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// SPDX-License-Identifier: ISC
pragma solidity 0.8.17;

import "./CvxStableMetapoolCollateral.sol";

/**
 * @title CvxStableRTokenMetapoolCollateral
 *  This plugin contract is intended for 2-token stable metapools that
 *  involve RTokens, such as eUSD-fraxBP.
 *
 * tok = ConvexStakingWrapper(cvxPairedUSDRToken/USDBasePool)
 * ref = PairedUSDRToken/USDBasePool pool invariant
 * tar = USD
 * UoA = USD
 */
contract CvxStableRTokenMetapoolCollateral is CvxStableMetapoolCollateral {
    using FixLib for uint192;

    IAssetRegistry internal immutable reg; // AssetRegistry of pairedToken

    /// @param config.chainlinkFeed Feed units: {UoA/pairedTok}
    /// @dev config.chainlinkFeed/oracleError/oracleTimeout are unused; set chainlinkFeed to 0x1
    /// @dev config.erc20 should be a IConvexStakingWrapper
    constructor(
        CollateralConfig memory config,
        uint192 revenueHiding,
        PTConfiguration memory ptConfig,
        ICurveMetaPool metapoolToken_,
        uint192 pairedTokenDefaultThreshold_
    )
        CvxStableMetapoolCollateral(
            config,
            revenueHiding,
            ptConfig,
            metapoolToken_,
            pairedTokenDefaultThreshold_
        )
    {
        reg = IRToken(address(pairedToken)).main().assetRegistry();
    }

    /// Can revert, used by `_anyDepeggedOutsidePool()`
    /// Should not return FIX_MAX for low
    /// @return lowPaired {UoA/pairedTok} The low price estimate of the paired token
    /// @return highPaired {UoA/pairedTok} The high price estimate of the paired token
    function tryPairedPrice()
        public
        view
        virtual
        override
        returns (uint192 lowPaired, uint192 highPaired)
    {
        return reg.toAsset(pairedToken).price();
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

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

  function version() external view returns (uint256);

  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. It the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`.
        // We also know that `k`, the position of the most significant bit, is such that `msb(a) = 2**k`.
        // This gives `2**k < a <= 2**(k+1)` → `2**(k/2) <= sqrt(a) < 2 ** (k/2+1)`.
        // Using an algorithm similar to the msb conmputation, we are able to compute `result = 2**(k/2)` which is a
        // good first aproximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1;
        uint256 x = a;
        if (x >> 128 > 0) {
            x >>= 128;
            result <<= 64;
        }
        if (x >> 64 > 0) {
            x >>= 64;
            result <<= 32;
        }
        if (x >> 32 > 0) {
            x >>= 32;
            result <<= 16;
        }
        if (x >> 16 > 0) {
            x >>= 16;
            result <<= 8;
        }
        if (x >> 8 > 0) {
            x >>= 8;
            result <<= 4;
        }
        if (x >> 4 > 0) {
            x >>= 4;
            result <<= 2;
        }
        if (x >> 2 > 0) {
            result <<= 1;
        }

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        uint256 result = sqrt(a);
        if (rounding == Rounding.Up && result * result < a) {
            result += 1;
        }
        return result;
    }
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "../libraries/Fixed.sol";
import "./IMain.sol";
import "./IRewardable.sol";

/**
 * @title IAsset
 * @notice Supertype. Any token that interacts with our system must be wrapped in an asset,
 * whether it is used as RToken backing or not. Any token that can report a price in the UoA
 * is eligible to be an asset.
 */
interface IAsset is IRewardable {
    /// Refresh saved price
    /// The Reserve protocol calls this at least once per transaction, before relying on
    /// the Asset's other functions.
    /// @dev Called immediately after deployment, before use
    function refresh() external;

    /// Should not revert
    /// @return low {UoA/tok} The lower end of the price estimate
    /// @return high {UoA/tok} The upper end of the price estimate
    function price() external view returns (uint192 low, uint192 high);

    /// Should not revert
    /// lotLow should be nonzero when the asset might be worth selling
    /// @return lotLow {UoA/tok} The lower end of the lot price estimate
    /// @return lotHigh {UoA/tok} The upper end of the lot price estimate
    function lotPrice() external view returns (uint192 lotLow, uint192 lotHigh);

    /// @return {tok} The balance of the ERC20 in whole tokens
    function bal(address account) external view returns (uint192);

    /// @return The ERC20 contract of the token with decimals() available
    function erc20() external view returns (IERC20Metadata);

    /// @return The number of decimals in the ERC20; just for gas optimization
    function erc20Decimals() external view returns (uint8);

    /// @return If the asset is an instance of ICollateral or not
    function isCollateral() external view returns (bool);

    /// @param {UoA} The max trade volume, in UoA
    function maxTradeVolume() external view returns (uint192);
}

// Used only in Testing. Strictly speaking an Asset does not need to adhere to this interface
interface TestIAsset is IAsset {
    /// @return The address of the chainlink feed
    function chainlinkFeed() external view returns (AggregatorV3Interface);

    /// {1} The max % deviation allowed by the oracle
    function oracleError() external view returns (uint192);

    /// @return {s} Seconds that an oracle value is considered valid
    function oracleTimeout() external view returns (uint48);

    /// @return {s} Seconds that the lotPrice should decay over, after stale price
    function priceTimeout() external view returns (uint48);
}

/// CollateralStatus must obey a linear ordering. That is:
/// - being DISABLED is worse than being IFFY, or SOUND
/// - being IFFY is worse than being SOUND.
enum CollateralStatus {
    SOUND,
    IFFY, // When a peg is not holding or a chainlink feed is stale
    DISABLED // When the collateral has completely defaulted
}

/// Upgrade-safe maximum operator for CollateralStatus
library CollateralStatusComparator {
    /// @return Whether a is worse than b
    function worseThan(CollateralStatus a, CollateralStatus b) internal pure returns (bool) {
        return uint256(a) > uint256(b);
    }
}

/**
 * @title ICollateral
 * @notice A subtype of Asset that consists of the tokens eligible to back the RToken.
 */
interface ICollateral is IAsset {
    /// Emitted whenever the collateral status is changed
    /// @param newStatus The old CollateralStatus
    /// @param newStatus The updated CollateralStatus
    event CollateralStatusChanged(
        CollateralStatus indexed oldStatus,
        CollateralStatus indexed newStatus
    );

    /// @dev refresh()
    /// Refresh exchange rates and update default status.
    /// VERY IMPORTANT: In any valid implemntation, status() MUST become DISABLED in refresh() if
    /// refPerTok() has ever decreased since last call.

    /// @return The canonical name of this collateral's target unit.
    function targetName() external view returns (bytes32);

    /// @return The status of this collateral asset. (Is it defaulting? Might it soon?)
    function status() external view returns (CollateralStatus);

    // ==== Exchange Rates ====

    /// @return {ref/tok} Quantity of whole reference units per whole collateral tokens
    function refPerTok() external view returns (uint192);

    /// @return {target/ref} Quantity of whole target units per whole reference unit in the peg
    function targetPerRef() external view returns (uint192);
}

// Used only in Testing. Strictly speaking a Collateral does not need to adhere to this interface
interface TestICollateral is TestIAsset, ICollateral {
    /// @return The epoch timestamp when the collateral will default from IFFY to DISABLED
    function whenDefault() external view returns (uint256);

    /// @return The amount of time a collateral must be in IFFY status until being DISABLED
    function delayUntilDefault() external view returns (uint48);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IAsset.sol";
import "./IComponent.sol";

/// A serialization of the AssetRegistry to be passed around in the P1 impl for gas optimization
struct Registry {
    IERC20[] erc20s;
    IAsset[] assets;
}

/**
 * @title IAssetRegistry
 * @notice The AssetRegistry is in charge of maintaining the ERC20 tokens eligible
 *   to be handled by the rest of the system. If an asset is in the registry, this means:
 *      1. Its ERC20 contract has been vetted
 *      2. The asset is the only asset for that ERC20
 *      3. The asset can be priced in the UoA, usually via an oracle
 */
interface IAssetRegistry is IComponent {
    /// Emitted when an asset is added to the registry
    /// @param erc20 The ERC20 contract for the asset
    /// @param asset The asset contract added to the registry
    event AssetRegistered(IERC20 indexed erc20, IAsset indexed asset);

    /// Emitted when an asset is removed from the registry
    /// @param erc20 The ERC20 contract for the asset
    /// @param asset The asset contract removed from the registry
    event AssetUnregistered(IERC20 indexed erc20, IAsset indexed asset);

    // Initialization
    function init(IMain main_, IAsset[] memory assets_) external;

    /// Fully refresh all asset state
    /// @custom:interaction
    function refresh() external;

    /// @return The corresponding asset for ERC20, or reverts if not registered
    function toAsset(IERC20 erc20) external view returns (IAsset);

    /// @return The corresponding collateral, or reverts if unregistered or not collateral
    function toColl(IERC20 erc20) external view returns (ICollateral);

    /// @return If the ERC20 is registered
    function isRegistered(IERC20 erc20) external view returns (bool);

    /// @return A list of all registered ERC20s
    function erc20s() external view returns (IERC20[] memory);

    /// @return reg The list of registered ERC20s and Assets, in the same order
    function getRegistry() external view returns (Registry memory reg);

    function register(IAsset asset) external returns (bool);

    function swapRegistered(IAsset asset) external returns (bool swapped);

    function unregister(IAsset asset) external;
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IComponent.sol";
import "./ITrading.sol";

/**
 * @title IBackingManager
 * @notice The BackingManager handles changes in the ERC20 balances that back an RToken.
 *   - It computes which trades to perform, if any, and initiates these trades with the Broker.
 *   - If already collateralized, excess assets are transferred to RevenueTraders.
 *
 * `manageTokens(erc20s)` and `manageTokensSortedOrder(erc20s)` are handles for getting at the
 *   same underlying functionality. The former allows an ERC20 list in any order, while the
 *   latter requires a sorted array, and executes in O(n) rather than O(n^2) time. In the
 *   vast majority of cases we expect the the O(n^2) function to be acceptable.
 */
interface IBackingManager is IComponent, ITrading {
    event TradingDelaySet(uint48 indexed oldVal, uint48 indexed newVal);
    event BackingBufferSet(uint192 indexed oldVal, uint192 indexed newVal);

    // Initialization
    function init(
        IMain main_,
        uint48 tradingDelay_,
        uint192 backingBuffer_,
        uint192 maxTradeSlippage_,
        uint192 minTradeVolume_
    ) external;

    // Give RToken max allowance over a registered token
    /// @custom:refresher
    /// @custom:interaction
    function grantRTokenAllowance(IERC20) external;

    /// Maintain the overall backing policy; handout assets otherwise
    /// @dev Performs a uniqueness check on the erc20s list in O(n^2)
    /// @custom:interaction
    function manageTokens(IERC20[] memory erc20s) external;

    /// Maintain the overall backing policy; handout assets otherwise
    /// @dev Tokens must be in sorted order!
    /// @dev Performs a uniqueness check on the erc20s list in O(n)
    /// @custom:interaction
    function manageTokensSortedOrder(IERC20[] memory erc20s) external;
}

interface TestIBackingManager is IBackingManager, TestITrading {
    function tradingDelay() external view returns (uint48);

    function backingBuffer() external view returns (uint192);

    function setTradingDelay(uint48 val) external;

    function setBackingBuffer(uint192 val) external;
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../libraries/Fixed.sol";
import "./IAsset.sol";
import "./IComponent.sol";

struct BasketRange {
    uint192 bottom; // {BU}
    uint192 top; // {BU}
}

/**
 * @title IBasketHandler
 * @notice The BasketHandler aims to maintain a reference basket of constant target unit amounts.
 * When a collateral token defaults, a new reference basket of equal target units is set.
 * When _all_ collateral tokens default for a target unit, only then is the basket allowed to fall
 *   in terms of target unit amounts. The basket is considered defaulted in this case.
 */
interface IBasketHandler is IComponent {
    /// Emitted when the prime basket is set
    /// @param erc20s The collateral tokens for the prime basket
    /// @param targetAmts {target/BU} A list of quantities of target unit per basket unit
    /// @param targetNames Each collateral token's targetName
    event PrimeBasketSet(IERC20[] erc20s, uint192[] targetAmts, bytes32[] targetNames);

    /// Emitted when the reference basket is set
    /// @param nonce The basket nonce
    /// @param erc20s The list of collateral tokens in the reference basket
    /// @param refAmts {ref/BU} The reference amounts of the basket collateral tokens
    /// @param disabled True when the list of erc20s + refAmts may not be correct
    event BasketSet(uint256 indexed nonce, IERC20[] erc20s, uint192[] refAmts, bool disabled);

    /// Emitted when a backup config is set for a target unit
    /// @param targetName The name of the target unit as a bytes32
    /// @param max The max number to use from `erc20s`
    /// @param erc20s The set of backup collateral tokens
    event BackupConfigSet(bytes32 indexed targetName, uint256 indexed max, IERC20[] erc20s);

    // Initialization
    function init(IMain main_) external;

    /// Set the prime basket
    /// @param erc20s The collateral tokens for the new prime basket
    /// @param targetAmts The target amounts (in) {target/BU} for the new prime basket
    ///                   required range: 1e9 values; absolute range irrelevant.
    /// @custom:governance
    function setPrimeBasket(IERC20[] memory erc20s, uint192[] memory targetAmts) external;

    /// Set the backup configuration for a given target
    /// @param targetName The name of the target as a bytes32
    /// @param max The maximum number of collateral tokens to use from this target
    ///            Required range: 1-255
    /// @param erc20s A list of ordered backup collateral tokens
    /// @custom:governance
    function setBackupConfig(
        bytes32 targetName,
        uint256 max,
        IERC20[] calldata erc20s
    ) external;

    /// Default the basket in order to schedule a basket refresh
    /// @custom:protected
    function disableBasket() external;

    /// Governance-controlled setter to cause a basket switch explicitly
    /// @custom:governance
    /// @custom:interaction
    function refreshBasket() external;

    /// @return If the BackingManager has sufficient collateral to redeem the entire RToken supply
    function fullyCollateralized() external view returns (bool);

    /// @return status The worst CollateralStatus of all collateral in the basket
    function status() external view returns (CollateralStatus status);

    /// @param erc20 The ERC20 token contract for the asset
    /// @return {tok/BU} The whole token quantity of token in the reference basket
    /// Returns 0 if erc20 is not registered or not in the basket
    /// Returns FIX_MAX (in lieu of +infinity) if Collateral.refPerTok() is 0.
    /// Otherwise, returns (token's basket.refAmts / token's Collateral.refPerTok())
    function quantity(IERC20 erc20) external view returns (uint192);

    /// Like quantity(), but unsafe because it DOES NOT CONFIRM THAT THE ASSET IS CORRECT
    /// @param erc20 The ERC20 token contract for the asset
    /// @param asset The registered asset plugin contract for the erc20
    /// @return {tok/BU} The whole token quantity of token in the reference basket
    /// Returns 0 if erc20 is not registered or not in the basket
    /// Returns FIX_MAX (in lieu of +infinity) if Collateral.refPerTok() is 0.
    /// Otherwise, returns (token's basket.refAmts / token's Collateral.refPerTok())
    function quantityUnsafe(IERC20 erc20, IAsset asset) external view returns (uint192);

    /// @param amount {BU}
    /// @return erc20s The addresses of the ERC20 tokens in the reference basket
    /// @return quantities {qTok} The quantity of each ERC20 token to issue `amount` baskets
    function quote(uint192 amount, RoundingMode rounding)
        external
        view
        returns (address[] memory erc20s, uint256[] memory quantities);

    /// @return top {BU} The number of partial basket units: e.g max(coll.map((c) => c.balAsBUs())
    ///         bottom {BU} The number of whole basket units held by the account
    function basketsHeldBy(address account) external view returns (BasketRange memory);

    /// Should not revert
    /// @return low {UoA/BU} The lower end of the price estimate
    /// @return high {UoA/BU} The upper end of the price estimate
    function price() external view returns (uint192 low, uint192 high);

    /// Should not revert
    /// lotLow should be nonzero if a BU could be worth selling
    /// @return lotLow {UoA/tok} The lower end of the lot price estimate
    /// @return lotHigh {UoA/tok} The upper end of the lot price estimate
    function lotPrice() external view returns (uint192 lotLow, uint192 lotHigh);

    /// @return timestamp The timestamp at which the basket was last set
    function timestamp() external view returns (uint48);

    /// @return The current basket nonce, regardless of status
    function nonce() external view returns (uint48);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "./IAsset.sol";
import "./IComponent.sol";
import "./IGnosis.sol";
import "./ITrade.sol";

/// The data format that describes a request for trade with the Broker
struct TradeRequest {
    IAsset sell;
    IAsset buy;
    uint256 sellAmount; // {qSellTok}
    uint256 minBuyAmount; // {qBuyTok}
}

/**
 * @title IBroker
 * @notice The Broker deploys oneshot Trade contracts for Traders and monitors
 *   the continued proper functioning of trading platforms.
 */
interface IBroker is IComponent {
    event GnosisSet(IGnosis indexed oldVal, IGnosis indexed newVal);
    event TradeImplementationSet(ITrade indexed oldVal, ITrade indexed newVal);
    event AuctionLengthSet(uint48 indexed oldVal, uint48 indexed newVal);
    event DisabledSet(bool indexed prevVal, bool indexed newVal);

    // Initialization
    function init(
        IMain main_,
        IGnosis gnosis_,
        ITrade tradeImplementation_,
        uint48 auctionLength_
    ) external;

    /// Request a trade from the broker
    /// @dev Requires setting an allowance in advance
    /// @custom:interaction
    function openTrade(TradeRequest memory req) external returns (ITrade);

    /// Only callable by one of the trading contracts the broker deploys
    function reportViolation() external;

    function disabled() external view returns (bool);
}

interface TestIBroker is IBroker {
    function gnosis() external view returns (IGnosis);

    function tradeImplementation() external view returns (ITrade);

    function auctionLength() external view returns (uint48);

    function setGnosis(IGnosis newGnosis) external;

    function setTradeImplementation(ITrade newTradeImplementation) external;

    function setAuctionLength(uint48 newAuctionLength) external;

    function setDisabled(bool disabled_) external;
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "./IMain.sol";
import "./IVersioned.sol";

/**
 * @title IComponent
 * @notice A Component is the central building block of all our system contracts. Components
 *   contain important state that must be migrated during upgrades, and they delegate
 *   their ownership to Main's owner.
 */
interface IComponent is IVersioned {
    function main() external view returns (IMain);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

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

struct RevenueShare {
    uint16 rTokenDist; // {revShare} A value between [0, 10,000]
    uint16 rsrDist; // {revShare} A value between [0, 10,000]
}

/// Assumes no more than 1024 independent distributions.
struct RevenueTotals {
    uint24 rTokenTotal; // {revShare}
    uint24 rsrTotal; // {revShare}
}

/**
 * @title IDistributor
 * @notice The Distributor Component maintains a revenue distribution table that dictates
 *   how to divide revenue across the Furnace, StRSR, and any other destinations.
 */
interface IDistributor is IComponent {
    /// Emitted when a distribution is set
    /// @param dest The address set to receive the distribution
    /// @param rTokenDist The distribution of RToken that should go to `dest`
    /// @param rsrDist The distribution of RSR that should go to `dest`
    event DistributionSet(address dest, uint16 rTokenDist, uint16 rsrDist);

    /// Emitted when revenue is distributed
    /// @param erc20 The token being distributed, either RSR or the RToken itself
    /// @param source The address providing the revenue
    /// @param amount The amount of the revenue
    event RevenueDistributed(IERC20 indexed erc20, address indexed source, uint256 indexed amount);

    // Initialization
    function init(IMain main_, RevenueShare memory dist) external;

    /// @custom:governance
    function setDistribution(address dest, RevenueShare memory share) external;

    /// Distribute the `erc20` token across all revenue destinations
    /// @custom:interaction
    function distribute(IERC20 erc20, uint256 amount) external;

    /// @return revTotals The total of all  destinations
    function totals() external view returns (RevenueTotals memory revTotals);
}

interface TestIDistributor is IDistributor {
    // solhint-disable-next-line func-name-mixedcase
    function FURNACE() external view returns (address);

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

    /// @return rTokenDist The RToken distribution for the address
    /// @return rsrDist The RSR distribution for the address
    function distribution(address) external view returns (uint16 rTokenDist, uint16 rsrDist);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "../libraries/Fixed.sol";
import "./IComponent.sol";

/**
 * @title IFurnace
 * @notice A helper contract to burn RTokens slowly and permisionlessly.
 */
interface IFurnace is IComponent {
    // Initialization
    function init(IMain main_, uint192 ratio_) external;

    /// Emitted when the melting ratio is changed
    /// @param oldRatio The old ratio
    /// @param newRatio The new ratio
    event RatioSet(uint192 indexed oldRatio, uint192 indexed newRatio);

    function ratio() external view returns (uint192);

    ///    Needed value range: [0, 1], granularity 1e-9
    /// @custom:governance
    function setRatio(uint192) external;

    /// Performs any RToken melting that has vested since the last payout.
    /// @custom:refresher
    function melt() external;
}

interface TestIFurnace is IFurnace {
    function lastPayout() external view returns (uint256);

    function lastPayoutBal() external view returns (uint256);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

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

struct GnosisAuctionData {
    IERC20 auctioningToken;
    IERC20 biddingToken;
    uint256 orderCancellationEndDate;
    uint256 auctionEndDate;
    bytes32 initialAuctionOrder;
    uint256 minimumBiddingAmountPerOrder;
    uint256 interimSumBidAmount;
    bytes32 interimOrder;
    bytes32 clearingPriceOrder;
    uint96 volumeClearingPriceOrder;
    bool minFundingThresholdNotReached;
    bool isAtomicClosureAllowed;
    uint256 feeNumerator;
    uint256 minFundingThreshold;
}

/// The relevant portion of the interface of the live Gnosis EasyAuction contract
/// https://github.com/gnosis/ido-contracts/blob/main/contracts/EasyAuction.sol
interface IGnosis {
    function initiateAuction(
        IERC20 auctioningToken,
        IERC20 biddingToken,
        uint256 orderCancellationEndDate,
        uint256 auctionEndDate,
        uint96 auctionedSellAmount,
        uint96 minBuyAmount,
        uint256 minimumBiddingAmountPerOrder,
        uint256 minFundingThreshold,
        bool isAtomicClosureAllowed,
        address accessManagerContract,
        bytes memory accessManagerContractData
    ) external returns (uint256 auctionId);

    function auctionData(uint256 auctionId) external view returns (GnosisAuctionData memory);

    /// @param auctionId The external auction id
    /// @dev See here for decoding: https://git.io/JMang
    /// @return encodedOrder The order, encoded in a bytes 32
    function settleAuction(uint256 auctionId) external returns (bytes32 encodedOrder);

    /// @return The numerator over a 1000-valued denominator
    function feeNumerator() external returns (uint256);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts-upgradeable/access/IAccessControlUpgradeable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IAssetRegistry.sol";
import "./IBasketHandler.sol";
import "./IBackingManager.sol";
import "./IBroker.sol";
import "./IGnosis.sol";
import "./IFurnace.sol";
import "./IDistributor.sol";
import "./IRToken.sol";
import "./IRevenueTrader.sol";
import "./IStRSR.sol";
import "./ITrading.sol";
import "./IVersioned.sol";

// === Auth roles ===

bytes32 constant OWNER = bytes32(bytes("OWNER"));
bytes32 constant SHORT_FREEZER = bytes32(bytes("SHORT_FREEZER"));
bytes32 constant LONG_FREEZER = bytes32(bytes("LONG_FREEZER"));
bytes32 constant PAUSER = bytes32(bytes("PAUSER"));

/**
 * Main is a central hub that maintains a list of Component contracts.
 *
 * Components:
 *   - perform a specific function
 *   - defer auth to Main
 *   - usually (but not always) contain sizeable state that require a proxy
 */
struct Components {
    // Definitely need proxy
    IRToken rToken;
    IStRSR stRSR;
    IAssetRegistry assetRegistry;
    IBasketHandler basketHandler;
    IBackingManager backingManager;
    IDistributor distributor;
    IFurnace furnace;
    IBroker broker;
    IRevenueTrader rsrTrader;
    IRevenueTrader rTokenTrader;
}

interface IAuth is IAccessControlUpgradeable {
    /// Emitted when `unfreezeAt` is changed
    /// @param oldVal The old value of `unfreezeAt`
    /// @param newVal The new value of `unfreezeAt`
    event UnfreezeAtSet(uint48 indexed oldVal, uint48 indexed newVal);

    /// Emitted when the short freeze duration governance param is changed
    /// @param oldDuration The old short freeze duration
    /// @param newDuration The new short freeze duration
    event ShortFreezeDurationSet(uint48 indexed oldDuration, uint48 indexed newDuration);

    /// Emitted when the long freeze duration governance param is changed
    /// @param oldDuration The old long freeze duration
    /// @param newDuration The new long freeze duration
    event LongFreezeDurationSet(uint48 indexed oldDuration, uint48 indexed newDuration);

    /// Emitted when the system is paused or unpaused
    /// @param oldVal The old value of `paused`
    /// @param newVal The new value of `paused`
    event PausedSet(bool indexed oldVal, bool indexed newVal);

    /**
     * Paused: Disable everything except for OWNER actions, RToken.redeem, StRSR.stake,
     * and StRSR.payoutRewards
     * Frozen: Disable everything except for OWNER actions + StRSR.stake (for governance)
     */

    function pausedOrFrozen() external view returns (bool);

    function frozen() external view returns (bool);

    function shortFreeze() external view returns (uint48);

    function longFreeze() external view returns (uint48);

    // ====

    // onlyRole(OWNER)
    function freezeForever() external;

    // onlyRole(SHORT_FREEZER)
    function freezeShort() external;

    // onlyRole(LONG_FREEZER)
    function freezeLong() external;

    // onlyRole(OWNER)
    function unfreeze() external;

    function pause() external;

    function unpause() external;
}

interface IComponentRegistry {
    // === Component setters/getters ===

    event RTokenSet(IRToken indexed oldVal, IRToken indexed newVal);

    function rToken() external view returns (IRToken);

    event StRSRSet(IStRSR indexed oldVal, IStRSR indexed newVal);

    function stRSR() external view returns (IStRSR);

    event AssetRegistrySet(IAssetRegistry indexed oldVal, IAssetRegistry indexed newVal);

    function assetRegistry() external view returns (IAssetRegistry);

    event BasketHandlerSet(IBasketHandler indexed oldVal, IBasketHandler indexed newVal);

    function basketHandler() external view returns (IBasketHandler);

    event BackingManagerSet(IBackingManager indexed oldVal, IBackingManager indexed newVal);

    function backingManager() external view returns (IBackingManager);

    event DistributorSet(IDistributor indexed oldVal, IDistributor indexed newVal);

    function distributor() external view returns (IDistributor);

    event RSRTraderSet(IRevenueTrader indexed oldVal, IRevenueTrader indexed newVal);

    function rsrTrader() external view returns (IRevenueTrader);

    event RTokenTraderSet(IRevenueTrader indexed oldVal, IRevenueTrader indexed newVal);

    function rTokenTrader() external view returns (IRevenueTrader);

    event FurnaceSet(IFurnace indexed oldVal, IFurnace indexed newVal);

    function furnace() external view returns (IFurnace);

    event BrokerSet(IBroker indexed oldVal, IBroker indexed newVal);

    function broker() external view returns (IBroker);
}

/**
 * @title IMain
 * @notice The central hub for the entire system. Maintains components and an owner singleton role
 */
interface IMain is IVersioned, IAuth, IComponentRegistry {
    function poke() external; // not used in p1

    // === Initialization ===

    event MainInitialized();

    function init(
        Components memory components,
        IERC20 rsr_,
        uint48 shortFreeze_,
        uint48 longFreeze_
    ) external;

    function rsr() external view returns (IERC20);
}

interface TestIMain is IMain {
    /// @custom:governance
    function setShortFreeze(uint48) external;

    /// @custom:governance
    function setLongFreeze(uint48) external;

    function shortFreeze() external view returns (uint48);

    function longFreeze() external view returns (uint48);

    function longFreezes(address account) external view returns (uint256);

    function paused() external view returns (bool);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "./IComponent.sol";
import "./ITrading.sol";

/**
 * @title IRevenueTrader
 * @notice The RevenueTrader is an extension of the trading mixin that trades all
 *   assets at its address for a single target asset. There are two runtime instances
 *   of the RevenueTrader, 1 for RToken and 1 for RSR.
 */
interface IRevenueTrader is IComponent, ITrading {
    // Initialization
    function init(
        IMain main_,
        IERC20 tokenToBuy_,
        uint192 maxTradeSlippage_,
        uint192 minTradeVolume_
    ) external;

    /// Processes a single token; unpermissioned
    /// @dev Intended to be used with multicall
    /// @custom:interaction
    function manageToken(IERC20 sell) external;
}

// solhint-disable-next-line no-empty-blocks
interface TestIRevenueTrader is IRevenueTrader, TestITrading {
    function tokenToBuy() external view returns (IERC20);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IComponent.sol";
import "./IMain.sol";

/**
 * @title IRewardable
 * @notice A simple interface mixin to support claiming of rewards.
 */
interface IRewardable {
    /// Emitted whenever a reward token balance is claimed
    event RewardsClaimed(IERC20 indexed erc20, uint256 indexed amount);

    /// Claim rewards earned by holding a balance of the ERC20 token
    /// Must emit `RewardsClaimed` for each token rewards are claimed for
    /// @dev delegatecall: there be dragons here!
    /// @custom:interaction
    function claimRewards() external;
}

/**
 * @title IRewardableComponent
 * @notice A simple interface mixin to support claiming of rewards.
 */
interface IRewardableComponent is IRewardable {
    /// Claim rewards for a single ERC20
    /// Must emit `RewardsClaimed` for each token rewards are claimed for
    /// @dev delegatecall: there be dragons here!
    /// @custom:interaction
    function claimRewardsSingle(IERC20 erc20) external;
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
// solhint-disable-next-line max-line-length
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-IERC20PermitUpgradeable.sol";
import "../libraries/Fixed.sol";
import "../libraries/Throttle.sol";
import "./IAsset.sol";
import "./IComponent.sol";
import "./IMain.sol";
import "./IRewardable.sol";

/**
 * @title IRToken
 * @notice An RToken is an ERC20 that is permissionlessly issuable/redeemable and tracks an
 *   exchange rate against a single unit: baskets, or {BU} in our type notation.
 */
interface IRToken is IComponent, IERC20MetadataUpgradeable, IERC20PermitUpgradeable {
    /// Emitted when an issuance of RToken occurs, whether it occurs via slow minting or not
    /// @param issuer The address holding collateral tokens
    /// @param recipient The address of the recipient of the RTokens
    /// @param amount The quantity of RToken being issued
    /// @param baskets The corresponding number of baskets
    event Issuance(
        address indexed issuer,
        address indexed recipient,
        uint256 indexed amount,
        uint192 baskets
    );

    /// Emitted when a redemption of RToken occurs
    /// @param redeemer The address holding RToken
    /// @param recipient The address of the account receiving the backing collateral tokens
    /// @param amount The quantity of RToken being redeemed
    /// @param baskets The corresponding number of baskets
    /// @param amount {qRTok} The amount of RTokens canceled
    event Redemption(
        address indexed redeemer,
        address indexed recipient,
        uint256 indexed amount,
        uint192 baskets
    );

    /// Emitted when the number of baskets needed changes
    /// @param oldBasketsNeeded Previous number of baskets units needed
    /// @param newBasketsNeeded New number of basket units needed
    event BasketsNeededChanged(uint192 oldBasketsNeeded, uint192 newBasketsNeeded);

    /// Emitted when RToken is melted, i.e the RToken supply is decreased but basketsNeeded is not
    /// @param amount {qRTok}
    event Melted(uint256 amount);

    /// Emitted when issuance SupplyThrottle params are set
    event IssuanceThrottleSet(ThrottleLib.Params oldVal, ThrottleLib.Params newVal);

    /// Emitted when redemption SupplyThrottle params are set
    event RedemptionThrottleSet(ThrottleLib.Params oldVal, ThrottleLib.Params newVal);

    // Initialization
    function init(
        IMain main_,
        string memory name_,
        string memory symbol_,
        string memory mandate_,
        ThrottleLib.Params calldata issuanceThrottleParams,
        ThrottleLib.Params calldata redemptionThrottleParams
    ) external;

    /// Issue an RToken with basket collateral
    /// @param amount {qRTok} The quantity of RToken to issue
    /// @custom:interaction
    function issue(uint256 amount) external;

    /// Issue an RToken with basket collateral, to a particular recipient
    /// @param recipient The address to receive the issued RTokens
    /// @param amount {qRTok} The quantity of RToken to issue
    /// @custom:interaction
    function issueTo(address recipient, uint256 amount) external;

    /// Redeem RToken for basket collateral
    /// @param amount {qRTok} The quantity {qRToken} of RToken to redeem
    /// @param basketNonce The nonce of the basket the redemption should be from; else reverts
    /// @custom:interaction
    function redeem(uint256 amount, uint48 basketNonce) external;

    /// Redeem RToken for basket collateral to a particular recipient
    /// @param recipient The address to receive the backing collateral tokens
    /// @param amount {qRTok} The quantity {qRToken} of RToken to redeem
    /// @param basketNonce The nonce of the basket the redemption should be from; else reverts
    /// @custom:interaction
    function redeemTo(
        address recipient,
        uint256 amount,
        uint48 basketNonce
    ) external;

    /// Mints a quantity of RToken to the `recipient`, callable only by the BackingManager
    /// @param recipient The recipient of the newly minted RToken
    /// @param amount {qRTok} The amount to be minted
    /// @custom:protected
    function mint(address recipient, uint256 amount) external;

    /// Melt a quantity of RToken from the caller's account
    /// @param amount {qRTok} The amount to be melted
    function melt(uint256 amount) external;

    /// Set the number of baskets needed directly, callable only by the BackingManager
    /// @param basketsNeeded {BU} The number of baskets to target
    ///                      needed range: pretty interesting
    /// @custom:protected
    function setBasketsNeeded(uint192 basketsNeeded) external;

    /// @return {BU} How many baskets are being targeted
    function basketsNeeded() external view returns (uint192);

    /// @return {qRTok} The maximum issuance that can be performed in the current block
    function issuanceAvailable() external view returns (uint256);

    /// @return {qRTok} The maximum redemption that can be performed in the current block
    function redemptionAvailable() external view returns (uint256);
}

interface TestIRToken is IRToken {
    function setIssuanceThrottleParams(ThrottleLib.Params calldata) external;

    function setRedemptionThrottleParams(ThrottleLib.Params calldata) external;

    function issuanceThrottleParams() external view returns (ThrottleLib.Params memory);

    function redemptionThrottleParams() external view returns (ThrottleLib.Params memory);

    function increaseAllowance(address, uint256) external returns (bool);

    function decreaseAllowance(address, uint256) external returns (bool);

    function monetizeDonations(IERC20) external;
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";
// solhint-disable-next-line max-line-length
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-IERC20PermitUpgradeable.sol";
import "../libraries/Fixed.sol";
import "./IComponent.sol";
import "./IMain.sol";

/**
 * @title IStRSR
 * @notice An ERC20 token representing shares of the RSR over-collateralization pool.
 *
 * StRSR permits the BackingManager to take RSR in times of need. In return, the BackingManager
 * benefits the StRSR pool with RSR rewards purchased with a portion of its revenue.
 *
 * In the absence of collateral default or losses due to slippage, StRSR should have a
 * monotonically increasing exchange rate with respect to RSR, meaning that over time
 * StRSR is redeemable for more RSR. It is non-rebasing.
 */
interface IStRSR is IERC20MetadataUpgradeable, IERC20PermitUpgradeable, IComponent {
    /// Emitted when RSR is staked
    /// @param era The era at time of staking
    /// @param staker The address of the staker
    /// @param rsrAmount {qRSR} How much RSR was staked
    /// @param stRSRAmount {qStRSR} How much stRSR was minted by this staking
    event Staked(
        uint256 indexed era,
        address indexed staker,
        uint256 rsrAmount,
        uint256 indexed stRSRAmount
    );

    /// Emitted when an unstaking is started
    /// @param draftId The id of the draft.
    /// @param draftEra The era of the draft.
    /// @param staker The address of the unstaker
    ///   The triple (staker, draftEra, draftId) is a unique ID
    /// @param rsrAmount {qRSR} How much RSR this unstaking will be worth, absent seizures
    /// @param stRSRAmount {qStRSR} How much stRSR was burned by this unstaking
    event UnstakingStarted(
        uint256 indexed draftId,
        uint256 indexed draftEra,
        address indexed staker,
        uint256 rsrAmount,
        uint256 stRSRAmount,
        uint256 availableAt
    );

    /// Emitted when RSR is unstaked
    /// @param firstId The beginning of the range of draft IDs withdrawn in this transaction
    /// @param endId The end of range of draft IDs withdrawn in this transaction
    ///   (ID i was withdrawn if firstId <= i < endId)
    /// @param draftEra The era of the draft.
    ///   The triple (staker, draftEra, id) is a unique ID among drafts
    /// @param staker The address of the unstaker

    /// @param rsrAmount {qRSR} How much RSR this unstaking was worth
    event UnstakingCompleted(
        uint256 indexed firstId,
        uint256 indexed endId,
        uint256 draftEra,
        address indexed staker,
        uint256 rsrAmount
    );

    /// Emitted whenever the exchange rate changes
    event ExchangeRateSet(uint192 indexed oldVal, uint192 indexed newVal);

    /// Emitted whenever RSR are paids out
    event RewardsPaid(uint256 indexed rsrAmt);

    /// Emitted if all the RSR in the staking pool is seized and all balances are reset to zero.
    event AllBalancesReset(uint256 indexed newEra);
    /// Emitted if all the RSR in the unstakin pool is seized, and all ongoing unstaking is voided.
    event AllUnstakingReset(uint256 indexed newEra);

    event UnstakingDelaySet(uint48 indexed oldVal, uint48 indexed newVal);
    event RewardRatioSet(uint192 indexed oldVal, uint192 indexed newVal);

    // Initialization
    function init(
        IMain main_,
        string memory name_,
        string memory symbol_,
        uint48 unstakingDelay_,
        uint192 rewardRatio_
    ) external;

    /// Gather and payout rewards from rsrTrader
    /// @custom:interaction
    function payoutRewards() external;

    /// Stakes an RSR `amount` on the corresponding RToken to earn yield and over-collateralized
    /// the system
    /// @param amount {qRSR}
    /// @custom:interaction
    function stake(uint256 amount) external;

    /// Begins a delayed unstaking for `amount` stRSR
    /// @param amount {qStRSR}
    /// @custom:interaction
    function unstake(uint256 amount) external;

    /// Complete delayed unstaking for the account, up to (but not including!) `endId`
    /// @custom:interaction
    function withdraw(address account, uint256 endId) external;

    /// Seize RSR, only callable by main.backingManager()
    /// @custom:protected
    function seizeRSR(uint256 amount) external;

    /// Return the maximum valid value of endId such that withdraw(endId) should immediately work
    function endIdForWithdraw(address account) external view returns (uint256 endId);

    /// @return {qRSR/qStRSR} The exchange rate between RSR and StRSR
    function exchangeRate() external view returns (uint192);
}

interface TestIStRSR is IStRSR {
    function rewardRatio() external view returns (uint192);

    function setRewardRatio(uint192) external;

    function unstakingDelay() external view returns (uint48);

    function setUnstakingDelay(uint48) external;

    function increaseAllowance(address, uint256) external returns (bool);

    function decreaseAllowance(address, uint256) external returns (bool);

    /// @return {qStRSR/qRSR} The exchange rate between StRSR and RSR
    function exchangeRate() external view returns (uint192);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

/**
 * Simple generalized trading interface for all Trade contracts to obey
 *
 * Usage: if (canSettle()) settle()
 */
interface ITrade {
    function sell() external view returns (IERC20Metadata);

    function buy() external view returns (IERC20Metadata);

    /// @return The timestamp at which the trade is projected to become settle-able
    function endTime() external view returns (uint48);

    /// @return True if the trade can be settled
    /// @dev Should be guaranteed to be true eventually as an invariant
    function canSettle() external view returns (bool);

    /// Complete the trade and transfer tokens back to the origin trader
    /// @return soldAmt {qSellTok} The quantity of tokens sold
    /// @return boughtAmt {qBuyTok} The quantity of tokens bought
    function settle() external returns (uint256 soldAmt, uint256 boughtAmt);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../libraries/Fixed.sol";
import "./IAsset.sol";
import "./IComponent.sol";
import "./ITrade.sol";
import "./IRewardable.sol";

/**
 * @title ITrading
 * @notice Common events and refresher function for all Trading contracts
 */
interface ITrading is IComponent, IRewardableComponent {
    event MaxTradeSlippageSet(uint192 indexed oldVal, uint192 indexed newVal);
    event MinTradeVolumeSet(uint192 indexed oldVal, uint192 indexed newVal);

    /// Emitted when a trade is started
    /// @param trade The one-time-use trade contract that was just deployed
    /// @param sell The token to sell
    /// @param buy The token to buy
    /// @param sellAmount {qSellTok} The quantity of the selling token
    /// @param minBuyAmount {qBuyTok} The minimum quantity of the buying token to accept
    event TradeStarted(
        ITrade indexed trade,
        IERC20 indexed sell,
        IERC20 indexed buy,
        uint256 sellAmount,
        uint256 minBuyAmount
    );

    /// Emitted after a trade ends
    /// @param trade The one-time-use trade contract
    /// @param sell The token to sell
    /// @param buy The token to buy
    /// @param sellAmount {qSellTok} The quantity of the token sold
    /// @param buyAmount {qBuyTok} The quantity of the token bought
    event TradeSettled(
        ITrade indexed trade,
        IERC20 indexed sell,
        IERC20 indexed buy,
        uint256 sellAmount,
        uint256 buyAmount
    );

    /// Settle a single trade, expected to be used with multicall for efficient mass settlement
    /// @custom:refresher
    function settleTrade(IERC20 sell) external;

    /// @return {%} The maximum trade slippage acceptable
    function maxTradeSlippage() external view returns (uint192);

    /// @return {UoA} The minimum trade volume in UoA, applies to all assets
    function minTradeVolume() external view returns (uint192);

    /// @return The ongoing trade for a sell token, or the zero address
    function trades(IERC20 sell) external view returns (ITrade);

    /// @return The number of ongoing trades open
    function tradesOpen() external view returns (uint48);

    /// Light wrapper around FixLib.mulDiv to support try-catch
    function mulDivCeil(
        uint192 x,
        uint192 y,
        uint192 z
    ) external pure returns (uint192);
}

interface TestITrading is ITrading {
    /// @custom:governance
    function setMaxTradeSlippage(uint192 val) external;

    /// @custom:governance
    function setMinTradeVolume(uint192 val) external;
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

interface IVersioned {
    function version() external view returns (string memory);
}

// SPDX-License-Identifier: BlueOak-1.0.0
// solhint-disable func-name-mixedcase func-visibility
pragma solidity ^0.8.17;

/// @title FixedPoint, a fixed-point arithmetic library defining the custom type uint192
/// @author Matt Elder <[email protected]> and the Reserve Team <https://reserve.org>

/** The logical type `uint192 ` is a 192 bit value, representing an 18-decimal Fixed-point
    fractional value.  This is what's described in the Solidity documentation as
    "fixed192x18" -- a value represented by 192 bits, that makes 18 digits available to
    the right of the decimal point.

    The range of values that uint192 can represent is about [-1.7e20, 1.7e20].
    Unless a function explicitly says otherwise, it will fail on overflow.
    To be clear, the following should hold:
    toFix(0) == 0
    toFix(1) == 1e18
*/

// Analysis notes:
//   Every function should revert iff its result is out of bounds.
//   Unless otherwise noted, when a rounding mode is given, that mode is applied to
//     a single division that may happen as the last step in the computation.
//   Unless otherwise noted, when a rounding mode is *not* given but is needed, it's FLOOR.
//   For each, we comment:
//   - @return is the value expressed  in "value space", where uint192(1e18) "is" 1.0
//   - as-ints: is the value expressed in "implementation space", where uint192(1e18) "is" 1e18
//   The "@return" expression is suitable for actually using the library
//   The "as-ints" expression is suitable for testing

// A uint value passed to this library was out of bounds for uint192 operations
error UIntOutOfBounds();
bytes32 constant UIntOutofBoundsHash = keccak256(abi.encodeWithSignature("UIntOutOfBounds()"));

// Used by P1 implementation for easier casting
uint256 constant FIX_ONE_256 = 1e18;
uint8 constant FIX_DECIMALS = 18;

// If a particular uint192 is represented by the uint192 n, then the uint192 represents the
// value n/FIX_SCALE.
uint64 constant FIX_SCALE = 1e18;

// FIX_SCALE Squared:
uint128 constant FIX_SCALE_SQ = 1e36;

// The largest integer that can be converted to uint192 .
// This is a bit bigger than 3.1e39
uint192 constant FIX_MAX_INT = type(uint192).max / FIX_SCALE;

uint192 constant FIX_ZERO = 0; // The uint192 representation of zero.
uint192 constant FIX_ONE = FIX_SCALE; // The uint192 representation of one.
uint192 constant FIX_MAX = type(uint192).max; // The largest uint192. (Not an integer!)
uint192 constant FIX_MIN = 0; // The smallest uint192.

/// An enum that describes a rounding approach for converting to ints
enum RoundingMode {
    FLOOR, // Round towards zero
    ROUND, // Round to the nearest int
    CEIL // Round away from zero
}

RoundingMode constant FLOOR = RoundingMode.FLOOR;
RoundingMode constant ROUND = RoundingMode.ROUND;
RoundingMode constant CEIL = RoundingMode.CEIL;

/* @dev Solidity 0.8.x only allows you to change one of type or size per type conversion.
   Thus, all the tedious-looking double conversions like uint256(uint256 (foo))
   See: https://docs.soliditylang.org/en/v0.8.17/080-breaking-changes.html#new-restrictions
 */

/// Explicitly convert a uint256 to a uint192. Revert if the input is out of bounds.
function _safeWrap(uint256 x) pure returns (uint192) {
    if (FIX_MAX < x) revert UIntOutOfBounds();
    return uint192(x);
}

/// Convert a uint to its Fix representation.
/// @return x
// as-ints: x * 1e18
function toFix(uint256 x) pure returns (uint192) {
    return _safeWrap(x * FIX_SCALE);
}

/// Convert a uint to its fixed-point representation, and left-shift its value `shiftLeft`
/// decimal digits.
/// @return x * 10**shiftLeft
// as-ints: x * 10**(shiftLeft + 18)
function shiftl_toFix(uint256 x, int8 shiftLeft) pure returns (uint192) {
    return shiftl_toFix(x, shiftLeft, FLOOR);
}

/// @return x * 10**shiftLeft
// as-ints: x * 10**(shiftLeft + 18)
function shiftl_toFix(
    uint256 x,
    int8 shiftLeft,
    RoundingMode rounding
) pure returns (uint192) {
    // conditions for avoiding overflow
    if (x == 0) return 0;
    if (shiftLeft <= -96) return (rounding == CEIL ? 1 : 0); // 0 < uint.max / 10**77 < 0.5
    if (40 <= shiftLeft) revert UIntOutOfBounds(); // 10**56 < FIX_MAX < 10**57

    shiftLeft += 18;

    uint256 coeff = 10**abs(shiftLeft);
    uint256 shifted = (shiftLeft >= 0) ? x * coeff : _divrnd(x, coeff, rounding);

    return _safeWrap(shifted);
}

/// Divide a uint by a uint192, yielding a uint192
/// This may also fail if the result is MIN_uint192! not fixing this for optimization's sake.
/// @return x / y
// as-ints: x * 1e36 / y
function divFix(uint256 x, uint192 y) pure returns (uint192) {
    // If we didn't have to worry about overflow, we'd just do `return x * 1e36 / _y`
    // If it's safe to do this operation the easy way, do it:
    if (x < uint256(type(uint256).max / FIX_SCALE_SQ)) {
        return _safeWrap(uint256(x * FIX_SCALE_SQ) / y);
    } else {
        return _safeWrap(mulDiv256(x, FIX_SCALE_SQ, y));
    }
}

/// Divide a uint by a uint, yielding a  uint192
/// @return x / y
// as-ints: x * 1e18 / y
function divuu(uint256 x, uint256 y) pure returns (uint192) {
    return _safeWrap(mulDiv256(FIX_SCALE, x, y));
}

/// @return min(x,y)
// as-ints: min(x,y)
function fixMin(uint192 x, uint192 y) pure returns (uint192) {
    return x < y ? x : y;
}

/// @return max(x,y)
// as-ints: max(x,y)
function fixMax(uint192 x, uint192 y) pure returns (uint192) {
    return x > y ? x : y;
}

/// @return absoluteValue(x,y)
// as-ints: absoluteValue(x,y)
function abs(int256 x) pure returns (uint256) {
    return x < 0 ? uint256(-x) : uint256(x);
}

/// Divide two uints, returning a uint, using rounding mode `rounding`.
/// @return numerator / divisor
// as-ints: numerator / divisor
function _divrnd(
    uint256 numerator,
    uint256 divisor,
    RoundingMode rounding
) pure returns (uint256) {
    uint256 result = numerator / divisor;

    if (rounding == FLOOR) return result;

    if (rounding == ROUND) {
        if (numerator % divisor > (divisor - 1) / 2) {
            result++;
        }
    } else {
        if (numerator % divisor > 0) {
            result++;
        }
    }

    return result;
}

library FixLib {
    /// Again, all arithmetic functions fail if and only if the result is out of bounds.

    /// Convert this fixed-point value to a uint. Round towards zero if needed.
    /// @return x
    // as-ints: x / 1e18
    function toUint(uint192 x) internal pure returns (uint136) {
        return toUint(x, FLOOR);
    }

    /// Convert this uint192 to a uint
    /// @return x
    // as-ints: x / 1e18 with rounding
    function toUint(uint192 x, RoundingMode rounding) internal pure returns (uint136) {
        return uint136(_divrnd(uint256(x), FIX_SCALE, rounding));
    }

    /// Return the uint192 shifted to the left by `decimal` digits
    /// (Similar to a bitshift but in base 10)
    /// @return x * 10**decimals
    // as-ints: x * 10**decimals
    function shiftl(uint192 x, int8 decimals) internal pure returns (uint192) {
        return shiftl(x, decimals, FLOOR);
    }

    /// Return the uint192 shifted to the left by `decimal` digits
    /// (Similar to a bitshift but in base 10)
    /// @return x * 10**decimals
    // as-ints: x * 10**decimals
    function shiftl(
        uint192 x,
        int8 decimals,
        RoundingMode rounding
    ) internal pure returns (uint192) {
        // Handle overflow cases
        if (x == 0) return 0;
        if (decimals <= -59) return (rounding == CEIL ? 1 : 0); // 59, because 1e58 > 2**192
        if (58 <= decimals) revert UIntOutOfBounds(); // 58, because x * 1e58 > 2 ** 192 if x != 0

        uint256 coeff = uint256(10**abs(decimals));
        return _safeWrap(decimals >= 0 ? x * coeff : _divrnd(x, coeff, rounding));
    }

    /// Add a uint192 to this uint192
    /// @return x + y
    // as-ints: x + y
    function plus(uint192 x, uint192 y) internal pure returns (uint192) {
        return x + y;
    }

    /// Add a uint to this uint192
    /// @return x + y
    // as-ints: x + y*1e18
    function plusu(uint192 x, uint256 y) internal pure returns (uint192) {
        return _safeWrap(x + y * FIX_SCALE);
    }

    /// Subtract a uint192 from this uint192
    /// @return x - y
    // as-ints: x - y
    function minus(uint192 x, uint192 y) internal pure returns (uint192) {
        return x - y;
    }

    /// Subtract a uint from this uint192
    /// @return x - y
    // as-ints: x - y*1e18
    function minusu(uint192 x, uint256 y) internal pure returns (uint192) {
        return _safeWrap(uint256(x) - uint256(y * FIX_SCALE));
    }

    /// Multiply this uint192 by a uint192
    /// Round truncated values to the nearest available value. 5e-19 rounds away from zero.
    /// @return x * y
    // as-ints: x * y/1e18  [division using ROUND, not FLOOR]
    function mul(uint192 x, uint192 y) internal pure returns (uint192) {
        return mul(x, y, ROUND);
    }

    /// Multiply this uint192 by a uint192
    /// @return x * y
    // as-ints: x * y/1e18
    function mul(
        uint192 x,
        uint192 y,
        RoundingMode rounding
    ) internal pure returns (uint192) {
        return _safeWrap(_divrnd(uint256(x) * uint256(y), FIX_SCALE, rounding));
    }

    /// Multiply this uint192 by a uint
    /// @return x * y
    // as-ints: x * y
    function mulu(uint192 x, uint256 y) internal pure returns (uint192) {
        return _safeWrap(x * y);
    }

    /// Divide this uint192 by a uint192
    /// @return x / y
    // as-ints: x * 1e18 / y
    function div(uint192 x, uint192 y) internal pure returns (uint192) {
        return div(x, y, FLOOR);
    }

    /// Divide this uint192 by a uint192
    /// @return x / y
    // as-ints: x * 1e18 / y
    function div(
        uint192 x,
        uint192 y,
        RoundingMode rounding
    ) internal pure returns (uint192) {
        // Multiply-in FIX_SCALE before dividing by y to preserve precision.
        return _safeWrap(_divrnd(uint256(x) * FIX_SCALE, y, rounding));
    }

    /// Divide this uint192 by a uint
    /// @return x / y
    // as-ints: x / y
    function divu(uint192 x, uint256 y) internal pure returns (uint192) {
        return divu(x, y, FLOOR);
    }

    /// Divide this uint192 by a uint
    /// @return x / y
    // as-ints: x / y
    function divu(
        uint192 x,
        uint256 y,
        RoundingMode rounding
    ) internal pure returns (uint192) {
        return _safeWrap(_divrnd(x, y, rounding));
    }

    uint64 constant FIX_HALF = uint64(FIX_SCALE) / 2;

    /// Raise this uint192 to a nonnegative integer power. Requires that x_ <= FIX_ONE
    /// Gas cost is O(lg(y)), precision is +- 1e-18.
    /// @return x_ ** y
    // as-ints: x_ ** y / 1e18**(y-1)    <- technically correct for y = 0. :D
    function powu(uint192 x_, uint48 y) internal pure returns (uint192) {
        require(x_ <= FIX_ONE);
        if (y == 1) return x_;
        if (x_ == FIX_ONE || y == 0) return FIX_ONE;
        uint256 x = uint256(x_) * FIX_SCALE; // x is D36
        uint256 result = FIX_SCALE_SQ; // result is D36
        while (true) {
            if (y & 1 == 1) result = (result * x + FIX_SCALE_SQ / 2) / FIX_SCALE_SQ;
            if (y <= 1) break;
            y = (y >> 1);
            x = (x * x + FIX_SCALE_SQ / 2) / FIX_SCALE_SQ;
        }
        return _safeWrap(result / FIX_SCALE);
    }

    /// Comparison operators...
    function lt(uint192 x, uint192 y) internal pure returns (bool) {
        return x < y;
    }

    function lte(uint192 x, uint192 y) internal pure returns (bool) {
        return x <= y;
    }

    function gt(uint192 x, uint192 y) internal pure returns (bool) {
        return x > y;
    }

    function gte(uint192 x, uint192 y) internal pure returns (bool) {
        return x >= y;
    }

    function eq(uint192 x, uint192 y) internal pure returns (bool) {
        return x == y;
    }

    function neq(uint192 x, uint192 y) internal pure returns (bool) {
        return x != y;
    }

    /// Return whether or not this uint192 is less than epsilon away from y.
    /// @return |x - y| < epsilon
    // as-ints: |x - y| < epsilon
    function near(
        uint192 x,
        uint192 y,
        uint192 epsilon
    ) internal pure returns (bool) {
        uint192 diff = x <= y ? y - x : x - y;
        return diff < epsilon;
    }

    // ================ Chained Operations ================
    // The operation foo_bar() always means:
    //   Do foo() followed by bar(), and overflow only if the _end_ result doesn't fit in an uint192

    /// Shift this uint192 left by `decimals` digits, and convert to a uint
    /// @return x * 10**decimals
    // as-ints: x * 10**(decimals - 18)
    function shiftl_toUint(uint192 x, int8 decimals) internal pure returns (uint256) {
        return shiftl_toUint(x, decimals, FLOOR);
    }

    /// Shift this uint192 left by `decimals` digits, and convert to a uint.
    /// @return x * 10**decimals
    // as-ints: x * 10**(decimals - 18)
    function shiftl_toUint(
        uint192 x,
        int8 decimals,
        RoundingMode rounding
    ) internal pure returns (uint256) {
        // Handle overflow cases
        if (x == 0) return 0; // always computable, no matter what decimals is
        if (decimals <= -42) return (rounding == CEIL ? 1 : 0);
        if (96 <= decimals) revert UIntOutOfBounds();

        decimals -= 18; // shift so that toUint happens at the same time.

        uint256 coeff = uint256(10**abs(decimals));
        return decimals >= 0 ? uint256(x * coeff) : uint256(_divrnd(x, coeff, rounding));
    }

    /// Multiply this uint192 by a uint, and output the result as a uint
    /// @return x * y
    // as-ints: x * y / 1e18
    function mulu_toUint(uint192 x, uint256 y) internal pure returns (uint256) {
        return mulDiv256(uint256(x), y, FIX_SCALE);
    }

    /// Multiply this uint192 by a uint, and output the result as a uint
    /// @return x * y
    // as-ints: x * y / 1e18
    function mulu_toUint(
        uint192 x,
        uint256 y,
        RoundingMode rounding
    ) internal pure returns (uint256) {
        return mulDiv256(uint256(x), y, FIX_SCALE, rounding);
    }

    /// Multiply this uint192 by a uint192 and output the result as a uint
    /// @return x * y
    // as-ints: x * y / 1e36
    function mul_toUint(uint192 x, uint192 y) internal pure returns (uint256) {
        return mulDiv256(uint256(x), uint256(y), FIX_SCALE_SQ);
    }

    /// Multiply this uint192 by a uint192 and output the result as a uint
    /// @return x * y
    // as-ints: x * y / 1e36
    function mul_toUint(
        uint192 x,
        uint192 y,
        RoundingMode rounding
    ) internal pure returns (uint256) {
        return mulDiv256(uint256(x), uint256(y), FIX_SCALE_SQ, rounding);
    }

    /// Compute x * y / z avoiding intermediate overflow
    /// @dev Only use if you need to avoid overflow; costlier than x * y / z
    /// @return x * y / z
    // as-ints: x * y / z
    function muluDivu(
        uint192 x,
        uint256 y,
        uint256 z
    ) internal pure returns (uint192) {
        return muluDivu(x, y, z, FLOOR);
    }

    /// Compute x * y / z, avoiding intermediate overflow
    /// @dev Only use if you need to avoid overflow; costlier than x * y / z
    /// @return x * y / z
    // as-ints: x * y / z
    function muluDivu(
        uint192 x,
        uint256 y,
        uint256 z,
        RoundingMode rounding
    ) internal pure returns (uint192) {
        return _safeWrap(mulDiv256(x, y, z, rounding));
    }

    /// Compute x * y / z on Fixes, avoiding intermediate overflow
    /// @dev Only use if you need to avoid overflow; costlier than x * y / z
    /// @return x * y / z
    // as-ints: x * y / z
    function mulDiv(
        uint192 x,
        uint192 y,
        uint192 z
    ) internal pure returns (uint192) {
        return mulDiv(x, y, z, FLOOR);
    }

    /// Compute x * y / z on Fixes, avoiding intermediate overflow
    /// @dev Only use if you need to avoid overflow; costlier than x * y / z
    /// @return x * y / z
    // as-ints: x * y / z
    function mulDiv(
        uint192 x,
        uint192 y,
        uint192 z,
        RoundingMode rounding
    ) internal pure returns (uint192) {
        return _safeWrap(mulDiv256(x, y, z, rounding));
    }
}

// ================ a couple pure-uint helpers================
// as-ints comments are omitted here, because they're the same as @return statements, because
// these are all pure uint functions

/// Return (x*y/z), avoiding intermediate overflow.
//  Adapted from sources:
//    https://medium.com/coinmonks/4db014e080b1, https://medium.com/wicketh/afa55870a65
//    and quite a few of the other excellent "Mathemagic" posts from https://medium.com/wicketh
/// @dev Only use if you need to avoid overflow; costlier than x * y / z
/// @return result x * y / z
function mulDiv256(
    uint256 x,
    uint256 y,
    uint256 z
) pure returns (uint256 result) {
    unchecked {
        (uint256 hi, uint256 lo) = fullMul(x, y);
        if (hi >= z) revert UIntOutOfBounds();
        uint256 mm = mulmod(x, y, z);
        if (mm > lo) hi -= 1;
        lo -= mm;
        uint256 pow2 = z & (0 - z);
        z /= pow2;
        lo /= pow2;
        lo += hi * ((0 - pow2) / pow2 + 1);
        uint256 r = 1;
        r *= 2 - z * r;
        r *= 2 - z * r;
        r *= 2 - z * r;
        r *= 2 - z * r;
        r *= 2 - z * r;
        r *= 2 - z * r;
        r *= 2 - z * r;
        r *= 2 - z * r;
        result = lo * r;
    }
}

/// Return (x*y/z), avoiding intermediate overflow.
/// @dev Only use if you need to avoid overflow; costlier than x * y / z
/// @return x * y / z
function mulDiv256(
    uint256 x,
    uint256 y,
    uint256 z,
    RoundingMode rounding
) pure returns (uint256) {
    uint256 result = mulDiv256(x, y, z);
    if (rounding == FLOOR) return result;

    uint256 mm = mulmod(x, y, z);
    if (rounding == CEIL) {
        if (mm > 0) result += 1;
    } else {
        if (mm > ((z - 1) / 2)) result += 1; // z should be z-1
    }
    return result;
}

/// Return (x*y) as a "virtual uint512" (lo, hi), representing (hi*2**256 + lo)
///   Adapted from sources:
///   https://medium.com/wicketh/27650fec525d, https://medium.com/coinmonks/4db014e080b1
/// @dev Intended to be internal to this library
/// @return hi (hi, lo) satisfies  hi*(2**256) + lo == x * y
/// @return lo (paired with `hi`)
function fullMul(uint256 x, uint256 y) pure returns (uint256 hi, uint256 lo) {
    unchecked {
        uint256 mm = mulmod(x, y, uint256(0) - uint256(1));
        lo = x * y;
        hi = mm - lo;
        if (mm < lo) hi -= 1;
    }
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "./Fixed.sol";

uint48 constant ONE_HOUR = 3600; // {seconds/hour}

/**
 * @title ThrottleLib
 * A library that implements a usage throttle that can be used to ensure net issuance
 * or net redemption for an RToken never exceeds some bounds per unit time (hour).
 *
 * It is expected for the RToken to use this library with two instances, one for issuance
 * and one for redemption. Issuance causes the available redemption amount to increase, and
 * visa versa.
 */
library ThrottleLib {
    using FixLib for uint192;

    struct Params {
        uint256 amtRate; // {qRTok/hour} a quantity of RToken hourly; cannot be 0
        uint192 pctRate; // {1/hour} a fraction of RToken hourly; can be 0
    }

    struct Throttle {
        // === Gov params ===
        Params params;
        // === Cache ===
        uint48 lastTimestamp; // {seconds}
        uint256 lastAvailable; // {qRTok}
    }

    /// Reverts if usage amount exceeds available amount
    /// @param supply {qRTok} Total RToken supply beforehand
    /// @param amount {qRTok} Amount of RToken to use. Should be negative for the issuance
    ///   throttle during redemption and for the redemption throttle during issuance.
    function useAvailable(
        Throttle storage throttle,
        uint256 supply,
        int256 amount
    ) internal {
        // untestable: amtRate will always be greater > 0 due to previous validations
        if (throttle.params.amtRate == 0 && throttle.params.pctRate == 0) return;

        // Calculate hourly limit
        uint256 limit = hourlyLimit(throttle, supply); // {qRTok}

        // Calculate available amount before supply change
        uint256 available = currentlyAvailable(throttle, limit);

        // Calculate available amount after supply change
        if (amount > 0) {
            require(uint256(amount) <= available, "supply change throttled");
            available -= uint256(amount);
            // untestable: the final else statement, amount will never be 0
        } else if (amount < 0) {
            available += uint256(-amount);
        }

        // Update cached values
        throttle.lastAvailable = available;
        throttle.lastTimestamp = uint48(block.timestamp);
    }

    /// @param limit {qRTok/hour} The hourly limit
    /// @return available {qRTok} Amount currently available for consumption
    function currentlyAvailable(Throttle storage throttle, uint256 limit)
        internal
        view
        returns (uint256 available)
    {
        uint48 delta = uint48(block.timestamp) - throttle.lastTimestamp; // {seconds}
        available = throttle.lastAvailable + (limit * delta) / ONE_HOUR;
        if (available > limit) available = limit;
    }

    /// @return limit {qRTok} The hourly limit
    function hourlyLimit(Throttle storage throttle, uint256 supply)
        internal
        view
        returns (uint256 limit)
    {
        Params storage params = throttle.params;

        // Calculate hourly limit as: max(params.amtRate, supply.mul(params.pctRate))
        limit = (supply * params.pctRate) / FIX_ONE_256; // {qRTok}
        if (params.amtRate > limit) limit = params.amtRate;
    }
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "../../interfaces/IAsset.sol";
import "../../libraries/Fixed.sol";
import "./FiatCollateral.sol";
import "./Asset.sol";
import "./OracleLib.sol";

/**
 * @title AppreciatingFiatCollateral
 * Collateral that may need revenue hiding to become truly "up only"
 *
 * For: {tok} != {ref}, {ref} != {target}, {target} == {UoA}
 * Inheritors _must_ implement _underlyingRefPerTok()
 * Can be easily extended by (optionally) re-implementing:
 *   - tryPrice()
 *   - refPerTok()
 *   - targetPerRef()
 *   - claimRewards()
 * Should not have to re-implement any other methods.
 *
 * Can intentionally disable default checks by setting config.defaultThreshold to 0
 * Can intentionally do no revenue hiding by setting revenueHiding to 0
 */
abstract contract AppreciatingFiatCollateral is FiatCollateral {
    using FixLib for uint192;
    using OracleLib for AggregatorV3Interface;

    // revenueShowing = FIX_ONE.minus(revenueHiding)
    uint192 public immutable revenueShowing; // {1} The maximum fraction of refPerTok to show

    // does not become nonzero until after first refresh()
    uint192 public exposedReferencePrice; // {ref/tok} max ref price observed, sub revenue hiding

    /// @param config.chainlinkFeed Feed units: {UoA/ref}
    /// @param revenueHiding {1} A value like 1e-6 that represents the maximum refPerTok to hide
    constructor(CollateralConfig memory config, uint192 revenueHiding) FiatCollateral(config) {
        require(revenueHiding < FIX_ONE, "revenueHiding out of range");
        revenueShowing = FIX_ONE.minus(revenueHiding);
    }

    /// Can revert, used by other contract functions in order to catch errors
    /// Should not return FIX_MAX for low
    /// Should only return FIX_MAX for high if low is 0
    /// @dev Override this when pricing is more complicated than just a single oracle
    /// @return low {UoA/tok} The low price estimate
    /// @return high {UoA/tok} The high price estimate
    /// @return pegPrice {target/ref} The actual price observed in the peg
    function tryPrice()
        external
        view
        virtual
        override
        returns (
            uint192 low,
            uint192 high,
            uint192 pegPrice
        )
    {
        // {target/ref} = {UoA/ref} / {UoA/target} (1)
        pegPrice = chainlinkFeed.price(oracleTimeout);

        // {UoA/tok} = {target/ref} * {ref/tok} * {UoA/target} (1)
        uint192 p = pegPrice.mul(_underlyingRefPerTok());
        uint192 err = p.mul(oracleError, CEIL);

        low = p - err;
        high = p + err;
        // assert(low <= high); obviously true just by inspection
    }

    /// Should not revert
    /// Refresh exchange rates and update default status.
    /// @dev Should not need to override: can handle collateral with variable refPerTok()
    function refresh() public virtual override {
        if (alreadyDefaulted()) {
            // continue to update rates
            exposedReferencePrice = _underlyingRefPerTok().mul(revenueShowing);
            return;
        }

        CollateralStatus oldStatus = status();

        // Check for hard default
        // must happen before tryPrice() call since `refPerTok()` returns a stored value

        // revenue hiding: do not DISABLE if drawdown is small
        uint192 underlyingRefPerTok = _underlyingRefPerTok();

        // {ref/tok} = {ref/tok} * {1}
        uint192 hiddenReferencePrice = underlyingRefPerTok.mul(revenueShowing);

        // uint192(<) is equivalent to Fix.lt
        if (underlyingRefPerTok < exposedReferencePrice) {
            exposedReferencePrice = hiddenReferencePrice;
            markStatus(CollateralStatus.DISABLED);
        } else if (hiddenReferencePrice > exposedReferencePrice) {
            exposedReferencePrice = hiddenReferencePrice;
        }

        // Check for soft default + save prices
        try this.tryPrice() returns (uint192 low, uint192 high, uint192 pegPrice) {
            // {UoA/tok}, {UoA/tok}, {target/ref}
            // (0, 0) is a valid price; (0, FIX_MAX) is unpriced

            // Save prices if priced
            if (high < FIX_MAX) {
                savedLowPrice = low;
                savedHighPrice = high;
                lastSave = uint48(block.timestamp);
            } else {
                // must be unpriced
                assert(low == 0);
            }

            // If the price is below the default-threshold price, default eventually
            // uint192(+/-) is the same as Fix.plus/minus
            if (pegPrice < pegBottom || pegPrice > pegTop || low == 0) {
                markStatus(CollateralStatus.IFFY);
            } else {
                markStatus(CollateralStatus.SOUND);
            }
        } catch (bytes memory errData) {
            // see: docs/solidity-style.md#Catching-Empty-Data
            if (errData.length == 0) revert(); // solhint-disable-line reason-string
            markStatus(CollateralStatus.IFFY);
        }

        CollateralStatus newStatus = status();
        if (oldStatus != newStatus) {
            emit CollateralStatusChanged(oldStatus, newStatus);
        }
    }

    /// @return {ref/tok} Exposed quantity of whole reference units per whole collateral tokens
    function refPerTok() public view virtual override returns (uint192) {
        return exposedReferencePrice;
    }

    /// Should update in inheritors
    /// @return {ref/tok} Actual quantity of whole reference units per whole collateral tokens
    function _underlyingRefPerTok() internal view virtual returns (uint192);
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "../../interfaces/IAsset.sol";
import "./OracleLib.sol";

contract Asset is IAsset {
    using FixLib for uint192;
    using OracleLib for AggregatorV3Interface;

    AggregatorV3Interface public immutable chainlinkFeed; // {UoA/tok}

    IERC20Metadata public immutable erc20;

    uint8 public immutable erc20Decimals;

    uint192 public immutable override maxTradeVolume; // {UoA}

    uint48 public immutable oracleTimeout; // {s}

    uint192 public immutable oracleError; // {1}

    // === Lot price ===

    uint48 public immutable priceTimeout; // {s} The period over which `savedHighPrice` decays to 0

    uint192 public savedLowPrice; // {UoA/tok} The low price of the token during the last update

    uint192 public savedHighPrice; // {UoA/tok} The high price of the token during the last update

    uint48 public lastSave; // {s} The timestamp when prices were last saved

    /// @param priceTimeout_ {s} The number of seconds over which savedHighPrice decays to 0
    /// @param chainlinkFeed_ Feed units: {UoA/tok}
    /// @param oracleError_ {1} The % the oracle feed can be off by
    /// @param maxTradeVolume_ {UoA} The max trade volume, in UoA
    /// @param oracleTimeout_ {s} The number of seconds until a oracle value becomes invalid
    constructor(
        uint48 priceTimeout_,
        AggregatorV3Interface chainlinkFeed_,
        uint192 oracleError_,
        IERC20Metadata erc20_,
        uint192 maxTradeVolume_,
        uint48 oracleTimeout_
    ) {
        require(priceTimeout_ > 0, "price timeout zero");
        require(address(chainlinkFeed_) != address(0), "missing chainlink feed");
        require(oracleError_ > 0 && oracleError_ < FIX_ONE, "oracle error out of range");
        require(address(erc20_) != address(0), "missing erc20");
        require(maxTradeVolume_ > 0, "invalid max trade volume");
        require(oracleTimeout_ > 0, "oracleTimeout zero");
        priceTimeout = priceTimeout_;
        chainlinkFeed = chainlinkFeed_;
        oracleError = oracleError_;
        erc20 = erc20_;
        erc20Decimals = erc20.decimals();
        maxTradeVolume = maxTradeVolume_;
        oracleTimeout = oracleTimeout_;
    }

    /// Can revert, used by other contract functions in order to catch errors
    /// Should not return FIX_MAX for low
    /// Should only return FIX_MAX for high if low is 0
    /// @dev The third (unused) variable is only here for compatibility with Collateral
    /// @return low {UoA/tok} The low price estimate
    /// @return high {UoA/tok} The high price estimate
    function tryPrice()
        external
        view
        virtual
        returns (
            uint192 low,
            uint192 high,
            uint192
        )
    {
        uint192 p = chainlinkFeed.price(oracleTimeout); // {UoA/tok}
        uint192 err = p.mul(oracleError, CEIL);
        // assert(low <= high); obviously true just by inspection
        return (p - err, p + err, 0);
    }

    /// Should not revert
    /// Refresh saved prices
    function refresh() public virtual override {
        try this.tryPrice() returns (uint192 low, uint192 high, uint192) {
            // {UoA/tok}, {UoA/tok}
            // (0, 0) is a valid price; (0, FIX_MAX) is unpriced

            // Save prices if priced
            if (high < FIX_MAX) {
                savedLowPrice = low;
                savedHighPrice = high;
                lastSave = uint48(block.timestamp);
            } else {
                // must be unpriced
                assert(low == 0);
            }
        } catch (bytes memory errData) {
            // see: docs/solidity-style.md#Catching-Empty-Data
            if (errData.length == 0) revert(); // solhint-disable-line reason-string
        }
    }

    /// Should not revert
    /// @dev Should be general enough to not need to be overridden
    /// @return {UoA/tok} The lower end of the price estimate
    /// @return {UoA/tok} The upper end of the price estimate
    function price() public view virtual returns (uint192, uint192) {
        try this.tryPrice() returns (uint192 low, uint192 high, uint192) {
            assert(low <= high);
            return (low, high);
        } catch (bytes memory errData) {
            // see: docs/solidity-style.md#Catching-Empty-Data
            if (errData.length == 0) revert(); // solhint-disable-line reason-string
            return (0, FIX_MAX);
        }
    }

    /// Should not revert
    /// lotLow should be nonzero when the asset might be worth selling
    /// @dev Should be general enough to not need to be overridden
    /// @return lotLow {UoA/tok} The lower end of the lot price estimate
    /// @return lotHigh {UoA/tok} The upper end of the lot price estimate
    function lotPrice() external view virtual returns (uint192 lotLow, uint192 lotHigh) {
        try this.tryPrice() returns (uint192 low, uint192 high, uint192) {
            // if the price feed is still functioning, use that
            lotLow = low;
            lotHigh = high;
        } catch (bytes memory errData) {
            // see: docs/solidity-style.md#Catching-Empty-Data
            if (errData.length == 0) revert(); // solhint-disable-line reason-string

            // if the price feed is broken, use a decayed historical value

            uint48 delta = uint48(block.timestamp) - lastSave; // {s}
            if (delta >= priceTimeout) return (0, 0); // no price after timeout elapses

            // {1} = {s} / {s}
            uint192 lotMultiplier = divuu(priceTimeout - delta, priceTimeout);

            // {UoA/tok} = {UoA/tok} * {1}
            lotLow = savedLowPrice.mul(lotMultiplier);
            lotHigh = savedHighPrice.mul(lotMultiplier);
        }
        assert(lotLow <= lotHigh);
    }

    /// @return {tok} The balance of the ERC20 in whole tokens
    function bal(address account) external view virtual returns (uint192) {
        return shiftl_toFix(erc20.balanceOf(account), -int8(erc20Decimals));
    }

    /// @return If the asset is an instance of ICollateral or not
    function isCollateral() external pure virtual returns (bool) {
        return false;
    }

    // solhint-disable no-empty-blocks

    /// Claim rewards earned by holding a balance of the ERC20 token
    /// @dev Use delegatecall
    function claimRewards() external virtual {}

    // solhint-enable no-empty-blocks
}

// SPDX-License-Identifier: ISC
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "contracts/interfaces/IAsset.sol";
import "contracts/libraries/Fixed.sol";
import "contracts/plugins/assets/AppreciatingFiatCollateral.sol";
import "./vendor/IConvexStakingWrapper.sol";
import "./PoolTokens.sol";

/**
 * @title CvxStableCollateral
 *  This plugin contract is fully general to any number of tokens in a plain stable pool,
 *  with between 1 and 2 oracles per each token. Stable means only like-kind pools.
 *
 * tok = ConvexStakingWrapper(cvxStablePlainPool)
 * ref = cvxStablePlainPool pool invariant
 * tar = USD
 * UoA = USD
 */
contract CvxStableCollateral is AppreciatingFiatCollateral, PoolTokens {
    using OracleLib for AggregatorV3Interface;
    using FixLib for uint192;

    /// @dev config Unused members: chainlinkFeed, oracleError, oracleTimeout
    /// @dev config.erc20 should be a IConvexStakingWrapper
    constructor(
        CollateralConfig memory config,
        uint192 revenueHiding,
        PTConfiguration memory ptConfig
    ) AppreciatingFiatCollateral(config, revenueHiding) PoolTokens(ptConfig) {
        require(config.defaultThreshold > 0, "defaultThreshold zero");
    }

    /// Can revert, used by other contract functions in order to catch errors
    /// Should not return FIX_MAX for low
    /// Should only return FIX_MAX for high if low is 0
    /// @dev Override this when pricing is more complicated than just a single oracle
    /// @return low {UoA/tok} The low price estimate
    /// @return high {UoA/tok} The high price estimate
    /// @return {target/ref} Unused. Always 0
    function tryPrice()
        external
        view
        virtual
        override
        returns (
            uint192 low,
            uint192 high,
            uint192
        )
    {
        // {UoA}
        (uint192 aumLow, uint192 aumHigh) = totalBalancesValue();

        // {tok}
        uint192 supply = shiftl_toFix(lpToken.totalSupply(), -int8(lpToken.decimals()));
        // We can always assume that the total supply is non-zero

        // {UoA/tok} = {UoA} / {tok}
        low = aumLow.div(supply, FLOOR);
        high = aumHigh.div(supply, CEIL);
        assert(low <= high); // not obviously true just by inspection

        return (low, high, 0);
    }

    /// Should not revert
    /// Refresh exchange rates and update default status.
    /// Have to override to add custom default checks
    function refresh() public virtual override {
        if (alreadyDefaulted()) {
            // continue to update rates
            exposedReferencePrice = _underlyingRefPerTok().mul(revenueShowing);
            return;
        }

        CollateralStatus oldStatus = status();

        // Check for hard default
        // must happen before tryPrice() call since `refPerTok()` returns a stored value

        // revenue hiding: do not DISABLE if drawdown is small
        uint192 underlyingRefPerTok = _underlyingRefPerTok();

        // {ref/tok} = {ref/tok} * {1}
        uint192 hiddenReferencePrice = underlyingRefPerTok.mul(revenueShowing);

        // uint192(<) is equivalent to Fix.lt
        if (underlyingRefPerTok < exposedReferencePrice) {
            exposedReferencePrice = hiddenReferencePrice;
            markStatus(CollateralStatus.DISABLED);
        } else if (hiddenReferencePrice > exposedReferencePrice) {
            exposedReferencePrice = hiddenReferencePrice;
        }

        // Check for soft default + save prices
        try this.tryPrice() returns (uint192 low, uint192 high, uint192) {
            // {UoA/tok}, {UoA/tok}, {UoA/tok}
            // (0, 0) is a valid price; (0, FIX_MAX) is unpriced

            // Save prices if priced
            if (high < FIX_MAX) {
                savedLowPrice = low;
                savedHighPrice = high;
                lastSave = uint48(block.timestamp);
            } else {
                // must be unpriced
                assert(low == 0);
            }

            // If the price is below the default-threshold price, default eventually
            // uint192(+/-) is the same as Fix.plus/minus
            if (low == 0 || _anyDepeggedInPool() || _anyDepeggedOutsidePool()) {
                markStatus(CollateralStatus.IFFY);
            } else {
                markStatus(CollateralStatus.SOUND);
            }
        } catch (bytes memory errData) {
            // see: docs/solidity-style.md#Catching-Empty-Data
            if (errData.length == 0) revert(); // solhint-disable-line reason-string
            markStatus(CollateralStatus.IFFY);
        }

        CollateralStatus newStatus = status();
        if (oldStatus != newStatus) {
            emit CollateralStatusChanged(oldStatus, newStatus);
        }
    }

    /// Claim rewards earned by holding a balance of the ERC20 token
    /// @dev Use delegatecall
    function claimRewards() external override(Asset, IRewardable) {
        IConvexStakingWrapper wrapper = IConvexStakingWrapper(address(erc20));
        IERC20 cvx = IERC20(wrapper.cvx());
        IERC20 crv = IERC20(wrapper.crv());
        uint256 cvxOldBal = cvx.balanceOf(address(this));
        uint256 crvOldBal = crv.balanceOf(address(this));
        wrapper.getReward(address(this));
        emit RewardsClaimed(cvx, cvx.balanceOf(address(this)) - cvxOldBal);
        emit RewardsClaimed(crv, crv.balanceOf(address(this)) - crvOldBal);
    }

    // === Internal ===

    /// @return {ref/tok} Actual quantity of whole reference units per whole collateral tokens
    function _underlyingRefPerTok() internal view virtual override returns (uint192) {
        return _safeWrap(curvePool.get_virtual_price());
    }

    // Override this later to implement non-stable pools
    function _anyDepeggedInPool() internal view virtual returns (bool) {
        // Check reference token oracles
        for (uint8 i = 0; i < nTokens; i++) {
            try this.tokenPrice(i) returns (uint192 low, uint192 high) {
                // {UoA/tok} = {UoA/tok} + {UoA/tok}
                uint192 mid = (low + high) / 2;

                // If the price is below the default-threshold price, default eventually
                // uint192(+/-) is the same as Fix.plus/minus
                if (mid < pegBottom || mid > pegTop) return true;
            } catch (bytes memory errData) {
                // see: docs/solidity-style.md#Catching-Empty-Data
                if (errData.length == 0) revert(); // solhint-disable-line reason-string
                return true;
            }
        }

        return false;
    }

    // Override this in child classes to implement metapools
    function _anyDepeggedOutsidePool() internal view virtual returns (bool) {
        return false;
    }
}

// SPDX-License-Identifier: ISC
pragma solidity 0.8.17;

import "./CvxStableCollateral.sol";

// solhint-disable no-empty-blocks
interface ICurveMetaPool is ICurvePool, IERC20Metadata {

}

/**
 * @title CvxStableMetapoolCollateral
 *  This plugin contract is intended for 2-token stable metapools that
 *  DO NOT involve RTokens, such as LUSD-fraxBP or MIM-3CRV.
 *
 * tok = ConvexStakingWrapper(PairedUSDToken/USDBasePool)
 * ref = PairedUSDToken/USDBasePool pool invariant
 * tar = USD
 * UoA = USD
 */
contract CvxStableMetapoolCollateral is CvxStableCollateral {
    using OracleLib for AggregatorV3Interface;
    using FixLib for uint192;

    ICurveMetaPool public immutable metapoolToken; // top-level LP token + CurvePool

    IERC20Metadata public immutable pairedToken; // the token paired with ptConfig.lpToken

    uint192 public immutable pairedTokenPegBottom; // {target/ref} pegBottom but for paired token

    uint192 public immutable pairedTokenPegTop; // {target/ref} pegTop but for paired token

    /// @param config.chainlinkFeed Feed units: {UoA/pairedTok}
    /// @dev config.chainlinkFeed/oracleError/oracleTimeout should be set for paired token
    /// @dev config.erc20 should be a IConvexStakingWrapper
    constructor(
        CollateralConfig memory config,
        uint192 revenueHiding,
        PTConfiguration memory ptConfig,
        ICurveMetaPool metapoolToken_,
        uint192 pairedTokenDefaultThreshold_
    ) CvxStableCollateral(config, revenueHiding, ptConfig) {
        require(address(metapoolToken_) != address(0), "metapoolToken address is zero");
        require(
            pairedTokenDefaultThreshold_ > 0 && pairedTokenDefaultThreshold_ < FIX_ONE,
            "pairedTokenDefaultThreshold out of bounds"
        );
        metapoolToken = metapoolToken_;
        pairedToken = IERC20Metadata(metapoolToken.coins(0)); // like LUSD or MIM

        // {target/ref} = {target/ref} * {1}
        uint192 peg = targetPerRef(); // {target/ref}
        uint192 delta = peg.mul(pairedTokenDefaultThreshold_);
        pairedTokenPegBottom = peg - delta;
        pairedTokenPegTop = peg + delta;

        // Sanity checks we have the correct pool
        assert(address(pairedToken) != address(0));
        assert(metapoolToken.coins(1) == address(lpToken));
    }

    /// Can revert, used by other contract functions in order to catch errors
    /// Should not return FIX_MAX for low
    /// Should only return FIX_MAX for high if low is 0
    /// @dev Override this when pricing is more complicated than just a single oracle
    /// @return low {UoA/tok} The low price estimate
    /// @return high {UoA/tok} The high price estimate
    /// @return pegPrice {target/ref} The actual price observed in the peg
    function tryPrice()
        external
        view
        virtual
        override
        returns (
            uint192 low,
            uint192 high,
            uint192 pegPrice
        )
    {
        // {UoA/pairedTok}
        uint192 lowPaired;
        uint192 highPaired = FIX_MAX;
        try this.tryPairedPrice() returns (uint192 lowPaired_, uint192 highPaired_) {
            lowPaired = lowPaired_;
            highPaired = highPaired_;
        } catch {}

        // {UoA}
        (uint192 aumLow, uint192 aumHigh) = _metapoolBalancesValue(lowPaired, highPaired);

        // {tok}
        uint192 supply = shiftl_toFix(metapoolToken.totalSupply(), -int8(metapoolToken.decimals()));
        // We can always assume that the total supply is non-zero

        // {UoA/tok} = {UoA} / {tok}
        low = aumLow.div(supply, FLOOR);
        high = aumHigh.div(supply, CEIL);
        assert(low <= high); // not obviously true just by inspection

        return (low, high, 0);
    }

    /// Can revert, used by `_anyDepeggedOutsidePool()`
    /// Should not return FIX_MAX for low
    /// Should only return FIX_MAX for high if low is 0
    /// @return lowPaired {UoA/pairedTok} The low price estimate of the paired token
    /// @return highPaired {UoA/pairedTok} The high price estimate of the paired token
    function tryPairedPrice() public view virtual returns (uint192 lowPaired, uint192 highPaired) {
        uint192 p = chainlinkFeed.price(oracleTimeout); // {UoA/pairedTok}
        uint192 delta = p.mul(oracleError, CEIL);
        return (p - delta, p + delta);
    }

    // === Internal ===

    /// @return {ref/tok} Actual quantity of whole reference units per whole collateral tokens
    function _underlyingRefPerTok() internal view override returns (uint192) {
        return _safeWrap(metapoolToken.get_virtual_price());
    }

    // Check for defaults outside the pool
    function _anyDepeggedOutsidePool() internal view virtual override returns (bool) {
        try this.tryPairedPrice() returns (uint192 low, uint192 high) {
            // {UoA/tok} = {UoA/tok} + {UoA/tok}
            uint192 mid = (low + high) / 2;

            // If the price is below the default-threshold price, default eventually
            // uint192(+/-) is the same as Fix.plus/minus
            if (mid < pairedTokenPegBottom || mid > pairedTokenPegTop) return true;
        } catch (bytes memory errData) {
            // see: docs/solidity-style.md#Catching-Empty-Data
            if (errData.length == 0) revert(); // solhint-disable-line reason-string
            return true;
        }
        return false;
    }

    /// @param lowPaired {UoA/pairedTok}
    /// @param highPaired {UoA/pairedTok}
    /// @return aumLow {UoA}
    /// @return aumHigh {UoA}
    function _metapoolBalancesValue(uint192 lowPaired, uint192 highPaired)
        internal
        view
        returns (uint192 aumLow, uint192 aumHigh)
    {
        // {UoA}
        (uint192 underlyingAumLow, uint192 underlyingAumHigh) = totalBalancesValue();

        // {tokUnderlying}
        uint192 underlyingSupply = shiftl_toFix(lpToken.totalSupply(), -int8(lpToken.decimals()));

        // {UoA/tokUnderlying} = {UoA} / {tokUnderlying}
        uint192 underlyingLow = underlyingAumLow.div(underlyingSupply, FLOOR);
        uint192 underlyingHigh = underlyingAumHigh.div(underlyingSupply, CEIL);

        // {tokUnderlying}
        uint192 balUnderlying = shiftl_toFix(metapoolToken.balances(1), -int8(lpToken.decimals()));

        // {UoA} = {UoA/tokUnderlying} * {tokUnderlying}
        aumLow = underlyingLow.mul(balUnderlying, FLOOR);
        aumHigh = underlyingHigh.mul(balUnderlying, CEIL);

        // {pairedTok}
        uint192 pairedBal = shiftl_toFix(metapoolToken.balances(0), -int8(pairedToken.decimals()));

        // Add-in contribution from pairedTok
        // {UoA} = {UoA} + {UoA/pairedTok} * {pairedTok}
        aumLow += lowPaired.mul(pairedBal, FLOOR);

        // Add-in high part carefully
        uint192 toAdd = safeMul(highPaired, pairedBal, CEIL);
        if (aumHigh + uint256(toAdd) >= FIX_MAX) aumHigh = FIX_MAX;
        else aumHigh += toAdd;
    }

    /// Multiply two fixes, rounding up to FIX_MAX and down to 0
    /// @param a First param to multiply
    /// @param b Second param to multiply
    function safeMul(
        uint192 a,
        uint192 b,
        RoundingMode rounding
    ) internal pure returns (uint192) {
        // untestable:
        //      a will never = 0 here because of the check in _price()
        if (a == 0 || b == 0) return 0;
        // untestable:
        //      a = FIX_MAX iff b = 0
        if (a == FIX_MAX || b == FIX_MAX) return FIX_MAX;

        // return FIX_MAX instead of throwing overflow errors.
        unchecked {
            // p and mul *are* Fix values, so have 18 decimals (D18)
            uint256 rawDelta = uint256(b) * a; // {D36} = {D18} * {D18}
            // if we overflowed, then return FIX_MAX
            if (rawDelta / b != a) return FIX_MAX;
            uint256 shiftDelta = rawDelta;

            // add in rounding
            if (rounding == RoundingMode.ROUND) shiftDelta += (FIX_ONE / 2);
            else if (rounding == RoundingMode.CEIL) shiftDelta += FIX_ONE - 1;

            // untestable (here there be dragons):
            // (below explanation is for the ROUND case, but it extends to the FLOOR/CEIL too)
            //          A)  shiftDelta = rawDelta + (FIX_ONE / 2)
            //      shiftDelta overflows if:
            //          B)  shiftDelta = MAX_UINT256 - FIX_ONE/2 + 1
            //              rawDelta + (FIX_ONE/2) = MAX_UINT256 - FIX_ONE/2 + 1
            //              b * a = MAX_UINT256 - FIX_ONE + 1
            //      therefore shiftDelta overflows if:
            //          C)  b = (MAX_UINT256 - FIX_ONE + 1) / a
            //      MAX_UINT256 ~= 1e77 , FIX_MAX ~= 6e57 (6e20 difference in magnitude)
            //      a <= 1e21 (MAX_TARGET_AMT)
            //      a must be between 1e19 & 1e20 in order for b in (C) to be uint192,
            //      but a would have to be < 1e18 in order for (A) to overflow
            if (shiftDelta < rawDelta) return FIX_MAX;

            // return FIX_MAX if return result would truncate
            if (shiftDelta / FIX_ONE > FIX_MAX) return FIX_MAX;

            // return _div(rawDelta, FIX_ONE, rounding)
            return uint192(shiftDelta / FIX_ONE); // {D18} = {D36} / {D18}
        }
    }
}

// SPDX-License-Identifier: ISC
pragma solidity 0.8.17;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "contracts/plugins/assets/OracleLib.sol";
import "contracts/libraries/Fixed.sol";

// solhint-disable func-name-mixedcase
interface ICurvePool {
    // For Curve Plain Pools and V2 Metapools
    function coins(uint256) external view returns (address);

    // Only exists in Curve Lending Pools
    function underlying_coins(uint256) external view returns (address);

    // Only exists in V1 Curve Metapools; not used currently
    function base_coins(uint256) external view returns (address);

    function balances(uint256) external view returns (uint256);

    function get_virtual_price() external view returns (uint256);

    function token() external view returns (address);

    function exchange(
        int128,
        int128,
        uint256,
        uint256
    ) external;
}

// solhint-enable func-name-mixedcase

/// Supports CvxCurve non-meta pools for up to 4 tokens
contract PoolTokens {
    using OracleLib for AggregatorV3Interface;
    using FixLib for uint192;

    error WrongIndex(uint8 maxLength);
    error NoToken(uint8 tokenNumber);

    enum CurvePoolType {
        Plain,
        Lending,
        Metapool // not supported via this class. parent class handles metapool math
    }

    // === State (Immutable) ===

    ICurvePool public immutable curvePool;
    IERC20Metadata public immutable lpToken;
    uint8 internal immutable nTokens;

    IERC20Metadata internal immutable token0;
    IERC20Metadata internal immutable token1;
    IERC20Metadata internal immutable token2;
    IERC20Metadata internal immutable token3;

    // For each token, we maintain up to two feeds/timeouts/errors
    // The data below would normally be a struct, but we want bytecode substitution

    AggregatorV3Interface internal immutable _t0feed0;
    AggregatorV3Interface internal immutable _t0feed1;
    uint48 internal immutable _t0timeout0; // {s}
    uint48 internal immutable _t0timeout1; // {s}
    uint192 internal immutable _t0error0; // {1}
    uint192 internal immutable _t0error1; // {1}

    AggregatorV3Interface internal immutable _t1feed0;
    AggregatorV3Interface internal immutable _t1feed1;
    uint48 internal immutable _t1timeout0; // {s}
    uint48 internal immutable _t1timeout1; // {s}
    uint192 internal immutable _t1error0; // {1}
    uint192 internal immutable _t1error1; // {1}

    AggregatorV3Interface internal immutable _t2feed0;
    AggregatorV3Interface internal immutable _t2feed1;
    uint48 internal immutable _t2timeout0; // {s}
    uint48 internal immutable _t2timeout1; // {s}
    uint192 internal immutable _t2error0; // {1}
    uint192 internal immutable _t2error1; // {1}

    AggregatorV3Interface internal immutable _t3feed0;
    AggregatorV3Interface internal immutable _t3feed1;
    uint48 internal immutable _t3timeout0; // {s}
    uint48 internal immutable _t3timeout1; // {s}
    uint192 internal immutable _t3error0; // {1}
    uint192 internal immutable _t3error1; // {1}

    // === Config ===

    struct PTConfiguration {
        uint8 nTokens;
        ICurvePool curvePool;
        IERC20Metadata lpToken;
        CurvePoolType poolType;
        AggregatorV3Interface[][] feeds; // row should multiply to give {UoA/ref}; max columns is 2
        uint48[][] oracleTimeouts; // {s} same order as feeds
        uint192[][] oracleErrors; // {1} same order as feeds
    }

    constructor(PTConfiguration memory config) {
        require(config.nTokens <= 4, "up to 4 tokens max");
        require(maxFeedsLength(config.feeds) <= 2, "price feeds limited to 2");
        require(
            config.feeds.length == config.nTokens && minFeedsLength(config.feeds) > 0,
            "each token needs at least 1 price feed"
        );
        require(address(config.curvePool) != address(0), "curvePool address is zero");

        curvePool = config.curvePool;
        nTokens = config.nTokens;
        lpToken = config.lpToken;

        // Solidity does not support immutable arrays. This is a hack to get the equivalent of
        // an immutable array so we do not have store the token feeds in the blockchain. This is
        // a gas optimization since it is significantly more expensive to read and write on the
        // blockchain than it is to use embedded values in the bytecode.

        // === Tokens ===

        IERC20Metadata[] memory tokens = new IERC20Metadata[](nTokens);
        for (uint8 i = 0; i < nTokens; ++i) {
            if (config.poolType == CurvePoolType.Plain) {
                tokens[i] = IERC20Metadata(curvePool.coins(i));
            } else if (config.poolType == CurvePoolType.Lending) {
                tokens[i] = IERC20Metadata(curvePool.underlying_coins(i));
            } else {
                revert("Use MetaPoolTokens class");
            }
        }

        token0 = tokens[0];
        token1 = tokens[1];
        token2 = (nTokens > 2) ? tokens[2] : IERC20Metadata(address(0));
        token3 = (nTokens > 3) ? tokens[3] : IERC20Metadata(address(0));

        // === Feeds + timeouts ===
        // I know this lots extremely verbose and quite silly, but it actually makes sense:
        //   - immutable variables cannot be conditionally written to
        //   - a struct or an array would not be able to be immutable
        //   - immutable variables means values get in-lined in the bytecode

        // token0
        bool more = config.feeds[0].length > 0;
        _t0feed0 = more ? config.feeds[0][0] : AggregatorV3Interface(address(0));
        _t0timeout0 = more && config.oracleTimeouts[0].length > 0 ? config.oracleTimeouts[0][0] : 0;
        _t0error0 = more && config.oracleErrors[0].length > 0 ? config.oracleErrors[0][0] : 0;
        if (more) {
            require(address(_t0feed0) != address(0), "t0feed0 empty");
            require(_t0timeout0 > 0, "t0timeout0 zero");
            require(_t0error0 < FIX_ONE, "t0error0 too large");
        }

        more = config.feeds[0].length > 1;
        _t0feed1 = more ? config.feeds[0][1] : AggregatorV3Interface(address(0));
        _t0timeout1 = more && config.oracleTimeouts[0].length > 1 ? config.oracleTimeouts[0][1] : 0;
        _t0error1 = more && config.oracleErrors[0].length > 1 ? config.oracleErrors[0][1] : 0;
        if (more) {
            require(address(_t0feed1) != address(0), "t0feed1 empty");
            require(_t0timeout1 > 0, "t0timeout1 zero");
            require(_t0error1 < FIX_ONE, "t0error1 too large");
        }

        // token1
        more = config.feeds[1].length > 0;
        _t1feed0 = more ? config.feeds[1][0] : AggregatorV3Interface(address(0));
        _t1timeout0 = more && config.oracleTimeouts[1].length > 0 ? config.oracleTimeouts[1][0] : 0;
        _t1error0 = more && config.oracleErrors[1].length > 0 ? config.oracleErrors[1][0] : 0;
        if (more) {
            require(address(_t1feed0) != address(0), "t1feed0 empty");
            require(_t1timeout0 > 0, "t1timeout0 zero");
            require(_t1error0 < FIX_ONE, "t1error0 too large");
        }

        more = config.feeds[1].length > 1;
        _t1feed1 = more ? config.feeds[1][1] : AggregatorV3Interface(address(0));
        _t1timeout1 = more && config.oracleTimeouts[1].length > 1 ? config.oracleTimeouts[1][1] : 0;
        _t1error1 = more && config.oracleErrors[1].length > 1 ? config.oracleErrors[1][1] : 0;
        if (more) {
            require(address(_t1feed1) != address(0), "t1feed1 empty");
            require(_t1timeout1 > 0, "t1timeout1 zero");
            require(_t1error1 < FIX_ONE, "t1error1 too large");
        }

        // token2
        more = config.feeds.length > 2 && config.feeds[2].length > 0;
        _t2feed0 = more ? config.feeds[2][0] : AggregatorV3Interface(address(0));
        _t2timeout0 = more && config.oracleTimeouts[2].length > 0 ? config.oracleTimeouts[2][0] : 0;
        _t2error0 = more && config.oracleErrors[2].length > 0 ? config.oracleErrors[2][0] : 0;
        if (more) {
            require(address(_t2feed0) != address(0), "t2feed0 empty");
            require(_t2timeout0 > 0, "t2timeout0 zero");
            require(_t2error0 < FIX_ONE, "t2error0 too large");
        }

        more = config.feeds.length > 2 && config.feeds[2].length > 1;
        _t2feed1 = more ? config.feeds[2][1] : AggregatorV3Interface(address(0));
        _t2timeout1 = more && config.oracleTimeouts[2].length > 1 ? config.oracleTimeouts[2][1] : 0;
        _t2error1 = more && config.oracleErrors[2].length > 1 ? config.oracleErrors[2][1] : 0;
        if (more) {
            require(address(_t2feed1) != address(0), "t2feed1 empty");
            require(_t2timeout1 > 0, "t2timeout1 zero");
            require(_t2error1 < FIX_ONE, "t2error1 too large");
        }

        // token3
        more = config.feeds.length > 3 && config.feeds[3].length > 0;
        _t3feed0 = more ? config.feeds[3][0] : AggregatorV3Interface(address(0));
        _t3timeout0 = more && config.oracleTimeouts[3].length > 0 ? config.oracleTimeouts[3][0] : 0;
        _t3error0 = more && config.oracleErrors[3].length > 0 ? config.oracleErrors[3][0] : 0;
        if (more) {
            require(address(_t3feed0) != address(0), "t3feed0 empty");
            require(_t3timeout0 > 0, "t3timeout0 zero");
            require(_t3error0 < FIX_ONE, "t3error0 too large");
        }

        more = config.feeds.length > 3 && config.feeds[3].length > 1;
        _t3feed1 = more ? config.feeds[3][1] : AggregatorV3Interface(address(0));
        _t3timeout1 = more && config.oracleTimeouts[3].length > 1 ? config.oracleTimeouts[3][1] : 0;
        _t3error1 = more && config.oracleErrors[3].length > 1 ? config.oracleErrors[3][1] : 0;
        if (more) {
            require(address(_t3feed1) != address(0), "t3feed1 empty");
            require(_t3timeout1 > 0, "t3timeout1 zero");
            require(_t3error1 < FIX_ONE, "t3error1 too large");
        }
    }

    /// @param index The index of the token: 0, 1, 2, or 3
    /// @return low {UoA/ref_index}
    /// @return high {UoA/ref_index}
    function tokenPrice(uint8 index) public view returns (uint192 low, uint192 high) {
        if (index >= nTokens) revert WrongIndex(nTokens - 1);

        // Use only 1 feed if 2nd feed not defined
        // otherwise: multiply feeds together, e.g; {UoA/ref} = {UoA/target} * {target/ref}
        uint192 x;
        uint192 y = FIX_ONE;
        uint192 xErr; // {1}
        uint192 yErr; // {1}
        // if only 1 feed: `y` is FIX_ONE and `yErr` is 0

        if (index == 0) {
            x = _t0feed0.price(_t0timeout0);
            xErr = _t0error0;
            if (address(_t0feed1) != address(0)) {
                y = _t0feed1.price(_t0timeout1);
                yErr = _t0error1;
            }
        } else if (index == 1) {
            x = _t1feed0.price(_t1timeout0);
            xErr = _t1error0;
            if (address(_t1feed1) != address(0)) {
                y = _t1feed1.price(_t1timeout1);
                yErr = _t1error1;
            }
        } else if (index == 2) {
            x = _t2feed0.price(_t2timeout0);
            xErr = _t2error0;
            if (address(_t2feed1) != address(0)) {
                y = _t2feed1.price(_t2timeout1);
                yErr = _t2error1;
            }
        } else {
            x = _t3feed0.price(_t3timeout0);
            xErr = _t3error0;
            if (address(_t3feed1) != address(0)) {
                y = _t3feed1.price(_t3timeout1);
                yErr = _t3error1;
            }
        }

        return toRange(x, y, xErr, yErr);
    }

    // === Internal ===

    /// @return low {UoA}
    /// @return high {UoA}
    function totalBalancesValue() internal view returns (uint192 low, uint192 high) {
        for (uint8 i = 0; i < nTokens; ++i) {
            IERC20Metadata token = getToken(i);
            uint192 balance = shiftl_toFix(curvePool.balances(i), -int8(token.decimals()));
            (uint192 lowP, uint192 highP) = tokenPrice(i);

            low += balance.mul(lowP, FLOOR);
            high += balance.mul(highP, CEIL);
        }
    }

    /// @return [{tok}]
    function getBalances() internal view virtual returns (uint192[] memory) {
        uint192[] memory balances = new uint192[](nTokens);

        for (uint8 i = 0; i < nTokens; ++i) {
            IERC20Metadata token = getToken(i);
            uint192 balance = shiftl_toFix(curvePool.balances(i), -int8(token.decimals()));
            balances[i] = (balance);
        }

        return balances;
    }

    // === Private ===

    function getToken(uint8 index) private view returns (IERC20Metadata) {
        if (index >= nTokens) revert WrongIndex(nTokens - 1);
        if (index == 0) return token0;
        if (index == 1) return token1;
        if (index == 2) return token2;
        return token3;
    }

    function minFeedsLength(AggregatorV3Interface[][] memory feeds) private pure returns (uint8) {
        uint8 minLength = type(uint8).max;
        for (uint8 i = 0; i < feeds.length; ++i) {
            minLength = uint8(Math.min(minLength, feeds[i].length));
        }
        return minLength;
    }

    function maxFeedsLength(AggregatorV3Interface[][] memory feeds) private pure returns (uint8) {
        uint8 maxLength;
        for (uint8 i = 0; i < feeds.length; ++i) {
            maxLength = uint8(Math.max(maxLength, feeds[i].length));
        }
        return maxLength;
    }

    /// x and y can be any two fixes that can be multiplied
    /// @param xErr {1} error associated with x
    /// @param yErr {1} error associated with y
    /// returns low and high extremes of x * y, given errors
    function toRange(
        uint192 x,
        uint192 y,
        uint192 xErr,
        uint192 yErr
    ) private pure returns (uint192 low, uint192 high) {
        low = x.mul(FIX_ONE - xErr).mul(y.mul(FIX_ONE - yErr), FLOOR);
        high = x.mul(FIX_ONE + xErr).mul(y.mul(FIX_ONE + yErr), CEIL);
    }
}

// SPDX-License-Identifier: ISC
pragma solidity 0.8.17;

interface IConvexStakingWrapper {
    function crv() external returns (address);

    function cvx() external returns (address);

    function getReward(address _account) external;
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "../../interfaces/IAsset.sol";
import "../../libraries/Fixed.sol";
import "./Asset.sol";
import "./OracleLib.sol";

uint48 constant MAX_DELAY_UNTIL_DEFAULT = 1209600; // {s} 2 weeks

struct CollateralConfig {
    uint48 priceTimeout; // {s} The number of seconds over which saved prices decay
    AggregatorV3Interface chainlinkFeed; // Feed units: {target/ref}
    uint192 oracleError; // {1} The % the oracle feed can be off by
    IERC20Metadata erc20; // The ERC20 of the collateral token
    uint192 maxTradeVolume; // {UoA} The max trade volume, in UoA
    uint48 oracleTimeout; // {s} The number of seconds until a oracle value becomes invalid
    bytes32 targetName; // The bytes32 representation of the target name
    uint192 defaultThreshold; // {1} A value like 0.05 that represents a deviation tolerance
    // set defaultThreshold to zero to create SelfReferentialCollateral
    uint48 delayUntilDefault; // {s} The number of seconds an oracle can mulfunction
}

/**
 * @title FiatCollateral
 * Parent class for all collateral. Can be extended to support appreciating collateral
 *
 * For: {tok} == {ref}, {ref} != {target}, {target} == {UoA}
 * Can be easily extended by (optionally) re-implementing:
 *   - tryPrice()
 *   - refPerTok()
 *   - targetPerRef()
 *   - claimRewards()
 * If you have appreciating collateral, then you should use AppreciatingFiatCollateral or
 * override refresh() yourself.
 *
 * Can intentionally disable default checks by setting config.defaultThreshold to 0
 */
contract FiatCollateral is ICollateral, Asset {
    using FixLib for uint192;
    using OracleLib for AggregatorV3Interface;

    // Default Status:
    // _whenDefault == NEVER: no risk of default (initial value)
    // _whenDefault > block.timestamp: delayed default may occur as soon as block.timestamp.
    //                In this case, the asset may recover, reachiving _whenDefault == NEVER.
    // _whenDefault <= block.timestamp: default has already happened (permanently)
    uint48 private constant NEVER = type(uint48).max;
    uint48 private _whenDefault = NEVER;

    uint48 public immutable delayUntilDefault; // {s} e.g 86400

    // targetName: The canonical name of this collateral's target unit.
    bytes32 public immutable targetName;

    uint192 public immutable pegBottom; // {target/ref} The bottom of the peg

    uint192 public immutable pegTop; // {target/ref} The top of the peg

    /// @param config.chainlinkFeed Feed units: {UoA/ref}
    constructor(CollateralConfig memory config)
        Asset(
            config.priceTimeout,
            config.chainlinkFeed,
            config.oracleError,
            config.erc20,
            config.maxTradeVolume,
            config.oracleTimeout
        )
    {
        require(config.targetName != bytes32(0), "targetName missing");
        if (config.defaultThreshold > 0) {
            require(config.delayUntilDefault > 0, "delayUntilDefault zero");
        }
        require(config.delayUntilDefault <= 1209600, "delayUntilDefault too long");

        targetName = config.targetName;
        delayUntilDefault = config.delayUntilDefault;

        // Cache constants
        uint192 peg = targetPerRef(); // {target/ref}

        // {target/ref} = {target/ref} * {1}
        uint192 delta = peg.mul(config.defaultThreshold);
        pegBottom = peg - delta;
        pegTop = peg + delta;
    }

    /// Can revert, used by other contract functions in order to catch errors
    /// Should not return FIX_MAX for low
    /// Should only return FIX_MAX for high if low is 0
    /// @dev Override this when pricing is more complicated than just a single oracle
    /// @return low {UoA/tok} The low price estimate
    /// @return high {UoA/tok} The high price estimate
    /// @return pegPrice {target/ref} The actual price observed in the peg
    function tryPrice()
        external
        view
        virtual
        override
        returns (
            uint192 low,
            uint192 high,
            uint192 pegPrice
        )
    {
        // {target/ref} = {UoA/ref} / {UoA/target} (1)
        pegPrice = chainlinkFeed.price(oracleTimeout);

        // {target/ref} = {target/ref} * {1}
        uint192 err = pegPrice.mul(oracleError, CEIL);

        low = pegPrice - err;
        high = pegPrice + err;
        // assert(low <= high); obviously true just by inspection
    }

    /// Should not revert
    /// Refresh exchange rates and update default status.
    /// @dev May need to override: limited to handling collateral with refPerTok() = 1
    function refresh() public virtual override(Asset, IAsset) {
        if (alreadyDefaulted()) return;
        CollateralStatus oldStatus = status();

        // Check for soft default + save lotPrice
        try this.tryPrice() returns (uint192 low, uint192 high, uint192 pegPrice) {
            // {UoA/tok}, {UoA/tok}, {target/ref}
            // (0, 0) is a valid price; (0, FIX_MAX) is unpriced

            // Save prices if priced
            if (high < FIX_MAX) {
                savedLowPrice = low;
                savedHighPrice = high;
                lastSave = uint48(block.timestamp);
            } else {
                // must be unpriced
                assert(low == 0);
            }

            // If the price is below the default-threshold price, default eventually
            // uint192(+/-) is the same as Fix.plus/minus
            if (pegPrice < pegBottom || pegPrice > pegTop || low == 0) {
                markStatus(CollateralStatus.IFFY);
            } else {
                markStatus(CollateralStatus.SOUND);
            }
        } catch (bytes memory errData) {
            // see: docs/solidity-style.md#Catching-Empty-Data
            if (errData.length == 0) revert(); // solhint-disable-line reason-string
            markStatus(CollateralStatus.IFFY);
        }

        CollateralStatus newStatus = status();
        if (oldStatus != newStatus) {
            emit CollateralStatusChanged(oldStatus, newStatus);
        }
    }

    /// @return The collateral's status
    function status() public view returns (CollateralStatus) {
        if (_whenDefault == NEVER) {
            return CollateralStatus.SOUND;
        } else if (_whenDefault > block.timestamp) {
            return CollateralStatus.IFFY;
        } else {
            return CollateralStatus.DISABLED;
        }
    }

    // === Helpers for child classes ===

    function markStatus(CollateralStatus status_) internal {
        // untestable:
        //      All calls to markStatus happen exclusively if the collateral is not defaulted
        if (_whenDefault <= block.timestamp) return; // prevent DISABLED -> SOUND/IFFY

        if (status_ == CollateralStatus.SOUND) {
            _whenDefault = NEVER;
        } else if (status_ == CollateralStatus.IFFY) {
            uint256 sum = block.timestamp + uint256(delayUntilDefault);
            // untestable:
            //      constructor enforces max length on delayUntilDefault
            if (sum >= NEVER) _whenDefault = NEVER;
            else if (sum < _whenDefault) _whenDefault = uint48(sum);
            // else: no change to _whenDefault
            // untested:
            //      explicit `if` to check DISABLED. else branch will never be hit
        } else if (status_ == CollateralStatus.DISABLED) {
            _whenDefault = uint48(block.timestamp);
        }
    }

    function alreadyDefaulted() internal view returns (bool) {
        return _whenDefault <= block.timestamp;
    }

    function whenDefault() external view returns (uint256) {
        return _whenDefault;
    }

    // === End child helpers ===

    /// @return {ref/tok} Quantity of whole reference units per whole collateral tokens
    function refPerTok() public view virtual returns (uint192) {
        return FIX_ONE;
    }

    /// @return {target/ref} Quantity of whole target units per whole reference unit in the peg
    function targetPerRef() public view virtual returns (uint192) {
        return FIX_ONE;
    }

    /// @return If the asset is an instance of ICollateral or not
    function isCollateral() external pure virtual override(Asset, IAsset) returns (bool) {
        return true;
    }
}

// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "../../libraries/Fixed.sol";

error StalePrice();

/// Used by asset plugins to price their collateral
library OracleLib {
    /// @dev Use for on-the-fly calculations that should revert
    /// @param timeout The number of seconds after which oracle values should be considered stale
    /// @return {UoA/tok}
    function price(AggregatorV3Interface chainlinkFeed, uint48 timeout)
        internal
        view
        returns (uint192)
    {
        (uint80 roundId, int256 p, , uint256 updateTime, uint80 answeredInRound) = chainlinkFeed
            .latestRoundData();

        if (updateTime == 0 || answeredInRound < roundId) {
            revert StalePrice();
        }
        // Downcast is safe: uint256(-) reverts on underflow; block.timestamp assumed < 2^48
        uint48 secondsSince = uint48(block.timestamp - updateTime);
        if (secondsSince > timeout) revert StalePrice();

        // {UoA/tok}
        return shiftl_toFix(uint256(p), -int8(chainlinkFeed.decimals()));
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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IERC20Metadata","name":"lpToken","type":"address"},{"internalType":"enum PoolTokens.CurvePoolType","name":"poolType","type":"uint8"},{"internalType":"contract AggregatorV3Interface[][]","name":"feeds","type":"address[][]"},{"internalType":"uint48[][]","name":"oracleTimeouts","type":"uint48[][]"},{"internalType":"uint192[][]","name":"oracleErrors","type":"uint192[][]"}],"internalType":"struct PoolTokens.PTConfiguration","name":"ptConfig","type":"tuple"},{"internalType":"contract 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IERC20","name":"erc20","type":"address"},{"indexed":true,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"RewardsClaimed","type":"event"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"bal","outputs":[{"internalType":"uint192","name":"","type":"uint192"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainlinkFeed","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"curvePool","outputs":[{"internalType":"contract ICurvePool","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"delayUntilDefault","outputs":[{"internalType":"uint48","name":"","type":"uint48"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"erc20","outputs":[{"internalType":"contract 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-----Decoded View---------------
Arg [0] : config (tuple): System.Collections.Generic.List`1[Nethereum.ABI.FunctionEncoding.ParameterOutput]
Arg [1] : revenueHiding (uint192): 1000000000000
Arg [2] : ptConfig (tuple): System.Collections.Generic.List`1[Nethereum.ABI.FunctionEncoding.ParameterOutput]
Arg [3] : metapoolToken_ (address): 0xAEda92e6A3B1028edc139A4ae56Ec881f3064D4F
Arg [4] : pairedTokenDefaultThreshold_ (uint192): 20000000000000000

-----Encoded View---------------
41 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000093a80
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [3] : 00000000000000000000000083cd6bd8591ac6090bd336c96e61062c103f0ad9
Arg [4] : 00000000000000000000000000000000000000000000d3c21bcecceda1000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [6] : 5553440000000000000000000000000000000000000000000000000000000000
Arg [7] : 00000000000000000000000000000000000000000000000000470de4df820000
Arg [8] : 000000000000000000000000000000000000000000000000000000000003f480
Arg [9] : 000000000000000000000000000000000000000000000000000000e8d4a51000
Arg [10] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [11] : 000000000000000000000000aeda92e6a3b1028edc139a4ae56ec881f3064d4f
Arg [12] : 00000000000000000000000000000000000000000000000000470de4df820000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [14] : 000000000000000000000000dcef968d416a41cdac0ed8702fac8128a64241a2
Arg [15] : 0000000000000000000000003175df0976dfa876431c2e9ee6bc45b65d3473cc
Arg [16] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [17] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [18] : 00000000000000000000000000000000000000000000000000000000000001c0
Arg [19] : 00000000000000000000000000000000000000000000000000000000000002a0
Arg [20] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [21] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [22] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [23] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [24] : 000000000000000000000000b9e1e3a9feff48998e45fa90847ed4d467e8bcfd
Arg [25] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [26] : 0000000000000000000000008fffffd4afb6115b954bd326cbe7b4ba576818f6
Arg [27] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [28] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [29] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [30] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [31] : 0000000000000000000000000000000000000000000000000000000000000e4c
Arg [32] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [33] : 00000000000000000000000000000000000000000000000000000000000151bc
Arg [34] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [35] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [36] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [37] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [38] : 000000000000000000000000000000000000000000000000002386f26fc10000
Arg [39] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [40] : 0000000000000000000000000000000000000000000000000008e1bc9bf04000