Contract 0x64ac15AB583fFfA6a7401B83E3aA5cf4Ad1aA92A

/**
 *Submitted for verification at Etherscan.io on 2021-01-14
*/

/*
   ____            __   __        __   _
  / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
 _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
     /___/

* Synthetix: RewardEscrowV2.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/RewardEscrowV2.sol
* Docs: https://docs.synthetix.io/contracts/RewardEscrowV2
*
* Contract Dependencies: 
*	- BaseRewardEscrowV2
*	- IAddressResolver
*	- Owned
* Libraries: 
*	- SafeDecimalMath
*	- SafeMath
*	- VestingEntries
*
* MIT License
* ===========
*
* Copyright (c) 2021 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/



pragma solidity ^0.5.16;


// https://docs.synthetix.io/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// https://docs.synthetix.io/contracts/source/interfaces/iaddressresolver
interface IAddressResolver {
    function getAddress(bytes32 name) external view returns (address);

    function getSynth(bytes32 key) external view returns (address);

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address);
}


// https://docs.synthetix.io/contracts/source/interfaces/isynth
interface ISynth {
    // Views
    function currencyKey() external view returns (bytes32);

    function transferableSynths(address account) external view returns (uint);

    // Mutative functions
    function transferAndSettle(address to, uint value) external returns (bool);

    function transferFromAndSettle(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Restricted: used internally to Synthetix
    function burn(address account, uint amount) external;

    function issue(address account, uint amount) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/iissuer
interface IIssuer {
    // Views
    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function canBurnSynths(address account) external view returns (bool);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function collateralisationRatioAndAnyRatesInvalid(address _issuer)
        external
        view
        returns (uint cratio, bool anyRateIsInvalid);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint debtBalance);

    function issuanceRatio() external view returns (uint);

    function lastIssueEvent(address account) external view returns (uint);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function minimumStakeTime() external view returns (uint);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function getSynths(bytes32[] calldata currencyKeys) external view returns (ISynth[] memory);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey, bool excludeEtherCollateral) external view returns (uint);

    function transferableSynthetixAndAnyRateIsInvalid(address account, uint balance)
        external
        view
        returns (uint transferable, bool anyRateIsInvalid);

    // Restricted: used internally to Synthetix
    function issueSynths(address from, uint amount) external;

    function issueSynthsOnBehalf(
        address issueFor,
        address from,
        uint amount
    ) external;

    function issueMaxSynths(address from) external;

    function issueMaxSynthsOnBehalf(address issueFor, address from) external;

    function burnSynths(address from, uint amount) external;

    function burnSynthsOnBehalf(
        address burnForAddress,
        address from,
        uint amount
    ) external;

    function burnSynthsToTarget(address from) external;

    function burnSynthsToTargetOnBehalf(address burnForAddress, address from) external;

    function liquidateDelinquentAccount(
        address account,
        uint susdAmount,
        address liquidator
    ) external returns (uint totalRedeemed, uint amountToLiquidate);
}


// Inheritance


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/addressresolver
contract AddressResolver is Owned, IAddressResolver {
    mapping(bytes32 => address) public repository;

    constructor(address _owner) public Owned(_owner) {}

    /* ========== RESTRICTED FUNCTIONS ========== */

    function importAddresses(bytes32[] calldata names, address[] calldata destinations) external onlyOwner {
        require(names.length == destinations.length, "Input lengths must match");

        for (uint i = 0; i < names.length; i++) {
            bytes32 name = names[i];
            address destination = destinations[i];
            repository[name] = destination;
            emit AddressImported(name, destination);
        }
    }

    /* ========= PUBLIC FUNCTIONS ========== */

    function rebuildCaches(MixinResolver[] calldata destinations) external {
        for (uint i = 0; i < destinations.length; i++) {
            destinations[i].rebuildCache();
        }
    }

    /* ========== VIEWS ========== */

    function areAddressesImported(bytes32[] calldata names, address[] calldata destinations) external view returns (bool) {
        for (uint i = 0; i < names.length; i++) {
            if (repository[names[i]] != destinations[i]) {
                return false;
            }
        }
        return true;
    }

    function getAddress(bytes32 name) external view returns (address) {
        return repository[name];
    }

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address) {
        address _foundAddress = repository[name];
        require(_foundAddress != address(0), reason);
        return _foundAddress;
    }

    function getSynth(bytes32 key) external view returns (address) {
        IIssuer issuer = IIssuer(repository["Issuer"]);
        require(address(issuer) != address(0), "Cannot find Issuer address");
        return address(issuer.synths(key));
    }

    /* ========== EVENTS ========== */

    event AddressImported(bytes32 name, address destination);
}


// solhint-disable payable-fallback

// https://docs.synthetix.io/contracts/source/contracts/readproxy
contract ReadProxy is Owned {
    address public target;

    constructor(address _owner) public Owned(_owner) {}

    function setTarget(address _target) external onlyOwner {
        target = _target;
        emit TargetUpdated(target);
    }

    function() external {
        // The basics of a proxy read call
        // Note that msg.sender in the underlying will always be the address of this contract.
        assembly {
            calldatacopy(0, 0, calldatasize)

            // Use of staticcall - this will revert if the underlying function mutates state
            let result := staticcall(gas, sload(target_slot), 0, calldatasize, 0, 0)
            returndatacopy(0, 0, returndatasize)

            if iszero(result) {
                revert(0, returndatasize)
            }
            return(0, returndatasize)
        }
    }

    event TargetUpdated(address newTarget);
}


// Inheritance


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/mixinresolver
contract MixinResolver {
    AddressResolver public resolver;

    mapping(bytes32 => address) private addressCache;

    constructor(address _resolver) internal {
        resolver = AddressResolver(_resolver);
    }

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

    function combineArrays(bytes32[] memory first, bytes32[] memory second)
        internal
        pure
        returns (bytes32[] memory combination)
    {
        combination = new bytes32[](first.length + second.length);

        for (uint i = 0; i < first.length; i++) {
            combination[i] = first[i];
        }

        for (uint j = 0; j < second.length; j++) {
            combination[first.length + j] = second[j];
        }
    }

    /* ========== PUBLIC FUNCTIONS ========== */

    // Note: this function is public not external in order for it to be overridden and invoked via super in subclasses
    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {}

    function rebuildCache() public {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        // The resolver must call this function whenver it updates its state
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // Note: can only be invoked once the resolver has all the targets needed added
            address destination = resolver.requireAndGetAddress(
                name,
                string(abi.encodePacked("Resolver missing target: ", name))
            );
            addressCache[name] = destination;
            emit CacheUpdated(name, destination);
        }
    }

    /* ========== VIEWS ========== */

    function isResolverCached() external view returns (bool) {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // false if our cache is invalid or if the resolver doesn't have the required address
            if (resolver.getAddress(name) != addressCache[name] || addressCache[name] == address(0)) {
                return false;
            }
        }

        return true;
    }

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

    function requireAndGetAddress(bytes32 name) internal view returns (address) {
        address _foundAddress = addressCache[name];
        require(_foundAddress != address(0), string(abi.encodePacked("Missing address: ", name)));
        return _foundAddress;
    }

    /* ========== EVENTS ========== */

    event CacheUpdated(bytes32 name, address destination);
}


// https://docs.synthetix.io/contracts/source/contracts/limitedsetup
contract LimitedSetup {
    uint public setupExpiryTime;

    /**
     * @dev LimitedSetup Constructor.
     * @param setupDuration The time the setup period will last for.
     */
    constructor(uint setupDuration) internal {
        setupExpiryTime = now + setupDuration;
    }

    modifier onlyDuringSetup {
        require(now < setupExpiryTime, "Can only perform this action during setup");
        _;
    }
}


pragma experimental ABIEncoderV2;


library VestingEntries {
    struct VestingEntry {
        uint64 endTime;
        uint256 escrowAmount;
    }
    struct VestingEntryWithID {
        uint64 endTime;
        uint256 escrowAmount;
        uint256 entryID;
    }
}


interface IRewardEscrowV2 {
    // Views
    function balanceOf(address account) external view returns (uint);

    function numVestingEntries(address account) external view returns (uint);

    function totalEscrowedAccountBalance(address account) external view returns (uint);

    function totalVestedAccountBalance(address account) external view returns (uint);

    function getVestingQuantity(address account, uint256[] calldata entryIDs) external view returns (uint);

    function getVestingSchedules(
        address account,
        uint256 index,
        uint256 pageSize
    ) external view returns (VestingEntries.VestingEntryWithID[] memory);

    function getAccountVestingEntryIDs(
        address account,
        uint256 index,
        uint256 pageSize
    ) external view returns (uint256[] memory);

    function getVestingEntryClaimable(address account, uint256 entryID) external view returns (uint);

    function getVestingEntry(address account, uint256 entryID) external view returns (uint64, uint256);

    // Mutative functions
    function vest(uint256[] calldata entryIDs) external;

    function createEscrowEntry(
        address beneficiary,
        uint256 deposit,
        uint256 duration
    ) external;

    function appendVestingEntry(
        address account,
        uint256 quantity,
        uint256 duration
    ) external;

    function migrateVestingSchedule(address _addressToMigrate) external;

    function migrateAccountEscrowBalances(
        address[] calldata accounts,
        uint256[] calldata escrowBalances,
        uint256[] calldata vestedBalances
    ) external;

    // Account Merging
    function startMergingWindow() external;

    function mergeAccount(address accountToMerge, uint256[] calldata entryIDs) external;

    function nominateAccountToMerge(address account) external;

    function accountMergingIsOpen() external view returns (bool);

    // L2 Migration
    function importVestingEntries(
        address account,
        uint256 escrowedAmount,
        VestingEntries.VestingEntry[] calldata vestingEntries
    ) external;

    // Return amount of SNX transfered to SynthetixBridgeToOptimism deposit contract
    function burnForMigration(address account, uint256[] calldata entryIDs)
        external
        returns (uint256 escrowedAccountBalance, VestingEntries.VestingEntry[] memory vestingEntries);
}


/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}


// Libraries


// https://docs.synthetix.io/contracts/source/libraries/safedecimalmath
library SafeDecimalMath {
    using SafeMath for uint;

    /* Number of decimal places in the representations. */
    uint8 public constant decimals = 18;
    uint8 public constant highPrecisionDecimals = 27;

    /* The number representing 1.0. */
    uint public constant UNIT = 10**uint(decimals);

    /* The number representing 1.0 for higher fidelity numbers. */
    uint public constant PRECISE_UNIT = 10**uint(highPrecisionDecimals);
    uint private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10**uint(highPrecisionDecimals - decimals);

    /**
     * @return Provides an interface to UNIT.
     */
    function unit() external pure returns (uint) {
        return UNIT;
    }

    /**
     * @return Provides an interface to PRECISE_UNIT.
     */
    function preciseUnit() external pure returns (uint) {
        return PRECISE_UNIT;
    }

    /**
     * @return The result of multiplying x and y, interpreting the operands as fixed-point
     * decimals.
     *
     * @dev A unit factor is divided out after the product of x and y is evaluated,
     * so that product must be less than 2**256. As this is an integer division,
     * the internal division always rounds down. This helps save on gas. Rounding
     * is more expensive on gas.
     */
    function multiplyDecimal(uint x, uint y) internal pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        return x.mul(y) / UNIT;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of the specified precision unit.
     *
     * @dev The operands should be in the form of a the specified unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function _multiplyDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        uint quotientTimesTen = x.mul(y) / (precisionUnit / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a precise unit.
     *
     * @dev The operands should be in the precise unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a standard unit.
     *
     * @dev The operands should be in the standard unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is a high
     * precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and UNIT must be less than 2**256. As
     * this is an integer division, the result is always rounded down.
     * This helps save on gas. Rounding is more expensive on gas.
     */
    function divideDecimal(uint x, uint y) internal pure returns (uint) {
        /* Reintroduce the UNIT factor that will be divided out by y. */
        return x.mul(UNIT).div(y);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * decimal in the precision unit specified in the parameter.
     *
     * @dev y is divided after the product of x and the specified precision unit
     * is evaluated, so the product of x and the specified precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function _divideDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        uint resultTimesTen = x.mul(precisionUnit * 10).div(y);

        if (resultTimesTen % 10 >= 5) {
            resultTimesTen += 10;
        }

        return resultTimesTen / 10;
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * standard precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and the standard precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * high precision decimal.
     *
     * @dev y is divided after the product of x and the high precision unit
     * is evaluated, so the product of x and the high precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @dev Convert a standard decimal representation to a high precision one.
     */
    function decimalToPreciseDecimal(uint i) internal pure returns (uint) {
        return i.mul(UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR);
    }

    /**
     * @dev Convert a high precision decimal to a standard decimal representation.
     */
    function preciseDecimalToDecimal(uint i) internal pure returns (uint) {
        uint quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }
}


// https://docs.synthetix.io/contracts/source/interfaces/ierc20
interface IERC20 {
    // ERC20 Optional Views
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    // Views
    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);

    // Mutative functions
    function transfer(address to, uint value) external returns (bool);

    function approve(address spender, uint value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Events
    event Transfer(address indexed from, address indexed to, uint value);

    event Approval(address indexed owner, address indexed spender, uint value);
}


// https://docs.synthetix.io/contracts/source/interfaces/ifeepool
interface IFeePool {
    // Views

    // solhint-disable-next-line func-name-mixedcase
    function FEE_ADDRESS() external view returns (address);

    function feesAvailable(address account) external view returns (uint, uint);

    function feePeriodDuration() external view returns (uint);

    function isFeesClaimable(address account) external view returns (bool);

    function targetThreshold() external view returns (uint);

    function totalFeesAvailable() external view returns (uint);

    function totalRewardsAvailable() external view returns (uint);

    // Mutative Functions
    function claimFees() external returns (bool);

    function claimOnBehalf(address claimingForAddress) external returns (bool);

    function closeCurrentFeePeriod() external;

    // Restricted: used internally to Synthetix
    function appendAccountIssuanceRecord(
        address account,
        uint lockedAmount,
        uint debtEntryIndex
    ) external;

    function recordFeePaid(uint sUSDAmount) external;

    function setRewardsToDistribute(uint amount) external;
}


interface IVirtualSynth {
    // Views
    function balanceOfUnderlying(address account) external view returns (uint);

    function rate() external view returns (uint);

    function readyToSettle() external view returns (bool);

    function secsLeftInWaitingPeriod() external view returns (uint);

    function settled() external view returns (bool);

    function synth() external view returns (ISynth);

    // Mutative functions
    function settle(address account) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/isynthetix
interface ISynthetix {
    // Views
    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint);

    function isWaitingPeriod(bytes32 currencyKey) external view returns (bool);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey) external view returns (uint);

    function totalIssuedSynthsExcludeEtherCollateral(bytes32 currencyKey) external view returns (uint);

    function transferableSynthetix(address account) external view returns (uint transferable);

    // Mutative Functions
    function burnSynths(uint amount) external;

    function burnSynthsOnBehalf(address burnForAddress, uint amount) external;

    function burnSynthsToTarget() external;

    function burnSynthsToTargetOnBehalf(address burnForAddress) external;

    function exchange(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external returns (uint amountReceived);

    function exchangeOnBehalf(
        address exchangeForAddress,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external returns (uint amountReceived);

    function exchangeWithTracking(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address originator,
        bytes32 trackingCode
    ) external returns (uint amountReceived);

    function exchangeOnBehalfWithTracking(
        address exchangeForAddress,
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        address originator,
        bytes32 trackingCode
    ) external returns (uint amountReceived);

    function exchangeWithVirtual(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        bytes32 trackingCode
    ) external returns (uint amountReceived, IVirtualSynth vSynth);

    function issueMaxSynths() external;

    function issueMaxSynthsOnBehalf(address issueForAddress) external;

    function issueSynths(uint amount) external;

    function issueSynthsOnBehalf(address issueForAddress, uint amount) external;

    function mint() external returns (bool);

    function settle(bytes32 currencyKey)
        external
        returns (
            uint reclaimed,
            uint refunded,
            uint numEntries
        );

    // Liquidations
    function liquidateDelinquentAccount(address account, uint susdAmount) external returns (bool);

    // Restricted Functions

    function mintSecondary(address account, uint amount) external;

    function mintSecondaryRewards(uint amount) external;

    function burnSecondary(address account, uint amount) external;
}


// Inheritance


// Libraries


// Internal references


// https://docs.synthetix.io/contracts/RewardEscrow
contract BaseRewardEscrowV2 is Owned, IRewardEscrowV2, LimitedSetup(4 weeks), MixinResolver {
    using SafeMath for uint;
    using SafeDecimalMath for uint;

    mapping(address => mapping(uint256 => VestingEntries.VestingEntry)) public vestingSchedules;

    mapping(address => uint256[]) public accountVestingEntryIDs;

    /*Counter for new vesting entry ids. */
    uint256 public nextEntryId;

    /* An account's total escrowed synthetix balance to save recomputing this for fee extraction purposes. */
    mapping(address => uint256) public totalEscrowedAccountBalance;

    /* An account's total vested reward synthetix. */
    mapping(address => uint256) public totalVestedAccountBalance;

    /* Mapping of nominated address to recieve account merging */
    mapping(address => address) public nominatedReceiver;

    /* The total remaining escrowed balance, for verifying the actual synthetix balance of this contract against. */
    uint256 public totalEscrowedBalance;

    /* Max escrow duration */
    uint public max_duration = 2 * 52 weeks; // Default max 2 years duration

    /* Max account merging duration */
    uint public maxAccountMergingDuration = 4 weeks; // Default 4 weeks is max

    /* ========== ACCOUNT MERGING CONFIGURATION ========== */

    uint public accountMergingDuration = 1 weeks;

    uint public accountMergingStartTime;

    /* ========== ADDRESS RESOLVER CONFIGURATION ========== */

    bytes32 private constant CONTRACT_SYNTHETIX = "Synthetix";
    bytes32 private constant CONTRACT_ISSUER = "Issuer";
    bytes32 private constant CONTRACT_FEEPOOL = "FeePool";

    /* ========== CONSTRUCTOR ========== */

    constructor(address _owner, address _resolver) public Owned(_owner) MixinResolver(_resolver) {
        nextEntryId = 1;
    }

    /* ========== VIEWS ======================= */

    function feePool() internal view returns (IFeePool) {
        return IFeePool(requireAndGetAddress(CONTRACT_FEEPOOL));
    }

    function synthetix() internal view returns (ISynthetix) {
        return ISynthetix(requireAndGetAddress(CONTRACT_SYNTHETIX));
    }

    function issuer() internal view returns (IIssuer) {
        return IIssuer(requireAndGetAddress(CONTRACT_ISSUER));
    }

    function _notImplemented() internal pure {
        revert("Cannot be run on this layer");
    }

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

    // Note: use public visibility so that it can be invoked in a subclass
    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        addresses = new bytes32[](3);
        addresses[0] = CONTRACT_SYNTHETIX;
        addresses[1] = CONTRACT_FEEPOOL;
        addresses[2] = CONTRACT_ISSUER;
    }

    /**
     * @notice A simple alias to totalEscrowedAccountBalance: provides ERC20 balance integration.
     */
    function balanceOf(address account) public view returns (uint) {
        return totalEscrowedAccountBalance[account];
    }

    /**
     * @notice The number of vesting dates in an account's schedule.
     */
    function numVestingEntries(address account) external view returns (uint) {
        return accountVestingEntryIDs[account].length;
    }

    /**
     * @notice Get a particular schedule entry for an account.
     * @return The vesting entry object and rate per second emission.
     */
    function getVestingEntry(address account, uint256 entryID) external view returns (uint64 endTime, uint256 escrowAmount) {
        endTime = vestingSchedules[account][entryID].endTime;
        escrowAmount = vestingSchedules[account][entryID].escrowAmount;
    }

    function getVestingSchedules(
        address account,
        uint256 index,
        uint256 pageSize
    ) external view returns (VestingEntries.VestingEntryWithID[] memory) {
        uint256 endIndex = index + pageSize;

        // If index starts after the endIndex return no results
        if (endIndex <= index) {
            return new VestingEntries.VestingEntryWithID[](0);
        }

        // If the page extends past the end of the accountVestingEntryIDs, truncate it.
        if (endIndex > accountVestingEntryIDs[account].length) {
            endIndex = accountVestingEntryIDs[account].length;
        }

        uint256 n = endIndex - index;
        VestingEntries.VestingEntryWithID[] memory vestingEntries = new VestingEntries.VestingEntryWithID[](n);
        for (uint256 i; i < n; i++) {
            uint256 entryID = accountVestingEntryIDs[account][i + index];

            VestingEntries.VestingEntry memory entry = vestingSchedules[account][entryID];

            vestingEntries[i] = VestingEntries.VestingEntryWithID({
                endTime: uint64(entry.endTime),
                escrowAmount: entry.escrowAmount,
                entryID: entryID
            });
        }
        return vestingEntries;
    }

    function getAccountVestingEntryIDs(
        address account,
        uint256 index,
        uint256 pageSize
    ) external view returns (uint256[] memory) {
        uint256 endIndex = index + pageSize;

        // If the page extends past the end of the accountVestingEntryIDs, truncate it.
        if (endIndex > accountVestingEntryIDs[account].length) {
            endIndex = accountVestingEntryIDs[account].length;
        }
        if (endIndex <= index) {
            return new uint256[](0);
        }

        uint256 n = endIndex - index;
        uint256[] memory page = new uint256[](n);
        for (uint256 i; i < n; i++) {
            page[i] = accountVestingEntryIDs[account][i + index];
        }
        return page;
    }

    function getVestingQuantity(address account, uint256[] calldata entryIDs) external view returns (uint total) {
        for (uint i = 0; i < entryIDs.length; i++) {
            VestingEntries.VestingEntry memory entry = vestingSchedules[account][entryIDs[i]];

            /* Skip entry if escrowAmount == 0 */
            if (entry.escrowAmount != 0) {
                uint256 quantity = _claimableAmount(entry);

                /* add quantity to total */
                total = total.add(quantity);
            }
        }
    }

    function getVestingEntryClaimable(address account, uint256 entryID) external view returns (uint) {
        VestingEntries.VestingEntry memory entry = vestingSchedules[account][entryID];
        return _claimableAmount(entry);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    /**
     * Vest escrowed amounts that are claimable
     * Allows users to vest their vesting entries based on msg.sender
     */

    function vest(uint256[] calldata entryIDs) external {
        uint256 total;
        for (uint i = 0; i < entryIDs.length; i++) {
            VestingEntries.VestingEntry storage entry = vestingSchedules[msg.sender][entryIDs[i]];

            /* Skip entry if escrowAmount == 0 already vested */
            if (entry.escrowAmount != 0) {
                uint256 quantity = _claimableAmount(entry);

                /* update entry to remove escrowAmount */
                if (quantity > 0) {
                    entry.escrowAmount = 0;
                }

                /* add quantity to total */
                total = total.add(quantity);
            }
        }

        /* Transfer vested tokens. Will revert if total > totalEscrowedAccountBalance */
        if (total != 0) {
            _transferVestedTokens(msg.sender, total);
        }
    }

    function _claimableAmount(VestingEntries.VestingEntry memory _entry) internal view returns (uint256) {
        uint256 quantity;
        if (_entry.escrowAmount != 0) {
            /* Escrow amounts claimable if block.timestamp equal to or after entry endTime */
            quantity = block.timestamp > _entry.endTime ? _entry.escrowAmount : 0;
        }
        return quantity;
    }

    /**
     * @notice Create an escrow entry to lock SNX for a given duration in seconds
     * @dev This call expects that the depositor (msg.sender) has already approved the Reward escrow contract
     to spend the the amount being escrowed.
     */
    function createEscrowEntry(
        address beneficiary,
        uint256 deposit,
        uint256 duration
    ) external {
        require(beneficiary != address(0), "Cannot create escrow with address(0)");

        /* Transfer SNX from msg.sender */
        require(IERC20(address(synthetix())).transferFrom(msg.sender, address(this), deposit), "token transfer failed");

        /* Append vesting entry for the beneficiary address */
        _appendVestingEntry(beneficiary, deposit, duration);
    }

    /**
     * @notice Add a new vesting entry at a given time and quantity to an account's schedule.
     * @dev A call to this should accompany a previous successful call to synthetix.transfer(rewardEscrow, amount),
     * to ensure that when the funds are withdrawn, there is enough balance.
     * @param account The account to append a new vesting entry to.
     * @param quantity The quantity of SNX that will be escrowed.
     * @param duration The duration that SNX will be emitted.
     */
    function appendVestingEntry(
        address account,
        uint256 quantity,
        uint256 duration
    ) external onlyFeePool {
        _appendVestingEntry(account, quantity, duration);
    }

    /* Transfer vested tokens and update totalEscrowedAccountBalance, totalVestedAccountBalance */
    function _transferVestedTokens(address _account, uint256 _amount) internal {
        _reduceAccountEscrowBalances(_account, _amount);
        totalVestedAccountBalance[_account] = totalVestedAccountBalance[_account].add(_amount);
        IERC20(address(synthetix())).transfer(_account, _amount);
        emit Vested(_account, block.timestamp, _amount);
    }

    function _reduceAccountEscrowBalances(address _account, uint256 _amount) internal {
        // Reverts if amount being vested is greater than the account's existing totalEscrowedAccountBalance
        totalEscrowedBalance = totalEscrowedBalance.sub(_amount);
        totalEscrowedAccountBalance[_account] = totalEscrowedAccountBalance[_account].sub(_amount);
    }

    /* ========== ACCOUNT MERGING ========== */

    function accountMergingIsOpen() public view returns (bool) {
        return accountMergingStartTime.add(accountMergingDuration) > block.timestamp;
    }

    function startMergingWindow() external onlyOwner {
        accountMergingStartTime = block.timestamp;
        emit AccountMergingStarted(accountMergingStartTime, accountMergingStartTime.add(accountMergingDuration));
    }

    function setAccountMergingDuration(uint256 duration) external onlyOwner {
        require(duration <= maxAccountMergingDuration, "exceeds max merging duration");
        accountMergingDuration = duration;
        emit AccountMergingDurationUpdated(duration);
    }

    function setMaxAccountMergingWindow(uint256 duration) external onlyOwner {
        maxAccountMergingDuration = duration;
        emit MaxAccountMergingDurationUpdated(duration);
    }

    function setMaxEscrowDuration(uint256 duration) external onlyOwner {
        max_duration = duration;
        emit MaxEscrowDurationUpdated(duration);
    }

    /* Nominate an account to merge escrow and vesting schedule */
    function nominateAccountToMerge(address account) external {
        require(account != msg.sender, "Cannot nominate own account to merge");
        require(accountMergingIsOpen(), "Account merging has ended");
        require(issuer().debtBalanceOf(msg.sender, "sUSD") == 0, "Cannot merge accounts with debt");
        nominatedReceiver[msg.sender] = account;
        emit NominateAccountToMerge(msg.sender, account);
    }

    function mergeAccount(address accountToMerge, uint256[] calldata entryIDs) external {
        require(accountMergingIsOpen(), "Account merging has ended");
        require(issuer().debtBalanceOf(accountToMerge, "sUSD") == 0, "Cannot merge accounts with debt");
        require(nominatedReceiver[accountToMerge] == msg.sender, "Address is not nominated to merge");

        uint256 totalEscrowAmountMerged;
        for (uint i = 0; i < entryIDs.length; i++) {
            // retrieve entry
            VestingEntries.VestingEntry memory entry = vestingSchedules[accountToMerge][entryIDs[i]];

            /* ignore vesting entries with zero escrowAmount */
            if (entry.escrowAmount != 0) {
                /* copy entry to msg.sender (destination address) */
                vestingSchedules[msg.sender][entryIDs[i]] = entry;

                /* Add the escrowAmount of entry to the totalEscrowAmountMerged */
                totalEscrowAmountMerged = totalEscrowAmountMerged.add(entry.escrowAmount);

                /* append entryID to list of entries for account */
                accountVestingEntryIDs[msg.sender].push(entryIDs[i]);

                /* Delete entry from accountToMerge */
                delete vestingSchedules[accountToMerge][entryIDs[i]];
            }
        }

        /* update totalEscrowedAccountBalance for merged account and accountToMerge */
        totalEscrowedAccountBalance[accountToMerge] = totalEscrowedAccountBalance[accountToMerge].sub(
            totalEscrowAmountMerged
        );
        totalEscrowedAccountBalance[msg.sender] = totalEscrowedAccountBalance[msg.sender].add(totalEscrowAmountMerged);

        emit AccountMerged(accountToMerge, msg.sender, totalEscrowAmountMerged, entryIDs, block.timestamp);
    }

    /* Internal function for importing vesting entry and creating new entry for escrow liquidations */
    function _addVestingEntry(address account, VestingEntries.VestingEntry memory entry) internal returns (uint) {
        uint entryID = nextEntryId;
        vestingSchedules[account][entryID] = entry;

        /* append entryID to list of entries for account */
        accountVestingEntryIDs[account].push(entryID);

        /* Increment the next entry id. */
        nextEntryId = nextEntryId.add(1);

        return entryID;
    }

    /* ========== MIGRATION OLD ESCROW ========== */

    function migrateVestingSchedule(address) external {
        _notImplemented();
    }

    function migrateAccountEscrowBalances(
        address[] calldata,
        uint256[] calldata,
        uint256[] calldata
    ) external {
        _notImplemented();
    }

    /* ========== L2 MIGRATION ========== */

    function burnForMigration(address, uint[] calldata) external returns (uint256, VestingEntries.VestingEntry[] memory) {
        _notImplemented();
    }

    function importVestingEntries(
        address,
        uint256,
        VestingEntries.VestingEntry[] calldata
    ) external {
        _notImplemented();
    }

    /* ========== INTERNALS ========== */

    function _appendVestingEntry(
        address account,
        uint256 quantity,
        uint256 duration
    ) internal {
        /* No empty or already-passed vesting entries allowed. */
        require(quantity != 0, "Quantity cannot be zero");
        require(duration > 0 && duration <= max_duration, "Cannot escrow with 0 duration OR above max_duration");

        /* There must be enough balance in the contract to provide for the vesting entry. */
        totalEscrowedBalance = totalEscrowedBalance.add(quantity);

        require(
            totalEscrowedBalance <= IERC20(address(synthetix())).balanceOf(address(this)),
            "Must be enough balance in the contract to provide for the vesting entry"
        );

        /* Escrow the tokens for duration. */
        uint endTime = block.timestamp + duration;

        /* Add quantity to account's escrowed balance */
        totalEscrowedAccountBalance[account] = totalEscrowedAccountBalance[account].add(quantity);

        uint entryID = nextEntryId;
        vestingSchedules[account][entryID] = VestingEntries.VestingEntry({endTime: uint64(endTime), escrowAmount: quantity});

        accountVestingEntryIDs[account].push(entryID);

        /* Increment the next entry id. */
        nextEntryId = nextEntryId.add(1);

        emit VestingEntryCreated(account, block.timestamp, quantity, duration, entryID);
    }

    /* ========== MODIFIERS ========== */
    modifier onlyFeePool() {
        require(msg.sender == address(feePool()), "Only the FeePool can perform this action");
        _;
    }

    /* ========== EVENTS ========== */
    event Vested(address indexed beneficiary, uint time, uint value);
    event VestingEntryCreated(address indexed beneficiary, uint time, uint value, uint duration, uint entryID);
    event MaxEscrowDurationUpdated(uint newDuration);
    event MaxAccountMergingDurationUpdated(uint newDuration);
    event AccountMergingDurationUpdated(uint newDuration);
    event AccountMergingStarted(uint time, uint endTime);
    event AccountMerged(
        address indexed accountToMerge,
        address destinationAddress,
        uint escrowAmountMerged,
        uint[] entryIDs,
        uint time
    );
    event NominateAccountToMerge(address indexed account, address destination);
}


// https://docs.synthetix.io/contracts/source/interfaces/irewardescrow
interface IRewardEscrow {
    // Views
    function balanceOf(address account) external view returns (uint);

    function numVestingEntries(address account) external view returns (uint);

    function totalEscrowedAccountBalance(address account) external view returns (uint);

    function totalVestedAccountBalance(address account) external view returns (uint);

    function getVestingScheduleEntry(address account, uint index) external view returns (uint[2] memory);

    function getNextVestingIndex(address account) external view returns (uint);

    // Mutative functions
    function appendVestingEntry(address account, uint quantity) external;

    function vest() external;
}


// https://docs.synthetix.io/contracts/source/interfaces/isystemstatus
interface ISystemStatus {
    struct Status {
        bool canSuspend;
        bool canResume;
    }

    struct Suspension {
        bool suspended;
        // reason is an integer code,
        // 0 => no reason, 1 => upgrading, 2+ => defined by system usage
        uint248 reason;
    }

    // Views
    function accessControl(bytes32 section, address account) external view returns (bool canSuspend, bool canResume);

    function requireSystemActive() external view;

    function requireIssuanceActive() external view;

    function requireExchangeActive() external view;

    function requireSynthActive(bytes32 currencyKey) external view;

    function requireSynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;

    function synthSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);

    // Restricted functions
    function suspendSynth(bytes32 currencyKey, uint256 reason) external;

    function updateAccessControl(
        bytes32 section,
        address account,
        bool canSuspend,
        bool canResume
    ) external;
}


// Inheritance


// Internal references


// https://docs.synthetix.io/contracts/RewardEscrow
contract RewardEscrowV2 is BaseRewardEscrowV2 {
    mapping(address => uint256) public totalBalancePendingMigration;

    uint public migrateEntriesThresholdAmount = SafeDecimalMath.unit() * 1000; // Default 1000 SNX

    /* ========== ADDRESS RESOLVER CONFIGURATION ========== */

    bytes32 private constant CONTRACT_SYNTHETIX_BRIDGE_OPTIMISM = "SynthetixBridgeToOptimism";
    bytes32 private constant CONTRACT_REWARD_ESCROW = "RewardEscrow";
    bytes32 private constant CONTRACT_SYSTEMSTATUS = "SystemStatus";

    /* ========== CONSTRUCTOR ========== */

    constructor(address _owner, address _resolver) public BaseRewardEscrowV2(_owner, _resolver) {}

    /* ========== VIEWS ======================= */

    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        bytes32[] memory existingAddresses = BaseRewardEscrowV2.resolverAddressesRequired();
        bytes32[] memory newAddresses = new bytes32[](3);
        newAddresses[0] = CONTRACT_SYNTHETIX_BRIDGE_OPTIMISM;
        newAddresses[1] = CONTRACT_REWARD_ESCROW;
        newAddresses[2] = CONTRACT_SYSTEMSTATUS;
        return combineArrays(existingAddresses, newAddresses);
    }

    function synthetixBridgeToOptimism() internal view returns (address) {
        return requireAndGetAddress(CONTRACT_SYNTHETIX_BRIDGE_OPTIMISM);
    }

    function oldRewardEscrow() internal view returns (IRewardEscrow) {
        return IRewardEscrow(requireAndGetAddress(CONTRACT_REWARD_ESCROW));
    }

    function systemStatus() internal view returns (ISystemStatus) {
        return ISystemStatus(requireAndGetAddress(CONTRACT_SYSTEMSTATUS));
    }

    /* ========== OLD ESCROW LOOKUP ========== */

    uint internal constant TIME_INDEX = 0;
    uint internal constant QUANTITY_INDEX = 1;

    /* ========== MIGRATION OLD ESCROW ========== */

    /* Threshold amount for migrating escrow entries from old RewardEscrow */
    function setMigrateEntriesThresholdAmount(uint amount) external onlyOwner {
        migrateEntriesThresholdAmount = amount;
        emit MigrateEntriesThresholdAmountUpdated(amount);
    }

    /* Function to allow any address to migrate vesting entries from previous reward escrow */
    function migrateVestingSchedule(address addressToMigrate) external systemActive {
        /* Ensure account escrow balance pending migration is not zero */
        /* Ensure account escrowed balance is not zero - should have been migrated */
        require(totalBalancePendingMigration[addressToMigrate] > 0, "No escrow migration pending");
        require(totalEscrowedAccountBalance[addressToMigrate] > 0, "Address escrow balance is 0");

        /* Add a vestable entry for addresses with totalBalancePendingMigration <= migrateEntriesThreshold amount of SNX */
        if (totalBalancePendingMigration[addressToMigrate] <= migrateEntriesThresholdAmount) {
            _importVestingEntry(
                addressToMigrate,
                VestingEntries.VestingEntry({
                    endTime: uint64(block.timestamp),
                    escrowAmount: totalBalancePendingMigration[addressToMigrate]
                })
            );

            /* Remove totalBalancePendingMigration[addressToMigrate] */
            delete totalBalancePendingMigration[addressToMigrate];
        } else {
            uint numEntries = oldRewardEscrow().numVestingEntries(addressToMigrate);

            /* iterate and migrate old escrow schedules from rewardEscrow.vestingSchedules
             * starting from the last entry in each staker's vestingSchedules
             */
            for (uint i = 1; i <= numEntries; i++) {
                uint[2] memory vestingSchedule = oldRewardEscrow().getVestingScheduleEntry(addressToMigrate, numEntries - i);

                uint time = vestingSchedule[TIME_INDEX];
                uint amount = vestingSchedule[QUANTITY_INDEX];

                /* The list is sorted, when we reach the first entry that can be vested stop */
                if (time < block.timestamp) {
                    break;
                }

                /* import vesting entry */
                _importVestingEntry(
                    addressToMigrate,
                    VestingEntries.VestingEntry({endTime: uint64(time), escrowAmount: amount})
                );

                /* subtract amount from totalBalancePendingMigration - reverts if insufficient */
                totalBalancePendingMigration[addressToMigrate] = totalBalancePendingMigration[addressToMigrate].sub(amount);
            }
        }
    }

    /**
     * Import function for owner to import vesting schedule
     * All entries imported should have past their vesting timestamp and will be ready to be vested
     * Addresses with totalEscrowedAccountBalance == 0 will not be migrated as they have all vested
     */
    function importVestingSchedule(address[] calldata accounts, uint256[] calldata escrowAmounts)
        external
        onlyDuringSetup
        onlyOwner
    {
        require(accounts.length == escrowAmounts.length, "Account and escrowAmounts Length mismatch");

        for (uint i = 0; i < accounts.length; i++) {
            address addressToMigrate = accounts[i];
            uint256 escrowAmount = escrowAmounts[i];

            // ensure account have escrow migration pending
            require(totalEscrowedAccountBalance[addressToMigrate] > 0, "Address escrow balance is 0");
            require(totalBalancePendingMigration[addressToMigrate] > 0, "No escrow migration pending");

            /* Import vesting entry with endTime as block.timestamp and escrowAmount */
            _importVestingEntry(
                addressToMigrate,
                VestingEntries.VestingEntry({endTime: uint64(block.timestamp), escrowAmount: escrowAmount})
            );

            /* update totalBalancePendingMigration - reverts if escrowAmount > remaining balance to migrate */
            totalBalancePendingMigration[addressToMigrate] = totalBalancePendingMigration[addressToMigrate].sub(
                escrowAmount
            );

            emit ImportedVestingSchedule(addressToMigrate, block.timestamp, escrowAmount);
        }
    }

    /**
     * Migration for owner to migrate escrowed and vested account balances
     * Addresses with totalEscrowedAccountBalance == 0 will not be migrated as they have all vested
     */
    function migrateAccountEscrowBalances(
        address[] calldata accounts,
        uint256[] calldata escrowBalances,
        uint256[] calldata vestedBalances
    ) external onlyDuringSetup onlyOwner {
        require(accounts.length == escrowBalances.length, "Number of accounts and balances don't match");
        require(accounts.length == vestedBalances.length, "Number of accounts and vestedBalances don't match");

        for (uint i = 0; i < accounts.length; i++) {
            address account = accounts[i];
            uint escrowedAmount = escrowBalances[i];
            uint vestedAmount = vestedBalances[i];

            // ensure account doesn't have escrow migration pending / being imported more than once
            require(totalBalancePendingMigration[account] == 0, "Account migration is pending already");

            /* Update totalEscrowedBalance for tracking the Synthetix balance of this contract. */
            totalEscrowedBalance = totalEscrowedBalance.add(escrowedAmount);

            /* Update totalEscrowedAccountBalance and totalVestedAccountBalance for each account */
            totalEscrowedAccountBalance[account] = totalEscrowedAccountBalance[account].add(escrowedAmount);
            totalVestedAccountBalance[account] = totalVestedAccountBalance[account].add(vestedAmount);

            /* update totalBalancePendingMigration for account */
            totalBalancePendingMigration[account] = escrowedAmount;

            emit MigratedAccountEscrow(account, escrowedAmount, vestedAmount, now);
        }
    }

    /* Internal function to add entry to vestingSchedules and emit event */
    function _importVestingEntry(address account, VestingEntries.VestingEntry memory entry) internal {
        /* add vesting entry to account and assign an entryID to it */
        uint entryID = BaseRewardEscrowV2._addVestingEntry(account, entry);

        emit ImportedVestingEntry(account, entryID, entry.escrowAmount, entry.endTime);
    }

    /* ========== L2 MIGRATION ========== */

    function burnForMigration(address account, uint[] calldata entryIDs)
        external
        onlySynthetixBridge
        returns (uint256 escrowedAccountBalance, VestingEntries.VestingEntry[] memory vestingEntries)
    {
        require(entryIDs.length > 0, "Entry IDs required");

        vestingEntries = new VestingEntries.VestingEntry[](entryIDs.length);

        for (uint i = 0; i < entryIDs.length; i++) {
            VestingEntries.VestingEntry storage entry = vestingSchedules[account][entryIDs[i]];

            if (entry.escrowAmount > 0) {
                vestingEntries[i] = entry;

                /* add the escrow amount to escrowedAccountBalance */
                escrowedAccountBalance = escrowedAccountBalance.add(entry.escrowAmount);

                /* Delete the vesting entry being migrated */
                delete vestingSchedules[account][entryIDs[i]];
            }
        }

        /**
         *  update account total escrow balances for migration
         *  transfer the escrowed SNX being migrated to the L2 deposit contract
         */
        if (escrowedAccountBalance > 0) {
            _reduceAccountEscrowBalances(account, escrowedAccountBalance);
            IERC20(address(synthetix())).transfer(synthetixBridgeToOptimism(), escrowedAccountBalance);
        }

        emit BurnedForMigrationToL2(account, entryIDs, escrowedAccountBalance, block.timestamp);

        return (escrowedAccountBalance, vestingEntries);
    }

    /* ========== MODIFIERS ========== */

    modifier onlySynthetixBridge() {
        require(msg.sender == synthetixBridgeToOptimism(), "Can only be invoked by SynthetixBridgeToOptimism contract");
        _;
    }

    modifier systemActive() {
        systemStatus().requireSystemActive();
        _;
    }

    /* ========== EVENTS ========== */
    event MigratedAccountEscrow(address indexed account, uint escrowedAmount, uint vestedAmount, uint time);
    event ImportedVestingSchedule(address indexed account, uint time, uint escrowAmount);
    event BurnedForMigrationToL2(address indexed account, uint[] entryIDs, uint escrowedAmountMigrated, uint time);
    event ImportedVestingEntry(address indexed account, uint entryID, uint escrowAmount, uint endTime);
    event MigrateEntriesThresholdAmountUpdated(uint newAmount);
}

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uts":[],"name":"accountMergingIsOpen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"accountMergingStartTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"accountVestingEntryIDs","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"quantity","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"}],"name":"appendVestingEntry","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256[]","name":"entryIDs","type":"uint256[]"}],"name":"burnForMigration","outputs":[{"internalType":"uint256","name":"escrowedAccountBalance","type":"uint256"},{"components":[{"internalType":"uint64","name":"endTime","type":"uint64"},{"internalType":"uint256","name":"escrowAmount","type":"uint256"}],"internalType":"struct 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VestingEntries.VestingEntryWithID[]","name":"","type":"tuple[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"components":[{"internalType":"uint64","name":"endTime","type":"uint64"},{"internalType":"uint256","name":"escrowAmount","type":"uint256"}],"internalType":"struct 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000000000000000000000000b64ff7a4a33acdf48d97dab0d764afd0f6176882000000000000000000000000242a3df52c375bee81b1c668741d7c63af68fdd2

-----Decoded View---------------
Arg [0] : _owner (address): 0xb64ff7a4a33acdf48d97dab0d764afd0f6176882
Arg [1] : _resolver (address): 0x242a3df52c375bee81b1c668741d7c63af68fdd2

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000b64ff7a4a33acdf48d97dab0d764afd0f6176882
Arg [1] : 000000000000000000000000242a3df52c375bee81b1c668741d7c63af68fdd2

SafeDecimalMath : 0x1a60e2e2a8be0bc2b6381dd31fd3fd5f9a28de4c