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// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

import { OETHVaultCore } from "./OETHVaultCore.sol";

/**
 * @title Origin Sonic VaultCore contract on Sonic
 * @author Origin Protocol Inc
 */
contract OSonicVaultCore is OETHVaultCore {
    /// @param _wS Sonic's Wrapped S token
    constructor(address _wS) OETHVaultCore(_wS) {}

    /**
     * @notice Instant redeem is not supported on Sonic.
     * Use the asynchronous `requestWithdrawal` a `claimWithdrawal` instead.
     */
    function _redeem(uint256, uint256) internal override {
        revert("unsupported function");
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/math/SafeCast.sol)

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint224 from uint256, reverting on
     * overflow (when the input is greater than largest uint224).
     *
     * Counterpart to Solidity's `uint224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     */
    function toUint224(uint256 value) internal pure returns (uint224) {
        require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
        return uint224(value);
    }

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint96 from uint256, reverting on
     * overflow (when the input is greater than largest uint96).
     *
     * Counterpart to Solidity's `uint96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     */
    function toUint96(uint256 value) internal pure returns (uint96) {
        require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
        return uint96(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128) {
        require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits");
        return int128(value);
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64) {
        require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits");
        return int64(value);
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32) {
        require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits");
        return int32(value);
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16) {
        require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits");
        return int16(value);
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits.
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8) {
        require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits");
        return int8(value);
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
        require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

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

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

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

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

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

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

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

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

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title Base for contracts that are managed by the Origin Protocol's Governor.
 * @dev Copy of the openzeppelin Ownable.sol contract with nomenclature change
 *      from owner to governor and renounce methods removed. Does not use
 *      Context.sol like Ownable.sol does for simplification.
 * @author Origin Protocol Inc
 */
abstract contract Governable {
    // Storage position of the owner and pendingOwner of the contract
    // keccak256("OUSD.governor");
    bytes32 private constant governorPosition =
        0x7bea13895fa79d2831e0a9e28edede30099005a50d652d8957cf8a607ee6ca4a;

    // keccak256("OUSD.pending.governor");
    bytes32 private constant pendingGovernorPosition =
        0x44c4d30b2eaad5130ad70c3ba6972730566f3e6359ab83e800d905c61b1c51db;

    // keccak256("OUSD.reentry.status");
    bytes32 private constant reentryStatusPosition =
        0x53bf423e48ed90e97d02ab0ebab13b2a235a6bfbe9c321847d5c175333ac4535;

    // See OpenZeppelin ReentrancyGuard implementation
    uint256 constant _NOT_ENTERED = 1;
    uint256 constant _ENTERED = 2;

    event PendingGovernorshipTransfer(
        address indexed previousGovernor,
        address indexed newGovernor
    );

    event GovernorshipTransferred(
        address indexed previousGovernor,
        address indexed newGovernor
    );

    /**
     * @notice Returns the address of the current Governor.
     */
    function governor() public view returns (address) {
        return _governor();
    }

    /**
     * @dev Returns the address of the current Governor.
     */
    function _governor() internal view returns (address governorOut) {
        bytes32 position = governorPosition;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            governorOut := sload(position)
        }
    }

    /**
     * @dev Returns the address of the pending Governor.
     */
    function _pendingGovernor()
        internal
        view
        returns (address pendingGovernor)
    {
        bytes32 position = pendingGovernorPosition;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            pendingGovernor := sload(position)
        }
    }

    /**
     * @dev Throws if called by any account other than the Governor.
     */
    modifier onlyGovernor() {
        require(isGovernor(), "Caller is not the Governor");
        _;
    }

    /**
     * @notice Returns true if the caller is the current Governor.
     */
    function isGovernor() public view returns (bool) {
        return msg.sender == _governor();
    }

    function _setGovernor(address newGovernor) internal {
        emit GovernorshipTransferred(_governor(), newGovernor);

        bytes32 position = governorPosition;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(position, newGovernor)
        }
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        bytes32 position = reentryStatusPosition;
        uint256 _reentry_status;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            _reentry_status := sload(position)
        }

        // On the first call to nonReentrant, _notEntered will be true
        require(_reentry_status != _ENTERED, "Reentrant call");

        // Any calls to nonReentrant after this point will fail
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(position, _ENTERED)
        }

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(position, _NOT_ENTERED)
        }
    }

    function _setPendingGovernor(address newGovernor) internal {
        bytes32 position = pendingGovernorPosition;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(position, newGovernor)
        }
    }

    /**
     * @notice Transfers Governance of the contract to a new account (`newGovernor`).
     * Can only be called by the current Governor. Must be claimed for this to complete
     * @param _newGovernor Address of the new Governor
     */
    function transferGovernance(address _newGovernor) external onlyGovernor {
        _setPendingGovernor(_newGovernor);
        emit PendingGovernorshipTransfer(_governor(), _newGovernor);
    }

    /**
     * @notice Claim Governance of the contract to a new account (`newGovernor`).
     * Can only be called by the new Governor.
     */
    function claimGovernance() external {
        require(
            msg.sender == _pendingGovernor(),
            "Only the pending Governor can complete the claim"
        );
        _changeGovernor(msg.sender);
    }

    /**
     * @dev Change Governance of the contract to a new account (`newGovernor`).
     * @param _newGovernor Address of the new Governor
     */
    function _changeGovernor(address _newGovernor) internal {
        require(_newGovernor != address(0), "New Governor is address(0)");
        _setGovernor(_newGovernor);
    }
}

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

interface IBasicToken {
    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

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

interface IGetExchangeRateToken {
    function getExchangeRate() external view returns (uint256 _exchangeRate);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

interface IOracle {
    /**
     * @dev returns the asset price in USD, in 8 decimal digits.
     *
     * The version of priceProvider deployed for OETH has 18 decimal digits
     */
    function price(address asset) external view returns (uint256);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title Platform interface to integrate with lending platform like Compound, AAVE etc.
 */
interface IStrategy {
    /**
     * @dev Deposit the given asset to platform
     * @param _asset asset address
     * @param _amount Amount to deposit
     */
    function deposit(address _asset, uint256 _amount) external;

    /**
     * @dev Deposit the entire balance of all supported assets in the Strategy
     *      to the platform
     */
    function depositAll() external;

    /**
     * @dev Withdraw given asset from Lending platform
     */
    function withdraw(
        address _recipient,
        address _asset,
        uint256 _amount
    ) external;

    /**
     * @dev Liquidate all assets in strategy and return them to Vault.
     */
    function withdrawAll() external;

    /**
     * @dev Returns the current balance of the given asset.
     */
    function checkBalance(address _asset)
        external
        view
        returns (uint256 balance);

    /**
     * @dev Returns bool indicating whether strategy supports asset.
     */
    function supportsAsset(address _asset) external view returns (bool);

    /**
     * @dev Collect reward tokens from the Strategy.
     */
    function collectRewardTokens() external;

    /**
     * @dev The address array of the reward tokens for the Strategy.
     */
    function getRewardTokenAddresses() external view returns (address[] memory);

    function harvesterAddress() external view returns (address);

    function transferToken(address token, uint256 amount) external;

    function setRewardTokenAddresses(address[] calldata _rewardTokenAddresses)
        external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

import { VaultStorage } from "../vault/VaultStorage.sol";

interface IVault {
    // slither-disable-start constable-states

    event AssetSupported(address _asset);
    event AssetDefaultStrategyUpdated(address _asset, address _strategy);
    event AssetAllocated(address _asset, address _strategy, uint256 _amount);
    event StrategyApproved(address _addr);
    event StrategyRemoved(address _addr);
    event Mint(address _addr, uint256 _value);
    event Redeem(address _addr, uint256 _value);
    event CapitalPaused();
    event CapitalUnpaused();
    event RebasePaused();
    event RebaseUnpaused();
    event VaultBufferUpdated(uint256 _vaultBuffer);
    event RedeemFeeUpdated(uint256 _redeemFeeBps);
    event PriceProviderUpdated(address _priceProvider);
    event AllocateThresholdUpdated(uint256 _threshold);
    event RebaseThresholdUpdated(uint256 _threshold);
    event StrategistUpdated(address _address);
    event MaxSupplyDiffChanged(uint256 maxSupplyDiff);
    event YieldDistribution(address _to, uint256 _yield, uint256 _fee);
    event TrusteeFeeBpsChanged(uint256 _basis);
    event TrusteeAddressChanged(address _address);
    event SwapperChanged(address _address);
    event SwapAllowedUndervalueChanged(uint256 _basis);
    event SwapSlippageChanged(address _asset, uint256 _basis);
    event Swapped(
        address indexed _fromAsset,
        address indexed _toAsset,
        uint256 _fromAssetAmount,
        uint256 _toAssetAmount
    );
    event StrategyAddedToMintWhitelist(address indexed strategy);
    event StrategyRemovedFromMintWhitelist(address indexed strategy);
    event DripperChanged(address indexed _dripper);
    event WithdrawalRequested(
        address indexed _withdrawer,
        uint256 indexed _requestId,
        uint256 _amount,
        uint256 _queued
    );
    event WithdrawalClaimed(
        address indexed _withdrawer,
        uint256 indexed _requestId,
        uint256 _amount
    );
    event WithdrawalClaimable(uint256 _claimable, uint256 _newClaimable);

    // Governable.sol
    function transferGovernance(address _newGovernor) external;

    function claimGovernance() external;

    function governor() external view returns (address);

    function ADMIN_IMPLEMENTATION() external view returns (address);

    // VaultAdmin.sol
    function setPriceProvider(address _priceProvider) external;

    function priceProvider() external view returns (address);

    function setRedeemFeeBps(uint256 _redeemFeeBps) external;

    function redeemFeeBps() external view returns (uint256);

    function setVaultBuffer(uint256 _vaultBuffer) external;

    function vaultBuffer() external view returns (uint256);

    function setAutoAllocateThreshold(uint256 _threshold) external;

    function autoAllocateThreshold() external view returns (uint256);

    function setRebaseThreshold(uint256 _threshold) external;

    function rebaseThreshold() external view returns (uint256);

    function setStrategistAddr(address _address) external;

    function strategistAddr() external view returns (address);

    function setMaxSupplyDiff(uint256 _maxSupplyDiff) external;

    function maxSupplyDiff() external view returns (uint256);

    function setTrusteeAddress(address _address) external;

    function trusteeAddress() external view returns (address);

    function setTrusteeFeeBps(uint256 _basis) external;

    function trusteeFeeBps() external view returns (uint256);

    function ousdMetaStrategy() external view returns (address);

    function setSwapper(address _swapperAddr) external;

    function setSwapAllowedUndervalue(uint16 _percentageBps) external;

    function setOracleSlippage(address _asset, uint16 _allowedOracleSlippageBps)
        external;

    function supportAsset(address _asset, uint8 _unitConversion) external;

    function approveStrategy(address _addr) external;

    function removeStrategy(address _addr) external;

    function setAssetDefaultStrategy(address _asset, address _strategy)
        external;

    function assetDefaultStrategies(address _asset)
        external
        view
        returns (address);

    function pauseRebase() external;

    function unpauseRebase() external;

    function rebasePaused() external view returns (bool);

    function pauseCapital() external;

    function unpauseCapital() external;

    function capitalPaused() external view returns (bool);

    function transferToken(address _asset, uint256 _amount) external;

    function priceUnitMint(address asset) external view returns (uint256);

    function priceUnitRedeem(address asset) external view returns (uint256);

    function withdrawAllFromStrategy(address _strategyAddr) external;

    function withdrawAllFromStrategies() external;

    function withdrawFromStrategy(
        address _strategyFromAddress,
        address[] calldata _assets,
        uint256[] calldata _amounts
    ) external;

    function depositToStrategy(
        address _strategyToAddress,
        address[] calldata _assets,
        uint256[] calldata _amounts
    ) external;

    // VaultCore.sol
    function mint(
        address _asset,
        uint256 _amount,
        uint256 _minimumOusdAmount
    ) external;

    function mintForStrategy(uint256 _amount) external;

    function redeem(uint256 _amount, uint256 _minimumUnitAmount) external;

    function burnForStrategy(uint256 _amount) external;

    function allocate() external;

    function rebase() external;

    function swapCollateral(
        address fromAsset,
        address toAsset,
        uint256 fromAssetAmount,
        uint256 minToAssetAmount,
        bytes calldata data
    ) external returns (uint256 toAssetAmount);

    function totalValue() external view returns (uint256 value);

    function checkBalance(address _asset) external view returns (uint256);

    function calculateRedeemOutputs(uint256 _amount)
        external
        view
        returns (uint256[] memory);

    function getAssetCount() external view returns (uint256);

    function getAssetConfig(address _asset)
        external
        view
        returns (VaultStorage.Asset memory config);

    function getAllAssets() external view returns (address[] memory);

    function getStrategyCount() external view returns (uint256);

    function swapper() external view returns (address);

    function allowedSwapUndervalue() external view returns (uint256);

    function getAllStrategies() external view returns (address[] memory);

    function isSupportedAsset(address _asset) external view returns (bool);

    function netOusdMintForStrategyThreshold() external view returns (uint256);

    function setOusdMetaStrategy(address _ousdMetaStrategy) external;

    function setNetOusdMintForStrategyThreshold(uint256 _threshold) external;

    function netOusdMintedForStrategy() external view returns (int256);

    function setDripper(address _dripper) external;

    function dripper() external view returns (address);

    function weth() external view returns (address);

    function cacheWETHAssetIndex() external;

    function wethAssetIndex() external view returns (uint256);

    function initialize(address, address) external;

    function setAdminImpl(address) external;

    function removeAsset(address _asset) external;

    // These are OETH specific functions
    function addWithdrawalQueueLiquidity() external;

    function requestWithdrawal(uint256 _amount)
        external
        returns (uint256 requestId, uint256 queued);

    function claimWithdrawal(uint256 requestId)
        external
        returns (uint256 amount);

    function claimWithdrawals(uint256[] memory requestIds)
        external
        returns (uint256[] memory amounts, uint256 totalAmount);

    function withdrawalQueueMetadata()
        external
        view
        returns (VaultStorage.WithdrawalQueueMetadata memory);

    function withdrawalRequests(uint256 requestId)
        external
        view
        returns (VaultStorage.WithdrawalRequest memory);

    // OETHb specific functions
    function addStrategyToMintWhitelist(address strategyAddr) external;

    function removeStrategyFromMintWhitelist(address strategyAddr) external;

    function isMintWhitelistedStrategy(address strategyAddr)
        external
        view
        returns (bool);

    function withdrawalClaimDelay() external view returns (uint256);

    function setWithdrawalClaimDelay(uint256 newDelay) external;

    function lastRebase() external view returns (uint64);

    function dripDuration() external view returns (uint64);

    function setDripDuration(uint256 _dripDuration) external;

    function rebasePerSecondMax() external view returns (uint64);

    function setRebaseRateMax(uint256 yearlyApr) external;

    function rebasePerSecondTarget() external view returns (uint64);

    function previewYield() external view returns (uint256 yield);

    // slither-disable-end constable-states
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title OUSD Token Contract
 * @dev ERC20 compatible contract for OUSD
 * @dev Implements an elastic supply
 * @author Origin Protocol Inc
 */
import { IVault } from "../interfaces/IVault.sol";
import { Governable } from "../governance/Governable.sol";
import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol";

contract OUSD is Governable {
    using SafeCast for int256;
    using SafeCast for uint256;

    /// @dev Event triggered when the supply changes
    /// @param totalSupply Updated token total supply
    /// @param rebasingCredits Updated token rebasing credits
    /// @param rebasingCreditsPerToken Updated token rebasing credits per token
    event TotalSupplyUpdatedHighres(
        uint256 totalSupply,
        uint256 rebasingCredits,
        uint256 rebasingCreditsPerToken
    );
    /// @dev Event triggered when an account opts in for rebasing
    /// @param account Address of the account
    event AccountRebasingEnabled(address account);
    /// @dev Event triggered when an account opts out of rebasing
    /// @param account Address of the account
    event AccountRebasingDisabled(address account);
    /// @dev Emitted when `value` tokens are moved from one account `from` to
    ///      another `to`.
    /// @param from Address of the account tokens are moved from
    /// @param to Address of the account tokens are moved to
    /// @param value Amount of tokens transferred
    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.
    /// @param owner Address of the owner approving allowance
    /// @param spender Address of the spender allowance is granted to
    /// @param value Amount of tokens spender can transfer
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    /// @dev Yield resulting from {changeSupply} that a `source` account would
    ///      receive is directed to `target` account.
    /// @param source Address of the source forwarding the yield
    /// @param target Address of the target receiving the yield
    event YieldDelegated(address source, address target);
    /// @dev Yield delegation from `source` account to the `target` account is
    ///      suspended.
    /// @param source Address of the source suspending yield forwarding
    /// @param target Address of the target no longer receiving yield from `source`
    ///        account
    event YieldUndelegated(address source, address target);

    enum RebaseOptions {
        NotSet,
        StdNonRebasing,
        StdRebasing,
        YieldDelegationSource,
        YieldDelegationTarget
    }

    uint256[154] private _gap; // Slots to align with deployed contract
    uint256 private constant MAX_SUPPLY = type(uint128).max;
    /// @dev The amount of tokens in existence
    uint256 public totalSupply;
    mapping(address => mapping(address => uint256)) private allowances;
    /// @dev The vault with privileges to execute {mint}, {burn}
    ///     and {changeSupply}
    address public vaultAddress;
    mapping(address => uint256) internal creditBalances;
    // the 2 storage variables below need trailing underscores to not name collide with public functions
    uint256 private rebasingCredits_; // Sum of all rebasing credits (creditBalances for rebasing accounts)
    uint256 private rebasingCreditsPerToken_;
    /// @dev The amount of tokens that are not rebasing - receiving yield
    uint256 public nonRebasingSupply;
    mapping(address => uint256) internal alternativeCreditsPerToken;
    /// @dev A map of all addresses and their respective RebaseOptions
    mapping(address => RebaseOptions) public rebaseState;
    mapping(address => uint256) private __deprecated_isUpgraded;
    /// @dev A map of addresses that have yields forwarded to. This is an
    ///      inverse mapping of {yieldFrom}
    /// Key Account forwarding yield
    /// Value Account receiving yield
    mapping(address => address) public yieldTo;
    /// @dev A map of addresses that are receiving the yield. This is an
    ///      inverse mapping of {yieldTo}
    /// Key Account receiving yield
    /// Value Account forwarding yield
    mapping(address => address) public yieldFrom;

    uint256 private constant RESOLUTION_INCREASE = 1e9;
    uint256[34] private __gap; // including below gap totals up to 200

    /// @dev Verifies that the caller is the Governor or Strategist.
    modifier onlyGovernorOrStrategist() {
        require(
            isGovernor() || msg.sender == IVault(vaultAddress).strategistAddr(),
            "Caller is not the Strategist or Governor"
        );
        _;
    }

    /// @dev Initializes the contract and sets necessary variables.
    /// @param _vaultAddress Address of the vault contract
    /// @param _initialCreditsPerToken The starting rebasing credits per token.
    function initialize(address _vaultAddress, uint256 _initialCreditsPerToken)
        external
        onlyGovernor
    {
        require(_vaultAddress != address(0), "Zero vault address");
        require(vaultAddress == address(0), "Already initialized");

        rebasingCreditsPerToken_ = _initialCreditsPerToken;
        vaultAddress = _vaultAddress;
    }

    /// @dev Returns the symbol of the token, a shorter version
    ///      of the name.
    function symbol() external pure virtual returns (string memory) {
        return "OUSD";
    }

    /// @dev Returns the name of the token.
    function name() external pure virtual returns (string memory) {
        return "Origin Dollar";
    }

    /// @dev Returns the number of decimals used to get its user representation.
    function decimals() external pure virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev Verifies that the caller is the Vault contract
     */
    modifier onlyVault() {
        require(vaultAddress == msg.sender, "Caller is not the Vault");
        _;
    }

    /**
     * @return High resolution rebasingCreditsPerToken
     */
    function rebasingCreditsPerTokenHighres() external view returns (uint256) {
        return rebasingCreditsPerToken_;
    }

    /**
     * @return Low resolution rebasingCreditsPerToken
     */
    function rebasingCreditsPerToken() external view returns (uint256) {
        return rebasingCreditsPerToken_ / RESOLUTION_INCREASE;
    }

    /**
     * @return High resolution total number of rebasing credits
     */
    function rebasingCreditsHighres() external view returns (uint256) {
        return rebasingCredits_;
    }

    /**
     * @return Low resolution total number of rebasing credits
     */
    function rebasingCredits() external view returns (uint256) {
        return rebasingCredits_ / RESOLUTION_INCREASE;
    }

    /**
     * @notice Gets the balance of the specified address.
     * @param _account Address to query the balance of.
     * @return A uint256 representing the amount of base units owned by the
     *         specified address.
     */
    function balanceOf(address _account) public view returns (uint256) {
        RebaseOptions state = rebaseState[_account];
        if (state == RebaseOptions.YieldDelegationSource) {
            // Saves a slot read when transferring to or from a yield delegating source
            // since we know creditBalances equals the balance.
            return creditBalances[_account];
        }
        uint256 baseBalance = (creditBalances[_account] * 1e18) /
            _creditsPerToken(_account);
        if (state == RebaseOptions.YieldDelegationTarget) {
            // creditBalances of yieldFrom accounts equals token balances
            return baseBalance - creditBalances[yieldFrom[_account]];
        }
        return baseBalance;
    }

    /**
     * @notice Gets the credits balance of the specified address.
     * @dev Backwards compatible with old low res credits per token.
     * @param _account The address to query the balance of.
     * @return (uint256, uint256) Credit balance and credits per token of the
     *         address
     */
    function creditsBalanceOf(address _account)
        external
        view
        returns (uint256, uint256)
    {
        uint256 cpt = _creditsPerToken(_account);
        if (cpt == 1e27) {
            // For a period before the resolution upgrade, we created all new
            // contract accounts at high resolution. Since they are not changing
            // as a result of this upgrade, we will return their true values
            return (creditBalances[_account], cpt);
        } else {
            return (
                creditBalances[_account] / RESOLUTION_INCREASE,
                cpt / RESOLUTION_INCREASE
            );
        }
    }

    /**
     * @notice Gets the credits balance of the specified address.
     * @param _account The address to query the balance of.
     * @return (uint256, uint256, bool) Credit balance, credits per token of the
     *         address, and isUpgraded
     */
    function creditsBalanceOfHighres(address _account)
        external
        view
        returns (
            uint256,
            uint256,
            bool
        )
    {
        return (
            creditBalances[_account],
            _creditsPerToken(_account),
            true // all accounts have their resolution "upgraded"
        );
    }

    // Backwards compatible view
    function nonRebasingCreditsPerToken(address _account)
        external
        view
        returns (uint256)
    {
        return alternativeCreditsPerToken[_account];
    }

    /**
     * @notice Transfer tokens to a specified address.
     * @param _to the address to transfer to.
     * @param _value the amount to be transferred.
     * @return true on success.
     */
    function transfer(address _to, uint256 _value) external returns (bool) {
        require(_to != address(0), "Transfer to zero address");

        _executeTransfer(msg.sender, _to, _value);

        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
     * @notice Transfer tokens from one address to another.
     * @param _from The address you want to send tokens from.
     * @param _to The address you want to transfer to.
     * @param _value The amount of tokens to be transferred.
     * @return true on success.
     */
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) external returns (bool) {
        require(_to != address(0), "Transfer to zero address");
        uint256 userAllowance = allowances[_from][msg.sender];
        require(_value <= userAllowance, "Allowance exceeded");

        unchecked {
            allowances[_from][msg.sender] = userAllowance - _value;
        }

        _executeTransfer(_from, _to, _value);

        emit Transfer(_from, _to, _value);
        return true;
    }

    function _executeTransfer(
        address _from,
        address _to,
        uint256 _value
    ) internal {
        (
            int256 fromRebasingCreditsDiff,
            int256 fromNonRebasingSupplyDiff
        ) = _adjustAccount(_from, -_value.toInt256());
        (
            int256 toRebasingCreditsDiff,
            int256 toNonRebasingSupplyDiff
        ) = _adjustAccount(_to, _value.toInt256());

        _adjustGlobals(
            fromRebasingCreditsDiff + toRebasingCreditsDiff,
            fromNonRebasingSupplyDiff + toNonRebasingSupplyDiff
        );
    }

    function _adjustAccount(address _account, int256 _balanceChange)
        internal
        returns (int256 rebasingCreditsDiff, int256 nonRebasingSupplyDiff)
    {
        RebaseOptions state = rebaseState[_account];
        int256 currentBalance = balanceOf(_account).toInt256();
        if (currentBalance + _balanceChange < 0) {
            revert("Transfer amount exceeds balance");
        }
        uint256 newBalance = (currentBalance + _balanceChange).toUint256();

        if (state == RebaseOptions.YieldDelegationSource) {
            address target = yieldTo[_account];
            uint256 targetOldBalance = balanceOf(target);
            uint256 targetNewCredits = _balanceToRebasingCredits(
                targetOldBalance + newBalance
            );
            rebasingCreditsDiff =
                targetNewCredits.toInt256() -
                creditBalances[target].toInt256();

            creditBalances[_account] = newBalance;
            creditBalances[target] = targetNewCredits;
        } else if (state == RebaseOptions.YieldDelegationTarget) {
            uint256 newCredits = _balanceToRebasingCredits(
                newBalance + creditBalances[yieldFrom[_account]]
            );
            rebasingCreditsDiff =
                newCredits.toInt256() -
                creditBalances[_account].toInt256();
            creditBalances[_account] = newCredits;
        } else {
            _autoMigrate(_account);
            uint256 alternativeCreditsPerTokenMem = alternativeCreditsPerToken[
                _account
            ];
            if (alternativeCreditsPerTokenMem > 0) {
                nonRebasingSupplyDiff = _balanceChange;
                if (alternativeCreditsPerTokenMem != 1e18) {
                    alternativeCreditsPerToken[_account] = 1e18;
                }
                creditBalances[_account] = newBalance;
            } else {
                uint256 newCredits = _balanceToRebasingCredits(newBalance);
                rebasingCreditsDiff =
                    newCredits.toInt256() -
                    creditBalances[_account].toInt256();
                creditBalances[_account] = newCredits;
            }
        }
    }

    function _adjustGlobals(
        int256 _rebasingCreditsDiff,
        int256 _nonRebasingSupplyDiff
    ) internal {
        if (_rebasingCreditsDiff != 0) {
            rebasingCredits_ = (rebasingCredits_.toInt256() +
                _rebasingCreditsDiff).toUint256();
        }
        if (_nonRebasingSupplyDiff != 0) {
            nonRebasingSupply = (nonRebasingSupply.toInt256() +
                _nonRebasingSupplyDiff).toUint256();
        }
    }

    /**
     * @notice Function to check the amount of tokens that _owner has allowed
     *      to `_spender`.
     * @param _owner The address which owns the funds.
     * @param _spender The address which will spend the funds.
     * @return The number of tokens still available for the _spender.
     */
    function allowance(address _owner, address _spender)
        external
        view
        returns (uint256)
    {
        return allowances[_owner][_spender];
    }

    /**
     * @notice Approve the passed address to spend the specified amount of
     *      tokens on behalf of msg.sender.
     * @param _spender The address which will spend the funds.
     * @param _value The amount of tokens to be spent.
     * @return true on success.
     */
    function approve(address _spender, uint256 _value) external returns (bool) {
        allowances[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @notice Creates `_amount` tokens and assigns them to `_account`,
     *     increasing the total supply.
     */
    function mint(address _account, uint256 _amount) external onlyVault {
        require(_account != address(0), "Mint to the zero address");

        // Account
        (
            int256 toRebasingCreditsDiff,
            int256 toNonRebasingSupplyDiff
        ) = _adjustAccount(_account, _amount.toInt256());
        // Globals
        _adjustGlobals(toRebasingCreditsDiff, toNonRebasingSupplyDiff);
        totalSupply = totalSupply + _amount;

        require(totalSupply < MAX_SUPPLY, "Max supply");
        emit Transfer(address(0), _account, _amount);
    }

    /**
     * @notice Destroys `_amount` tokens from `_account`,
     *     reducing the total supply.
     */
    function burn(address _account, uint256 _amount) external onlyVault {
        require(_account != address(0), "Burn from the zero address");
        if (_amount == 0) {
            return;
        }

        // Account
        (
            int256 toRebasingCreditsDiff,
            int256 toNonRebasingSupplyDiff
        ) = _adjustAccount(_account, -_amount.toInt256());
        // Globals
        _adjustGlobals(toRebasingCreditsDiff, toNonRebasingSupplyDiff);
        totalSupply = totalSupply - _amount;

        emit Transfer(_account, address(0), _amount);
    }

    /**
     * @dev Get the credits per token for an account. Returns a fixed amount
     *      if the account is non-rebasing.
     * @param _account Address of the account.
     */
    function _creditsPerToken(address _account)
        internal
        view
        returns (uint256)
    {
        uint256 alternativeCreditsPerTokenMem = alternativeCreditsPerToken[
            _account
        ];
        if (alternativeCreditsPerTokenMem != 0) {
            return alternativeCreditsPerTokenMem;
        } else {
            return rebasingCreditsPerToken_;
        }
    }

    /**
     * @dev Auto migrate contracts to be non rebasing,
     *     unless they have opted into yield.
     * @param _account Address of the account.
     */
    function _autoMigrate(address _account) internal {
        uint256 codeLen = _account.code.length;
        bool isEOA = (codeLen == 0) ||
            (codeLen == 23 && bytes3(_account.code) == 0xef0100);
        // In previous code versions, contracts would not have had their
        // rebaseState[_account] set to RebaseOptions.NonRebasing when migrated
        // therefore we check the actual accounting used on the account as well.
        if (
            (!isEOA) &&
            rebaseState[_account] == RebaseOptions.NotSet &&
            alternativeCreditsPerToken[_account] == 0
        ) {
            _rebaseOptOut(_account);
        }
    }

    /**
     * @dev Calculates credits from contract's global rebasingCreditsPerToken_, and
     *      also balance that corresponds to those credits. The latter is important
     *      when adjusting the contract's global nonRebasingSupply to circumvent any
     *      possible rounding errors.
     *
     * @param _balance Balance of the account.
     */
    function _balanceToRebasingCredits(uint256 _balance)
        internal
        view
        returns (uint256 rebasingCredits)
    {
        // Rounds up, because we need to ensure that accounts always have
        // at least the balance that they should have.
        // Note this should always be used on an absolute account value,
        // not on a possibly negative diff, because then the rounding would be wrong.
        return ((_balance) * rebasingCreditsPerToken_ + 1e18 - 1) / 1e18;
    }

    /**
     * @notice The calling account will start receiving yield after a successful call.
     * @param _account Address of the account.
     */
    function governanceRebaseOptIn(address _account) external onlyGovernor {
        require(_account != address(0), "Zero address not allowed");
        _rebaseOptIn(_account);
    }

    /**
     * @notice The calling account will start receiving yield after a successful call.
     */
    function rebaseOptIn() external {
        _rebaseOptIn(msg.sender);
    }

    function _rebaseOptIn(address _account) internal {
        uint256 balance = balanceOf(_account);

        // prettier-ignore
        require(
            alternativeCreditsPerToken[_account] > 0 ||
                // Accounts may explicitly `rebaseOptIn` regardless of
                // accounting if they have a 0 balance.
                creditBalances[_account] == 0
            ,
            "Account must be non-rebasing"
        );
        RebaseOptions state = rebaseState[_account];
        // prettier-ignore
        require(
            state == RebaseOptions.StdNonRebasing ||
                state == RebaseOptions.NotSet,
            "Only standard non-rebasing accounts can opt in"
        );

        uint256 newCredits = _balanceToRebasingCredits(balance);

        // Account
        rebaseState[_account] = RebaseOptions.StdRebasing;
        alternativeCreditsPerToken[_account] = 0;
        creditBalances[_account] = newCredits;
        // Globals
        _adjustGlobals(newCredits.toInt256(), -balance.toInt256());

        emit AccountRebasingEnabled(_account);
    }

    /**
     * @notice The calling account will no longer receive yield
     */
    function rebaseOptOut() external {
        _rebaseOptOut(msg.sender);
    }

    function _rebaseOptOut(address _account) internal {
        require(
            alternativeCreditsPerToken[_account] == 0,
            "Account must be rebasing"
        );
        RebaseOptions state = rebaseState[_account];
        require(
            state == RebaseOptions.StdRebasing || state == RebaseOptions.NotSet,
            "Only standard rebasing accounts can opt out"
        );

        uint256 oldCredits = creditBalances[_account];
        uint256 balance = balanceOf(_account);

        // Account
        rebaseState[_account] = RebaseOptions.StdNonRebasing;
        alternativeCreditsPerToken[_account] = 1e18;
        creditBalances[_account] = balance;
        // Globals
        _adjustGlobals(-oldCredits.toInt256(), balance.toInt256());

        emit AccountRebasingDisabled(_account);
    }

    /**
     * @notice Distribute yield to users. This changes the exchange rate
     *  between "credits" and OUSD tokens to change rebasing user's balances.
     * @param _newTotalSupply New total supply of OUSD.
     */
    function changeSupply(uint256 _newTotalSupply) external onlyVault {
        require(totalSupply > 0, "Cannot increase 0 supply");

        if (totalSupply == _newTotalSupply) {
            emit TotalSupplyUpdatedHighres(
                totalSupply,
                rebasingCredits_,
                rebasingCreditsPerToken_
            );
            return;
        }

        totalSupply = _newTotalSupply > MAX_SUPPLY
            ? MAX_SUPPLY
            : _newTotalSupply;

        uint256 rebasingSupply = totalSupply - nonRebasingSupply;
        // round up in the favour of the protocol
        rebasingCreditsPerToken_ =
            (rebasingCredits_ * 1e18 + rebasingSupply - 1) /
            rebasingSupply;

        require(rebasingCreditsPerToken_ > 0, "Invalid change in supply");

        emit TotalSupplyUpdatedHighres(
            totalSupply,
            rebasingCredits_,
            rebasingCreditsPerToken_
        );
    }

    /*
     * @notice Send the yield from one account to another account.
     *         Each account keeps its own balances.
     */
    function delegateYield(address _from, address _to)
        external
        onlyGovernorOrStrategist
    {
        require(_from != address(0), "Zero from address not allowed");
        require(_to != address(0), "Zero to address not allowed");

        require(_from != _to, "Cannot delegate to self");
        require(
            yieldFrom[_to] == address(0) &&
                yieldTo[_to] == address(0) &&
                yieldFrom[_from] == address(0) &&
                yieldTo[_from] == address(0),
            "Blocked by existing yield delegation"
        );
        RebaseOptions stateFrom = rebaseState[_from];
        RebaseOptions stateTo = rebaseState[_to];

        require(
            stateFrom == RebaseOptions.NotSet ||
                stateFrom == RebaseOptions.StdNonRebasing ||
                stateFrom == RebaseOptions.StdRebasing,
            "Invalid rebaseState from"
        );

        require(
            stateTo == RebaseOptions.NotSet ||
                stateTo == RebaseOptions.StdNonRebasing ||
                stateTo == RebaseOptions.StdRebasing,
            "Invalid rebaseState to"
        );

        if (alternativeCreditsPerToken[_from] == 0) {
            _rebaseOptOut(_from);
        }
        if (alternativeCreditsPerToken[_to] > 0) {
            _rebaseOptIn(_to);
        }

        uint256 fromBalance = balanceOf(_from);
        uint256 toBalance = balanceOf(_to);
        uint256 oldToCredits = creditBalances[_to];
        uint256 newToCredits = _balanceToRebasingCredits(
            fromBalance + toBalance
        );

        // Set up the bidirectional links
        yieldTo[_from] = _to;
        yieldFrom[_to] = _from;

        // Local
        rebaseState[_from] = RebaseOptions.YieldDelegationSource;
        alternativeCreditsPerToken[_from] = 1e18;
        creditBalances[_from] = fromBalance;
        rebaseState[_to] = RebaseOptions.YieldDelegationTarget;
        creditBalances[_to] = newToCredits;

        // Global
        int256 creditsChange = newToCredits.toInt256() -
            oldToCredits.toInt256();
        _adjustGlobals(creditsChange, -(fromBalance).toInt256());
        emit YieldDelegated(_from, _to);
    }

    /*
     * @notice Stop sending the yield from one account to another account.
     */
    function undelegateYield(address _from) external onlyGovernorOrStrategist {
        // Require a delegation, which will also ensure a valid delegation
        require(yieldTo[_from] != address(0), "Zero address not allowed");

        address to = yieldTo[_from];
        uint256 fromBalance = balanceOf(_from);
        uint256 toBalance = balanceOf(to);
        uint256 oldToCredits = creditBalances[to];
        uint256 newToCredits = _balanceToRebasingCredits(toBalance);

        // Remove the bidirectional links
        yieldFrom[to] = address(0);
        yieldTo[_from] = address(0);

        // Local
        rebaseState[_from] = RebaseOptions.StdNonRebasing;
        // alternativeCreditsPerToken[from] already 1e18 from `delegateYield()`
        creditBalances[_from] = fromBalance;
        rebaseState[to] = RebaseOptions.StdRebasing;
        // alternativeCreditsPerToken[to] already 0 from `delegateYield()`
        creditBalances[to] = newToCredits;

        // Global
        int256 creditsChange = newToCredits.toInt256() -
            oldToCredits.toInt256();
        _adjustGlobals(creditsChange, fromBalance.toInt256());
        emit YieldUndelegated(_from, to);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

import { IBasicToken } from "../interfaces/IBasicToken.sol";

library Helpers {
    /**
     * @notice Fetch the `symbol()` from an ERC20 token
     * @dev Grabs the `symbol()` from a contract
     * @param _token Address of the ERC20 token
     * @return string Symbol of the ERC20 token
     */
    function getSymbol(address _token) internal view returns (string memory) {
        string memory symbol = IBasicToken(_token).symbol();
        return symbol;
    }

    /**
     * @notice Fetch the `decimals()` from an ERC20 token
     * @dev Grabs the `decimals()` from a contract and fails if
     *      the decimal value does not live within a certain range
     * @param _token Address of the ERC20 token
     * @return uint256 Decimals of the ERC20 token
     */
    function getDecimals(address _token) internal view returns (uint256) {
        uint256 decimals = IBasicToken(_token).decimals();
        require(
            decimals >= 4 && decimals <= 18,
            "Token must have sufficient decimal places"
        );

        return decimals;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title Base contract any contracts that need to initialize state after deployment.
 * @author Origin Protocol Inc
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(
            initializing || !initialized,
            "Initializable: contract is already initialized"
        );

        bool isTopLevelCall = !initializing;
        if (isTopLevelCall) {
            initializing = true;
            initialized = true;
        }

        _;

        if (isTopLevelCall) {
            initializing = false;
        }
    }

    uint256[50] private ______gap;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

import { SafeMath } from "@openzeppelin/contracts/utils/math/SafeMath.sol";

// Based on StableMath from Stability Labs Pty. Ltd.
// https://github.com/mstable/mStable-contracts/blob/master/contracts/shared/StableMath.sol

library StableMath {
    using SafeMath for uint256;

    /**
     * @dev Scaling unit for use in specific calculations,
     * where 1 * 10**18, or 1e18 represents a unit '1'
     */
    uint256 private constant FULL_SCALE = 1e18;

    /***************************************
                    Helpers
    ****************************************/

    /**
     * @dev Adjust the scale of an integer
     * @param to Decimals to scale to
     * @param from Decimals to scale from
     */
    function scaleBy(
        uint256 x,
        uint256 to,
        uint256 from
    ) internal pure returns (uint256) {
        if (to > from) {
            x = x.mul(10**(to - from));
        } else if (to < from) {
            // slither-disable-next-line divide-before-multiply
            x = x.div(10**(from - to));
        }
        return x;
    }

    /***************************************
               Precise Arithmetic
    ****************************************/

    /**
     * @dev Multiplies two precise units, and then truncates by the full scale
     * @param x Left hand input to multiplication
     * @param y Right hand input to multiplication
     * @return Result after multiplying the two inputs and then dividing by the shared
     *         scale unit
     */
    function mulTruncate(uint256 x, uint256 y) internal pure returns (uint256) {
        return mulTruncateScale(x, y, FULL_SCALE);
    }

    /**
     * @dev Multiplies two precise units, and then truncates by the given scale. For example,
     * when calculating 90% of 10e18, (10e18 * 9e17) / 1e18 = (9e36) / 1e18 = 9e18
     * @param x Left hand input to multiplication
     * @param y Right hand input to multiplication
     * @param scale Scale unit
     * @return Result after multiplying the two inputs and then dividing by the shared
     *         scale unit
     */
    function mulTruncateScale(
        uint256 x,
        uint256 y,
        uint256 scale
    ) internal pure returns (uint256) {
        // e.g. assume scale = fullScale
        // z = 10e18 * 9e17 = 9e36
        uint256 z = x.mul(y);
        // return 9e36 / 1e18 = 9e18
        return z.div(scale);
    }

    /**
     * @dev Multiplies two precise units, and then truncates by the full scale, rounding up the result
     * @param x Left hand input to multiplication
     * @param y Right hand input to multiplication
     * @return Result after multiplying the two inputs and then dividing by the shared
     *          scale unit, rounded up to the closest base unit.
     */
    function mulTruncateCeil(uint256 x, uint256 y)
        internal
        pure
        returns (uint256)
    {
        // e.g. 8e17 * 17268172638 = 138145381104e17
        uint256 scaled = x.mul(y);
        // e.g. 138145381104e17 + 9.99...e17 = 138145381113.99...e17
        uint256 ceil = scaled.add(FULL_SCALE.sub(1));
        // e.g. 13814538111.399...e18 / 1e18 = 13814538111
        return ceil.div(FULL_SCALE);
    }

    /**
     * @dev Precisely divides two units, by first scaling the left hand operand. Useful
     *      for finding percentage weightings, i.e. 8e18/10e18 = 80% (or 8e17)
     * @param x Left hand input to division
     * @param y Right hand input to division
     * @return Result after multiplying the left operand by the scale, and
     *         executing the division on the right hand input.
     */
    function divPrecisely(uint256 x, uint256 y)
        internal
        pure
        returns (uint256)
    {
        // e.g. 8e18 * 1e18 = 8e36
        uint256 z = x.mul(FULL_SCALE);
        // e.g. 8e36 / 10e18 = 8e17
        return z.div(y);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol";

import { StableMath } from "../utils/StableMath.sol";
import { VaultCore } from "./VaultCore.sol";
import { IStrategy } from "../interfaces/IStrategy.sol";

/**
 * @title OETH VaultCore Contract
 * @author Origin Protocol Inc
 */
contract OETHVaultCore is VaultCore {
    using SafeERC20 for IERC20;
    using StableMath for uint256;

    address public immutable weth;
    uint256 public wethAssetIndex;

    // For future use (because OETHBaseVaultCore inherits from this)
    uint256[50] private __gap;

    constructor(address _weth) {
        weth = _weth;
    }

    /**
     * @dev Caches WETH's index in `allAssets` variable.
     *      Reduces gas usage by redeem by caching that.
     */
    function cacheWETHAssetIndex() external onlyGovernor {
        uint256 assetCount = allAssets.length;
        for (uint256 i; i < assetCount; ++i) {
            if (allAssets[i] == weth) {
                wethAssetIndex = i;
                break;
            }
        }

        require(allAssets[wethAssetIndex] == weth, "Invalid WETH Asset Index");
    }

    // @inheritdoc VaultCore
    function mintForStrategy(uint256 amount)
        external
        override
        whenNotCapitalPaused
    {
        require(
            strategies[msg.sender].isSupported == true,
            "Unsupported strategy"
        );
        require(
            isMintWhitelistedStrategy[msg.sender] == true,
            "Not whitelisted strategy"
        );

        emit Mint(msg.sender, amount);

        // Mint matching amount of OTokens
        oUSD.mint(msg.sender, amount);
    }

    // @inheritdoc VaultCore
    function burnForStrategy(uint256 amount)
        external
        override
        whenNotCapitalPaused
    {
        require(
            strategies[msg.sender].isSupported == true,
            "Unsupported strategy"
        );
        require(
            isMintWhitelistedStrategy[msg.sender] == true,
            "Not whitelisted strategy"
        );

        emit Redeem(msg.sender, amount);

        // Burn OTokens
        oUSD.burn(msg.sender, amount);
    }

    // @inheritdoc VaultCore
    // slither-disable-start reentrancy-no-eth
    function _mint(
        address _asset,
        uint256 _amount,
        uint256 _minimumOusdAmount
    ) internal virtual override {
        require(_asset == weth, "Unsupported asset for minting");
        require(_amount > 0, "Amount must be greater than 0");
        require(
            _amount >= _minimumOusdAmount,
            "Mint amount lower than minimum"
        );

        emit Mint(msg.sender, _amount);

        // Rebase must happen before any transfers occur.
        if (!rebasePaused && _amount >= rebaseThreshold) {
            _rebase();
        }

        // Mint oTokens
        oUSD.mint(msg.sender, _amount);

        // Transfer the deposited coins to the vault
        IERC20(_asset).safeTransferFrom(msg.sender, address(this), _amount);

        // Give priority to the withdrawal queue for the new WETH liquidity
        _addWithdrawalQueueLiquidity();

        // Auto-allocate if necessary
        if (_amount >= autoAllocateThreshold) {
            _allocate();
        }
    }

    // slither-disable-end reentrancy-no-eth

    // @inheritdoc VaultCore
    function _calculateRedeemOutputs(uint256 _amount)
        internal
        view
        virtual
        override
        returns (uint256[] memory outputs)
    {
        // Overrides `VaultCore._calculateRedeemOutputs` to redeem with only
        // WETH instead of LST-mix. Doesn't change the function signature
        // for backward compatibility

        // Calculate redeem fee
        if (redeemFeeBps > 0) {
            uint256 redeemFee = _amount.mulTruncateScale(redeemFeeBps, 1e4);
            _amount = _amount - redeemFee;
        }

        // Ensure that the WETH index is cached
        uint256 _wethAssetIndex = wethAssetIndex;
        require(
            allAssets[_wethAssetIndex] == weth,
            "WETH Asset index not cached"
        );

        outputs = new uint256[](allAssets.length);
        outputs[_wethAssetIndex] = _amount;
    }

    // @inheritdoc VaultCore
    function _redeem(uint256 _amount, uint256 _minimumUnitAmount)
        internal
        virtual
        override
    {
        // Override `VaultCore._redeem` to simplify it. Gets rid of oracle
        // usage and looping through all assets for LST-mix redeem. Instead
        // does a simple WETH-only redeem.
        emit Redeem(msg.sender, _amount);

        if (_amount == 0) {
            return;
        }

        // Amount excluding fees
        // No fee for the strategist or the governor, makes it easier to do operations
        uint256 amountMinusFee = (msg.sender == strategistAddr || isGovernor())
            ? _amount
            : _calculateRedeemOutputs(_amount)[wethAssetIndex];

        require(
            amountMinusFee >= _minimumUnitAmount,
            "Redeem amount lower than minimum"
        );

        // Is there enough WETH in the Vault available after accounting for the withdrawal queue
        require(_wethAvailable() >= amountMinusFee, "Liquidity error");

        // Transfer WETH minus the fee to the redeemer
        IERC20(weth).safeTransfer(msg.sender, amountMinusFee);

        // Burn OETH from user (including fees)
        oUSD.burn(msg.sender, _amount);

        // Prevent insolvency
        _postRedeem(_amount);
    }

    /**
     * @notice Request an asynchronous withdrawal of WETH in exchange for OETH.
     * The OETH is burned on request and the WETH is transferred to the withdrawer on claim.
     * This request can be claimed once the withdrawal queue's `claimable` amount
     * is greater than or equal this request's `queued` amount.
     * There is a minimum of 10 minutes before a request can be claimed. After that, the request just needs
     * enough WETH liquidity in the Vault to satisfy all the outstanding requests to that point in the queue.
     * OETH is converted to WETH at 1:1.
     * @param _amount Amount of OETH to burn.
     * @return requestId Unique ID for the withdrawal request
     * @return queued Cumulative total of all WETH queued including already claimed requests.
     */
    function requestWithdrawal(uint256 _amount)
        external
        virtual
        whenNotCapitalPaused
        nonReentrant
        returns (uint256 requestId, uint256 queued)
    {
        require(withdrawalClaimDelay > 0, "Async withdrawals not enabled");

        // The check that the requester has enough OETH is done in to later burn call

        requestId = withdrawalQueueMetadata.nextWithdrawalIndex;
        queued = withdrawalQueueMetadata.queued + _amount;

        // Store the next withdrawal request
        withdrawalQueueMetadata.nextWithdrawalIndex = SafeCast.toUint128(
            requestId + 1
        );
        // Store the updated queued amount which reserves WETH in the withdrawal queue
        // and reduces the vault's total assets
        withdrawalQueueMetadata.queued = SafeCast.toUint128(queued);
        // Store the user's withdrawal request
        withdrawalRequests[requestId] = WithdrawalRequest({
            withdrawer: msg.sender,
            claimed: false,
            timestamp: uint40(block.timestamp),
            amount: SafeCast.toUint128(_amount),
            queued: SafeCast.toUint128(queued)
        });

        // Burn the user's OETH
        oUSD.burn(msg.sender, _amount);

        // Prevent withdrawal if the vault is solvent by more than the allowed percentage
        _postRedeem(_amount);

        emit WithdrawalRequested(msg.sender, requestId, _amount, queued);
    }

    // slither-disable-start reentrancy-no-eth
    /**
     * @notice Claim a previously requested withdrawal once it is claimable.
     * This request can be claimed once the withdrawal queue's `claimable` amount
     * is greater than or equal this request's `queued` amount and 10 minutes has passed.
     * If the requests is not claimable, the transaction will revert with `Queue pending liquidity`.
     * If the request is not older than 10 minutes, the transaction will revert with `Claim delay not met`.
     * OETH is converted to WETH at 1:1.
     * @param _requestId Unique ID for the withdrawal request
     * @return amount Amount of WETH transferred to the withdrawer
     */
    function claimWithdrawal(uint256 _requestId)
        external
        virtual
        whenNotCapitalPaused
        nonReentrant
        returns (uint256 amount)
    {
        // Try and get more liquidity if there is not enough available
        if (
            withdrawalRequests[_requestId].queued >
            withdrawalQueueMetadata.claimable
        ) {
            // Add any WETH to the withdrawal queue
            // this needs to remain here as:
            //  - Vault can be funded and `addWithdrawalQueueLiquidity` is not externally called
            //  - funds can be withdrawn from a strategy
            //
            // Those funds need to be added to withdrawal queue liquidity
            _addWithdrawalQueueLiquidity();
        }

        amount = _claimWithdrawal(_requestId);

        // transfer WETH from the vault to the withdrawer
        IERC20(weth).safeTransfer(msg.sender, amount);

        // Prevent insolvency
        _postRedeem(amount);
    }

    // slither-disable-end reentrancy-no-eth

    /**
     * @notice Claim a previously requested withdrawals once they are claimable.
     * This requests can be claimed once the withdrawal queue's `claimable` amount
     * is greater than or equal each request's `queued` amount and 10 minutes has passed.
     * If one of the requests is not claimable, the whole transaction will revert with `Queue pending liquidity`.
     * If one of the requests is not older than 10 minutes,
     * the whole transaction will revert with `Claim delay not met`.
     * @param _requestIds Unique ID of each withdrawal request
     * @return amounts Amount of WETH received for each request
     * @return totalAmount Total amount of WETH transferred to the withdrawer
     */
    function claimWithdrawals(uint256[] calldata _requestIds)
        external
        virtual
        whenNotCapitalPaused
        nonReentrant
        returns (uint256[] memory amounts, uint256 totalAmount)
    {
        // Add any WETH to the withdrawal queue
        // this needs to remain here as:
        //  - Vault can be funded and `addWithdrawalQueueLiquidity` is not externally called
        //  - funds can be withdrawn from a strategy
        //
        // Those funds need to be added to withdrawal queue liquidity
        _addWithdrawalQueueLiquidity();

        amounts = new uint256[](_requestIds.length);
        for (uint256 i; i < _requestIds.length; ++i) {
            amounts[i] = _claimWithdrawal(_requestIds[i]);
            totalAmount += amounts[i];
        }

        // transfer all the claimed WETH from the vault to the withdrawer
        IERC20(weth).safeTransfer(msg.sender, totalAmount);

        // Prevent insolvency
        _postRedeem(totalAmount);
    }

    function _claimWithdrawal(uint256 requestId)
        internal
        returns (uint256 amount)
    {
        require(withdrawalClaimDelay > 0, "Async withdrawals not enabled");

        // Load the structs from storage into memory
        WithdrawalRequest memory request = withdrawalRequests[requestId];
        WithdrawalQueueMetadata memory queue = withdrawalQueueMetadata;

        require(
            request.timestamp + withdrawalClaimDelay <= block.timestamp,
            "Claim delay not met"
        );
        // If there isn't enough reserved liquidity in the queue to claim
        require(request.queued <= queue.claimable, "Queue pending liquidity");
        require(request.withdrawer == msg.sender, "Not requester");
        require(request.claimed == false, "Already claimed");

        // Store the request as claimed
        withdrawalRequests[requestId].claimed = true;
        // Store the updated claimed amount
        withdrawalQueueMetadata.claimed = queue.claimed + request.amount;

        emit WithdrawalClaimed(msg.sender, requestId, request.amount);

        return request.amount;
    }

    /// @notice Adds WETH to the withdrawal queue if there is a funding shortfall.
    /// @dev is called from the Native Staking strategy when validator withdrawals are processed.
    /// It also called before any WETH is allocated to a strategy.
    function addWithdrawalQueueLiquidity() external {
        _addWithdrawalQueueLiquidity();
    }

    /// @dev Adds WETH to the withdrawal queue if there is a funding shortfall.
    /// This assumes 1 WETH equal 1 OETH.
    function _addWithdrawalQueueLiquidity()
        internal
        returns (uint256 addedClaimable)
    {
        WithdrawalQueueMetadata memory queue = withdrawalQueueMetadata;

        // Check if the claimable WETH is less than the queued amount
        uint256 queueShortfall = queue.queued - queue.claimable;

        // No need to do anything is the withdrawal queue is full funded
        if (queueShortfall == 0) {
            return 0;
        }

        uint256 wethBalance = IERC20(weth).balanceOf(address(this));

        // Of the claimable withdrawal requests, how much is unclaimed?
        // That is, the amount of WETH that is currently allocated for the withdrawal queue
        uint256 allocatedWeth = queue.claimable - queue.claimed;

        // If there is no unallocated WETH then there is nothing to add to the queue
        if (wethBalance <= allocatedWeth) {
            return 0;
        }

        uint256 unallocatedWeth = wethBalance - allocatedWeth;

        // the new claimable amount is the smaller of the queue shortfall or unallocated weth
        addedClaimable = queueShortfall < unallocatedWeth
            ? queueShortfall
            : unallocatedWeth;
        uint256 newClaimable = queue.claimable + addedClaimable;

        // Store the new claimable amount back to storage
        withdrawalQueueMetadata.claimable = SafeCast.toUint128(newClaimable);

        // emit a WithdrawalClaimable event
        emit WithdrawalClaimable(newClaimable, addedClaimable);
    }

    /***************************************
                View Functions
    ****************************************/

    /// @dev Calculate how much WETH in the vault is not reserved for the withdrawal queue.
    // That is, it is available to be redeemed or deposited into a strategy.
    function _wethAvailable() internal view returns (uint256 wethAvailable) {
        WithdrawalQueueMetadata memory queue = withdrawalQueueMetadata;

        // The amount of WETH that is still to be claimed in the withdrawal queue
        uint256 outstandingWithdrawals = queue.queued - queue.claimed;

        // The amount of sitting in WETH in the vault
        uint256 wethBalance = IERC20(weth).balanceOf(address(this));

        // If there is not enough WETH in the vault to cover the outstanding withdrawals
        if (wethBalance <= outstandingWithdrawals) {
            return 0;
        }

        return wethBalance - outstandingWithdrawals;
    }

    /// @dev Get the balance of an asset held in Vault and all strategies
    /// less any WETH that is reserved for the withdrawal queue.
    /// WETH is the only asset that can return a non-zero balance.
    /// All other assets will return 0 even if there is some dust amounts left in the Vault.
    /// For example, there is 1 wei left of stETH in the OETH Vault but will return 0 in this function.
    ///
    /// If there is not enough WETH in the vault and all strategies to cover all outstanding
    /// withdrawal requests then return a WETH balance of 0
    function _checkBalance(address _asset)
        internal
        view
        override
        returns (uint256 balance)
    {
        if (_asset != weth) {
            return 0;
        }

        // Get the WETH in the vault and the strategies
        balance = super._checkBalance(_asset);

        WithdrawalQueueMetadata memory queue = withdrawalQueueMetadata;

        // If the vault becomes insolvent enough that the total value in the vault and all strategies
        // is less than the outstanding withdrawals.
        // For example, there was a mass slashing event and most users request a withdrawal.
        if (balance + queue.claimed < queue.queued) {
            return 0;
        }

        // Need to remove WETH that is reserved for the withdrawal queue
        return balance + queue.claimed - queue.queued;
    }

    /**
     * @notice Allocate unallocated funds on Vault to strategies.
     **/
    function allocate() external override whenNotCapitalPaused nonReentrant {
        // Add any unallocated WETH to the withdrawal queue first
        _addWithdrawalQueueLiquidity();

        _allocate();
    }

    /// @dev Allocate WETH to the default WETH strategy if there is excess to the Vault buffer.
    /// This is called from either `mint` or `allocate` and assumes `_addWithdrawalQueueLiquidity`
    /// has been called before this function.
    function _allocate() internal override {
        // No need to do anything if no default strategy for WETH
        address depositStrategyAddr = assetDefaultStrategies[weth];
        if (depositStrategyAddr == address(0)) return;

        uint256 wethAvailableInVault = _wethAvailable();
        // No need to do anything if there isn't any WETH in the vault to allocate
        if (wethAvailableInVault == 0) return;

        // Calculate the target buffer for the vault using the total supply
        uint256 totalSupply = oUSD.totalSupply();
        uint256 targetBuffer = totalSupply.mulTruncate(vaultBuffer);

        // If available WETH in the Vault is below or equal the target buffer then there's nothing to allocate
        if (wethAvailableInVault <= targetBuffer) return;

        // The amount of assets to allocate to the default strategy
        uint256 allocateAmount = wethAvailableInVault - targetBuffer;

        IStrategy strategy = IStrategy(depositStrategyAddr);
        // Transfer WETH to the strategy and call the strategy's deposit function
        IERC20(weth).safeTransfer(address(strategy), allocateAmount);
        strategy.deposit(weth, allocateAmount);

        emit AssetAllocated(weth, depositStrategyAddr, allocateAmount);
    }

    /// @dev The total value of all WETH held by the vault and all its strategies
    /// less any WETH that is reserved for the withdrawal queue.
    ///
    // If there is not enough WETH in the vault and all strategies to cover all outstanding
    // withdrawal requests then return a total value of 0.
    function _totalValue() internal view override returns (uint256 value) {
        // As WETH is the only asset, just return the WETH balance
        return _checkBalance(weth);
    }

    /// @dev Only WETH is supported in the OETH Vault so return the WETH balance only
    /// Any ETH balances in the Vault will be ignored.
    /// Amounts from previously supported vault assets will also be ignored.
    /// For example, there is 1 wei left of stETH in the OETH Vault but is will be ignored.
    function _totalValueInVault()
        internal
        view
        override
        returns (uint256 value)
    {
        value = IERC20(weth).balanceOf(address(this));
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title OToken VaultCore contract
 * @notice The Vault contract stores assets. On a deposit, OTokens will be minted
           and sent to the depositor. On a withdrawal, OTokens will be burned and
           assets will be sent to the withdrawer. The Vault accepts deposits of
           interest from yield bearing strategies which will modify the supply
           of OTokens.
 * @author Origin Protocol Inc
 */

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

import { StableMath } from "../utils/StableMath.sol";
import { IOracle } from "../interfaces/IOracle.sol";
import { IGetExchangeRateToken } from "../interfaces/IGetExchangeRateToken.sol";

import "./VaultInitializer.sol";

contract VaultCore is VaultInitializer {
    using SafeERC20 for IERC20;
    using StableMath for uint256;
    /// @dev max signed int
    uint256 internal constant MAX_INT = uint256(type(int256).max);

    /**
     * @dev Verifies that the rebasing is not paused.
     */
    modifier whenNotRebasePaused() {
        require(!rebasePaused, "Rebasing paused");
        _;
    }

    /**
     * @dev Verifies that the deposits are not paused.
     */
    modifier whenNotCapitalPaused() {
        require(!capitalPaused, "Capital paused");
        _;
    }

    /**
     * @dev Verifies that the caller is the AMO strategy.
     */
    modifier onlyOusdMetaStrategy() {
        require(
            msg.sender == ousdMetaStrategy,
            "Caller is not the OUSD meta strategy"
        );
        _;
    }

    /**
     * @notice Deposit a supported asset and mint OTokens.
     * @param _asset Address of the asset being deposited
     * @param _amount Amount of the asset being deposited
     * @param _minimumOusdAmount Minimum OTokens to mint
     */
    function mint(
        address _asset,
        uint256 _amount,
        uint256 _minimumOusdAmount
    ) external whenNotCapitalPaused nonReentrant {
        _mint(_asset, _amount, _minimumOusdAmount);
    }

    /**
     * @dev Deposit a supported asset and mint OTokens.
     * @param _asset Address of the asset being deposited
     * @param _amount Amount of the asset being deposited
     * @param _minimumOusdAmount Minimum OTokens to mint
     */
    function _mint(
        address _asset,
        uint256 _amount,
        uint256 _minimumOusdAmount
    ) internal virtual {
        require(assets[_asset].isSupported, "Asset is not supported");
        require(_amount > 0, "Amount must be greater than 0");

        uint256 units = _toUnits(_amount, _asset);
        uint256 unitPrice = _toUnitPrice(_asset, true);
        uint256 priceAdjustedDeposit = (units * unitPrice) / 1e18;

        if (_minimumOusdAmount > 0) {
            require(
                priceAdjustedDeposit >= _minimumOusdAmount,
                "Mint amount lower than minimum"
            );
        }

        emit Mint(msg.sender, priceAdjustedDeposit);

        // Rebase must happen before any transfers occur.
        if (priceAdjustedDeposit >= rebaseThreshold && !rebasePaused) {
            _rebase();
        }

        // Mint matching amount of OTokens
        oUSD.mint(msg.sender, priceAdjustedDeposit);

        // Transfer the deposited coins to the vault
        IERC20 asset = IERC20(_asset);
        asset.safeTransferFrom(msg.sender, address(this), _amount);

        if (priceAdjustedDeposit >= autoAllocateThreshold) {
            _allocate();
        }
    }

    /**
     * @notice Mint OTokens for a Metapool Strategy
     * @param _amount Amount of the asset being deposited
     *
     * Notice: can't use `nonReentrant` modifier since the `mint` function can
     * call `allocate`, and that can trigger `ConvexOUSDMetaStrategy` to call this function
     * while the execution of the `mint` has not yet completed -> causing a `nonReentrant` collision.
     *
     * Also important to understand is that this is a limitation imposed by the test suite.
     * Production / mainnet contracts should never be configured in a way where mint/redeem functions
     * that are moving funds between the Vault and end user wallets can influence strategies
     * utilizing this function.
     */
    function mintForStrategy(uint256 _amount)
        external
        virtual
        whenNotCapitalPaused
        onlyOusdMetaStrategy
    {
        require(_amount < MAX_INT, "Amount too high");

        emit Mint(msg.sender, _amount);

        // safe to cast because of the require check at the beginning of the function
        netOusdMintedForStrategy += int256(_amount);

        require(
            abs(netOusdMintedForStrategy) < netOusdMintForStrategyThreshold,
            "Minted ousd surpassed netOusdMintForStrategyThreshold."
        );

        // Mint matching amount of OTokens
        oUSD.mint(msg.sender, _amount);
    }

    // In memoriam

    /**
     * @notice Withdraw a supported asset and burn OTokens.
     * @param _amount Amount of OTokens to burn
     * @param _minimumUnitAmount Minimum stablecoin units to receive in return
     */
    function redeem(uint256 _amount, uint256 _minimumUnitAmount)
        external
        whenNotCapitalPaused
        nonReentrant
    {
        _redeem(_amount, _minimumUnitAmount);
    }

    /**
     * @notice Withdraw a supported asset and burn OTokens.
     * @param _amount Amount of OTokens to burn
     * @param _minimumUnitAmount Minimum stablecoin units to receive in return
     */
    function _redeem(uint256 _amount, uint256 _minimumUnitAmount)
        internal
        virtual
    {
        // Calculate redemption outputs
        uint256[] memory outputs = _calculateRedeemOutputs(_amount);

        emit Redeem(msg.sender, _amount);

        // Send outputs
        uint256 assetCount = allAssets.length;
        for (uint256 i = 0; i < assetCount; ++i) {
            if (outputs[i] == 0) continue;

            address assetAddr = allAssets[i];

            if (IERC20(assetAddr).balanceOf(address(this)) >= outputs[i]) {
                // Use Vault funds first if sufficient
                IERC20(assetAddr).safeTransfer(msg.sender, outputs[i]);
            } else {
                address strategyAddr = assetDefaultStrategies[assetAddr];
                if (strategyAddr != address(0)) {
                    // Nothing in Vault, but something in Strategy, send from there
                    IStrategy strategy = IStrategy(strategyAddr);
                    strategy.withdraw(msg.sender, assetAddr, outputs[i]);
                } else {
                    // Cant find funds anywhere
                    revert("Liquidity error");
                }
            }
        }

        if (_minimumUnitAmount > 0) {
            uint256 unitTotal = 0;
            for (uint256 i = 0; i < outputs.length; ++i) {
                unitTotal += _toUnits(outputs[i], allAssets[i]);
            }
            require(
                unitTotal >= _minimumUnitAmount,
                "Redeem amount lower than minimum"
            );
        }

        oUSD.burn(msg.sender, _amount);

        _postRedeem(_amount);
    }

    function _postRedeem(uint256 _amount) internal {
        // Until we can prove that we won't affect the prices of our assets
        // by withdrawing them, this should be here.
        // It's possible that a strategy was off on its asset total, perhaps
        // a reward token sold for more or for less than anticipated.
        uint256 totalUnits = 0;
        if (_amount >= rebaseThreshold && !rebasePaused) {
            totalUnits = _rebase();
        } else {
            totalUnits = _totalValue();
        }

        // Check that the OTokens are backed by enough assets
        if (maxSupplyDiff > 0) {
            // If there are more outstanding withdrawal requests than assets in the vault and strategies
            // then the available assets will be negative and totalUnits will be rounded up to zero.
            // As we don't know the exact shortfall amount, we will reject all redeem and withdrawals
            require(totalUnits > 0, "Too many outstanding requests");

            // Allow a max difference of maxSupplyDiff% between
            // backing assets value and OUSD total supply
            uint256 diff = oUSD.totalSupply().divPrecisely(totalUnits);
            require(
                (diff > 1e18 ? diff - 1e18 : 1e18 - diff) <= maxSupplyDiff,
                "Backing supply liquidity error"
            );
        }
    }

    /**
     * @notice Burn OTokens for Metapool Strategy
     * @param _amount Amount of OUSD to burn
     *
     * @dev Notice: can't use `nonReentrant` modifier since the `redeem` function could
     * require withdrawal on `ConvexOUSDMetaStrategy` and that one can call `burnForStrategy`
     * while the execution of the `redeem` has not yet completed -> causing a `nonReentrant` collision.
     *
     * Also important to understand is that this is a limitation imposed by the test suite.
     * Production / mainnet contracts should never be configured in a way where mint/redeem functions
     * that are moving funds between the Vault and end user wallets can influence strategies
     * utilizing this function.
     */
    function burnForStrategy(uint256 _amount)
        external
        virtual
        whenNotCapitalPaused
        onlyOusdMetaStrategy
    {
        require(_amount < MAX_INT, "Amount too high");

        emit Redeem(msg.sender, _amount);

        // safe to cast because of the require check at the beginning of the function
        netOusdMintedForStrategy -= int256(_amount);

        require(
            abs(netOusdMintedForStrategy) < netOusdMintForStrategyThreshold,
            "Attempting to burn too much OUSD."
        );

        // Burn OTokens
        oUSD.burn(msg.sender, _amount);
    }

    /**
     * @notice Allocate unallocated funds on Vault to strategies.
     **/
    function allocate() external virtual whenNotCapitalPaused nonReentrant {
        _allocate();
    }

    /**
     * @dev Allocate unallocated funds on Vault to strategies.
     **/
    function _allocate() internal virtual {
        uint256 vaultValue = _totalValueInVault();
        // Nothing in vault to allocate
        if (vaultValue == 0) return;
        uint256 strategiesValue = _totalValueInStrategies();
        // We have a method that does the same as this, gas optimisation
        uint256 calculatedTotalValue = vaultValue + strategiesValue;

        // We want to maintain a buffer on the Vault so calculate a percentage
        // modifier to multiply each amount being allocated by to enforce the
        // vault buffer
        uint256 vaultBufferModifier;
        if (strategiesValue == 0) {
            // Nothing in Strategies, allocate 100% minus the vault buffer to
            // strategies
            vaultBufferModifier = uint256(1e18) - vaultBuffer;
        } else {
            vaultBufferModifier =
                (vaultBuffer * calculatedTotalValue) /
                vaultValue;
            if (1e18 > vaultBufferModifier) {
                // E.g. 1e18 - (1e17 * 10e18)/5e18 = 8e17
                // (5e18 * 8e17) / 1e18 = 4e18 allocated from Vault
                vaultBufferModifier = uint256(1e18) - vaultBufferModifier;
            } else {
                // We need to let the buffer fill
                return;
            }
        }
        if (vaultBufferModifier == 0) return;

        // Iterate over all assets in the Vault and allocate to the appropriate
        // strategy
        uint256 assetCount = allAssets.length;
        for (uint256 i = 0; i < assetCount; ++i) {
            IERC20 asset = IERC20(allAssets[i]);
            uint256 assetBalance = asset.balanceOf(address(this));
            // No balance, nothing to do here
            if (assetBalance == 0) continue;

            // Multiply the balance by the vault buffer modifier and truncate
            // to the scale of the asset decimals
            uint256 allocateAmount = assetBalance.mulTruncate(
                vaultBufferModifier
            );

            address depositStrategyAddr = assetDefaultStrategies[
                address(asset)
            ];

            if (depositStrategyAddr != address(0) && allocateAmount > 0) {
                IStrategy strategy = IStrategy(depositStrategyAddr);
                // Transfer asset to Strategy and call deposit method to
                // mint or take required action
                asset.safeTransfer(address(strategy), allocateAmount);
                strategy.deposit(address(asset), allocateAmount);
                emit AssetAllocated(
                    address(asset),
                    depositStrategyAddr,
                    allocateAmount
                );
            }
        }
    }

    /**
     * @notice Calculate the total value of assets held by the Vault and all
     *      strategies and update the supply of OTokens.
     */
    function rebase() external virtual nonReentrant {
        _rebase();
    }

    /**
     * @dev Calculate the total value of assets held by the Vault and all
     *      strategies and update the supply of OTokens, optionally sending a
     *      portion of the yield to the trustee.
     * @return totalUnits Total balance of Vault in units
     */
    function _rebase() internal whenNotRebasePaused returns (uint256) {
        uint256 supply = oUSD.totalSupply();
        uint256 vaultValue = _totalValue();
        // If no supply yet, do not rebase
        if (supply == 0) {
            return vaultValue;
        }

        // Calculate yield and new supply
        (uint256 yield, uint256 targetRate) = _nextYield(supply, vaultValue);
        uint256 newSupply = supply + yield;
        // Only rebase upwards and if we have enough backing funds
        if (newSupply <= supply || newSupply > vaultValue) {
            return vaultValue;
        }

        rebasePerSecondTarget = uint64(_min(targetRate, type(uint64).max));
        lastRebase = uint64(block.timestamp); // Intentional cast

        // Fee collection on yield
        address _trusteeAddress = trusteeAddress; // gas savings
        uint256 fee = 0;
        if (_trusteeAddress != address(0)) {
            fee = (yield * trusteeFeeBps) / 1e4;
            if (fee > 0) {
                require(fee < yield, "Fee must not be greater than yield");
                oUSD.mint(_trusteeAddress, fee);
            }
        }
        emit YieldDistribution(_trusteeAddress, yield, fee);

        // Only ratchet OToken supply upwards
        // Final check uses latest totalSupply
        if (newSupply > oUSD.totalSupply()) {
            oUSD.changeSupply(newSupply);
        }
        return vaultValue;
    }

    /**
     * @notice Calculates the amount that would rebase at next rebase.
     * This is before any fees.
     * @return yield amount of expected yield
     */
    function previewYield() external view returns (uint256 yield) {
        (yield, ) = _nextYield(oUSD.totalSupply(), _totalValue());
        return yield;
    }

    function _nextYield(uint256 supply, uint256 vaultValue)
        internal
        view
        virtual
        returns (uint256 yield, uint256 targetRate)
    {
        uint256 nonRebasing = oUSD.nonRebasingSupply();
        uint256 rebasing = supply - nonRebasing;
        uint256 elapsed = block.timestamp - lastRebase;
        targetRate = rebasePerSecondTarget;

        if (
            elapsed == 0 || // Yield only once per block.
            rebasing == 0 || // No yield if there are no rebasing tokens to give it to.
            supply > vaultValue || // No yield if we do not have yield to give.
            block.timestamp >= type(uint64).max // No yield if we are too far in the future to calculate it correctly.
        ) {
            return (0, targetRate);
        }

        // Start with the full difference available
        yield = vaultValue - supply;

        // Cap via optional automatic duration smoothing
        uint256 _dripDuration = dripDuration;
        if (_dripDuration > 1) {
            // If we are able to sustain an increased drip rate for
            // double the duration, then increase the target drip rate
            targetRate = _max(targetRate, yield / (_dripDuration * 2));
            // If we cannot sustain the target rate any more,
            // then rebase what we can, and reduce the target
            targetRate = _min(targetRate, yield / _dripDuration);
            // drip at the new target rate
            yield = _min(yield, targetRate * elapsed);
        }

        // Cap per second. elapsed is not 1e18 denominated
        yield = _min(yield, (rebasing * elapsed * rebasePerSecondMax) / 1e18);

        // Cap at a hard max per rebase, to avoid long durations resulting in huge rebases
        yield = _min(yield, (rebasing * MAX_REBASE) / 1e18);

        return (yield, targetRate);
    }

    /**
     * @notice Determine the total value of assets held by the vault and its
     *         strategies.
     * @return value Total value in USD/ETH (1e18)
     */
    function totalValue() external view virtual returns (uint256 value) {
        value = _totalValue();
    }

    /**
     * @dev Internal Calculate the total value of the assets held by the
     *         vault and its strategies.
     * @return value Total value in USD/ETH (1e18)
     */
    function _totalValue() internal view virtual returns (uint256 value) {
        return _totalValueInVault() + _totalValueInStrategies();
    }

    /**
     * @dev Internal to calculate total value of all assets held in Vault.
     * @return value Total value in USD/ETH (1e18)
     */
    function _totalValueInVault()
        internal
        view
        virtual
        returns (uint256 value)
    {
        uint256 assetCount = allAssets.length;
        for (uint256 y; y < assetCount; ++y) {
            address assetAddr = allAssets[y];
            uint256 balance = IERC20(assetAddr).balanceOf(address(this));
            if (balance > 0) {
                value += _toUnits(balance, assetAddr);
            }
        }
    }

    /**
     * @dev Internal to calculate total value of all assets held in Strategies.
     * @return value Total value in USD/ETH (1e18)
     */
    function _totalValueInStrategies() internal view returns (uint256 value) {
        uint256 stratCount = allStrategies.length;
        for (uint256 i = 0; i < stratCount; ++i) {
            value = value + _totalValueInStrategy(allStrategies[i]);
        }
    }

    /**
     * @dev Internal to calculate total value of all assets held by strategy.
     * @param _strategyAddr Address of the strategy
     * @return value Total value in USD/ETH (1e18)
     */
    function _totalValueInStrategy(address _strategyAddr)
        internal
        view
        returns (uint256 value)
    {
        IStrategy strategy = IStrategy(_strategyAddr);
        uint256 assetCount = allAssets.length;
        for (uint256 y; y < assetCount; ++y) {
            address assetAddr = allAssets[y];
            if (strategy.supportsAsset(assetAddr)) {
                uint256 balance = strategy.checkBalance(assetAddr);
                if (balance > 0) {
                    value += _toUnits(balance, assetAddr);
                }
            }
        }
    }

    /**
     * @notice Get the balance of an asset held in Vault and all strategies.
     * @param _asset Address of asset
     * @return uint256 Balance of asset in decimals of asset
     */
    function checkBalance(address _asset) external view returns (uint256) {
        return _checkBalance(_asset);
    }

    /**
     * @notice Get the balance of an asset held in Vault and all strategies.
     * @param _asset Address of asset
     * @return balance Balance of asset in decimals of asset
     */
    function _checkBalance(address _asset)
        internal
        view
        virtual
        returns (uint256 balance)
    {
        IERC20 asset = IERC20(_asset);
        balance = asset.balanceOf(address(this));
        uint256 stratCount = allStrategies.length;
        for (uint256 i = 0; i < stratCount; ++i) {
            IStrategy strategy = IStrategy(allStrategies[i]);
            if (strategy.supportsAsset(_asset)) {
                balance = balance + strategy.checkBalance(_asset);
            }
        }
    }

    /**
     * @notice Calculate the outputs for a redeem function, i.e. the mix of
     * coins that will be returned
     */
    function calculateRedeemOutputs(uint256 _amount)
        external
        view
        returns (uint256[] memory)
    {
        return _calculateRedeemOutputs(_amount);
    }

    /**
     * @dev Calculate the outputs for a redeem function, i.e. the mix of
     * coins that will be returned.
     * @return outputs Array of amounts respective to the supported assets
     */
    function _calculateRedeemOutputs(uint256 _amount)
        internal
        view
        virtual
        returns (uint256[] memory outputs)
    {
        // We always give out coins in proportion to how many we have,
        // Now if all coins were the same value, this math would easy,
        // just take the percentage of each coin, and multiply by the
        // value to be given out. But if coins are worth more than $1,
        // then we would end up handing out too many coins. We need to
        // adjust by the total value of coins.
        //
        // To do this, we total up the value of our coins, by their
        // percentages. Then divide what we would otherwise give out by
        // this number.
        //
        // Let say we have 100 DAI at $1.06  and 200 USDT at $1.00.
        // So for every 1 DAI we give out, we'll be handing out 2 USDT
        // Our total output ratio is: 33% * 1.06 + 66% * 1.00 = 1.02
        //
        // So when calculating the output, we take the percentage of
        // each coin, times the desired output value, divided by the
        // totalOutputRatio.
        //
        // For example, withdrawing: 30 OUSD:
        // DAI 33% * 30 / 1.02 = 9.80 DAI
        // USDT = 66 % * 30 / 1.02 = 19.60 USDT
        //
        // Checking these numbers:
        // 9.80 DAI * 1.06 = $10.40
        // 19.60 USDT * 1.00 = $19.60
        //
        // And so the user gets $10.40 + $19.60 = $30 worth of value.

        uint256 assetCount = allAssets.length;
        uint256[] memory assetUnits = new uint256[](assetCount);
        uint256[] memory assetBalances = new uint256[](assetCount);
        outputs = new uint256[](assetCount);

        // Calculate redeem fee
        if (redeemFeeBps > 0) {
            uint256 redeemFee = _amount.mulTruncateScale(redeemFeeBps, 1e4);
            _amount = _amount - redeemFee;
        }

        // Calculate assets balances and decimals once,
        // for a large gas savings.
        uint256 totalUnits = 0;
        for (uint256 i = 0; i < assetCount; ++i) {
            address assetAddr = allAssets[i];
            uint256 balance = _checkBalance(assetAddr);
            assetBalances[i] = balance;
            assetUnits[i] = _toUnits(balance, assetAddr);
            totalUnits = totalUnits + assetUnits[i];
        }
        // Calculate totalOutputRatio
        uint256 totalOutputRatio = 0;
        for (uint256 i = 0; i < assetCount; ++i) {
            uint256 unitPrice = _toUnitPrice(allAssets[i], false);
            uint256 ratio = (assetUnits[i] * unitPrice) / totalUnits;
            totalOutputRatio = totalOutputRatio + ratio;
        }
        // Calculate final outputs
        uint256 factor = _amount.divPrecisely(totalOutputRatio);
        for (uint256 i = 0; i < assetCount; ++i) {
            outputs[i] = (assetBalances[i] * factor) / totalUnits;
        }
    }

    /***************************************
                    Pricing
    ****************************************/

    /**
     * @notice Returns the total price in 18 digit units for a given asset.
     *      Never goes above 1, since that is how we price mints.
     * @param asset address of the asset
     * @return price uint256: unit (USD / ETH) price for 1 unit of the asset, in 18 decimal fixed
     */
    function priceUnitMint(address asset)
        external
        view
        returns (uint256 price)
    {
        /* need to supply 1 asset unit in asset's decimals and can not just hard-code
         * to 1e18 and ignore calling `_toUnits` since we need to consider assets
         * with the exchange rate
         */
        uint256 units = _toUnits(
            uint256(1e18).scaleBy(_getDecimals(asset), 18),
            asset
        );
        price = (_toUnitPrice(asset, true) * units) / 1e18;
    }

    /**
     * @notice Returns the total price in 18 digit unit for a given asset.
     *      Never goes below 1, since that is how we price redeems
     * @param asset Address of the asset
     * @return price uint256: unit (USD / ETH) price for 1 unit of the asset, in 18 decimal fixed
     */
    function priceUnitRedeem(address asset)
        external
        view
        returns (uint256 price)
    {
        /* need to supply 1 asset unit in asset's decimals and can not just hard-code
         * to 1e18 and ignore calling `_toUnits` since we need to consider assets
         * with the exchange rate
         */
        uint256 units = _toUnits(
            uint256(1e18).scaleBy(_getDecimals(asset), 18),
            asset
        );
        price = (_toUnitPrice(asset, false) * units) / 1e18;
    }

    /***************************************
                    Utils
    ****************************************/

    /**
     * @dev Convert a quantity of a token into 1e18 fixed decimal "units"
     * in the underlying base (USD/ETH) used by the vault.
     * Price is not taken into account, only quantity.
     *
     * Examples of this conversion:
     *
     * - 1e18 DAI becomes 1e18 units (same decimals)
     * - 1e6 USDC becomes 1e18 units (decimal conversion)
     * - 1e18 rETH becomes 1.2e18 units (exchange rate conversion)
     *
     * @param _raw Quantity of asset
     * @param _asset Core Asset address
     * @return value 1e18 normalized quantity of units
     */
    function _toUnits(uint256 _raw, address _asset)
        internal
        view
        returns (uint256)
    {
        UnitConversion conversion = assets[_asset].unitConversion;
        if (conversion == UnitConversion.DECIMALS) {
            return _raw.scaleBy(18, _getDecimals(_asset));
        } else if (conversion == UnitConversion.GETEXCHANGERATE) {
            uint256 exchangeRate = IGetExchangeRateToken(_asset)
                .getExchangeRate();
            return (_raw * exchangeRate) / 1e18;
        } else {
            revert("Unsupported conversion type");
        }
    }

    /**
     * @dev Returns asset's unit price accounting for different asset types
     *      and takes into account the context in which that price exists -
     *      - mint or redeem.
     *
     * Note: since we are returning the price of the unit and not the one of the
     * asset (see comment above how 1 rETH exchanges for 1.2 units) we need
     * to make the Oracle price adjustment as well since we are pricing the
     * units and not the assets.
     *
     * The price also snaps to a "full unit price" in case a mint or redeem
     * action would be unfavourable to the protocol.
     *
     */
    function _toUnitPrice(address _asset, bool isMint)
        internal
        view
        returns (uint256 price)
    {
        UnitConversion conversion = assets[_asset].unitConversion;
        price = IOracle(priceProvider).price(_asset);

        if (conversion == UnitConversion.GETEXCHANGERATE) {
            uint256 exchangeRate = IGetExchangeRateToken(_asset)
                .getExchangeRate();
            price = (price * 1e18) / exchangeRate;
        } else if (conversion != UnitConversion.DECIMALS) {
            revert("Unsupported conversion type");
        }

        /* At this stage the price is already adjusted to the unit
         * so the price checks are agnostic to underlying asset being
         * pegged to a USD or to an ETH or having a custom exchange rate.
         */
        require(price <= MAX_UNIT_PRICE_DRIFT, "Vault: Price exceeds max");
        require(price >= MIN_UNIT_PRICE_DRIFT, "Vault: Price under min");

        if (isMint) {
            /* Never price a normalized unit price for more than one
             * unit of OETH/OUSD when minting.
             */
            if (price > 1e18) {
                price = 1e18;
            }
            require(price >= MINT_MINIMUM_UNIT_PRICE, "Asset price below peg");
        } else {
            /* Never give out more than 1 normalized unit amount of assets
             * for one unit of OETH/OUSD when redeeming.
             */
            if (price < 1e18) {
                price = 1e18;
            }
        }
    }

    /**
     * @dev Get the number of decimals of a token asset
     * @param _asset Address of the asset
     * @return decimals number of decimals
     */
    function _getDecimals(address _asset)
        internal
        view
        returns (uint256 decimals)
    {
        decimals = assets[_asset].decimals;
        require(decimals > 0, "Decimals not cached");
    }

    /**
     * @notice Return the number of assets supported by the Vault.
     */
    function getAssetCount() public view returns (uint256) {
        return allAssets.length;
    }

    /**
     * @notice Gets the vault configuration of a supported asset.
     * @param _asset Address of the token asset
     */
    function getAssetConfig(address _asset)
        public
        view
        returns (Asset memory config)
    {
        config = assets[_asset];
    }

    /**
     * @notice Return all vault asset addresses in order
     */
    function getAllAssets() external view returns (address[] memory) {
        return allAssets;
    }

    /**
     * @notice Return the number of strategies active on the Vault.
     */
    function getStrategyCount() external view returns (uint256) {
        return allStrategies.length;
    }

    /**
     * @notice Return the array of all strategies
     */
    function getAllStrategies() external view returns (address[] memory) {
        return allStrategies;
    }

    /**
     * @notice Returns whether the vault supports the asset
     * @param _asset address of the asset
     * @return true if supported
     */
    function isSupportedAsset(address _asset) external view returns (bool) {
        return assets[_asset].isSupported;
    }

    function ADMIN_IMPLEMENTATION() external view returns (address adminImpl) {
        bytes32 slot = adminImplPosition;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adminImpl := sload(slot)
        }
    }

    /**
     * @dev Falldown to the admin implementation
     * @notice This is a catch all for all functions not declared in core
     */
    // solhint-disable-next-line no-complex-fallback
    fallback() external {
        bytes32 slot = adminImplPosition;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(
                gas(),
                sload(slot),
                0,
                calldatasize(),
                0,
                0
            )

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    function abs(int256 x) private pure returns (uint256) {
        require(x < int256(MAX_INT), "Amount too high");
        return x >= 0 ? uint256(x) : uint256(-x);
    }

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

    function _max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title OToken VaultInitializer contract
 * @notice The Vault contract initializes the vault.
 * @author Origin Protocol Inc
 */

import "./VaultStorage.sol";

contract VaultInitializer is VaultStorage {
    function initialize(address _priceProvider, address _oToken)
        external
        onlyGovernor
        initializer
    {
        require(_priceProvider != address(0), "PriceProvider address is zero");
        require(_oToken != address(0), "oToken address is zero");

        oUSD = OUSD(_oToken);

        priceProvider = _priceProvider;

        rebasePaused = false;
        capitalPaused = true;

        // Initial redeem fee of 0 basis points
        redeemFeeBps = 0;
        // Initial Vault buffer of 0%
        vaultBuffer = 0;
        // Initial allocate threshold of 25,000 OUSD
        autoAllocateThreshold = 25000e18;
        // Threshold for rebasing
        rebaseThreshold = 1000e18;
        // Initialize all strategies
        allStrategies = new address[](0);
        // Start with drip duration disabled
        dripDuration = 1;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title OToken VaultStorage contract
 * @notice The VaultStorage contract defines the storage for the Vault contracts
 * @author Origin Protocol Inc
 */

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { Address } from "@openzeppelin/contracts/utils/Address.sol";

import { IStrategy } from "../interfaces/IStrategy.sol";
import { Governable } from "../governance/Governable.sol";
import { OUSD } from "../token/OUSD.sol";
import { Initializable } from "../utils/Initializable.sol";
import "../utils/Helpers.sol";

contract VaultStorage is Initializable, Governable {
    using SafeERC20 for IERC20;

    event AssetSupported(address _asset);
    event AssetRemoved(address _asset);
    event AssetDefaultStrategyUpdated(address _asset, address _strategy);
    event AssetAllocated(address _asset, address _strategy, uint256 _amount);
    event StrategyApproved(address _addr);
    event StrategyRemoved(address _addr);
    event Mint(address _addr, uint256 _value);
    event Redeem(address _addr, uint256 _value);
    event CapitalPaused();
    event CapitalUnpaused();
    event RebasePaused();
    event RebaseUnpaused();
    event VaultBufferUpdated(uint256 _vaultBuffer);
    event OusdMetaStrategyUpdated(address _ousdMetaStrategy);
    event RedeemFeeUpdated(uint256 _redeemFeeBps);
    event PriceProviderUpdated(address _priceProvider);
    event AllocateThresholdUpdated(uint256 _threshold);
    event RebaseThresholdUpdated(uint256 _threshold);
    event StrategistUpdated(address _address);
    event MaxSupplyDiffChanged(uint256 maxSupplyDiff);
    event YieldDistribution(address _to, uint256 _yield, uint256 _fee);
    event TrusteeFeeBpsChanged(uint256 _basis);
    event TrusteeAddressChanged(address _address);
    event NetOusdMintForStrategyThresholdChanged(uint256 _threshold);
    event SwapperChanged(address _address);
    event SwapAllowedUndervalueChanged(uint256 _basis);
    event SwapSlippageChanged(address _asset, uint256 _basis);
    event Swapped(
        address indexed _fromAsset,
        address indexed _toAsset,
        uint256 _fromAssetAmount,
        uint256 _toAssetAmount
    );
    event StrategyAddedToMintWhitelist(address indexed strategy);
    event StrategyRemovedFromMintWhitelist(address indexed strategy);
    event RebasePerSecondMaxChanged(uint256 rebaseRatePerSecond);
    event DripDurationChanged(uint256 dripDuration);
    event WithdrawalRequested(
        address indexed _withdrawer,
        uint256 indexed _requestId,
        uint256 _amount,
        uint256 _queued
    );
    event WithdrawalClaimed(
        address indexed _withdrawer,
        uint256 indexed _requestId,
        uint256 _amount
    );
    event WithdrawalClaimable(uint256 _claimable, uint256 _newClaimable);
    event WithdrawalClaimDelayUpdated(uint256 _newDelay);

    // Since we are proxy, all state should be uninitalized.
    // Since this storage contract does not have logic directly on it
    // we should not be checking for to see if these variables can be constant.
    // slither-disable-start uninitialized-state
    // slither-disable-start constable-states

    // Assets supported by the Vault, i.e. Stablecoins
    enum UnitConversion {
        DECIMALS,
        GETEXCHANGERATE
    }
    // Changed to fit into a single storage slot so the decimals needs to be recached
    struct Asset {
        // Note: OETHVaultCore doesn't use `isSupported` when minting,
        // redeeming or checking balance of assets.
        bool isSupported;
        UnitConversion unitConversion;
        uint8 decimals;
        // Max allowed slippage from the Oracle price when swapping collateral assets in basis points.
        // For example 40 == 0.4% slippage
        uint16 allowedOracleSlippageBps;
    }

    /// @dev mapping of supported vault assets to their configuration
    mapping(address => Asset) internal assets;
    /// @dev list of all assets supported by the vault.
    address[] internal allAssets;

    // Strategies approved for use by the Vault
    struct Strategy {
        bool isSupported;
        uint256 _deprecated; // Deprecated storage slot
    }
    /// @dev mapping of strategy contracts to their configuration
    mapping(address => Strategy) public strategies;
    /// @dev list of all vault strategies
    address[] internal allStrategies;

    /// @notice Address of the Oracle price provider contract
    address public priceProvider;
    /// @notice pause rebasing if true
    bool public rebasePaused;
    /// @notice pause operations that change the OToken supply.
    /// eg mint, redeem, allocate, mint/burn for strategy
    bool public capitalPaused;
    /// @notice Redemption fee in basis points. eg 50 = 0.5%
    uint256 public redeemFeeBps;
    /// @notice Percentage of assets to keep in Vault to handle (most) withdrawals. 100% = 1e18.
    uint256 public vaultBuffer;
    /// @notice OToken mints over this amount automatically allocate funds. 18 decimals.
    uint256 public autoAllocateThreshold;
    /// @notice OToken mints over this amount automatically rebase. 18 decimals.
    uint256 public rebaseThreshold;

    /// @dev Address of the OToken token. eg OUSD or OETH.
    OUSD public oUSD;

    /// @dev Storage slot for the address of the VaultAdmin contract that is delegated to
    // keccak256("OUSD.vault.governor.admin.impl");
    bytes32 public constant adminImplPosition =
        0xa2bd3d3cf188a41358c8b401076eb59066b09dec5775650c0de4c55187d17bd9;

    /// @dev Address of the contract responsible for post rebase syncs with AMMs
    address private _deprecated_rebaseHooksAddr = address(0);

    /// @dev Deprecated: Address of Uniswap
    address private _deprecated_uniswapAddr = address(0);

    /// @notice Address of the Strategist
    address public strategistAddr = address(0);

    /// @notice Mapping of asset address to the Strategy that they should automatically
    // be allocated to
    mapping(address => address) public assetDefaultStrategies;

    /// @notice Max difference between total supply and total value of assets. 18 decimals.
    uint256 public maxSupplyDiff;

    /// @notice Trustee contract that can collect a percentage of yield
    address public trusteeAddress;

    /// @notice Amount of yield collected in basis points. eg 2000 = 20%
    uint256 public trusteeFeeBps;

    /// @dev Deprecated: Tokens that should be swapped for stablecoins
    address[] private _deprecated_swapTokens;

    uint256 constant MINT_MINIMUM_UNIT_PRICE = 0.998e18;

    /// @notice Metapool strategy that is allowed to mint/burn OTokens without changing collateral

    address public ousdMetaStrategy;

    /// @notice How much OTokens are currently minted by the strategy
    int256 public netOusdMintedForStrategy;

    /// @notice How much net total OTokens are allowed to be minted by all strategies
    uint256 public netOusdMintForStrategyThreshold;

    uint256 constant MIN_UNIT_PRICE_DRIFT = 0.7e18;
    uint256 constant MAX_UNIT_PRICE_DRIFT = 1.3e18;

    /// @notice Collateral swap configuration.
    /// @dev is packed into a single storage slot to save gas.
    struct SwapConfig {
        // Contract that swaps the vault's collateral assets
        address swapper;
        // Max allowed percentage the total value can drop below the total supply in basis points.
        // For example 100 == 1%
        uint16 allowedUndervalueBps;
    }
    SwapConfig internal swapConfig = SwapConfig(address(0), 0);

    // List of strategies that can mint oTokens directly
    // Used in OETHBaseVaultCore
    mapping(address => bool) public isMintWhitelistedStrategy;

    /// @notice Address of the Dripper contract that streams harvested rewards to the Vault
    /// @dev The vault is proxied so needs to be set with setDripper against the proxy contract.
    address private _deprecated_dripper;

    /// Withdrawal Queue Storage /////

    struct WithdrawalQueueMetadata {
        // cumulative total of all withdrawal requests included the ones that have already been claimed
        uint128 queued;
        // cumulative total of all the requests that can be claimed including the ones that have already been claimed
        uint128 claimable;
        // total of all the requests that have been claimed
        uint128 claimed;
        // index of the next withdrawal request starting at 0
        uint128 nextWithdrawalIndex;
    }

    /// @notice Global metadata for the withdrawal queue including:
    /// queued - cumulative total of all withdrawal requests included the ones that have already been claimed
    /// claimable - cumulative total of all the requests that can be claimed including the ones already claimed
    /// claimed - total of all the requests that have been claimed
    /// nextWithdrawalIndex - index of the next withdrawal request starting at 0
    WithdrawalQueueMetadata public withdrawalQueueMetadata;

    struct WithdrawalRequest {
        address withdrawer;
        bool claimed;
        uint40 timestamp; // timestamp of the withdrawal request
        // Amount of oTokens to redeem. eg OETH
        uint128 amount;
        // cumulative total of all withdrawal requests including this one.
        // this request can be claimed when this queued amount is less than or equal to the queue's claimable amount.
        uint128 queued;
    }

    /// @notice Mapping of withdrawal request indices to the user withdrawal request data
    mapping(uint256 => WithdrawalRequest) public withdrawalRequests;

    /// @notice Sets a minimum delay that is required to elapse between
    ///     requesting async withdrawals and claiming the request.
    ///     When set to 0 async withdrawals are disabled.
    uint256 public withdrawalClaimDelay;

    /// @notice Time in seconds that the vault last rebased yield.
    uint64 public lastRebase;

    /// @notice Automatic rebase yield calculations. In seconds. Set to 0 or 1 to disable.
    uint64 public dripDuration;

    /// @notice max rebase percentage per second
    ///   Can be used to set maximum yield of the protocol,
    ///   spreading out yield over time
    uint64 public rebasePerSecondMax;

    /// @notice target rebase rate limit, based on past rates and funds available.
    uint64 public rebasePerSecondTarget;

    uint256 internal constant MAX_REBASE = 0.02 ether;
    uint256 internal constant MAX_REBASE_PER_SECOND =
        uint256(0.05 ether) / 1 days;

    // For future use
    uint256[43] private __gap;

    // slither-disable-end constable-states
    // slither-disable-end uninitialized-state

    /**
     * @notice set the implementation for the admin, this needs to be in a base class else we cannot set it
     * @param newImpl address of the implementation
     */
    function setAdminImpl(address newImpl) external onlyGovernor {
        require(
            Address.isContract(newImpl),
            "new implementation is not a contract"
        );
        bytes32 position = adminImplPosition;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(position, newImpl)
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000039e2fb66102314ce7b64ce5ce3e5183bc94ad38

-----Decoded View---------------
Arg [0] : _wS (address): 0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000039e2fb66102314ce7b64ce5ce3e5183bc94ad38