Contract 0x53baE964339e8A742B5b47F6C10bbfa8Ff138F34

/**
 *Submitted for verification at Etherscan.io on 2020-12-23
*/

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

* Synthetix: CollateralManager.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/CollateralManager.sol
* Docs: https://docs.synthetix.io/contracts/CollateralManager
*
* Contract Dependencies: 
*	- IAddressResolver
*	- ICollateralManager
*	- MixinResolver
*	- Owned
*	- Pausable
*	- State
* Libraries: 
*	- AddressSetLib
*	- Bytes32SetLib
*	- SafeDecimalMath
*	- SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2020 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);
}


// Inheritance


// https://docs.synthetix.io/contracts/source/contracts/pausable
contract Pausable is Owned {
    uint public lastPauseTime;
    bool public paused;

    constructor() internal {
        // This contract is abstract, and thus cannot be instantiated directly
        require(owner != address(0), "Owner must be set");
        // Paused will be false, and lastPauseTime will be 0 upon initialisation
    }

    /**
     * @notice Change the paused state of the contract
     * @dev Only the contract owner may call this.
     */
    function setPaused(bool _paused) external onlyOwner {
        // Ensure we're actually changing the state before we do anything
        if (_paused == paused) {
            return;
        }

        // Set our paused state.
        paused = _paused;

        // If applicable, set the last pause time.
        if (paused) {
            lastPauseTime = now;
        }

        // Let everyone know that our pause state has changed.
        emit PauseChanged(paused);
    }

    event PauseChanged(bool isPaused);

    modifier notPaused {
        require(!paused, "This action cannot be performed while the contract is paused");
        _;
    }
}


// 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);
}


interface ICollateralManager {
    // Manager information
    function hasCollateral(address collateral) external view returns (bool);

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

    // State information
    function long(bytes32 synth) external view returns (uint amount);

    function short(bytes32 synth) external view returns (uint amount);

    function totalLong() external view returns (uint susdValue, bool anyRateIsInvalid);

    function totalShort() external view returns (uint susdValue, bool anyRateIsInvalid);

    function getBorrowRate() external view returns (uint borrowRate, bool anyRateIsInvalid);

    function getShortRate(bytes32 synth) external view returns (uint shortRate, bool rateIsInvalid);

    function getRatesAndTime(uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        );

    function getShortRatesAndTime(bytes32 currency, uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        );

    function exceedsDebtLimit(uint amount, bytes32 currency) external view returns (bool canIssue, bool anyRateIsInvalid);

    function areSynthsAndCurrenciesSet(bytes32[] calldata requiredSynthNamesInResolver, bytes32[] calldata synthKeys)
        external
        view
        returns (bool);

    function areShortableSynthsSet(bytes32[] calldata requiredSynthNamesInResolver, bytes32[] calldata synthKeys)
        external
        view
        returns (bool);

    // Loans
    function getNewLoanId() external returns (uint id);

    // Manager mutative
    function addCollaterals(address[] calldata collaterals) external;

    function removeCollaterals(address[] calldata collaterals) external;

    function addSynths(bytes32[] calldata synthNamesInResolver, bytes32[] calldata synthKeys) external;

    function removeSynths(bytes32[] calldata synths, bytes32[] calldata synthKeys) external;

    function addShortableSynths(bytes32[2][] calldata requiredSynthAndInverseNamesInResolver, bytes32[] calldata synthKeys)
        external;

    function removeShortableSynths(bytes32[] calldata synths) external;

    // State mutative
    function updateBorrowRates(uint rate) external;

    function updateShortRates(bytes32 currency, uint rate) external;

    function incrementLongs(bytes32 synth, uint amount) external;

    function decrementLongs(bytes32 synth, uint amount) external;

    function incrementShorts(bytes32 synth, uint amount) external;

    function decrementShorts(bytes32 synth, uint amount) external;
}


// https://docs.synthetix.io/contracts/source/libraries/addresssetlib/
library AddressSetLib {
    struct AddressSet {
        address[] elements;
        mapping(address => uint) indices;
    }

    function contains(AddressSet storage set, address candidate) internal view returns (bool) {
        if (set.elements.length == 0) {
            return false;
        }
        uint index = set.indices[candidate];
        return index != 0 || set.elements[0] == candidate;
    }

    function getPage(
        AddressSet storage set,
        uint index,
        uint pageSize
    ) internal view returns (address[] memory) {
        // NOTE: This implementation should be converted to slice operators if the compiler is updated to v0.6.0+
        uint endIndex = index + pageSize; // The check below that endIndex <= index handles overflow.

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

        uint n = endIndex - index; // We already checked for negative overflow.
        address[] memory page = new address[](n);
        for (uint i; i < n; i++) {
            page[i] = set.elements[i + index];
        }
        return page;
    }

    function add(AddressSet storage set, address element) internal {
        // Adding to a set is an idempotent operation.
        if (!contains(set, element)) {
            set.indices[element] = set.elements.length;
            set.elements.push(element);
        }
    }

    function remove(AddressSet storage set, address element) internal {
        require(contains(set, element), "Element not in set.");
        // Replace the removed element with the last element of the list.
        uint index = set.indices[element];
        uint lastIndex = set.elements.length - 1; // We required that element is in the list, so it is not empty.
        if (index != lastIndex) {
            // No need to shift the last element if it is the one we want to delete.
            address shiftedElement = set.elements[lastIndex];
            set.elements[index] = shiftedElement;
            set.indices[shiftedElement] = index;
        }
        set.elements.pop();
        delete set.indices[element];
    }
}


// https://docs.synthetix.io/contracts/source/libraries/bytes32setlib/
library Bytes32SetLib {
    struct Bytes32Set {
        bytes32[] elements;
        mapping(bytes32 => uint) indices;
    }

    function contains(Bytes32Set storage set, bytes32 candidate) internal view returns (bool) {
        if (set.elements.length == 0) {
            return false;
        }
        uint index = set.indices[candidate];
        return index != 0 || set.elements[0] == candidate;
    }

    function getPage(
        Bytes32Set storage set,
        uint index,
        uint pageSize
    ) internal view returns (bytes32[] memory) {
        // NOTE: This implementation should be converted to slice operators if the compiler is updated to v0.6.0+
        uint endIndex = index + pageSize; // The check below that endIndex <= index handles overflow.

        // If the page extends past the end of the list, truncate it.
        if (endIndex > set.elements.length) {
            endIndex = set.elements.length;
        }
        if (endIndex <= index) {
            return new bytes32[](0);
        }

        uint n = endIndex - index; // We already checked for negative overflow.
        bytes32[] memory page = new bytes32[](n);
        for (uint i; i < n; i++) {
            page[i] = set.elements[i + index];
        }
        return page;
    }

    function add(Bytes32Set storage set, bytes32 element) internal {
        // Adding to a set is an idempotent operation.
        if (!contains(set, element)) {
            set.indices[element] = set.elements.length;
            set.elements.push(element);
        }
    }

    function remove(Bytes32Set storage set, bytes32 element) internal {
        require(contains(set, element), "Element not in set.");
        // Replace the removed element with the last element of the list.
        uint index = set.indices[element];
        uint lastIndex = set.elements.length - 1; // We required that element is in the list, so it is not empty.
        if (index != lastIndex) {
            // No need to shift the last element if it is the one we want to delete.
            bytes32 shiftedElement = set.elements[lastIndex];
            set.elements[index] = shiftedElement;
            set.indices[shiftedElement] = index;
        }
        set.elements.pop();
        delete set.indices[element];
    }
}


/**
 * @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;
    }
}


// Inheritance


// https://docs.synthetix.io/contracts/source/contracts/state
contract State is Owned {
    // the address of the contract that can modify variables
    // this can only be changed by the owner of this contract
    address public associatedContract;

    constructor(address _associatedContract) internal {
        // This contract is abstract, and thus cannot be instantiated directly
        require(owner != address(0), "Owner must be set");

        associatedContract = _associatedContract;
        emit AssociatedContractUpdated(_associatedContract);
    }

    /* ========== SETTERS ========== */

    // Change the associated contract to a new address
    function setAssociatedContract(address _associatedContract) external onlyOwner {
        associatedContract = _associatedContract;
        emit AssociatedContractUpdated(_associatedContract);
    }

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

    modifier onlyAssociatedContract {
        require(msg.sender == associatedContract, "Only the associated contract can perform this action");
        _;
    }

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

    event AssociatedContractUpdated(address associatedContract);
}


pragma experimental ABIEncoderV2;

// Inheritance


// Libraries


contract CollateralManagerState is Owned, State {
    using SafeMath for uint;
    using SafeDecimalMath for uint;

    struct Balance {
        uint long;
        uint short;
    }

    uint public totalLoans;

    uint[] public borrowRates;
    uint public borrowRatesLastUpdated;

    mapping(bytes32 => uint[]) public shortRates;
    mapping(bytes32 => uint) public shortRatesLastUpdated;

    // The total amount of long and short for a synth,
    mapping(bytes32 => Balance) public totalIssuedSynths;

    constructor(address _owner, address _associatedContract) public Owned(_owner) State(_associatedContract) {
        borrowRates.push(0);
        borrowRatesLastUpdated = block.timestamp;
    }

    function incrementTotalLoans() external onlyAssociatedContract returns (uint) {
        totalLoans = totalLoans.add(1);
        return totalLoans;
    }

    function long(bytes32 synth) external view onlyAssociatedContract returns (uint) {
        return totalIssuedSynths[synth].long;
    }

    function short(bytes32 synth) external view onlyAssociatedContract returns (uint) {
        return totalIssuedSynths[synth].short;
    }

    function incrementLongs(bytes32 synth, uint256 amount) external onlyAssociatedContract {
        totalIssuedSynths[synth].long = totalIssuedSynths[synth].long.add(amount);
    }

    function decrementLongs(bytes32 synth, uint256 amount) external onlyAssociatedContract {
        totalIssuedSynths[synth].long = totalIssuedSynths[synth].long.sub(amount);
    }

    function incrementShorts(bytes32 synth, uint256 amount) external onlyAssociatedContract {
        totalIssuedSynths[synth].short = totalIssuedSynths[synth].short.add(amount);
    }

    function decrementShorts(bytes32 synth, uint256 amount) external onlyAssociatedContract {
        totalIssuedSynths[synth].short = totalIssuedSynths[synth].short.sub(amount);
    }

    // Borrow rates, one array here for all currencies.

    function getRateAt(uint index) public view returns (uint) {
        return borrowRates[index];
    }

    function getRatesLength() public view returns (uint) {
        return borrowRates.length;
    }

    function updateBorrowRates(uint rate) external onlyAssociatedContract {
        borrowRates.push(rate);
        borrowRatesLastUpdated = block.timestamp;
    }

    function ratesLastUpdated() public view returns (uint) {
        return borrowRatesLastUpdated;
    }

    function getRatesAndTime(uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        )
    {
        newIndex = getRatesLength();
        entryRate = getRateAt(index);
        lastRate = getRateAt(newIndex - 1);
        lastUpdated = ratesLastUpdated();
    }

    // Short rates, one array per currency.

    function addShortCurrency(bytes32 currency) external onlyAssociatedContract {
        if (shortRates[currency].length > 0) {} else {
            shortRates[currency].push(0);
            shortRatesLastUpdated[currency] = block.timestamp;
        }
    }

    function removeShortCurrency(bytes32 currency) external onlyAssociatedContract {
        delete shortRates[currency];
    }

    function getShortRateAt(bytes32 currency, uint index) internal view returns (uint) {
        return shortRates[currency][index];
    }

    function getShortRatesLength(bytes32 currency) public view returns (uint) {
        return shortRates[currency].length;
    }

    function updateShortRates(bytes32 currency, uint rate) external onlyAssociatedContract {
        shortRates[currency].push(rate);
        shortRatesLastUpdated[currency] = block.timestamp;
    }

    function shortRateLastUpdated(bytes32 currency) internal view returns (uint) {
        return shortRatesLastUpdated[currency];
    }

    function getShortRatesAndTime(bytes32 currency, uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        )
    {
        newIndex = getShortRatesLength(currency);
        entryRate = getShortRateAt(currency, index);
        lastRate = getShortRateAt(currency, newIndex - 1);
        lastUpdated = shortRateLastUpdated(currency);
    }
}


// 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;
}


// https://docs.synthetix.io/contracts/source/interfaces/iexchangerates
interface IExchangeRates {
    // Structs
    struct RateAndUpdatedTime {
        uint216 rate;
        uint40 time;
    }

    struct InversePricing {
        uint entryPoint;
        uint upperLimit;
        uint lowerLimit;
        bool frozenAtUpperLimit;
        bool frozenAtLowerLimit;
    }

    // Views
    function aggregators(bytes32 currencyKey) external view returns (address);

    function aggregatorWarningFlags() external view returns (address);

    function anyRateIsInvalid(bytes32[] calldata currencyKeys) external view returns (bool);

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

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

    function currenciesUsingAggregator(address aggregator) external view returns (bytes32[] memory);

    function effectiveValue(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    ) external view returns (uint value);

    function effectiveValueAndRates(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey
    )
        external
        view
        returns (
            uint value,
            uint sourceRate,
            uint destinationRate
        );

    function effectiveValueAtRound(
        bytes32 sourceCurrencyKey,
        uint sourceAmount,
        bytes32 destinationCurrencyKey,
        uint roundIdForSrc,
        uint roundIdForDest
    ) external view returns (uint value);

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

    function getLastRoundIdBeforeElapsedSecs(
        bytes32 currencyKey,
        uint startingRoundId,
        uint startingTimestamp,
        uint timediff
    ) external view returns (uint);

    function inversePricing(bytes32 currencyKey)
        external
        view
        returns (
            uint entryPoint,
            uint upperLimit,
            uint lowerLimit,
            bool frozenAtUpperLimit,
            bool frozenAtLowerLimit
        );

    function lastRateUpdateTimes(bytes32 currencyKey) external view returns (uint256);

    function oracle() external view returns (address);

    function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time);

    function rateAndUpdatedTime(bytes32 currencyKey) external view returns (uint rate, uint time);

    function rateAndInvalid(bytes32 currencyKey) external view returns (uint rate, bool isInvalid);

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

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

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

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

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

    function rateStalePeriod() external view returns (uint);

    function ratesAndUpdatedTimeForCurrencyLastNRounds(bytes32 currencyKey, uint numRounds)
        external
        view
        returns (uint[] memory rates, uint[] memory times);

    function ratesAndInvalidForCurrencies(bytes32[] calldata currencyKeys)
        external
        view
        returns (uint[] memory rates, bool anyRateInvalid);

    function ratesForCurrencies(bytes32[] calldata currencyKeys) external view returns (uint[] memory);

    // Mutative functions
    function freezeRate(bytes32 currencyKey) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/idebtcache
interface IDebtCache {
    // Views

    function cachedDebt() external view returns (uint);

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

    function cacheTimestamp() external view returns (uint);

    function cacheInvalid() external view returns (bool);

    function cacheStale() external view returns (bool);

    function currentSynthDebts(bytes32[] calldata currencyKeys)
        external
        view
        returns (uint[] memory debtValues, bool anyRateIsInvalid);

    function cachedSynthDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory debtValues);

    function currentDebt() external view returns (uint debt, bool anyRateIsInvalid);

    function cacheInfo()
        external
        view
        returns (
            uint debt,
            uint timestamp,
            bool isInvalid,
            bool isStale
        );

    // Mutative functions

    function takeDebtSnapshot() external;

    function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external;
}


// 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);
}


// Inheritance


// Libraries


// Internal references


contract CollateralManager is ICollateralManager, Owned, Pausable, MixinResolver {
    /* ========== LIBRARIES ========== */
    using SafeMath for uint;
    using SafeDecimalMath for uint;
    using AddressSetLib for AddressSetLib.AddressSet;
    using Bytes32SetLib for Bytes32SetLib.Bytes32Set;

    /* ========== CONSTANTS ========== */

    bytes32 private constant sUSD = "sUSD";

    uint private constant SECONDS_IN_A_YEAR = 31556926 * 1e18;

    // Flexible storage names
    bytes32 public constant CONTRACT_NAME = "CollateralManager";
    bytes32 internal constant COLLATERAL_SYNTHS = "collateralSynth";

    /* ========== STATE VARIABLES ========== */

    // Stores debt balances and borrow rates.
    CollateralManagerState public state;

    // The set of all collateral contracts.
    AddressSetLib.AddressSet internal _collaterals;

    // The set of all synths issuable by the various collateral contracts
    Bytes32SetLib.Bytes32Set internal _synths;

    // Map from currency key to synth contract name.
    mapping(bytes32 => bytes32) public synthsByKey;

    // The set of all synths that are shortable.
    Bytes32SetLib.Bytes32Set internal _shortableSynths;

    mapping(bytes32 => bytes32) public synthToInverseSynth;

    // The factor that will scale the utilisation ratio.
    uint public utilisationMultiplier = 1e18;

    // The maximum amount of debt in sUSD that can be issued by non snx collateral.
    uint public maxDebt;

    // The base interest rate applied to all borrows.
    uint public baseBorrowRate;

    // The base interest rate applied to all shorts.
    uint public baseShortRate;

    /* ---------- Address Resolver Configuration ---------- */

    bytes32 private constant CONTRACT_SYSTEMSTATUS = "SystemStatus";
    bytes32 private constant CONTRACT_ISSUER = "Issuer";
    bytes32 private constant CONTRACT_EXRATES = "ExchangeRates";

    bytes32[24] private addressesToCache = [CONTRACT_SYSTEMSTATUS, CONTRACT_ISSUER, CONTRACT_EXRATES];

    /* ========== CONSTRUCTOR ========== */
    constructor(
        CollateralManagerState _state,
        address _owner,
        address _resolver,
        uint _maxDebt,
        uint _baseBorrowRate,
        uint _baseShortRate
    ) public Owned(_owner) Pausable() MixinResolver(_resolver) {
        owner = msg.sender;
        state = _state;

        setMaxDebt(_maxDebt);
        setBaseBorrowRate(_baseBorrowRate);
        setBaseShortRate(_baseShortRate);

        owner = _owner;
    }

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

    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        bytes32[] memory staticAddresses = new bytes32[](3);
        staticAddresses[0] = CONTRACT_ISSUER;
        staticAddresses[1] = CONTRACT_EXRATES;
        staticAddresses[2] = CONTRACT_SYSTEMSTATUS;

        // we want to cache the name of the synth and the name of its corresponding iSynth
        bytes32[] memory shortAddresses;
        uint length = _shortableSynths.elements.length;

        if (length > 0) {
            shortAddresses = new bytes32[](length * 2);

            for (uint i = 0; i < length; i++) {
                shortAddresses[i] = _shortableSynths.elements[i];
                shortAddresses[i + length] = synthToInverseSynth[_shortableSynths.elements[i]];
            }
        }

        bytes32[] memory synthAddresses = combineArrays(shortAddresses, _synths.elements);

        if (synthAddresses.length > 0) {
            addresses = combineArrays(synthAddresses, staticAddresses);
        } else {
            addresses = staticAddresses;
        }
    }

    // helper function to check whether synth "by key" is a collateral issued by multi-collateral
    function isSynthManaged(bytes32 currencyKey) external view returns (bool) {
        return synthsByKey[currencyKey] != bytes32(0);
    }

    /* ---------- Related Contracts ---------- */

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

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

    function _exchangeRates() internal view returns (IExchangeRates) {
        return IExchangeRates(requireAndGetAddress(CONTRACT_EXRATES));
    }

    function _synth(bytes32 synthName) internal view returns (ISynth) {
        return ISynth(requireAndGetAddress(synthName));
    }

    /* ---------- Manager Information ---------- */

    function hasCollateral(address collateral) public view returns (bool) {
        return _collaterals.contains(collateral);
    }

    function hasAllCollaterals(address[] memory collaterals) public view returns (bool) {
        for (uint i = 0; i < collaterals.length; i++) {
            if (!hasCollateral(collaterals[i])) {
                return false;
            }
        }
        return true;
    }

    /* ---------- State Information ---------- */

    function long(bytes32 synth) external view returns (uint amount) {
        return state.long(synth);
    }

    function short(bytes32 synth) external view returns (uint amount) {
        return state.short(synth);
    }

    function totalLong() public view returns (uint susdValue, bool anyRateIsInvalid) {
        bytes32[] memory synths = _synths.elements;

        if (synths.length > 0) {
            for (uint i = 0; i < synths.length; i++) {
                bytes32 synth = _synth(synths[i]).currencyKey();
                if (synth == sUSD) {
                    susdValue = susdValue.add(state.long(synth));
                } else {
                    (uint rate, bool invalid) = _exchangeRates().rateAndInvalid(synth);
                    uint amount = state.long(synth).multiplyDecimal(rate);
                    susdValue = susdValue.add(amount);
                    if (invalid) {
                        anyRateIsInvalid = true;
                    }
                }
            }
        }
    }

    function totalShort() public view returns (uint susdValue, bool anyRateIsInvalid) {
        bytes32[] memory synths = _shortableSynths.elements;

        if (synths.length > 0) {
            for (uint i = 0; i < synths.length; i++) {
                bytes32 synth = _synth(synths[i]).currencyKey();
                (uint rate, bool invalid) = _exchangeRates().rateAndInvalid(synth);
                uint amount = state.short(synth).multiplyDecimal(rate);
                susdValue = susdValue.add(amount);
                if (invalid) {
                    anyRateIsInvalid = true;
                }
            }
        }
    }

    function getBorrowRate() external view returns (uint borrowRate, bool anyRateIsInvalid) {
        // get the snx backed debt.
        uint snxDebt = _issuer().totalIssuedSynths(sUSD, true);

        // now get the non snx backed debt.
        (uint nonSnxDebt, bool ratesInvalid) = totalLong();

        // the total.
        uint totalDebt = snxDebt.add(nonSnxDebt);

        // now work out the utilisation ratio, and divide through to get a per second value.
        uint utilisation = nonSnxDebt.divideDecimal(totalDebt).divideDecimal(SECONDS_IN_A_YEAR);

        // scale it by the utilisation multiplier.
        uint scaledUtilisation = utilisation.multiplyDecimal(utilisationMultiplier);

        // finally, add the base borrow rate.
        borrowRate = scaledUtilisation.add(baseBorrowRate);

        anyRateIsInvalid = ratesInvalid;
    }

    function getShortRate(bytes32 synth) external view returns (uint shortRate, bool rateIsInvalid) {
        bytes32 synthKey = _synth(synth).currencyKey();

        rateIsInvalid = _exchangeRates().rateIsInvalid(synthKey);

        // get the spot supply of the synth, its iSynth
        uint longSupply = IERC20(address(_synth(synth))).totalSupply();
        uint inverseSupply = IERC20(address(_synth(synthToInverseSynth[synth]))).totalSupply();
        // add the iSynth to supply properly reflect the market skew.
        uint shortSupply = state.short(synthKey).add(inverseSupply);

        // in this case, the market is skewed long so its free to short.
        if (longSupply > shortSupply) {
            return (0, rateIsInvalid);
        }

        // otherwise workout the skew towards the short side.
        uint skew = shortSupply.sub(longSupply);

        // divide through by the size of the market
        uint proportionalSkew = skew.divideDecimal(longSupply.add(shortSupply)).divideDecimal(SECONDS_IN_A_YEAR);

        // finally, add the base short rate.
        shortRate = proportionalSkew.add(baseShortRate);
    }

    function getRatesAndTime(uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        )
    {
        (entryRate, lastRate, lastUpdated, newIndex) = state.getRatesAndTime(index);
    }

    function getShortRatesAndTime(bytes32 currency, uint index)
        external
        view
        returns (
            uint entryRate,
            uint lastRate,
            uint lastUpdated,
            uint newIndex
        )
    {
        (entryRate, lastRate, lastUpdated, newIndex) = state.getShortRatesAndTime(currency, index);
    }

    function exceedsDebtLimit(uint amount, bytes32 currency) external view returns (bool canIssue, bool anyRateIsInvalid) {
        uint usdAmount = _exchangeRates().effectiveValue(currency, amount, sUSD);

        (uint longValue, bool longInvalid) = totalLong();
        (uint shortValue, bool shortInvalid) = totalShort();

        anyRateIsInvalid = longInvalid || shortInvalid;

        return (longValue.add(shortValue).add(usdAmount) <= maxDebt, anyRateIsInvalid);
    }

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

    /* ---------- SETTERS ---------- */

    function setUtilisationMultiplier(uint _utilisationMultiplier) public onlyOwner {
        require(_utilisationMultiplier > 0, "Must be greater than 0");
        utilisationMultiplier = _utilisationMultiplier;
    }

    function setMaxDebt(uint _maxDebt) public onlyOwner {
        require(_maxDebt > 0, "Must be greater than 0");
        maxDebt = _maxDebt;
        emit MaxDebtUpdated(maxDebt);
    }

    function setBaseBorrowRate(uint _baseBorrowRate) public onlyOwner {
        baseBorrowRate = _baseBorrowRate;
        emit BaseBorrowRateUpdated(baseBorrowRate);
    }

    function setBaseShortRate(uint _baseShortRate) public onlyOwner {
        baseShortRate = _baseShortRate;
        emit BaseShortRateUpdated(baseShortRate);
    }

    /* ---------- LOANS ---------- */

    function getNewLoanId() external onlyCollateral returns (uint id) {
        id = state.incrementTotalLoans();
    }

    /* ---------- MANAGER ---------- */

    function addCollaterals(address[] calldata collaterals) external onlyOwner {
        _systemStatus().requireSystemActive();

        for (uint i = 0; i < collaterals.length; i++) {
            if (!_collaterals.contains(collaterals[i])) {
                _collaterals.add(collaterals[i]);
                emit CollateralAdded(collaterals[i]);
            }
        }
    }

    function removeCollaterals(address[] calldata collaterals) external onlyOwner {
        _systemStatus().requireSystemActive();

        for (uint i = 0; i < collaterals.length; i++) {
            if (_collaterals.contains(collaterals[i])) {
                _collaterals.remove(collaterals[i]);
                emit CollateralRemoved(collaterals[i]);
            }
        }
    }

    function addSynths(bytes32[] calldata synthNamesInResolver, bytes32[] calldata synthKeys) external onlyOwner {
        _systemStatus().requireSystemActive();

        for (uint i = 0; i < synthNamesInResolver.length; i++) {
            if (!_synths.contains(synthNamesInResolver[i])) {
                bytes32 synthName = synthNamesInResolver[i];
                _synths.add(synthName);
                synthsByKey[synthKeys[i]] = synthName;
                emit SynthAdded(synthName);
            }
        }
    }

    function areSynthsAndCurrenciesSet(bytes32[] calldata requiredSynthNamesInResolver, bytes32[] calldata synthKeys)
        external
        view
        returns (bool)
    {
        if (_synths.elements.length != requiredSynthNamesInResolver.length) {
            return false;
        }

        for (uint i = 0; i < requiredSynthNamesInResolver.length; i++) {
            if (!_synths.contains(requiredSynthNamesInResolver[i])) {
                return false;
            }
            if (synthsByKey[synthKeys[i]] != requiredSynthNamesInResolver[i]) {
                return false;
            }
        }

        return true;
    }

    function removeSynths(bytes32[] calldata synths, bytes32[] calldata synthKeys) external onlyOwner {
        _systemStatus().requireSystemActive();

        for (uint i = 0; i < synths.length; i++) {
            if (_synths.contains(synths[i])) {
                // Remove it from the the address set lib.
                _synths.remove(synths[i]);
                delete synthsByKey[synthKeys[i]];

                emit SynthRemoved(synths[i]);
            }
        }
    }

    // When we add a shortable synth, we need to know the iSynth as well
    // This is so we can get the proper skew for the short rate.
    function addShortableSynths(bytes32[2][] calldata requiredSynthAndInverseNamesInResolver, bytes32[] calldata synthKeys)
        external
        onlyOwner
    {
        _systemStatus().requireSystemActive();

        require(requiredSynthAndInverseNamesInResolver.length == synthKeys.length, "Input array length mismatch");

        for (uint i = 0; i < requiredSynthAndInverseNamesInResolver.length; i++) {
            // setting these explicitly for clarity
            // Each entry in the array is [Synth, iSynth]
            bytes32 synth = requiredSynthAndInverseNamesInResolver[i][0];
            bytes32 iSynth = requiredSynthAndInverseNamesInResolver[i][1];

            if (!_shortableSynths.contains(synth)) {
                // Add it to the address set lib.
                _shortableSynths.add(synth);

                // store the mapping to the iSynth so we can get its total supply for the borrow rate.
                synthToInverseSynth[synth] = iSynth;

                emit ShortableSynthAdded(synth);

                // now the associated synth key to the CollateralManagerState
                state.addShortCurrency(synthKeys[i]);
            }
        }

        rebuildCache();
    }

    function areShortableSynthsSet(bytes32[] calldata requiredSynthNamesInResolver, bytes32[] calldata synthKeys)
        external
        view
        returns (bool)
    {
        require(requiredSynthNamesInResolver.length == synthKeys.length, "Input array length mismatch");

        if (_shortableSynths.elements.length != requiredSynthNamesInResolver.length) {
            return false;
        }

        // first check contract state
        for (uint i = 0; i < requiredSynthNamesInResolver.length; i++) {
            bytes32 synthName = requiredSynthNamesInResolver[i];
            if (!_shortableSynths.contains(synthName) || synthToInverseSynth[synthName] == bytes32(0)) {
                return false;
            }
        }

        // now check everything added to external state contract
        for (uint i = 0; i < synthKeys.length; i++) {
            if (state.getShortRatesLength(synthKeys[i]) == 0) {
                return false;
            }
        }

        return true;
    }

    function removeShortableSynths(bytes32[] calldata synths) external onlyOwner {
        _systemStatus().requireSystemActive();

        for (uint i = 0; i < synths.length; i++) {
            if (_shortableSynths.contains(synths[i])) {
                // Remove it from the the address set lib.
                _shortableSynths.remove(synths[i]);

                bytes32 synthKey = _synth(synths[i]).currencyKey();

                state.removeShortCurrency(synthKey);

                // remove the inverse mapping.
                delete synthToInverseSynth[synths[i]];

                emit ShortableSynthRemoved(synths[i]);
            }
        }
    }

    /* ---------- STATE MUTATIONS ---------- */

    function updateBorrowRates(uint rate) external onlyCollateral {
        state.updateBorrowRates(rate);
    }

    function updateShortRates(bytes32 currency, uint rate) external onlyCollateral {
        state.updateShortRates(currency, rate);
    }

    function incrementLongs(bytes32 synth, uint amount) external onlyCollateral {
        state.incrementLongs(synth, amount);
    }

    function decrementLongs(bytes32 synth, uint amount) external onlyCollateral {
        state.decrementLongs(synth, amount);
    }

    function incrementShorts(bytes32 synth, uint amount) external onlyCollateral {
        state.incrementShorts(synth, amount);
    }

    function decrementShorts(bytes32 synth, uint amount) external onlyCollateral {
        state.decrementShorts(synth, amount);
    }

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

    modifier onlyCollateral {
        bool isMultiCollateral = hasCollateral(msg.sender);

        require(isMultiCollateral, "Only collateral contracts");
        _;
    }

    // ========== EVENTS ==========
    event MaxDebtUpdated(uint maxDebt);
    event LiquidationPenaltyUpdated(uint liquidationPenalty);
    event BaseBorrowRateUpdated(uint baseBorrowRate);
    event BaseShortRateUpdated(uint baseShortRate);

    event CollateralAdded(address collateral);
    event CollateralRemoved(address collateral);

    event SynthAdded(bytes32 synth);
    event SynthRemoved(bytes32 synth);

    event ShortableSynthAdded(bytes32 synth);
    event ShortableSynthRemoved(bytes32 synth);
}

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CollateralManagerState","name":"_state","type":"address"},{"internalType":"address","name":"_owner","type":"address"},{"internalType":"address","name":"_resolver","type":"address"},{"internalType":"uint256","name":"_maxDebt","type":"uint256"},{"internalType":"uint256","name":"_baseBorrowRate","type":"uint256"},{"internalType":"uint256","name":"_baseShortRate","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"baseBorrowRate","type":"uint256"}],"name":"BaseBorrowRateUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"baseShortRate","type":"uint256"}],"name":"BaseShortRateUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"name","type":"bytes32"},{"indexed":false,"internalType":"address","name":"destination","type":"address"}],"name":"CacheUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"collateral","type":"address"}],"name":"CollateralAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"collateral","type":"address"}],"name":"CollateralRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"liquidationPenalty","type":"uint256"}],"name":"LiquidationPenaltyUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"maxDebt","type":"uint256"}],"name":"MaxDebtUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"isPaused","type":"bool"}],"name":"PauseChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"synth","type":"bytes32"}],"name":"ShortableSynthAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"synth","type":"bytes32"}],"name":"ShortableSynthRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"synth","type":"bytes32"}],"name":"SynthAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"synth","type":"bytes32"}],"name":"SynthRemoved","type":"event"},{"constant":true,"inputs":[],"name":"CONTRACT_NAME","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address[]","name":"collaterals","type":"address[]"}],"name":"addCollaterals","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32[2][]","name":"requiredSynthAndInverseNamesInResolver","type":"bytes32[2][]"},{"internalType":"bytes32[]","name":"synthKeys","type":"bytes32[]"}],"name":"addShortableSynths","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32[]","name":"synthNamesInResolver","type":"bytes32[]"},{"internalType":"bytes32[]","name":"synthKeys","type":"bytes32[]"}],"name":"addSynths","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32[]","name":"requiredSynthNamesInResolver","type":"bytes32[]"},{"internalType":"bytes32[]","name":"synthKeys","type":"bytes32[]"}],"name":"areShortableSynthsSet","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32[]","name":"requiredSynthNamesInResolver","type":"bytes32[]"},{"internalType":"bytes32[]","name":"synthKeys","type":"bytes32[]"}],"name":"areSynthsAndCurrenciesSet","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"baseBorrowRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"baseShortRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"synth","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"decrementLongs","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"synth","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"decrementShorts","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes32","name":"currency","type":"bytes32"}],"name":"exceedsDebtLimit","outputs":[{"internalType":"bool","name":"canIssue","type":"bool"},{"internalType":"bool","name":"anyRateIsInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getBorrowRate","outputs":[{"internalType":"uint256","name":"borrowRate","type":"uint256"},{"internalType":"bool","name":"anyRateIsInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"getNewLoanId","outputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getRatesAndTime","outputs":[{"internalType":"uint256","name":"entryRate","type":"uint256"},{"internalType":"uint256","name":"lastRate","type":"uint256"},{"internalType":"uint256","name":"lastUpdated","type":"uint256"},{"internalType":"uint256","name":"newIndex","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"synth","type":"bytes32"}],"name":"getShortRate","outputs":[{"internalType":"uint256","name":"shortRate","type":"uint256"},{"internalType":"bool","name":"rateIsInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"currency","type":"bytes32"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getShortRatesAndTime","outputs":[{"internalType":"uint256","name":"entryRate","type":"uint256"},{"internalType":"uint256","name":"lastRate","type":"uint256"},{"internalType":"uint256","name":"lastUpdated","type":"uint256"},{"internalType":"uint256","name":"newIndex","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address[]","name":"collaterals","type":"address[]"}],"name":"hasAllCollaterals","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"collateral","type":"address"}],"name":"hasCollateral","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"synth","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"incrementLongs","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"synth","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"incrementShorts","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"isResolverCached","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"isSynthManaged","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"lastPauseTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"synth","type":"bytes32"}],"name":"long","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"maxDebt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"nominateNewOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"nominatedOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"rebuildCache","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address[]","name":"collaterals","type":"address[]"}],"name":"removeCollaterals","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32[]","name":"synths","type":"bytes32[]"}],"name":"removeShortableSynths","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32[]","name":"synths","type":"bytes32[]"},{"internalType":"bytes32[]","name":"synthKeys","type":"bytes32[]"}],"name":"removeSynths","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"resolver","outputs":[{"internalType":"contract AddressResolver","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"resolverAddressesRequired","outputs":[{"internalType":"bytes32[]","name":"addresses","type":"bytes32[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_baseBorrowRate","type":"uint256"}],"name":"setBaseBorrowRate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_baseShortRate","type":"uint256"}],"name":"setBaseShortRate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_maxDebt","type":"uint256"}],"name":"setMaxDebt","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bool","name":"_paused","type":"bool"}],"name":"setPaused","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_utilisationMultiplier","type":"uint256"}],"name":"setUtilisationMultiplier","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"synth","type":"bytes32"}],"name":"short","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"state","outputs":[{"internalType":"contract CollateralManagerState","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"synthToInverseSynth","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"synthsByKey","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalLong","outputs":[{"internalType":"uint256","name":"susdValue","type":"uint256"},{"internalType":"bool","name":"anyRateIsInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalShort","outputs":[{"internalType":"uint256","name":"susdValue","type":"uint256"},{"internalType":"bool","name":"anyRateIsInvalid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"rate","type":"uint256"}],"name":"updateBorrowRates","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"currency","type":"bytes32"},{"internalType":"uint256","name":"rate","type":"uint256"}],"name":"updateShortRates","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"utilisationMultiplier","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]

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0000000000000000000000008d65ed88d6162a2b3b5f71c45d433d4aeac93065000000000000000000000000b64ff7a4a33acdf48d97dab0d764afd0f6176882000000000000000000000000242a3df52c375bee81b1c668741d7c63af68fdd200000000000000000000000000000000000000000052b7d2dcc80cd2e40000000000000000000000000000000000000000000000000000000001c6bf526340000000000000000000000000000000000000000000000000000001c6bf52634000

-----Decoded View---------------
Arg [0] : _state (address): 0x8d65ed88d6162a2b3b5f71c45d433d4aeac93065
Arg [1] : _owner (address): 0xb64ff7a4a33acdf48d97dab0d764afd0f6176882
Arg [2] : _resolver (address): 0x242a3df52c375bee81b1c668741d7c63af68fdd2
Arg [3] : _maxDebt (uint256): 100000000000000000000000000
Arg [4] : _baseBorrowRate (uint256): 500000000000000
Arg [5] : _baseShortRate (uint256): 500000000000000

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000008d65ed88d6162a2b3b5f71c45d433d4aeac93065
Arg [1] : 000000000000000000000000b64ff7a4a33acdf48d97dab0d764afd0f6176882
Arg [2] : 000000000000000000000000242a3df52c375bee81b1c668741d7c63af68fdd2
Arg [3] : 00000000000000000000000000000000000000000052b7d2dcc80cd2e4000000
Arg [4] : 0000000000000000000000000000000000000000000000000001c6bf52634000
Arg [5] : 0000000000000000000000000000000000000000000000000001c6bf52634000

SafeDecimalMath : 0x1a60e2e2a8be0bc2b6381dd31fd3fd5f9a28de4c