// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

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

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

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

  function version() external view returns (uint256);

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

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

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IConfigurator {
    struct OriginationFeeConfig {
        uint16 minOriginationFee; // fee at 0% utilization
        uint16 maxOriginationFee; // fee at 100% utilization
    }

    struct RedemptionConfig {
        bool enabled; //whether a vault can redeem
        uint16 baseFee; // base fee for redemption
        uint16 maxMultiplier; // fee for redemption
        uint16 maxCollateralRatio; // collateral ratio for max fee multiplier
        uint16 providerShare; // share of redemption fee that goes to provider
    }

    function zkOracleAddress(address vault) external view returns(address);
    function vaultEnabled(address vault) external view returns(bool);
    function vaultMintPaused(address vault) external view returns(bool);
    function vaultBurnPaused(address vault) external view returns(bool);
    function mintVaultMaxSupply(address vault) external view returns(uint256);
    function getBadCollateralRatio(address vault) external view returns(uint256);
    function getSafeCollateralRatio(address vault) external view returns(uint256);
    function borrowApr(address vault) external view returns(uint256);
    function getKeeperReward(address vault) external view returns(uint256);
    function getOriginationFee(address vault) external view returns(uint256, uint256);
    function getRedemptionFee(address vault, uint256 collateralRatio) external view returns(uint256, uint256);
    function getRedemptionConfig(address vault) external view returns(RedemptionConfig memory);
    function getDepegThreshold(address vault) external view returns(uint256);
    function useMarketRate(address vault) external view returns(bool);

    function treasury() external view returns(address);
    function flashloanFee() external view returns(uint256);
    function owner() external view returns (address);
    function admin() external view returns(address);
    function nUSD() external view returns(address);
    function etherOracle() external view returns(address);
    function getAllVaults() external view returns(address[] memory);
    function getAllCollaterals() external view returns(address[] memory);
    function isRewardManager(address user) external view returns(bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IZkOracle {
    //@notice returns the address of the asset
    function assetAddress() external view returns (address);
    //@notice returns the market rate of the collateral in terms of underlying
    function getMarketRate() external view returns (uint256);
    //@notice returns the backing or redemption rate of the collateral in terms of underlying
    function getRedemptionRate() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface InUSD {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function mint(
        address to,
        uint256 amount
    ) external returns (bool);
    function burn(
        address account,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.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;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    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");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "contracts/unstable/interfaces/InUSD.sol";
import "contracts/unstable/interfaces/IConfigurator.sol";
import "contracts/unstable/interfaces/IZkOracle.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract StakedEthVault is ReentrancyGuard {
    using SafeERC20 for IERC20;

    InUSD public immutable nUSD;
    IERC20 public immutable collateralAsset;
    IConfigurator public immutable configurator;

    uint256 public poolTotalCirculation;

    // Maybe using struct packing would save some gas on critical functions
    mapping(address => uint256) public depositedAsset;
    mapping(address => uint256) public borrowed;
    mapping(address => uint256) public feeStored;
    mapping(address => uint256) public feeUpdatedAt;

    event DepositEther(address indexed onBehalfOf, address asset, uint256 etherAmount, uint256 assetAmount, uint256 timestamp);

    event DepositAsset(address indexed onBehalfOf, address asset, uint256 amount, uint256 timestamp);
    event WithdrawAsset(address indexed sponsor, address asset, address indexed onBehalfOf, uint256 amount, uint256 timestamp);
    event Mint(address indexed sponsor, address indexed onBehalfOf, uint256 amount, uint256 originationFee, uint256 timestamp);
    event Burn(address indexed sponsor, address indexed onBehalfOf, uint256 amount, uint256 timestamp);
    event LiquidationRecord(address indexed provider, address indexed keeper, address indexed debtor, uint256 nusdAmount, uint256 LiquidateAssetAmount, uint256 keeperReward, bool superLiquidation);
    event Redemption(address indexed caller, address indexed debtor, uint256 nusdToProtocol, uint256 nusdToRepay, uint256 collateralReceived);

    // MultiRewards farming functionality
    struct Reward {
        uint256 rewardsDuration;
        uint256 periodFinish;
        uint256 rewardRate;
        uint256 lastUpdateTime;
        uint256 rewardPerTokenStored;
    }

    mapping(address => Reward) public rewardData;
    address[] public rewardTokens;

    mapping(address => mapping(address => uint256)) public userRewardPerTokenPaid;
    mapping(address => mapping(address => uint256)) public rewards;

    event RewardAdded(uint256 reward);
    event RewardPaid(address indexed user, address indexed rewardsToken, uint256 reward);
    event RewardsDurationUpdated(address token, uint256 newDuration);
    event Recovered(address token, uint256 amount);

    //constructor
    constructor(address _collateral, address _configurator) {
        collateralAsset = IERC20(_collateral);
        configurator = IConfigurator(_configurator);
        nUSD = InUSD(configurator.nUSD());
    }

    function totalDepositedAsset() public view virtual returns (uint256) {
        return collateralAsset.balanceOf(address(this));
    }

    /**
     * @notice Deposit staked ETH, update the interest distribution, can mint nUSD directly
     * Emits a `DepositAsset` event.
     *
     * Requirements:
     * - `assetAmount` Must be higher than 0.
     * - `mintAmount` Send 0 if deposit only, no mint of nUSD
     */
    function depositAssetToMint(uint256 assetAmount, uint256 mintAmount) external updateReward(msg.sender) nonReentrant virtual {
        require(assetAmount > 0, "Deposit should be > 0");
        collateralAsset.safeTransferFrom(msg.sender, address(this), assetAmount);

        depositedAsset[msg.sender] += assetAmount;
        if (mintAmount > 0) {
            _mintnUSD(msg.sender, msg.sender, mintAmount);
        }
        emit DepositAsset(msg.sender, address(collateralAsset), assetAmount, block.timestamp);
    }

    /**
     * @notice Withdraw collateral assets to an address
     * Emits a `WithdrawAsset` event.
     *
     * Requirements:
     * - `onBehalfOf` cannot be the zero address.
     * - `amount` Must be higher than 0.
     *
     * @dev Withdraw collateral. Check user’s collateral ratio after withdrawal, should be higher than `safeCollateralRatio`
     */
    function withdraw(address onBehalfOf, uint256 amount) external updateReward(msg.sender) nonReentrant virtual {
        require(onBehalfOf != address(0), "to zero address");
        require(amount != 0, "zero amount");
        _withdraw(msg.sender, onBehalfOf, amount);
    }

    /**
     * @notice The mint amount number of nUSD is minted to the address
     * Emits a `Mint` event.
     *
     * Requirements:
     * - `onBehalfOf` cannot be the zero address.
     */
    function mint(address onBehalfOf, uint256 amount) external nonReentrant virtual {
        require(onBehalfOf != address(0), "to zero address");
        require(amount != 0, "zero amount");
        _mintnUSD(msg.sender, onBehalfOf, amount);
    }

    /**
     * @notice Burn the amount of nUSD and payback the amount of minted nUSD
     * Emits a `Burn` event.
     * Requirements:
     * - `onBehalfOf` cannot be the zero address.
     * - `amount` Must be higher than 0.
     * @dev Calling the internal`_repay`function.
     */
    function burn(address onBehalfOf, uint256 amount) external nonReentrant virtual {
        require(onBehalfOf != address(0), "to zero address");
        require(amount != 0, "zero amount");
        _repay(msg.sender, onBehalfOf, amount);
    }

    /**
     * @notice Keeper liquidates borrowers whose collateral ratio is below badCollateralRatio, using nUSD provided by Liquidation Provider.
     *
     * Requirements:
     * - onBehalfOf Collateral Ratio should be below badCollateralRatio
     * - assetAmount should be less than 50% of collateral - If liquidating 50% of the collateral doesn't bring the position to health, you should allow a full liquidation.
     * - provider should authorize Unstable to utilize nUSD
     * @dev After liquidation, borrower's debt is reduced by assetAmount * assetPrice, providers and keepers can receive up to an additional 10% liquidation reward.
     */
    //TODO: logic for full liquidation in case 50% doesn't bring to health
    function liquidation(address provider, address debtor, uint256 assetAmount) external updateReward(debtor) nonReentrant virtual {
        uint256 assetPrice = getAssetPrice();
        uint256 debtorCollateralRatio = getCollateralRatio(debtor);
        require(debtorCollateralRatio < configurator.getBadCollateralRatio(address(this)), "Borrowers collateral ratio should below badCollateralRatio");
        require(assetAmount * 2 <= depositedAsset[debtor], "a max of 50% collateral can be liquidated");
        require(nUSD.allowance(provider, address(this)) != 0 || msg.sender == provider, "provider should authorize to provide liquidation nUSD");
        uint256 nusdAmount = assetAmount * assetPrice / 1e18;

        _repay(provider, debtor, nusdAmount);
        uint256 reducedAsset = assetAmount;
        //If collateralRatio is 100-110%, liquidator bonus is less than 10%
        if(debtorCollateralRatio > 100_00 && debtorCollateralRatio < 110_00) {
            reducedAsset = assetAmount * debtorCollateralRatio / 100_00;
        }
        //If collateralRatio is more than 110%, 10% liquidation bonus
        if(debtorCollateralRatio >= 110_00) {
            reducedAsset = assetAmount * 11 / 10; //10% bonus
        }
        depositedAsset[debtor] -= reducedAsset;
        uint256 rewardToKeeper;
        //Send keeper reward <- Which is taken from the liquidator payment.
        uint256 keeperReward = configurator.getKeeperReward(address(this));
        if (msg.sender != provider && debtorCollateralRatio >= 100_00 + keeperReward) {
            rewardToKeeper = assetAmount * keeperReward / 100_00;
            collateralAsset.safeTransfer(msg.sender, rewardToKeeper);
        }
        collateralAsset.safeTransfer(provider, reducedAsset - rewardToKeeper);
        emit LiquidationRecord(provider, msg.sender, debtor, nusdAmount, reducedAsset, rewardToKeeper, false);
    }

    /**
     * @notice Choose a Redemption Provider, redeem `nusdAmount` of nUSD and get 1:1 value of collateral minus fees
     * Emits a `Redemption` event.
     *
     * *Requirements:
     * - `debtor`debt must equal to or above`nusdAmount`
     * - `debtor` must be eligible, use `calculateRedemption` to check
     */
    function redemption(address debtor, uint256 nusdAmount, uint256 minReceiveAmount) external updateReward(debtor) nonReentrant virtual {
        require(debtor != msg.sender, "no self redeem"); //TODO: is this necessary?
        (, , uint256 nusdToProtocol, uint256 nusdToRepay, , uint256 collateralReceived) = calculateRedemption(debtor, nusdAmount);
        require(collateralReceived >= minReceiveAmount, "Collateral amount is less than minReceiveAmount");
        if(nusdToProtocol > 0) {
            nUSD.transferFrom(msg.sender, address(configurator), nusdToProtocol);
        }
        _repay(msg.sender, debtor, nusdToRepay);
        depositedAsset[debtor] -= collateralReceived;
        collateralAsset.safeTransfer(msg.sender, collateralReceived);
        emit Redemption(msg.sender, debtor, nusdToProtocol, nusdToRepay, collateralReceived);
    }

    /**
     * @notice Calculate redemption for a provider and nusdAmount
     */
    function calculateRedemption(address debtor, uint256 nusdAmount) public view returns
    (uint256 providerFee, uint256 protocolFee, uint256 nusdToProtocol, uint256 nusdToRepay, uint256 nusdToConvert, uint256 collateralReceived) {
        // providerFee, protocolFee and nusdToConvert are never used.
        require(nusdAmount > 0, "redemption should be > 0");
        require(getBorrowedOf(debtor) >= nusdAmount, "nusdAmount cannot surpass providers debt");
        uint256 assetPrice = getAssetPrice();
        uint256 providerCollateralRatio = (depositedAsset[debtor] * assetPrice * 10_000) / getBorrowedOf(debtor) / 1e18;
        (providerFee, protocolFee) = configurator.getRedemptionFee(address(this), providerCollateralRatio);
        nusdToProtocol = nusdAmount * protocolFee / 10_000;
        nusdToRepay = nusdAmount - nusdToProtocol;
        nusdToConvert = nusdToRepay * (10_000 - providerFee) / 10_000;
        collateralReceived = nusdToConvert * 1e18 / assetPrice;
    }

    /**
     * @notice Get the maximum amount of nUSD that can be redeemed from a specified provider
     */
    function getRedeemableAmount(address provider) public view returns(uint256) {
        IConfigurator.RedemptionConfig memory config = configurator.getRedemptionConfig(address(this));
        if(!config.enabled) return 0;
        if(getBorrowedOf(provider) == 0) return 0;
        if(getCollateralRatio(provider) > config.maxCollateralRatio || getCollateralRatio(provider) < 10_000) return 0;
        return getBorrowedOf(provider);
    }

    /**
     * @dev Refresh accrued interest fee before adding totalSupply. Check providers collateralRatio cannot below `safeCollateralRatio`after minting. Collect origination fee.
     */
    function _mintnUSD(address _provider, address _onBehalfOf, uint256 _mintAmount) internal virtual {
        require(!isDepegged(), "Collateral is depegged, minting paused");
        require(poolTotalCirculation + _mintAmount <= configurator.mintVaultMaxSupply(address(this)), "exceeds cap");
        _updateFee(_provider);

        borrowed[_provider] += _mintAmount;
        uint256 originationFee = getOriginationFee(_mintAmount);
        nUSD.mint(address(configurator), originationFee);
        nUSD.mint(_onBehalfOf, _mintAmount - originationFee);
        poolTotalCirculation += _mintAmount;
        require(_checkHealth(_provider), "user is unhealthy after mint");
        emit Mint(_provider, _onBehalfOf, _mintAmount, originationFee, block.timestamp);
    }

    /**
     * @dev Calculate origination fee based on pool utilization.
     */
    function getOriginationFee(uint256 _mintAmount) public view returns(uint256) {
        (uint256 minOriginationFee, uint256 maxOriginationFee) = configurator.getOriginationFee(address(this));
        uint256 poolUtilization = (poolTotalCirculation + _mintAmount) * 1e18 / configurator.mintVaultMaxSupply(address(this));
        return (maxOriginationFee - minOriginationFee) * poolUtilization * _mintAmount / 1e18 / 10000;
    }

    /**
     * @notice Burn _provideramount nUSD to payback minted nUSD for _onBehalfOf.
     * @dev Refresh accrued interest fee before reducing nUSDCirculation.
     */
    function _repay(address _provider, address _onBehalfOf, uint256 _amount) internal virtual {
        // _amount can be more than the amount owed, and the excess will be ignored.
        _updateFee(_onBehalfOf);
        uint256 _feeStored = feeStored[_onBehalfOf];
        uint256 _toRepay = _min(borrowed[_onBehalfOf] + _feeStored, _amount);

        if(_toRepay > _feeStored) {
            if(_feeStored > 0) {
                nUSD.transferFrom(_provider, address(configurator), _feeStored);
                feeStored[_onBehalfOf] = 0;
            }
            // First we repay the fees, then principal with the rest
            nUSD.burn(_provider, _toRepay - _feeStored);
            borrowed[_onBehalfOf] -= _toRepay - _feeStored;
            poolTotalCirculation -= _toRepay - _feeStored;
        } else {
            // The user provided an amount to repay below the fees owed, so we only repay fees and no principal.
            nUSD.transferFrom(_provider, address(configurator), _toRepay);
            feeStored[_onBehalfOf] = _feeStored - _toRepay;
        }
        emit Burn(_provider, _onBehalfOf, _toRepay, block.timestamp);
    }

    function _withdraw(address _provider, address _onBehalfOf, uint256 _amount) internal virtual {
        require(depositedAsset[_provider] >= _amount, "Withdraw amount exceeds deposited amount.");
        depositedAsset[_provider] -= _amount;
        collateralAsset.safeTransfer(_onBehalfOf, _amount);
        if (getBorrowedOf(_provider) > 0) {
            require(_checkHealth(_provider), "User is unhealthy after withdraw");
        }
        emit WithdrawAsset(_provider, address(collateralAsset), _onBehalfOf, _amount, block.timestamp);
    }

    /**
     * @param user The address of the user.
     * @dev Get USD value of current collateral asset and minted nUSD through price oracle / Collateral asset USD value must higher than safe Collateral Ratio.
     * @return true if the user is healthy, false otherwise.
     */
    function _checkHealth(address user) internal view returns(bool) {
        uint256 price = getAssetPrice();
        if ((depositedAsset[user] * price * 10_000) < (getBorrowedOf(user) * configurator.getSafeCollateralRatio(address(this)) * 1e18 / 10_000)) {
            return false;
        } else {
            return true;
        }
    }

    function _updateFee(address user) internal {
        if (block.timestamp > feeUpdatedAt[user]) {
            feeStored[user] += _newFee(user);
            feeUpdatedAt[user] = block.timestamp;
        }
    }

    function _newFee(address user) internal view returns (uint256) {
        uint256 secondsInYear = 86_400 * 365;
        uint256 secondsSinceLastFee = block.timestamp - feeUpdatedAt[user];
        return borrowed[user] * configurator.borrowApr(address(this)) * secondsSinceLastFee / secondsInYear / 10_000;
    }

    /**
    * @dev Return configured oracle address
    */
    function getZkOracle() public view returns (address) {
        return configurator.zkOracleAddress(address(collateralAsset));
    }

    /**
     * @dev Return rate of collateral asset in ETH terms through zkOracle.
     */
    function getMarketRate() public view returns (uint256) {
        IZkOracle zkOracle = IZkOracle(getZkOracle());
        return zkOracle.getMarketRate();
    }

    /**
     * @dev Return redemption rate of collateral asset in ETH terms through zkOracle.
     */
    function getRedemptionRate() public view returns (uint256) {
        IZkOracle zkOracle = IZkOracle(getZkOracle());
        return zkOracle.getRedemptionRate();
    }

    /**
     * @dev Return value of collateral asset in underlying terms through zkOracle.
     * @notice This will have a market rate and also redemption rate
     */
    function getAssetToUnderlyingRate() public view returns (uint256) {
        uint256 redemptionRate = getRedemptionRate();

        if(configurator.useMarketRate(address(this))) {
            uint256 marketRate = getMarketRate();
            if(marketRate == 0) {
                return redemptionRate; //In case market price oracle is broken, default to redemptionRate
            } else { // If chainlink prices flash crash below minAnswer, you will get stale prices. I'm not sure you can do much about that.
                return _min(marketRate, redemptionRate); //even if marketRate is toggled, don't allow over-peg valuation
            }
        } else {
            return redemptionRate;
        }
    }

    /**
     * @dev Check if the collateral asset is depegged according to threshold set in configurator
     */
    function isDepegged() public view returns (bool) {
        uint256 marketRate = getMarketRate();
        if(marketRate == 0) {
            return false; //if market rate oracle is zero, presume market rate is not configured and take no action
        }
        uint256 redemptionRate = getRedemptionRate();
        uint256 minMarketRate = redemptionRate * (10_000 - configurator.getDepegThreshold(address(this))) / 10_000;
        return marketRate < minMarketRate;
    }

    /**
     * @dev Return value of underlying asset in USD terms.
     * @notice This *should* only be market rate, returns chainlink ETH price as default
     */
    function getUnderlyingToUsdPrice() public view returns (uint256) {
        (,int price, , , ) = AggregatorV3Interface(configurator.etherOracle()).latestRoundData();
        return uint256(price) * 1e10;
    }

    /**
     * @dev Get USD value of collateral asset
     */
    function getAssetPrice() public view returns (uint256) {
        return getAssetToUnderlyingRate() * getUnderlyingToUsdPrice() / 1e18;
    }

    /**
     * @dev Returns the current borrowing amount for the user, including borrowed shares and accumulated fees.
     * @param user The address of the user.
     * @return The total borrowing amount for the user.
     */
    function getBorrowedOf(address user) public view returns (uint256) {
        return borrowed[user] + feeStored[user] + _newFee(user);
    }

    function getPoolTotalCirculation() public view returns (uint256) {
        return poolTotalCirculation;
    }

    function getAsset() external view returns (address) {
        return address(collateralAsset);
    }

    //View functions - frontend friendly
    function getCollateralRatio(address user) public view returns (uint256) {
        if (getBorrowedOf(user) == 0) return 10_000 * 1e18; //really big number
        return (depositedAsset[user] * getAssetPrice() * 10_000) / getBorrowedOf(user) / 1e18;
    }

    function isHealthy(address user) external view returns(bool) {
        return _checkHealth(user);
    }

    function getOverallCollateralRatio() public view returns (uint256) {
        return (totalDepositedAsset() * getAssetPrice() * 10_000) / poolTotalCirculation / 1e18;
    }

    function getLiquidateableAmount(address user) public view returns (uint256 collateralAmount, uint256 nUsdAmount) {
        if (getCollateralRatio(user) > configurator.getSafeCollateralRatio(address(this))) return (0, 0);
        collateralAmount = depositedAsset[user] / 2;
        nUsdAmount = collateralAmount * getAssetPrice() / 1e18;
    }

    function getLiquidateFund(address user) public view returns (uint256 nusdAmount) {
        InUSD token = InUSD(configurator.nUSD());
        uint256 approval = token.allowance(user, address(this));
        if (approval == 0) return 0;
        uint256 bal = token.balanceOf(user);
        nusdAmount = approval > bal ? bal : approval; // You have a _min function
    }

    function getWithdrawableAmount(address user) public view returns (uint256) {
        if (getBorrowedOf(user) == 0)
            return depositedAsset[user];
        uint256 safeCollateralRatio = configurator.getSafeCollateralRatio(address(this));
        if (getCollateralRatio(user) <= safeCollateralRatio) return 0;
        return depositedAsset[user] * (getCollateralRatio(user) - safeCollateralRatio) / getCollateralRatio(user);
    }

    function roomToCap() public view returns (uint256) {
        if(poolTotalCirculation >= configurator.mintVaultMaxSupply(address(this))) return 0; //deal with case where it's above cap
        return configurator.mintVaultMaxSupply(address(this)) - poolTotalCirculation;
    }

    function getMaxMintableAmountWithDeposit(address user, uint256 deposit) public view returns (uint256 nusdAmount) {
        uint256 newDepositedAmount = depositedAsset[user] + deposit;
        uint256 safeCollateralRatio = configurator.getSafeCollateralRatio(address(this));
        uint256 userBorrow = getBorrowedOf(user);
        uint256 cap = configurator.mintVaultMaxSupply(address(this));
        uint256 maxBorrowAtSafeRatio = newDepositedAmount * getAssetPrice() * 10_000 / safeCollateralRatio / 1e18;
        uint256 effectiveMax = _min(maxBorrowAtSafeRatio, cap);

        if(userBorrow >= effectiveMax) {
            return 0; //if user has already borrowed more than the max, then no mintable amount
        } else {
            uint256 mintMax = effectiveMax - userBorrow;
            return mintMax - getOriginationFee(mintMax);
        }
    }

    function getTVL() public view returns (uint256) {
        return totalDepositedAsset() * getAssetPrice() / 1e18;
    }

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

    //MultiRewards farming functionality
    //Modified from https://github.com/curvefi/multi-rewards
    //staked asset is replaced with deposited collateral (depositedOf[user])
    //access control is managed via rewardManager as specified in configurator

    //views for multirewards
    function lastTimeRewardApplicable(address _rewardsToken) public view returns (uint256) {
        return _min(block.timestamp, rewardData[_rewardsToken].periodFinish);
    }

    //total balance of collateral asset
    function _totalSupply() internal view returns(uint256) {
        return totalDepositedAsset();
    }

    function rewardPerToken(address _rewardsToken) public view returns (uint256) {
        if (_totalSupply() == 0) {
            return rewardData[_rewardsToken].rewardPerTokenStored;
        }
        return rewardData[_rewardsToken].rewardPerTokenStored +
            (lastTimeRewardApplicable(_rewardsToken) - rewardData[_rewardsToken].lastUpdateTime) *
            rewardData[_rewardsToken].rewardRate * 1e18 / _totalSupply();
    }

    function earned(address account, address _rewardsToken) public view returns (uint256) {
        return (depositedAsset[account] * (rewardPerToken(_rewardsToken) - userRewardPerTokenPaid[account][_rewardsToken])) /
        1e18 + rewards[account][_rewardsToken];
    }

    function getRewardTokens() external view returns (address[] memory) {
        return rewardTokens;
    }

    function getRewardForDuration(address _rewardsToken) external view returns (uint256) {
        return rewardData[_rewardsToken].rewardRate * rewardData[_rewardsToken].rewardsDuration;
    }

    //multiRewards restricted functions
    function addReward(address _rewardsToken, uint256 _rewardsDuration) public onlyRewardManager {
        require(_rewardsToken != address(collateralAsset) && _rewardsToken != address(nUSD), "Reward cannot be collateral asset or nUSD");
        require(_rewardsDuration > 0, "Reward duration must be non-zero");
        require(rewardData[_rewardsToken].rewardsDuration == 0, "Reward already exists");
        rewardTokens.push(_rewardsToken);
        rewardData[_rewardsToken].rewardsDuration = _rewardsDuration;
    }

    function notifyRewardAmount(address _rewardsToken, uint256 reward) external onlyRewardManager updateReward(address(0)) {
        require(rewardData[_rewardsToken].rewardsDuration != 0, "Reward does not exist, addReward first");
        IERC20(_rewardsToken).safeTransferFrom(msg.sender, address(this), reward);
        if (block.timestamp >= rewardData[_rewardsToken].periodFinish) {
            rewardData[_rewardsToken].rewardRate = reward / rewardData[_rewardsToken].rewardsDuration;
        } else {
            uint256 remaining = rewardData[_rewardsToken].periodFinish - block.timestamp;
            uint256 leftover = remaining * rewardData[_rewardsToken].rewardRate;
            rewardData[_rewardsToken].rewardRate = (reward + leftover) / rewardData[_rewardsToken].rewardsDuration;
        }
        rewardData[_rewardsToken].lastUpdateTime = block.timestamp;
        rewardData[_rewardsToken].periodFinish = block.timestamp + rewardData[_rewardsToken].rewardsDuration;
        emit RewardAdded(reward);
    }

    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyRewardManager {
        require(tokenAddress != address(collateralAsset) && tokenAddress != address(nUSD), "Cannot withdraw collateral asset or nUSD");
        require(rewardData[tokenAddress].lastUpdateTime == 0, "Cannot withdraw reward token");
        IERC20(tokenAddress).safeTransfer(msg.sender, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    function setRewardsDuration(address _rewardsToken, uint256 _rewardsDuration) external onlyRewardManager {
        require(block.timestamp > rewardData[_rewardsToken].periodFinish, "Reward period still active");
        require(_rewardsDuration > 0, "Reward duration must be non-zero");
        rewardData[_rewardsToken].rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(_rewardsToken, rewardData[_rewardsToken].rewardsDuration);
    }

    //modifier
    modifier updateReward(address account) {
        for (uint256 i = 0; i < rewardTokens.length; ) {
            address token = rewardTokens[i];
            rewardData[token].rewardPerTokenStored = rewardPerToken(token);
            rewardData[token].lastUpdateTime = lastTimeRewardApplicable(token);
            if (account != address(0)) {
                rewards[account][token] = earned(account, token);
                userRewardPerTokenPaid[account][token] = rewardData[token].rewardPerTokenStored;
            }
            unchecked {i = i+1;}
        }
        _;
    }

    modifier onlyRewardManager() {
        require(configurator.isRewardManager(msg.sender), "Not reward manager");
        _;
    }

    //multirewards mutative functions
    function getReward() public nonReentrant updateReward(msg.sender) {
        for (uint256 i = 0; i < rewardTokens.length; ) {
            address _rewardsToken = rewardTokens[i];
            uint256 reward = rewards[msg.sender][_rewardsToken];
            if (reward > 0) {
                rewards[msg.sender][_rewardsToken] = 0;
                IERC20(_rewardsToken).safeTransfer(msg.sender, reward);
                emit RewardPaid(msg.sender, _rewardsToken, reward);
            }
            unchecked { i = i+1; }
        }
    }
}

{
  "compilationTarget": {
    "contracts/unstable/vaults/base/StakedEthVault.sol": "StakedEthVault"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 9999
  },
  "remappings": [
    ":@chainlink/=node_modules/@chainlink/",
    ":@eth-optimism/=node_modules/@eth-optimism/",
    ":@layerzerolabs/=node_modules/@layerzerolabs/",
    ":@openzeppelin-3/=node_modules/@layerzerolabs/solidity-examples/node_modules/@openzeppelin-3/",
    ":@openzeppelin/=node_modules/@openzeppelin/",
    ":@redstone-finance/=node_modules/@redstone-finance/",
    ":@uniswap/=node_modules/@uniswap/",
    ":erc721a/=node_modules/erc721a/",
    ":eth-gas-reporter/=node_modules/eth-gas-reporter/",
    ":forge-std/=lib/forge-std/src/",
    ":hardhat-deploy/=node_modules/hardhat-deploy/",
    ":hardhat/=node_modules/hardhat/"
  ]
}