ActivePool

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

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

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

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

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

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

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "contracts/Guardable.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

/**
 * @title Guardable
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (a guardian) that can be granted exclusive access to
 * specific functions.
 *
 * This module is essentially a renamed version of the OpenZeppelin Ownable contract.
 * The main difference is in terminology:
 * - 'owner' is renamed to 'guardian'
 * - 'ownership' concepts are renamed to 'watch' or 'guard'
 *
 * By default, the guardian account will be the one that deploys the contract. This
 * can later be changed with {transferWatch}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyGuardian`, which can be applied to your functions to restrict their use to
 * the guardian.
 */
abstract contract Guardable {
    address private _guardian;

    event WatchTransferred(address indexed previousGuardian, address indexed newGuardian);

    /**
     * @dev Initializes the contract setting the deployer as the initial guardian.
     */
    constructor() {
        _transferWatch(msg.sender);
    }

    /**
     * @dev Throws if called by any account other than the guardian.
     */
    modifier onlyGuardian() {
        _checkGuardian();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the guardian.
     */
    function _checkGuardian() internal view virtual {
        require(guardian() == msg.sender, "Guardable: caller is not the guardian");
    }

    /**
     * @dev Leaves the contract without guardian. It will not be possible to call
     * `onlyGuardian` functions anymore. Can only be called by the current guardian.
     *
     * NOTE: Renouncing guardianship will leave the contract without a guardian,
     * thereby removing any functionality that is only available to the guardian.
     */
    function releaseGuard() public virtual onlyGuardian {
        _transferWatch(address(0));
    }

    /**
     * @dev Transfers guardianship of the contract to a new account (`newGuardian`).
     * Can only be called by the current guardian.
     */
    function transferWatch(address newGuardian) public virtual onlyGuardian {
        require(newGuardian != address(0), "Guardable: new guardian is the zero address");
        _transferWatch(newGuardian);
    }

    /**
     * @dev Transfers guardianship of the contract to a new account (`newGuardian`).
     * Internal function without access restriction.
     */
    function _transferWatch(address newGuardian) internal virtual {
        address oldGuardian = _guardian;
        _guardian = newGuardian;
        emit WatchTransferred(oldGuardian, newGuardian);
    }
}"
    },
    "contracts/interfaces/IActivePool.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

import "./IPool.sol";
import "./ICanReceiveCollateral.sol";

/// @title IActivePool Interface
/// @notice Interface for the ActivePool contract which manages the main collateral pool
interface IActivePool is IPool, ICanReceiveCollateral {
    /// @notice Emitted when the stable debt in the ActivePool is updated
    /// @param _STABLEDebt The new total stable debt amount
    event ActivePoolStableDebtUpdated(uint _STABLEDebt);

    /// @notice Emitted when the collateral balance in the ActivePool is updated
    /// @param _Collateral The new total collateral amount
    event ActivePoolCollateralBalanceUpdated(uint _Collateral);

    /// @notice Sends collateral from the ActivePool to a specified account
    /// @param _account The address of the account to receive the collateral
    /// @param _amount The amount of collateral to send
    function sendCollateral(address _account, uint _amount) external;

    /// @notice Sets the addresses of connected contracts and components
    /// @param _positionControllerAddress Address of the PositionController contract
    /// @param _positionManagerAddress Address of the PositionManager contract
    /// @param _backstopPoolAddress Address of the BackstopPool contract
    /// @param _defaultPoolAddress Address of the DefaultPool contract
    /// @param _collateralAssetAddress Address of the collateral asset token
    function setAddresses(
        address _positionControllerAddress,
        address _positionManagerAddress,
        address _backstopPoolAddress,
        address _defaultPoolAddress,
        address _collateralAssetAddress
    ) external;
}"
    },
    "contracts/interfaces/ICanReceiveCollateral.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

// Common interface for the contracts which need internal collateral counters to be updated.
interface ICanReceiveCollateral {
    function receiveCollateral(address asset, uint amount) external;
}
"
    },
    "contracts/interfaces/IPool.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

/// @title IPool Interface
/// @notice Interface for Pool contracts that manage collateral and stable debt
interface IPool {
    /// @notice Emitted when collateral is sent from the pool
    /// @param _to The address receiving the collateral
    /// @param _amount The amount of collateral sent
    event CollateralSent(address _to, uint _amount);

    /// @notice Gets the total amount of collateral in the pool
    /// @return The total amount of collateral
    function getCollateral() external view returns (uint);

    /// @notice Gets the total amount of stable debt in the pool
    /// @return The total amount of stable debt
    function getStableDebt() external view returns (uint);

    /// @notice Increases the stable debt in the pool
    /// @param _amount The amount to increase the debt by
    function increaseStableDebt(uint _amount) external;

    /// @notice Decreases the stable debt in the pool
    /// @param _amount The amount to decrease the debt by
    function decreaseStableDebt(uint _amount) external;
}"
    },
    "contracts/interfaces/IPositionManager.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

/// @title IPositionManager Interface
/// @notice Interface for the PositionManager contract which manages individual positions
interface IPositionManager {
    /// @notice Emitted when a redemption occurs
    /// @param _attemptedStableAmount The amount of stable tokens attempted to redeem
    /// @param _actualStableAmount The actual amount of stable tokens redeemed
    /// @param _CollateralSent The amount of collateral sent to the redeemer
    /// @param _CollateralFee The fee paid in collateral for the redemption
    event Redemption(uint _attemptedStableAmount, uint _actualStableAmount, uint _CollateralSent, uint _CollateralFee);

    /// @notice Emitted when total stakes are updated
    /// @param _newTotalStakes The new total stakes value
    event TotalStakesUpdated(uint _newTotalStakes);

    /// @notice Emitted when system snapshots are updated
    /// @param _totalStakesSnapshot The new total stakes snapshot
    /// @param _totalCollateralSnapshot The new total collateral snapshot
    event SystemSnapshotsUpdated(uint _totalStakesSnapshot, uint _totalCollateralSnapshot);

    /// @notice Emitted when L terms are updated
    /// @param _L_Collateral The new L_Collateral value
    /// @param _L_STABLE The new L_STABLE value
    event LTermsUpdated(uint _L_Collateral, uint _L_STABLE);

    /// @notice Emitted when position snapshots are updated
    /// @param _L_Collateral The new L_Collateral value for the position
    /// @param _L_STABLEDebt The new L_STABLEDebt value for the position
    event PositionSnapshotsUpdated(uint _L_Collateral, uint _L_STABLEDebt);

    /// @notice Emitted when a position's index is updated
    /// @param _borrower The address of the position owner
    /// @param _newIndex The new index value
    event PositionIndexUpdated(address _borrower, uint _newIndex);

    /// @notice Get the total count of position owners
    /// @return The number of position owners
    function getPositionOwnersCount() external view returns (uint);

    /// @notice Get a position owner's address by index
    /// @param _index The index in the position owners array
    /// @return The address of the position owner
    function getPositionFromPositionOwnersArray(uint _index) external view returns (address);

    /// @notice Get the nominal ICR (Individual Collateral Ratio) of a position
    /// @param _borrower The address of the position owner
    /// @return The nominal ICR of the position
    function getNominalICR(address _borrower) external view returns (uint);

    /// @notice Get the current ICR of a position
    /// @param _borrower The address of the position owner
    /// @param _price The current price of the collateral
    /// @return The current ICR of the position
    function getCurrentICR(address _borrower, uint _price) external view returns (uint);

    /// @notice Liquidate a single position
    /// @param _borrower The address of the position owner to liquidate
    function liquidate(address _borrower) external;

    /// @notice Liquidate multiple positions
    /// @param _n The number of positions to attempt to liquidate
    function liquidatePositions(uint _n) external;

    /// @notice Batch liquidate a specific set of positions
    /// @param _positionArray An array of position owner addresses to liquidate
    function batchLiquidatePositions(address[] calldata _positionArray) external;

    /// @notice Queue a redemption request
    /// @param _stableAmount The amount of stable tokens to queue for redemption
    function queueRedemption(uint _stableAmount) external;

    /// @notice Redeem collateral for stable tokens
    /// @param _stableAmount The amount of stable tokens to redeem
    /// @param _firstRedemptionHint The address of the first position to consider for redemption
    /// @param _upperPartialRedemptionHint The address of the position just above the partial redemption
    /// @param _lowerPartialRedemptionHint The address of the position just below the partial redemption
    /// @param _partialRedemptionHintNICR The nominal ICR of the partial redemption hint
    /// @param _maxIterations The maximum number of iterations to perform in the redemption algorithm
    /// @param _maxFee The maximum acceptable fee percentage for the redemption
    function redeemCollateral(
        uint _stableAmount,
        address _firstRedemptionHint,
        address _upperPartialRedemptionHint,
        address _lowerPartialRedemptionHint,
        uint _partialRedemptionHintNICR,
        uint _maxIterations,
        uint _maxFee
    ) external;

    /// @notice Update the stake and total stakes for a position
    /// @param _borrower The address of the position owner
    /// @return The new stake value
    function updateStakeAndTotalStakes(address _borrower) external returns (uint);

    /// @notice Update the reward snapshots for a position
    /// @param _borrower The address of the position owner
    function updatePositionRewardSnapshots(address _borrower) external;

    /// @notice Add a position owner to the array of position owners
    /// @param _borrower The address of the position owner
    /// @return index The index of the new position owner in the array
    function addPositionOwnerToArray(address _borrower) external returns (uint index);

    /// @notice Apply pending rewards to a position
    /// @param _borrower The address of the position owner
    function applyPendingRewards(address _borrower) external;

    /// @notice Get the pending collateral reward for a position
    /// @param _borrower The address of the position owner
    /// @return The amount of pending collateral reward
    function getPendingCollateralReward(address _borrower) external view returns (uint);

    /// @notice Get the pending stable debt reward for a position
    /// @param _borrower The address of the position owner
    /// @return The amount of pending stable debt reward
    function getPendingStableDebtReward(address _borrower) external view returns (uint);

    /// @notice Check if a position has pending rewards
    /// @param _borrower The address of the position owner
    /// @return True if the position has pending rewards, false otherwise
    function hasPendingRewards(address _borrower) external view returns (bool);

    /// @notice Get the entire debt and collateral for a position, including pending rewards
    /// @param _borrower The address of the position owner
    /// @return debt The total debt of the position
    /// @return coll The total collateral of the position
    /// @return pendingStableDebtReward The pending stable debt reward
    /// @return pendingCollateralReward The pending collateral reward
    function getEntireDebtAndColl(address _borrower)
    external view returns (uint debt, uint coll, uint pendingStableDebtReward, uint pendingCollateralReward);

    /// @notice Close a position
    /// @param _borrower The address of the position owner
    function closePosition(address _borrower) external;

    /// @notice Remove the stake for a position
    /// @param _borrower The address of the position owner
    function removeStake(address _borrower) external;

    /// @notice Get the current redemption rate
    /// @param suggestedAdditiveFeePCT The suggested additive fee percentage
    /// @return The current redemption rate
    function getRedemptionRate(uint suggestedAdditiveFeePCT) external view returns (uint);

    /// @notice Get the redemption rate with decay
    /// @param suggestedAdditiveFeePCT The suggested additive fee percentage
    /// @return The redemption rate with decay applied
    function getRedemptionRateWithDecay(uint suggestedAdditiveFeePCT) external view returns (uint);

    /// @notice Get the redemption fee with decay
    /// @param _CollateralDrawn The amount of collateral drawn
    /// @param suggestedAdditiveFeePCT The suggested additive fee percentage
    /// @return The redemption fee with decay applied
    function getRedemptionFeeWithDecay(uint _CollateralDrawn, uint suggestedAdditiveFeePCT) external view returns (uint);

    /// @notice Get the current borrowing rate
    /// @param suggestedAdditiveFeePCT The suggested additive fee percentage
    /// @return The current borrowing rate
    function getBorrowingRate(uint suggestedAdditiveFeePCT) external view returns (uint);

    /// @notice Get the borrowing rate with decay
    /// @param suggestedAdditiveFeePCT The suggested additive fee percentage
    /// @return The borrowing rate with decay applied
    function getBorrowingRateWithDecay(uint suggestedAdditiveFeePCT) external view returns (uint);

    /// @notice Get the borrowing fee
    /// @param stableDebt The amount of stable debt
    /// @param suggestedAdditiveFeePCT The suggested additive fee percentage
    /// @return The borrowing fee
    function getBorrowingFee(uint stableDebt, uint suggestedAdditiveFeePCT) external view returns (uint);

    /// @notice Get the borrowing fee with decay
    /// @param _stableDebt The amount of stable debt
    /// @param suggestedAdditiveFeePCT The suggested additive fee percentage
    /// @return The borrowing fee with decay applied
    function getBorrowingFeeWithDecay(uint _stableDebt, uint suggestedAdditiveFeePCT) external view returns (uint);

    /// @notice Decay the base rate from borrowing
    function decayBaseRateFromBorrowing() external;

    /// @notice Get the status of a position
    /// @param _borrower The address of the position owner
    /// @return The status of the position
    function getPositionStatus(address _borrower) external view returns (uint);

    /// @notice Get the stake of a position
    /// @param _borrower The address of the position owner
    /// @return The stake of the position
    function getPositionStake(address _borrower) external view returns (uint);

    /// @notice Get the debt of a position
    /// @param _borrower The address of the position owner
    /// @return The debt of the position
    function getPositionDebt(address _borrower) external view returns (uint);

    /// @notice Get the collateral of a position
    /// @param _borrower The address of the position owner
    /// @return The collateral of the position
    function getPositionColl(address _borrower) external view returns (uint);

    /// @notice Set the status of a position
    /// @param _borrower The address of the position owner
    /// @param num The new status value
    function setPositionStatus(address _borrower, uint num) external;

    /// @notice Increase the collateral of a position
    /// @param _borrower The address of the position owner
    /// @param _collIncrease The amount of collateral to increase
    /// @return The new collateral amount
    function increasePositionColl(address _borrower, uint _collIncrease) external returns (uint);

    /// @notice Decrease the collateral of a position
    /// @param _borrower The address of the position owner
    /// @param _collDecrease The amount of collateral to decrease
    /// @return The new collateral amount
    function decreasePositionColl(address _borrower, uint _collDecrease) external returns (uint);

    /// @notice Increase the debt of a position
    /// @param _borrower The address of the position owner
    /// @param _debtIncrease The amount of debt to increase
    /// @return The new debt amount
    function increasePositionDebt(address _borrower, uint _debtIncrease) external returns (uint);

    /// @notice Decrease the debt of a position
    /// @param _borrower The address of the position owner
    /// @param _debtDecrease The amount of debt to decrease
    /// @return The new debt amount
    function decreasePositionDebt(address _borrower, uint _debtDecrease) external returns (uint);

    /// @notice Get the entire debt of the system
    /// @return total The total debt in the system
    function getEntireDebt() external view returns (uint total);

    /// @notice Get the entire collateral in the system
    /// @return total The total collateral in the system
    function getEntireCollateral() external view returns (uint total);

    /// @notice Get the Total Collateral Ratio (TCR) of the system
    /// @param _price The current price of the collateral
    /// @return TCR The Total Collateral Ratio
    function getTCR(uint _price) external view returns(uint TCR);

    /// @notice Check if the system is in Recovery Mode
    /// @param _price The current price of the collateral
    /// @return True if the system is in Recovery Mode, false otherwise
    function checkRecoveryMode(uint _price) external returns(bool);

    /// @notice Check if the position manager is in sunset mode
    /// @return True if the position manager is in sunset mode, false otherwise
    function isSunset() external returns(bool);
}"
    },
    "contracts/interfaces/IRecoverable.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

/// @title IRecoverable Interface
/// @notice Interface for contracts that can recover orphaned tokens
interface IRecoverable {
    /// @notice Extracts orphaned tokens from the contract
    /// @dev This function should only be callable by authorized roles (e.g., guardian)
    /// @param asset The address of the token to be extracted
    /// @param version The version of the token (if applicable)
    function extractOrphanedTokens(address asset, uint8 version) external;
}"
    },
    "contracts/stable/collateral/instance/ActivePool.sol": {
      "content": "// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "../../../interfaces/IActivePool.sol";
import "../../../interfaces/IPositionManager.sol";
import "../../../Guardable.sol";
import "../../../interfaces/IRecoverable.sol";

/**
 * @title ActivePool
 * @dev Contract for managing the active pool of collateral and stable debt in the system.
 *
 * Key features:
 *      1. Collateral Management: Tracks and manages the collateral balance in the system.
 *      2. Stable Debt Tracking: Keeps record of the total stable debt in the system.
 *      3. Access Control: Restricts certain functions to specific system contracts.
 *      4. Token Recovery: Allows extraction of orphaned tokens in case of a sunset event.
 */
contract ActivePool is Ownable, IActivePool, Guardable, IRecoverable {
    // Addresses of key contracts and tokens in the system
    address public collateralAssetAddress;
    address public positionControllerAddress;
    address public positionManagerAddress;
    address public backstopPoolAddress;
    address public defaultPoolAddress;

    // Internal state variables
    uint256 internal Collateral;  // Total collateral in the pool
    uint256 internal stableDebt;  // Total stable debt in the system

    /**
     * @dev Sets the addresses of key contracts in the system
     * @param _positionControllerAddress Address of the Position Controller contract
     * @param _positionManagerAddress Address of the Position Manager contract
     * @param _backstopPoolAddress Address of the Backstop Pool contract
     * @param _defaultPoolAddress Address of the Default Pool contract
     * @param _collateralAssetAddress Address of the Collateral Asset token
     */
    function setAddresses(
        address _positionControllerAddress,
        address _positionManagerAddress,
        address _backstopPoolAddress,
        address _defaultPoolAddress,
        address _collateralAssetAddress
    )
    external
    onlyOwner
    {
        collateralAssetAddress = _collateralAssetAddress;
        positionControllerAddress = _positionControllerAddress;
        positionManagerAddress = _positionManagerAddress;
        backstopPoolAddress = _backstopPoolAddress;
        defaultPoolAddress = _defaultPoolAddress;

        renounceOwnership();
    }

    /**
     * @dev Returns the current collateral balance in the pool
     * @return The amount of collateral in the pool
     */
    function getCollateral() external view override returns (uint) {
        return Collateral;
    }

    /**
     * @dev Returns the current stable debt in the system
     * @return The amount of stable debt
     */
    function getStableDebt() external view override returns (uint) {
        return stableDebt;
    }

    /**
     * @dev Sends collateral to a specified account
     * @param _account The address to receive the collateral
     * @param _amount The amount of collateral to send
     */
    function sendCollateral(address _account, uint _amount) external override {
        _requireCallerIsPCorPMorBP();
        Collateral -= _amount;
        emit ActivePoolCollateralBalanceUpdated(Collateral);
        emit CollateralSent(_account, _amount);
        require(IERC20(collateralAssetAddress).transfer(_account, _amount), "ActivePool: sending Collateral failed");
    }

    /**
     * @dev Receives collateral into the pool
     * @param asset The address of the collateral asset
     * @param amount The amount of collateral to receive
     */
    function receiveCollateral(address asset, uint amount) external override {
        _requireCallerIsPositionControllerOrDefaultPool();
        require(asset == collateralAssetAddress, "ActivePool: Was sent unexpected collateral");
        Collateral += amount;
        emit ActivePoolCollateralBalanceUpdated(Collateral);
    }

    /**
     * @dev Increases the stable debt in the system
     * @param _amount The amount to increase the stable debt by
     */
    function increaseStableDebt(uint _amount) external override {
        _requireCallerIsPCorPM();
        stableDebt += _amount;
        emit ActivePoolStableDebtUpdated(stableDebt);
    }

    /**
     * @dev Decreases the stable debt in the system
     * @param _amount The amount to decrease the stable debt by
     */
    function decreaseStableDebt(uint _amount) external override {
        _requireCallerIsPCorPMorBP();
        stableDebt -= _amount;
        emit ActivePoolStableDebtUpdated(stableDebt);
    }

    /**
     * @dev Checks if the caller is either the Position Controller or Default Pool
     */
    function _requireCallerIsPositionControllerOrDefaultPool() internal view {
        require(
            msg.sender == positionControllerAddress ||
            msg.sender == defaultPoolAddress,
            "ActivePool: Caller is neither PC nor Default Pool");
    }

    /**
     * @dev Checks if the caller is either the Position Controller, Position Manager, or Backstop Pool
     */
    function _requireCallerIsPCorPMorBP() internal view {
        require(
            msg.sender == positionControllerAddress ||
            msg.sender == positionManagerAddress ||
            msg.sender == backstopPoolAddress,
            "ActivePool: Caller is neither PC nor PM nor BP");
    }

    /**
     * @dev Checks if the caller is either the Position Controller or Position Manager
     */
    function _requireCallerIsPCorPM() internal view {
        require(
            msg.sender == positionControllerAddress ||
            msg.sender == positionManagerAddress,
            "ActivePool: Caller is neither PC nor PM");
    }

    /**
     * @dev Extracts orphaned tokens from the contract in case of a sunset event
     * @param asset The address of the asset to extract
     * @param version The version of the extraction (unused in this implementation)
     */
    function extractOrphanedTokens(address asset, uint8 version) external override onlyGuardian {
        require(
            IPositionManager(positionManagerAddress).isSunset(),
            "Orphaned tokens can only be extracted if collateral is sunset"
        );

        IERC20 collateral = IERC20(collateralAssetAddress);
        collateral.transfer(guardian(), collateral.balanceOf(address(this)));
    }
}"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 1
    },
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "libraries": {}
  }
}}