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Contract Name:
ComplexRewarderPerSecV2

Contract Source Code:

File 1 of 1 : ComplexRewarderPerSecV2

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


// File @openzeppelin/contracts/utils/[email protected]



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;
    }
}


// File @openzeppelin/contracts/access/[email protected]



pragma solidity ^0.8.0;

/**
 * @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() {
        _setOwner(_msgSender());
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


// File @openzeppelin/contracts/security/[email protected]



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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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


// File contracts/farms/v2/libraries/IBoringERC20.sol


pragma solidity ^0.8.7;

interface IBoringERC20 {
    function mint(address to, uint256 amount) external;

    function totalSupply() external view returns (uint256);

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

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    /// @notice EIP 2612
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}


// File contracts/farms/v2/rewarders/IComplexRewarder.sol


pragma solidity ^0.8.7;

interface IComplexRewarder {
    function onStellaReward(
        uint256 pid,
        address user,
        uint256 newLpAmount
    ) external;

    function pendingTokens(uint256 pid, address user)
        external
        view
        returns (uint256 pending);

    function rewardToken() external view returns (IBoringERC20);

    function poolRewardsPerSec(uint256 pid) external view returns (uint256);
}


// File contracts/farms/v2/IStellaDistributorV2.sol


pragma solidity ^0.8.2;

interface IStellaDistributorV2 {
    function totalAllocPoint() external view returns (uint256);

    function deposit(uint256 _pid, uint256 _amount) external;

    function poolLength() external view returns (uint256);

    function poolTotalLp(uint256 pid) external view returns (uint256);
}


// File contracts/farms/v2/libraries/BoringERC20.sol


pragma solidity ^0.8.7;

// solhint-disable avoid-low-level-calls

library BoringERC20 {
    bytes4 private constant SIG_SYMBOL = 0x95d89b41; // symbol()
    bytes4 private constant SIG_NAME = 0x06fdde03; // name()
    bytes4 private constant SIG_DECIMALS = 0x313ce567; // decimals()
    bytes4 private constant SIG_TRANSFER = 0xa9059cbb; // transfer(address,uint256)
    bytes4 private constant SIG_TRANSFER_FROM = 0x23b872dd; // transferFrom(address,address,uint256)

    function returnDataToString(bytes memory data)
        internal
        pure
        returns (string memory)
    {
        if (data.length >= 64) {
            return abi.decode(data, (string));
        } else if (data.length == 32) {
            uint8 i = 0;
            while (i < 32 && data[i] != 0) {
                i++;
            }
            bytes memory bytesArray = new bytes(i);
            for (i = 0; i < 32 && data[i] != 0; i++) {
                bytesArray[i] = data[i];
            }
            return string(bytesArray);
        } else {
            return "???";
        }
    }

    /// @notice Provides a safe ERC20.symbol version which returns '???' as fallback string.
    /// @param token The address of the ERC-20 token contract.
    /// @return (string) Token symbol.
    function safeSymbol(IBoringERC20 token)
        internal
        view
        returns (string memory)
    {
        (bool success, bytes memory data) = address(token).staticcall(
            abi.encodeWithSelector(SIG_SYMBOL)
        );
        return success ? returnDataToString(data) : "???";
    }

    /// @notice Provides a safe ERC20.name version which returns '???' as fallback string.
    /// @param token The address of the ERC-20 token contract.
    /// @return (string) Token name.
    function safeName(IBoringERC20 token)
        internal
        view
        returns (string memory)
    {
        (bool success, bytes memory data) = address(token).staticcall(
            abi.encodeWithSelector(SIG_NAME)
        );
        return success ? returnDataToString(data) : "???";
    }

    /// @notice Provides a safe ERC20.decimals version which returns '18' as fallback value.
    /// @param token The address of the ERC-20 token contract.
    /// @return (uint8) Token decimals.
    function safeDecimals(IBoringERC20 token) internal view returns (uint8) {
        (bool success, bytes memory data) = address(token).staticcall(
            abi.encodeWithSelector(SIG_DECIMALS)
        );
        return success && data.length == 32 ? abi.decode(data, (uint8)) : 18;
    }

    /// @notice Provides a safe ERC20.transfer version for different ERC-20 implementations.
    /// Reverts on a failed transfer.
    /// @param token The address of the ERC-20 token.
    /// @param to Transfer tokens to.
    /// @param amount The token amount.
    function safeTransfer(
        IBoringERC20 token,
        address to,
        uint256 amount
    ) internal {
        (bool success, bytes memory data) = address(token).call(
            abi.encodeWithSelector(SIG_TRANSFER, to, amount)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "BoringERC20: Transfer failed"
        );
    }

    /// @notice Provides a safe ERC20.transferFrom version for different ERC-20 implementations.
    /// Reverts on a failed transfer.
    /// @param token The address of the ERC-20 token.
    /// @param from Transfer tokens from.
    /// @param to Transfer tokens to.
    /// @param amount The token amount.
    function safeTransferFrom(
        IBoringERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        (bool success, bytes memory data) = address(token).call(
            abi.encodeWithSelector(SIG_TRANSFER_FROM, from, to, amount)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "BoringERC20: TransferFrom failed"
        );
    }
}


// File contracts/farms/v2/rewarders/ComplexRewarderPerSecV2.sol


pragma solidity ^0.8.2;
pragma experimental ABIEncoderV2;






/**
 * This is a sample contract to be used in the StellaDistributorV2 contract for partners to reward
 * stakers with their native token alongside STELLA.
 *
 * It assumes no minting rights, so requires a set amount of YOUR_TOKEN to be transferred to this contract prior.
 * E.g. say you've allocated 100,000 XYZ to the STELLA-XYZ farm over 30 days. Then you would need to transfer
 * 100,000 XYZ and set the block reward accordingly so it's fully distributed after 30 days.
 */
contract ComplexRewarderPerSecV2 is IComplexRewarder, Ownable, ReentrancyGuard {
    using BoringERC20 for IBoringERC20;

    IBoringERC20 public immutable override rewardToken;
    IStellaDistributorV2 public immutable distributorV2;
    bool public immutable isNative;

    /// @notice Info of each distributorV2 user.
    /// `amount` LP token amount the user has provided.
    /// `rewardDebt` The amount of REWARD entitled to the user.
    struct UserInfo {
        uint256 amount;
        uint256 rewardDebt;
    }

    /// @notice Info of each distributorV2 poolInfo.
    /// `accTokenPerShare` Amount of REWARD each LP token is worth.
    /// `startTimestamp` The start timestamp of rewards.
    /// `lastRewardTimestamp` The last timestamp REWARD was rewarded to the poolInfo.
    /// `allocPoint` The amount of allocation points assigned to the pool.
    /// `totalRewards` The amount of rewards added to the pool.
    struct PoolInfo {
        uint256 accTokenPerShare;
        uint256 startTimestamp;
        uint256 lastRewardTimestamp;
        uint256 allocPoint;
        uint256 totalRewards;
    }

    /// @notice Reward info
    /// `startTimestamp` The start timestamp of rewards
    /// `endTimestamp` The end timestamp of rewards
    /// `rewardPerSec` The amount of rewards per second
    struct RewardInfo {
        uint256 startTimestamp;
        uint256 endTimestamp;
        uint256 rewardPerSec;
    }

    /// @notice Info of each pool.
    mapping(uint256 => PoolInfo) public poolInfo;

    /// @dev this is mostly used for extending reward period
    /// @notice Reward info is a set of {endTimestamp, rewardPerSec}
    /// indexed by pool id
    mapping(uint256 => RewardInfo[]) public poolRewardInfo;

    uint256[] public poolIds;

    /// @notice Info of each user that stakes LP tokens.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;

    /// @dev Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;

    /// @notice limit length of reward info
    /// how many phases are allowed
    uint256 public immutable rewardInfoLimit = 52; //1y

    // The precision factor
    uint256 private immutable ACC_TOKEN_PRECISION;

    event OnReward(address indexed user, uint256 amount);
    event RewardRateUpdated(uint256 oldRate, uint256 newRate);
    event AddPool(uint256 indexed pid, uint256 allocPoint);
    event SetPool(uint256 indexed pid, uint256 allocPoint);
    event UpdatePool(
        uint256 indexed pid,
        uint256 lastRewardTimestamp,
        uint256 lpSupply,
        uint256 accTokenPerShare
    );

    event AddRewardInfo(
        uint256 indexed pid,
        uint256 indexed phase,
        uint256 endTimestamp,
        uint256 rewardPerSec
    );

    modifier onlyDistributorV2() {
        require(
            msg.sender == address(distributorV2),
            "onlyDistributorV2: only StellaDistributorV2 can call this function"
        );
        _;
    }

    constructor(
        IBoringERC20 _rewardToken,
        IStellaDistributorV2 _distributorV2,
        bool _isNative
    ) {
        require(
            Address.isContract(address(_rewardToken)),
            "constructor: reward token must be a valid contract"
        );
        require(
            Address.isContract(address(_distributorV2)),
            "constructor: StellaDistributorV2 must be a valid contract"
        );
        rewardToken = _rewardToken;
        distributorV2 = _distributorV2;
        isNative = _isNative;

        uint256 decimalsRewardToken = uint256(
            _isNative ? 18 : _rewardToken.safeDecimals()
        );
        require(
            decimalsRewardToken < 30,
            "constructor: reward token decimals must be inferior to 30"
        );

        ACC_TOKEN_PRECISION = uint256(
            10**(uint256(30) - (decimalsRewardToken))
        );
    }

    /// @notice Add a new pool. Can only be called by the owner.
    /// @param _pid pool id on DistributorV2
    /// @param _allocPoint allocation of the new pool.
    function add(
        uint256 _pid,
        uint256 _allocPoint,
        uint256 _startTimestamp
    ) public onlyOwner {
        require(poolInfo[_pid].lastRewardTimestamp == 0, "pool already exists");
        totalAllocPoint += _allocPoint;

        poolInfo[_pid] = PoolInfo({
            allocPoint: _allocPoint,
            startTimestamp: _startTimestamp,
            lastRewardTimestamp: _startTimestamp,
            accTokenPerShare: 0,
            totalRewards: 0
        });

        poolIds.push(_pid);
        emit AddPool(_pid, _allocPoint);
    }

    /// @notice if the new reward info is added, the reward & its end timestamp will be extended by the newly pushed reward info.
    function addRewardInfo(
        uint256 _pid,
        uint256 _endTimestamp,
        uint256 _rewardPerSec
    ) external payable onlyOwner {
        RewardInfo[] storage rewardInfo = poolRewardInfo[_pid];
        PoolInfo storage pool = poolInfo[_pid];
        require(
            rewardInfo.length < rewardInfoLimit,
            "add reward info: reward info length exceeds the limit"
        );
        require(
            rewardInfo.length == 0 ||
                rewardInfo[rewardInfo.length - 1].endTimestamp >=
                block.timestamp,
            "add reward info: reward period ended"
        );
        require(
            rewardInfo.length == 0 ||
                rewardInfo[rewardInfo.length - 1].endTimestamp < _endTimestamp,
            "add reward info: bad new endTimestamp"
        );

        uint256 startTimestamp = rewardInfo.length == 0
            ? pool.startTimestamp
            : rewardInfo[rewardInfo.length - 1].endTimestamp;

        uint256 timeRange = _endTimestamp - startTimestamp;
        uint256 totalRewards = timeRange * _rewardPerSec;

        if (!isNative) {
            rewardToken.safeTransferFrom(
                msg.sender,
                address(this),
                totalRewards
            );
        } else {
            require(
                msg.value >= totalRewards,
                "add reward info: not enough funds to transfer"
            );
        }

        pool.totalRewards += totalRewards;

        rewardInfo.push(
            RewardInfo({
                startTimestamp: startTimestamp,
                endTimestamp: _endTimestamp,
                rewardPerSec: _rewardPerSec
            })
        );

        emit AddRewardInfo(
            _pid,
            rewardInfo.length - 1,
            _endTimestamp,
            _rewardPerSec
        );
    }

    function _endTimestampOf(uint256 _pid, uint256 _timestamp)
        internal
        view
        returns (uint256)
    {
        RewardInfo[] memory rewardInfo = poolRewardInfo[_pid];
        uint256 len = rewardInfo.length;
        if (len == 0) {
            return 0;
        }
        for (uint256 i = 0; i < len; ++i) {
            if (_timestamp <= rewardInfo[i].endTimestamp)
                return rewardInfo[i].endTimestamp;
        }

        /// @dev when couldn't find any reward info, it means that _timestamp exceed endTimestamp
        /// so return the latest reward info.
        return rewardInfo[len - 1].endTimestamp;
    }

    /// @notice this will return end timestamp based on the current block timestamp.
    function currentEndTimestamp(uint256 _pid) external view returns (uint256) {
        return _endTimestampOf(_pid, block.timestamp);
    }

    /// @notice Return reward multiplier over the given _from to _to timestamp.
    function _getTimeElapsed(
        uint256 _from,
        uint256 _to,
        uint256 _endTimestamp
    ) public pure returns (uint256) {
        if ((_from >= _endTimestamp) || (_from > _to)) {
            return 0;
        }
        if (_to <= _endTimestamp) {
            return _to - _from;
        }
        return _endTimestamp - _from;
    }

    /// @notice Update reward variables of the given pool.
    /// @param _pid The index of the pool. See `poolInfo`.
    /// @return pool Returns the pool that was updated.
    function updatePool(uint256 _pid)
        external
        nonReentrant
        returns (PoolInfo memory pool)
    {
        return _updatePool(_pid);
    }

    /// @notice Update reward variables of the given pool.
    /// @param pid The index of the pool. See `poolInfo`.
    /// @return pool Returns the pool that was updated.
    function _updatePool(uint256 pid) public returns (PoolInfo memory pool) {
        pool = poolInfo[pid];
        RewardInfo[] memory rewardInfo = poolRewardInfo[pid];

        if (block.timestamp <= pool.lastRewardTimestamp) {
            return pool;
        }

        uint256 lpSupply = distributorV2.poolTotalLp(pid);

        if (lpSupply == 0) {
            // if there is no total supply, return and use the pool's start timestamp as the last reward timestamp
            // so that ALL reward will be distributed.
            // however, if the first deposit is out of reward period, last reward timestamp will be its timestamp
            // in order to keep the multiplier = 0
            if (block.timestamp > _endTimestampOf(pid, block.timestamp)) {
                pool.lastRewardTimestamp = block.timestamp;
                emit UpdatePool(
                    pid,
                    pool.lastRewardTimestamp,
                    lpSupply,
                    pool.accTokenPerShare
                );
            }

            return pool;
        }

        /// @dev for each reward info
        for (uint256 i = 0; i < rewardInfo.length; ++i) {
            // @dev get multiplier based on current timestamp and rewardInfo's end timestamp
            // multiplier will be a range of either (current timestamp - pool.timestamp)
            // or (reward info's endtimestamp - pool.timestamp) or 0
            uint256 timeElapsed = _getTimeElapsed(
                pool.lastRewardTimestamp,
                block.timestamp,
                rewardInfo[i].endTimestamp
            );
            if (timeElapsed == 0) continue;

            // @dev if currentTimestamp exceed end timestamp, use end timestamp as the last reward timestamp
            // so that for the next iteration, previous endTimestamp will be used as the last reward timestamp
            if (block.timestamp > rewardInfo[i].endTimestamp) {
                pool.lastRewardTimestamp = rewardInfo[i].endTimestamp;
            } else {
                pool.lastRewardTimestamp = block.timestamp;
            }

            uint256 tokenReward = (timeElapsed *
                rewardInfo[i].rewardPerSec *
                pool.allocPoint) / totalAllocPoint;

            pool.accTokenPerShare += ((tokenReward * ACC_TOKEN_PRECISION) /
                lpSupply);
        }

        poolInfo[pid] = pool;

        emit UpdatePool(
            pid,
            pool.lastRewardTimestamp,
            lpSupply,
            pool.accTokenPerShare
        );

        return pool;
    }

    // Update reward vairables for all pools. Be careful of gas spending!
    function massUpdatePools() public nonReentrant {
        _massUpdatePools();
    }

    // Update reward vairables for all pools. Be careful of gas spending!
    function _massUpdatePools() internal {
        uint256 length = poolIds.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            _updatePool(poolIds[pid]);
        }
    }

    /// @notice Function called by StellaDistributorV2 whenever staker claims STELLA harvest. Allows staker to also receive a 2nd reward token.
    /// @param _user Address of user
    /// @param _amount Number of LP tokens the user has
    function onStellaReward(
        uint256 _pid,
        address _user,
        uint256 _amount
    ) external override onlyDistributorV2 nonReentrant {
        PoolInfo memory pool = _updatePool(_pid);
        UserInfo storage user = userInfo[_pid][_user];

        uint256 pending = 0;
        uint256 rewardBalance = 0;

        if (isNative) {
            rewardBalance = address(this).balance;
        } else {
            rewardBalance = rewardToken.balanceOf(address(this));
        }

        if (user.amount > 0) {
            pending = (((user.amount * pool.accTokenPerShare) /
                ACC_TOKEN_PRECISION) - user.rewardDebt);

            if (pending > 0) {
                if (isNative) {
                    if (pending > rewardBalance) {
                        (bool success, ) = _user.call{value: rewardBalance}("");
                        require(success, "Transfer failed");
                    } else {
                        (bool success, ) = _user.call{value: pending}("");
                        require(success, "Transfer failed");
                    }
                } else {
                    if (pending > rewardBalance) {
                        rewardToken.safeTransfer(_user, rewardBalance);
                    } else {
                        rewardToken.safeTransfer(_user, pending);
                    }
                }
            }
        }

        user.amount = _amount;

        user.rewardDebt =
            (user.amount * pool.accTokenPerShare) /
            ACC_TOKEN_PRECISION;

        emit OnReward(_user, pending);
    }

    /// @notice View function to see pending Reward on frontend.
    function pendingTokens(uint256 _pid, address _user)
        external
        view
        override
        returns (uint256)
    {
        return
            _pendingTokens(
                _pid,
                userInfo[_pid][_user].amount,
                userInfo[_pid][_user].rewardDebt
            );
    }

    function _pendingTokens(
        uint256 _pid,
        uint256 _amount,
        uint256 _rewardDebt
    ) internal view returns (uint256 pending) {
        PoolInfo memory pool = poolInfo[_pid];
        RewardInfo[] memory rewardInfo = poolRewardInfo[_pid];

        uint256 accTokenPerShare = pool.accTokenPerShare;
        uint256 lpSupply = distributorV2.poolTotalLp(_pid);

        if (block.timestamp > pool.lastRewardTimestamp && lpSupply != 0) {
            uint256 cursor = pool.lastRewardTimestamp;

            for (uint256 i = 0; i < rewardInfo.length; ++i) {
                uint256 timeElapsed = _getTimeElapsed(
                    cursor,
                    block.timestamp,
                    rewardInfo[i].endTimestamp
                );
                if (timeElapsed == 0) continue;
                cursor = rewardInfo[i].endTimestamp;

                uint256 tokenReward = (timeElapsed *
                    rewardInfo[i].rewardPerSec *
                    pool.allocPoint) / totalAllocPoint;

                accTokenPerShare +=
                    (tokenReward * ACC_TOKEN_PRECISION) /
                    lpSupply;
            }
        }

        pending = (((_amount * accTokenPerShare) / ACC_TOKEN_PRECISION) -
            _rewardDebt);
    }

    function _rewardPerSecOf(uint256 _pid, uint256 _blockTimestamp)
        internal
        view
        returns (uint256)
    {
        RewardInfo[] memory rewardInfo = poolRewardInfo[_pid];
        PoolInfo storage pool = poolInfo[_pid];
        uint256 len = rewardInfo.length;
        if (len == 0) {
            return 0;
        }
        for (uint256 i = 0; i < len; ++i) {
            if (_blockTimestamp <= rewardInfo[i].endTimestamp)
                return
                    (rewardInfo[i].rewardPerSec * pool.allocPoint) /
                    totalAllocPoint;
        }
        /// @dev when couldn't find any reward info, it means that timestamp exceed endblock
        /// so return 0
        return 0;
    }

    /// @notice View function to see pool rewards per sec
    function poolRewardsPerSec(uint256 _pid)
        external
        view
        override
        returns (uint256)
    {
        return _rewardPerSecOf(_pid, block.timestamp);
    }

    /// @notice Withdraw reward. EMERGENCY ONLY.
    function emergencyRewardWithdraw(
        uint256 _pid,
        uint256 _amount,
        address _beneficiary
    ) external onlyOwner nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        uint256 lpSupply = distributorV2.poolTotalLp(_pid);

        uint256 currentStakingPendingReward = _pendingTokens(_pid, lpSupply, 0);

        require(
            currentStakingPendingReward + _amount <= pool.totalRewards,
            "emergency reward withdraw: not enough reward token"
        );
        pool.totalRewards -= _amount;

        if (!isNative) {
            rewardToken.safeTransfer(_beneficiary, _amount);
        } else {
            (bool sent, ) = _beneficiary.call{value: _amount}("");
            require(sent, "emergency reward withdraw: failed to send");
        }
    }

    // INCASE SOMETHING WRONG HAPPENS
    uint256 public stuckTimeLock = 0;
    function inCaseTokensGetStuck(address _token, uint256 _amount) external onlyOwner {
        if (stuckTimeLock == 0) {
            stuckTimeLock = block.timestamp + 86400;
        } 

        if(stuckTimeLock <= block.timestamp) {
            if (!isNative) {
                IBoringERC20(_token).safeTransfer(msg.sender, _amount);
            } else {
                (bool sent, ) = msg.sender.call{value: _amount}("");
                require(sent, "emergency reward withdraw: failed to send");
            }
            stuckTimeLock = 0;
        }
    }
}

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