// File: contracts/Basket.sol



pragma solidity =0.8.7;

import { SafeERC20 } from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import { IERC20 } from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import { ERC20Upgradeable } from '@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol';
import { Ownable } from '@openzeppelin/contracts/access/Ownable.sol';
import { ReentrancyGuard } from '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import './interfaces/IAuction.sol';
import './interfaces/IBasket.sol';
import './interfaces/IFactory.sol';

contract Basket is IBasket, ERC20Upgradeable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    uint256 public constant TIMELOCK_DURATION = 1 days; // 1 day
    uint256 public constant ONE_YEAR = 365.25 days;
    uint256 private constant BASE = 1e18;
    uint256 public licenseFeeInc = 5e16; // 5%

    uint256 public maxSupply;

    address override public publisher;
    uint256 public licenseFee;

    IFactory public override factory;
    IAuction public override auction;

    uint256 public override ibRatio;

    PendingPublisher public pendingPublisher;
    PendingLicenseFee public pendingLicenseFee;
    PendingWeights public pendingWeights;
    PendingMaxSupply public pendingMaxSupply;

    address[] public tokens;
    uint256[] public weights;

    uint256 public override lastFee;

    bool public override initialized;

    function initialize(IFactory.Proposal memory proposal, IAuction auction_) external override {
        require(address(factory) == address(0));
        require(!initialized);
        initialized = true;

        publisher = proposal.proposer;
        licenseFee = proposal.licenseFee;
        factory = IFactory(msg.sender);
        auction = auction_;
        ibRatio = BASE;
        tokens = proposal.tokens;
        weights = proposal.weights;
        maxSupply = proposal.maxSupply;
        approveUnderlying(address(auction));

        __ERC20_init(proposal.tokenName, proposal.tokenSymbol);
    }

    function getPendingWeights() external override view returns (address[] memory, uint256[] memory, uint256) {
        return (pendingWeights.tokens, pendingWeights.weights, pendingWeights.minIbRatio);
    }

    function validateWeights(address[] memory _tokens, uint256[] memory _weights) public override pure {
        require(_tokens.length > 0);
        require(_tokens.length == _weights.length);
        uint256 length = _tokens.length;
        address[] memory tokenList = new address[](length);

        // check uniqueness of tokens and not token(0)

        for (uint i = 0; i < length; i++) {
            require(_tokens[i] != address(0));
            require(_weights[i] > 0);

            for (uint256 x = 0; x < tokenList.length; x++) {
                require(_tokens[i] != tokenList[x]);
            }

            tokenList[i] = _tokens[i];
        }
    }

    function mint(uint256 amount) public override {
        mintTo(amount, msg.sender);
    }

    function mintTo(uint256 amount, address to) public nonReentrant override {
        require(auction.auctionOngoing() == false);
        require(amount > 0);
        uint256 startSupply = totalSupply();
        require(startSupply + amount <= maxSupply);

        handleFees(startSupply);

        pullUnderlying(amount, msg.sender);

        _mint(to, amount);

        require(totalSupply() <= maxSupply);

        emit Minted(to, amount);
    }

    function burn(uint256 amount) public nonReentrant override {
        require(auction.auctionOngoing() == false);
        require(amount > 0);

        uint256 startSupply = totalSupply();
        handleFees(startSupply);

        _burn(msg.sender, amount);
        pushUnderlying(amount, msg.sender);
        
        emit Burned(msg.sender, amount);
    }

    function auctionBurn(uint256 amount) onlyAuction nonReentrant external override {
        uint256 startSupply = totalSupply();
        handleFees(startSupply);
        startSupply = totalSupply();
        _burn(msg.sender, amount);

        if (totalSupply() > 0) {
            uint256 newIbRatio = ibRatio * startSupply / totalSupply();
            ibRatio = newIbRatio;
        } else {
            ibRatio = BASE;
        }


        emit NewIBRatio(ibRatio);
        emit Burned(msg.sender, amount);
    }

    function handleFees(uint256 startSupply) private {
        if (lastFee == 0 || startSupply == 0) {
            lastFee = block.timestamp;
        } else {
            uint256 timeDiff = (block.timestamp - lastFee);
            uint256 fee = startSupply * licenseFee * timeDiff / ONE_YEAR / BASE;

            _mint(publisher, fee * (BASE - factory.ownerSplit()) / BASE);
            _mint(Ownable(address(factory)).owner(), fee * factory.ownerSplit() / BASE);
            lastFee = block.timestamp;

            uint256 newIbRatio = ibRatio * startSupply / totalSupply();
            ibRatio = newIbRatio;

            emit NewIBRatio(ibRatio);
        }
    }

    // changes publisher
    // timelocked
    function changePublisher(address newPublisher) onlyPublisher public override {
        require(newPublisher != address(0));

        if (pendingPublisher.publisher != address(0) && pendingPublisher.publisher == newPublisher) {
            require(block.timestamp >= pendingPublisher.timestamp + TIMELOCK_DURATION);
            publisher = newPublisher;

            pendingPublisher.publisher = address(0);

            emit ChangedPublisher(publisher);
        } else {
            pendingPublisher.publisher = newPublisher;
            pendingPublisher.timestamp = block.timestamp;

            emit NewPublisherSubmitted(newPublisher);
        }
    }

    //changes licenseFee
    // timelocked
    function changeLicenseFee(uint256 newLicenseFee) onlyPublisher public override {
        require(newLicenseFee >= factory.minLicenseFee() && newLicenseFee != licenseFee);
        if (pendingLicenseFee.licenseFee != 0 && pendingLicenseFee.licenseFee == newLicenseFee) {
            require(block.timestamp >= pendingLicenseFee.timestamp + TIMELOCK_DURATION);
            licenseFee = newLicenseFee;

            pendingLicenseFee.licenseFee = 0;

            emit ChangedLicenseFee(licenseFee);
        } else {
            if (newLicenseFee > licenseFee) {
                require(newLicenseFee - licenseFee <= licenseFeeInc);
            } else {
                require(licenseFee - newLicenseFee <= licenseFeeInc);
            }
            pendingLicenseFee.licenseFee = newLicenseFee;
            pendingLicenseFee.timestamp = block.timestamp;

            emit NewLicenseFeeSubmitted(newLicenseFee);
        }
    }

    //changes maxSupply
    // timelocked
    function setNewMaxSupply(uint256 newMaxSupply) onlyPublisher public override {
        require(newMaxSupply > totalSupply());

        if (pendingMaxSupply.maxSupply != 0 && pendingMaxSupply.maxSupply == newMaxSupply) {
            require(block.timestamp >= pendingMaxSupply.timestamp + TIMELOCK_DURATION);
            maxSupply = newMaxSupply;

            pendingMaxSupply.maxSupply = 0;

            emit ChangedMaxSupply(newMaxSupply);
        } else {
            pendingMaxSupply.maxSupply = newMaxSupply;
            pendingMaxSupply.timestamp = block.timestamp;

            emit NewMaxSupplySubmitted(newMaxSupply);
        }
    }

    // publish new index
    // timelocked
    function publishNewIndex(address[] memory _tokens, uint256[] memory _weights, uint256 _minIbRatio) onlyPublisher public override {
        if (pendingWeights.pending) {
            require(block.timestamp >= pendingWeights.timestamp + TIMELOCK_DURATION);
            if (auction.auctionOngoing() == false) {
                auction.startAuction();

                emit PublishedNewIndex(publisher);
            } else if (auction.hasBonded()) {

            } else {
                auction.killAuction();

                require(_minIbRatio > 0, 'minIbRatio must be > 0');
                validateWeights(_tokens, _weights);
                pendingWeights.tokens = _tokens;
                pendingWeights.weights = _weights;
                pendingWeights.timestamp = block.timestamp;
                pendingWeights.minIbRatio = _minIbRatio;

                emit NewIndexSubmitted();
            }
        } else {
            require(_minIbRatio > 0, 'minIbRatio must be > 0');
            validateWeights(_tokens, _weights);
            pendingWeights.pending = true;
            pendingWeights.tokens = _tokens;
            pendingWeights.weights = _weights;
            pendingWeights.timestamp = block.timestamp;
            pendingWeights.minIbRatio = _minIbRatio;

            emit NewIndexSubmitted();
        }
    }

    function setNewWeights() onlyAuction external override {
        tokens = pendingWeights.tokens;
        weights = pendingWeights.weights;
        pendingWeights.pending = false;

        approveUnderlying(address(auction));

        emit WeightsSet();
    }

    // delete pending index
    function deleteNewIndex() public override {
        require(msg.sender == publisher || msg.sender == address(auction));
        require(auction.auctionOngoing() == false);

        pendingWeights.pending = false;

        emit DeletedNewIndex(msg.sender);
    }

    function updateIBRatio(uint256 newRatio) onlyAuction external override returns (uint256) {
        ibRatio = newRatio;

        emit NewIBRatio(ibRatio);

        return ibRatio;
    }

    function approveUnderlying(address spender) private {
        for (uint256 i = 0; i < weights.length; i++) {
            IERC20(tokens[i]).safeApprove(spender, 0);
            IERC20(tokens[i]).safeApprove(spender, type(uint256).max);
        }
    }

    function pushUnderlying(uint256 amount, address to) private {
        for (uint256 i = 0; i < weights.length; i++) {
            uint256 tokenAmount = amount * weights[i] * ibRatio / BASE / BASE;
            IERC20(tokens[i]).safeTransfer(to, tokenAmount);
        }
    }

    function pullUnderlying(uint256 amount, address from) private {
        for (uint256 i = 0; i < weights.length; i++) {
            uint256 tokenAmount = amount * weights[i] * ibRatio / BASE / BASE;
            require(tokenAmount > 0);
            IERC20(tokens[i]).safeTransferFrom(from, address(this), tokenAmount);
        }
    }

    modifier onlyAuction() {
        require(msg.sender == address(auction));
        _;
    }

    modifier onlyPublisher() {
        require(msg.sender == address(publisher));
        _;
    }
}
// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

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



// SPDX-License-Identifier: MIT

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-upgradeable/token/ERC20/ERC20Upgradeable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

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

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
    uint256[45] private __gap;
}

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



// SPDX-License-Identifier: MIT

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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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



// SPDX-License-Identifier: MIT

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 make 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: contracts/interfaces/IAuction.sol



pragma solidity =0.8.7;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IBasket.sol";
import "./IFactory.sol";

interface IAuction {
    struct Bounty {
        address token;
        uint256 amount;
        bool active;
    }

    function startAuction() external;
    function bondForRebalance() external;
    function settleAuctionWithBond(
        uint256[] calldata,
        address[] calldata,
        uint256[] calldata,
        address[] calldata,
        uint256[] calldata
    ) external;
    function settleAuctionWithoutBond(
        uint256[] calldata,
        address[] calldata,
        uint256[] calldata,
        address[] calldata,
        uint256[] calldata
    ) external;
    function bondBurn() external;
    function killAuction() external;
    function endAuction() external;
    function addBounty(IERC20, uint256) external returns (uint256);
    function initialize(address, address) external;
    function initialized() external view returns (bool);
    function calcIbRatio(uint256 blockNum) external view returns (uint256);
    function getCurrentNewIbRatio() external view returns(uint256);

    function auctionOngoing() external view returns (bool);
    function auctionStart() external view returns (uint256);
    function hasBonded() external view returns (bool);
    function bondAmount() external view returns (uint256);
    function bondTimestamp() external view returns (uint256);
    function bondBlock() external view returns (uint256);

    function basket() external view returns (IBasket);
    function factory() external view returns (IFactory);
    function auctionBonder() external view returns (address);

    event AuctionStarted();
    event Bonded(address _bonder, uint256 _amount);
    event AuctionSettled(address _settler);
    event BondBurned(address _burned, address _burnee, uint256 _amount);
    event BountyAdded(IERC20 _token, uint256 _amount, uint256 _id);
    event BountyClaimed(address _claimer, address _token, uint256 _amount, uint256 _id);
}
// File: contracts/interfaces/IBasket.sol



pragma solidity =0.8.7;

import "./IAuction.sol";
import "./IFactory.sol";

interface IBasket {
    struct PendingPublisher {
        address publisher;
        uint256 timestamp;
    }

    struct PendingLicenseFee {
        uint256 licenseFee;
        uint256 timestamp;
    }

    struct PendingMaxSupply {
        uint256 maxSupply;
        uint256 timestamp;
    }

    struct PendingWeights {
        address[] tokens;
        uint256[] weights;
        uint256 timestamp;
        bool pending;
        uint256 minIbRatio;
    }

    function initialize(IFactory.Proposal memory, IAuction) external;
    function mint(uint256) external;
    function mintTo(uint256, address) external;
    function burn(uint256) external;
    function changePublisher(address) external;
    function changeLicenseFee(uint256) external;
    function setNewMaxSupply(uint256) external;
    function publishNewIndex(address[] calldata, uint256[] calldata, uint256) external;
    function deleteNewIndex() external;
    function auctionBurn(uint256) external;
    function updateIBRatio(uint256) external returns (uint256);
    function setNewWeights() external;
    function validateWeights(address[] memory, uint256[] memory) external pure;
    function initialized() external view returns (bool);

    function ibRatio() external view returns (uint256);
    function getPendingWeights() external view returns (address[] memory, uint256[] memory, uint256);
    function factory() external view returns (IFactory);
    function auction() external view returns (IAuction);
    function lastFee() external view returns (uint256);
    function publisher() external view returns (address);

    event Minted(address indexed _to, uint256 _amount);
    event Burned(address indexed _from, uint256 _amount);
    event ChangedPublisher(address indexed _newPublisher);
    event ChangedLicenseFee(uint256 _newLicenseFee);
    event NewPublisherSubmitted(address indexed _newPublisher);
    event NewLicenseFeeSubmitted(uint256 _newLicenseFee);
    event NewIndexSubmitted();
    event PublishedNewIndex(address _publisher);
    event DeletedNewIndex(address _sender);
    event WeightsSet();
    event NewIBRatio(uint256);
    event NewMaxSupplySubmitted(uint256 _newMaxSupply);
    event ChangedMaxSupply(uint256 _newMaxSupply);

}
// File: contracts/interfaces/IFactory.sol



pragma solidity =0.8.7;

import "./IBasket.sol";
import "./IAuction.sol";

interface IFactory {
    struct Proposal {
        uint256 licenseFee;
        string tokenName;
        string tokenSymbol;
        address proposer;
        address[] tokens;
        uint256[] weights;
        address basket;
        uint256 maxSupply;
    }

    struct PendingChange{
        uint256 change;
        uint256 timestamp;
    }


    function proposal(uint256) external view returns (Proposal memory);
    function proposals(uint256[] memory _ids) external view returns (Proposal[] memory); 
    function proposalsLength() external view returns (uint256);
    function minLicenseFee() external view returns (uint256);
    function auctionDecrement() external view returns (uint256);
    function auctionMultiplier() external view returns (uint256);
    function bondPercentDiv() external view returns (uint256);
    function ownerSplit() external view returns (uint256);
    function auctionImpl() external view returns (IAuction);
    function basketImpl() external view returns (IBasket);
    function getProposalWeights(uint256 id) external view returns (address[] memory, uint256[] memory);

    function createBasket(uint256) external returns (IBasket);
    function proposeBasketLicense(uint256, string calldata, string calldata, address[] memory tokens, uint256[] memory weights, uint256) external returns (uint256);
    function setMinLicenseFee(uint256) external;
    function setAuctionDecrement(uint256) external;
    function setAuctionMultiplier(uint256) external;
    function setBondPercentDiv(uint256) external;
    function setOwnerSplit(uint256) external;

    event BasketCreated(address indexed basket, uint256 id);
    event BasketLicenseProposed(address indexed proposer, string tokenName, uint256 indexed id);

    event NewMinLicenseFeeSubmitted(uint256);
    event ChangedMinLicenseFee(uint256);
    event NewAuctionDecrementSubmitted(uint256);
    event ChangedAuctionDecrement(uint256);
    event NewAuctionMultiplierSubmitted(uint256);
    event ChangedAuctionMultipler(uint256);
    event NewBondPercentDivSubmitted(uint256);
    event ChangedBondPercentDiv(uint256);
    event NewOwnerSplitSubmitted(uint256);
    event ChangedOwnerSplit(uint256);
}
// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

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-upgradeable/token/ERC20/IERC20Upgradeable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: @openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol



// SPDX-License-Identifier: MIT

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 initializer {
        __Context_init_unchained();
    }

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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.
 */
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() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

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



// SPDX-License-Identifier: MIT

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;
    }
}