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// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.19;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "../interface/IsVEC.sol";
import "../interface/IDistributor.sol";

/// @title   VECStaking
/// @notice  VEC Staking
contract VECStaking is Ownable {
    /// EVENTS ///

    event DistributorSet(address distributor);
    event Stake(address indexed from, address indexed to, uint256 amount);
    event Unstake(address indexed from, address indexed to, uint256 amount);
    event EpochTriggerd(uint256 newEpoch);

    /// DATA STRUCTURES ///

    struct Epoch {
        uint256 length; // in seconds
        uint256 number; // since inception
        uint256 end; // timestamp
        uint256 distribute; // amount
    }

    /// STATE VARIABLES ///

    /// @notice VEC address
    IERC20 public immutable VEC;
    /// @notice sVEC address
    IsVEC public immutable sVEC;

    /// @notice Current epoch details
    Epoch public epoch;

    /// @notice Distributor address
    IDistributor public distributor;

    /// CONSTRUCTOR ///

    /// @param _VEC                    Address of VEC
    /// @param _sVEC                   Address of sVEC
    /// @param _epochLength            Epoch length
    /// @param _secondsTillFirstEpoch  Seconds till first epoch starts
    constructor(
        address _VEC,
        address _sVEC,
        uint256 _epochLength,
        uint256 _secondsTillFirstEpoch
    ) {
        VEC = IERC20(_VEC);
        sVEC = IsVEC(_sVEC);

        epoch = Epoch({
            length: _epochLength,
            number: 0,
            end: block.timestamp + _secondsTillFirstEpoch,
            distribute: 0
        });
    }

    /// MUTATIVE FUNCTIONS ///

    /// @notice stake VEC
    /// @param _to address
    /// @param _amount uint
    function stake(address _to, uint256 _amount) external {
        rebase();
        VEC.transferFrom(msg.sender, address(this), _amount);
        sVEC.transfer(_to, _amount);
        emit Stake(msg.sender, _to, _amount);
    }

    /// @notice redeem sVEC for VEC
    /// @param _to address
    /// @param _amount uint
    function unstake(address _to, uint256 _amount, bool _rebase) external {
        if (_rebase) rebase();
        sVEC.transferFrom(msg.sender, address(this), _amount);
        require(
            _amount <= VEC.balanceOf(address(this)),
            "Insufficient VEC balance in contract"
        );
        VEC.transfer(_to, _amount);
        emit Unstake(msg.sender, _to, _amount);
    }

    ///@notice Trigger rebase if epoch over
    function rebase() public {
        if (epoch.end <= block.timestamp) {
            sVEC.rebase(epoch.distribute, epoch.number);

            epoch.end = epoch.end + epoch.length;
            epoch.number++;

            if (address(distributor) != address(0)) {
                distributor.distribute();
            }

            uint256 balance = VEC.balanceOf(address(this));
            uint256 staked = sVEC.circulatingSupply();

            if (balance <= staked) {
                epoch.distribute = 0;
            } else {
                epoch.distribute = balance - staked;
            }
            emit EpochTriggerd(epoch.number);
        }
    }

    /// VIEW FUNCTIONS ///

    /// @notice         Returns the sVEC index, which tracks rebase growth
    /// @return index_  Index of sVEC
    function index() public view returns (uint256 index_) {
        return sVEC.index();
    }

    /// @notice           Returns econds until the next epoch begins
    /// @return seconds_  Till next epoch
    function secondsToNextEpoch() external view returns (uint256 seconds_) {
        return epoch.end > block.timestamp ? epoch.end - block.timestamp : 0;
    }

    /// MANAGERIAL FUNCTIONS ///

    /// @notice              Sets the contract address for staking
    /// @param _distributor  Distributor Address
    function setDistributor(address _distributor) external onlyOwner {
        distributor = IDistributor(_distributor);
        emit DistributorSet(_distributor);
    }
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.19;

interface IDistributor {
    function distribute() external;

    function nextRewardAt(uint256 _rate) external view returns (uint256);

    function nextVECReward() external view returns (uint256);
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.19;

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

interface IsVEC is IERC20 {
    function rebase(uint256 amount_, uint epoch_) external returns (uint256);

    function circulatingSupply() external view returns (uint256);

    function gonsForBalance(uint amount) external view returns (uint);

    function balanceForGons(uint gons) external view returns (uint);

    function index() external view returns (uint);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_VEC","type":"address"},{"internalType":"address","name":"_sVEC","type":"address"},{"internalType":"uint256","name":"_epochLength","type":"uint256"},{"internalType":"uint256","name":"_secondsTillFirstEpoch","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"distributor","type":"address"}],"name":"DistributorSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"newEpoch","type":"uint256"}],"name":"EpochTriggerd","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":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Stake","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":"amount","type":"uint256"}],"name":"Unstake","type":"event"},{"inputs":[],"name":"VEC","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"distributor","outputs":[{"internalType":"contract IDistributor","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"epoch","outputs":[{"internalType":"uint256","name":"length","type":"uint256"},{"internalType":"uint256","name":"number","type":"uint256"},{"internalType":"uint256","name":"end","type":"uint256"},{"internalType":"uint256","name":"distribute","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"index","outputs":[{"internalType":"uint256","name":"index_","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rebase","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"sVEC","outputs":[{"internalType":"contract IsVEC","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"secondsToNextEpoch","outputs":[{"internalType":"uint256","name":"seconds_","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_distributor","type":"address"}],"name":"setDistributor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bool","name":"_rebase","type":"bool"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000001bb9b64927e0c5e207c9db4093b3738eef5d844700000000000000000000000066d5c66e7c83e0682d947176534242c9f19b336500000000000000000000000000000000000000000000000000000000000070800000000000000000000000000000000000000000000000000000000000015180

-----Decoded View---------------
Arg [0] : _VEC (address): 0x1BB9b64927e0C5e207C9DB4093b3738Eef5D8447
Arg [1] : _sVEC (address): 0x66d5c66E7C83E0682d947176534242c9f19b3365
Arg [2] : _epochLength (uint256): 28800
Arg [3] : _secondsTillFirstEpoch (uint256): 86400

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000001bb9b64927e0c5e207c9db4093b3738eef5d8447
Arg [1] : 00000000000000000000000066d5c66e7c83e0682d947176534242c9f19b3365
Arg [2] : 0000000000000000000000000000000000000000000000000000000000007080
Arg [3] : 0000000000000000000000000000000000000000000000000000000000015180