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/*
ERC20FriendlyRewardModuleInfo

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

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

import "../interfaces/IRewardModule.sol";
import "../ERC20FriendlyRewardModule.sol";
import "../GysrUtils.sol";
import "./TokenUtilsInfo.sol";

/**
 * @title ERC20 friendly reward module info library
 *
 * @notice this library provides read-only convenience functions to query
 * additional information about the ERC20FriendlyRewardModule contract.
 */
library ERC20FriendlyRewardModuleInfo {
    using GysrUtils for uint256;
    using TokenUtilsInfo for IERC20;

    /**
     * @notice get all token metadata
     * @param module address of reward module
     * @return addresses_
     * @return names_
     * @return symbols_
     * @return decimals_
     */
    function tokens(
        address module
    )
        external
        view
        returns (
            address[] memory addresses_,
            string[] memory names_,
            string[] memory symbols_,
            uint8[] memory decimals_
        )
    {
        addresses_ = new address[](1);
        names_ = new string[](1);
        symbols_ = new string[](1);
        decimals_ = new uint8[](1);
        (addresses_[0], names_[0], symbols_[0], decimals_[0]) = token(module);
    }

    /**
     * @notice convenience function to get token metadata in a single call
     * @param module address of reward module
     * @return address
     * @return name
     * @return symbol
     * @return decimals
     */
    function token(
        address module
    ) public view returns (address, string memory, string memory, uint8) {
        IRewardModule m = IRewardModule(module);
        IERC20Metadata tkn = IERC20Metadata(m.tokens()[0]);
        return (address(tkn), tkn.name(), tkn.symbol(), tkn.decimals());
    }

    /**
     * @notice generic function to get pending reward balances
     * @param module address of reward module
     * @param account bytes32 account of interest for preview
     * @param shares number of shares that would be used
     * @return rewards_ estimated reward balances
     */
    function rewards(
        address module,
        bytes32 account,
        uint256 shares,
        bytes calldata
    ) public view returns (uint256[] memory rewards_) {
        rewards_ = new uint256[](1);
        (rewards_[0], , ) = preview(module, account, shares);
    }

    /**
     * @notice preview estimated rewards
     * @param module address of reward module
     * @param account bytes32 account of interest for preview
     * @param shares number of shares that would be unstaked
     * @return estimated reward
     * @return estimated time multiplier weighted by rewards
     * @return estimated gysr multiplier weighted by rewards
     */
    function preview(
        address module,
        bytes32 account,
        uint256 shares
    ) public view returns (uint256, uint256, uint256) {
        require(shares > 0, "frmi1");
        ERC20FriendlyRewardModule m = ERC20FriendlyRewardModule(module);

        uint256 reward;
        uint256 rawSum;
        uint256 bonusSum;

        uint256 i = m.stakeCount(account);

        // redeem first-in-last-out
        while (shares > 0) {
            require(i > 0, "frmi2");
            i -= 1;

            (uint256 s, , , , ) = m.stakes(account, i);

            // only redeem partial stake if more shares left than needed to burn
            s = s <= shares ? s : shares;

            uint256 r;
            {
                r = rewardsPerStakedShare(module);
            }

            {
                (, , , uint256 tally, ) = m.stakes(account, i);
                r = ((r - tally) * s) / 1e18;
                rawSum += r;
            }

            {
                (, , uint256 bonus, , ) = m.stakes(account, i);
                r = (r * bonus) / 1e18;
                bonusSum += r;
            }

            {
                (, , , , uint256 time) = m.stakes(account, i);
                r = (r * m.timeVestingCoefficient(time)) / 1e18;
            }
            reward += r;
            shares -= s;
        }

        address tkn = m.tokens()[0];
        return (
            IERC20(tkn).getAmount(module, m.totalShares(tkn), reward),
            reward > 0 ? (reward * 1e18) / bonusSum : 0,
            reward > 0 ? (bonusSum * 1e18) / rawSum : 0
        );
    }

    /**
     * @notice compute reward shares to be unlocked on the next update
     * @param module address of reward module
     * @return estimated unlockable rewards
     */
    function unlockable(address module) public view returns (uint256) {
        ERC20FriendlyRewardModule m = ERC20FriendlyRewardModule(module);
        address tkn = m.tokens()[0];
        if (m.lockedShares(tkn) == 0) {
            return 0;
        }
        uint256 sharesToUnlock = 0;
        for (uint256 i = 0; i < m.fundingCount(tkn); i++) {
            sharesToUnlock = sharesToUnlock + m.unlockable(tkn, i);
        }
        return sharesToUnlock;
    }

    /**
     * @notice compute effective unlocked rewards
     * @param module address of reward module
     * @return estimated current unlocked rewards
     */
    function unlocked(address module) public view returns (uint256) {
        ERC20FriendlyRewardModule m = ERC20FriendlyRewardModule(module);
        IERC20 tkn = IERC20(m.tokens()[0]);
        uint256 totalShares = m.totalShares(address(tkn));
        if (totalShares == 0) {
            return 0;
        }
        uint256 shares = unlockable(module);
        uint256 amount = tkn.getAmount(module, totalShares, shares);
        return m.totalUnlocked() + amount;
    }

    /**
     * @notice compute effective rewards per staked share
     * @param module module contract address
     * @return estimated rewards per staked share
     */
    function rewardsPerStakedShare(
        address module
    ) public view returns (uint256) {
        ERC20FriendlyRewardModule m = ERC20FriendlyRewardModule(module);
        if (m.totalStakingShares() == 0) {
            return m.rewardsPerStakedShare();
        }
        uint256 rewardsToUnlock = unlockable(module) + m.rewardDust();
        return
            m.rewardsPerStakedShare() +
            (rewardsToUnlock * 1e18) /
            m.totalStakingShares();
    }

    /**
     * @notice compute estimated GYSR bonus for stake
     * @param module module contract address
     * @param shares number of shares that would be staked
     * @param gysr number of GYSR tokens that would be applied to stake
     * @return estimated GYSR multiplier
     */
    function gysrBonus(
        address module,
        uint256 shares,
        uint256 gysr
    ) public view returns (uint256) {
        ERC20FriendlyRewardModule m = ERC20FriendlyRewardModule(module);
        return
            gysr.gysrBonus(
                shares,
                m.totalRawStakingShares() + shares,
                m.usage()
            );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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;
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface 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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-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;

    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));
        }
    }

    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");
        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 (last updated v4.8.0) (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
     * ====
     *
     * [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://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 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);
        }
    }
}

/*
ERC20BaseRewardModule

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

import "./interfaces/IRewardModule.sol";
import "./OwnerController.sol";
import "./TokenUtils.sol";

/**
 * @title ERC20 base reward module
 *
 * @notice this abstract class implements common ERC20 funding and unlocking
 * logic, which is inherited by other reward modules.
 */
abstract contract ERC20BaseRewardModule is
    IRewardModule,
    ReentrancyGuard,
    OwnerController
{
    using SafeERC20 for IERC20;
    using TokenUtils for IERC20;

    // single funding/reward schedule
    struct Funding {
        uint256 amount;
        uint256 shares;
        uint256 locked;
        uint64 updated;
        uint64 start;
        uint64 duration;
    }

    // constants
    uint256 public constant MAX_ACTIVE_FUNDINGS = 16;

    // funding/reward state fields
    mapping(address => Funding[]) private _fundings;
    mapping(address => uint256) private _shares;
    mapping(address => uint256) private _locked;

    /**
     * @notice getter for total token shares
     */
    function totalShares(address token) public view returns (uint256) {
        return _shares[token];
    }

    /**
     * @notice getter for total locked token shares
     */
    function lockedShares(address token) public view returns (uint256) {
        return _locked[token];
    }

    /**
     * @notice getter for funding schedule struct
     */
    function fundings(
        address token,
        uint256 index
    )
        public
        view
        returns (
            uint256 amount,
            uint256 shares,
            uint256 locked,
            uint256 updated,
            uint256 start,
            uint256 duration
        )
    {
        Funding storage f = _fundings[token][index];
        return (f.amount, f.shares, f.locked, f.updated, f.start, f.duration);
    }

    /**
     * @param token contract address of reward token
     * @return number of active funding schedules
     */
    function fundingCount(address token) public view returns (uint256) {
        return _fundings[token].length;
    }

    /**
     * @notice compute number of unlockable shares for a specific funding schedule
     * @param token contract address of reward token
     * @param idx index of the funding
     * @return the number of unlockable shares
     */
    function unlockable(
        address token,
        uint256 idx
    ) public view returns (uint256) {
        Funding storage funding = _fundings[token][idx];
        return _unlockable(funding);
    }

    /**
     * @notice internal method to compute number of unlockable shares for a specific funding schedule
     * @param funding the funding schedule struct of interest
     * @return the number of unlockable shares
     */
    function _unlockable(
        Funding storage funding
    ) private view returns (uint256) {
        // funding schedule is in future
        if (block.timestamp < funding.start) {
            return 0;
        }
        // empty
        if (funding.locked == 0) {
            return 0;
        }
        // handle zero-duration period or leftover dust from integer division
        if (block.timestamp >= funding.start + funding.duration) {
            return funding.locked;
        }

        return
            ((block.timestamp - funding.updated) * funding.shares) /
            funding.duration;
    }

    /**
     * @notice fund pool by locking up reward tokens for future distribution
     * @param token contract address of reward token
     * @param amount number of reward tokens to lock up as funding
     * @param duration period (seconds) over which funding will be unlocked
     * @param start time (seconds) at which funding begins to unlock
     * @param feeReceiver address to receive funding fee
     * @param feeRate portion of funding amount to take as fee
     */
    function _fund(
        address token,
        uint256 amount,
        uint256 duration,
        uint256 start,
        address feeReceiver,
        uint256 feeRate
    ) internal nonReentrant {
        requireController();
        // validate
        require(token != address(0));
        require(amount > 0, "rm1");
        require(start >= block.timestamp, "rm2");
        require(_fundings[token].length < MAX_ACTIVE_FUNDINGS, "rm3");

        IERC20 rewardToken = IERC20(token);
        uint256 minted = rewardToken.receiveWithFee(
            _shares[token],
            msg.sender,
            amount,
            feeReceiver,
            feeRate
        );

        _locked[token] += minted;
        _shares[token] += minted;

        // create new funding
        _fundings[token].push(
            Funding({
                amount: amount,
                shares: minted,
                locked: minted,
                updated: uint64(start),
                start: uint64(start),
                duration: uint64(duration)
            })
        );

        emit RewardsFunded(token, amount, minted, start);
    }

    /**
     * @dev internal function to clean up stale funding schedules
     * @param token contract address of reward token to clean up
     */
    function _clean(address token) internal {
        // check for stale funding schedules to expire
        uint256 removed = 0;
        uint256 originalSize = _fundings[token].length;
        for (uint256 i; i < originalSize; ) {
            uint256 idx = i - removed;
            Funding storage funding = _fundings[token][idx];
            if (
                _unlockable(funding) == 0 &&
                block.timestamp >= funding.start + funding.duration
            ) {
                emit RewardsExpired(
                    token,
                    funding.amount,
                    funding.shares,
                    funding.start
                );

                // remove at idx by copying last element here, then popping off last
                // (we don't care about order)
                _fundings[token][idx] = _fundings[token][
                    _fundings[token].length - 1
                ];
                _fundings[token].pop();
                removed++;
            }
            unchecked {
                ++i;
            }
        }
    }

    /**
     * @dev unlocks reward tokens based on funding schedules
     * @param token contract addres of reward token
     * @return shares number of shares unlocked
     */
    function _unlockTokens(address token) internal returns (uint256 shares) {
        // get unlockable shares for each funding schedule
        uint256 len = _fundings[token].length;
        for (uint256 i; i < len; ) {
            Funding storage funding = _fundings[token][i];
            uint256 s = _unlockable(funding);
            if (s > 0) {
                funding.locked -= s;
                funding.updated = uint64(block.timestamp);
                shares += s;
            }
            unchecked {
                ++i;
            }
        }

        // do unlocking
        if (shares > 0) {
            _locked[token] -= shares;
        }
    }

    /**
     * @dev distribute reward tokens to user
     * @param user address of user receiving rweard
     * @param token contract address of reward token
     * @param shares number of shares to be distributed
     * @return amount number of reward tokens distributed
     */
    function _distribute(
        address user,
        address token,
        uint256 shares
    ) internal returns (uint256 amount) {
        // compute reward amount in tokens
        IERC20 rewardToken = IERC20(token);
        uint256 total = _shares[token];
        amount = rewardToken.getAmount(total, shares);

        // update overall reward shares
        _shares[token] = total - shares;

        // do reward
        rewardToken.safeTransfer(user, amount);
        emit RewardsDistributed(user, token, amount, shares);
    }
}

/*
ERC20FriendlyRewardModule

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

import "./interfaces/IRewardModule.sol";
import "./interfaces/IConfiguration.sol";
import "./ERC20BaseRewardModule.sol";
import "./GysrUtils.sol";

/**
 * @title ERC20 friendly reward module
 *
 * @notice this reward module distributes a single ERC20 token as the staking reward.
 * It is designed to offer simple and predictable reward mechanics.
 *
 * @dev rewards are immutable once earned, and can be claimed by the user at
 * any time. The module can be configured with a linear vesting schedule to
 * incentivize longer term staking. The user can spend GYSR at the time of
 * staking to receive a multiplier on their earning rate.
 */
contract ERC20FriendlyRewardModule is ERC20BaseRewardModule {
    using GysrUtils for uint256;
    using TokenUtils for IERC20;

    // constants
    uint256 public constant FULL_VESTING = 1e18;

    // single stake by user
    struct Stake {
        uint256 shares;
        uint256 gysr;
        uint256 bonus;
        uint256 rewardTally;
        uint256 timestamp;
    }

    // mapping of user to all of their stakes
    mapping(bytes32 => Stake[]) public stakes;

    // total shares without GYSR multiplier applied
    uint256 public totalRawStakingShares;
    // total shares with GYSR multiplier applied
    uint256 public totalStakingShares;
    // counter representing the current rate of rewards per share
    uint256 public rewardsPerStakedShare;
    // value to keep track of earnings to be put back into the pool
    uint256 public rewardDust;
    // timestamp of last update
    uint256 public lastUpdated;

    // minimum ratio of earned rewards measured against FULL_VESTING (i.e. 2.5 * 10^17 would be 25%)
    uint256 public immutable vestingStart;
    // length of time in seconds until the user receives a FULL_VESTING (1x) multiplier on rewards
    uint256 public immutable vestingPeriod;

    IERC20 private immutable _token;
    address private immutable _factory;
    IConfiguration private immutable _config;

    /**
     * @param token_ the token that will be rewarded
     * @param vestingStart_ minimum ratio earned
     * @param vestingPeriod_ period (in seconds) over which investors vest to 100%
     * @param config_ address for configuration contract
     * @param factory_ address of module factory
     */
    constructor(
        address token_,
        uint256 vestingStart_,
        uint256 vestingPeriod_,
        address config_,
        address factory_
    ) {
        require(token_ != address(0));
        require(vestingStart_ <= FULL_VESTING, "frm1");

        _token = IERC20(token_);
        _config = IConfiguration(config_);
        _factory = factory_;

        vestingStart = vestingStart_;
        vestingPeriod = vestingPeriod_;

        lastUpdated = block.timestamp;
    }

    /**
     * @inheritdoc IRewardModule
     */
    function tokens()
        external
        view
        override
        returns (address[] memory tokens_)
    {
        tokens_ = new address[](1);
        tokens_[0] = address(_token);
    }

    /**
     * @inheritdoc IRewardModule
     */
    function factory() external view override returns (address) {
        return _factory;
    }

    /**
     * @inheritdoc IRewardModule
     */
    function balances()
        external
        view
        override
        returns (uint256[] memory balances_)
    {
        balances_ = new uint256[](1);
        balances_[0] = totalLocked();
    }

    /**
     * @inheritdoc IRewardModule
     */
    function usage() external view override returns (uint256) {
        return _usage();
    }

    /**
     * @inheritdoc IRewardModule
     */
    function stake(
        bytes32 account,
        address sender,
        uint256 shares,
        bytes calldata data
    ) external override onlyOwner returns (uint256, uint256) {
        _update();
        return _stake(account, sender, shares, data);
    }

    /**
     * @notice internal implementation of stake method
     * @param account bytes32 id of staking account
     * @param sender address of sender
     * @param shares number of new shares minted
     * @param data addtional data
     * @return amount of gysr spent
     * @return amount of gysr vested
     */
    function _stake(
        bytes32 account,
        address sender,
        uint256 shares,
        bytes calldata data
    ) internal returns (uint256, uint256) {
        require(data.length == 0 || data.length == 32, "frm2");

        uint256 gysr;
        if (data.length == 32) {
            gysr = abi.decode(data, (uint256));
        }

        uint256 bonus = gysr.gysrBonus(
            shares,
            totalRawStakingShares + shares,
            _usage()
        );

        if (gysr > 0) {
            emit GysrSpent(sender, gysr);
        }

        // update user staking info
        stakes[account].push(
            Stake(shares, gysr, bonus, rewardsPerStakedShare, block.timestamp)
        );

        // add new shares to global totals
        totalRawStakingShares += shares;
        totalStakingShares += (shares * bonus) / 1e18;

        return (gysr, 0);
    }

    /**
     * @inheritdoc IRewardModule
     */
    function unstake(
        bytes32 account,
        address sender,
        address receiver,
        uint256 shares,
        bytes calldata
    ) external override onlyOwner returns (uint256, uint256) {
        _update();
        return _unstake(account, sender, receiver, shares);
    }

    /**
     * @notice internal implementation of unstake
     * @param account bytes32 of staking account
     * @param sender address of sender
     * @param receiver address of reward receiver
     * @param shares number of shares burned
     * @return amount of gysr spent
     * @return amount of gysr vested
     */
    function _unstake(
        bytes32 account,
        address sender,
        address receiver,
        uint256 shares
    ) internal returns (uint256, uint256) {
        // note: we assume shares has been validated upstream

        // redeem first-in-last-out
        uint256 sharesLeftToBurn = shares;
        Stake[] storage userStakes = stakes[account];
        uint256 rewardAmount;
        uint256 gysrVested;
        uint256 preVestingRewards;
        uint256 timeVestingCoeff;
        while (sharesLeftToBurn > 0) {
            Stake storage lastStake = userStakes[userStakes.length - 1];
            require(lastStake.timestamp < block.timestamp, "frm3");

            if (lastStake.shares <= sharesLeftToBurn) {
                // fully redeem a past stake

                preVestingRewards = _rewardForStakedShares(
                    lastStake.shares,
                    lastStake.bonus,
                    lastStake.rewardTally
                );

                timeVestingCoeff = timeVestingCoefficient(lastStake.timestamp);
                rewardAmount += (preVestingRewards * timeVestingCoeff) / 1e18;

                rewardDust +=
                    (preVestingRewards * (FULL_VESTING - timeVestingCoeff)) /
                    1e18;

                totalStakingShares -=
                    (lastStake.shares * lastStake.bonus) /
                    1e18;
                sharesLeftToBurn -= lastStake.shares;
                gysrVested += lastStake.gysr;
                userStakes.pop();
            } else {
                // partially redeem a past stake

                preVestingRewards = _rewardForStakedShares(
                    sharesLeftToBurn,
                    lastStake.bonus,
                    lastStake.rewardTally
                );

                timeVestingCoeff = timeVestingCoefficient(lastStake.timestamp);
                rewardAmount += (preVestingRewards * timeVestingCoeff) / 1e18;

                rewardDust +=
                    (preVestingRewards * (FULL_VESTING - timeVestingCoeff)) /
                    1e18;

                totalStakingShares -=
                    (sharesLeftToBurn * lastStake.bonus) /
                    1e18;

                uint256 partialVested = (sharesLeftToBurn * lastStake.gysr) /
                    lastStake.shares;
                gysrVested += partialVested;
                lastStake.shares -= sharesLeftToBurn;
                lastStake.gysr -= partialVested;
                sharesLeftToBurn = 0;
            }
        }

        // update global totals
        totalRawStakingShares -= shares;

        if (rewardAmount > 0) {
            _distribute(receiver, address(_token), rewardAmount);
        }

        if (gysrVested > 0) {
            emit GysrVested(sender, gysrVested);
        }

        return (0, gysrVested);
    }

    /**
     * @inheritdoc IRewardModule
     */
    function claim(
        bytes32 account,
        address sender,
        address receiver,
        uint256 shares,
        bytes calldata data
    ) external override onlyOwner returns (uint256 spent, uint256 vested) {
        _update();
        (, vested) = _unstake(account, sender, receiver, shares);
        (spent, ) = _stake(account, sender, shares, data);
    }

    /**
     * @dev compute rewards owed for a specific stake
     * @param shares number of shares to calculate rewards for
     * @param bonus associated bonus for this stake
     * @param rewardTally associated rewardTally for this stake
     * @return reward for these staked shares
     */
    function _rewardForStakedShares(
        uint256 shares,
        uint256 bonus,
        uint256 rewardTally
    ) internal view returns (uint256) {
        return
            ((((rewardsPerStakedShare - rewardTally) * shares) / 1e18) *
                bonus) / 1e18; // counteract rewardsPerStakedShare coefficient // counteract bonus coefficient
    }

    /**
     * @notice compute vesting multiplier as function of staking time
     * @param time epoch time at which the tokens were staked
     * @return vesting multiplier rewards
     */
    function timeVestingCoefficient(
        uint256 time
    ) public view returns (uint256) {
        if (vestingPeriod == 0) return FULL_VESTING;
        uint256 stakeTime = block.timestamp - time;
        if (stakeTime > vestingPeriod) return FULL_VESTING;
        return
            vestingStart +
            (stakeTime * (FULL_VESTING - vestingStart)) /
            vestingPeriod;
    }

    /**
     * @inheritdoc IRewardModule
     */
    function update(bytes32, address, bytes calldata) external override {
        requireOwner();
        _update();
    }

    /**
     * @notice method called ad hoc to clean up and perform additional accounting
     * @dev will only be called manually, and should not contain any essential logic
     */
    function clean(bytes calldata) external override {
        requireOwner();
        _update();
        _clean(address(_token));
    }

    /**
     * @notice fund module by locking up reward tokens for distribution
     * @param amount number of reward tokens to lock up as funding
     * @param duration period (seconds) over which funding will be unlocked
     */
    function fund(uint256 amount, uint256 duration) external {
        _fund(address(_token), amount, duration, block.timestamp);
    }

    /**
     * @notice fund module by locking up reward tokens for distribution
     * @param amount number of reward tokens to lock up as funding
     * @param duration period (seconds) over which funding will be unlocked
     * @param start time (seconds) at which funding begins to unlock
     */
    function fund(uint256 amount, uint256 duration, uint256 start) external {
        _fund(address(_token), amount, duration, start);
    }

    /**
     * @dev private helper method for funding with fee processing
     */
    function _fund(
        address token,
        uint256 amount,
        uint256 duration,
        uint256 start
    ) private {
        _update();

        // get fees
        (address receiver, uint256 rate) = _config.getAddressUint96(
            keccak256("gysr.core.friendly.fund.fee")
        );

        // do funding
        _fund(token, amount, duration, start, receiver, rate);
    }

    /**
     * @dev updates the internal accounting for rewards per staked share
     * retrieves unlocked tokens and adds on any unvested rewards from the last unstake operation
     */
    function _update() private {
        lastUpdated = block.timestamp;

        if (totalStakingShares == 0) {
            rewardsPerStakedShare = 0;
            return;
        }

        uint256 rewardsToUnlock = _unlockTokens(address(_token)) + rewardDust;
        rewardDust = 0;

        // global accounting
        rewardsPerStakedShare += (rewardsToUnlock * 1e18) / totalStakingShares;
    }

    /**
     * @return total number of locked reward tokens
     */
    function totalLocked() public view returns (uint256) {
        return
            _token.getAmount(
                totalShares(address(_token)),
                lockedShares(address(_token))
            );
    }

    /**
     * @return total number of unlocked reward tokens
     */
    function totalUnlocked() public view returns (uint256) {
        uint256 total = totalShares(address(_token));
        uint256 locked = lockedShares(address(_token));
        return _token.getAmount(total, total - locked);
    }

    /**
     * @dev internal helper to get current usage ratio
     * @return GYSR usage ratio
     */
    function _usage() private view returns (uint256) {
        if (totalStakingShares == 0) {
            return 0;
        }
        return
            ((totalStakingShares - totalRawStakingShares) * 1e18) /
            totalStakingShares;
    }

    /**
     * @param account bytes32 id for account of interest
     * @return number of active stakes for user
     */
    function stakeCount(bytes32 account) public view returns (uint256) {
        return stakes[account].length;
    }
}

/*
GysrUtils

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

import "./MathUtils.sol";

/**
 * @title GYSR utilities
 *
 * @notice this library implements utility methods for the GYSR multiplier
 * and spending mechanics
 */
library GysrUtils {
    using MathUtils for int128;

    // constants
    uint256 public constant GYSR_PROPORTION = 1e16; // 1%

    /**
     * @notice compute GYSR bonus as a function of usage ratio, stake amount,
     * and GYSR spent
     * @param gysr number of GYSR token applied to bonus
     * @param amount number of tokens or shares to unstake
     * @param total number of tokens or shares in overall pool
     * @param ratio usage ratio from 0 to 1
     * @return multiplier value
     */
    function gysrBonus(
        uint256 gysr,
        uint256 amount,
        uint256 total,
        uint256 ratio
    ) internal pure returns (uint256) {
        if (amount == 0) {
            return 0;
        }
        if (total == 0) {
            return 0;
        }
        if (gysr == 0) {
            return 1e18;
        }

        // scale GYSR amount with respect to proportion
        uint256 portion = (GYSR_PROPORTION * total) / 1e18;
        if (amount > portion) {
            gysr = (gysr * portion) / amount;
        }

        // 1 + gysr / (0.01 + ratio)
        uint256 x = 2 ** 64 + (2 ** 64 * gysr) / (1e16 + ratio);

        return
            1e18 +
            (uint256(int256(int128(uint128(x)).logbase10())) * 1e18) /
            2 ** 64;
    }
}

/*
TokenUtilsInfo

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

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

/**
 * @title Token utilities info
 *
 * @notice this library implements utility methods for token handling,
 * dynamic balance accounting, and fee processing.
 *
 * this is a modified version to be used by info libraries.
 */
library TokenUtilsInfo {
    uint256 constant INITIAL_SHARES_PER_TOKEN = 1e6;
    uint256 constant FLOOR_SHARES_PER_TOKEN = 1e3;

    /**
     * @notice get token shares from amount
     * @param token erc20 token interface
     * @param module address of module
     * @param total current total shares
     * @param amount balance of tokens
     */
    function getShares(
        IERC20 token,
        address module,
        uint256 total,
        uint256 amount
    ) internal view returns (uint256) {
        if (total == 0) return 0;
        uint256 balance = token.balanceOf(module);
        if (total < balance * FLOOR_SHARES_PER_TOKEN)
            return amount * FLOOR_SHARES_PER_TOKEN;
        return (total * amount) / balance;
    }

    /**
     * @notice get token amount from shares
     * @param token erc20 token interface
     * @param module address of module
     * @param total current total shares
     * @param shares balance of shares
     */
    function getAmount(
        IERC20 token,
        address module,
        uint256 total,
        uint256 shares
    ) internal view returns (uint256) {
        if (total == 0) return 0;
        uint256 balance = token.balanceOf(module);
        if (total < balance * FLOOR_SHARES_PER_TOKEN)
            return shares / FLOOR_SHARES_PER_TOKEN;
        return (balance * shares) / total;
    }
}

/*
IConfiguration

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

/**
 * @title Configuration interface
 *
 * @notice this defines the protocol configuration interface
 */
interface IConfiguration {
    // events
    event ParameterUpdated(bytes32 indexed key, address value);
    event ParameterUpdated(bytes32 indexed key, uint256 value);
    event ParameterUpdated(bytes32 indexed key, address value0, uint96 value1);
    event ParameterOverridden(
        address indexed caller,
        bytes32 indexed key,
        address value
    );
    event ParameterOverridden(
        address indexed caller,
        bytes32 indexed key,
        uint256 value
    );
    event ParameterOverridden(
        address indexed caller,
        bytes32 indexed key,
        address value0,
        uint96 value1
    );

    /**
     * @notice set or update uint256 parameter
     * @param key keccak256 hash of parameter key
     * @param value uint256 parameter value
     */
    function setUint256(bytes32 key, uint256 value) external;

    /**
     * @notice set or update address parameter
     * @param key keccak256 hash of parameter key
     * @param value address parameter value
     */
    function setAddress(bytes32 key, address value) external;

    /**
     * @notice set or update packed address + uint96 pair
     * @param key keccak256 hash of parameter key
     * @param value0 address parameter value
     * @param value1 uint96 parameter value
     */
    function setAddressUint96(
        bytes32 key,
        address value0,
        uint96 value1
    ) external;

    /**
     * @notice get uint256 parameter
     * @param key keccak256 hash of parameter key
     * @return uint256 parameter value
     */
    function getUint256(bytes32 key) external view returns (uint256);

    /**
     * @notice get address parameter
     * @param key keccak256 hash of parameter key
     * @return uint256 parameter value
     */
    function getAddress(bytes32 key) external view returns (address);

    /**
     * @notice get packed address + uint96 pair
     * @param key keccak256 hash of parameter key
     * @return address parameter value
     * @return uint96 parameter value
     */
    function getAddressUint96(
        bytes32 key
    ) external view returns (address, uint96);

    /**
     * @notice override uint256 parameter for specific caller
     * @param caller address of caller
     * @param key keccak256 hash of parameter key
     * @param value uint256 parameter value
     */
    function overrideUint256(
        address caller,
        bytes32 key,
        uint256 value
    ) external;

    /**
     * @notice override address parameter for specific caller
     * @param caller address of caller
     * @param key keccak256 hash of parameter key
     * @param value address parameter value
     */
    function overrideAddress(
        address caller,
        bytes32 key,
        address value
    ) external;

    /**
     * @notice override address parameter for specific caller
     * @param caller address of caller
     * @param key keccak256 hash of parameter key
     * @param value0 address parameter value
     * @param value1 uint96 parameter value
     */
    function overrideAddressUint96(
        address caller,
        bytes32 key,
        address value0,
        uint96 value1
    ) external;
}

/*
IEvents

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
 */

pragma solidity 0.8.18;

/**
 * @title GYSR event system
 *
 * @notice common interface to define GYSR event system
 */
interface IEvents {
    // staking
    event Staked(
        bytes32 indexed account,
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );
    event Unstaked(
        bytes32 indexed account,
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );
    event Claimed(
        bytes32 indexed account,
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );
    event Updated(bytes32 indexed account, address indexed user);

    // rewards
    event RewardsDistributed(
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );
    event RewardsFunded(
        address indexed token,
        uint256 amount,
        uint256 shares,
        uint256 timestamp
    );
    event RewardsExpired(
        address indexed token,
        uint256 amount,
        uint256 shares,
        uint256 timestamp
    );
    event RewardsWithdrawn(
        address indexed token,
        uint256 amount,
        uint256 shares,
        uint256 timestamp
    );
    event RewardsUpdated(bytes32 indexed account);

    // gysr
    event GysrSpent(address indexed user, uint256 amount);
    event GysrVested(address indexed user, uint256 amount);
    event GysrWithdrawn(uint256 amount);
    event Fee(address indexed receiver, address indexed token, uint256 amount);
}

/*
IOwnerController

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

/**
 * @title Owner controller interface
 *
 * @notice this defines the interface for any contracts that use the
 * owner controller access pattern
 */
interface IOwnerController {
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() external view returns (address);

    /**
     * @dev Returns the address of the current controller.
     */
    function controller() external view returns (address);

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`). This can
     * include renouncing ownership by transferring to the zero address.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) external;

    /**
     * @dev Transfers control of the contract to a new account (`newController`).
     * Can only be called by the owner.
     */
    function transferControl(address newController) external;
}

/*
IRewardModule

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

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

import "./IEvents.sol";
import "./IOwnerController.sol";

/**
 * @title Reward module interface
 *
 * @notice this contract defines the common interface that any reward module
 * must implement to be compatible with the modular Pool architecture.
 */
interface IRewardModule is IOwnerController, IEvents {
    /**
     * @return array of reward tokens
     */
    function tokens() external view returns (address[] memory);

    /**
     * @return array of reward token balances
     */
    function balances() external view returns (uint256[] memory);

    /**
     * @return GYSR usage ratio for reward module
     */
    function usage() external view returns (uint256);

    /**
     * @return address of module factory
     */
    function factory() external view returns (address);

    /**
     * @notice perform any necessary accounting for new stake
     * @param account bytes32 id of staking account
     * @param sender address of sender
     * @param shares number of new shares minted
     * @param data addtional data
     * @return amount of gysr spent
     * @return amount of gysr vested
     */
    function stake(
        bytes32 account,
        address sender,
        uint256 shares,
        bytes calldata data
    ) external returns (uint256, uint256);

    /**
     * @notice reward user and perform any necessary accounting for unstake
     * @param account bytes32 id of staking account
     * @param sender address of sender
     * @param receiver address of reward receiver
     * @param shares number of shares burned
     * @param data additional data
     * @return amount of gysr spent
     * @return amount of gysr vested
     */
    function unstake(
        bytes32 account,
        address sender,
        address receiver,
        uint256 shares,
        bytes calldata data
    ) external returns (uint256, uint256);

    /**
     * @notice reward user and perform and necessary accounting for existing stake
     * @param account bytes32 id of staking account
     * @param sender address of sender
     * @param receiver address of reward receiver
     * @param shares number of shares being claimed against
     * @param data additional data
     * @return amount of gysr spent
     * @return amount of gysr vested
     */
    function claim(
        bytes32 account,
        address sender,
        address receiver,
        uint256 shares,
        bytes calldata data
    ) external returns (uint256, uint256);

    /**
     * @notice method called by anyone to update accounting
     * @dev will only be called ad hoc and should not contain essential logic
     * @param account bytes32 id of staking account for update
     * @param sender address of sender
     * @param data additional data
     */
    function update(
        bytes32 account,
        address sender,
        bytes calldata data
    ) external;

    /**
     * @notice method called by owner to clean up and perform additional accounting
     * @dev will only be called ad hoc and should not contain any essential logic
     * @param data additional data
     */
    function clean(bytes calldata data) external;
}

/*
MathUtils

https://github.com/gysr-io/core

SPDX-License-Identifier: BSD-4-Clause
*/

pragma solidity 0.8.18;

/**
 * @title Math utilities
 *
 * @notice this library implements various logarithmic math utilies which support
 * other contracts and specifically the GYSR multiplier calculation
 *
 * @dev h/t https://github.com/abdk-consulting/abdk-libraries-solidity
 */
library MathUtils {
    /**
     * @notice calculate binary logarithm of x
     *
     * @param x signed 64.64-bit fixed point number, require x > 0
     * @return signed 64.64-bit fixed point number
     */
    function logbase2(int128 x) internal pure returns (int128) {
        unchecked {
            require(x > 0);

            int256 msb = 0;
            int256 xc = x;
            if (xc >= 0x10000000000000000) {
                xc >>= 64;
                msb += 64;
            }
            if (xc >= 0x100000000) {
                xc >>= 32;
                msb += 32;
            }
            if (xc >= 0x10000) {
                xc >>= 16;
                msb += 16;
            }
            if (xc >= 0x100) {
                xc >>= 8;
                msb += 8;
            }
            if (xc >= 0x10) {
                xc >>= 4;
                msb += 4;
            }
            if (xc >= 0x4) {
                xc >>= 2;
                msb += 2;
            }
            if (xc >= 0x2) msb += 1; // No need to shift xc anymore

            int256 result = (msb - 64) << 64;
            uint256 ux = uint256(int256(x)) << uint256(127 - msb);
            for (int256 bit = 0x8000000000000000; bit > 0; bit >>= 1) {
                ux *= ux;
                uint256 b = ux >> 255;
                ux >>= 127 + b;
                result += bit * int256(b);
            }

            return int128(result);
        }
    }

    /**
     * @notice calculate natural logarithm of x
     * @dev magic constant comes from ln(2) * 2^128 -> hex
     * @param x signed 64.64-bit fixed point number, require x > 0
     * @return signed 64.64-bit fixed point number
     */
    function ln(int128 x) internal pure returns (int128) {
        unchecked {
            require(x > 0);

            return
                int128(
                    int256(
                        (uint256(int256(logbase2(x))) *
                            0xB17217F7D1CF79ABC9E3B39803F2F6AF) >> 128
                    )
                );
        }
    }

    /**
     * @notice calculate logarithm base 10 of x
     * @dev magic constant comes from log10(2) * 2^128 -> hex
     * @param x signed 64.64-bit fixed point number, require x > 0
     * @return signed 64.64-bit fixed point number
     */
    function logbase10(int128 x) internal pure returns (int128) {
        require(x > 0);

        return
            int128(
                int256(
                    (uint256(int256(logbase2(x))) *
                        0x4d104d427de7fce20a6e420e02236748) >> 128
                )
            );
    }

    // wrapper functions to allow testing
    function testlogbase2(int128 x) public pure returns (int128) {
        return logbase2(x);
    }

    function testlogbase10(int128 x) public pure returns (int128) {
        return logbase10(x);
    }
}

/*
OwnerController

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

import "./interfaces/IOwnerController.sol";

/**
 * @title Owner controller
 *
 * @notice this base contract implements an owner-controller access model.
 *
 * @dev the contract is an adapted version of the OpenZeppelin Ownable contract.
 * It allows the owner to designate an additional account as the controller to
 * perform restricted operations.
 *
 * Other changes include supporting role verification with a require method
 * in addition to the modifier option, and removing some unneeded functionality.
 *
 * Original contract here:
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol
 */
contract OwnerController is IOwnerController {
    address private _owner;
    address private _controller;

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

    event ControlTransferred(
        address indexed previousController,
        address indexed newController
    );

    constructor() {
        _owner = msg.sender;
        _controller = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
        emit ControlTransferred(address(0), _owner);
    }

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

    /**
     * @dev Returns the address of the current controller.
     */
    function controller() public view override returns (address) {
        return _controller;
    }

    /**
     * @dev Modifier that throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == msg.sender, "oc1");
        _;
    }

    /**
     * @dev Modifier that throws if called by any account other than the controller.
     */
    modifier onlyController() {
        require(_controller == msg.sender, "oc2");
        _;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    function requireOwner() internal view {
        require(_owner == msg.sender, "oc1");
    }

    /**
     * @dev Throws if called by any account other than the controller.
     */
    function requireController() internal view {
        require(_controller == msg.sender, "oc2");
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override {
        requireOwner();
        require(newOwner != address(0), "oc3");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    /**
     * @dev Transfers control of the contract to a new account (`newController`).
     * Can only be called by the owner.
     */
    function transferControl(address newController) public virtual override {
        requireOwner();
        require(newController != address(0), "oc4");
        emit ControlTransferred(_controller, newController);
        _controller = newController;
    }
}

/*
TokenUtils

https://github.com/gysr-io/core

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.18;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @title Token utilities
 *
 * @notice this library implements utility methods for token handling,
 * dynamic balance accounting, and fee processing
 */
library TokenUtils {
    using SafeERC20 for IERC20;

    event Fee(address indexed receiver, address indexed token, uint256 amount); // redefinition

    uint256 constant INITIAL_SHARES_PER_TOKEN = 1e6;
    uint256 constant FLOOR_SHARES_PER_TOKEN = 1e3;

    /**
     * @notice get token shares from amount
     * @param token erc20 token interface
     * @param total current total shares
     * @param amount balance of tokens
     */
    function getShares(
        IERC20 token,
        uint256 total,
        uint256 amount
    ) internal view returns (uint256) {
        if (total == 0) return 0;
        uint256 balance = token.balanceOf(address(this));
        if (total < balance * FLOOR_SHARES_PER_TOKEN)
            return amount * FLOOR_SHARES_PER_TOKEN;
        return (total * amount) / balance;
    }

    /**
     * @notice get token amount from shares
     * @param token erc20 token interface
     * @param total current total shares
     * @param shares balance of shares
     */
    function getAmount(
        IERC20 token,
        uint256 total,
        uint256 shares
    ) internal view returns (uint256) {
        if (total == 0) return 0;
        uint256 balance = token.balanceOf(address(this));
        if (total < balance * FLOOR_SHARES_PER_TOKEN)
            return shares / FLOOR_SHARES_PER_TOKEN;
        return (balance * shares) / total;
    }

    /**
     * @notice transfer tokens from sender into contract and convert to shares
     * for internal accounting
     * @param token erc20 token interface
     * @param total current total shares
     * @param sender token sender
     * @param amount number of tokens to be sent
     */
    function receiveAmount(
        IERC20 token,
        uint256 total,
        address sender,
        uint256 amount
    ) internal returns (uint256) {
        // note: we assume amount > 0 has already been validated

        //  transfer
        uint256 balance = token.balanceOf(address(this));
        token.safeTransferFrom(sender, address(this), amount);
        uint256 actual = token.balanceOf(address(this)) - balance;
        require(amount >= actual);

        // mint shares at current rate
        uint256 minted;
        if (total == 0) {
            minted = actual * INITIAL_SHARES_PER_TOKEN;
        } else if (total < balance * FLOOR_SHARES_PER_TOKEN) {
            minted = actual * FLOOR_SHARES_PER_TOKEN;
        } else {
            minted = (total * actual) / balance;
        }
        require(minted > 0);
        return minted;
    }

    /**
     * @notice transfer tokens from sender into contract, process protocol fee,
     * and convert to shares for internal accounting
     * @param token erc20 token interface
     * @param total current total shares
     * @param sender token sender
     * @param amount number of tokens to be sent
     * @param feeReceiver address to receive fee
     * @param feeRate portion of amount to take as fee in 18 decimals
     */
    function receiveWithFee(
        IERC20 token,
        uint256 total,
        address sender,
        uint256 amount,
        address feeReceiver,
        uint256 feeRate
    ) internal returns (uint256) {
        // note: we assume amount > 0 has already been validated

        // check initial token balance
        uint256 balance = token.balanceOf(address(this));

        // process fee
        uint256 fee;
        if (feeReceiver != address(0) && feeRate > 0 && feeRate < 1e18) {
            fee = (amount * feeRate) / 1e18;
            token.safeTransferFrom(sender, feeReceiver, fee);
            emit Fee(feeReceiver, address(token), fee);
        }

        // do transfer
        token.safeTransferFrom(sender, address(this), amount - fee);
        uint256 actual = token.balanceOf(address(this)) - balance;
        require(amount >= actual);

        // mint shares at current rate
        uint256 minted;
        if (total == 0) {
            minted = actual * INITIAL_SHARES_PER_TOKEN;
        } else if (total < balance * FLOOR_SHARES_PER_TOKEN) {
            minted = actual * FLOOR_SHARES_PER_TOKEN;
        } else {
            minted = (total * actual) / balance;
        }
        require(minted > 0);
        return minted;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"module","type":"address"},{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"uint256","name":"gysr","type":"uint256"}],"name":"gysrBonus","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"},{"internalType":"bytes32","name":"account","type":"bytes32"},{"internalType":"uint256","name":"shares","type":"uint256"}],"name":"preview","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"},{"internalType":"bytes32","name":"account","type":"bytes32"},{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"rewards","outputs":[{"internalType":"uint256[]","name":"rewards_","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"rewardsPerStakedShare","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"string","name":"","type":"string"},{"internalType":"string","name":"","type":"string"},{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"tokens","outputs":[{"internalType":"address[]","name":"addresses_","type":"address[]"},{"internalType":"string[]","name":"names_","type":"string[]"},{"internalType":"string[]","name":"symbols_","type":"string[]"},{"internalType":"uint8[]","name":"decimals_","type":"uint8[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"unlockable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"module","type":"address"}],"name":"unlocked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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