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// SPDX-License-Identifier: MIT
// ⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀
// ⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀
// ⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⢠⣤⣤⣤⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀
// ⠉⠻⣿⡟⠛⠛⠻⣿⣄⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⣿⣿⡀⡀⡀⡀⡀⡀⡀⠙⢿⣿⡟⠁⡀⡀⠙⣿⠟⠁
// ⡀⡀⣿⡇⡀⡀⡀⢸⣿⡆⡀⡀⡀⡀⡀⣀⣀⡀⡀⡀⡀⡀⡀⡀⡀⣀⣀⣀⡀⡀⡀⡀⣿⣿⡀⡀⡀⡀⡀⡀⡀⡀⡀⢿⣿⡄⡀⡀⣾⠃⡀⡀
// ⡀⡀⣿⡇⡀⡀⡀⢸⣿⠃⡀⡀⡀⣾⡿⠉⠉⠙⣿⣄⡀⡀⡀⣴⣿⠋⠉⠻⣿⡄⡀⡀⣿⣿⡀⡀⠙⣿⠿⠉⡀⡀⡀⡀⢻⣿⣄⣿⠁⡀⡀⡀
// ⡀⡀⣿⣇⣀⣀⣤⡿⠋⡀⡀⡀⣼⣿⡀⡀⡀⡀⢸⣿⡀⡀⢠⣿⠃⡀⡀⡀⠛⡀⡀⡀⣿⣿⡀⢀⡿⠁⡀⡀⡀⡀⡀⡀⡀⢻⣿⡄⡀⡀⡀⡀
// ⡀⡀⣿⡏⠉⠻⣿⣄⡀⡀⡀⡀⣿⣿⡀⡀⡀⡀⠘⣿⡇⡀⢸⣿⡀⡀⡀⡀⡀⡀⡀⡀⣿⣿⣴⣿⣦⡀⡀⡀⡀⡀⡀⡀⢠⡿⢻⣿⡄⡀⡀⡀
// ⡀⡀⣿⡇⡀⡀⠻⣿⣆⡀⡀⡀⢿⣿⡀⡀⡀⡀⢸⣿⠁⡀⢸⣿⡀⡀⡀⡀⡀⡀⡀⡀⣿⣿⡀⠘⣿⣧⡀⡀⡀⡀⡀⣰⡟⡀⡀⢻⣿⡄⡀⡀
// ⡀⢀⣿⣧⡀⡀⡀⠻⣿⣦⡀⡀⠈⣿⣄⡀⡀⡀⣾⡿⡀⡀⡀⢿⣷⡀⡀⡀⣀⡄⡀⡀⣿⣿⡀⡀⠈⣿⣷⡀⡀⡀⣴⣿⡀⡀⡀⡀⢻⣿⣄⡀
// ⠛⠛⠛⠛⠛⡀⡀⡀⠈⠛⠛⡀⡀⡀⠛⠿⠿⠟⠋⡀⡀⡀⡀⡀⠙⠿⠿⠿⠛⡀⠘⠛⠛⠛⠛⡀⡀⡀⠙⠛⠛⠛⠛⠛⠛⡀⡀⠛⠛⠛⠛⠛
// ⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀
// ⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀⡀

pragma solidity ^0.8.4;

import "iface.sol";
import "BytesLib.sol";
import "SafeERC20.sol";
import "Initializable.sol";
import "AccessControlUpgradeable.sol";
import "PausableUpgradeable.sol";
import "ReentrancyGuardUpgradeable.sol";


/**
 * @title RockX Ethereum 2.0 Staking Contract
 *
 * Description:
 * 
 * ───╔═╦═╗─╔╗╔═╗──────╔╗──╔╗╔╗─╔╦╗╔╗─╔═╗─╔╗───────╔╦╗
 * ╔═╗║═╣═╬═╣╚╣═╣╔══╗╔╗╠╬═╗║╚╬╬╗╠╣╚╬╬═╣═╣╔╝╚╗╔═╦═╦╦╬╣╚╦╦╗
 * ║╬╚╬═╠═║╩╣╔╬═║╠══╣║╚╣║╬╚╣╬║║╚╣║╔╣║╩╬═║╚╗╔╝║╩╣╬║║║║╔╣║║
 * ╚══╩═╩═╩═╩═╩═╝╚══╝╚═╩╩══╩═╩╩═╩╩═╩╩═╩═╝─╚╝─╚═╩╗╠═╩╩═╬╗║
 * ─────────────────────────────────────────────╚╝────╚═╝
 * 
 * Term:
 *  ExchangeRatio:              Exchange Ratio of xETH to ETH, normally >= 1.0
 *  TotalXETH:                  Total Supply of xETH
 *  TotalStaked:                Total Ethers Staked to Validators
 *  TotalDebts:                 Total unpaid debts(generated from redeemFromValidators), 
 *                              awaiting to be paid by turn off validators to clean debts.
 *  TotalPending:               Pending Ethers(<32 Ethers), awaiting to be staked
 *  RewardDebts:                The amount re-staked into TotalPending
 *
 *  AccountedUserRevenue:       Overall Net revenue which belongs to all xETH holders(excluded re-staked amount)
 *  ReportedValidators:         Latest Reported Validator Count
 *  ReportedValidatorBalance:   Latest Reported Validator Overall Balance
 *  RecentReceived:             The Amount this contract receives recently.
 *  CurrentReserve:             Assets Under Management
 *
 * Lemma 1: (AUM)
 *
 *          CurrentReserve = TotalPending + TotalStaked + AccountedUserRevenue - TotalDebts - RewardDebts
 *
 * Lemma 2: (Exchange Ratio)
 *
 *          ExchangeRatio = CurrentReserve / TotalXETH
 *
 * Rule 1: (function mint) For every mint operation, the ethers pays debt in priority the reset will be put in TotalPending(deprecated),
 *          ethersToMint:               The amount user deposits
 *
 *          (deprecated)
 *          TotalDebts = TotalDebts - Min(ethersToMint, TotalDebts)    
 *          TotalPending = TotalPending + Max(0, ethersToMint - TotalDebts)
 *          TotalXETH = TotalXETH + ethersToMint / ExchangeRatio
 *          
 *          (updated)
 *          TotalPending = TotalPending + ethersToMint
 *          TotalXETH = TotalXETH + ethersToMint / ExchangeRatio
 *
 * Rule 2: (function mint) At any time TotalPending has more than 32 Ethers, It will be staked, TotalPending
 *          moves to TotalStaked and keeps TotalPending less than 32 Ether.
 *
 *          TotalPending = TotalPending - ⌊TotalPending/32ETH⌋ * 32ETH
 *          TotalStaked = TotalStaked + ⌊TotalPending/32ETH⌋ * 32ETH
 *
 * Rule 3: (function validatorStopped) Whenever a validator stopped, all value pays debts in priority, then:
 *          valueStopped:               The value sent-back via receive() funtion
 *          amountUnstaked:             The amount of unstaked node (base 32ethers)
 *          validatorStopped:           The count of validator stopped
 *          
 *          incrRewardDebt := valueStopped - amountUnstaked
 *          RewardDebts = RewardDebt + incrRewardDebt
 *          RecentReceived = RecentReceived + valueStopped
 *          TotalPending = TotalPending + Max(0, amountUnstaked - TotalDebts) + incrRewardDebt
 *          TotalStaked = TotalStaked - validatorStopped * 32 ETH
 *
 * Rule 4.1: (function pushBeacon) Oracle push balance, rebase if new validator is alive:
 *          aliveValidator:             The count of validators alive
 *          
 *          RewardBase = ReportedValidatorBalance + Max(0, aliveValidator - ReportedValidators) * 32 ETH
 *
 * Rule 4.2: (function pushBeacon) Oracle push balance, revenue calculation:
 *          aliveBalance:               The balance of current alive validators
 *
 *          r := aliveBalance + RecentReceived - RewardBase
 *          AccountedUserRevenue = AccountedUserRevenue + r * (1000 - managerFeeShare) / 1000
 *          RecentReceived = 0
 *          ReportedValidators = aliveValidator
 *          ReportedValidatorBalance = aliveBalance
 *
 * CHANGELOG
 *      v1(20230509):     remove the use of aliveBalance after shanghai merge, this parameter is omited in pushBeacon
 *
 */
contract RockXStaking is Initializable, PausableUpgradeable, AccessControlUpgradeable, ReentrancyGuardUpgradeable {
    using SafeERC20 for IERC20;
    using Address for address payable;
    using Address for address;

    // stored credentials
    struct ValidatorCredential {
        bytes pubkey;
        bytes signature;
        bool stopped;
        bool restaking; // UPDATE(20240115) : flag the validator is using liquid staking address
    }

    // track ether debts to return to async caller
    struct Debt {
        address account;
        uint256 amount;
    }

    /**
        Incorrect storage preservation:

        |Implementation_v0   |Implementation_v1        |
        |--------------------|-------------------------|
        |address _owner      |address _lastContributor | <=== Storage collision!
        |mapping _balances   |address _owner           |
        |uint256 _supply     |mapping _balances        |
        |...                 |uint256 _supply          |
        |                    |...                      |
        Correct storage preservation:

        |Implementation_v0   |Implementation_v1        |
        |--------------------|-------------------------|
        |address _owner      |address _owner           |
        |mapping _balances   |mapping _balances        |
        |uint256 _supply     |uint256 _supply          |
        |...                 |address _lastContributor | <=== Storage extension.
        |                    |...                      |
    */

    // Always extend storage instead of modifying it
    // Variables in implementation v0 
    bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE");
    bytes32 public constant ORACLE_ROLE = keccak256("ORACLE_ROLE");
    bytes32 public constant REGISTRY_ROLE = keccak256("REGISTRY_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
    uint256 public constant DEPOSIT_SIZE = 32 ether;

    uint256 private constant MULTIPLIER = 1e18; 
    uint256 private constant DEPOSIT_AMOUNT_UNIT = 1000000000 wei;
    uint256 private constant SIGNATURE_LENGTH = 96;
    uint256 private constant PUBKEY_LENGTH = 48;

    address public ethDepositContract;      // ETH 2.0 Deposit contract
    address public xETHAddress;             // xETH token address
    address public redeemContract;          // redeeming contract for user to pull ethers

    uint256 public managerFeeShare;         // manager's fee in 1/1000
    bytes32 public withdrawalCredentials;   // WithdrawCredential for all validator

    // credentials, pushed by owner
    ValidatorCredential [] private validatorRegistry;
    mapping(bytes32 => uint256) private pubkeyIndices; // indices of validatorRegistry by pubkey hash, starts from 1

    // next validator id
    uint256 private nextValidatorId;

    // exchange ratio related variables
    // track user deposits & redeem (xETH mint & burn)
    uint256 private totalPending;           // track pending ethers awaiting to be staked to validators
    uint256 private totalStaked;            // track current staked ethers for validators, rounded to 32 ethers
    uint256 private totalDebts;             // track current unpaid debts

    // FIFO of debts from redeemFromValidators
    mapping(uint256=>Debt) private etherDebts;
    uint256 private firstDebt;
    uint256 private lastDebt;
    mapping(address=>uint256) private userDebts;    // debts from user's perspective

    // track revenue from validators to form exchange ratio
    uint256 private accountedUserRevenue;           // accounted shared user revenue
    uint256 private accountedManagerRevenue;        // accounted manager's revenue
    uint256 private rewardDebts;                    // check validatorStopped function

    // revenue related variables
    // track beacon validator & balance
    uint256 private reportedValidators;
    uint256 private reportedValidatorBalance;

    // balance tracking
    int256 private accountedBalance;                // tracked balance change in functions,
                                                    // NOTE(x): balance might be negative for not accounting validators's redeeming

    uint256 private recentSlashed;                  // track recently slashed value
    uint256 private recentReceived;                 // track recently received (un-accounted) value into this contract
    bytes32 private vectorClock;                    // a vector clock for detecting receive() & pushBeacon() causality violations
    uint256 private vectorClockTicks;               // record current vector clock step;

    // track stopped validators
    uint256 stoppedValidators;                      // track stopped validators count

    // phase switch from 0 to 1
    uint256 private phase;

    // gas refunds
    uint256 [] private refunds;

    // PATCH VARIABLES(UPGRADES)
    uint256 private recentStopped;                  // track recent stopped validators(update: 20220927)

    /**
     * @dev empty reserved space for future adding of variables
     */
    uint256[31] private __gap;

    // KYC control
    mapping(address=>uint256) quotaUsed;
    mapping(address=>bool) whiteList;

    // auto-compounding
    bool private autoCompoundEnabled;

    // DEPRECATED(20240130): eigenlayer's restaking withdrawal credential
    bytes32 private __DEPRECATED_restakingWithdrawalCredentials;
    address private __DEPRECATED_restakingAddress;

    // UPDATE(20240130): use variable instead of constant, require upgradeAndCall to set it's value
    address public restakingContract;

    /** 
     * ======================================================================================
     * 
     * SYSTEM SETTINGS, OPERATED VIA OWNER(DAO/TIMELOCK)
     * 
     * ======================================================================================
     */
    receive() external payable { }
    constructor() { _disableInitializers(); }

    /**
     * @dev only phase
     */
    modifier onlyPhase(uint256 requiredPhase) {
        _require(phase >= requiredPhase, "SYS001");
        _;
    }

    /**
     * @dev pause the contract
     */
    function pause() public onlyRole(PAUSER_ROLE) {
        _pause();
    }

    /**
     * @dev unpause the contract
     */
    function unpause() public onlyRole(PAUSER_ROLE) {
        _unpause();
    }

    /**
     * @dev initialization address
     */
    /*
    function initialize() initializer public {
        __Pausable_init();
        __AccessControl_init();
        __ReentrancyGuard_init();

        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(ORACLE_ROLE, msg.sender);
        _grantRole(REGISTRY_ROLE, msg.sender);
        _grantRole(PAUSER_ROLE, msg.sender);
        _grantRole(MANAGER_ROLE, msg.sender);

        // init default values
        managerFeeShare = 5;
        firstDebt = 1;
        lastDebt = 0;
        phase = 0;
        _vectorClockTick();

        // initiate default withdrawal credential to the contract itself
        // uint8('0x1') + 11 bytes(0) + this.address
        bytes memory cred = abi.encodePacked(bytes1(0x01), new bytes(11), address(this));
        withdrawalCredentials = BytesLib.toBytes32(cred, 0);
    }
   */
   
    /**
     * UPDATE(20240130): to set a variable after upgrades
     * use upgradeAndCall to initializeV2
     */ 
    /*
    function initializeV2(address restakingContract_) reinitializer(2) public {
        restakingContract = restakingContract_;
    }
    */

    /**
     * @dev phase switch
     */
    function switchPhase(uint256 newPhase) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require (newPhase >= phase, "SYS002");
        phase = newPhase;
    }

    /**
     * @dev register a validator
     */
    function registerValidator(bytes calldata pubkey, bytes calldata signature) external onlyRole(REGISTRY_ROLE) {
        _require(signature.length == SIGNATURE_LENGTH, "SYS003");
        _require(pubkey.length == PUBKEY_LENGTH, "SYS004");

        bytes32 pubkeyHash = keccak256(pubkey);
        _require(pubkeyIndices[pubkeyHash] == 0, "SYS005");
        validatorRegistry.push(ValidatorCredential({pubkey:pubkey, signature:signature, stopped:false, restaking: false}));
        pubkeyIndices[pubkeyHash] = validatorRegistry.length;
    }

    /**
     * @dev replace a validator in case of msitakes
     */
    function replaceValidator(bytes calldata oldpubkey, bytes calldata pubkey, bytes calldata signature) external onlyRole(REGISTRY_ROLE) {
        _require(pubkey.length == PUBKEY_LENGTH, "SYS004");
        _require(signature.length == SIGNATURE_LENGTH, "SYS003");

        // mark old pub key to false
        bytes32 oldPubKeyHash = keccak256(oldpubkey);
        _require(pubkeyIndices[oldPubKeyHash] > 0, "SYS006");
        uint256 index = pubkeyIndices[oldPubKeyHash] - 1;
        delete pubkeyIndices[oldPubKeyHash];

        // set new pubkey
        bytes32 pubkeyHash = keccak256(pubkey);
        validatorRegistry[index] = ValidatorCredential({pubkey:pubkey, signature:signature, stopped:false, restaking: false});
        pubkeyIndices[pubkeyHash] = index+1;
    }

    /**
     * @dev replace validators in batch
     */
    function replaceValidators(bytes [] calldata oldpubkeys, bytes [] calldata pubkeys, bytes [] calldata signatures, bool restaking) external onlyRole(REGISTRY_ROLE) {
        _require(pubkeys.length == signatures.length, "SYS007");
        _require(oldpubkeys.length == pubkeys.length, "SYS007");
        uint256 n = pubkeys.length;

        for(uint256 i=0;i<n;i++) {
            bytes calldata oldpubkey = oldpubkeys[i];
            bytes calldata pubkey = pubkeys[i];
            bytes calldata signature = signatures[i];

            _require(oldpubkey.length == PUBKEY_LENGTH, "SYS004");
            _require(pubkey.length == PUBKEY_LENGTH, "SYS004");
            _require(signature.length == SIGNATURE_LENGTH, "SYS003");

            // mark old pub key to false
            bytes32 oldPubKeyHash = keccak256(oldpubkey);
            _require(pubkeyIndices[oldPubKeyHash] > 0, "SYS006");
            uint256 index = pubkeyIndices[oldPubKeyHash] - 1;
            delete pubkeyIndices[oldPubKeyHash];

            // set new pubkey
            bytes32 pubkeyHash = keccak256(pubkey);
            ValidatorCredential storage validator = validatorRegistry[index];
            validator.pubkey = pubkey;
            validator.signature = signature;
            validator.restaking = restaking;
            pubkeyIndices[pubkeyHash] = index+1;
        }
    }

    /**
     * @dev register a batch of validators
     */
    function registerValidators(bytes [] calldata pubkeys, bytes [] calldata signatures) external onlyRole(REGISTRY_ROLE) {
        _require(pubkeys.length == signatures.length, "SYS007");
        uint256 n = pubkeys.length;
        for(uint256 i=0;i<n;i++) {
            _require(pubkeys[i].length == PUBKEY_LENGTH, "SYS004");
            _require(signatures[i].length == SIGNATURE_LENGTH, "SYS003");

            bytes32 pubkeyHash = keccak256(pubkeys[i]);
            _require(pubkeyIndices[pubkeyHash] == 0, "SYS005");
            validatorRegistry.push(ValidatorCredential({pubkey:pubkeys[i], signature:signatures[i], stopped:false, restaking: false}));
            pubkeyIndices[pubkeyHash] = validatorRegistry.length;
        }
    }

    /**
     * @dev register a batch of LRT validators
     * UPDATE(20240115): register a batch of validators for Liquid Restaking (EigenLayer)
     */
    function registerRestakingValidators(bytes [] calldata pubkeys, bytes [] calldata signatures) external onlyRole(REGISTRY_ROLE) {
        _require(pubkeys.length == signatures.length, "SYS007");
        uint256 n = pubkeys.length;
        for(uint256 i=0;i<n;i++) {
            _require(pubkeys[i].length == PUBKEY_LENGTH, "SYS004");
            _require(signatures[i].length == SIGNATURE_LENGTH, "SYS003");

            bytes32 pubkeyHash = keccak256(pubkeys[i]);
            _require(pubkeyIndices[pubkeyHash] == 0, "SYS005");
            validatorRegistry.push(ValidatorCredential({pubkey:pubkeys[i], signature:signatures[i], stopped:false, restaking: true}));
            pubkeyIndices[pubkeyHash] = validatorRegistry.length;
        }
    }

    /**
     * @dev toggleWhiteList
     */
    function toggleWhiteList(address account) external onlyRole(DEFAULT_ADMIN_ROLE) {
        whiteList[account] = !whiteList[account];

        emit WhiteListToggle(account, whiteList[account]);
    }

    /**
     * @dev toggle autocompound
     */
    function toggleAutoCompound() external onlyRole(DEFAULT_ADMIN_ROLE) {
        autoCompoundEnabled = !autoCompoundEnabled;

        emit AutoCompoundToggle(autoCompoundEnabled);
    }

    /**
     * @dev set manager's fee in 1/1000
     */
    function setManagerFeeShare(uint256 milli) external onlyRole(DEFAULT_ADMIN_ROLE)  {
        _require(milli >=0 && milli <=1000, "SYS008");
        managerFeeShare = milli;

        emit ManagerFeeSet(milli);
    }

    /**
     * @dev set xETH token contract address
     */
    function setXETHContractAddress(address _xETHContract) external onlyRole(DEFAULT_ADMIN_ROLE) {
        xETHAddress = _xETHContract;

        emit XETHContractSet(_xETHContract);
    }

    /**
     * @dev set eth deposit contract address
     */
    function setETHDepositContract(address _ethDepositContract) external onlyRole(DEFAULT_ADMIN_ROLE) {
        ethDepositContract = _ethDepositContract;

        emit DepositContractSet(_ethDepositContract);
    }

    /**
     * @dev set redeem contract
     */
    function setRedeemContract(address _redeemContract) external onlyRole(DEFAULT_ADMIN_ROLE) {
        redeemContract = _redeemContract;

        emit RedeemContractSet(_redeemContract);
    }

    /**
     * @dev set withdraw credential to receive revenue, usually this should be the contract itself.
     */
    function setWithdrawCredential(bytes32 withdrawalCredentials_) external onlyRole(DEFAULT_ADMIN_ROLE) {
        withdrawalCredentials = withdrawalCredentials_;
        emit WithdrawCredentialSet(withdrawalCredentials);
    } 

    
    /**
     * @dev stake into eth2 staking contract by calling this function
     */
    function stake() external { _stakeInternal(); }

    /**
     * @dev internal entry of stake() external 
     */
    function _stakeInternal() internal {
        // spin max nodes
        uint256 numValidators = totalPending / DEPOSIT_SIZE;
        uint256 maxValidators = (nextValidatorId + numValidators <= validatorRegistry.length)?
                                    numValidators:
                                    validatorRegistry.length - nextValidatorId;

        for (uint256 i = 0;i<maxValidators;i++) {
            _spinup();
        }

        if (maxValidators > 0) {
            emit ValidatorActivated(nextValidatorId);
        }
    }

    /**
     * @dev manager withdraw fees as uniETH
     */
    function withdrawManagerFee(uint256 amount, address to) external nonReentrant onlyRole(MANAGER_ROLE)  {
        _syncBalance();
        
        _require(amount <= accountedManagerRevenue, "SYS010");
        // debts + userRevenue + managersRevenue + pending ethers
        _require(address(this).balance >= amount + totalPending + totalDebts, "SYS011");

        // mint uniETH while keeping the exchange ratio invariant
        uint256 totalXETH = IERC20(xETHAddress).totalSupply();
        uint256 totalEthers = currentReserve();
        uint256 toMint = 1 * amount;  // default exchange ratio 1:1

        if (totalEthers > 0) { // avert division overflow
            toMint = totalXETH * amount / totalEthers;
        }

        // NOTE: the following procdure must keep exchangeRatio invariant:
        // mint equivalent `uniETH` to `amount`
        IMintableContract(xETHAddress).mint(to, toMint);

        // track balance change:
        // shift manager's revenue from accountedManagerRevenue to totalPending
        totalPending += amount;
        accountedManagerRevenue -= amount;

        emit ManagerFeeWithdrawed(amount, to);
    }

    /**
     * @dev balance sync, also moves the vector clock if it has different value
     */
    function syncBalance() external onlyRole(ORACLE_ROLE) { _syncBalance(); }
    
    /**
     * @dev balance sync, also moves the vector clock if it has different value
     */
    function _syncBalance() internal {
        assert(int256(address(this).balance) >= accountedBalance);
        uint256 diff = uint256(int256(address(this).balance) - accountedBalance);
        if (diff > 0) {
            accountedBalance = int256(address(this).balance);
            recentReceived += diff;
            _vectorClockTick();
            emit BalanceSynced(diff);
        }
    }
    
    /**
     * @dev operator reports current alive validators count and overall balance
     * with default appreciation limit
     */
    function pushBeacon(uint256 _aliveValidators, uint256, bytes32 clock) external onlyRole(ORACLE_ROLE) {
        uint256 limit = 1000 * 32 ether/currentReserve() ;
        _pushBeacon(_aliveValidators, clock, limit);

        // try to initiate restaking operations
        IRockXRestaking(restakingContract).withdrawBeforeRestaking();
        IRockXRestaking(restakingContract).claimDelayedWithdrawals(type(uint256).max);
    }

    /**
     * @dev operator reports current alive validators count and overall balance
     * with custom appreciation limit
     */
    function pushBeacon(uint256 _aliveValidators, uint256, bytes32 clock, uint256 limit) external onlyRole(ORACLE_ROLE) {
        _pushBeacon(_aliveValidators, clock, limit);

        // try to initiate restaking operations
        IRockXRestaking(restakingContract).withdrawBeforeRestaking();
        IRockXRestaking(restakingContract).claimDelayedWithdrawals(type(uint256).max);
    }


    function _pushBeacon(uint256 _aliveValidators, bytes32 clock, uint256 limit) internal {
        _require(vectorClock == clock, "SYS012");
        _require(_aliveValidators + stoppedValidators <= nextValidatorId, "SYS013");

        // step 0. collect new revenue if there is any.
        _syncBalance();
        
        // Check recentStopped and recentReceived to see they match,
        // this works until we can earn 32ETH per day
        if (totalDebts > 0) {
            _require(recentReceived/DEPOSIT_SIZE == recentStopped, "SYS030");
        }

        // step 1. check if new validator increased
        // and adjust rewardBase to include the new validators' value
        uint256 rewardBase = reportedValidatorBalance;
        if (_aliveValidators + recentStopped > reportedValidators) {
            // newly launched validators
            uint256 newValidators = _aliveValidators + recentStopped - reportedValidators;
            rewardBase += newValidators * DEPOSIT_SIZE;
        }

        // step 2. calc rewards, this also considers recentReceived ethers from 
        // either stopped validators or withdrawed ethers as rewards.
        //
        // During two consecutive pushBeacon operation, the ethers will ONLY: 
        //  1. staked to new validators
        //  2. move from active validators to this contract
        //  3. slashed and stopped then the remaining ethers returned to this contract
        // 
        // so, at any time, revenue generated if:
        //
        //  current active validator balance 
        //      + recent received from validators(since last pushBeacon) 
        //      + recent slashed(since last pushBeacon)
        //  >（GREATER THAN) reward base(last active validator balance + new nodes balance)
        //
        // NOTE(x): recentSlashed is accounted here, then we can adjust the basepoint to current alive validator balance.
        //   eg:
        //          _aliveBalance = 0 （slashed)
        //          recentReceived = 16 ETH (the ethers left)
        //          recentSlashed = 16 ETH (assumed slashed ethers)
        // 
        uint256 _aliveBalance = _aliveValidators * DEPOSIT_SIZE;  // computed balance
        _require(_aliveBalance + recentReceived + recentSlashed >= rewardBase, "SYS015");
        uint256 rewards = _aliveBalance + recentReceived + recentSlashed - rewardBase;
        if (totalDebts > 0) {
            // as we cannot differentiate the ethers from full withdrawal & partial withdrawal,
            // to make sure we only take partial withdrawal(revenue) into reward calculation
            _require(rewards * 1000 / currentReserve() < limit, "SYS016");
        }

        _distributeRewards(rewards);
        _autocompound();

        // step 3. update reportedValidators & reportedValidatorBalance
        // reset the recentReceived to 0
        reportedValidatorBalance = _aliveBalance; 
        reportedValidators = _aliveValidators;
        recentReceived = 0;
        recentSlashed = 0;
        recentStopped = 0;
    }

    /**
     * @dev emergentFixRecentReceived
     */
    function emergentFixRecentReceived(uint256 diff) external onlyRole(DEFAULT_ADMIN_ROLE) {
        recentReceived += diff;
    }
    /**
     * @dev notify some validators stopped, and pay the debts
     */
    function validatorStopped(bytes [] calldata _stoppedPubKeys, bytes32 clock) external nonReentrant onlyRole(ORACLE_ROLE) {
        _require(vectorClock == clock, "SYS012");
        uint256 amountUnstaked = _stoppedPubKeys.length * DEPOSIT_SIZE;
        _require(_stoppedPubKeys.length > 0, "SYS017");
        _require(_stoppedPubKeys.length + stoppedValidators <= nextValidatorId, "SYS018");
        _require(address(this).balance >= amountUnstaked + totalPending + accountedManagerRevenue, "SYS019");

        // track stopped validators
        for (uint i=0;i<_stoppedPubKeys.length;i++) {
            bytes32 pubkeyHash = keccak256(_stoppedPubKeys[i]);
            _require(pubkeyIndices[pubkeyHash] > 0, "SYS006");
            uint256 index = pubkeyIndices[pubkeyHash] - 1;
            _require(!validatorRegistry[index].stopped, "SYS020");
            validatorRegistry[index].stopped = true;
        }
        stoppedValidators += _stoppedPubKeys.length;
        recentStopped += _stoppedPubKeys.length;

        // NOTE(x) The following procedure MUST keep currentReserve unchanged:
        // ASSUMING: paid == amountUnstaked
        // 
        // totalPending + (totalStaked - amountUnstaked) + accountedUserRevenue - rewardDebt - (totalDebts - paid)
        //  ==
        //  totalPending + totalStaked + accountedUserRevenue - totalDebts - rewardDebt
        //

        // pay debts
        uint256 paid = _payDebts(amountUnstaked);
        _require(paid == amountUnstaked, "SYS021");
        // track total staked ethers
        totalStaked -= amountUnstaked;
        
        // log
        emit ValidatorStopped(_stoppedPubKeys.length);

        // vector clock moves
        _vectorClockTick();
    }

    /**
     * @dev notify some validators has been slashed, turn off those stopped validator
     */
    function validatorSlashedStop(bytes [] calldata _stoppedPubKeys, bytes32 clock) external nonReentrant onlyRole(ORACLE_ROLE) {
        _require(vectorClock == clock, "SYS012");
        uint256 amountUnstaked = _stoppedPubKeys.length * DEPOSIT_SIZE;
        _require(_stoppedPubKeys.length > 0, "SYS017");
        _require(address(this).balance >= _stoppedPubKeys.length * 16 ether + totalPending + accountedManagerRevenue, "SYS019");

        // record slashed validators.
        for (uint i=0;i<_stoppedPubKeys.length;i++) {
            bytes32 pubkeyHash = keccak256(_stoppedPubKeys[i]);
            _require(pubkeyIndices[pubkeyHash] > 0, "SYS006");
            uint256 index = pubkeyIndices[pubkeyHash] - 1;
            _require(!validatorRegistry[index].stopped, "SYS020");
            validatorRegistry[index].stopped = true;
        }
        stoppedValidators += _stoppedPubKeys.length;
        recentStopped += _stoppedPubKeys.length;

        // currentReserve changed to:
        // (totalPending + 16 ETH) + (totalStaked - amountUnstaked) + accountedUserRevenue - rewardDebt - totalDebts
        //  the remaining part(revenue) will be taken as the accruing rewards of existing holders.
        totalStaked -= amountUnstaked;
        totalPending += _stoppedPubKeys.length * 16 ether;
        // track recent slashed
        recentSlashed += _stoppedPubKeys.length * 16 ether;

        // log
        emit ValidatorSlashedStopped(_stoppedPubKeys.length);
        
        // vector clock moves
        _vectorClockTick();
    }

    /**
     * ======================================================================================
     * 
     * VIEW FUNCTIONS
     * 
     * ======================================================================================
     */

    /**
     * @dev returns current reserve of ethers
     */
    function currentReserve() public view returns(uint256) {
        return totalPending + totalStaked + accountedUserRevenue - totalDebts - rewardDebts;
    }

    /*
     * @dev returns current vector clock
     */
    function getVectorClock() external view returns(bytes32) { return vectorClock; }

    /*
     * @dev returns current accounted balance
     */
    function getAccountedBalance() external view returns(int256) { return accountedBalance; }

    /**
     * @dev return total staked ethers
     */
    function getTotalStaked() external view returns (uint256) { return totalStaked; }

    /**
     * @dev return pending ethers
     */
    function getPendingEthers() external view returns (uint256) { return totalPending; }

    /**
     * @dev return reward debts
     */
    function getRewardDebts() external view returns (uint256) { return rewardDebts; }

    /**
     * @dev return current debts
     */
    function getCurrentDebts() external view returns (uint256) { return totalDebts; }

    /**
     * @dev returns the accounted user revenue
     */
    function getAccountedUserRevenue() external view returns (uint256) { return accountedUserRevenue; }

    /**
     * @dev returns the accounted manager's revenue
     */
    function getAccountedManagerRevenue() external view returns (uint256) { return accountedManagerRevenue; }

    /*
     * @dev returns accumulated beacon validators
     */
    function getReportedValidators() external view returns (uint256) { return reportedValidators; }

    /*
     * @dev returns reported validator balance snapshot
     */
    function getReportedValidatorBalance() external view returns (uint256) { return reportedValidatorBalance; }

    /*
     * @dev returns recent slashed value
     */
    function getRecentSlashed() external view returns (uint256) { return recentSlashed; }
    /*
     * @dev returns recent received value
     */
    function getRecentReceived() external view returns (uint256) { return recentReceived; }
    /*
     * @dev returns recent received value
     */
    function getRecentStopped() external view returns (uint256) { return recentStopped; }

    /**
     * @dev return debt for an account
     */
    function debtOf(address account) external view returns (uint256) {
        return userDebts[account];
    }

    /**
     * @dev return number of registered validator
     */
    function getRegisteredValidatorsCount() external view returns (uint256) {
        return validatorRegistry.length;
    }
    
    /**
     * @dev return a batch of validators credential
     */
    function getRegisteredValidators(uint256 idx_from, uint256 idx_to) external view returns (bytes [] memory pubkeys, bytes [] memory signatures, bool[] memory stopped) {
        pubkeys = new bytes[](idx_to - idx_from);
        signatures = new bytes[](idx_to - idx_from);
        stopped = new bool[](idx_to - idx_from);


        uint counter = 0;
        for (uint i = idx_from; i < idx_to;i++) {
            pubkeys[counter] = validatorRegistry[i].pubkey;
            signatures[counter] = validatorRegistry[i].signature;
            stopped[counter] = validatorRegistry[i].stopped;
            counter++;
        }
    }

    /**
     * @dev return a batch of validators information
     * UPDATE(20240119): V2 returns restaking info
     */
    function getRegisteredValidatorsV2(uint256 idx_from, uint256 idx_to) external view returns (
         bytes [] memory pubkeys,
         bytes [] memory signatures,
         bool [] memory stopped,
         bool [] memory restaking)
    {
        pubkeys = new bytes[](idx_to - idx_from);
        signatures = new bytes[](idx_to - idx_from);
        stopped = new bool[](idx_to - idx_from);
        restaking = new bool[](idx_to - idx_from);

        uint counter = 0;
        for (uint i = idx_from; i < idx_to;i++) {
            pubkeys[counter] = validatorRegistry[i].pubkey;
            signatures[counter] = validatorRegistry[i].signature;
            stopped[counter] = validatorRegistry[i].stopped;
            restaking[counter] = validatorRegistry[i].restaking;
            counter++;
        }
    }


    /**
     * @dev return next validator id
     */
    function getNextValidatorId() external view returns (uint256) { return nextValidatorId; }

    /**
     * @dev return exchange ratio of , multiplied by 1e18
     */
    function exchangeRatio() external view returns (uint256) {
        uint256 xETHAmount = IERC20(xETHAddress).totalSupply();
        if (xETHAmount == 0) {
            return 1 * MULTIPLIER;
        }

        uint256 ratio = currentReserve() * MULTIPLIER / xETHAmount;
        return ratio;
    }

    /**
     * @dev return debt of index
     */
    function checkDebt(uint256 index) external view returns (address account, uint256 amount) {
        Debt memory debt = etherDebts[index];
        return (debt.account, debt.amount);
    }
    /**
     * @dev return debt queue index
     */
    function getDebtQueue() external view returns (uint256 first, uint256 last) {
        return (firstDebt, lastDebt);
    }

    /**
     * @dev get stopped validators count
     */
    function getStoppedValidatorsCount() external view returns (uint256) { return stoppedValidators; }

    /**
     * @dev get used quota
     */
    function getQuota(address account) external view returns (uint256) { return quotaUsed[account]; }

    /**
     * @dev check whitelist enabled
     */
    function isWhiteListed(address account) external view returns (bool) { return whiteList[account]; }


    /**
     * ======================================================================================
     * 
     * EXTERNAL FUNCTIONS
     * 
     * ======================================================================================
     */
    /**
     * @dev mint xETH with ETH
     */
    function mint(uint256 minToMint, uint256 deadline) external payable nonReentrant whenNotPaused returns(uint256 minted){
        _require(block.timestamp < deadline, "USR001");
        _require(msg.value > 0, "USR002");

        // for non KYC users, check the quota
        if (!whiteList[msg.sender]) {
            _require(quotaUsed[msg.sender] + msg.value <= 50000 ether, "USR003");
            quotaUsed[msg.sender] += msg.value;
        }
        
        // track balance
        _balanceIncrease(msg.value);

        // mint xETH while keeping the exchange ratio invariant
        uint256 totalXETH = IERC20(xETHAddress).totalSupply();
        uint256 totalEthers = currentReserve();
        uint256 toMint = 1 * msg.value;  // default exchange ratio 1:1

        if (totalEthers > 0) { // avert division overflow
            toMint = totalXETH * msg.value / totalEthers;
        }

        // mint xETH
        _require(toMint >= minToMint, "USR004");
        IMintableContract(xETHAddress).mint(msg.sender, toMint);
        totalPending += msg.value;

        // try to initiate stake()
        _stakeInternal();

        // try to initiate restaking operations
        IRockXRestaking(restakingContract).withdrawBeforeRestaking();
        IRockXRestaking(restakingContract).claimDelayedWithdrawals(type(uint256).max);

        return toMint;
    }

    /**
     * @dev redeem N * 32Ethers, which will turn off validadators,
     * note this function is asynchronous, the caller will only receive his ethers
     * after the validator has turned off.
     *
     * this function is dedicated for institutional operations.
     * 
     * redeem keeps the ratio invariant
     */
    function redeemFromValidators(uint256 ethersToRedeem, uint256 maxToBurn, uint256 deadline) external nonReentrant onlyPhase(1) returns(uint256 burned) {
        _require(block.timestamp < deadline, "USR001");
        _require(ethersToRedeem % DEPOSIT_SIZE == 0, "USR005");
        _require(ethersToRedeem > 0, "USR005");

        uint256 totalXETH = IERC20(xETHAddress).totalSupply();
        uint256 xETHToBurn = totalXETH * ethersToRedeem / currentReserve();
        _require(xETHToBurn <= maxToBurn, "USR004");

        // NOTE: the following procdure must keep exchangeRatio invariant:
        // transfer xETH from sender & burn
        IERC20(xETHAddress).safeTransferFrom(msg.sender, address(this), xETHToBurn);
        IMintableContract(xETHAddress).burn(xETHToBurn);

        // queue ether debts
        _enqueueDebt(msg.sender, ethersToRedeem);

        // try to initiate restaking operations
        IRockXRestaking(restakingContract).withdrawBeforeRestaking();
        IRockXRestaking(restakingContract).claimDelayedWithdrawals(type(uint256).max);

        // return burned 
        return xETHToBurn;
    }

    /** 
     * ======================================================================================
     * 
     * INTERNAL FUNCTIONS
     * 
     * ======================================================================================
     */

    function _balanceIncrease(uint256 amount) internal { accountedBalance += int256(amount); }
    function _balanceDecrease(uint256 amount) internal { accountedBalance -= int256(amount); }

    function _vectorClockTick() internal {
        vectorClockTicks++;
        vectorClock = keccak256(abi.encodePacked(vectorClock, block.timestamp, vectorClockTicks));
    }

    function _enqueueDebt(address account, uint256 amount) internal {
        // debt is paid in FIFO queue
        lastDebt += 1;
        etherDebts[lastDebt] = Debt({account:account, amount:amount});

        // track user debts
        userDebts[account] += amount;
        // track total debts
        totalDebts += amount;

        // log
        emit DebtQueued(account, amount);
    }

    function _dequeueDebt() internal returns (Debt memory debt) {
        _require(lastDebt >= firstDebt, "SYS022");  // non-empty queue
        debt = etherDebts[firstDebt];
        delete etherDebts[firstDebt];
        firstDebt += 1;
    }

    /**
     * @dev pay debts for a given amount
     */
    function _payDebts(uint256 total) internal returns(uint256 amountPaid) {
        _require(address(redeemContract) != address(0x0), "SYS023");

        // ethers to pay
        for (uint i=firstDebt;i<=lastDebt;i++) {
            if (total == 0) {
                break;
            }

            Debt storage debt = etherDebts[i];

            // clean debts
            uint256 toPay = debt.amount <= total? debt.amount:total;
            debt.amount -= toPay;
            total -= toPay;
            userDebts[debt.account] -= toPay;
            amountPaid += toPay;

            // transfer money to debt contract
            IRockXRedeem(redeemContract).pay{value:toPay}(debt.account);

            // dequeue if cleared 
            if (debt.amount == 0) {
                _dequeueDebt();
            }
        }
        
        totalDebts -= amountPaid;
        
        // track balance
        _balanceDecrease(amountPaid);
    }

    /**
     * @dev distribute revenue
     */
    function _distributeRewards(uint256 rewards) internal {
        // rewards distribution
        uint256 fee = rewards * managerFeeShare / 1000;
        accountedManagerRevenue += fee;
        accountedUserRevenue += rewards - fee;

        emit RevenueAccounted(rewards);
    }

    /**
     * @dev auto compounding, after shanghai merge, called in pushBeacon
     */
    function _autocompound() internal {
        if (autoCompoundEnabled) {
            // contract balance consists of maximum:
            // validator assets to clear debts, rewards after shanghai merge(compound), user's pending ethers to mint and manager's revenue.
            // autocompound & payDebts will race to use the incoming ethers, but eventually both will succeed.
            if (address(this).balance > accountedManagerRevenue + totalPending) {
                uint256 maxCompound = accountedUserRevenue - rewardDebts;
                uint256 maxUsable = address(this).balance - accountedManagerRevenue - totalPending;
                uint256 effectiveEthers = maxCompound < maxUsable? maxCompound:maxUsable;
                totalPending += effectiveEthers;
                rewardDebts += effectiveEthers;
            }
        }
    }

    /**
     * @dev spin up the node
     */
    function _spinup() internal {
         // load credential
        ValidatorCredential memory cred = validatorRegistry[nextValidatorId];
        
        // UPDATE(20240115):
        //  switch withdrawal credential based on it's registration
        if (!cred.restaking) {
            _stake(cred.pubkey, cred.signature, withdrawalCredentials);
        } else {
            address eigenPod = IRockXRestaking(restakingContract).eigenPod();
            bytes memory eigenPodCred = abi.encodePacked(bytes1(0x01), new bytes(11), eigenPod);
            bytes32 restakingWithdrawalCredentials = BytesLib.toBytes32(eigenPodCred, 0);

            _stake(cred.pubkey, cred.signature, restakingWithdrawalCredentials);
        }
        nextValidatorId++;        

        // track total staked & total pending ethers
        totalStaked += DEPOSIT_SIZE;
        totalPending -= DEPOSIT_SIZE;
    }

    /**
     * @dev Invokes a deposit call to the official Deposit contract
     *      UPDATE(20240115): add param withCred, instead of using contract variable
     */
    function _stake(bytes memory pubkey, bytes memory signature, bytes32 withCred) internal {
        _require(withCred != bytes32(0x0), "SYS024");
        uint256 value = DEPOSIT_SIZE;
        uint256 depositAmount = DEPOSIT_SIZE / DEPOSIT_AMOUNT_UNIT;
        assert(depositAmount * DEPOSIT_AMOUNT_UNIT == value);    // properly rounded

        // Compute deposit data root (`DepositData` hash tree root)
        // https://etherscan.io/address/0x00000000219ab540356cbb839cbe05303d7705fa#code
        bytes32 pubkey_root = sha256(abi.encodePacked(pubkey, bytes16(0)));
        bytes32 signature_root = sha256(abi.encodePacked(
            sha256(BytesLib.slice(signature, 0, 64)),
            sha256(abi.encodePacked(BytesLib.slice(signature, 64, SIGNATURE_LENGTH - 64), bytes32(0)))
        ));
        
        bytes memory amount = to_little_endian_64(uint64(depositAmount));

        bytes32 depositDataRoot = sha256(abi.encodePacked(
            sha256(abi.encodePacked(pubkey_root, withCred)),
            sha256(abi.encodePacked(amount, bytes24(0), signature_root))
        ));

        IDepositContract(ethDepositContract).deposit{value:DEPOSIT_SIZE} (
            pubkey, abi.encodePacked(withCred), signature, depositDataRoot);

        // track balance
        _balanceDecrease(DEPOSIT_SIZE);
    }

    /**
     * @dev to little endian
     * https://etherscan.io/address/0x00000000219ab540356cbb839cbe05303d7705fa#code
     */
    function to_little_endian_64(uint64 value) internal pure returns (bytes memory ret) {
        ret = new bytes(8);
        bytes8 bytesValue = bytes8(value);
        // Byteswapping during copying to bytes.
        ret[0] = bytesValue[7];
        ret[1] = bytesValue[6];
        ret[2] = bytesValue[5];
        ret[3] = bytesValue[4];
        ret[4] = bytesValue[3];
        ret[5] = bytesValue[2];
        ret[6] = bytesValue[1];
        ret[7] = bytesValue[0];
    }

    /**
     * @dev function version of _require, which could make the code size smaller
     */
    function _require(bool condition, string memory text) private pure {
        require(condition, text);
    }

    /**
     * ======================================================================================
     * 
     * ROCKX SYSTEM EVENTS
     *
     * ======================================================================================
     */
    event ValidatorActivated(uint256 nextValidatorId);
    event ValidatorStopped(uint256 stoppedCount);
    event RevenueAccounted(uint256 amount);
    event ValidatorSlashedStopped(uint256 stoppedCount);
    event ManagerAccountSet(address account);
    event ManagerFeeSet(uint256 milli);
    event ManagerFeeWithdrawed(uint256 amount, address);
    event WithdrawCredentialSet(bytes32 withdrawCredential);
    event RestakingAddressSet(address addr);
    event DebtQueued(address creditor, uint256 amountEther);
    event XETHContractSet(address addr);
    event DepositContractSet(address addr);
    event RedeemContractSet(address addr);
    event BalanceSynced(uint256 diff);
    event WhiteListToggle(address account, bool enabled);
    event AutoCompoundToggle(bool enabled);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "IERC20.sol";

interface IMintableContract is IERC20 {
    function mint(address account, uint256 amount) external;
    function burn(uint256 amount) external;
}

// This interface is designed to be compatible with the Vyper version.
/// @notice This is the Ethereum 2.0 deposit contract interface.
/// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs
interface IDepositContract {
    /// @notice A processed deposit event.
    event DepositEvent(
        bytes pubkey,
        bytes withdrawal_credentials,
        bytes amount,
        bytes signature,
        bytes index
    );

    /// @notice Submit a Phase 0 DepositData object.
    /// @param pubkey A BLS12-381 public key.
    /// @param withdrawal_credentials Commitment to a public key for withdrawals.
    /// @param signature A BLS12-381 signature.
    /// @param deposit_data_root The SHA-256 hash of the SSZ-encoded DepositData object.
    /// Used as a protection against malformed input.
    function deposit(
        bytes calldata pubkey,
        bytes calldata withdrawal_credentials,
        bytes calldata signature,
        bytes32 deposit_data_root
    ) external payable;

    /// @notice Query the current deposit root hash.
    /// @return The deposit root hash.
    function get_deposit_root() external view returns (bytes32);

    /// @notice Query the current deposit count.
    /// @return The deposit count encoded as a little endian 64-bit number.
    function get_deposit_count() external view returns (bytes memory);
}

interface IRockXRedeem {
    function pay(address account) external payable;
}

interface IRockXRestaking {
    function getPendingWithdrawalAmount() external view returns (uint256);
    function withdrawBeforeRestaking() external;
    function claimDelayedWithdrawals(uint256 maxNumberOfWithdrawalsToClaim) external;
    function eigenPod() external view returns (address);
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: Unlicense
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 *
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 */
pragma solidity >=0.8.0 <0.9.0;


library BytesLib {
    function concat(
        bytes memory _preBytes,
        bytes memory _postBytes
    )
        internal
        pure
        returns (bytes memory)
    {
        bytes memory tempBytes;

        assembly {
            // Get a location of some free memory and store it in tempBytes as
            // Solidity does for memory variables.
            tempBytes := mload(0x40)

            // Store the length of the first bytes array at the beginning of
            // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)

            // Maintain a memory counter for the current write location in the
            // temp bytes array by adding the 32 bytes for the array length to
            // the starting location.
            let mc := add(tempBytes, 0x20)
            // Stop copying when the memory counter reaches the length of the
            // first bytes array.
            let end := add(mc, length)

            for {
                // Initialize a copy counter to the start of the _preBytes data,
                // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
                // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                // Write the _preBytes data into the tempBytes memory 32 bytes
                // at a time.
                mstore(mc, mload(cc))
            }

            // Add the length of _postBytes to the current length of tempBytes
            // and store it as the new length in the first 32 bytes of the
            // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))

            // Move the memory counter back from a multiple of 0x20 to the
            // actual end of the _preBytes data.
            mc := end
            // Stop copying when the memory counter reaches the new combined
            // length of the arrays.
            end := add(mc, length)

            for {
                let cc := add(_postBytes, 0x20)
            } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                mstore(mc, mload(cc))
            }

            // Update the free-memory pointer by padding our last write location
            // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
            // next 32 byte block, then round down to the nearest multiple of
            // 32. If the sum of the length of the two arrays is zero then add
            // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(0x40, and(
              add(add(end, iszero(add(length, mload(_preBytes)))), 31),
              not(31) // Round down to the nearest 32 bytes.
            ))
        }

        return tempBytes;
    }

    function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {
        assembly {
            // Read the first 32 bytes of _preBytes storage, which is the length
            // of the array. (We don't need to use the offset into the slot
            // because arrays use the entire slot.)
            let fslot := sload(_preBytes.slot)
            // Arrays of 31 bytes or less have an even value in their slot,
            // while longer arrays have an odd value. The actual length is
            // the slot divided by two for odd values, and the lowest order
            // byte divided by two for even values.
            // If the slot is even, bitwise and the slot with 255 and divide by
            // two to get the length. If the slot is odd, bitwise and the slot
            // with -1 and divide by two.
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)
            let newlength := add(slength, mlength)
            // slength can contain both the length and contents of the array
            // if length < 32 bytes so let's prepare for that
            // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
            switch add(lt(slength, 32), lt(newlength, 32))
            case 2 {
                // Since the new array still fits in the slot, we just need to
                // update the contents of the slot.
                // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length
                sstore(
                    _preBytes.slot,
                    // all the modifications to the slot are inside this
                    // next block
                    add(
                        // we can just add to the slot contents because the
                        // bytes we want to change are the LSBs
                        fslot,
                        add(
                            mul(
                                div(
                                    // load the bytes from memory
                                    mload(add(_postBytes, 0x20)),
                                    // zero all bytes to the right
                                    exp(0x100, sub(32, mlength))
                                ),
                                // and now shift left the number of bytes to
                                // leave space for the length in the slot
                                exp(0x100, sub(32, newlength))
                            ),
                            // increase length by the double of the memory
                            // bytes length
                            mul(mlength, 2)
                        )
                    )
                )
            }
            case 1 {
                // The stored value fits in the slot, but the combined value
                // will exceed it.
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

                // The contents of the _postBytes array start 32 bytes into
                // the structure. Our first read should obtain the `submod`
                // bytes that can fit into the unused space in the last word
                // of the stored array. To get this, we read 32 bytes starting
                // from `submod`, so the data we read overlaps with the array
                // contents by `submod` bytes. Masking the lowest-order
                // `submod` bytes allows us to add that value directly to the
                // stored value.

                let submod := sub(32, slength)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(
                    sc,
                    add(
                        and(
                            fslot,
                            0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00
                        ),
                        and(mload(mc), mask)
                    )
                )

                for {
                    mc := add(mc, 0x20)
                    sc := add(sc, 1)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
            default {
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                // Start copying to the last used word of the stored array.
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

                // Copy over the first `submod` bytes of the new data as in
                // case 1 above.
                let slengthmod := mod(slength, 32)
                let mlengthmod := mod(mlength, 32)
                let submod := sub(32, slengthmod)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(sc, add(sload(sc), and(mload(mc), mask)))

                for {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
        }
    }

    function slice(
        bytes memory _bytes,
        uint256 _start,
        uint256 _length
    )
        internal
        pure
        returns (bytes memory)
    {
        require(_length + 31 >= _length, "slice_overflow");
        require(_bytes.length >= _start + _length, "slice_outOfBounds");

        bytes memory tempBytes;

        assembly {
            switch iszero(_length)
            case 0 {
                // Get a location of some free memory and store it in tempBytes as
                // Solidity does for memory variables.
                tempBytes := mload(0x40)

                // The first word of the slice result is potentially a partial
                // word read from the original array. To read it, we calculate
                // the length of that partial word and start copying that many
                // bytes into the array. The first word we copy will start with
                // data we don't care about, but the last `lengthmod` bytes will
                // land at the beginning of the contents of the new array. When
                // we're done copying, we overwrite the full first word with
                // the actual length of the slice.
                let lengthmod := and(_length, 31)

                // The multiplication in the next line is necessary
                // because when slicing multiples of 32 bytes (lengthmod == 0)
                // the following copy loop was copying the origin's length
                // and then ending prematurely not copying everything it should.
                let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
                let end := add(mc, _length)

                for {
                    // The multiplication in the next line has the same exact purpose
                    // as the one above.
                    let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)
                } lt(mc, end) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    mstore(mc, mload(cc))
                }

                mstore(tempBytes, _length)

                //update free-memory pointer
                //allocating the array padded to 32 bytes like the compiler does now
                mstore(0x40, and(add(mc, 31), not(31)))
            }
            //if we want a zero-length slice let's just return a zero-length array
            default {
                tempBytes := mload(0x40)
                //zero out the 32 bytes slice we are about to return
                //we need to do it because Solidity does not garbage collect
                mstore(tempBytes, 0)

                mstore(0x40, add(tempBytes, 0x20))
            }
        }

        return tempBytes;
    }

    function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) {
        require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
        address tempAddress;

        assembly {
            tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)
        }

        return tempAddress;
    }

    function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8) {
        require(_bytes.length >= _start + 1 , "toUint8_outOfBounds");
        uint8 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x1), _start))
        }

        return tempUint;
    }

    function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) {
        require(_bytes.length >= _start + 2, "toUint16_outOfBounds");
        uint16 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x2), _start))
        }

        return tempUint;
    }

    function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) {
        require(_bytes.length >= _start + 4, "toUint32_outOfBounds");
        uint32 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x4), _start))
        }

        return tempUint;
    }

    function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) {
        require(_bytes.length >= _start + 8, "toUint64_outOfBounds");
        uint64 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x8), _start))
        }

        return tempUint;
    }

    function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) {
        require(_bytes.length >= _start + 12, "toUint96_outOfBounds");
        uint96 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0xc), _start))
        }

        return tempUint;
    }

    function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) {
        require(_bytes.length >= _start + 16, "toUint128_outOfBounds");
        uint128 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x10), _start))
        }

        return tempUint;
    }

    function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
        require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
        uint256 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x20), _start))
        }

        return tempUint;
    }

    function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) {
        require(_bytes.length >= _start + 32, "toBytes32_outOfBounds");
        bytes32 tempBytes32;

        assembly {
            tempBytes32 := mload(add(add(_bytes, 0x20), _start))
        }

        return tempBytes32;
    }

    function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {
        bool success = true;

        assembly {
            let length := mload(_preBytes)

            // if lengths don't match the arrays are not equal
            switch eq(length, mload(_postBytes))
            case 1 {
                // cb is a circuit breaker in the for loop since there's
                //  no said feature for inline assembly loops
                // cb = 1 - don't breaker
                // cb = 0 - break
                let cb := 1

                let mc := add(_preBytes, 0x20)
                let end := add(mc, length)

                for {
                    let cc := add(_postBytes, 0x20)
                // the next line is the loop condition:
                // while(uint256(mc < end) + cb == 2)
                } eq(add(lt(mc, end), cb), 2) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    // if any of these checks fails then arrays are not equal
                    if iszero(eq(mload(mc), mload(cc))) {
                        // unsuccess:
                        success := 0
                        cb := 0
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }

    function equalStorage(
        bytes storage _preBytes,
        bytes memory _postBytes
    )
        internal
        view
        returns (bool)
    {
        bool success = true;

        assembly {
            // we know _preBytes_offset is 0
            let fslot := sload(_preBytes.slot)
            // Decode the length of the stored array like in concatStorage().
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)

            // if lengths don't match the arrays are not equal
            switch eq(slength, mlength)
            case 1 {
                // slength can contain both the length and contents of the array
                // if length < 32 bytes so let's prepare for that
                // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
                if iszero(iszero(slength)) {
                    switch lt(slength, 32)
                    case 1 {
                        // blank the last byte which is the length
                        fslot := mul(div(fslot, 0x100), 0x100)

                        if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {
                            // unsuccess:
                            success := 0
                        }
                    }
                    default {
                        // cb is a circuit breaker in the for loop since there's
                        //  no said feature for inline assembly loops
                        // cb = 1 - don't breaker
                        // cb = 0 - break
                        let cb := 1

                        // get the keccak hash to get the contents of the array
                        mstore(0x0, _preBytes.slot)
                        let sc := keccak256(0x0, 0x20)

                        let mc := add(_postBytes, 0x20)
                        let end := add(mc, mlength)

                        // the next line is the loop condition:
                        // while(uint256(mc < end) + cb == 2)
                        for {} eq(add(lt(mc, end), cb), 2) {
                            sc := add(sc, 1)
                            mc := add(mc, 0x20)
                        } {
                            if iszero(eq(sload(sc), mload(mc))) {
                                // unsuccess:
                                success := 0
                                cb := 0
                            }
                        }
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "IERC20.sol";
import "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");
        }
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "AddressUpgradeable.sol";

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

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

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

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = _setInitializedVersion(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.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so 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.
     *
     * 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.
     */
    modifier reinitializer(uint8 version) {
        bool isTopLevelCall = _setInitializedVersion(version);
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(version);
        }
    }

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

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        _setInitializedVersion(type(uint8).max);
    }

    function _setInitializedVersion(uint8 version) private returns (bool) {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, and for the lowest level
        // of initializers, because in other contexts the contract may have been reentered.
        if (_initializing) {
            require(
                version == 1 && !AddressUpgradeable.isContract(address(this)),
                "Initializable: contract is already initialized"
            );
            return false;
        } else {
            require(_initialized < version, "Initializable: contract is already initialized");
            _initialized = version;
            return true;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "IAccessControlUpgradeable.sol";
import "ContextUpgradeable.sol";
import "StringsUpgradeable.sol";
import "ERC165Upgradeable.sol";
import "Initializable.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

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

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

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

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

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

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

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

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

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

        _revokeRole(role, account);
    }

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;
import "Initializable.sol";

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

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

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

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

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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

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

pragma solidity ^0.8.0;

import "IERC165Upgradeable.sol";
import "Initializable.sol";

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

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

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

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

pragma solidity ^0.8.0;

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

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

pragma solidity ^0.8.0;

import "ContextUpgradeable.sol";
import "Initializable.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 PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

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

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

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

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

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

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

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

pragma solidity ^0.8.0;
import "Initializable.sol";

/**
 * @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 ReentrancyGuardUpgradeable is Initializable {
    // 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;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

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

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

• No Contract Security Audit Submitted- Submit Audit Here

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