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// SPDX-License-Identifier: MIT
pragma solidity =0.8.24;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/security/Pausable.sol';
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';

/// @title LionVault Contract
/// @notice This contract manages staking, rewards distribution, and pool management for Lion Boost Tokens (LBoost).
/// @dev Inherits from ERC20 for token functionality, ReentrancyGuard for reentrancy protection,
/// Pausable for pausing functionality, and Ownable for access control.
contract LionVault is ERC20, ReentrancyGuard, Pausable, Ownable {
    using SafeERC20 for IERC20;
    using SafeERC20 for IERC20Metadata;

    // Struct to store information about each stake
    struct Stake {
        uint256 poolId; // ID of the pool where the stake is made
        uint256 amount; // Amount of tokens staked
        uint256 weightedAmount; // Weighted amount of the stake, used for rewards calculation
        uint256 stakeTimestamp; // Timestamp when the stake was made
        uint256 unlockTimestamp; // Timestamp when the stake can be unlocked
        bool active; // Status of the stake, whether it is active or not
    }

    // Struct to store information about each pool
    struct PoolInfo {
        uint256 multiplier; // Multiplier for the pool, used for rewards calculation
        uint256 lockPeriod; // Lock period for the pool, during which stakes cannot be withdrawn
        uint256 totalAmount; // Total amount of tokens staked in the pool
    }

    // Struct to store information about each user
    struct UserInfo {
        uint256 totalAmount; // Total amount of tokens staked by the user
        uint256 totalWeightedAmount; // Total weighted amount of the user's stakes, used for rewards calculation
        uint256 rewardDebt; // Reward debt of the user, used for rewards calculation
        uint256 totalClaimed; // Total amount of rewards claimed by the user
        Stake[] stakes; // Array of stakes made by the user
    }

    uint256 public immutable PRECISION;

    /// The reward token
    IERC20Metadata public immutable rewardToken;

    /// The staked token
    IERC20 public immutable stakeToken;

    /// Emission per second
    uint256 public rewardPerSecond;

    /// @notice Accumulated tokens per share, scaled by the precision factor.
    /// @dev This variable tracks the amount of reward tokens accumulated per share of the total weighted amount.
    /// It is used to calculate the pending rewards for each user based on their weighted stake.
    uint256 public accTokenPerShare;

    /// Emission starting timestamp
    uint256 public rewardStartTimestamp;

    /// Emission ending timestamp
    uint256 public rewardEndTimestamp;

    /// The timestamp of the last pool update
    uint256 public lastRewardTimeStamp;

    // Mapping to store user information
    mapping(address => UserInfo) public userInfo;

    // Mapping to store active pool information
    mapping(uint256 => mapping(uint256 => uint256)) public activePoolMap;

    PoolInfo[] public poolInfo;

    // Events for logging important actions
    event Deposit(
        address indexed user,
        uint256 indexed pid,
        uint256 indexed stakeId,
        uint256 amount,
        uint256 weightedAmount,
        uint256 unlockTimestamp
    );
    event Withdraw(address indexed user, uint256 indexed stakeId, uint256 amount, uint256 weightedAmount);
    event Upgrade(
        address indexed user,
        uint256 indexed stakeId,
        uint256 indexed newPid,
        uint256 newWeightedAmount,
        uint256 newUnlockTimestamp
    );
    event AddPool(uint256 indexed poolId, uint256 multiplier, uint256 lockPeriod);
    event SetPool(uint256 indexed poolId, uint256 multiplier, uint256 lockPeriod);
    event SetRewardPerSecond(uint256 rewardPerSecond);
    event SetRewardStartTimestamp(uint256 rewardStartTimestamp);
    event SetRewardEndTimestamp(uint256 rewardEndTimestamp);

    // Custom errors for more efficient error handling
    error InvalidRewardTokenDecimal();
    error InvalidPid();
    error ZeroAddress();
    error InvalidTimestamp();
    error LengthMismatch();
    error TooEarly();
    error InvalidStake();
    error LongerPeriod();
    error HigherMultiplier();
    error VaultHasStarted();
    error DuplicatePool();
    error InvalidMultiplier();
    error NonTransferable();

    constructor(
        IERC20 _stakeToken,
        IERC20Metadata _rewardToken,
        uint256 _rewardPerSecond,
        uint256 _rewardStartTimestamp,
        uint256 _rewardEndTimestamp
    ) ERC20('Lion Boost Token', 'LBoost') {
        if (address(_stakeToken) == address(0) || address(_rewardToken) == address(0)) revert ZeroAddress();
        if (_rewardStartTimestamp >= _rewardEndTimestamp) revert InvalidTimestamp();

        stakeToken = _stakeToken;
        rewardToken = _rewardToken;
        rewardPerSecond = _rewardPerSecond;
        rewardStartTimestamp = _rewardStartTimestamp;
        rewardEndTimestamp = _rewardEndTimestamp;

        uint256 rewardTokenDecimals = uint256(rewardToken.decimals());
        if (rewardTokenDecimals >= 36) revert InvalidRewardTokenDecimal();
        PRECISION = 10 ** (36 - rewardTokenDecimals);

        lastRewardTimeStamp = block.timestamp > rewardStartTimestamp ? block.timestamp : rewardStartTimestamp;
    }

    /**
     * @notice Allows a user to deposit a specified amount of tokens into a pool.
     * @dev This function can only be called when the contract is not paused and is protected against reentrancy.
     * @param _pid The ID of the pool into which the tokens are being deposited.
     * @param _amount The amount of tokens to deposit.
     *
     * Requirements:
     * - The pool must exist and have a valid multiplier.
     * - The user must have approved the contract to spend at least `_amount` of the staked token.
     *
     * Effects:
     * - Updates the user's stake and pool information.
     * - Transfers the specified amount of tokens from the user to the contract.
     * - Mints new Lion Boost Tokens (LBoost) to the user based on the pool's multiplier.
     * - Emits a `Deposit` event.
     */
    function deposit(uint256 _pid, uint256 _amount) external whenNotPaused nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        if (pool.multiplier == 0) revert InvalidPid();

        _harvest();

        UserInfo storage user = userInfo[msg.sender];
        if (user.totalWeightedAmount > 0) {
            uint256 pending = (user.totalWeightedAmount * accTokenPerShare) / PRECISION - user.rewardDebt;
            if (pending > 0) {
                user.totalClaimed += pending;
                rewardToken.safeTransfer(msg.sender, pending);
            }
        }

        if (_amount > 0) {
            uint256 weightedAmount = pool.multiplier * _amount;
            Stake memory stake;
            stake.amount = _amount;
            stake.poolId = _pid;
            stake.weightedAmount = weightedAmount;
            stake.stakeTimestamp = block.timestamp;
            stake.unlockTimestamp = block.timestamp + pool.lockPeriod;
            stake.active = true;

            user.stakes.push(stake);
            user.totalAmount += _amount;
            user.totalWeightedAmount += weightedAmount;
            pool.totalAmount += _amount;

            stakeToken.safeTransferFrom(msg.sender, address(this), _amount);
            _mint(msg.sender, weightedAmount);

            emit Deposit(
                msg.sender,
                _pid,
                user.stakes.length - 1,
                _amount,
                stake.weightedAmount,
                stake.unlockTimestamp
            );
        }

        user.rewardDebt = (user.totalWeightedAmount * accTokenPerShare) / PRECISION;
    }

    /**
     * @notice Allows a user to withdraw their staked tokens from a specific stake.
     * @dev This function can only be called when the contract is not paused and is protected against reentrancy.
     * @param _stakeId The ID of the stake to withdraw from.
     *
     * Requirements:
     * - The stake must be active and the unlock timestamp must have passed.
     *
     * Effects:
     * - Transfers the staked tokens back to the user.
     * - Burns the corresponding Lion Boost Tokens (LBoost).
     * - Updates the user's stake and pool information.
     * - Emits a `Withdraw` event.
     */
    function withdraw(uint256 _stakeId) public whenNotPaused nonReentrant {
        UserInfo storage user = userInfo[msg.sender];
        Stake storage stake = user.stakes[_stakeId];
        PoolInfo storage pool = poolInfo[stake.poolId];
        if (block.timestamp < stake.unlockTimestamp) revert TooEarly();
        if (!stake.active) revert InvalidStake();

        _harvest();

        if (user.totalWeightedAmount > 0) {
            uint256 pending = (user.totalWeightedAmount * accTokenPerShare) / PRECISION - user.rewardDebt;
            if (pending > 0) {
                user.totalClaimed += pending;
                rewardToken.safeTransfer(msg.sender, pending);
            }
        }

        user.totalAmount -= stake.amount;
        user.totalWeightedAmount -= stake.weightedAmount;
        pool.totalAmount -= stake.amount;
        stake.active = false;

        stakeToken.safeTransfer(msg.sender, stake.amount);
        _burn(msg.sender, stake.weightedAmount);

        user.rewardDebt = (user.totalWeightedAmount * accTokenPerShare) / PRECISION;
        emit Withdraw(msg.sender, _stakeId, stake.amount, stake.weightedAmount);
    }

    /**
     * @notice Allows a user to upgrade their stake to a new pool with potentially different parameters.
     * @dev This function can only be called when the contract is not paused and is protected against reentrancy.
     * @param _stakeId The ID of the stake to upgrade.
     * @param _newPid The ID of the new pool to which the stake is being upgraded.
     *
     * Requirements:
     * - The stake must be active.
     * - The new pool's lock period must not be shorter than the remaining lock period of the current stake.
     * - The new pool's multiplier must be at least equal to the current stake's weighted amount per token.
     *
     * Effects:
     * - Updates the stake's pool ID and unlock timestamp.
     * - Adjusts the user's total weighted amount and mints additional Lion Boost Tokens (LBoost) if necessary.
     * - Updates the total amount in the old and new pools.
     * - Emits an `Upgrade` event.
     */
    function upgrade(uint256 _stakeId, uint256 _newPid) public whenNotPaused nonReentrant {
        UserInfo storage user = userInfo[msg.sender];
        Stake storage stake = user.stakes[_stakeId];
        PoolInfo storage oldPool = poolInfo[stake.poolId];
        PoolInfo storage newPool = poolInfo[_newPid];
        if (!stake.active) revert InvalidStake();
        if (stake.stakeTimestamp + newPool.lockPeriod < stake.unlockTimestamp) revert LongerPeriod();
        if (newPool.multiplier < stake.weightedAmount / stake.amount) revert HigherMultiplier();

        _harvest();
        if (user.totalWeightedAmount > 0) {
            uint256 pending = (user.totalWeightedAmount * accTokenPerShare) / PRECISION - user.rewardDebt;
            if (pending > 0) {
                user.totalClaimed += pending;
                rewardToken.safeTransfer(msg.sender, pending);
            }
        }
        oldPool.totalAmount -= stake.amount;

        stake.poolId = _newPid;
        stake.unlockTimestamp = stake.stakeTimestamp + newPool.lockPeriod;

        uint256 upgradeAmount = newPool.multiplier * stake.amount - stake.weightedAmount;
        user.totalWeightedAmount += upgradeAmount;
        stake.weightedAmount += upgradeAmount;
        _mint(msg.sender, upgradeAmount);

        newPool.totalAmount += stake.amount;
        user.rewardDebt = (user.totalWeightedAmount * accTokenPerShare) / PRECISION;
        emit Upgrade(msg.sender, _stakeId, _newPid, stake.weightedAmount, stake.unlockTimestamp);
    }

    function batchWithdraw(uint256[] calldata _stakeIds) external {
        for (uint256 i; i < _stakeIds.length; i++) {
            withdraw(_stakeIds[i]);
        }
    }

    function batchUpgrade(uint256[] calldata _stakeIds, uint256[] calldata _newPids) external {
        if (_stakeIds.length != _newPids.length) revert LengthMismatch();
        for (uint256 i; i < _stakeIds.length; i++) {
            upgrade(_stakeIds[i], _newPids[i]);
        }
    }

    /**
     * @notice Internal function to distribute pending rewards to the vault.
     * @dev Updates the accumulated token per share and the last reward timestamp.
     *
     * Effects:
     * - Calculates the reward multiplier based on the time elapsed since the last update.
     * - Computes the total reward to be distributed and updates the accumulated token per share.
     * - Updates the last reward timestamp to the current block timestamp.
     *
     * Requirements:
     * - The function does nothing if the current timestamp is not greater than the last reward timestamp.
     * - If the total supply of the vault is zero, only updates the last reward timestamp.
     */
    function _harvest() internal {
        if (block.timestamp <= lastRewardTimeStamp) {
            return;
        }
        uint256 total = totalSupply();
        if (total == 0) {
            lastRewardTimeStamp = block.timestamp;
            return;
        }

        uint256 multiplier = _getMultiplier(lastRewardTimeStamp, block.timestamp);
        uint256 reward = multiplier * rewardPerSecond;
        accTokenPerShare += (reward * PRECISION) / total;
        lastRewardTimeStamp = block.timestamp;
    }

    /**
     * @notice Adds a new pool with specified parameters.
     * @dev Can only be called by the contract owner.
     * @param _multiplier The multiplier for the pool, used to calculate weighted amounts.
     * @param _lockPeriod The lock period for the pool in seconds.
     *
     * Requirements:
     * - The pool with the given multiplier and lock period must not already exist.
     * - The multiplier must be greater than zero.
     *
     * Effects:
     * - Creates a new pool and adds it to the list of pools.
     * - Updates the active pool mapping to include the new pool.
     * - Emits an `AddPool` event.
     */
    function add(uint256 _multiplier, uint256 _lockPeriod) public onlyOwner {
        if (activePoolMap[_multiplier][_lockPeriod] != 0) revert DuplicatePool();
        if (_multiplier == 0) revert InvalidMultiplier();
        poolInfo.push(PoolInfo({multiplier: _multiplier, lockPeriod: _lockPeriod, totalAmount: 0}));
        activePoolMap[_multiplier][_lockPeriod] = poolInfo.length;
        emit AddPool(poolInfo.length - 1, _multiplier, _lockPeriod);
    }

    /**
     * @notice Updates the parameters of an existing pool.
     * @dev Can only be called by the contract owner.
     * @param _pid The ID of the pool to update.
     * @param _multiplier The new multiplier for the pool.
     * @param _lockPeriod The new lock period for the pool in seconds.
     *
     * Requirements:
     * - The pool with the given multiplier and lock period must not already exist.
     * - The multiplier must be greater than zero.
     *
     * Effects:
     * - Updates the pool's multiplier and lock period.
     * - Adjusts the active pool mapping to reflect the changes.
     * - Emits a `SetPool` event.
     */
    function set(uint256 _pid, uint256 _multiplier, uint256 _lockPeriod) public onlyOwner {
        if (activePoolMap[_multiplier][_lockPeriod] != 0) revert DuplicatePool();
        if (_multiplier == 0) revert InvalidMultiplier();
        _harvest();

        PoolInfo storage pool = poolInfo[_pid];
        activePoolMap[pool.multiplier][pool.lockPeriod] = 0;
        pool.multiplier = _multiplier;
        pool.lockPeriod = _lockPeriod;
        activePoolMap[_multiplier][_lockPeriod] = _pid + 1;

        emit SetPool(_pid, _multiplier, _lockPeriod);
    }

    function _getMultiplier(uint256 _lastRewardTime, uint256 _currentTimestamp) internal view returns (uint256) {
        // Scenario 1: Not started yet
        if (block.timestamp < rewardStartTimestamp) {
            return 0;
        }
        // Scenario 2: Reward started and not ended. (on-going)
        if (_currentTimestamp <= rewardEndTimestamp) {
            return _currentTimestamp - _lastRewardTime;
        }
        // Scenario 3: pool's last reward already over rewardEndTimestamp
        if (_lastRewardTime >= rewardEndTimestamp) {
            return 0;
        }
        // Scenario 4: reward ended, calculate the diff from last claim
        return rewardEndTimestamp - _lastRewardTime;
    }

    /**
     * @notice Sets the reward per second to be distributed. Can only be called by the owner.
     * @param _rewardPerSecond The amount of reward token to be distributed per second.
     */
    function setRewardPerSecond(uint256 _rewardPerSecond) public onlyOwner {
        _harvest();
        rewardPerSecond = _rewardPerSecond;
        emit SetRewardPerSecond(_rewardPerSecond);
    }

    /**
     * @notice Sets the reward start timestamp. Can only be called by the owner.
     * @param _rewardStartTimestamp The timestamp when the reward starts.
     * @custom:throws VaultHasStarted if the vault has already started.
     * @custom:throws InvalidTimestamp if the reward start timestamp is invalid.
     */
    function setRewardStartTimestamp(uint256 _rewardStartTimestamp) public onlyOwner {
        if (block.timestamp > rewardStartTimestamp) revert VaultHasStarted();
        if (block.timestamp > _rewardStartTimestamp || _rewardStartTimestamp > rewardEndTimestamp)
            revert InvalidTimestamp();
        rewardStartTimestamp = _rewardStartTimestamp;
        emit SetRewardStartTimestamp(_rewardStartTimestamp);
    }

    /**
     * @notice Sets the reward end timestamp. Can only be called by the owner.
     * @param _rewardEndTimestamp The timestamp when the reward ends.
     * @custom:throws InvalidTimestamp if the reward end timestamp is invalid.
     */
    function setRewardEndTimestamp(uint256 _rewardEndTimestamp) public onlyOwner {
        if (block.timestamp > _rewardEndTimestamp || rewardStartTimestamp > _rewardEndTimestamp)
            revert InvalidTimestamp();

        _harvest();
        rewardEndTimestamp = _rewardEndTimestamp;
        emit SetRewardEndTimestamp(_rewardEndTimestamp);
    }

    function getUserInfo(address _user) external view returns (uint256, uint256, uint256, uint256, Stake[] memory) {
        UserInfo memory user = userInfo[_user];
        return (user.totalAmount, user.totalWeightedAmount, user.totalClaimed, user.rewardDebt, user.stakes);
    }

    /**
     * @dev Just in case there are too many Stakes and jams `getUserInfo`
     */
    function getUserStake(address _user, uint256 _stakeId) external view returns (Stake memory) {
        return userInfo[_user].stakes[_stakeId];
    }

    /**
     * @notice Calculates the pending reward for a user.
     * @dev This function provides a view of the rewards that a user can claim.
     * @param _user The address of the user for whom to calculate the pending reward.
     * @return The amount of reward tokens that are pending for the user.
     *
     * Effects:
     * - Computes the pending accumulated token per share if the current timestamp is greater than the last reward timestamp.
     * - Calculates the pending reward based on the user's total weighted amount and reward debt.
     */
    function pendingReward(address _user) external view returns (uint256) {
        UserInfo memory user = userInfo[_user];
        uint256 pendingAccTokenPerShare = accTokenPerShare;
        if (block.timestamp > lastRewardTimeStamp && totalSupply() != 0) {
            uint256 multiplier = _getMultiplier(lastRewardTimeStamp, block.timestamp);
            uint256 reward = multiplier * rewardPerSecond;
            pendingAccTokenPerShare += (reward * PRECISION) / totalSupply();
        }
        return (user.totalWeightedAmount * pendingAccTokenPerShare) / PRECISION - user.rewardDebt;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    /**
     * @dev BOOST Token is currently non-transferable
     */
    function _beforeTokenTransfer(address _from, address _to, uint256) internal pure override {
        if (_from != address(0) && _to != address(0)) revert NonTransferable();
    }

    /**
     * @notice Pause contract
     *
     * Requirements:
     * - The contract should not be paused before calling this function
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @notice Unpause contract
     *
     * Requirements:
     * - The contract should be paused before calling this function
     */
    function unpause() external onlyOwner {
        _unpause();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 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 {
        _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
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// 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 (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// 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);
        }
    }
}

// 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;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 3000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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IERC20Metadata","name":"_rewardToken","type":"address"},{"internalType":"uint256","name":"_rewardPerSecond","type":"uint256"},{"internalType":"uint256","name":"_rewardStartTimestamp","type":"uint256"},{"internalType":"uint256","name":"_rewardEndTimestamp","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"DuplicatePool","type":"error"},{"inputs":[],"name":"HigherMultiplier","type":"error"},{"inputs":[],"name":"InvalidMultiplier","type":"error"},{"inputs":[],"name":"InvalidPid","type":"error"},{"inputs":[],"name":"InvalidRewardTokenDecimal","type":"error"},{"inputs":[],"name":"InvalidStake","type":"error"},{"inputs":[],"name":"InvalidTimestamp","type":"error"},{"inputs":[],"name":"LengthMismatch","type":"error"},{"inputs":[],"name":"LongerPeriod","type":"error"},{"inputs":[],"name":"NonTransferable","type":"error"},{"inputs":[],"name":"TooEarly","type":"error"},{"inputs":[],"name":"VaultHasStarted","type":"error"},{"inputs":[],"name":"ZeroAddress","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"multiplier","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"lockPeriod","type":"uint256"}],"name":"AddPool","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"pid","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"stakeId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"weightedAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"unlockTimestamp","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"multiplier","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"lockPeriod","type":"uint256"}],"name":"SetPool","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"rewardEndTimestamp","type":"uint256"}],"name":"SetRewardEndTimestamp","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"rewardPerSecond","type":"uint256"}],"name":"SetRewardPerSecond","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"rewardStartTimestamp","type":"uint256"}],"name":"SetRewardStartTimestamp","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"stakeId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"newPid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newWeightedAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newUnlockTimestamp","type":"uint256"}],"name":"Upgrade","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"stakeId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"weightedAmount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"PRECISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"accTokenPerShare","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"activePoolMap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_multiplier","type":"uint256"},{"internalType":"uint256","name":"_lockPeriod","type":"uint256"}],"name":"add","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_stakeIds","type":"uint256[]"},{"internalType":"uint256[]","name":"_newPids","type":"uint256[]"}],"name":"batchUpgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_stakeIds","type":"uint256[]"}],"name":"batchWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"getUserInfo","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"components":[{"internalType":"uint256","name":"poolId","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"weightedAmount","type":"uint256"},{"internalType":"uint256","name":"stakeTimestamp","type":"uint256"},{"internalType":"uint256","name":"unlockTimestamp","type":"uint256"},{"internalType":"bool","name":"active","type":"bool"}],"internalType":"struct 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IERC20Metadata","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_multiplier","type":"uint256"},{"internalType":"uint256","name":"_lockPeriod","type":"uint256"}],"name":"set","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_rewardEndTimestamp","type":"uint256"}],"name":"setRewardEndTimestamp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_rewardPerSecond","type":"uint256"}],"name":"setRewardPerSecond","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_rewardStartTimestamp","type":"uint256"}],"name":"setRewardStartTimestamp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakeToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_stakeId","type":"uint256"},{"internalType":"uint256","name":"_newPid","type":"uint256"}],"name":"upgrade","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userInfo","outputs":[{"internalType":"uint256","name":"totalAmount","type":"uint256"},{"internalType":"uint256","name":"totalWeightedAmount","type":"uint256"},{"internalType":"uint256","name":"rewardDebt","type":"uint256"},{"internalType":"uint256","name":"totalClaimed","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_stakeId","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000009d8c68f185a04314ddc8b8216732455e8dbb7e450000000000000000000000009d8c68f185a04314ddc8b8216732455e8dbb7e45000000000000000000000000000000000000000000000000593bf2eeb1c300000000000000000000000000000000000000000000000000000000000067c599c000000000000000000000000000000000000000000000000000000000712cecc0

-----Decoded View---------------
Arg [0] : _stakeToken (address): 0x9D8c68F185A04314DDC8B8216732455e8dbb7E45
Arg [1] : _rewardToken (address): 0x9D8c68F185A04314DDC8B8216732455e8dbb7E45
Arg [2] : _rewardPerSecond (uint256): 6430000000000000000
Arg [3] : _rewardStartTimestamp (uint256): 1741003200
Arg [4] : _rewardEndTimestamp (uint256): 1898769600

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000009d8c68f185a04314ddc8b8216732455e8dbb7e45
Arg [1] : 0000000000000000000000009d8c68f185a04314ddc8b8216732455e8dbb7e45
Arg [2] : 000000000000000000000000000000000000000000000000593bf2eeb1c30000
Arg [3] : 0000000000000000000000000000000000000000000000000000000067c599c0
Arg [4] : 00000000000000000000000000000000000000000000000000000000712cecc0