// 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
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

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

interface IBribe {
    /*----------  FUNCTIONS  --------------------------------------------*/
    function getReward(address account) external;
    function notifyRewardAmount(address token, uint amount) external;
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    function _deposit(uint amount, address account) external;
    function _withdraw(uint amount, address account) external;
    function addReward(address rewardToken) external;
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
    function balanceOf(address account) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    function rewardPerToken(address reward) external view returns (uint);
    function getRewardForDuration(address reward) external view returns (uint);
    function left(address reward) external view returns (uint);
    function earned(address account, address reward) external view returns (uint);
    function getRewardTokens() external view returns (address[] memory);
    function DURATION() external view returns (uint);
    function isRewardToken(address token) 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 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 v4.9.0) (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 IGauge {
    /*----------  FUNCTIONS  --------------------------------------------*/
    function getReward(address account) external;
    function notifyRewardAmount(address token, uint amount) external;
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    function _deposit(address account, uint256 amount) external;
    function _withdraw(address account, uint256 amount) external;
    function addReward(address rewardToken) external;
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
    function balanceOf(address account) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    function rewardPerToken(address reward) external view returns (uint);
    function getRewardForDuration(address reward) external view returns (uint);
    function earned(address account, address reward) external view returns (uint);
    function left(address token) external view returns (uint);
}

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

interface IVoter {
    /*----------  FUNCTIONS  --------------------------------------------*/
    function distribute(address _gauge) external;
    function emitDeposit(address account, uint amount) external;
    function emitWithdraw(address account, uint amount) external;
    function notifyRewardAmount(uint amount) external;
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
    function OTOKEN() external view returns (address);
    function plugins(uint256 index) external view returns (address);
    function getPlugins() external view returns (address[] memory);
    function gauges(address pool) external view returns (address);
    function bribes(address pool) external view returns (address);
    function isAlive(address gauge) external view returns (bool);
    function usedWeights(address account) external view returns (uint256);
    function weights(address pool) external view returns (uint256);
    function totalWeight() external view returns (uint256);
    function votes(address account, address pool) external view returns (uint256);
    function lastVoted(address account) external view returns (uint256);
    function minter() external view returns (address);
}

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

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "contracts/interfaces/IGauge.sol";
import "contracts/interfaces/IBribe.sol";
import "contracts/interfaces/IVoter.sol";

/**
 * @title Plugin
 * @author heesho
 * 
 * Plugins are contracts that can be used to integrate a yield-bearing asset with the Voting system.
 * The idea is that when a yield-bearing asset is added to this system, users can deposit it in a Plugin
 * to earn OTOKEN rewards. The Plugin will strip the yield from the yield-bearing asset and distribute it
 * as a voting reward to VTOKEN holders that voted for the Plugin. The Plugin contract is in charge of 
 * accepting deposits/withdrawals from accounts and updating their balances in the corresponding Gauge contract
 * so that they can receive OTOKEN rewards. The Plugin is also in charge of harvesting yield from the yield-bearing
 * asset (underlying) and distributing that yield to its corresponding Bribe contract.
 * 
 * Plugin balanceOf must be equal to Gauge balanceOf for all users at all times.
 * Plugin totalSupply must be equal to Gauge totalSupply at all times.
 */
abstract contract Plugin is ReentrancyGuard {
    using SafeERC20 for IERC20Metadata;

    /*----------  CONSTANTS  --------------------------------------------*/

    /*----------  STATE VARIABLES  --------------------------------------*/

    IERC20Metadata private immutable underlying;
    address private immutable OTOKEN;
    address private immutable voter;
    address private gauge;
    address private bribe;
    string private  protocol;
    address[] private tokensInUnderlying;
    address[] private bribeTokens;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

    /*----------  ERRORS ------------------------------------------------*/

    error Plugin__InvalidZeroInput();
    error Plugin__NotAuthorizedVoter();

    /*----------  EVENTS ------------------------------------------------*/

    event Plugin__Deposited(address indexed account, uint256 amount);
    event Plugin__Withdrawn(address indexed account, uint256 amount);
    event Plugin__ClaimedAnDistributed();

    /*----------  MODIFIERS  --------------------------------------------*/

    modifier nonZeroInput(uint256 _amount) {
        if (_amount == 0) revert Plugin__InvalidZeroInput();
        _;
    }

    modifier onlyVoter() {
        if (msg.sender != voter) revert Plugin__NotAuthorizedVoter();
        _;
    }

    /*----------  FUNCTIONS  --------------------------------------------*/

    constructor(
        address _underlying, 
        address _voter, 
        address[] memory _tokensInUnderlying, 
        address[] memory _bribeTokens,
        string memory _protocol
    ) {
        underlying = IERC20Metadata(_underlying);
        voter = _voter;
        tokensInUnderlying = _tokensInUnderlying;
        bribeTokens = _bribeTokens;
        protocol = _protocol;
        OTOKEN = IVoter(_voter).OTOKEN();
    }

    function depositFor(address account, uint256 amount) 
        public
        virtual
        nonReentrant
        nonZeroInput(amount)
    {
        _totalSupply = _totalSupply + amount;
        _balances[account] = _balances[account] + amount;
        emit Plugin__Deposited(account, amount);
        underlying.safeTransferFrom(msg.sender, address(this), amount);
        IGauge(gauge)._deposit(account, amount);
    }

    function withdrawTo(address account, uint256 amount)
        public
        virtual
        nonReentrant
        nonZeroInput(amount)
    {
        _totalSupply = _totalSupply - amount;
        _balances[msg.sender] = _balances[msg.sender] - amount;
        emit Plugin__Withdrawn(msg.sender, amount);
        IGauge(gauge)._withdraw(msg.sender, amount);
        underlying.safeTransfer(account, amount);
    }

    function claimAndDistribute() public virtual nonReentrant {
        emit Plugin__ClaimedAnDistributed();
    }

    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/

    function setGauge(address _gauge) external onlyVoter {
        gauge = _gauge;
    }

    function setBribe(address _bribe) external onlyVoter {
        bribe = _bribe;
    }

    /*----------  VIEW FUNCTIONS  ---------------------------------------*/

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    function getUnderlyingName() public view virtual returns (string memory) {
        return underlying.name();
    }

    function getUnderlyingSymbol() public view virtual returns (string memory) {
        return underlying.symbol();
    }

    function getUnderlyingAddress() public view virtual returns (address) {
        return address(underlying);
    }

    function getUnderlyingDecimals() public view virtual returns (uint8) {
        return underlying.decimals();
    }

    function getProtocol() public view virtual returns (string memory) {
        return protocol;
    }

    function getVoter() public view returns (address) {
        return voter;
    }

    function getGauge() public view returns (address) {
        return gauge;
    }

    function getBribe() public view returns (address) {
        return bribe;
    }

    function getTokensInUnderlying() public view virtual returns (address[] memory) {
        return tokensInUnderlying;
    }

    function getBribeTokens() public view returns (address[] memory) {
        return bribeTokens;
    }
}

// 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/access/Ownable.sol";
import 'contracts/Plugin.sol';

interface IVelociLP {
    function tokens() external view returns (address, address);
}

interface IRouter {
    function isPair(address _pool) external view returns (bool);
}

interface IVelociVoter {
    function gauges(address _lpToken) external view returns (address);
}

interface IPluginFactory {
    function VOTER() external view returns (address);
    function BVM() external view returns (address);
    function OBVM() external view returns (address);
}

interface IVelociGauge {
    function rewardsListLength() external view returns (uint256);
    function rewards(uint256 _index) external view returns (address);
    function deposit(uint256 _amount, uint256 _tokenId) external;
    function withdraw(uint256 _amount) external;
    function getReward(address _account, address[] memory _tokens) external;
}

contract VelociGaugePlugin is Plugin {
    using SafeERC20 for IERC20;

    /*----------  CONSTANTS  --------------------------------------------*/

    /*----------  STATE VARIABLES  --------------------------------------*/

    address public immutable pluginFactory;
    address public immutable velociGauge;
    address[] public velociGaugeRewards;
    string public symbol;

    /*----------  ERRORS ------------------------------------------------*/

    error Plugin__NotFactory();

    /*----------  FUNCTIONS  --------------------------------------------*/

    constructor(
        address _underlying, 
        address _velociGauge,
        address _pluginFactory,
        address[] memory _tokensInUnderlying, 
        address[] memory _bribeTokens,
        address[] memory _velociGaugeRewards,
        string memory _protocol,
        string memory _symbol
    )
        Plugin(
            _underlying, 
            IPluginFactory(_pluginFactory).VOTER(), 
            _tokensInUnderlying, 
            _bribeTokens,
            _protocol
        )
    {
        pluginFactory = _pluginFactory;
        velociGauge = _velociGauge;
        velociGaugeRewards = _velociGaugeRewards;
        symbol = _symbol;
    }

    function claimAndDistribute() 
        public 
        override 
    {
        super.claimAndDistribute();
        IVelociGauge(velociGauge).getReward(address(this), velociGaugeRewards);
        address bribe = getBribe();
        uint256 duration = IBribe(bribe).DURATION();
        for (uint i = 0; i < velociGaugeRewards.length; i++) {
            address token = (velociGaugeRewards[i] == IPluginFactory(pluginFactory).BVM() ? IPluginFactory(pluginFactory).OBVM() : velociGaugeRewards[i]);
            uint256 balance = IERC20(token).balanceOf(address(this));
            if (balance > duration && token != getUnderlyingAddress()) {
                IERC20(token).safeApprove(bribe, 0);
                IERC20(token).safeApprove(bribe, balance);
                IBribe(bribe).notifyRewardAmount(token, balance);
            }
        }
    }

    function depositFor(address account, uint256 amount) 
        public 
        override 
    {
        super.depositFor(account, amount);
        IERC20(getUnderlyingAddress()).safeApprove(velociGauge, 0);
        IERC20(getUnderlyingAddress()).safeApprove(velociGauge, amount);
        IVelociGauge(velociGauge).deposit(amount, 0);
    }

    function withdrawTo(address account, uint256 amount) 
        public 
        override 
    {
        IVelociGauge(velociGauge).withdraw(amount); 
        super.withdrawTo(account, amount);
    }

    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/

    function setGaugeRewards(address[] memory _gaugeRewards) external {
        if (msg.sender != pluginFactory) revert Plugin__NotFactory();
        velociGaugeRewards = _gaugeRewards;
    }

    /*----------  VIEW FUNCTIONS  ---------------------------------------*/

    function getUnderlyingName() public view override returns (string memory) {
        return symbol;
    }

    function getUnderlyingSymbol() public view override returns (string memory) {
        return symbol;
    }

}


contract VelociGaugePluginFactory is Ownable {

    address public constant BVM = 0xd386a121991E51Eab5e3433Bf5B1cF4C8884b47a;
    address public constant OBVM = 0x762eb51D2e779EeEc9B239FFB0B2eC8262848f3E;
    address public constant ROUTER = 0xE11b93B61f6291d35c5a2beA0A9fF169080160cF;
    address public constant VELOCI_VOTER = 0xab9B68c9e53c94D7c0949FB909E80e4a29F9134A;
    string public constant PROTOCOL = 'Velocimeter';

    address public immutable VOTER;

    address public last_plugin;

    error PluginFactory__NotPair();
    error PluginFactory__InvalidGauge();

    event Plugin__PluginCreated(address plugin);

    constructor(address _VOTER) {
        VOTER = _VOTER;
    }

    function createPlugin(
        address _lpToken,
        address[] memory _gaugeRewards,
        string memory _symbol // ex sLP-USDT/USDC or vLP-DAI/ETH
    ) external returns (address) {
        if (!IRouter(ROUTER).isPair(_lpToken)) revert PluginFactory__NotPair();
        if (IVelociVoter(VELOCI_VOTER).gauges(_lpToken) == address(0)) revert PluginFactory__InvalidGauge();
        (address token0, address token1) = IVelociLP(_lpToken).tokens();

        address[] memory tokensInUnderlying = new address[](2);
        tokensInUnderlying[0] = token0;
        tokensInUnderlying[1] = token1;

        address[] memory _bribeTokens = new address[](_gaugeRewards.length);
        for (uint i = 0; i < _gaugeRewards.length; i++) {
            _bribeTokens[i] = (_gaugeRewards[i] == BVM ? OBVM : _gaugeRewards[i]);
        }

        VelociGaugePlugin lastPlugin = new VelociGaugePlugin(
            _lpToken,
            IVelociVoter(VELOCI_VOTER).gauges(_lpToken),
            address(this),
            tokensInUnderlying,
            _bribeTokens,
            _gaugeRewards,
            PROTOCOL,
            _symbol
        );
        last_plugin = address(lastPlugin);
        emit Plugin__PluginCreated(last_plugin);
        return last_plugin;
    }

    function setGaugeRewards(address _plugin, address[] memory _gaugeRewards) external onlyOwner {
        VelociGaugePlugin(_plugin).setGaugeRewards(_gaugeRewards);
    }
    
}

{
  "compilationTarget": {
    "contracts/plugins/base/VelociGaugePluginFactory.sol": "VelociGaugePlugin"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}