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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { IBurner } from "./interfaces/IBurner.sol";
import { ILocator } from "./interfaces/ILocator.sol";
import { IOracleReportSanityChecker } from "./interfaces/IOracleReportSanityChecker.sol";
import { IWithdrawVault } from "./interfaces/IWithdrawVault.sol";
import { IWithdrawQueueERC721 } from "./interfaces/IWithdrawQueueERC721.sol";
import { ICgUSD } from "./interfaces/ICgUSD.sol";
import { IPausable } from "./interfaces/IPausable.sol";
import { UnstructuredStorage } from "./lib/UnstructuredStorage.sol";
import { StToken } from "./StToken.sol";

contract CgUSD is StToken, Ownable, Initializable, ICgUSD, IPausable {
    using SafeERC20 for IERC20;
    using UnstructuredStorage for bytes32;

    address public asset;

    bytes32 internal constant LOCATOR_POSITION =
        0x1718d90604c88f478732e809519e74c5c9a3a2b5dc95162ccc63d61800e42625; // keccak256("cygnus.CgUSD.locator")

    bytes32 internal constant BUFFERED_ASSET_POSITION =
        0x0afc87acedeee8c4193ad63118c06a9f961d4d6f3e34515e102d41596851b1a6; // keccak256("cygnus.CgUSD.bufferedAsset");

    bytes32 internal constant INVESTED_ASSET_POSITION =
        0x2c852a3a34b8266c1f4cf623581e3b3686edf6412c376db5da52f02d19ef925b; // keccak256("cygnus.CgUSD.investedAsset");

    struct OracleReportedData {
        uint256 reportTimestamp;
        uint256 timeElapsed;
        uint256 newInvestedAssets;
        uint256 withdrawalVaultBalance;
        uint256 sharesRequestedToBurn;
        uint256[] withdrawalFinalizationBatches;
        uint256 simulatedShareRate;
    }

    struct OracleReportContracts {
        address accountingOracle;
        address oracleReportSanityChecker;
        address burner;
        address withdrawQueue;
        address withdrawVault;
    }

    struct OracleReportContext {
        uint256 preTotalPooledAssets;
        uint256 preTotalShares;
        uint256 assetsToLockOnWithdrawalQueue;
        uint256 sharesToBurnFromWithdrawalQueue;
        uint256 simulatedSharesToBurn;
        uint256 sharesToBurn;
    }

    event AssetsDistributed(
        uint256 indexed reportTimestamp,
        uint256 withdrawalsWithdrawn,
        uint256 postBufferedAssets,
        uint256 postInvestedAssets
    );

    event TokenRebased(
        uint256 indexed reportTimestamp,
        uint256 timeElapsed,
        uint256 preTotalShares,
        uint256 preTotalAssets,
        uint256 postTotalShares,
        uint256 postTotalAssets
    );

    event LocatorSet(address locator);

    event WithdrawalsReceived(uint256 amount);

    event Submitted(address indexed sender, uint256 amount, address referral);

    event Invested(uint256 amount, uint256 postBufferedAssets, uint256 postInvestedAssets);

    constructor(
        address _asset,
        address _owner
    ) Ownable(_owner) {
        asset = _asset;
    }

    function initialize(address _locator) external initializer {
        _bootstrapInitialHolder();

        LOCATOR_POSITION.setStorageAddress(_locator);
        _approve(
            ILocator(_locator).withdrawQueue(),
            ILocator(_locator).burner(),
            INFINITE_ALLOWANCE
        );

        emit LocatorSet(_locator);
    }

    function decimals() external view override returns (uint8) {
        return IERC20Metadata(asset).decimals();
    }

    function resume() external onlyOwner {
        _unpause();
    }

    function pause() external onlyOwner {
        _pause();
    }

    function _getTotalPooledAssets() internal view override returns (uint256) {
        return _getBufferedAssets() + _getInvestedAssets();
    }

    function getTotalAssets() external view returns (uint256, uint256) {
        return (_getBufferedAssets(), _getInvestedAssets());
    }

    function canDeposit() public view returns (bool) {
        return !_withdrawalQueue().isBunkerModeActive() && !paused();
    }

    function mint(address _referral, uint256 _assetsAmount)
        external
        returns (uint256 sharesAmount)
    {
        require((sharesAmount = previewDeposit(_assetsAmount)) != 0, "ZERO_SHARES");

        // TODO: check if oracle price deviated

        IERC20(asset).safeTransferFrom(msg.sender, address(this), _assetsAmount);

        _mintShares(msg.sender, sharesAmount);

        _setBufferedAssets(_getBufferedAssets() + _assetsAmount);
        emit Submitted(msg.sender, _assetsAmount, _referral);

        _emitTransferAfterMintingShares(msg.sender, sharesAmount);
    }

    function invest(address _to, uint256 _assetsAmount) external onlyOwner {
        require(canDeposit(), "CAN_NOT_INVEST");

        IERC20(asset).safeTransfer(_to, _assetsAmount);

        uint256 postBufferedAssets = _getBufferedAssets() - _assetsAmount;
        uint256 postInvestedAssets = _getInvestedAssets() + _assetsAmount;
        _setBufferedAssets(postBufferedAssets);
        _setInvestedAssets(postInvestedAssets);
        emit Invested(_assetsAmount, postBufferedAssets, postInvestedAssets);
    }

    function handleOracleReport(
        uint256 _reportTimestamp,
        uint256 _timeElapsed,
        uint256 _newInvestedAssets,
        uint256 _withdrawalVaultBalance,
        uint256 _sharesRequestedToBurn,
        uint256[] calldata _withdrawalFinalizationBatches,
        uint256 _simulatedShareRate
    ) external whenNotPaused returns (uint256[3] memory postRebaseAmounts) {
        return _handleOracleReport(
            OracleReportedData(
                _reportTimestamp,
                _timeElapsed,
                _newInvestedAssets,
                _withdrawalVaultBalance,
                _sharesRequestedToBurn,
                _withdrawalFinalizationBatches,
                _simulatedShareRate
            )
        );
    }

    function _handleOracleReport(OracleReportedData memory _reportedData) internal returns (uint256[3] memory) {
        OracleReportContracts memory contracts = _loadOracleReportContracts();

        require(msg.sender == contracts.accountingOracle, "APP_AUTH_FAILED");
        require(_reportedData.reportTimestamp <= block.timestamp, "INVALID_REPORT_TIMESTAMP");

        OracleReportContext memory reportContext;

        // Step 1.
        // Take a snapshot of the current (pre-) state
        reportContext.preTotalPooledAssets = _getTotalPooledAssets();
        reportContext.preTotalShares = _getTotalShares();

        // Step 2.
        // Pass the report data to sanity checker (reverts if malformed)
        _checkAccountingOracleReport(contracts, _reportedData);

        // Step 3.
        // Pre-calculate the ether to lock for withdrawal queue and shares to be burnt
        // due to withdrawal requests to finalize
        if (_reportedData.withdrawalFinalizationBatches.length != 0) {
            (
                reportContext.assetsToLockOnWithdrawalQueue,
                reportContext.sharesToBurnFromWithdrawalQueue
            ) = _calculateWithdrawals(contracts, _reportedData);

            if (reportContext.sharesToBurnFromWithdrawalQueue > 0) {
                IBurner(contracts.burner).requestBurnShares(
                    contracts.withdrawQueue,
                    reportContext.sharesToBurnFromWithdrawalQueue
                );
            }
        }

        // Step 4.
        // Pass the accounting values to sanity checker to smoothen positive token rebase

        uint256 withdrawals;
        (
            withdrawals, reportContext.simulatedSharesToBurn, reportContext.sharesToBurn
        ) = IOracleReportSanityChecker(contracts.oracleReportSanityChecker).smoothenTokenRebase(
            reportContext.preTotalPooledAssets,
            reportContext.preTotalShares,
            _reportedData.withdrawalVaultBalance,
            _reportedData.sharesRequestedToBurn,
            reportContext.assetsToLockOnWithdrawalQueue,
            reportContext.sharesToBurnFromWithdrawalQueue
        );

        // Step 5.
        // Invoke finalization of the withdrawal requests (send ether to withdrawal queue, assign shares to be burnt)
        _collectRewardsAndProcessWithdrawals(
            contracts,
            withdrawals,
            _reportedData.withdrawalFinalizationBatches,
            _reportedData.simulatedShareRate,
            reportContext.assetsToLockOnWithdrawalQueue
        );

        // Step 6.
        // Update invested assets
        _setInvestedAssets(_reportedData.newInvestedAssets);

        emit AssetsDistributed(
            _reportedData.reportTimestamp,
            withdrawals,
            _getBufferedAssets(),
            _getInvestedAssets()
        );

        // Step 7.
        // Burn the previously requested shares
        if (reportContext.sharesToBurn > 0) {
            IBurner(contracts.burner).commitSharesToBurn(reportContext.sharesToBurn);
            _burnShares(contracts.burner, reportContext.sharesToBurn);
        }

        // Step 8.
        // Complete token rebase (emit an event)
        (
            uint256 postTotalShares,
            uint256 postTotalPooledAssets
        ) = _completeTokenRebase(
            _reportedData,
            reportContext
        );

        // Step 9. Sanity check for the provided simulated share rate
        if (_reportedData.withdrawalFinalizationBatches.length != 0) {
            IOracleReportSanityChecker(contracts.oracleReportSanityChecker).checkSimulatedShareRate(
                postTotalPooledAssets,
                postTotalShares,
                reportContext.assetsToLockOnWithdrawalQueue,
                reportContext.sharesToBurn - reportContext.simulatedSharesToBurn,
                _reportedData.simulatedShareRate
            );
        }

        return [postTotalPooledAssets, postTotalShares, withdrawals];
    }

    function _collectRewardsAndProcessWithdrawals(
        OracleReportContracts memory _contracts,
        uint256 _withdrawalsToWithdraw,
        uint256[] memory _withdrawalFinalizationBatches,
        uint256 _simulatedShareRate,
        uint256 _assetsToLockOnWithdrawalQueue
    ) internal {
        // withdraw withdrawals and put them to the buffer
        if (_withdrawalsToWithdraw > 0) {
            IWithdrawVault(_contracts.withdrawVault).withdrawWithdrawals(_withdrawalsToWithdraw);
        }

        // finalize withdrawals (send ether, assign shares for burning)
        if (_assetsToLockOnWithdrawalQueue > 0) { // TODO
            IWithdrawQueueERC721 withdrawalQueue = IWithdrawQueueERC721(_contracts.withdrawQueue);
            IERC20(asset).safeTransfer(_contracts.withdrawQueue, _assetsToLockOnWithdrawalQueue);
            withdrawalQueue.finalize(
                _withdrawalFinalizationBatches[_withdrawalFinalizationBatches.length - 1],
                _simulatedShareRate,
                _assetsToLockOnWithdrawalQueue
            );
        }

        uint256 postBufferedAssets = _getBufferedAssets() + _withdrawalsToWithdraw - _assetsToLockOnWithdrawalQueue;

        _setBufferedAssets(postBufferedAssets);
    }

    function _calculateWithdrawals(
        OracleReportContracts memory _contracts,
        OracleReportedData memory _reportedData
    ) internal view returns (
        uint256 assetsToLock, uint256 sharesToBurn
    ) {
        IWithdrawQueueERC721 withdrawalQueue = IWithdrawQueueERC721(_contracts.withdrawQueue);

        //if (!withdrawalQueue.isPaused()) { TODO
        {
            IOracleReportSanityChecker(_contracts.oracleReportSanityChecker).checkWithdrawalQueueOracleReport(
                _reportedData.withdrawalFinalizationBatches[_reportedData.withdrawalFinalizationBatches.length - 1],
                _reportedData.reportTimestamp
            );

            (assetsToLock, sharesToBurn) = withdrawalQueue.prefinalize(
                _reportedData.withdrawalFinalizationBatches,
                _reportedData.simulatedShareRate
            );
        }
    }

    function _checkAccountingOracleReport(
        OracleReportContracts memory _contracts,
        OracleReportedData memory _reportedData
    ) internal view {
        IOracleReportSanityChecker(_contracts.oracleReportSanityChecker).checkAccountingOracleReport(
            _reportedData.timeElapsed,
            _reportedData.withdrawalVaultBalance,
            _reportedData.sharesRequestedToBurn
        );
    }

    function _completeTokenRebase(
        OracleReportedData memory _reportedData,
        OracleReportContext memory _reportContext
    ) internal returns (uint256 postTotalShares, uint256 postTotalPooledAssets) {
        postTotalShares = _getTotalShares();
        postTotalPooledAssets = _getTotalPooledAssets();

        emit TokenRebased(
            _reportedData.reportTimestamp,
            _reportedData.timeElapsed,
            _reportContext.preTotalShares,
            _reportContext.preTotalPooledAssets,
            postTotalShares,
            postTotalPooledAssets
        );
    }

    function _loadOracleReportContracts() internal view returns (OracleReportContracts memory ret) {
        (
            ret.accountingOracle,
            ret.oracleReportSanityChecker,
            ret.burner,
            ret.withdrawQueue,
            ret.withdrawVault
        ) = getLocator().oracleReportComponents();
    }

    function getLocator() public view returns (ILocator) {
        return ILocator(LOCATOR_POSITION.getStorageAddress());
    }

    function _withdrawalQueue() internal view returns (IWithdrawQueueERC721) {
        return IWithdrawQueueERC721(getLocator().withdrawQueue());
    }

    function _getBufferedAssets() internal view returns (uint256) {
        return BUFFERED_ASSET_POSITION.getStorageUint256();
    }

    function _setBufferedAssets(uint256 _newBufferedAssets) internal {
        BUFFERED_ASSET_POSITION.setStorageUint256(_newBufferedAssets);
    }

    function _getInvestedAssets() internal view returns (uint256) {
        return INVESTED_ASSET_POSITION.getStorageUint256();
    }

    function _setInvestedAssets(uint256 _newInvestedAssets) internal {
        INVESTED_ASSET_POSITION.setStorageUint256(_newInvestedAssets);
    }

    function _bootstrapInitialHolder() internal {
        uint256 balance = IERC20(asset).balanceOf(address(this));
        assert(balance != 0);

        if (_getTotalShares() == 0) {
            _setBufferedAssets(balance);
            emit Submitted(INITIAL_TOKEN_HOLDER, balance, address(0));
            _mintInitialShares(balance);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reininitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._initialized = 1;
        if (isTopLevelCall) {
            $._initializing = true;
        }
        _;
        if (isTopLevelCall) {
            $._initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._initialized = version;
        $._initializing = true;
        _;
        $._initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

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

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        assembly {
            $.slot := INITIALIZABLE_STORAGE
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../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;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @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);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert FailedInnerCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Context.sol)

pragma solidity ^0.8.20;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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 {
    bool private _paused;

    /**
     * @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);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

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

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

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

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

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @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());
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IBurner {
    function commitSharesToBurn(uint256 _stETHSharesToBurn) external;

    function requestBurnShares(address _from, uint256 _sharesAmount) external;

    function getSharesRequestedToBurn() external view returns (uint256 coverShares, uint256 nonCoverShares);

    function getCoverSharesBurnt() external view returns (uint256);

    function getNonCoverSharesBurnt() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface ICgUSD {
    function asset() external view returns (address);

    function getTotalAssets() external view returns (uint256, uint256);

    function mint(address _referral, uint256 _assetsAmount)
        external
        returns (uint256);

    function invest(address _to, uint256 _assetsAmount) external;

    function handleOracleReport(
        uint256 _reportTimestamp,
        uint256 _timeElapsed,
        uint256 _newInvestedAssets,
        uint256 _withdrawalVaultBalance,
        uint256 _sharesRequestedToBurn,
        uint256[] calldata _withdrawalFinalizationBatches,
        uint256 _simulatedShareRate
    ) external returns (uint256[3] memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface ILocator {
    function accountingOracle() external view returns (address);
    function burner() external view returns (address);
    function priceOracle() external view returns (address);
    function withdrawQueue() external view returns (address);
    function withdrawVault() external view returns (address);
    function underlyingToken() external view returns (address);
    function stToken() external view returns (address);
    function treasury() external view returns (address);
    function oracleReportSanityChecker() external view returns (address);

    function coreComponents() external view returns (
        address oracleReportSanityChecker,
        address treasury,
        address withdrawalQueue,
        address withdrawalVault
    );

    function oracleReportComponents() external view returns (
        address accountingOracle,
        address oracleReportSanityChecker,
        address burner,
        address withdrawalQueue,
        address withdrawalVault
    );
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IOracleReportSanityChecker {
    function checkAccountingOracleReport(
        uint256 _timeElapsed,
        uint256 _withdrawalVaultBalance,
        uint256 _sharesRequestedToBurn
    ) external view;

    function smoothenTokenRebase(
        uint256 _preTotalPooledAssets,
        uint256 _preTotalShares,
        uint256 _withdrawalVaultBalance,
        uint256 _sharesRequestedToBurn,
        uint256 _assetsToLockForWithdrawals,
        uint256 _newSharesToBurnForWithdrawals
    ) external view returns (
        uint256 withdrawals,
        uint256 simulatedSharesToBurn,
        uint256 sharesToBurn
    );

    function checkWithdrawalQueueOracleReport(
        uint256 _lastFinalizableRequestId,
        uint256 _reportTimestamp
    ) external view;

    function checkSimulatedShareRate(
        uint256 _postTotalPooledAssets,
        uint256 _postTotalShares,
        uint256 _assetsLockedOnWithdrawalQueue,
        uint256 _sharesBurntDueToWithdrawals,
        uint256 _simulatedShareRate
    ) external view;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IPausable {
    function pause() external;

    function resume() external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { IWithdrawQueueBase } from "./IWithdrawQueueBase.sol";

interface IWithdrawQueue is IWithdrawQueueBase {
    struct PermitInput {
        uint256 value;
        uint256 deadline;
        uint8 v;
        bytes32 r;
        bytes32 s;
    }

    function requestWithdrawals(
        uint256[] calldata _amounts,
        address _owner
    ) external returns (uint256[] memory);

    function requestWithdrawalsWstToken(
        uint256[] calldata _amounts,
        address _owner
    ) external returns (uint256[] memory);

    function requestWithdrawalsWithPermit(
        uint256[] calldata _amounts,
        address _owner,
        PermitInput calldata _permit
    ) external returns (uint256[] memory);

    function requestWithdrawalsWstTokenWithPermit(
        uint256[] calldata _amounts,
        address _owner,
        PermitInput calldata _permit
    ) external returns (uint256[] memory);

    function getWithdrawalRequests(address _owner) external view returns (uint256[] memory);

    function getWithdrawalStatus(uint256[] calldata _requestIds)
        external
        view
        returns (WithdrawalRequestStatus[] memory);

    function getClaimableAssets(uint256[] calldata _requestIds, uint256[] calldata _hints)
        external
        view
        returns (uint256[] memory);

    function claimWithdrawalsTo(
        uint256[] calldata _requestIds,
        uint256[] calldata _hints,
        address _recipient
    ) external;

    function claimWithdrawals(uint256[] calldata _requestIds, uint256[] calldata _hints) external;

    function claimWithdrawal(uint256 _requestId) external;

    function findCheckpointHints(uint256[] calldata _requestIds, uint256 _firstIndex, uint256 _lastIndex)
        external
        view
        returns (uint256[] memory);

    function onOracleReport(
        bool _isBunkerModeNow,
        uint256 _bunkerStartTimestamp,
        uint256 _currentReportTimestamp
    ) external;

    function isBunkerModeActive() external view returns (bool);

    function bunkerModeSinceTimestamp() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IWithdrawQueueBase {
    struct WithdrawalRequestStatus {
        uint256 amountOfAssets;
        uint256 amountOfShares;
        address owner;
        uint256 timestamp;
        bool isFinalized;
        bool isClaimed;
    }

    struct BatchesCalculationState {
        uint256 remainingAssetsBudget;
        bool finished;
        uint256[36] batches;
        uint256 batchesLength;
    }

    function getLastRequestId() external view returns (uint256);

    function getLastFinalizedRequestId() external view returns (uint256);

    function getLockedAssetsAmount() external view returns (uint256);

    function getLastCheckpointIndex() external view returns (uint256);

    function unfinalizedRequestNumber() external view returns (uint256);

    function unfinalizedAssets() external view returns (uint256);

    function calculateFinalizationBatches(
        uint256 _maxShareRate,
        uint256 _maxTimestamp,
        uint256 _maxRequestsPerCall,
        BatchesCalculationState memory _state
    ) external view returns (BatchesCalculationState memory);

    function prefinalize(uint256[] calldata _batches, uint256 _maxShareRate)
        external
        view
        returns (uint256 assetsToLock, uint256 sharesToBurn);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { IWithdrawQueue } from "./IWithdrawQueue.sol";

interface IWithdrawQueueERC721 is IWithdrawQueue {
    function finalize(
        uint256 _lastRequestIdToBeFinalized,
        uint256 _maxShareRate,
        uint256 _amount
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IWithdrawVault {
    function asset() external view returns (address);
    function withdrawWithdrawals(uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

library UnstructuredStorage {
    function getStorageBool(bytes32 position) internal view returns (bool data) {
        assembly { data := sload(position) }
    }

    function getStorageAddress(bytes32 position) internal view returns (address data) {
        assembly { data := sload(position) }
    }

    function getStorageBytes32(bytes32 position) internal view returns (bytes32 data) {
        assembly { data := sload(position) }
    }

    function getStorageUint256(bytes32 position) internal view returns (uint256 data) {
        assembly { data := sload(position) }
    }

    function setStorageBool(bytes32 position, bool data) internal {
        assembly { sstore(position, data) }
    }

    function setStorageAddress(bytes32 position, address data) internal {
        assembly { sstore(position, data) }
    }

    function setStorageBytes32(bytes32 position, bytes32 data) internal {
        assembly { sstore(position, data) }
    }

    function setStorageUint256(bytes32 position, uint256 data) internal {
        assembly { sstore(position, data) }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { Pausable } from "@openzeppelin/contracts/utils/Pausable.sol";
import { FixedPointMathLib } from "solmate/src/utils/FixedPointMathLib.sol";
import { UnstructuredStorage } from "./lib/UnstructuredStorage.sol";

abstract contract StToken is IERC20, Pausable {
    using FixedPointMathLib for uint256;
    using UnstructuredStorage for bytes32;

    address constant internal INITIAL_TOKEN_HOLDER = address(0xDEAD);
    uint256 constant internal INFINITE_ALLOWANCE = type(uint256).max;

    mapping (address => uint256) private shares;

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

    bytes32 internal constant TOTAL_SHARES_POSITION =
        0x83da5a14a875cd105129c6639940ca67c63bf644cb010f348eec1dbad1a679be; // keccak256('cygnus.StToken.totalShares')

    event TransferShares(
        address indexed from,
        address indexed to,
        uint256 sharesValue
    );

    event SharesBurnt(
        address indexed account,
        uint256 preRebaseTokenAmount,
        uint256 postRebaseTokenAmount,
        uint256 sharesAmount
    );

    function name() external pure returns (string memory) {
        return "Cygnus Global USD";
    }

    function symbol() external pure returns (string memory) {
        return "cgUSD";
    }

    function decimals() external view virtual returns (uint8);

    function totalSupply() external view returns (uint256) {
        return _getTotalPooledAssets();
    }

    function getTotalPooledAssets() external view returns (uint256) {
        return _getTotalPooledAssets();
    }

    function balanceOf(address _account) external view returns (uint256) {
        return convertToAssets(_sharesOf(_account));
    }

    function transfer(address _recipient, uint256 _amount) external returns (bool) {
        _transfer(msg.sender, _recipient, _amount);
        return true;
    }

    function allowance(address _owner, address _spender) external view returns (uint256) {
        return allowances[_owner][_spender];
    }

    function approve(address _spender, uint256 _amount) external returns (bool) {
        _approve(msg.sender, _spender, _amount);
        return true;
    }

    function transferFrom(address _sender, address _recipient, uint256 _amount) external returns (bool) {
        _spendAllowance(_sender, msg.sender, _amount);
        _transfer(_sender, _recipient, _amount);
        return true;
    }

    function increaseAllowance(address _spender, uint256 _addedValue) external returns (bool) {
        _approve(msg.sender, _spender, allowances[msg.sender][_spender] + _addedValue);
        return true;
    }

    function decreaseAllowance(address _spender, uint256 _subtractedValue) external returns (bool) {
        uint256 currentAllowance = allowances[msg.sender][_spender];
        require(currentAllowance >= _subtractedValue, "ALLOWANCE_BELOW_ZERO");
        _approve(msg.sender, _spender, currentAllowance - _subtractedValue);
        return true;
    }

    function getTotalShares() external view returns (uint256) {
        return _getTotalShares();
    }

    function sharesOf(address _account) external view returns (uint256) {
        return _sharesOf(_account);
    }

    function transferShares(address _recipient, uint256 _sharesAmount) external returns (uint256) {
        _transferShares(msg.sender, _recipient, _sharesAmount);
        uint256 tokensAmount = convertToAssets(_sharesAmount);
        _emitTransferEvents(msg.sender, _recipient, tokensAmount, _sharesAmount);
        return tokensAmount;
    }

    function transferSharesFrom(
        address _sender, address _recipient, uint256 _sharesAmount
    ) external returns (uint256) {
        uint256 tokensAmount = convertToAssets(_sharesAmount);
        _spendAllowance(_sender, msg.sender, tokensAmount);
        _transferShares(_sender, _recipient, _sharesAmount);
        _emitTransferEvents(_sender, _recipient, tokensAmount, _sharesAmount);
        return tokensAmount;
    }

    function _getTotalPooledAssets() internal view virtual returns (uint256);

    function _transfer(address _sender, address _recipient, uint256 _amount) internal {
        uint256 _sharesToTransfer = convertToShares(_amount);
        _transferShares(_sender, _recipient, _sharesToTransfer);
        _emitTransferEvents(_sender, _recipient, _amount, _sharesToTransfer);
    }

    function _approve(address _owner, address _spender, uint256 _amount) internal {
        require(_owner != address(0), "APPROVE_FROM_ZERO_ADDR");
        require(_spender != address(0), "APPROVE_TO_ZERO_ADDR");

        allowances[_owner][_spender] = _amount;
        emit Approval(_owner, _spender, _amount);
    }

    function _spendAllowance(address _owner, address _spender, uint256 _amount) internal {
        uint256 currentAllowance = allowances[_owner][_spender];
        if (currentAllowance != INFINITE_ALLOWANCE) {
            require(currentAllowance >= _amount, "ALLOWANCE_EXCEEDED");
            _approve(_owner, _spender, currentAllowance - _amount);
        }
    }

    function _getTotalShares() internal view returns (uint256) {
        return TOTAL_SHARES_POSITION.getStorageUint256();
    }

    function _sharesOf(address _account) internal view returns (uint256) {
        return shares[_account];
    }

    function _transferShares(address _sender, address _recipient, uint256 _sharesAmount) internal {
        _requireNotPaused();
        require(_sender != address(0), "TRANSFER_FROM_ZERO_ADDR");
        require(_recipient != address(0), "TRANSFER_TO_ZERO_ADDR");
        require(_recipient != address(this), "TRANSFER_TO_STETH_CONTRACT");

        uint256 currentSenderShares = shares[_sender];
        require(_sharesAmount <= currentSenderShares, "BALANCE_EXCEEDED");

        shares[_sender] = currentSenderShares - _sharesAmount;
        shares[_recipient] = shares[_recipient] + _sharesAmount;
    }

    function _mintShares(address _recipient, uint256 _sharesAmount) internal returns (uint256 newTotalShares) {
        require(_recipient != address(0), "MINT_TO_ZERO_ADDR");

        newTotalShares = _getTotalShares() + _sharesAmount;
        TOTAL_SHARES_POSITION.setStorageUint256(newTotalShares);

        shares[_recipient] = shares[_recipient] + _sharesAmount;
    }

    function _burnShares(address _account, uint256 _sharesAmount) internal returns (uint256 newTotalShares) {
        require(_account != address(0), "BURN_FROM_ZERO_ADDR");

        uint256 accountShares = shares[_account];
        require(_sharesAmount <= accountShares, "BALANCE_EXCEEDED");

        uint256 preRebaseTokenAmount = convertToAssets(_sharesAmount);

        newTotalShares = _getTotalShares() - _sharesAmount;
        TOTAL_SHARES_POSITION.setStorageUint256(newTotalShares);

        shares[_account] = accountShares - _sharesAmount;

        uint256 postRebaseTokenAmount = convertToAssets(_sharesAmount);

        emit SharesBurnt(_account, preRebaseTokenAmount, postRebaseTokenAmount, _sharesAmount);
    }

    function convertToShares(uint256 _assetsAmount) public view virtual returns (uint256) {
        return _assetsAmount.mulDivDown(_getTotalShares(), _getTotalPooledAssets());
    }

    function convertToAssets(uint256 _sharesAmount) public view virtual returns (uint256) {
        return _sharesAmount.mulDivDown(_getTotalPooledAssets(), _getTotalShares());
    }

    function _emitTransferEvents(address _from, address _to, uint _tokenAmount, uint256 _sharesAmount) internal {
        emit Transfer(_from, _to, _tokenAmount);
        emit TransferShares(_from, _to, _sharesAmount);
    }

    function _emitTransferAfterMintingShares(address _to, uint256 _sharesAmount) internal {
        _emitTransferEvents(address(0), _to, convertToAssets(_sharesAmount), _sharesAmount);
    }

    function _mintInitialShares(uint256 _sharesAmount) internal {
        _mintShares(INITIAL_TOKEN_HOLDER, _sharesAmount);
        _emitTransferAfterMintingShares(INITIAL_TOKEN_HOLDER, _sharesAmount);
    }

    function previewDeposit(uint256 _assetsAmount) public view virtual returns (uint256) {
        return convertToShares(_assetsAmount);
    }

    function previewMint(uint256 _sharesAmount) public view virtual returns (uint256) {
        return _sharesAmount.mulDivUp(_getTotalPooledAssets(), _getTotalShares());
    }

    function previewWithdraw(uint256 _assetsAmount) public view virtual returns (uint256) {
        return _assetsAmount.mulDivUp(_getTotalShares(), _getTotalPooledAssets());
    }

    function previewRedeem(uint256 _sharesAmount) public view virtual returns (uint256) {
        return convertToAssets(_sharesAmount);
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Arithmetic library with operations for fixed-point numbers.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol)
/// @author Inspired by USM (https://github.com/usmfum/USM/blob/master/contracts/WadMath.sol)
library FixedPointMathLib {
    /*//////////////////////////////////////////////////////////////
                    SIMPLIFIED FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    uint256 internal constant MAX_UINT256 = 2**256 - 1;

    uint256 internal constant WAD = 1e18; // The scalar of ETH and most ERC20s.

    function mulWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, y, WAD); // Equivalent to (x * y) / WAD rounded down.
    }

    function mulWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, y, WAD); // Equivalent to (x * y) / WAD rounded up.
    }

    function divWadDown(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivDown(x, WAD, y); // Equivalent to (x * WAD) / y rounded down.
    }

    function divWadUp(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulDivUp(x, WAD, y); // Equivalent to (x * WAD) / y rounded up.
    }

    /*//////////////////////////////////////////////////////////////
                    LOW LEVEL FIXED POINT OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function mulDivDown(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // Divide x * y by the denominator.
            z := div(mul(x, y), denominator)
        }
    }

    function mulDivUp(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Equivalent to require(denominator != 0 && (y == 0 || x <= type(uint256).max / y))
            if iszero(mul(denominator, iszero(mul(y, gt(x, div(MAX_UINT256, y)))))) {
                revert(0, 0)
            }

            // If x * y modulo the denominator is strictly greater than 0,
            // 1 is added to round up the division of x * y by the denominator.
            z := add(gt(mod(mul(x, y), denominator), 0), div(mul(x, y), denominator))
        }
    }

    function rpow(
        uint256 x,
        uint256 n,
        uint256 scalar
    ) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            switch x
            case 0 {
                switch n
                case 0 {
                    // 0 ** 0 = 1
                    z := scalar
                }
                default {
                    // 0 ** n = 0
                    z := 0
                }
            }
            default {
                switch mod(n, 2)
                case 0 {
                    // If n is even, store scalar in z for now.
                    z := scalar
                }
                default {
                    // If n is odd, store x in z for now.
                    z := x
                }

                // Shifting right by 1 is like dividing by 2.
                let half := shr(1, scalar)

                for {
                    // Shift n right by 1 before looping to halve it.
                    n := shr(1, n)
                } n {
                    // Shift n right by 1 each iteration to halve it.
                    n := shr(1, n)
                } {
                    // Revert immediately if x ** 2 would overflow.
                    // Equivalent to iszero(eq(div(xx, x), x)) here.
                    if shr(128, x) {
                        revert(0, 0)
                    }

                    // Store x squared.
                    let xx := mul(x, x)

                    // Round to the nearest number.
                    let xxRound := add(xx, half)

                    // Revert if xx + half overflowed.
                    if lt(xxRound, xx) {
                        revert(0, 0)
                    }

                    // Set x to scaled xxRound.
                    x := div(xxRound, scalar)

                    // If n is even:
                    if mod(n, 2) {
                        // Compute z * x.
                        let zx := mul(z, x)

                        // If z * x overflowed:
                        if iszero(eq(div(zx, x), z)) {
                            // Revert if x is non-zero.
                            if iszero(iszero(x)) {
                                revert(0, 0)
                            }
                        }

                        // Round to the nearest number.
                        let zxRound := add(zx, half)

                        // Revert if zx + half overflowed.
                        if lt(zxRound, zx) {
                            revert(0, 0)
                        }

                        // Return properly scaled zxRound.
                        z := div(zxRound, scalar)
                    }
                }
            }
        }
    }

    /*//////////////////////////////////////////////////////////////
                        GENERAL NUMBER UTILITIES
    //////////////////////////////////////////////////////////////*/

    function sqrt(uint256 x) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            let y := x // We start y at x, which will help us make our initial estimate.

            z := 181 // The "correct" value is 1, but this saves a multiplication later.

            // This segment is to get a reasonable initial estimate for the Babylonian method. With a bad
            // start, the correct # of bits increases ~linearly each iteration instead of ~quadratically.

            // We check y >= 2^(k + 8) but shift right by k bits
            // each branch to ensure that if x >= 256, then y >= 256.
            if iszero(lt(y, 0x10000000000000000000000000000000000)) {
                y := shr(128, y)
                z := shl(64, z)
            }
            if iszero(lt(y, 0x1000000000000000000)) {
                y := shr(64, y)
                z := shl(32, z)
            }
            if iszero(lt(y, 0x10000000000)) {
                y := shr(32, y)
                z := shl(16, z)
            }
            if iszero(lt(y, 0x1000000)) {
                y := shr(16, y)
                z := shl(8, z)
            }

            // Goal was to get z*z*y within a small factor of x. More iterations could
            // get y in a tighter range. Currently, we will have y in [256, 256*2^16).
            // We ensured y >= 256 so that the relative difference between y and y+1 is small.
            // That's not possible if x < 256 but we can just verify those cases exhaustively.

            // Now, z*z*y <= x < z*z*(y+1), and y <= 2^(16+8), and either y >= 256, or x < 256.
            // Correctness can be checked exhaustively for x < 256, so we assume y >= 256.
            // Then z*sqrt(y) is within sqrt(257)/sqrt(256) of sqrt(x), or about 20bps.

            // For s in the range [1/256, 256], the estimate f(s) = (181/1024) * (s+1) is in the range
            // (1/2.84 * sqrt(s), 2.84 * sqrt(s)), with largest error when s = 1 and when s = 256 or 1/256.

            // Since y is in [256, 256*2^16), let a = y/65536, so that a is in [1/256, 256). Then we can estimate
            // sqrt(y) using sqrt(65536) * 181/1024 * (a + 1) = 181/4 * (y + 65536)/65536 = 181 * (y + 65536)/2^18.

            // There is no overflow risk here since y < 2^136 after the first branch above.
            z := shr(18, mul(z, add(y, 65536))) // A mul() is saved from starting z at 181.

            // Given the worst case multiplicative error of 2.84 above, 7 iterations should be enough.
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))
            z := shr(1, add(z, div(x, z)))

            // If x+1 is a perfect square, the Babylonian method cycles between
            // floor(sqrt(x)) and ceil(sqrt(x)). This statement ensures we return floor.
            // See: https://en.wikipedia.org/wiki/Integer_square_root#Using_only_integer_division
            // Since the ceil is rare, we save gas on the assignment and repeat division in the rare case.
            // If you don't care whether the floor or ceil square root is returned, you can remove this statement.
            z := sub(z, lt(div(x, z), z))
        }
    }

    function unsafeMod(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Mod x by y. Note this will return
            // 0 instead of reverting if y is zero.
            z := mod(x, y)
        }
    }

    function unsafeDiv(uint256 x, uint256 y) internal pure returns (uint256 r) {
        /// @solidity memory-safe-assembly
        assembly {
            // Divide x by y. Note this will return
            // 0 instead of reverting if y is zero.
            r := div(x, y)
        }
    }

    function unsafeDivUp(uint256 x, uint256 y) internal pure returns (uint256 z) {
        /// @solidity memory-safe-assembly
        assembly {
            // Add 1 to x * y if x % y > 0. Note this will
            // return 0 instead of reverting if y is zero.
            z := add(gt(mod(x, y), 0), div(x, y))
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• PeckShield - Dec 11th, 2023 - Security Audit Report

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{"inputs":[{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"uint256","name":"_sharesAmount","type":"uint256"}],"name":"transferShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_sender","type":"address"},{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"uint256","name":"_sharesAmount","type":"uint256"}],"name":"transferSharesFrom","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda02913000000000000000000000000fecab866b450b97db38500898e9272c1d18918b7

-----Decoded View---------------
Arg [0] : _asset (address): 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Arg [1] : _owner (address): 0xfECAB866b450b97dB38500898e9272c1D18918b7

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda02913
Arg [1] : 000000000000000000000000fecab866b450b97db38500898e9272c1d18918b7