address.
   */
  address payable public owner;

  /**
   * @notice The tokenId of the most recently created NFT.
   * @dev Minting starts at tokenId 1. Each mint will use this value + 1.
   * @return The most recently minted tokenId, or 0 if no NFTs have been minted yet.
   */
  uint32 public latestTokenId;

  /**
   * @notice Tracks how many tokens have been burned.
   * @dev This number is used to calculate the total supply efficiently.
   */
  uint32 private burnCounter;

  // 32-bits free space

  /****** End of storage ******/

  /**
   * @notice Emitted when this collection is self destructed by the creator/owner/admin.
   * @param admin The account which requested this contract be self destructed.
   */
  event SelfDestruct(address indexed admin);

  modifier onlyOwner() {
    if (msg.sender != owner) {
      revert SequentialMintCollection_Caller_Is_Not_Owner(owner);
    }
    _;
  }

  function _initializeSequentialMintCollection(address payable _creator) internal {
    owner = _creator;
  }

  /**
   * @notice Allows the collection owner to destroy this contract only if
   * no NFTs have been minted yet or the minted NFTs have been burned.
   */
  function _selfDestruct() internal {
    if (totalSupply() != 0) {
      revert SequentialMintCollection_Minted_NFTs_Must_Be_Burned_First(totalSupply());
    }

    emit SelfDestruct(msg.sender);
    selfdestruct(payable(msg.sender));
  }

  function _burn(uint256 tokenId) internal virtual override {
    unchecked {
      // Number of burned tokens cannot exceed latestTokenId which is the same size.
      ++burnCounter;
    }
    super._burn(tokenId);
  }

  /**
   * @inheritdoc ITokenCreator
   * @dev The tokenId param is ignored since all NFTs return the same value.
   */
  function tokenCreator(uint256 /* tokenId */) external view returns (address payable creator) {
    creator = owner;
  }

  /**
   * @notice Returns the total amount of tokens stored by the contract.
   * @dev From the ERC-721 enumerable standard.
   * @return supply The total number of NFTs tracked by this contract.
   */
  function totalSupply() public view returns (uint256 supply) {
    unchecked {
      // Number of tokens minted is always >= burned tokens.
      supply = latestTokenId - burnCounter;
    }
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "./CollectionRoyalties.sol";
import "./SequentialMintCollection.sol";

/**
 * @title Offers single payment address definition for all items in a given collection.
 * @author HardlyDifficult
 */
abstract contract SharedPaymentCollection is SequentialMintCollection, CollectionRoyalties {
  /**
   * @notice The address to pay the proceeds/royalties for the collection.
   * @dev If this is set to address(0) then the proceeds go to the creator.
   */
  address payable private paymentAddress;

  function _initializeSharedPaymentCollection(address payable _paymentAddress) internal {
    // Initialize royalties
    if (_paymentAddress != address(0)) {
      // If no payment address was defined, `.owner` will be returned in getTokenCreatorPaymentAddress() below.
      paymentAddress = _paymentAddress;
    }
  }

  /**
   * @inheritdoc CollectionRoyalties
   */
  function getTokenCreatorPaymentAddress(
    uint256 /* tokenId */
  ) public view override returns (address payable creatorPaymentAddress) {
    creatorPaymentAddress = paymentAddress;
    if (creatorPaymentAddress == address(0)) {
      creatorPaymentAddress = owner;
    }
  }

  /**
   * @inheritdoc IERC165Upgradeable
   */
  function supportsInterface(
    bytes4 interfaceId
  ) public view virtual override(ERC721Upgradeable, CollectionRoyalties) returns (bool isSupported) {
    isSupported = super.supportsInterface(interfaceId);
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "./SequentialMintCollection.sol";

error TokenLimitedCollection_Max_Token_Id_May_Not_Be_Cleared(uint256 currentMaxTokenId);
error TokenLimitedCollection_Max_Token_Id_May_Not_Increase(uint256 currentMaxTokenId);
error TokenLimitedCollection_Max_Token_Id_Must_Be_Greater_Than_Current_Minted_Count(uint256 currentMintedCount);
error TokenLimitedCollection_Max_Token_Id_Must_Not_Be_Zero();

/**
 * @title Defines an upper limit on the number of tokens which may be minted by this collection.
 * @author HardlyDifficult
 */
abstract contract TokenLimitedCollection is SequentialMintCollection {
  /**
   * @notice The max tokenId which can be minted.
   * @dev This max may be less than the final `totalSupply` if 1 or more tokens were burned.
   * @return The max tokenId which can be minted.
   */
  uint32 public maxTokenId;

  /**
   * @notice Emitted when the max tokenId supported by this collection is updated.
   * @param maxTokenId The new max tokenId. All NFTs in this collection will have a tokenId less than
   * or equal to this value.
   */
  event MaxTokenIdUpdated(uint256 indexed maxTokenId);

  function _initializeTokenLimitedCollection(uint32 _maxTokenId) internal {
    if (_maxTokenId == 0) {
      // When 0 is desired, the collection may choose to simply not call this initializer.
      revert TokenLimitedCollection_Max_Token_Id_Must_Not_Be_Zero();
    }

    maxTokenId = _maxTokenId;
  }

  /**
   * @notice Allows the owner to set a max tokenID.
   * This provides a guarantee to collectors about the limit of this collection contract, if applicable.
   * @dev Once this value has been set, it may be decreased but can never be increased.
   * @param _maxTokenId The max tokenId to set, all NFTs must have a tokenId less than or equal to this value.
   */
  function _updateMaxTokenId(uint32 _maxTokenId) internal {
    if (_maxTokenId == 0) {
      revert TokenLimitedCollection_Max_Token_Id_May_Not_Be_Cleared(maxTokenId);
    }
    if (maxTokenId != 0 && _maxTokenId >= maxTokenId) {
      revert TokenLimitedCollection_Max_Token_Id_May_Not_Increase(maxTokenId);
    }
    if (latestTokenId > _maxTokenId) {
      revert TokenLimitedCollection_Max_Token_Id_Must_Be_Greater_Than_Current_Minted_Count(latestTokenId);
    }

    maxTokenId = _maxTokenId;
    emit MaxTokenIdUpdated(_maxTokenId);
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";

error AdminRole_Caller_Does_Not_Have_Admin_Role();

/**
 * @title Defines a role for admin accounts.
 * @dev Wraps the default admin role from OpenZeppelin's AccessControl for easy integration.
 * @author batu-inal & HardlyDifficult
 */
abstract contract AdminRole is AccessControlUpgradeable {
  modifier onlyAdmin() {
    if (!hasRole(DEFAULT_ADMIN_ROLE, msg.sender)) {
      revert AdminRole_Caller_Does_Not_Have_Admin_Role();
    }
    _;
  }

  function _initializeAdminRole(address admin) internal {
    // Grant the role to a specified account
    _grantRole(DEFAULT_ADMIN_ROLE, admin);
  }

  /**
   * @notice Adds an account as an approved admin.
   * @dev Only callable by existing admins, as enforced by `grantRole`.
   * @param account The address to be approved.
   */
  function grantAdmin(address account) external {
    grantRole(DEFAULT_ADMIN_ROLE, account);
  }

  /**
   * @notice Removes an account from the set of approved admins.
   * @dev Only callable by existing admins, as enforced by `revokeRole`.
   * @param account The address to be removed.
   */
  function revokeAdmin(address account) external {
    revokeRole(DEFAULT_ADMIN_ROLE, account);
  }

  /**
   * @notice Checks if the account provided is an admin.
   * @param account The address to check.
   * @return approved True if the account is an admin.
   * @dev This call is used by the royalty registry contract.
   */
  function isAdmin(address account) public view returns (bool approved) {
    approved = hasRole(DEFAULT_ADMIN_ROLE, account);
  }

  /**
   * @notice This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[1_000] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";

import "./AdminRole.sol";

error MinterRole_Caller_Does_Not_Have_Minter_Or_Admin_Role();

/**
 * @title Defines a role for minter accounts.
 * @dev Wraps a role from OpenZeppelin's AccessControl for easy integration.
 * @author batu-inal & HardlyDifficult
 */
abstract contract MinterRole is AccessControlUpgradeable, AdminRole {
  /**
   * @notice The `role` type used for approve minters.
   * @return `keccak256("MINTER_ROLE")`
   */
  bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

  modifier onlyMinterOrAdmin() {
    if (!isMinter(msg.sender) && !isAdmin(msg.sender)) {
      revert MinterRole_Caller_Does_Not_Have_Minter_Or_Admin_Role();
    }
    _;
  }

  function _initializeMinterRole(address minter) internal {
    // Grant the role to a specified account
    _grantRole(MINTER_ROLE, minter);
  }

  /**
   * @notice Adds an account as an approved minter.
   * @dev Only callable by admins, as enforced by `grantRole`.
   * @param account The address to be approved.
   */
  function grantMinter(address account) external {
    grantRole(MINTER_ROLE, account);
  }

  /**
   * @notice Removes an account from the set of approved minters.
   * @dev Only callable by admins, as enforced by `revokeRole`.
   * @param account The address to be removed.
   */
  function revokeMinter(address account) external {
    revokeRole(MINTER_ROLE, account);
  }

  /**
   * @notice Checks if the account provided is an minter.
   * @param account The address to check.
   * @return approved True if the account is an minter.
   */
  function isMinter(address account) public view returns (bool approved) {
    approved = hasRole(MINTER_ROLE, account);
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

/// Constant values shared across mixins.

/**
 * @dev 100% in basis points.
 */
uint256 constant BASIS_POINTS = 10_000;

/**
 * @dev The default admin role defined by OZ ACL modules.
 */
bytes32 constant DEFAULT_ADMIN_ROLE = 0x00;

////////////////////////////////////////////////////////////////
// Royalties & Take Rates
////////////////////////////////////////////////////////////////

/**
 * @dev The max take rate an exhibition can have.
 */
uint256 constant MAX_EXHIBITION_TAKE_RATE = 5_000;

/**
 * @dev Cap the number of royalty recipients.
 * A cap is required to ensure gas costs are not too high when a sale is settled.
 */
uint256 constant MAX_ROYALTY_RECIPIENTS = 5;

/**
 * @dev Default royalty cut paid out on secondary sales.
 * Set to 10% of the secondary sale.
 */
uint96 constant ROYALTY_IN_BASIS_POINTS = 1_000;

/**
 * @dev 10%, expressed as a denominator for more efficient calculations.
 */
uint256 constant ROYALTY_RATIO = BASIS_POINTS / ROYALTY_IN_BASIS_POINTS;

////////////////////////////////////////////////////////////////
// Gas Limits
////////////////////////////////////////////////////////////////

/**
 * @dev The gas limit used when making external read-only calls.
 * This helps to ensure that external calls does not prevent the market from executing.
 */
uint256 constant READ_ONLY_GAS_LIMIT = 40_000;

/**
 * @dev The gas limit to send ETH to multiple recipients, enough for a 5-way split.
 */
uint256 constant SEND_VALUE_GAS_LIMIT_MULTIPLE_RECIPIENTS = 210_000;

/**
 * @dev The gas limit to send ETH to a single recipient, enough for a contract with a simple receiver.
 */
uint256 constant SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT = 20_000;

////////////////////////////////////////////////////////////////
// Collection Type Names
////////////////////////////////////////////////////////////////

/**
 * @dev The NFT collection type.
 */
string constant NFT_COLLECTION_TYPE = "NFT Collection";

/**
 * @dev The NFT drop collection type.
 */
string constant NFT_DROP_COLLECTION_TYPE = "NFT Drop Collection";

/**
 * @dev The NFT edition collection type.
 */
string constant NFT_TIMED_EDITION_COLLECTION_TYPE = "NFT Timed Edition Collection";

////////////////////////////////////////////////////////////////
// Business Logic
////////////////////////////////////////////////////////////////

/**
 * @dev Limits scheduled start/end times to be less than 2 years in the future.
 */
uint256 constant MAX_SCHEDULED_TIME_IN_THE_FUTURE = 365 days * 2;

/**
 * @dev The minimum increase of 10% required when making an offer or placing a bid.
 */
uint256 constant MIN_PERCENT_INCREMENT_DENOMINATOR = BASIS_POINTS / 1_000;

// SPDX-License-Identifier: MIT OR Apache-2.0

pragma solidity ^0.8.12;

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

error ContractFactory_Only_Callable_By_Factory_Contract(address contractFactory);
error ContractFactory_Factory_Is_Not_A_Contract();

/**
 * @title Stores a reference to the factory which is used to create contract proxies.
 * @author batu-inal & HardlyDifficult
 */
abstract contract ContractFactory {
  using AddressUpgradeable for address;

  /**
   * @notice The address of the factory which was used to create this contract.
   * @return The factory contract address.
   */
  address public immutable contractFactory;

  modifier onlyContractFactory() {
    if (msg.sender != contractFactory) {
      revert ContractFactory_Only_Callable_By_Factory_Contract(contractFactory);
    }
    _;
  }

  /**
   * @notice Initialize the template's immutable variables.
   * @param _contractFactory The factory which will be used to create these contracts.
   */
  constructor(address _contractFactory) {
    if (!_contractFactory.isContract()) {
      revert ContractFactory_Factory_Is_Not_A_Contract();
    }
    contractFactory = _contractFactory;
  }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1337000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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