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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.13;

import './libraries/Math.sol';
import {Constants} from "./libraries/Constants.sol";
import './interfaces/IRewardsDistributor.sol';
import './interfaces/IVotingEscrow.sol';

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/*

@title Curve Fee Distribution modified for ve(3,3) emissions
@author Curve Finance, andrecronje
@license MIT

*/

contract RewardsDistributor is IRewardsDistributor {
    using SafeERC20 for IERC20;

    event CheckpointToken(
        uint time,
        uint tokens
    );

    event Claimed(
        uint tokenId,
        uint amount,
        uint claim_epoch,
        uint max_epoch
    );

    uint public start_time;
    uint public time_cursor;
    mapping(uint => uint) public time_cursor_of;
    mapping(uint => uint) public user_epoch_of;

    uint public last_token_time;
    uint[1000000000000000] public tokens_per_week;
    uint public token_last_balance;
    uint[1000000000000000] public ve_supply;

    address public owner;
    address public voting_escrow;
    address public token;
    address public depositor;

    constructor(address _voting_escrow) {
        uint _t = block.timestamp / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        start_time = _t;
        last_token_time = _t;
        time_cursor = _t;
        address _token = IVotingEscrow(_voting_escrow).token();
        token = _token;
        voting_escrow = _voting_escrow;
        depositor = msg.sender; //MinterUpgradeable
        owner = msg.sender;
        require(IERC20(_token).approve(_voting_escrow, type(uint).max));
    }

    function timestamp() external view returns (uint) {
        return block.timestamp / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
    }

    function _checkpoint_token() internal {
        uint token_balance = IERC20(token).balanceOf(address(this));
        uint to_distribute = token_balance - token_last_balance;
        token_last_balance = token_balance;

        uint t = last_token_time;
        uint since_last = block.timestamp - t;
        last_token_time = block.timestamp;
        uint this_week = t / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        uint next_week = 0;

        for (uint i = 0; i < 20; i++) {
            next_week = this_week + Constants.EPOCH_LENGTH;
            if (block.timestamp < next_week) {
                if (since_last == 0 && block.timestamp == t) {
                    tokens_per_week[this_week] += to_distribute;
                } else {
                    tokens_per_week[this_week] += to_distribute * (block.timestamp - t) / since_last;
                }
                break;
            } else {
                if (since_last == 0 && next_week == t) {
                    tokens_per_week[this_week] += to_distribute;
                } else {
                    tokens_per_week[this_week] += to_distribute * (next_week - t) / since_last;
                }
            }
            t = next_week;
            this_week = next_week;
        }
        emit CheckpointToken(block.timestamp, to_distribute);
    }

    function checkpoint_token() external {
        assert(msg.sender == depositor);
        _checkpoint_token();
    }

    function _find_timestamp_epoch(address ve, uint _timestamp) internal view returns (uint) {
        uint _min = 0;
        uint _max = IVotingEscrow(ve).epoch();
        for (uint i = 0; i < 128; i++) {
            if (_min >= _max) break;
            uint _mid = (_min + _max + 2) / 2;
            IVotingEscrow.Point memory pt = IVotingEscrow(ve).point_history(_mid);
            if (pt.ts <= _timestamp) {
                _min = _mid;
            } else {
                _max = _mid - 1;
            }
        }
        return _min;
    }

    function _find_timestamp_user_epoch(address ve, uint tokenId, uint _timestamp, uint max_user_epoch) internal view returns (uint) {
        uint _min = 0;
        uint _max = max_user_epoch;
        for (uint i = 0; i < 128; i++) {
            if (_min >= _max) break;
            uint _mid = (_min + _max + 2) / 2;
            IVotingEscrow.Point memory pt = IVotingEscrow(ve).user_point_history(tokenId, _mid);
            if (pt.ts <= _timestamp) {
                _min = _mid;
            } else {
                _max = _mid -1;
            }
        }
        return _min;
    }

    function ve_for_at(uint _tokenId, uint _timestamp) external view returns (uint) {
        address ve = voting_escrow;
        uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
        uint epoch = _find_timestamp_user_epoch(ve, _tokenId, _timestamp, max_user_epoch);
        IVotingEscrow.Point memory pt = IVotingEscrow(ve).user_point_history(_tokenId, epoch);
        return Math.max(uint(int256(pt.bias - pt.slope * (int128(int256(_timestamp - pt.ts))))), 0);
    }

    function _checkpoint_total_supply() internal {
        address ve = voting_escrow;
        uint t = time_cursor;
        uint rounded_timestamp = block.timestamp / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        IVotingEscrow(ve).checkpoint();

        for (uint i = 0; i < 20; i++) {
            if (t > rounded_timestamp) {
                break;
            } else {
                uint epoch = _find_timestamp_epoch(ve, t);
                IVotingEscrow.Point memory pt = IVotingEscrow(ve).point_history(epoch);
                int128 dt = 0;
                if (t > pt.ts) {
                    dt = int128(int256(t - pt.ts));
                }
                ve_supply[t] = Math.max(uint(int256(pt.bias - pt.slope * dt)), 0);
            }
            t += Constants.EPOCH_LENGTH;
        }
        time_cursor = t;
    }

    function checkpoint_total_supply() external {
        _checkpoint_total_supply();
    }

    function _claim(uint _tokenId, address ve, uint _last_token_time) internal returns (uint) {
        uint user_epoch = 0;
        uint to_distribute = 0;

        uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
        uint _start_time = start_time;

        if (max_user_epoch == 0) return 0;

        uint week_cursor = time_cursor_of[_tokenId];
        if (week_cursor == 0) {
            user_epoch = _find_timestamp_user_epoch(ve, _tokenId, _start_time, max_user_epoch);
        } else {
            user_epoch = user_epoch_of[_tokenId];
        }

        if (user_epoch == 0) user_epoch = 1;

        IVotingEscrow.Point memory user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);

        if (week_cursor == 0) week_cursor = (user_point.ts + Constants.EPOCH_LENGTH - 1) / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        if (week_cursor >= last_token_time) return 0;
        if (week_cursor < _start_time) week_cursor = _start_time;

        IVotingEscrow.Point memory old_user_point;

        for (uint i = 0; i < 50; i++) {
            if (week_cursor >= _last_token_time) break;

            if (week_cursor >= user_point.ts && user_epoch <= max_user_epoch) {
                user_epoch += 1;
                old_user_point = user_point;
                if (user_epoch > max_user_epoch) {
                    user_point = IVotingEscrow.Point(0,0,0,0);
                } else {
                    user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
                }
            } else {
                int128 dt = int128(int256(week_cursor - old_user_point.ts));
                uint balance_of = (old_user_point.bias - dt * old_user_point.slope) < 0 ? 0 : uint(int256(old_user_point.bias - dt * old_user_point.slope));
                if (balance_of == 0 && user_epoch > max_user_epoch) break;
                if (balance_of != 0) {
                    to_distribute += balance_of * tokens_per_week[week_cursor] / ve_supply[week_cursor];
                }
                week_cursor += Constants.EPOCH_LENGTH;
            }
        }

        user_epoch = Math.min(max_user_epoch, user_epoch - 1);
        user_epoch_of[_tokenId] = user_epoch;
        time_cursor_of[_tokenId] = week_cursor;

        emit Claimed(_tokenId, to_distribute, user_epoch, max_user_epoch);

        return to_distribute;
    }

    function _claimable(uint _tokenId, address ve, uint _last_token_time) internal view returns (uint) {
        uint user_epoch = 0;
        uint to_distribute = 0;

        uint max_user_epoch = IVotingEscrow(ve).user_point_epoch(_tokenId);
        uint _start_time = start_time;

        if (max_user_epoch == 0) return 0;

        uint week_cursor = time_cursor_of[_tokenId];
        if (week_cursor == 0) {
            user_epoch = _find_timestamp_user_epoch(ve, _tokenId, _start_time, max_user_epoch);
        } else {
            user_epoch = user_epoch_of[_tokenId];
        }

        if (user_epoch == 0) user_epoch = 1;

        IVotingEscrow.Point memory user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);

        if (week_cursor == 0) week_cursor = (user_point.ts + Constants.EPOCH_LENGTH - 1) / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        if (week_cursor >= last_token_time) return 0;
        if (week_cursor < _start_time) week_cursor = _start_time;

        IVotingEscrow.Point memory old_user_point;

        for (uint i = 0; i < 50; i++) {
            if (week_cursor >= _last_token_time) break;

            if (week_cursor >= user_point.ts && user_epoch <= max_user_epoch) {
                user_epoch += 1;
                old_user_point = user_point;
                if (user_epoch > max_user_epoch) {
                    user_point = IVotingEscrow.Point(0,0,0,0);
                } else {
                    user_point = IVotingEscrow(ve).user_point_history(_tokenId, user_epoch);
                }
            } else {
                int128 dt = int128(int256(week_cursor - old_user_point.ts));
                uint balance_of = (old_user_point.bias - dt * old_user_point.slope) < 0 ? 0 : uint(int256(old_user_point.bias - dt * old_user_point.slope));
                if (balance_of == 0 && user_epoch > max_user_epoch) break;
                if (balance_of != 0) {
                    to_distribute += balance_of * tokens_per_week[week_cursor] / ve_supply[week_cursor];
                }
                week_cursor += Constants.EPOCH_LENGTH;
            }
        }

        return to_distribute;
    }

    function claimable(uint _tokenId) external view returns (uint) {
        uint _last_token_time = last_token_time / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        return _claimable(_tokenId, voting_escrow, _last_token_time);
    }

    function claim(uint _tokenId) external returns (uint) {
        if (block.timestamp >= time_cursor) _checkpoint_total_supply();
        uint _last_token_time = last_token_time;
        _last_token_time = _last_token_time / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        uint amount = _claim(_tokenId, voting_escrow, _last_token_time);
        if (amount != 0) {
            // if locked.end then send directly
            IVotingEscrow.LockedBalance memory _locked = IVotingEscrow(voting_escrow).locked(_tokenId);
            if(_locked.end < block.timestamp){
                address _nftOwner = IVotingEscrow(voting_escrow).ownerOf(_tokenId);
                IERC20(token).safeTransfer(_nftOwner, amount);
            } else {
                IVotingEscrow(voting_escrow).deposit_for(_tokenId, amount);
            }
            token_last_balance -= amount;
        }
        return amount;
    }

    function claim_many(uint[] memory _tokenIds) external returns (bool) {
        if (block.timestamp >= time_cursor) _checkpoint_total_supply();
        uint _last_token_time = last_token_time;
        _last_token_time = _last_token_time / Constants.EPOCH_LENGTH * Constants.EPOCH_LENGTH;
        address _voting_escrow = voting_escrow;
        uint total = 0;

        for (uint i = 0; i < _tokenIds.length; i++) {
            uint _tokenId = _tokenIds[i];
            if (_tokenId == 0) break;
            uint amount = _claim(_tokenId, _voting_escrow, _last_token_time);
            if (amount != 0) {
                // if locked.end then send directly
                IVotingEscrow.LockedBalance memory _locked = IVotingEscrow(_voting_escrow).locked(_tokenId);
                if(_locked.end < block.timestamp){
                    address _nftOwner = IVotingEscrow(_voting_escrow).ownerOf(_tokenId);
                    IERC20(token).safeTransfer(_nftOwner, amount);
                } else {
                    IVotingEscrow(_voting_escrow).deposit_for(_tokenId, amount);
                }
                total += amount;
            }
        }
        if (total != 0) {
            token_last_balance -= total;
        }

        return true;
    }

    function setDepositor(address _depositor) external {
        require(msg.sender == owner);
        depositor = _depositor;
    }

    function setOwner(address _owner) external {
        require(msg.sender == owner);
        owner = _owner;
    }

    function withdrawERC20(address _token) external {
        require(msg.sender == owner);
        require(_token != address(0));
        uint256 _balance = IERC20(_token).balanceOf(address(this));
        IERC20(_token).safeTransfer(msg.sender, _balance);
    }


}

// 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 (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
pragma solidity 0.8.13;

interface IRewardsDistributor {
    function checkpoint_token() external;
    function voting_escrow() external view returns(address);
    function checkpoint_total_supply() external;
    function claimable(uint _tokenId) external view returns (uint);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

interface IVotingEscrow {

    struct Point {
        int128 bias;
        int128 slope; // # -dweight / dt
        uint256 ts;
        uint256 blk; // block
    }

    struct LockedBalance {
        int128 amount;
        uint start;
        uint end;
    }

    function create_lock_for(uint _value, uint _lock_duration, address _to) external returns (uint);

    function locked(uint id) external view returns(LockedBalance memory);
    function tokenOfOwnerByIndex(address _owner, uint _tokenIndex) external view returns (uint);

    function token() external view returns (address);
    function team() external returns (address);
    function epoch() external view returns (uint);
    function point_history(uint loc) external view returns (Point memory);
    function user_point_history(uint tokenId, uint loc) external view returns (Point memory);
    function user_point_epoch(uint tokenId) external view returns (uint);

    function ownerOf(uint) external view returns (address);
    function isApprovedOrOwner(address, uint) external view returns (bool);
    function transferFrom(address, address, uint) external;

    function voted(uint) external view returns (bool);
    function attachments(uint) external view returns (uint);
    function voting(uint tokenId) external;
    function abstain(uint tokenId) external;
    function attach(uint tokenId) external;
    function detach(uint tokenId) external;

    function checkpoint() external;
    function deposit_for(uint tokenId, uint value) external;

    function balanceOfAtNFT(uint _tokenId, uint _block) external view returns (uint);
    function balanceOfNFT(uint _id) external view returns (uint);
    function balanceOf(address _owner) external view returns (uint);
    function totalSupply() external view returns (uint);
    function supply() external view returns (uint);


    function decimals() external view returns(uint8);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

library Constants {
    uint256 internal constant EPOCH_LENGTH = 1 hours; // 7 days;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

library Math {
    function max(uint a, uint b) internal pure returns (uint) {
        return a >= b ? a : b;
    }
    function min(uint a, uint b) internal pure returns (uint) {
        return a < b ? a : b;
    }
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
    function cbrt(uint256 n) internal pure returns (uint256) { unchecked {
        uint256 x = 0;
        for (uint256 y = 1 << 255; y > 0; y >>= 3) {
            x <<= 1;
            uint256 z = 3 * x * (x + 1) + 1;
            if (n / y >= z) {
                n -= y * z;
                x += 1;
            }
        }
        return x;
    }}
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000329d9ca4fad82d10f128050535c138d3bd83e397

-----Decoded View---------------
Arg [0] : _voting_escrow (address): 0x329D9cA4FAd82D10f128050535c138D3bd83E397

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000329d9ca4fad82d10f128050535c138d3bd83e397