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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.14;

import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "../Dependencies/BaseMath.sol";
import "../Dependencies/CheckContract.sol";
import "../Dependencies/DfrancMath.sol";
import "../Dependencies/Initializable.sol";
import "../Interfaces/IMONStaking.sol";
import "../Interfaces/IDeposit.sol";
import "../Dependencies/SafetyTransfer.sol";

contract MONStaking is
	IMONStaking,
	Pausable,
	Ownable,
	CheckContract,
	BaseMath,
	ReentrancyGuard,
	Initializable
{
	using SafeMath for uint256;
	using SafeERC20 for IERC20;

	bool public isInitialized;

	// --- Data ---
	string public constant NAME = "MONStaking";
	address constant ETH_REF_ADDRESS = address(0);

	mapping(address => uint256) public stakes;
	uint256 public totalMONStaked;

	mapping(address => uint256) public F_ASSETS; // Running sum of ETH fees per-MON-staked
	uint256 public F_DCHF; // Running sum of MON fees per-MON-staked

	// User snapshots of F_ETH and F_DCHF, taken at the point at which their latest deposit was made
	mapping(address => Snapshot) public snapshots;

	struct Snapshot {
		mapping(address => uint256) F_ASSET_Snapshot;
		uint256 F_DCHF_Snapshot;
	}

	address[] ASSET_TYPE;
	mapping(address => bool) isAssetTracked;
	mapping(address => uint256) public sentToTreasuryTracker;

	IERC20 public monToken;
	IERC20 public dchfToken;

	address public troveManagerAddress;
	address public troveManagerHelpersAddress;
	address public borrowerOperationsAddress;
	address public activePoolAddress;
	address public treasury;

	// --- Functions ---
	function setAddresses(
		address _monTokenAddress,
		address _dchfTokenAddress,
		address _troveManagerAddress,
		address _troveManagerHelpersAddress,
		address _borrowerOperationsAddress,
		address _activePoolAddress,
		address _treasury
	) external override initializer {
		require(!isInitialized, "Already Initialized");
		require(_treasury != address(0), "Invalid Treausry Address");
		checkContract(_monTokenAddress);
		checkContract(_dchfTokenAddress);
		checkContract(_troveManagerAddress);
		checkContract(_troveManagerHelpersAddress);
		checkContract(_borrowerOperationsAddress);
		checkContract(_activePoolAddress);
		isInitialized = true;
		_pause();

		monToken = IERC20(_monTokenAddress);
		dchfToken = IERC20(_dchfTokenAddress);
		troveManagerAddress = _troveManagerAddress;
		troveManagerHelpersAddress = _troveManagerHelpersAddress;
		borrowerOperationsAddress = _borrowerOperationsAddress;
		activePoolAddress = _activePoolAddress;
		treasury = _treasury;

		isAssetTracked[ETH_REF_ADDRESS] = true;
		ASSET_TYPE.push(ETH_REF_ADDRESS);

		emit MONTokenAddressSet(_monTokenAddress);
		emit MONTokenAddressSet(_dchfTokenAddress);
		emit TroveManagerAddressSet(_troveManagerAddress);
		emit BorrowerOperationsAddressSet(_borrowerOperationsAddress);
		emit ActivePoolAddressSet(_activePoolAddress);
	}

	// If caller has a pre-existing stake, send any accumulated ETH and DCHF gains to them.
	function stake(uint256 _MONamount) external override nonReentrant whenNotPaused {
		require(_MONamount > 0, "MON amount is zero");

		uint256 currentStake = stakes[msg.sender];

		uint256 assetLength = ASSET_TYPE.length;
		uint256 AssetGain;
		address asset;

		for (uint256 i = 0; i < assetLength; i++) {
			asset = ASSET_TYPE[i];

			if (currentStake != 0) {
				AssetGain = _getPendingAssetGain(asset, msg.sender);

				if (i == 0) {
					uint256 DCHFGain = _getPendingDCHFGain(msg.sender);
					dchfToken.safeTransfer(msg.sender, DCHFGain);

					emit StakingGainsDCHFWithdrawn(msg.sender, DCHFGain);
				}

				_sendAssetGainToUser(asset, AssetGain);
				emit StakingGainsAssetWithdrawn(msg.sender, asset, AssetGain);
			}

			_updateUserSnapshots(asset, msg.sender);
		}

		uint256 newStake = currentStake.add(_MONamount);

		// Increase user’s stake and total MON staked
		stakes[msg.sender] = newStake;
		totalMONStaked = totalMONStaked.add(_MONamount);
		emit TotalMONStakedUpdated(totalMONStaked);

		// Transfer MON from caller to this contract
		monToken.safeTransferFrom(msg.sender, address(this), _MONamount);

		emit StakeChanged(msg.sender, newStake);
	}

	// Unstake the MON and send the it back to the caller, along with their accumulated DCHF & ETH gains.
	// If requested amount > stake, send their entire stake.
	function unstake(uint256 _MONamount) external override nonReentrant {
		uint256 currentStake = stakes[msg.sender];
		_requireUserHasStake(currentStake);

		uint256 assetLength = ASSET_TYPE.length;
		uint256 AssetGain;
		address asset;

		for (uint256 i = 0; i < assetLength; i++) {
			asset = ASSET_TYPE[i];

			// Grab any accumulated ETH and DCHF gains from the current stake
			AssetGain = _getPendingAssetGain(asset, msg.sender);

			if (i == 0) {
				uint256 DCHFGain = _getPendingDCHFGain(msg.sender);
				dchfToken.safeTransfer(msg.sender, DCHFGain);
				emit StakingGainsDCHFWithdrawn(msg.sender, DCHFGain);
			}

			_updateUserSnapshots(asset, msg.sender);
			emit StakingGainsAssetWithdrawn(msg.sender, asset, AssetGain);

			_sendAssetGainToUser(asset, AssetGain);
		}

		if (_MONamount > 0) {
			uint256 MONToWithdraw = DfrancMath._min(_MONamount, currentStake);

			uint256 newStake = currentStake.sub(MONToWithdraw);

			// Decrease user's stake and total MON staked
			stakes[msg.sender] = newStake;
			totalMONStaked = totalMONStaked.sub(MONToWithdraw);
			emit TotalMONStakedUpdated(totalMONStaked);

			// Transfer unstaked MON to user
			monToken.safeTransfer(msg.sender, MONToWithdraw);

			emit StakeChanged(msg.sender, newStake);
		}
	}

	function pause() public onlyOwner {
		_pause();
	}

	function unpause() external onlyOwner {
		_unpause();
	}

	function changeTreasuryAddress(address _treasury) public onlyOwner {
		require(_treasury != address(0), "Treasury address is zero");
		treasury = _treasury;
		emit TreasuryAddressChanged(_treasury);
	}

	// --- Reward-per-unit-staked increase functions. Called by Dfranc core contracts ---

	function increaseF_Asset(address _asset, uint256 _AssetFee)
		external
		override
		callerIsTroveManager
	{
		if (paused()) {
			sendToTreasury(_asset, _AssetFee);
			return;
		}

		if (!isAssetTracked[_asset]) {
			isAssetTracked[_asset] = true;
			ASSET_TYPE.push(_asset);
		}

		uint256 AssetFeePerMONStaked;

		if (totalMONStaked > 0) {
			AssetFeePerMONStaked = _AssetFee.mul(DECIMAL_PRECISION).div(totalMONStaked);
		}

		F_ASSETS[_asset] = F_ASSETS[_asset].add(AssetFeePerMONStaked);
		emit F_AssetUpdated(_asset, F_ASSETS[_asset]);
	}

	function increaseF_DCHF(uint256 _DCHFFee) external override callerIsBorrowerOperations {
		if (paused()) {
			sendToTreasury(address(dchfToken), _DCHFFee);
			return;
		}

		uint256 DCHFFeePerMONStaked;

		if (totalMONStaked > 0) {
			DCHFFeePerMONStaked = _DCHFFee.mul(DECIMAL_PRECISION).div(totalMONStaked);
		}

		F_DCHF = F_DCHF.add(DCHFFeePerMONStaked);
		emit F_DCHFUpdated(F_DCHF);
	}

	function sendToTreasury(address _asset, uint256 _amount) internal {
		_sendAsset(treasury, _asset, _amount);
		sentToTreasuryTracker[_asset] += _amount;

		emit SentToTreasury(_asset, _amount);
	}

	// --- Pending reward functions ---

	function getPendingAssetGain(address _asset, address _user)
		external
		view
		override
		returns (uint256)
	{
		return _getPendingAssetGain(_asset, _user);
	}

	function _getPendingAssetGain(address _asset, address _user)
		internal
		view
		returns (uint256)
	{
		uint256 F_ASSET_Snapshot = snapshots[_user].F_ASSET_Snapshot[_asset];
		uint256 AssetGain = stakes[_user].mul(F_ASSETS[_asset].sub(F_ASSET_Snapshot)).div(
			DECIMAL_PRECISION
		);
		return AssetGain;
	}

	function getPendingDCHFGain(address _user) external view override returns (uint256) {
		return _getPendingDCHFGain(_user);
	}

	function _getPendingDCHFGain(address _user) internal view returns (uint256) {
		uint256 F_DCHF_Snapshot = snapshots[_user].F_DCHF_Snapshot;
		uint256 DCHFGain = stakes[_user].mul(F_DCHF.sub(F_DCHF_Snapshot)).div(DECIMAL_PRECISION);
		return DCHFGain;
	}

	// --- Internal helper functions ---

	function _updateUserSnapshots(address _asset, address _user) internal {
		snapshots[_user].F_ASSET_Snapshot[_asset] = F_ASSETS[_asset];
		snapshots[_user].F_DCHF_Snapshot = F_DCHF;
		emit StakerSnapshotsUpdated(_user, F_ASSETS[_asset], F_DCHF);
	}

	function _sendAssetGainToUser(address _asset, uint256 _assetGain) internal {
		_assetGain = SafetyTransfer.decimalsCorrection(_asset, _assetGain);
		_sendAsset(msg.sender, _asset, _assetGain);
		emit AssetSent(_asset, msg.sender, _assetGain);
	}

	function _sendAsset(
		address _sendTo,
		address _asset,
		uint256 _amount
	) internal {
		if (_asset == ETH_REF_ADDRESS) {
			(bool success, ) = _sendTo.call{ value: _amount }("");
			require(success, "MONStaking: Failed to send accumulated AssetGain");
		} else {
			IERC20(_asset).safeTransfer(_sendTo, _amount);
		}
	}

	// --- 'require' functions ---

	modifier callerIsTroveManager() {
		require(
			msg.sender == troveManagerAddress || msg.sender == troveManagerHelpersAddress,
			"MONStaking: caller is not TroveM"
		);
		_;
	}

	modifier callerIsBorrowerOperations() {
		require(msg.sender == borrowerOperationsAddress, "MONStaking: caller is not BorrowerOps");
		_;
	}

	modifier callerIsActivePool() {
		require(msg.sender == activePoolAddress, "MONStaking: caller is not ActivePool");
		_;
	}

	function _requireUserHasStake(uint256 currentStake) internal pure {
		require(currentStake > 0, "MONStaking: User must have a non-zero stake");
	}

	receive() external payable callerIsActivePool {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // 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-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @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) {
        return a + b;
    }

    /**
     * @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) {
        return a - b;
    }

    /**
     * @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) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message 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,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT

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() {
        _setOwner(_msgSender());
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;

abstract contract BaseMath {
	uint256 public constant DECIMAL_PRECISION = 1 ether;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.14;

contract CheckContract {
	function checkContract(address _account) internal view {
		require(_account != address(0), "Account cannot be zero address");

		uint256 size;
		assembly {
			size := extcodesize(_account)
		}
		require(size > 0, "Account code size cannot be zero");
	}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.14;
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

library DfrancMath {
	using SafeMath for uint256;

	uint256 internal constant DECIMAL_PRECISION = 1 ether;

	/* Precision for Nominal ICR (independent of price). Rationale for the value:
	 *
	 * - Making it “too high” could lead to overflows.
	 * - Making it “too low” could lead to an ICR equal to zero, due to truncation from Solidity floor division.
	 *
	 * This value of 1e20 is chosen for safety: the NICR will only overflow for numerator > ~1e39 ETH,
	 * and will only truncate to 0 if the denominator is at least 1e20 times greater than the numerator.
	 *
	 */
	uint256 internal constant NICR_PRECISION = 1e20;

	function _min(uint256 _a, uint256 _b) internal pure returns (uint256) {
		return (_a < _b) ? _a : _b;
	}

	function _max(uint256 _a, uint256 _b) internal pure returns (uint256) {
		return (_a >= _b) ? _a : _b;
	}

	/*
	 * Multiply two decimal numbers and use normal rounding rules:
	 * -round product up if 19'th mantissa digit >= 5
	 * -round product down if 19'th mantissa digit < 5
	 *
	 * Used only inside the exponentiation, _decPow().
	 */
	function decMul(uint256 x, uint256 y) internal pure returns (uint256 decProd) {
		uint256 prod_xy = x.mul(y);

		decProd = prod_xy.add(DECIMAL_PRECISION / 2).div(DECIMAL_PRECISION);
	}

	/*
	 * _decPow: Exponentiation function for 18-digit decimal base, and integer exponent n.
	 *
	 * Uses the efficient "exponentiation by squaring" algorithm. O(log(n)) complexity.
	 *
	 * Called by two functions that represent time in units of minutes:
	 * 1) TroveManager._calcDecayedBaseRate
	 * 2) CommunityIssuance._getCumulativeIssuanceFraction
	 *
	 * The exponent is capped to avoid reverting due to overflow. The cap 525600000 equals
	 * "minutes in 1000 years": 60 * 24 * 365 * 1000
	 *
	 * If a period of > 1000 years is ever used as an exponent in either of the above functions, the result will be
	 * negligibly different from just passing the cap, since:
	 *
	 * In function 1), the decayed base rate will be 0 for 1000 years or > 1000 years
	 * In function 2), the difference in tokens issued at 1000 years and any time > 1000 years, will be negligible
	 */
	function _decPow(uint256 _base, uint256 _minutes) internal pure returns (uint256) {
		if (_minutes > 525600000) {
			_minutes = 525600000;
		} // cap to avoid overflow

		if (_minutes == 0) {
			return DECIMAL_PRECISION;
		}

		uint256 y = DECIMAL_PRECISION;
		uint256 x = _base;
		uint256 n = _minutes;

		// Exponentiation-by-squaring
		while (n > 1) {
			if (n % 2 == 0) {
				x = decMul(x, x);
				n = n.div(2);
			} else {
				// if (n % 2 != 0)
				y = decMul(x, y);
				x = decMul(x, x);
				n = (n.sub(1)).div(2);
			}
		}

		return decMul(x, y);
	}

	function _getAbsoluteDifference(uint256 _a, uint256 _b) internal pure returns (uint256) {
		return (_a >= _b) ? _a.sub(_b) : _b.sub(_a);
	}

	function _computeNominalCR(uint256 _coll, uint256 _debt) internal pure returns (uint256) {
		if (_debt > 0) {
			return _coll.mul(NICR_PRECISION).div(_debt);
		}
		// Return the maximal value for uint256 if the Trove has a debt of 0. Represents "infinite" CR.
		else {
			// if (_debt == 0)
			return 2**256 - 1;
		}
	}

	function _computeCR(
		uint256 _coll,
		uint256 _debt,
		uint256 _price
	) internal pure returns (uint256) {
		if (_debt > 0) {

			return _coll.mul(_price).div(_debt);
		}
		// Return the maximal value for uint256 if the Trove has a debt of 0. Represents "infinite" CR.
		else {
			// if (_debt == 0)
			return type(uint256).max;
		}
	}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

import "@openzeppelin/contracts/utils/Address.sol";

abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

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

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

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

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

    /**
     * @dev Internal function that returns the initialized version. Returns `_initialized`
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `_initializing`
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.14;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

interface IMONStaking {
	// --- Events --

	event TreasuryAddressChanged(address _treausury);
	event SentToTreasury(address indexed _asset, uint256 _amount);
	event MONTokenAddressSet(address _MONTokenAddress);
	event DCHFTokenAddressSet(address _dchfTokenAddress);
	event TroveManagerAddressSet(address _troveManager);
	event BorrowerOperationsAddressSet(address _borrowerOperationsAddress);
	event ActivePoolAddressSet(address _activePoolAddress);

	event StakeChanged(address indexed staker, uint256 newStake);
	event StakingGainsAssetWithdrawn(
		address indexed staker,
		address indexed asset,
		uint256 AssetGain
	);
	event StakingGainsDCHFWithdrawn(address indexed staker, uint256 DCHFGain);
	event F_AssetUpdated(address indexed _asset, uint256 _F_ASSET);
	event F_DCHFUpdated(uint256 _F_DCHF);
	event TotalMONStakedUpdated(uint256 _totalMONStaked);
	event AssetSent(address indexed _asset, address indexed _account, uint256 _amount);
	event StakerSnapshotsUpdated(address _staker, uint256 _F_Asset, uint256 _F_DCHF);

	function monToken() external view returns (IERC20);

	// --- Functions ---

	function setAddresses(
		address _MONTokenAddress,
		address _dchfTokenAddress,
		address _troveManagerAddress,
		address _troveManagerHelpersAddress,
		address _borrowerOperationsAddress,
		address _activePoolAddress,
		address _treasury
	) external;

	function stake(uint256 _MONamount) external;

	function unstake(uint256 _MONamount) external;

	function increaseF_Asset(address _asset, uint256 _AssetFee) external;

	function increaseF_DCHF(uint256 _MONFee) external;

	function getPendingAssetGain(address _asset, address _user) external view returns (uint256);

	function getPendingDCHFGain(address _user) external view returns (uint256);
}

pragma solidity ^0.8.14;

interface IDeposit {
	function receivedERC20(address _asset, uint256 _amount) external;
}

import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "./ERC20Decimals.sol";

library SafetyTransfer {
	using SafeMath for uint256;

	//_amount is in ether (1e18) and we want to convert it to the token decimal
	function decimalsCorrection(address _token, uint256 _amount)
		internal
		view
		returns (uint256)
	{
		if (_token == address(0)) return _amount;
		if (_amount == 0) return 0;

		uint8 decimals = ERC20Decimals(_token).decimals();
		if (decimals < 18) {
			return _amount.div(10**(18 - decimals));
		} else {
			return _amount.mul(10**(decimals - 18));
		}
	}
}

// SPDX-License-Identifier: MIT

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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.14;

interface ERC20Decimals {
	function decimals() external view returns (uint8);
}

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

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