Contract 0x063E110E614474Aa1FFB36936aBED4b1d173e5fc

/**
 *Submitted for verification at Etherscan.io on 2022-11-03
*/

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

* Synthetix: SystemSettings.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/SystemSettings.sol
* Docs: https://docs.synthetix.io/contracts/SystemSettings
*
* Contract Dependencies: 
*	- IAddressResolver
*	- ISystemSettings
*	- MixinResolver
*	- MixinSystemSettings
*	- Owned
* Libraries: 
*	- SafeDecimalMath
*	- SafeMath
*	- SystemSettingsLib
*
* MIT License
* ===========
*
* Copyright (c) 2022 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 allNetworksDebtInfo()
        external
        view
        returns (
            uint256 debt,
            uint256 sharesSupply,
            bool isStale
        );

    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 excludeOtherCollateral) external view returns (uint);

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

    function liquidationAmounts(address account, bool isSelfLiquidation)
        external
        view
        returns (
            uint totalRedeemed,
            uint debtToRemove,
            uint escrowToLiquidate,
            uint initialDebtBalance
        );

    // Restricted: used internally to Synthetix
    function addSynths(ISynth[] calldata synthsToAdd) external;

    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 burnForRedemption(
        address deprecatedSynthProxy,
        address account,
        uint balance
    ) external;

    function setCurrentPeriodId(uint128 periodId) external;

    function liquidateAccount(address account, bool isSelfLiquidation)
        external
        returns (
            uint totalRedeemed,
            uint debtRemoved,
            uint escrowToLiquidate
        );

    function issueSynthsWithoutDebt(
        bytes32 currencyKey,
        address to,
        uint amount
    ) external returns (bool rateInvalid);

    function burnSynthsWithoutDebt(
        bytes32 currencyKey,
        address to,
        uint amount
    ) external returns (bool rateInvalid);
}


// 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);
}


// 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/interfaces/iflexiblestorage
interface IFlexibleStorage {
    // Views
    function getUIntValue(bytes32 contractName, bytes32 record) external view returns (uint);

    function getUIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (uint[] memory);

    function getIntValue(bytes32 contractName, bytes32 record) external view returns (int);

    function getIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (int[] memory);

    function getAddressValue(bytes32 contractName, bytes32 record) external view returns (address);

    function getAddressValues(bytes32 contractName, bytes32[] calldata records) external view returns (address[] memory);

    function getBoolValue(bytes32 contractName, bytes32 record) external view returns (bool);

    function getBoolValues(bytes32 contractName, bytes32[] calldata records) external view returns (bool[] memory);

    function getBytes32Value(bytes32 contractName, bytes32 record) external view returns (bytes32);

    function getBytes32Values(bytes32 contractName, bytes32[] calldata records) external view returns (bytes32[] memory);

    // Mutative functions
    function deleteUIntValue(bytes32 contractName, bytes32 record) external;

    function deleteIntValue(bytes32 contractName, bytes32 record) external;

    function deleteAddressValue(bytes32 contractName, bytes32 record) external;

    function deleteBoolValue(bytes32 contractName, bytes32 record) external;

    function deleteBytes32Value(bytes32 contractName, bytes32 record) external;

    function setUIntValue(
        bytes32 contractName,
        bytes32 record,
        uint value
    ) external;

    function setUIntValues(
        bytes32 contractName,
        bytes32[] calldata records,
        uint[] calldata values
    ) external;

    function setIntValue(
        bytes32 contractName,
        bytes32 record,
        int value
    ) external;

    function setIntValues(
        bytes32 contractName,
        bytes32[] calldata records,
        int[] calldata values
    ) external;

    function setAddressValue(
        bytes32 contractName,
        bytes32 record,
        address value
    ) external;

    function setAddressValues(
        bytes32 contractName,
        bytes32[] calldata records,
        address[] calldata values
    ) external;

    function setBoolValue(
        bytes32 contractName,
        bytes32 record,
        bool value
    ) external;

    function setBoolValues(
        bytes32 contractName,
        bytes32[] calldata records,
        bool[] calldata values
    ) external;

    function setBytes32Value(
        bytes32 contractName,
        bytes32 record,
        bytes32 value
    ) external;

    function setBytes32Values(
        bytes32 contractName,
        bytes32[] calldata records,
        bytes32[] calldata values
    ) external;
}


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/mixinsystemsettings
contract MixinSystemSettings is MixinResolver {
    // must match the one defined SystemSettingsLib, defined in both places due to sol v0.5 limitations
    bytes32 internal constant SETTING_CONTRACT_NAME = "SystemSettings";

    bytes32 internal constant SETTING_WAITING_PERIOD_SECS = "waitingPeriodSecs";
    bytes32 internal constant SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR = "priceDeviationThresholdFactor";
    bytes32 internal constant SETTING_ISSUANCE_RATIO = "issuanceRatio";
    bytes32 internal constant SETTING_FEE_PERIOD_DURATION = "feePeriodDuration";
    bytes32 internal constant SETTING_TARGET_THRESHOLD = "targetThreshold";
    bytes32 internal constant SETTING_LIQUIDATION_DELAY = "liquidationDelay";
    bytes32 internal constant SETTING_LIQUIDATION_RATIO = "liquidationRatio";
    bytes32 internal constant SETTING_LIQUIDATION_ESCROW_DURATION = "liquidationEscrowDuration";
    bytes32 internal constant SETTING_LIQUIDATION_PENALTY = "liquidationPenalty";
    bytes32 internal constant SETTING_SNX_LIQUIDATION_PENALTY = "snxLiquidationPenalty";
    bytes32 internal constant SETTING_SELF_LIQUIDATION_PENALTY = "selfLiquidationPenalty";
    bytes32 internal constant SETTING_FLAG_REWARD = "flagReward";
    bytes32 internal constant SETTING_LIQUIDATE_REWARD = "liquidateReward";
    bytes32 internal constant SETTING_RATE_STALE_PERIOD = "rateStalePeriod";
    /* ========== Exchange Fees Related ========== */
    bytes32 internal constant SETTING_EXCHANGE_FEE_RATE = "exchangeFeeRate";
    bytes32 internal constant SETTING_EXCHANGE_DYNAMIC_FEE_THRESHOLD = "exchangeDynamicFeeThreshold";
    bytes32 internal constant SETTING_EXCHANGE_DYNAMIC_FEE_WEIGHT_DECAY = "exchangeDynamicFeeWeightDecay";
    bytes32 internal constant SETTING_EXCHANGE_DYNAMIC_FEE_ROUNDS = "exchangeDynamicFeeRounds";
    bytes32 internal constant SETTING_EXCHANGE_MAX_DYNAMIC_FEE = "exchangeMaxDynamicFee";
    /* ========== End Exchange Fees Related ========== */
    bytes32 internal constant SETTING_MINIMUM_STAKE_TIME = "minimumStakeTime";
    bytes32 internal constant SETTING_AGGREGATOR_WARNING_FLAGS = "aggregatorWarningFlags";
    bytes32 internal constant SETTING_TRADING_REWARDS_ENABLED = "tradingRewardsEnabled";
    bytes32 internal constant SETTING_DEBT_SNAPSHOT_STALE_TIME = "debtSnapshotStaleTime";
    bytes32 internal constant SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT = "crossDomainDepositGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT = "crossDomainEscrowGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT = "crossDomainRewardGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT = "crossDomainWithdrawalGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_FEE_PERIOD_CLOSE_GAS_LIMIT = "crossDomainCloseGasLimit";
    bytes32 internal constant SETTING_CROSS_DOMAIN_RELAY_GAS_LIMIT = "crossDomainRelayGasLimit";
    bytes32 internal constant SETTING_ETHER_WRAPPER_MAX_ETH = "etherWrapperMaxETH";
    bytes32 internal constant SETTING_ETHER_WRAPPER_MINT_FEE_RATE = "etherWrapperMintFeeRate";
    bytes32 internal constant SETTING_ETHER_WRAPPER_BURN_FEE_RATE = "etherWrapperBurnFeeRate";
    bytes32 internal constant SETTING_WRAPPER_MAX_TOKEN_AMOUNT = "wrapperMaxTokens";
    bytes32 internal constant SETTING_WRAPPER_MINT_FEE_RATE = "wrapperMintFeeRate";
    bytes32 internal constant SETTING_WRAPPER_BURN_FEE_RATE = "wrapperBurnFeeRate";
    bytes32 internal constant SETTING_INTERACTION_DELAY = "interactionDelay";
    bytes32 internal constant SETTING_COLLAPSE_FEE_RATE = "collapseFeeRate";
    bytes32 internal constant SETTING_ATOMIC_MAX_VOLUME_PER_BLOCK = "atomicMaxVolumePerBlock";
    bytes32 internal constant SETTING_ATOMIC_TWAP_WINDOW = "atomicTwapWindow";
    bytes32 internal constant SETTING_ATOMIC_EQUIVALENT_FOR_DEX_PRICING = "atomicEquivalentForDexPricing";
    bytes32 internal constant SETTING_ATOMIC_EXCHANGE_FEE_RATE = "atomicExchangeFeeRate";
    bytes32 internal constant SETTING_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW = "atomicVolConsiderationWindow";
    bytes32 internal constant SETTING_ATOMIC_VOLATILITY_UPDATE_THRESHOLD = "atomicVolUpdateThreshold";
    bytes32 internal constant SETTING_PURE_CHAINLINK_PRICE_FOR_ATOMIC_SWAPS_ENABLED = "pureChainlinkForAtomicsEnabled";
    bytes32 internal constant SETTING_CROSS_SYNTH_TRANSFER_ENABLED = "crossChainSynthTransferEnabled";

    bytes32 internal constant CONTRACT_FLEXIBLESTORAGE = "FlexibleStorage";

    enum CrossDomainMessageGasLimits {Deposit, Escrow, Reward, Withdrawal, CloseFeePeriod, Relay}

    struct DynamicFeeConfig {
        uint threshold;
        uint weightDecay;
        uint rounds;
        uint maxFee;
    }

    constructor(address _resolver) internal MixinResolver(_resolver) {}

    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        addresses = new bytes32[](1);
        addresses[0] = CONTRACT_FLEXIBLESTORAGE;
    }

    function flexibleStorage() internal view returns (IFlexibleStorage) {
        return IFlexibleStorage(requireAndGetAddress(CONTRACT_FLEXIBLESTORAGE));
    }

    function _getGasLimitSetting(CrossDomainMessageGasLimits gasLimitType) internal pure returns (bytes32) {
        if (gasLimitType == CrossDomainMessageGasLimits.Deposit) {
            return SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Escrow) {
            return SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Reward) {
            return SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Withdrawal) {
            return SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.Relay) {
            return SETTING_CROSS_DOMAIN_RELAY_GAS_LIMIT;
        } else if (gasLimitType == CrossDomainMessageGasLimits.CloseFeePeriod) {
            return SETTING_CROSS_DOMAIN_FEE_PERIOD_CLOSE_GAS_LIMIT;
        } else {
            revert("Unknown gas limit type");
        }
    }

    function getCrossDomainMessageGasLimit(CrossDomainMessageGasLimits gasLimitType) internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, _getGasLimitSetting(gasLimitType));
    }

    function getTradingRewardsEnabled() internal view returns (bool) {
        return flexibleStorage().getBoolValue(SETTING_CONTRACT_NAME, SETTING_TRADING_REWARDS_ENABLED);
    }

    function getWaitingPeriodSecs() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_WAITING_PERIOD_SECS);
    }

    function getPriceDeviationThresholdFactor() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR);
    }

    function getIssuanceRatio() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ISSUANCE_RATIO);
    }

    function getFeePeriodDuration() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_FEE_PERIOD_DURATION);
    }

    function getTargetThreshold() internal view returns (uint) {
        // lookup on flexible storage directly for gas savings (rather than via SystemSettings)
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_TARGET_THRESHOLD);
    }

    function getLiquidationDelay() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_DELAY);
    }

    function getLiquidationRatio() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_RATIO);
    }

    function getLiquidationEscrowDuration() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_ESCROW_DURATION);
    }

    function getLiquidationPenalty() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_PENALTY);
    }

    function getSnxLiquidationPenalty() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_SNX_LIQUIDATION_PENALTY);
    }

    function getSelfLiquidationPenalty() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_SELF_LIQUIDATION_PENALTY);
    }

    function getFlagReward() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_FLAG_REWARD);
    }

    function getLiquidateReward() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATE_REWARD);
    }

    function getRateStalePeriod() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_RATE_STALE_PERIOD);
    }

    /* ========== Exchange Related Fees ========== */
    function getExchangeFeeRate(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_EXCHANGE_FEE_RATE, currencyKey))
            );
    }

    /// @notice Get exchange dynamic fee related keys
    /// @return threshold, weight decay, rounds, and max fee
    function getExchangeDynamicFeeConfig() internal view returns (DynamicFeeConfig memory) {
        bytes32[] memory keys = new bytes32[](4);
        keys[0] = SETTING_EXCHANGE_DYNAMIC_FEE_THRESHOLD;
        keys[1] = SETTING_EXCHANGE_DYNAMIC_FEE_WEIGHT_DECAY;
        keys[2] = SETTING_EXCHANGE_DYNAMIC_FEE_ROUNDS;
        keys[3] = SETTING_EXCHANGE_MAX_DYNAMIC_FEE;
        uint[] memory values = flexibleStorage().getUIntValues(SETTING_CONTRACT_NAME, keys);
        return DynamicFeeConfig({threshold: values[0], weightDecay: values[1], rounds: values[2], maxFee: values[3]});
    }

    /* ========== End Exchange Related Fees ========== */

    function getMinimumStakeTime() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_MINIMUM_STAKE_TIME);
    }

    function getAggregatorWarningFlags() internal view returns (address) {
        return flexibleStorage().getAddressValue(SETTING_CONTRACT_NAME, SETTING_AGGREGATOR_WARNING_FLAGS);
    }

    function getDebtSnapshotStaleTime() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_DEBT_SNAPSHOT_STALE_TIME);
    }

    function getEtherWrapperMaxETH() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_MAX_ETH);
    }

    function getEtherWrapperMintFeeRate() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_MINT_FEE_RATE);
    }

    function getEtherWrapperBurnFeeRate() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ETHER_WRAPPER_BURN_FEE_RATE);
    }

    function getWrapperMaxTokenAmount(address wrapper) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_WRAPPER_MAX_TOKEN_AMOUNT, wrapper))
            );
    }

    function getWrapperMintFeeRate(address wrapper) internal view returns (int) {
        return
            flexibleStorage().getIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_WRAPPER_MINT_FEE_RATE, wrapper))
            );
    }

    function getWrapperBurnFeeRate(address wrapper) internal view returns (int) {
        return
            flexibleStorage().getIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_WRAPPER_BURN_FEE_RATE, wrapper))
            );
    }

    function getInteractionDelay(address collateral) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_INTERACTION_DELAY, collateral))
            );
    }

    function getCollapseFeeRate(address collateral) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_COLLAPSE_FEE_RATE, collateral))
            );
    }

    function getAtomicMaxVolumePerBlock() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ATOMIC_MAX_VOLUME_PER_BLOCK);
    }

    function getAtomicTwapWindow() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ATOMIC_TWAP_WINDOW);
    }

    function getAtomicEquivalentForDexPricing(bytes32 currencyKey) internal view returns (address) {
        return
            flexibleStorage().getAddressValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_EQUIVALENT_FOR_DEX_PRICING, currencyKey))
            );
    }

    function getAtomicExchangeFeeRate(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_EXCHANGE_FEE_RATE, currencyKey))
            );
    }

    function getAtomicVolatilityConsiderationWindow(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW, currencyKey))
            );
    }

    function getAtomicVolatilityUpdateThreshold(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_ATOMIC_VOLATILITY_UPDATE_THRESHOLD, currencyKey))
            );
    }

    function getPureChainlinkPriceForAtomicSwapsEnabled(bytes32 currencyKey) internal view returns (bool) {
        return
            flexibleStorage().getBoolValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_PURE_CHAINLINK_PRICE_FOR_ATOMIC_SWAPS_ENABLED, currencyKey))
            );
    }

    function getCrossChainSynthTransferEnabled(bytes32 currencyKey) internal view returns (uint) {
        return
            flexibleStorage().getUIntValue(
                SETTING_CONTRACT_NAME,
                keccak256(abi.encodePacked(SETTING_CROSS_SYNTH_TRANSFER_ENABLED, currencyKey))
            );
    }

    function getExchangeMaxDynamicFee() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_MAX_DYNAMIC_FEE);
    }

    function getExchangeDynamicFeeRounds() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_ROUNDS);
    }

    function getExchangeDynamicFeeThreshold() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_THRESHOLD);
    }

    function getExchangeDynamicFeeWeightDecay() internal view returns (uint) {
        return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_WEIGHT_DECAY);
    }
}


// https://docs.synthetix.io/contracts/source/interfaces/isystemsettings
interface ISystemSettings {
    // Views
    function waitingPeriodSecs() external view returns (uint);

    function priceDeviationThresholdFactor() external view returns (uint);

    function issuanceRatio() external view returns (uint);

    function feePeriodDuration() external view returns (uint);

    function targetThreshold() external view returns (uint);

    function liquidationDelay() external view returns (uint);

    function liquidationRatio() external view returns (uint);

    function liquidationEscrowDuration() external view returns (uint);

    function liquidationPenalty() external view returns (uint);

    function snxLiquidationPenalty() external view returns (uint);

    function selfLiquidationPenalty() external view returns (uint);

    function flagReward() external view returns (uint);

    function liquidateReward() external view returns (uint);

    function rateStalePeriod() external view returns (uint);

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

    function minimumStakeTime() external view returns (uint);

    function debtSnapshotStaleTime() external view returns (uint);

    function aggregatorWarningFlags() external view returns (address);

    function tradingRewardsEnabled() external view returns (bool);

    function wrapperMaxTokenAmount(address wrapper) external view returns (uint);

    function wrapperMintFeeRate(address wrapper) external view returns (int);

    function wrapperBurnFeeRate(address wrapper) external view returns (int);

    function etherWrapperMaxETH() external view returns (uint);

    function etherWrapperBurnFeeRate() external view returns (uint);

    function etherWrapperMintFeeRate() external view returns (uint);

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

    function atomicMaxVolumePerBlock() external view returns (uint);

    function atomicTwapWindow() external view returns (uint);

    function atomicEquivalentForDexPricing(bytes32 currencyKey) external view returns (address);

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

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

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

    function pureChainlinkPriceForAtomicSwapsEnabled(bytes32 currencyKey) external view returns (bool);
}


/**
 * @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;
    }

    // Computes `a - b`, setting the value to 0 if b > a.
    function floorsub(uint a, uint b) internal pure returns (uint) {
        return b >= a ? 0 : a - b;
    }

    /* ---------- Utilities ---------- */
    /*
     * Absolute value of the input, returned as a signed number.
     */
    function signedAbs(int x) internal pure returns (int) {
        return x < 0 ? -x : x;
    }

    /*
     * Absolute value of the input, returned as an unsigned number.
     */
    function abs(int x) internal pure returns (uint) {
        return uint(signedAbs(x));
    }
}


// Internal references


// Libraries


/// This library is to reduce SystemSettings contract size only and is not really
/// a proper library - so it shares knowledge of implementation details
/// Some of the setters were refactored into this library, and some setters remain in the
/// contract itself (SystemSettings)
library SystemSettingsLib {
    using SafeMath for uint;
    using SafeDecimalMath for uint;

    bytes32 public constant SETTINGS_CONTRACT_NAME = "SystemSettings";

    // No more synths may be issued than the value of SNX backing them.
    uint public constant MAX_ISSUANCE_RATIO = 1e18;

    // The fee period must be between 1 day and 60 days.
    uint public constant MIN_FEE_PERIOD_DURATION = 1 days;
    uint public constant MAX_FEE_PERIOD_DURATION = 60 days;

    uint public constant MAX_TARGET_THRESHOLD = 50;

    uint public constant MAX_LIQUIDATION_RATIO = 1e18; // 100% issuance ratio
    uint public constant RATIO_FROM_TARGET_BUFFER = 2e18; // 200% - mininimum buffer between issuance ratio and liquidation ratio

    uint public constant MAX_LIQUIDATION_PENALTY = 9e18 / 10; // Max 90% liquidation penalty / bonus

    uint public constant MAX_LIQUIDATION_DELAY = 3 days;
    uint public constant MIN_LIQUIDATION_DELAY = 300; // 5 min

    // Exchange fee may not exceed 10%.
    uint public constant MAX_EXCHANGE_FEE_RATE = 1e18 / 10;

    // Minimum Stake time may not exceed 1 weeks.
    uint public constant MAX_MINIMUM_STAKE_TIME = 1 weeks;

    uint public constant MAX_CROSS_DOMAIN_GAS_LIMIT = 12e6;
    uint public constant MIN_CROSS_DOMAIN_GAS_LIMIT = 3e6;

    int public constant MAX_WRAPPER_MINT_FEE_RATE = 1e18;

    int public constant MAX_WRAPPER_BURN_FEE_RATE = 1e18;

    // Atomic block volume limit is encoded as uint192.
    uint public constant MAX_ATOMIC_VOLUME_PER_BLOCK = uint192(-1);

    // TWAP window must be between 1 min and 1 day.
    uint public constant MIN_ATOMIC_TWAP_WINDOW = 60;
    uint public constant MAX_ATOMIC_TWAP_WINDOW = 86400;

    // Volatility consideration window must be between 1 min and 1 day.
    uint public constant MIN_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW = 60;
    uint public constant MAX_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW = 86400;

    // workaround for library not supporting public constants in sol v0.5
    function contractName() external view returns (bytes32) {
        return SETTINGS_CONTRACT_NAME;
    }

    function setCrossDomainMessageGasLimit(
        IFlexibleStorage flexibleStorage,
        bytes32 gasLimitSettings,
        uint crossDomainMessageGasLimit
    ) external {
        require(
            crossDomainMessageGasLimit >= MIN_CROSS_DOMAIN_GAS_LIMIT &&
                crossDomainMessageGasLimit <= MAX_CROSS_DOMAIN_GAS_LIMIT,
            "Out of range xDomain gasLimit"
        );
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, gasLimitSettings, crossDomainMessageGasLimit);
    }

    function setIssuanceRatio(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint ratio
    ) external {
        require(ratio <= MAX_ISSUANCE_RATIO, "New issuance ratio cannot exceed MAX_ISSUANCE_RATIO");
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, ratio);
    }

    function setTradingRewardsEnabled(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        bool _tradingRewardsEnabled
    ) external {
        flexibleStorage.setBoolValue(SETTINGS_CONTRACT_NAME, settingName, _tradingRewardsEnabled);
    }

    function setWaitingPeriodSecs(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _waitingPeriodSecs
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _waitingPeriodSecs);
    }

    function setPriceDeviationThresholdFactor(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _priceDeviationThresholdFactor
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _priceDeviationThresholdFactor);
    }

    function setFeePeriodDuration(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _feePeriodDuration
    ) external {
        require(_feePeriodDuration >= MIN_FEE_PERIOD_DURATION, "value < MIN_FEE_PERIOD_DURATION");
        require(_feePeriodDuration <= MAX_FEE_PERIOD_DURATION, "value > MAX_FEE_PERIOD_DURATION");

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _feePeriodDuration);
    }

    function setTargetThreshold(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint percent
    ) external returns (uint threshold) {
        require(percent <= MAX_TARGET_THRESHOLD, "Threshold too high");
        threshold = percent.mul(SafeDecimalMath.unit()).div(100);

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, threshold);
    }

    function setLiquidationDelay(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint time
    ) external {
        require(time <= MAX_LIQUIDATION_DELAY, "Must be less than MAX_LIQUIDATION_DELAY");
        require(time >= MIN_LIQUIDATION_DELAY, "Must be greater than MIN_LIQUIDATION_DELAY");

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, time);
    }

    function setLiquidationRatio(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _liquidationRatio,
        uint getSnxLiquidationPenalty,
        uint getIssuanceRatio
    ) external {
        require(
            _liquidationRatio <= MAX_LIQUIDATION_RATIO.divideDecimal(SafeDecimalMath.unit().add(getSnxLiquidationPenalty)),
            "liquidationRatio > MAX_LIQUIDATION_RATIO / (1 + penalty)"
        );

        // MIN_LIQUIDATION_RATIO is a product of target issuance ratio * RATIO_FROM_TARGET_BUFFER
        // Ensures that liquidation ratio is set so that there is a buffer between the issuance ratio and liquidation ratio.
        uint MIN_LIQUIDATION_RATIO = getIssuanceRatio.multiplyDecimal(RATIO_FROM_TARGET_BUFFER);
        require(_liquidationRatio >= MIN_LIQUIDATION_RATIO, "liquidationRatio < MIN_LIQUIDATION_RATIO");

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _liquidationRatio);
    }

    function setLiquidationEscrowDuration(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint duration
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, duration);
    }

    function setSnxLiquidationPenalty(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint penalty
    ) external {
        // MAX_LIQUIDATION_PENALTY is enforced on both Collateral and SNX liquidations
        require(penalty <= MAX_LIQUIDATION_PENALTY, "penalty > MAX_LIQUIDATION_PENALTY");

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, penalty);
    }

    function setSelfLiquidationPenalty(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint penalty
    ) external {
        require(penalty <= MAX_LIQUIDATION_PENALTY, "penalty > MAX_LIQUIDATION_PENALTY");

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, penalty);
    }

    function setLiquidationPenalty(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint penalty
    ) external {
        require(penalty <= MAX_LIQUIDATION_PENALTY, "penalty > MAX_LIQUIDATION_PENALTY");

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, penalty);
    }

    function setFlagReward(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint reward
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, reward);
    }

    function setLiquidateReward(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint reward
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, reward);
    }

    function setRateStalePeriod(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint period
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, period);
    }

    function setExchangeFeeRateForSynths(
        IFlexibleStorage flexibleStorage,
        bytes32 settingExchangeFeeRate,
        bytes32[] calldata synthKeys,
        uint256[] calldata exchangeFeeRates
    ) external {
        require(synthKeys.length == exchangeFeeRates.length, "Array lengths dont match");
        for (uint i = 0; i < synthKeys.length; i++) {
            require(exchangeFeeRates[i] <= MAX_EXCHANGE_FEE_RATE, "MAX_EXCHANGE_FEE_RATE exceeded");
            flexibleStorage.setUIntValue(
                SETTINGS_CONTRACT_NAME,
                keccak256(abi.encodePacked(settingExchangeFeeRate, synthKeys[i])),
                exchangeFeeRates[i]
            );
        }
    }

    function setMinimumStakeTime(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _seconds
    ) external {
        require(_seconds <= MAX_MINIMUM_STAKE_TIME, "stake time exceed maximum 1 week");
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _seconds);
    }

    function setDebtSnapshotStaleTime(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _seconds
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _seconds);
    }

    function setAggregatorWarningFlags(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        address _flags
    ) external {
        require(_flags != address(0), "Valid address must be given");
        flexibleStorage.setAddressValue(SETTINGS_CONTRACT_NAME, settingName, _flags);
    }

    function setEtherWrapperMaxETH(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _maxETH
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _maxETH);
    }

    function setEtherWrapperMintFeeRate(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _rate
    ) external {
        require(_rate <= uint(MAX_WRAPPER_MINT_FEE_RATE), "rate > MAX_WRAPPER_MINT_FEE_RATE");
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _rate);
    }

    function setEtherWrapperBurnFeeRate(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _rate
    ) external {
        require(_rate <= uint(MAX_WRAPPER_BURN_FEE_RATE), "rate > MAX_WRAPPER_BURN_FEE_RATE");
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _rate);
    }

    function setWrapperMaxTokenAmount(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        address _wrapper,
        uint _maxTokenAmount
    ) external {
        flexibleStorage.setUIntValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _wrapper)),
            _maxTokenAmount
        );
    }

    function setWrapperMintFeeRate(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        address _wrapper,
        int _rate,
        int getWrapperBurnFeeRate
    ) external {
        require(_rate <= MAX_WRAPPER_MINT_FEE_RATE, "rate > MAX_WRAPPER_MINT_FEE_RATE");
        require(_rate >= -MAX_WRAPPER_MINT_FEE_RATE, "rate < -MAX_WRAPPER_MINT_FEE_RATE");

        // if mint rate is negative, burn fee rate should be positive and at least equal in magnitude
        // otherwise risk of flash loan attack
        if (_rate < 0) {
            require(-_rate <= getWrapperBurnFeeRate, "-rate > wrapperBurnFeeRate");
        }

        flexibleStorage.setIntValue(SETTINGS_CONTRACT_NAME, keccak256(abi.encodePacked(settingName, _wrapper)), _rate);
    }

    function setWrapperBurnFeeRate(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        address _wrapper,
        int _rate,
        int getWrapperMintFeeRate
    ) external {
        require(_rate <= MAX_WRAPPER_BURN_FEE_RATE, "rate > MAX_WRAPPER_BURN_FEE_RATE");
        require(_rate >= -MAX_WRAPPER_BURN_FEE_RATE, "rate < -MAX_WRAPPER_BURN_FEE_RATE");

        // if burn rate is negative, burn fee rate should be negative and at least equal in magnitude
        // otherwise risk of flash loan attack
        if (_rate < 0) {
            require(-_rate <= getWrapperMintFeeRate, "-rate > wrapperMintFeeRate");
        }

        flexibleStorage.setIntValue(SETTINGS_CONTRACT_NAME, keccak256(abi.encodePacked(settingName, _wrapper)), _rate);
    }

    function setInteractionDelay(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        address _collateral,
        uint _interactionDelay
    ) external {
        require(_interactionDelay <= SafeDecimalMath.unit() * 3600, "Max 1 hour");
        flexibleStorage.setUIntValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _collateral)),
            _interactionDelay
        );
    }

    function setCollapseFeeRate(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        address _collateral,
        uint _collapseFeeRate
    ) external {
        flexibleStorage.setUIntValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _collateral)),
            _collapseFeeRate
        );
    }

    function setAtomicMaxVolumePerBlock(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _maxVolume
    ) external {
        require(_maxVolume <= MAX_ATOMIC_VOLUME_PER_BLOCK, "Atomic max volume exceed maximum uint192");
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _maxVolume);
    }

    function setAtomicTwapWindow(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint _window
    ) external {
        require(_window >= MIN_ATOMIC_TWAP_WINDOW, "Atomic twap window under minimum 1 min");
        require(_window <= MAX_ATOMIC_TWAP_WINDOW, "Atomic twap window exceed maximum 1 day");
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, _window);
    }

    function setAtomicEquivalentForDexPricing(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        bytes32 _currencyKey,
        address _equivalent
    ) external {
        require(_equivalent != address(0), "Atomic equivalent is 0 address");
        flexibleStorage.setAddressValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _currencyKey)),
            _equivalent
        );
    }

    function setAtomicExchangeFeeRate(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        bytes32 _currencyKey,
        uint _exchangeFeeRate
    ) external {
        require(_exchangeFeeRate <= MAX_EXCHANGE_FEE_RATE, "MAX_EXCHANGE_FEE_RATE exceeded");
        flexibleStorage.setUIntValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _currencyKey)),
            _exchangeFeeRate
        );
    }

    function setAtomicVolatilityConsiderationWindow(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        bytes32 _currencyKey,
        uint _window
    ) external {
        if (_window != 0) {
            require(
                _window >= MIN_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW,
                "Atomic volatility consideration window under minimum 1 min"
            );
            require(
                _window <= MAX_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW,
                "Atomic volatility consideration window exceed maximum 1 day"
            );
        }
        flexibleStorage.setUIntValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _currencyKey)),
            _window
        );
    }

    function setAtomicVolatilityUpdateThreshold(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        bytes32 _currencyKey,
        uint _threshold
    ) external {
        flexibleStorage.setUIntValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _currencyKey)),
            _threshold
        );
    }

    function setPureChainlinkPriceForAtomicSwapsEnabled(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        bytes32 _currencyKey,
        bool _enabled
    ) external {
        flexibleStorage.setBoolValue(
            SETTINGS_CONTRACT_NAME,
            keccak256(abi.encodePacked(settingName, _currencyKey)),
            _enabled
        );
    }

    function setCrossChainSynthTransferEnabled(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        bytes32 _currencyKey,
        uint _value
    ) external {
        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, keccak256(abi.encodePacked(settingName, _currencyKey)), _value);
    }

    function setExchangeMaxDynamicFee(
        IFlexibleStorage flexibleStorage,
        bytes32 settingName,
        uint maxFee
    ) external {
        require(maxFee != 0, "Max dynamic fee cannot be 0");
        require(maxFee <= MAX_EXCHANGE_FEE_RATE, "MAX_EXCHANGE_FEE_RATE exceeded");

        flexibleStorage.setUIntValue(SETTINGS_CONTRACT_NAME, settingName, maxFee);
    }
}


// Inheritance


// https://docs.synthetix.io/contracts/source/contracts/systemsettings
contract SystemSettings is Owned, MixinSystemSettings, ISystemSettings {
    // SystemSettingsLib is a way to split out the setters to reduce contract size
    using SystemSettingsLib for IFlexibleStorage;

    constructor(address _owner, address _resolver) public Owned(_owner) MixinSystemSettings(_resolver) {
        // SETTING_CONTRACT_NAME is defined for the getters in MixinSystemSettings and
        // SystemSettingsLib.contractName() is a view into SystemSettingsLib of the contract name
        // that's used by the setters. They have to be equal.
        require(SETTING_CONTRACT_NAME == SystemSettingsLib.contractName(), "read and write keys not equal");
    }

    // ========== VIEWS ==========

    // backwards compatibility to having CONTRACT_NAME public constant
    // solhint-disable-next-line func-name-mixedcase
    function CONTRACT_NAME() external view returns (bytes32) {
        return SystemSettingsLib.contractName();
    }

    // SIP-37 Fee Reclamation
    // The number of seconds after an exchange is executed that must be waited
    // before settlement.
    function waitingPeriodSecs() external view returns (uint) {
        return getWaitingPeriodSecs();
    }

    // SIP-65 Decentralized Circuit Breaker
    // The factor amount expressed in decimal format
    // E.g. 3e18 = factor 3, meaning movement up to 3x and above or down to 1/3x and below
    function priceDeviationThresholdFactor() external view returns (uint) {
        return getPriceDeviationThresholdFactor();
    }

    // The raio of collateral
    // Expressed in 18 decimals. So 800% cratio is 100/800 = 0.125 (0.125e18)
    function issuanceRatio() external view returns (uint) {
        return getIssuanceRatio();
    }

    // How long a fee period lasts at a minimum. It is required for
    // anyone to roll over the periods, so they are not guaranteed
    // to roll over at exactly this duration, but the contract enforces
    // that they cannot roll over any quicker than this duration.
    function feePeriodDuration() external view returns (uint) {
        return getFeePeriodDuration();
    }

    // Users are unable to claim fees if their collateralisation ratio drifts out of target threshold
    function targetThreshold() external view returns (uint) {
        return getTargetThreshold();
    }

    // SIP-15 Liquidations
    // liquidation time delay after address flagged (seconds)
    function liquidationDelay() external view returns (uint) {
        return getLiquidationDelay();
    }

    // SIP-15 Liquidations
    // issuance ratio when account can be flagged for liquidation (with 18 decimals), e.g 0.5 issuance ratio
    // when flag means 1/0.5 = 200% cratio
    function liquidationRatio() external view returns (uint) {
        return getLiquidationRatio();
    }

    // SIP-97 Liquidations
    // penalty taken away from target of Collateral liquidation (with 18 decimals). E.g. 10% is 0.1e18
    function liquidationPenalty() external view returns (uint) {
        return getLiquidationPenalty();
    }

    // SIP-251 Differentiate Liquidation Penalties
    // penalty taken away from target of SNX liquidation (with 18 decimals). E.g. 30% is 0.3e18
    function snxLiquidationPenalty() external view returns (uint) {
        return getSnxLiquidationPenalty();
    }

    /* ========== SIP-148: Upgrade Liquidation Mechanism ========== */

    /// @notice Get the escrow duration for liquidation rewards
    /// @return The escrow duration for liquidation rewards
    function liquidationEscrowDuration() external view returns (uint) {
        return getLiquidationEscrowDuration();
    }

    /// @notice Get the penalty for self liquidation
    /// @return The self liquidation penalty
    function selfLiquidationPenalty() external view returns (uint) {
        return getSelfLiquidationPenalty();
    }

    /// @notice Get the reward for flagging an account for liquidation
    /// @return The reward for flagging an account
    function flagReward() external view returns (uint) {
        return getFlagReward();
    }

    /// @notice Get the reward for liquidating an account
    /// @return The reward for performing a forced liquidation
    function liquidateReward() external view returns (uint) {
        return getLiquidateReward();
    }

    /* ========== End SIP-148 ========== */

    // How long will the ExchangeRates contract assume the rate of any asset is correct
    function rateStalePeriod() external view returns (uint) {
        return getRateStalePeriod();
    }

    /* ========== Exchange Related Fees ========== */
    function exchangeFeeRate(bytes32 currencyKey) external view returns (uint) {
        return getExchangeFeeRate(currencyKey);
    }

    // SIP-184 Dynamic Fee
    /// @notice Get the dynamic fee threshold
    /// @return The dynamic fee threshold
    function exchangeDynamicFeeThreshold() external view returns (uint) {
        return getExchangeDynamicFeeConfig().threshold;
    }

    /// @notice Get the dynamic fee weight decay per round
    /// @return The dynamic fee weight decay per round
    function exchangeDynamicFeeWeightDecay() external view returns (uint) {
        return getExchangeDynamicFeeConfig().weightDecay;
    }

    /// @notice Get the dynamic fee total rounds for calculation
    /// @return The dynamic fee total rounds for calculation
    function exchangeDynamicFeeRounds() external view returns (uint) {
        return getExchangeDynamicFeeConfig().rounds;
    }

    /// @notice Get the max dynamic fee
    /// @return The max dynamic fee
    function exchangeMaxDynamicFee() external view returns (uint) {
        return getExchangeDynamicFeeConfig().maxFee;
    }

    /* ========== End Exchange Related Fees ========== */

    function minimumStakeTime() external view returns (uint) {
        return getMinimumStakeTime();
    }

    function debtSnapshotStaleTime() external view returns (uint) {
        return getDebtSnapshotStaleTime();
    }

    function aggregatorWarningFlags() external view returns (address) {
        return getAggregatorWarningFlags();
    }

    // SIP-63 Trading incentives
    // determines if Exchanger records fee entries in TradingRewards
    function tradingRewardsEnabled() external view returns (bool) {
        return getTradingRewardsEnabled();
    }

    function crossDomainMessageGasLimit(CrossDomainMessageGasLimits gasLimitType) external view returns (uint) {
        return getCrossDomainMessageGasLimit(gasLimitType);
    }

    // SIP 112: ETH Wrappr
    // The maximum amount of ETH held by the EtherWrapper.
    function etherWrapperMaxETH() external view returns (uint) {
        return getEtherWrapperMaxETH();
    }

    // SIP 112: ETH Wrappr
    // The fee for depositing ETH into the EtherWrapper.
    function etherWrapperMintFeeRate() external view returns (uint) {
        return getEtherWrapperMintFeeRate();
    }

    // SIP 112: ETH Wrappr
    // The fee for burning sETH and releasing ETH from the EtherWrapper.
    function etherWrapperBurnFeeRate() external view returns (uint) {
        return getEtherWrapperBurnFeeRate();
    }

    // SIP 182: Wrapper Factory
    // The maximum amount of token held by the Wrapper.
    function wrapperMaxTokenAmount(address wrapper) external view returns (uint) {
        return getWrapperMaxTokenAmount(wrapper);
    }

    // SIP 182: Wrapper Factory
    // The fee for depositing token into the Wrapper.
    function wrapperMintFeeRate(address wrapper) external view returns (int) {
        return getWrapperMintFeeRate(wrapper);
    }

    // SIP 182: Wrapper Factory
    // The fee for burning synth and releasing token from the Wrapper.
    function wrapperBurnFeeRate(address wrapper) external view returns (int) {
        return getWrapperBurnFeeRate(wrapper);
    }

    function interactionDelay(address collateral) external view returns (uint) {
        return getInteractionDelay(collateral);
    }

    function collapseFeeRate(address collateral) external view returns (uint) {
        return getCollapseFeeRate(collateral);
    }

    // SIP-120 Atomic exchanges
    // max allowed volume per block for atomic exchanges
    function atomicMaxVolumePerBlock() external view returns (uint) {
        return getAtomicMaxVolumePerBlock();
    }

    // SIP-120 Atomic exchanges
    // time window (in seconds) for TWAP prices when considered for atomic exchanges
    function atomicTwapWindow() external view returns (uint) {
        return getAtomicTwapWindow();
    }

    // SIP-120 Atomic exchanges
    // equivalent asset to use for a synth when considering external prices for atomic exchanges
    function atomicEquivalentForDexPricing(bytes32 currencyKey) external view returns (address) {
        return getAtomicEquivalentForDexPricing(currencyKey);
    }

    // SIP-120 Atomic exchanges
    // fee rate override for atomic exchanges into a synth
    function atomicExchangeFeeRate(bytes32 currencyKey) external view returns (uint) {
        return getAtomicExchangeFeeRate(currencyKey);
    }

    // SIP-120 Atomic exchanges
    // consideration window for determining synth volatility
    function atomicVolatilityConsiderationWindow(bytes32 currencyKey) external view returns (uint) {
        return getAtomicVolatilityConsiderationWindow(currencyKey);
    }

    // SIP-120 Atomic exchanges
    // update threshold for determining synth volatility
    function atomicVolatilityUpdateThreshold(bytes32 currencyKey) external view returns (uint) {
        return getAtomicVolatilityUpdateThreshold(currencyKey);
    }

    // SIP-198: Atomic Exchange At Pure Chainlink Price
    // Whether to use the pure Chainlink price for a given currency key
    function pureChainlinkPriceForAtomicSwapsEnabled(bytes32 currencyKey) external view returns (bool) {
        return getPureChainlinkPriceForAtomicSwapsEnabled(currencyKey);
    }

    // SIP-229 Atomic exchanges
    // enable/disable sending of synths cross chain
    function crossChainSynthTransferEnabled(bytes32 currencyKey) external view returns (uint) {
        return getCrossChainSynthTransferEnabled(currencyKey);
    }

    // ========== RESTRICTED ==========

    function setCrossDomainMessageGasLimit(CrossDomainMessageGasLimits _gasLimitType, uint _crossDomainMessageGasLimit)
        external
        onlyOwner
    {
        flexibleStorage().setCrossDomainMessageGasLimit(_getGasLimitSetting(_gasLimitType), _crossDomainMessageGasLimit);
        emit CrossDomainMessageGasLimitChanged(_gasLimitType, _crossDomainMessageGasLimit);
    }

    function setIssuanceRatio(uint ratio) external onlyOwner {
        flexibleStorage().setIssuanceRatio(SETTING_ISSUANCE_RATIO, ratio);
        emit IssuanceRatioUpdated(ratio);
    }

    function setTradingRewardsEnabled(bool _tradingRewardsEnabled) external onlyOwner {
        flexibleStorage().setTradingRewardsEnabled(SETTING_TRADING_REWARDS_ENABLED, _tradingRewardsEnabled);
        emit TradingRewardsEnabled(_tradingRewardsEnabled);
    }

    function setWaitingPeriodSecs(uint _waitingPeriodSecs) external onlyOwner {
        flexibleStorage().setWaitingPeriodSecs(SETTING_WAITING_PERIOD_SECS, _waitingPeriodSecs);
        emit WaitingPeriodSecsUpdated(_waitingPeriodSecs);
    }

    function setPriceDeviationThresholdFactor(uint _priceDeviationThresholdFactor) external onlyOwner {
        flexibleStorage().setPriceDeviationThresholdFactor(
            SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR,
            _priceDeviationThresholdFactor
        );
        emit PriceDeviationThresholdUpdated(_priceDeviationThresholdFactor);
    }

    function setFeePeriodDuration(uint _feePeriodDuration) external onlyOwner {
        flexibleStorage().setFeePeriodDuration(SETTING_FEE_PERIOD_DURATION, _feePeriodDuration);
        emit FeePeriodDurationUpdated(_feePeriodDuration);
    }

    function setTargetThreshold(uint percent) external onlyOwner {
        uint threshold = flexibleStorage().setTargetThreshold(SETTING_TARGET_THRESHOLD, percent);
        emit TargetThresholdUpdated(threshold);
    }

    function setLiquidationDelay(uint time) external onlyOwner {
        flexibleStorage().setLiquidationDelay(SETTING_LIQUIDATION_DELAY, time);
        emit LiquidationDelayUpdated(time);
    }

    // The collateral / issuance ratio ( debt / collateral ) is higher when there is less collateral backing their debt
    // Upper bound liquidationRatio is 1 + penalty (100% + 10% = 110%) to allow collateral value to cover debt and liquidation penalty
    function setLiquidationRatio(uint _liquidationRatio) external onlyOwner {
        flexibleStorage().setLiquidationRatio(
            SETTING_LIQUIDATION_RATIO,
            _liquidationRatio,
            getSnxLiquidationPenalty(),
            getIssuanceRatio()
        );
        emit LiquidationRatioUpdated(_liquidationRatio);
    }

    function setLiquidationEscrowDuration(uint duration) external onlyOwner {
        flexibleStorage().setUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_ESCROW_DURATION, duration);
        emit LiquidationEscrowDurationUpdated(duration);
    }

    function setSnxLiquidationPenalty(uint penalty) external onlyOwner {
        flexibleStorage().setSnxLiquidationPenalty(SETTING_SNX_LIQUIDATION_PENALTY, penalty);
        emit SnxLiquidationPenaltyUpdated(penalty);
    }

    function setLiquidationPenalty(uint penalty) external onlyOwner {
        flexibleStorage().setLiquidationPenalty(SETTING_LIQUIDATION_PENALTY, penalty);
        emit LiquidationPenaltyUpdated(penalty);
    }

    function setSelfLiquidationPenalty(uint penalty) external onlyOwner {
        flexibleStorage().setSelfLiquidationPenalty(SETTING_SELF_LIQUIDATION_PENALTY, penalty);
        emit SelfLiquidationPenaltyUpdated(penalty);
    }

    function setFlagReward(uint reward) external onlyOwner {
        flexibleStorage().setUIntValue(SETTING_CONTRACT_NAME, SETTING_FLAG_REWARD, reward);
        emit FlagRewardUpdated(reward);
    }

    function setLiquidateReward(uint reward) external onlyOwner {
        flexibleStorage().setUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATE_REWARD, reward);
        emit LiquidateRewardUpdated(reward);
    }

    function setRateStalePeriod(uint period) external onlyOwner {
        flexibleStorage().setRateStalePeriod(SETTING_RATE_STALE_PERIOD, period);
        emit RateStalePeriodUpdated(period);
    }

    /* ========== Exchange Fees Related ========== */
    function setExchangeFeeRateForSynths(bytes32[] calldata synthKeys, uint256[] calldata exchangeFeeRates)
        external
        onlyOwner
    {
        flexibleStorage().setExchangeFeeRateForSynths(SETTING_EXCHANGE_FEE_RATE, synthKeys, exchangeFeeRates);
        for (uint i = 0; i < synthKeys.length; i++) {
            emit ExchangeFeeUpdated(synthKeys[i], exchangeFeeRates[i]);
        }
    }

    /// @notice Set exchange dynamic fee threshold constant in decimal ratio
    /// @param threshold The exchange dynamic fee threshold
    /// @return uint threshold constant
    function setExchangeDynamicFeeThreshold(uint threshold) external onlyOwner {
        require(threshold != 0, "Threshold cannot be 0");

        flexibleStorage().setUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_THRESHOLD, threshold);

        emit ExchangeDynamicFeeThresholdUpdated(threshold);
    }

    /// @notice Set exchange dynamic fee weight decay constant
    /// @param weightDecay The exchange dynamic fee weight decay
    /// @return uint weight decay constant
    function setExchangeDynamicFeeWeightDecay(uint weightDecay) external onlyOwner {
        require(weightDecay != 0, "Weight decay cannot be 0");

        flexibleStorage().setUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_WEIGHT_DECAY, weightDecay);

        emit ExchangeDynamicFeeWeightDecayUpdated(weightDecay);
    }

    /// @notice Set exchange dynamic fee last N rounds with minimum 2 rounds
    /// @param rounds The exchange dynamic fee last N rounds
    /// @return uint dynamic fee last N rounds
    function setExchangeDynamicFeeRounds(uint rounds) external onlyOwner {
        flexibleStorage().setUIntValue(SETTING_CONTRACT_NAME, SETTING_EXCHANGE_DYNAMIC_FEE_ROUNDS, rounds);

        emit ExchangeDynamicFeeRoundsUpdated(rounds);
    }

    /// @notice Set max exchange dynamic fee
    /// @param maxFee The max exchange dynamic fee
    /// @return uint dynamic fee last N rounds
    function setExchangeMaxDynamicFee(uint maxFee) external onlyOwner {
        flexibleStorage().setExchangeMaxDynamicFee(SETTING_EXCHANGE_MAX_DYNAMIC_FEE, maxFee);
        emit ExchangeMaxDynamicFeeUpdated(maxFee);
    }

    function setMinimumStakeTime(uint _seconds) external onlyOwner {
        flexibleStorage().setMinimumStakeTime(SETTING_MINIMUM_STAKE_TIME, _seconds);
        emit MinimumStakeTimeUpdated(_seconds);
    }

    function setDebtSnapshotStaleTime(uint _seconds) external onlyOwner {
        flexibleStorage().setDebtSnapshotStaleTime(SETTING_DEBT_SNAPSHOT_STALE_TIME, _seconds);
        emit DebtSnapshotStaleTimeUpdated(_seconds);
    }

    function setAggregatorWarningFlags(address _flags) external onlyOwner {
        flexibleStorage().setAggregatorWarningFlags(SETTING_AGGREGATOR_WARNING_FLAGS, _flags);
        emit AggregatorWarningFlagsUpdated(_flags);
    }

    function setEtherWrapperMaxETH(uint _maxETH) external onlyOwner {
        flexibleStorage().setEtherWrapperMaxETH(SETTING_ETHER_WRAPPER_MAX_ETH, _maxETH);
        emit EtherWrapperMaxETHUpdated(_maxETH);
    }

    function setEtherWrapperMintFeeRate(uint _rate) external onlyOwner {
        flexibleStorage().setEtherWrapperMintFeeRate(SETTING_ETHER_WRAPPER_MINT_FEE_RATE, _rate);
        emit EtherWrapperMintFeeRateUpdated(_rate);
    }

    function setEtherWrapperBurnFeeRate(uint _rate) external onlyOwner {
        flexibleStorage().setEtherWrapperBurnFeeRate(SETTING_ETHER_WRAPPER_BURN_FEE_RATE, _rate);
        emit EtherWrapperBurnFeeRateUpdated(_rate);
    }

    function setWrapperMaxTokenAmount(address _wrapper, uint _maxTokenAmount) external onlyOwner {
        flexibleStorage().setWrapperMaxTokenAmount(SETTING_WRAPPER_MAX_TOKEN_AMOUNT, _wrapper, _maxTokenAmount);
        emit WrapperMaxTokenAmountUpdated(_wrapper, _maxTokenAmount);
    }

    function setWrapperMintFeeRate(address _wrapper, int _rate) external onlyOwner {
        flexibleStorage().setWrapperMintFeeRate(
            SETTING_WRAPPER_MINT_FEE_RATE,
            _wrapper,
            _rate,
            getWrapperBurnFeeRate(_wrapper)
        );
        emit WrapperMintFeeRateUpdated(_wrapper, _rate);
    }

    function setWrapperBurnFeeRate(address _wrapper, int _rate) external onlyOwner {
        flexibleStorage().setWrapperBurnFeeRate(
            SETTING_WRAPPER_BURN_FEE_RATE,
            _wrapper,
            _rate,
            getWrapperMintFeeRate(_wrapper)
        );
        emit WrapperBurnFeeRateUpdated(_wrapper, _rate);
    }

    function setInteractionDelay(address _collateral, uint _interactionDelay) external onlyOwner {
        flexibleStorage().setInteractionDelay(SETTING_INTERACTION_DELAY, _collateral, _interactionDelay);
        emit InteractionDelayUpdated(_interactionDelay);
    }

    function setCollapseFeeRate(address _collateral, uint _collapseFeeRate) external onlyOwner {
        flexibleStorage().setCollapseFeeRate(SETTING_COLLAPSE_FEE_RATE, _collateral, _collapseFeeRate);
        emit CollapseFeeRateUpdated(_collapseFeeRate);
    }

    function setAtomicMaxVolumePerBlock(uint _maxVolume) external onlyOwner {
        flexibleStorage().setAtomicMaxVolumePerBlock(SETTING_ATOMIC_MAX_VOLUME_PER_BLOCK, _maxVolume);
        emit AtomicMaxVolumePerBlockUpdated(_maxVolume);
    }

    function setAtomicTwapWindow(uint _window) external onlyOwner {
        flexibleStorage().setAtomicTwapWindow(SETTING_ATOMIC_TWAP_WINDOW, _window);
        emit AtomicTwapWindowUpdated(_window);
    }

    function setAtomicEquivalentForDexPricing(bytes32 _currencyKey, address _equivalent) external onlyOwner {
        flexibleStorage().setAtomicEquivalentForDexPricing(
            SETTING_ATOMIC_EQUIVALENT_FOR_DEX_PRICING,
            _currencyKey,
            _equivalent
        );
        emit AtomicEquivalentForDexPricingUpdated(_currencyKey, _equivalent);
    }

    function setAtomicExchangeFeeRate(bytes32 _currencyKey, uint256 _exchangeFeeRate) external onlyOwner {
        flexibleStorage().setAtomicExchangeFeeRate(SETTING_ATOMIC_EXCHANGE_FEE_RATE, _currencyKey, _exchangeFeeRate);
        emit AtomicExchangeFeeUpdated(_currencyKey, _exchangeFeeRate);
    }

    function setAtomicVolatilityConsiderationWindow(bytes32 _currencyKey, uint _window) external onlyOwner {
        flexibleStorage().setAtomicVolatilityConsiderationWindow(
            SETTING_ATOMIC_VOLATILITY_CONSIDERATION_WINDOW,
            _currencyKey,
            _window
        );
        emit AtomicVolatilityConsiderationWindowUpdated(_currencyKey, _window);
    }

    function setAtomicVolatilityUpdateThreshold(bytes32 _currencyKey, uint _threshold) external onlyOwner {
        flexibleStorage().setAtomicVolatilityUpdateThreshold(
            SETTING_ATOMIC_VOLATILITY_UPDATE_THRESHOLD,
            _currencyKey,
            _threshold
        );
        emit AtomicVolatilityUpdateThresholdUpdated(_currencyKey, _threshold);
    }

    function setPureChainlinkPriceForAtomicSwapsEnabled(bytes32 _currencyKey, bool _enabled) external onlyOwner {
        flexibleStorage().setPureChainlinkPriceForAtomicSwapsEnabled(
            SETTING_PURE_CHAINLINK_PRICE_FOR_ATOMIC_SWAPS_ENABLED,
            _currencyKey,
            _enabled
        );
        emit PureChainlinkPriceForAtomicSwapsEnabledUpdated(_currencyKey, _enabled);
    }

    function setCrossChainSynthTransferEnabled(bytes32 _currencyKey, uint _value) external onlyOwner {
        flexibleStorage().setCrossChainSynthTransferEnabled(SETTING_CROSS_SYNTH_TRANSFER_ENABLED, _currencyKey, _value);
        emit CrossChainSynthTransferEnabledUpdated(_currencyKey, _value);
    }

    // ========== EVENTS ==========
    event CrossDomainMessageGasLimitChanged(CrossDomainMessageGasLimits gasLimitType, uint newLimit);
    event IssuanceRatioUpdated(uint newRatio);
    event TradingRewardsEnabled(bool enabled);
    event WaitingPeriodSecsUpdated(uint waitingPeriodSecs);
    event PriceDeviationThresholdUpdated(uint threshold);
    event FeePeriodDurationUpdated(uint newFeePeriodDuration);
    event TargetThresholdUpdated(uint newTargetThreshold);
    event LiquidationDelayUpdated(uint newDelay);
    event LiquidationRatioUpdated(uint newRatio);
    event LiquidationEscrowDurationUpdated(uint newDuration);
    event LiquidationPenaltyUpdated(uint newPenalty);
    event SnxLiquidationPenaltyUpdated(uint newPenalty);
    event SelfLiquidationPenaltyUpdated(uint newPenalty);
    event FlagRewardUpdated(uint newReward);
    event LiquidateRewardUpdated(uint newReward);
    event RateStalePeriodUpdated(uint rateStalePeriod);
    /* ========== Exchange Fees Related ========== */
    event ExchangeFeeUpdated(bytes32 synthKey, uint newExchangeFeeRate);
    event ExchangeDynamicFeeThresholdUpdated(uint dynamicFeeThreshold);
    event ExchangeDynamicFeeWeightDecayUpdated(uint dynamicFeeWeightDecay);
    event ExchangeDynamicFeeRoundsUpdated(uint dynamicFeeRounds);
    event ExchangeMaxDynamicFeeUpdated(uint maxDynamicFee);
    /* ========== End Exchange Fees Related ========== */
    event MinimumStakeTimeUpdated(uint minimumStakeTime);
    event DebtSnapshotStaleTimeUpdated(uint debtSnapshotStaleTime);
    event AggregatorWarningFlagsUpdated(address flags);
    event EtherWrapperMaxETHUpdated(uint maxETH);
    event EtherWrapperMintFeeRateUpdated(uint rate);
    event EtherWrapperBurnFeeRateUpdated(uint rate);
    event WrapperMaxTokenAmountUpdated(address wrapper, uint maxTokenAmount);
    event WrapperMintFeeRateUpdated(address wrapper, int rate);
    event WrapperBurnFeeRateUpdated(address wrapper, int rate);
    event InteractionDelayUpdated(uint interactionDelay);
    event CollapseFeeRateUpdated(uint collapseFeeRate);
    event AtomicMaxVolumePerBlockUpdated(uint newMaxVolume);
    event AtomicTwapWindowUpdated(uint newWindow);
    event AtomicEquivalentForDexPricingUpdated(bytes32 synthKey, address equivalent);
    event AtomicExchangeFeeUpdated(bytes32 synthKey, uint newExchangeFeeRate);
    event AtomicVolatilityConsiderationWindowUpdated(bytes32 synthKey, uint newVolatilityConsiderationWindow);
    event AtomicVolatilityUpdateThresholdUpdated(bytes32 synthKey, uint newVolatilityUpdateThreshold);
    event PureChainlinkPriceForAtomicSwapsEnabledUpdated(bytes32 synthKey, bool enabled);
    event CrossChainSynthTransferEnabledUpdated(bytes32 synthKey, uint value);
}

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00000000000000000000000048914229dedd5a9922f44441ffccfc2cb7856ee900000000000000000000000058719e8ef4d201541e44505a2acb3424481d6681

-----Decoded View---------------
Arg [0] : _owner (address): 0x48914229deDd5A9922f44441ffCCfC2Cb7856Ee9
Arg [1] : _resolver (address): 0x58719E8Ef4d201541e44505a2ACB3424481d6681

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000048914229dedd5a9922f44441ffccfc2cb7856ee9
Arg [1] : 00000000000000000000000058719e8ef4d201541e44505a2acb3424481d6681

SafeDecimalMath : 0xb6a200136891be1c881431320e4092953788c7e0
SystemSettingsLib : 0x52c339d07e82d49073f6b85ab033599e0eb644f9
SignedSafeDecimalMath : 0xbfe5da86981e2db461bd85d31795ad233748ee32
ExchangeSettlementLib : 0xa4d8e25579fc765ff1963dd37132061599c61689