// File: contracts/SellableAllowlistSpot.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.6;

import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IERC721Receiver} from "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {Pausable} from "@openzeppelin/contracts/security/Pausable.sol";
import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import {Settings} from "./Settings.sol";

contract SellableAllowlistSpot is
    IERC721Receiver,
    ReentrancyGuard,
    Pausable,
    Initializable
    {
    /// ==================================
    /// ==== VAULT INFORMATION ======
    /// ==================================

    /// @notice protocol-wide settings
    address public immutable settings;

    /// @notice the creator & admin of the vault, entitled to fees
    address public vaultOwner;

    /// @notice fee charged per transaction (not per NFT)
    uint256 public fee;

    /// @notice if there are 0 reservedBuyers, anyone can mint
    /// otherwise only addresses in `isReserved` can mint
    mapping (address => bool) public isReserved;
    uint256 public reservedBuyerCount;

    /// @notice NFTs owed to buyers
    /// @dev claiming NFTs happens in a second tx
    ///      token ->            borrower -> number of NFTs
    mapping (address => mapping (address => uint256)) public claimable;
    
    /// @notice overall NFTs owed to buyers by the vault
    /// required so that vault owner can claim eg airdrops
    /// without stealing them from buyers.
    mapping (address => uint256) public totalClaimable;

    /// ==================================
    /// ==== EVENTS ======
    /// ==================================
    
    /// @notice Emitted when `minter` pays `fee` to mint `tokenIDs` from `nft`
    event FlashmintedSafe(address indexed minter, address indexed nft, uint256[] tokenIDs, uint256 fee);

    /// @notice Emitted when `minter` mints `amount` of NFTs (minted)
    event Flashminted(address indexed minter, address indexed minted, uint256 amount, uint256 fee);

    /// @notice Emitted when `minter` claims NFTs they minted
    event ClaimedMint(address indexed claimant, address indexed minted, uint256[] tokenIds);

    /// @notice emitted when cost-per-tx is updated
    event FeeUpdated(uint256 fee);

    /// @notice emitted when user claims their balance
    event Cash(address depositor, uint256 depositorAmt, uint256 protocolAmt);

    /// @notice emitted when the vault is reserved for a buyer, 0x0 means anyone can use the vault
    event Reserved(address indexed buyer, bool indexed isReserved, uint256 reservedCount);

    /// @notice emitted to be able track what mint it's for
    event ForMint(string projectName);

    /// ==================================
    /// ==== MODIFIERS  ======
    /// ==================================
    modifier onlyVaultOwner {
        require(msg.sender == vaultOwner, "not owner");
        _;
    }

    modifier noMeanCalldata(bytes calldata _mintData) {
        bytes4 APPROVE = bytes4(0x095ea7b3);
        bytes4 APPROVE_FOR_ALL = bytes4(0xa22cb465);
        bytes4 sig = bytes4(_mintData[:4]);
        require(
            sig != APPROVE && sig != APPROVE_FOR_ALL,
            "no mean sigs"
        );
        _;
    }

    /// ---------------------------
    /// === LIFECYCLE/ADMIN FUNCTIONS ===
    /// ---------------------------
    constructor(address _settings) {
        settings = _settings;
    } 

    function initializeVault(address _owner, uint256 _fee) external initializer {
        vaultOwner = _owner;
        fee = _fee;
    }

    /// @notice vault owner can stop usage at any time
    function pause(bool _shouldPause) external onlyVaultOwner {
        if (_shouldPause) {
            _pause();
        } else {
            _unpause();
        }
    }

    /// @notice update fee charged to use vault
    function updateFee(uint256 _fee) external onlyVaultOwner {
        fee = _fee;
        emit FeeUpdated(fee);
    }

    /// @notice update the reserved buyer
    function updateReservedBuyer(address _buyer, bool _isReserved) external onlyVaultOwner {
        require(isReserved[_buyer] != _isReserved, "already set");

        if (_isReserved) {
            ++reservedBuyerCount;
        } else {
            --reservedBuyerCount;
        }

        isReserved[_buyer] = _isReserved;
        emit Reserved(_buyer, _isReserved, reservedBuyerCount);
    }

    /// @notice register a project this is WL'd for
    function registerAddressForMint(string calldata _projectName) external onlyVaultOwner {
        emit ForMint(_projectName);
    }

    /// ---------------------------
    /// === EXTERNAL FUNCTIONS ===
    /// ---------------------------

    /// @notice allows anyone to forward fees out to vault owner
    function withdrawFees() external nonReentrant {
        uint256 amount = address(this).balance;
        uint256 protocolFee = amount * Settings(settings).protocolFeeBips() / 10000;
        address protocol = Settings(settings).protocolFeeReceiver();

        bool sent;
        // if there is a protocol fee, pay it
        if (protocolFee > 0 && protocol != address(0)) {
            (sent, ) = payable(protocol).call{value: protocolFee}("");
            require(sent, "protocol fee fail");
        }
        // pay the owner
        (sent, ) = payable(vaultOwner).call{value: amount - protocolFee}("");
        require(sent, "owner pay fail");

        emit Cash(vaultOwner, amount - protocolFee, protocolFee);
    }

    /// MINT METHOD 1 of 2: If the NFT mints with `mint` instead 
    /// of `safeMint`, two transactions are required
    /// One to mint, and another to claim once the tokenID is known (from logs)
    /// Without safeMint, you don't know which tokenID you got

    /// @notice mint an NFT that doesn't use `safeMint()`
    /// without knowing the tokenId, a further call is required to claim
    /// @notice this function is unsafe for buyers if _nft is sketchy
    function mint(
        address _nft,
        bytes calldata _mintData
    ) external payable 
        noMeanCalldata(_mintData)
        whenNotPaused
        nonReentrant
    {
        require(_nft != vaultOwner, "cant call owner");
        require(_nft != address(this), "cant call self");
        require(reservedBuyerCount == 0 || isReserved[msg.sender], "reserved");
        // check our balance at start so we know if we got anything
        uint256 balanceBefore = IERC721(_nft).balanceOf(address(this));

        // mint the NFTs
        (bool success, ) = _nft.call{value: msg.value - fee}(_mintData);
        require(success, "failed to mint");

        // ensure we got something
        uint256 gained = IERC721(_nft).balanceOf(address(this)) - balanceBefore;
        require(gained > 0, "didnt mint");

        // set aside the right number of NFTs for the buyer
        claimable[_nft][msg.sender] += gained;
        totalClaimable[_nft] += gained;

        emit Flashminted(msg.sender, _nft, gained, fee);
    }

    /// @notice claim an NFT minted with `mint()`
    /// @notice this function works even if vault is paused
    function claimMintedNFT(address _nft, uint256[] calldata _newTokenIds) external nonReentrant {
        require(_nft != vaultOwner, "cant call owner");

        uint256 len = _newTokenIds.length;
        
        // throws if msg.sender doesnt have enough
        claimable[_nft][msg.sender] -= len;
        totalClaimable[_nft] -= len;

        for (uint256 i = 0; i < len; ++i) {
            // throws if we don't own `_newTokenIds[i]`
            IERC721(_nft).safeTransferFrom(
                address(this),
                msg.sender,
                _newTokenIds[i]
            );
        }
        emit ClaimedMint(msg.sender, _nft, _newTokenIds);
    }

    /// MINT METHOD 2 of 2: With `safeMint()`
    /// If the NFT uses `safeMint()`, then we get a callback
    /// that includes the tokenID so we transfer it
    /// right away.


    /// private variables to manage state between
    /// the safeMint fn call & the 721Received callback

    // list of all received tokenIDs...
    uint256[] private _safeMintReceivedNFTs;
    
    // ...from the address we're trying to mint from
    address private _nftToMint;

    function safeMint(
        address _nft,
        bytes calldata _mintData
    ) external payable
        nonReentrant
        noMeanCalldata(_mintData)
        whenNotPaused
    {
        require(_nft != vaultOwner, "cant call owner");
        require(_nft != address(this), "cant call self");
        require(reservedBuyerCount == 0 || isReserved[msg.sender], "reserved");

        // clear private variables
        _safeMintReceivedNFTs = new uint256[](0);
        _nftToMint = _nft;

        // mint the NFTs, which will call `onERC721Received`
        (bool success, ) = _nft.call{value: msg.value - fee}(_mintData);
        require(success, "failed to mint");

        uint256 gained = _safeMintReceivedNFTs.length;
        require(gained > 0, "didnt mint");

        for (uint256 i; i < gained; ++i) {
            // throws if we don't own `_newTokenIds[i]`
            IERC721(_nft).safeTransferFrom(
                address(this),
                msg.sender,
                _safeMintReceivedNFTs[i]
            );
        }

        emit FlashmintedSafe(msg.sender, _nft, _safeMintReceivedNFTs, fee);

        // delete private vars
        delete _safeMintReceivedNFTs;
        delete _nftToMint;
    }
    
    function onERC721Received(
        address,
        address,
        uint256 tokenId,
        bytes calldata
    ) external override returns (bytes4) {
        if (msg.sender == _nftToMint){
            _safeMintReceivedNFTs.push(tokenId);
        }
        return this.onERC721Received.selector;
    }


    /// ---------------------------
    /// === RESCUE AIRDROPS IF ANY  ===
    /// ---------------------------

    function rescueCoin(address _coin) external 
        onlyVaultOwner
    {
        uint256 balance = IERC20(_coin).balanceOf(address(this));
        IERC20(_coin).transfer(msg.sender, balance);
    }

    function rescueNFT(address _token, uint256 _tokenId) external
        onlyVaultOwner
    {
        require(
            // totalClaimable[_token] must be reserved
            // for buyers to claim
            IERC721(_token).balanceOf(address(this)) >
            totalClaimable[_token],
            "reserved"
        );

        IERC721(_token).safeTransferFrom(
            address(this),
            msg.sender,
            _tokenId
        );
    }

    receive() external payable{}
}
// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



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

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

// File: @openzeppelin/contracts/security/Pausable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: @openzeppelin/contracts/proxy/utils/Initializable.sol



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

pragma solidity ^0.8.0;

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

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

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

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

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

// File: contracts/Settings.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

contract Settings is Ownable {
    event RoyaltyInfoUpdated(address indexed receiver, uint256 royaltyPercentBips);
    event ProtocolFeeUpdated(address indexed receiver, uint256 protocolFeeBips);
    event MarketplaceAdminUpdated(address indexed marketplaceAdmin);

    // royalties on LP tokens
    uint256 public royaltyPercentBips; // ie 250 = 2.5%
    address public royaltyReceiver; 

    // protocol fee on flashmints
    uint256 public protocolFeeBips; 
    address public protocolFeeReceiver;

    // some NFT marketplaces want NFTs to have an `owner()` function
    address public marketplaceAdmin;

    string public baseURI;

    // royalties, protocol fee are 0 unless turned on
    constructor() {
        baseURI = "http://flashmint.ooo/api/tokenURI/";
    }

    function setRoyaltyPercentBips(uint256 _royaltyPercentBips) external onlyOwner {
        require(_royaltyPercentBips < 1000, "royalties: cmon"); // force prevent high royalties
        royaltyPercentBips = _royaltyPercentBips;
        
        emit RoyaltyInfoUpdated(royaltyReceiver, _royaltyPercentBips);
    }

    function setRoyaltyReceiver(address _royaltyReceiver) external onlyOwner {
        royaltyReceiver = _royaltyReceiver;
        emit RoyaltyInfoUpdated(_royaltyReceiver, royaltyPercentBips);
    }

    function setProtocolFee(uint256 _protocolFeeBips) external onlyOwner {
        require(_protocolFeeBips < 5000, "fee: cmon");
        protocolFeeBips = _protocolFeeBips;
        emit ProtocolFeeUpdated(protocolFeeReceiver, _protocolFeeBips);
    }

    function setProtocolFeeReceiver(address _protocolFeeReceiver) external onlyOwner {
        protocolFeeReceiver = _protocolFeeReceiver;
        emit ProtocolFeeUpdated(_protocolFeeReceiver, protocolFeeBips);
    }

    function setMarketplaceAdmin(address _marketplaceAdmin) external onlyOwner {
        marketplaceAdmin = _marketplaceAdmin;
        emit MarketplaceAdminUpdated(_marketplaceAdmin);
    }

    function setBaseURI(string calldata _baseURI) external onlyOwner {
        baseURI = _baseURI;
    }
}
// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



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

pragma solidity ^0.8.0;

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

// File: @openzeppelin/contracts/utils/Context.sol



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

pragma solidity ^0.8.0;

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

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

// File: @openzeppelin/contracts/utils/Address.sol



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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/access/Ownable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

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

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