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// SPDX-License-Identifier: MIT

/**
 *   ==============================
 *              ve69LP
 *   ==============================
 *    Voting-Escrow Token Standard
 *   ==============================
 *
 * // "Lee, this is America. We don't care about your 'rich cultural heritage'!" - Carter
 * // https://x.com/sonicreddragon
 * // https://t.me/sonicreddragon
 */

pragma solidity ^0.8.9;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";

/**
 * @title ve69LP
 * @dev Vote-Escrowed 69/31 LP token implementation
 * Users lock 69/31 LP tokens for a period of time to receive voting power
 * The voting power depends on the amount of tokens locked and the lock time
 * Follows the veCRV model from Curve Finance
 */
contract ve69LP is Ownable, ReentrancyGuard {
    // Structs
    struct LockedBalance {
        uint256 amount;       // Amount of 69/31 LP tokens locked
        uint256 unlockTime;   // Unix timestamp when tokens unlock
    }
    
    struct Point {
        uint256 bias;         // Voting power at the time of recording
        uint256 slope;        // How fast the voting power is decreasing over time
        uint256 timestamp;    // Time point was recorded
    }
    
    // Constants
    uint256 private constant WEEK = 7 * 86400;             // 1 week in seconds
    uint256 private constant MAX_LOCK_TIME = 4 * 365 * 86400; // 4 years in seconds
    uint256 private constant MIN_LOCK_TIME = 7 * 86400;    // 1 week in seconds
    
    // State variables
    IERC20 public lpToken;    // 69/31 LP token
    uint256 public totalSupply;       // Total ve69LP supply
    mapping(address => LockedBalance) public locked;
    mapping(address => uint256) public userPointEpoch;
    mapping(address => mapping(uint256 => Point)) public userPointHistory;
    mapping(uint256 => Point) public pointHistory;
    
    uint256 public epoch;
    
    // Events
    event Deposit(address indexed provider, uint256 value, uint256 locktime, uint256 timestamp);
    event Withdraw(address indexed provider, uint256 value, uint256 timestamp);
    event Supply(uint256 prevSupply, uint256 supply);
    event LpTokenUpdated(address indexed newLpToken);
    
    /**
     * @dev Constructor
     * @param _lpToken Address of the 69/31 LP token
     */
    constructor(address _lpToken) {
        require(_lpToken != address(0), "LP token address cannot be zero");
        lpToken = IERC20(_lpToken);
        
        pointHistory[0] = Point({
            bias: 0,
            slope: 0,
            timestamp: block.timestamp
        });
        epoch = 0;
    }
    
    /**
     * @dev Get the voting power of a user
     * @param _user Address of the user
     * @return User's current voting power
     */
    function balanceOf(address _user) external view returns (uint256) {
        LockedBalance memory userLock = locked[_user];
        return calculateVotingPower(userLock.amount, userLock.unlockTime);
    }
    
    /**
     * @dev Get the total voting power
     * @return Total current voting power
     */
    function totalVotingPower() external view returns (uint256) {
        return totalSupply;
    }
    
    /**
     * @dev Create a new lock or add to an existing lock
     * @param _value Amount of 69/31 LP to lock
     * @param _unlockTime Future time when tokens unlock
     */
    function createLock(uint256 _value, uint256 _unlockTime) external nonReentrant {
        require(_value > 0, "Must lock non-zero amount");
        require(_unlockTime > block.timestamp, "Lock time must be in the future");
        require(_unlockTime >= block.timestamp + MIN_LOCK_TIME, "Lock time must be at least 1 week");
        require(_unlockTime <= block.timestamp + MAX_LOCK_TIME, "Lock time too long");

        LockedBalance storage userLock = locked[msg.sender];
        require(userLock.amount == 0, "Lock already exists");

        // Transfer tokens to contract
        require(lpToken.transferFrom(msg.sender, address(this), _value), "Transfer failed");

        // Update locked balance
        userLock.amount = _value;
        userLock.unlockTime = _unlockTime;

        // Calculate voting power
        uint256 votingPower = calculateVotingPower(_value, _unlockTime);

        // Update total supply
        uint256 prevSupply = totalSupply;
        totalSupply = prevSupply + votingPower;

        // Update user point history
        userPointEpoch[msg.sender] += 1;
        uint256 userEpoch = userPointEpoch[msg.sender];
        userPointHistory[msg.sender][userEpoch] = Point({
            bias: votingPower,
            slope: votingPower / (_unlockTime - block.timestamp),
            timestamp: block.timestamp
        });

        // Update global point history
        epoch += 1;
        pointHistory[epoch] = Point({
            bias: totalSupply,
            slope: pointHistory[epoch - 1].slope + (votingPower / (_unlockTime - block.timestamp)),
            timestamp: block.timestamp
        });

        emit Deposit(msg.sender, _value, _unlockTime, block.timestamp);
        emit Supply(prevSupply, totalSupply);
    }
    
    /**
     * @dev Increase lock amount without changing the unlock time
     * @param _value Additional amount of 69/31 LP to lock
     */
    function increaseLockAmount(uint256 _value) external nonReentrant {
        LockedBalance storage userLocked = locked[msg.sender];
        
        require(_value > 0, "Must increase by non-zero amount");
        require(userLocked.amount > 0, "No existing lock found");
        require(userLocked.unlockTime > block.timestamp, "Lock expired");
        
        // Checkpoint with new amount but same unlock time
        _checkpoint(msg.sender, userLocked, LockedBalance({
            amount: userLocked.amount + _value,
            unlockTime: userLocked.unlockTime
        }));
        
        // Update user's lock
        userLocked.amount += _value;
        
        // Transfer LP tokens from user to contract
        require(lpToken.transferFrom(msg.sender, address(this), _value), "Transfer failed");
        
        emit Deposit(msg.sender, _value, userLocked.unlockTime, block.timestamp);
    }
    
    /**
     * @dev Extend lock time without changing the amount
     * @param _unlockTime New unlock time
     */
    function extendLockTime(uint256 _unlockTime) external nonReentrant {
        LockedBalance storage userLock = locked[msg.sender];
        require(userLock.amount > 0, "No existing lock found");
        require(_unlockTime > userLock.unlockTime, "Cannot decrease lock time");
        require(_unlockTime <= block.timestamp + MAX_LOCK_TIME, "Lock time too long");
        require(_unlockTime >= block.timestamp + MIN_LOCK_TIME, "Lock time must be in the future");

        // Calculate old voting power
        uint256 oldVotingPower = calculateVotingPower(userLock.amount, userLock.unlockTime);

        // Update unlock time
        userLock.unlockTime = _unlockTime;

        // Calculate new voting power
        uint256 newVotingPower = calculateVotingPower(userLock.amount, _unlockTime);

        // Update user point history
        userPointEpoch[msg.sender] += 1;
        uint256 userEpoch = userPointEpoch[msg.sender];
        userPointHistory[msg.sender][userEpoch] = Point({
            bias: newVotingPower,
            slope: 0,
            timestamp: block.timestamp
        });

        // Update total supply
        totalSupply = totalSupply - oldVotingPower + newVotingPower;

        // Update global point history
        epoch += 1;
        pointHistory[epoch] = Point({
            bias: totalSupply,
            slope: 0,
            timestamp: block.timestamp
        });

        emit Deposit(msg.sender, userLock.amount, _unlockTime, block.timestamp);
    }
    
    /**
     * @dev Withdraw tokens once the lock has expired
     */
    function withdraw() external nonReentrant {
        LockedBalance storage userLock = locked[msg.sender];
        require(userLock.amount > 0, "No lock found");
        require(block.timestamp >= userLock.unlockTime, "Lock not expired");

        // Save the amount to withdraw
        uint256 amount = userLock.amount;

        // Clear the lock before any external calls
        userLock.amount = 0;
        userLock.unlockTime = 0;

        // Update total supply (voting power should already be 0 since lock expired)
        uint256 oldVotingPower = calculateVotingPower(amount, userLock.unlockTime);
        if (oldVotingPower > 0) {
            totalSupply = totalSupply > oldVotingPower ? totalSupply - oldVotingPower : 0;
        }

        // Update user point history
        userPointEpoch[msg.sender] += 1;
        uint256 userEpoch = userPointEpoch[msg.sender];
        userPointHistory[msg.sender][userEpoch] = Point({
            bias: 0,
            slope: 0,
            timestamp: block.timestamp
        });

        // Update global point history
        epoch += 1;
        pointHistory[epoch] = Point({
            bias: totalSupply,
            slope: 0,
            timestamp: block.timestamp
        });

        // Transfer tokens back to user
        require(lpToken.transfer(msg.sender, amount), "Transfer failed");

        emit Withdraw(msg.sender, amount, block.timestamp);
        emit Supply(totalSupply + oldVotingPower, totalSupply);
    }
    
    /**
     * @dev Get lock information for a user
     * @param _user Address of the user
     * @return amount Amount of locked LP tokens
     * @return unlockTime Timestamp when tokens unlock
     */
    function getLock(address _user) external view returns (uint256 amount, uint256 unlockTime) {
        LockedBalance memory userLocked = locked[_user];
        return (userLocked.amount, userLocked.unlockTime);
    }
    
    /**
     * @dev Calculate voting power based on amount and lock time
     * @param _amount Amount of LP tokens locked
     * @param _unlockTime Time when tokens unlock
     * @return Voting power
     */
    function calculateVotingPower(uint256 _amount, uint256 _unlockTime) public view returns (uint256) {
        if (_amount == 0 || _unlockTime <= block.timestamp) {
            return 0;
        }
        
        uint256 timeDiff = _unlockTime - block.timestamp;
        if (timeDiff > MAX_LOCK_TIME) {
            timeDiff = MAX_LOCK_TIME;
        }
        
        // Calculate voting power with improved precision
        // Use 1e18 precision throughout the calculation
        uint256 timeRatio = (timeDiff * 1e18) / MAX_LOCK_TIME;
        uint256 votingPower = (_amount * timeRatio) / 1e18;
        
        return votingPower;
    }
    
    /**
     * @dev Internal function to update user points and total supply
     * @param _user User address
     * @param _oldLocked Old locked balance
     * @param _newLocked New locked balance
     */
    function _checkpoint(address _user, LockedBalance memory _oldLocked, LockedBalance memory _newLocked) internal {
        Point memory userOldPoint;
        Point memory userNewPoint;
        
        // Calculate old and new voting power
        uint256 oldPower = calculateVotingPower(_oldLocked.amount, _oldLocked.unlockTime);
        uint256 newPower = calculateVotingPower(_newLocked.amount, _newLocked.unlockTime);
        
        // Update user point epoch and save history
        userPointEpoch[_user] += 1;
        uint256 userEpoch = userPointEpoch[_user];
        
        // Calculate slope and bias with improved precision
        uint256 oldSlope = 0;
        uint256 newSlope = 0;
        
        if (_oldLocked.unlockTime > block.timestamp) {
            uint256 timeDiff = _oldLocked.unlockTime - block.timestamp;
            if (timeDiff > MAX_LOCK_TIME) {
                timeDiff = MAX_LOCK_TIME;
            }
            // Calculate slope with 1e18 precision
            oldSlope = (_oldLocked.amount * 1e18) / timeDiff;
        }
        
        if (_newLocked.unlockTime > block.timestamp) {
            uint256 timeDiff = _newLocked.unlockTime - block.timestamp;
            if (timeDiff > MAX_LOCK_TIME) {
                timeDiff = MAX_LOCK_TIME;
            }
            // Calculate slope with 1e18 precision
            newSlope = (_newLocked.amount * 1e18) / timeDiff;
        }
        
        // Update user point history with current timestamp
        userOldPoint.bias = oldPower;
        userOldPoint.slope = oldSlope;
        userOldPoint.timestamp = block.timestamp;
        
        userNewPoint.bias = newPower;
        userNewPoint.slope = newSlope;
        userNewPoint.timestamp = block.timestamp;
        
        // Save user point history
        userPointHistory[_user][userEpoch] = userNewPoint;
        
        // Update global point history
        epoch += 1;
        
        // Update global supply with proper overflow checks
        uint256 prevSupply = totalSupply;
        totalSupply = prevSupply + newPower - oldPower;
        
        // Update global point history with proper overflow checks
        Point memory lastPoint = pointHistory[epoch - 1];
        pointHistory[epoch] = Point({
            bias: lastPoint.bias + newPower - oldPower,
            slope: lastPoint.slope + newSlope - oldSlope,
            timestamp: block.timestamp
        });
        
        emit Supply(prevSupply, totalSupply);
    }
    
    /**
     * @dev Allows the owner to set the LP token address after deployment
     * This is useful for manual LP setup through Beets UI
     * @param _newLpToken Address of the new LP token
     */
    function setLpToken(address _newLpToken) external onlyOwner {
        require(_newLpToken != address(0), "LP token address cannot be zero");
        require(totalSupply == 0, "Cannot change LP token after locks have been created");
        
        // Update token address
        lpToken = IERC20(_newLpToken);
        
        // Emit event to log the change
        emit LpTokenUpdated(_newLpToken);
    }
}

// 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 v4.8.0) (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 v4.6.0) (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 v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_lpToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"provider","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"locktime","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newLpToken","type":"address"}],"name":"LpTokenUpdated","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":"uint256","name":"prevSupply","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"supply","type":"uint256"}],"name":"Supply","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"provider","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"_unlockTime","type":"uint256"}],"name":"calculateVotingPower","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_value","type":"uint256"},{"internalType":"uint256","name":"_unlockTime","type":"uint256"}],"name":"createLock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"epoch","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_unlockTime","type":"uint256"}],"name":"extendLockTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"getLock","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"unlockTime","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"increaseLockAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"locked","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"unlockTime","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lpToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"pointHistory","outputs":[{"internalType":"uint256","name":"bias","type":"uint256"},{"internalType":"uint256","name":"slope","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newLpToken","type":"address"}],"name":"setLpToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalVotingPower","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userPointEpoch","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userPointHistory","outputs":[{"internalType":"uint256","name":"bias","type":"uint256"},{"internalType":"uint256","name":"slope","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000fbd43f75e09bfbcdef8b95cefabf980311e6d62f

-----Decoded View---------------
Arg [0] : _lpToken (address): 0xfbd43F75e09bfBcDeF8B95CEfAbf980311E6d62F

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000fbd43f75e09bfbcdef8b95cefabf980311e6d62f