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

import "../libraries/Math.sol";
import "../interfaces/IERC20.sol";
import "../interfaces/IRewardsDistributor.sol";
import "../interfaces/IVersionable.sol";
import {IVotingEscrowV2} from "./VotingEscrow/IVotingEscrowV2.sol";
import {Checkpoints} from "./VotingEscrow/libraries/Checkpoints.sol";
import "../Constants.sol";

/**
@title RewardsDistributor for ve(3,3) emissions
@author RewardsDistributor V2 ApeGuru
@author RewardsDistributor V1 Curve Finance, andrecronje

@dev
- WARN If a user burns an expired VotingEscrowV2 NFT before claiming rewards, they will lose the unclaimed rewards.
*/
contract RewardsDistributorV2 is IRewardsDistributor, IVersionable {
    event CheckpointToken(uint time, uint tokens);

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

    string public constant override VERSION = "2.1.0";

    uint immutable WEEK = Constants.EPOCH;

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

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

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

    constructor(address _voting_escrow) {
        uint _t = (block.timestamp / WEEK) * WEEK;
        start_time = _t;
        last_token_time = _t;
        time_cursor = _t;
        address _token = address(IVotingEscrowV2(_voting_escrow).token());
        token = _token;
        voting_escrow = _voting_escrow;
        depositor = msg.sender;
        owner = msg.sender;
        require(IERC20(_token).approve(_voting_escrow, type(uint).max));
    }

    function timestamp() public view returns (uint) {
        return (block.timestamp / WEEK) * WEEK;
    }

    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 / WEEK) * WEEK;
        uint next_week = 0;

        for (uint i = 0; i < 20; i++) {
            next_week = this_week + WEEK;
            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 _checkpoint_total_supply() internal {
        IVotingEscrowV2(voting_escrow).checkpoint();
        if (block.timestamp >= time_cursor) time_cursor = timestamp() + WEEK;
    }

    function checkpoint_total_supply() external {
        _checkpoint_total_supply();
    }

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

        (, uint48 maxTs) = IVotingEscrowV2(ve).getPastEscrowPoint(_tokenId, block.timestamp);
        uint _start_time = start_time;

        if (maxTs == 0) return 0;

        uint week_cursor = time_cursor_of[_tokenId];

        if (week_cursor == 0) {
            (, uint48 ts) = IVotingEscrowV2(ve).getFirstEscrowPoint(_tokenId);
            week_cursor = ((ts + WEEK - 1) / WEEK) * WEEK;
        }
        if (week_cursor >= last_token_time) return 0;
        if (week_cursor < _start_time) week_cursor = _start_time;

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

            uint256 balance_of = IVotingEscrowV2(ve).balanceOfNFTAt(_tokenId, week_cursor);
            if (balance_of == 0) continue;
            if (balance_of != 0) {
                /// @note potential brick if supply returns 0
                to_distribute +=
                    (balance_of * tokens_per_week[week_cursor]) /
                    IVotingEscrowV2(ve).getPastTotalSupply(week_cursor);
            }
            week_cursor += WEEK;
        }

        time_cursor_of[_tokenId] = week_cursor;

        emit Claimed(_tokenId, to_distribute, week_cursor, maxTs);

        return to_distribute;
    }

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

        uint _start_time = start_time;

        uint week_cursor = time_cursor_of[_tokenId];

        if (week_cursor == 0) {
            (, uint48 ts) = IVotingEscrowV2(ve).getFirstEscrowPoint(_tokenId);
            if (ts == 0) return 0;
            week_cursor = ((ts + WEEK - 1) / WEEK) * WEEK;
        }

        if (week_cursor >= last_token_time) return 0;
        if (week_cursor < _start_time) week_cursor = _start_time;

        for (uint i = 0; i < 50; i++) {
            if (week_cursor >= _last_token_time) break;
            uint256 balance_of = IVotingEscrowV2(ve).balanceOfNFTAt(_tokenId, week_cursor);
            if (balance_of == 0) break;
            if (balance_of != 0) {
                /// @note potential brick if supply returns 0
                to_distribute +=
                    (balance_of * tokens_per_week[week_cursor]) /
                    uint256(int256(IVotingEscrowV2(ve).getPastTotalSupply(week_cursor)));
            }
            week_cursor += WEEK;
        }

        return to_distribute;
    }

    function claimable(uint _tokenId) external view returns (uint) {
        uint _last_token_time = (last_token_time / WEEK) * WEEK;
        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 / WEEK) * WEEK;
        uint amount = _claim(_tokenId, voting_escrow, _last_token_time);
        if (amount != 0) {
            // if locked.end then send directly
            IVotingEscrowV2.LockDetails memory _locked = IVotingEscrowV2(voting_escrow).lockDetails(_tokenId);
            if (_locked.endTime <= block.timestamp && !_locked.isPermanent) {
                address _nftOwner = IVotingEscrowV2(voting_escrow).ownerOf(_tokenId);
                IERC20(token).transfer(_nftOwner, amount);
            } else {
                IVotingEscrowV2(voting_escrow).increaseAmount(_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 / WEEK) * WEEK;
        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
                IVotingEscrowV2.LockDetails memory _locked = IVotingEscrowV2(_voting_escrow).lockDetails(_tokenId);
                if (_locked.endTime < block.timestamp && !_locked.isPermanent) {
                    address _nftOwner = IVotingEscrowV2(_voting_escrow).ownerOf(_tokenId);
                    IERC20(token).transfer(_nftOwner, amount);
                } else {
                    IVotingEscrowV2(_voting_escrow).increaseAmount(_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).transfer(msg.sender, _balance);
    }
}

// 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 IERC20Upgradeable {
    /**
     * @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 v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 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 256, 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 << 3) < value ? 1 : 0);
        }
    }
}

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

library Constants {
    uint48 constant EPOCH = 1 weeks;
}

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

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function transfer(address recipient, uint amount) external returns (bool);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function balanceOf(address) external view returns (uint);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);

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

// 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 ^0.8.0;

interface IVersionable {
    function VERSION() external view returns (string memory);
}

// 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;
    }}
    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'Math: Sub-underflow');
    }
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.0;
import "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
/**
 * @title Non-Fungible Vesting Token Standard.
 * @notice A non-fungible token standard used to vest ERC-20 tokens over a vesting release curve
 *  scheduled using timestamps.
 * @dev Because this standard relies on timestamps for the vesting schedule, it's important to keep track of the
 *  tokens claimed per Vesting NFT so that a user cannot withdraw more tokens than allotted for a specific Vesting NFT.
 * @custom:interface-id 0xbd3a202b
 */
interface IERC5725Upgradeable is IERC721Upgradeable {
    /**
     *  This event is emitted when the payout is claimed through the claim function.
     *  @param tokenId the NFT tokenId of the assets being claimed.
     *  @param recipient The address which is receiving the payout.
     *  @param claimAmount The amount of tokens being claimed.
     */
    event PayoutClaimed(uint256 indexed tokenId, address indexed recipient, uint256 claimAmount);

    /**
     *  This event is emitted when an `owner` sets an address to manage token claims for all tokens.
     *  @param owner The address setting a manager to manage all tokens.
     *  @param spender The address being permitted to manage all tokens.
     *  @param approved A boolean indicating whether the spender is approved to claim for all tokens.
     */
    event ClaimApprovalForAll(address indexed owner, address indexed spender, bool approved);

    /**
     *  This event is emitted when an `owner` sets an address to manage token claims for a `tokenId`.
     *  @param owner The `owner` of `tokenId`.
     *  @param spender The address being permitted to manage a tokenId.
     *  @param tokenId The unique identifier of the token being managed.
     *  @param approved A boolean indicating whether the spender is approved to claim for `tokenId`.
     */
    event ClaimApproval(address indexed owner, address indexed spender, uint256 indexed tokenId, bool approved);

    /**
     * @notice Claim the pending payout for the NFT.
     * @dev MUST grant the claimablePayout value at the time of claim being called to `msg.sender`.
     *  MUST revert if not called by the token owner or approved users.
     *  MUST emit PayoutClaimed.
     *  SHOULD revert if there is nothing to claim.
     * @param tokenId The NFT token id.
     */
    function claim(uint256 tokenId) external;

    /**
     * @notice Number of tokens for the NFT which have been claimed at the current timestamp.
     * @param tokenId The NFT token id.
     * @return payout The total amount of payout tokens claimed for this NFT.
     */
    function claimedPayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice Number of tokens for the NFT which can be claimed at the current timestamp.
     * @dev It is RECOMMENDED that this is calculated as the `vestedPayout()` subtracted from `payoutClaimed()`.
     * @param tokenId The NFT token id.
     * @return payout The amount of unlocked payout tokens for the NFT which have not yet been claimed.
     */
    function claimablePayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice Total amount of tokens which have been vested at the current timestamp.
     *  This number also includes vested tokens which have been claimed.
     * @dev It is RECOMMENDED that this function calls `vestedPayoutAtTime`
     *  with `block.timestamp` as the `timestamp` parameter.
     * @param tokenId The NFT token id.
     * @return payout Total amount of tokens which have been vested at the current timestamp.
     */
    function vestedPayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice Total amount of vested tokens at the provided timestamp.
     *  This number also includes vested tokens which have been claimed.
     * @dev `timestamp` MAY be both in the future and in the past.
     *  Zero MUST be returned if the timestamp is before the token was minted.
     * @param tokenId The NFT token id.
     * @param timestamp The timestamp to check on, can be both in the past and the future.
     * @return payout Total amount of tokens which have been vested at the provided timestamp.
     */
    function vestedPayoutAtTime(uint256 tokenId, uint256 timestamp) external view returns (uint256 payout);

    /**
     * @notice Number of tokens for an NFT which are currently vesting.
     * @dev The sum of vestedPayout and vestingPayout SHOULD always be the total payout.
     * @param tokenId The NFT token id.
     * @return payout The number of tokens for the NFT which are vesting until a future date.
     */
    function vestingPayout(uint256 tokenId) external view returns (uint256 payout);

    /**
     * @notice The start and end timestamps for the vesting of the provided NFT.
     *  MUST return the timestamp where no further increase in vestedPayout occurs for `vestingEnd`.
     * @param tokenId The NFT token id.
     * @return vestingStart The beginning of the vesting as a unix timestamp.
     * @return vestingEnd The ending of the vesting as a unix timestamp.
     */
    function vestingPeriod(uint256 tokenId) external view returns (uint256 vestingStart, uint256 vestingEnd);

    /**
     * @notice Token which is used to pay out the vesting claims.
     * @param tokenId The NFT token id.
     * @return token The token which is used to pay out the vesting claims.
     */
    function payoutToken(uint256 tokenId) external view returns (address token);

    /**
     * @notice Sets a global `operator` with permission to manage all tokens owned by the current `msg.sender`.
     * @param operator The address to let manage all tokens.
     * @param approved A boolean indicating whether the spender is approved to claim for all tokens.
     */
    function setClaimApprovalForAll(address operator, bool approved) external;

    /**
     * @notice Sets a tokenId `operator` with permission to manage a single `tokenId` owned by the `msg.sender`.
     * @param operator The address to let manage a single `tokenId`.
     * @param tokenId the `tokenId` to be managed.
     * @param approved A boolean indicating whether the spender is approved to claim for all tokens.
     */
    function setClaimApproval(address operator, bool approved, uint256 tokenId) external;

    /**
     * @notice Returns true if `owner` has set `operator` to manage all `tokenId`s.
     * @param owner The owner allowing `operator` to manage all `tokenId`s.
     * @param operator The address who is given permission to spend tokens on behalf of the `owner`.
     */
    function isClaimApprovedForAll(address owner, address operator) external view returns (bool isClaimApproved);

    /**
     * @notice Returns the operating address for a `tokenId`.
     *  If `tokenId` is not managed, then returns the zero address.
     * @param tokenId The NFT `tokenId` to query for a `tokenId` manager.
     */
    function getClaimApproved(uint256 tokenId) external view returns (address operator);
}

interface IERC5725_ExtendedApproval is IERC5725Upgradeable {
    /**
     * @notice Returns true if `operator` is allowed to transfer the `tokenId` NFT.
     * @param operator The address to check if it is approved for the transfer
     * @param tokenId The token id to check if the operator is approved for
     */
    function isApprovedOrOwner(address operator, uint tokenId) external view returns (bool);

    /**
     * @notice Returns true if `operator` is allowed to claim for the provided tokenId
     * @param operator The address to check if it is approved for the claim or owner of the token
     * @param tokenId The token id to check if the operator is approved for
     */
    function isApprovedClaimOrOwner(address operator, uint256 tokenId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (governance/utils/IVotes.sol)
pragma solidity ^0.8.0;

/**
 * @dev Common interface for {ERC20Votes}, {ERC721Votes}, and other {Votes}-enabled contracts.
 *
 * _Available since v4.5._
 */
interface IVotes {
    /**
     * @dev Emitted when an account changes their delegate.
     */
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /**
     * @dev Emitted when a token transfer or delegate change results in changes to a delegate's number of votes.
     */
    event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);

    /**
     * @dev Returns the current amount of votes that `account` has.
     */
    function getVotes(address account) external view returns (uint256);

    /**
     * @dev Returns the amount of votes that `account` had at a specific moment in the past. If the `clock()` is
     * configured to use block numbers, this will return the value at the end of the corresponding block.
     */
    function getPastVotes(address account, uint256 timepoint) external view returns (uint256);

    /**
     * @dev Returns the total supply of votes available at a specific moment in the past. If the `clock()` is
     * configured to use block numbers, this will return the value at the end of the corresponding block.
     *
     * NOTE: This value is the sum of all available votes, which is not necessarily the sum of all delegated votes.
     * Votes that have not been delegated are still part of total supply, even though they would not participate in a
     * vote.
     */
    function getPastTotalSupply(uint256 timepoint) external view returns (uint256);

    /**
     * @dev Returns the delegate that `account` has chosen.
     */
    function delegates(address account) external view returns (address);

    /**
     * @dev Delegates votes from the sender to `delegatee`.
     */
    function delegate(address delegatee) external;

    /**
     * @notice Removed from the interface to avoid signature conflicts.
     * @dev Delegates votes from signer to `delegatee`.
     */
    // function delegateBySig(address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s) external;
}

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

import {IVotes} from "./interfaces/IVotes.sol";
import {Checkpoints} from "./libraries/Checkpoints.sol";
import {IERC5725_ExtendedApproval} from "./erc5725/IERC5725Upgradeable.sol";
import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import {IERC721EnumerableUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol";
import {IVersionable} from "../../interfaces/IVersionable.sol";

/**
 * @title Voting Escrow V2 Interface for Upgrades
 */
interface IVotingEscrowV2 is IVotes, IERC5725_ExtendedApproval, IERC721EnumerableUpgradeable, IVersionable {
    struct LockDetails {
        uint256 amount; /// @dev amount of tokens locked
        uint256 startTime; /// @dev when locking started
        uint256 endTime; /// @dev when locking ends
        bool isPermanent; /// @dev if its a permanent lock
    }

    /// -----------------------------------------------------------------------
    /// Events
    /// -----------------------------------------------------------------------

    event SupplyUpdated(uint256 oldSupply, uint256 newSupply);
    /// @notice Lock events
    event LockCreated(uint256 indexed tokenId, address indexed to, uint256 value, uint256 unlockTime, bool isPermanent);
    event LockUpdated(uint256 indexed tokenId, uint256 value, uint256 unlockTime, bool isPermanent);
    event LockMerged(
        uint256 indexed fromTokenId,
        uint256 indexed toTokenId,
        uint256 totalValue,
        uint256 unlockTime,
        bool isPermanent
    );
    event LockSplit(uint256[] splitWeights, uint256 indexed _tokenId);
    event LockDurationExtended(uint256 indexed tokenId, uint256 newUnlockTime, bool isPermanent);
    event LockAmountIncreased(uint256 indexed tokenId, uint256 value);
    event UnlockPermanent(uint256 indexed tokenId, address indexed sender, uint256 unlockTime);
    /// @notice Delegate events
    event LockDelegateChanged(
        uint256 indexed tokenId,
        address indexed delegator,
        address fromDelegate,
        address indexed toDelegate
    );

    /// -----------------------------------------------------------------------
    /// Errors
    /// -----------------------------------------------------------------------

    error AlreadyVoted();
    error InvalidNonce();
    error InvalidDelegatee();
    error InvalidSignature();
    error InvalidSignatureS();
    error InvalidWeights();
    error LockDurationNotInFuture();
    error LockDurationTooLong();
    error LockExpired();
    error LockNotExpired();
    error LockHoldsValue();
    error LockModifiedDelay();
    error NotPermanentLock();
    error PermanentLock();
    error PermanentLockMismatch();
    error SameNFT();
    error SignatureExpired();
    error ZeroAmount();
    error NotLockOwner();

    function supply() external view returns (uint);

    function token() external view returns (IERC20Upgradeable);

    function totalNftsMinted() external view returns (uint256);

    function balanceOfNFT(uint256 _tokenId) external view returns (uint256);

    function balanceOfNFTAt(uint256 _tokenId, uint256 _timestamp) external view returns (uint256);

    function delegates(uint256 tokenId, uint48 timestamp) external view returns (address);

    function lockDetails(uint256 tokenId) external view returns (LockDetails calldata);

    function getPastEscrowPoint(
        uint256 _tokenId,
        uint256 _timePoint
    ) external view returns (Checkpoints.Point memory, uint48);

    function getFirstEscrowPoint(uint256 _tokenId) external view returns (Checkpoints.Point memory, uint48);

    function checkpoint() external;

    function increaseAmount(uint256 _tokenId, uint256 _value) external;

    function createLockFor(
        uint256 _value,
        uint256 _lockDuration,
        address _to,
        bool _permanent
    ) external returns (uint256);

    function createDelegatedLockFor(
        uint256 _value,
        uint256 _lockDuration,
        address _to,
        address _delegatee,
        bool _permanent
    ) external returns (uint256);

    function split(uint256[] memory _weights, uint256 _tokenId) external;

    function merge(uint256 _from, uint256 _to) external;

    function burn(uint256 _tokenId) external;

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

// SPDX-License-Identifier: MIT
// This file was derived from OpenZeppelin Contracts (last updated v5.0.0) (utils/structs/Checkpoints.sol)

pragma solidity 0.8.13;

import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";

/**
 * @dev This library defines the `Trace*` struct, for checkpointing values as they change at different points in
 * time, and later looking up past values by block number. See {Votes} as an example.
 *
 * To create a history of checkpoints define a variable type `Checkpoints.Trace*` in your contract, and store a new
 * checkpoint for the current transaction block using the {push} function.
 */
library Checkpoints {
    struct Trace {
        Checkpoint[] _checkpoints;
    }

    /**
     * @dev Struct to keep track of the voting power over time.
     */
    struct Point {
        /// @dev The voting power at a specific time
        /// - MUST never be negative.
        int128 bias;
        /// @dev The rate at which the voting power decreases over time.
        int128 slope;
        /// @dev The value of tokens which do not decrease over time, representing permanent voting power
        /// - MUST never be negative.
        int128 permanent;
    }

    struct Checkpoint {
        uint48 _key;
        Point _value;
    }

    /**
     * @dev A value was attempted to be inserted on a past checkpoint.
     */
    error CheckpointUnorderedInsertions();

    /**
     * @dev Pushes a (`key`, `value`) pair into a Trace so that it is stored as the checkpoint.
     *
     * Returns previous value and new value.
     *
     * IMPORTANT: Never accept `key` as a user input, since an arbitrary `type(uint48).max` key set will disable the
     * library.
     */
    function push(Trace storage self, uint48 key, Point memory value) internal returns (Point memory, Point memory) {
        return _insert(self._checkpoints, key, value);
    }

    /**
     * @dev Returns the value in the first (oldest) checkpoint with key greater or equal than the search key, or zero if
     * there is none.
     */
    function lowerLookup(Trace storage self, uint48 key) internal view returns (Point memory) {
        uint256 len = self._checkpoints.length;
        uint256 pos = _lowerBinaryLookup(self._checkpoints, key, 0, len);
        return pos == len ? blankPoint() : _unsafeAccess(self._checkpoints, pos)._value;
    }

    /**
     * @dev Returns the value in the last (most recent) checkpoint with key lower or equal than the search key, or zero
     * if there is none.
     */
    function upperLookup(
        Trace storage self,
        uint48 key
    ) internal view returns (bool exists, uint48 _key, Point memory _value) {
        uint256 len = self._checkpoints.length;
        uint256 pos = _upperBinaryLookup(self._checkpoints, key, 0, len);

        exists = pos != 0;
        _value = exists ? _unsafeAccess(self._checkpoints, pos - 1)._value : blankPoint();
        _key = exists ? _unsafeAccess(self._checkpoints, pos - 1)._key : 0;
    }

    /**
     * @dev Returns the value in the last (most recent) checkpoint with key lower or equal than the search key, or zero
     * if there is none.
     *
     * NOTE: This is a variant of {upperLookup} that is optimised to find "recent" checkpoint (checkpoints with high
     * keys).
     */
    function upperLookupRecent(
        Trace storage self,
        uint48 key
    ) internal view returns (bool exists, uint48 _key, Point memory _value) {
        uint256 len = self._checkpoints.length;

        uint256 low = 0;
        uint256 high = len;

        if (len > 5) {
            uint256 mid = len - Math.sqrt(len);
            if (key < _unsafeAccess(self._checkpoints, mid)._key) {
                high = mid;
            } else {
                low = mid + 1;
            }
        }

        uint256 pos = _upperBinaryLookup(self._checkpoints, key, low, high);

        exists = pos != 0;
        _value = exists ? _unsafeAccess(self._checkpoints, pos - 1)._value : blankPoint();
        _key = exists ? _unsafeAccess(self._checkpoints, pos - 1)._key : 0;
    }

    /**
     * @dev Returns the value in the most recent checkpoint, or zero if there are no checkpoints.
     */
    function latest(Trace storage self) internal view returns (Point memory) {
        uint256 pos = self._checkpoints.length;
        return pos == 0 ? blankPoint() : _unsafeAccess(self._checkpoints, pos - 1)._value;
    }

    /**
     * @dev Returns whether there is a checkpoint in the structure (i.e. it is not empty), and if so the key and value
     * in the most recent checkpoint.
     */
    function latestCheckpoint(
        Trace storage self
    ) internal view returns (bool exists, uint48 _key, Point memory _value) {
        uint256 pos = self._checkpoints.length;
        if (pos == 0) {
            return (false, 0, blankPoint());
        } else {
            Checkpoint memory ckpt = _unsafeAccess(self._checkpoints, pos - 1);
            return (true, ckpt._key, ckpt._value);
        }
    }

    /**
     * @dev Returns whether there is a checkpoint in the structure (i.e. it is not empty), and if so the key and value
     * in the most recent checkpoint.
     */
    function firstCheckpoint(
        Trace storage self
    ) internal view returns (bool exists, uint48 _key, Point memory _value) {
        uint256 pos = self._checkpoints.length;
        if (pos == 0) {
            return (false, 0, blankPoint());
        } else {
            Checkpoint memory ckpt = _unsafeAccess(self._checkpoints, 0);
            return (true, ckpt._key, ckpt._value);
        }
    }

    /**
     * @dev Returns the number of checkpoint.
     */
    function length(Trace storage self) internal view returns (uint256) {
        return self._checkpoints.length;
    }

    /**
     * @dev Returns checkpoint at given position.
     */
    function at(Trace storage self, uint48 pos) internal view returns (Checkpoint memory) {
        return self._checkpoints[pos];
    }

    /**
     * @dev Pushes a (`key`, `value`) pair into an ordered list of checkpoints, either by inserting a new checkpoint,
     * or by updating the last one.
     */
    function _insert(
        Checkpoint[] storage self,
        uint48 key,
        Point memory value
    ) private returns (Point memory, Point memory) {
        uint256 pos = self.length;

        if (pos > 0) {
            // Copying to memory is important here.
            Checkpoint memory last = _unsafeAccess(self, pos - 1);

            // Checkpoint keys must be non-decreasing.
            if (last._key > key) {
                revert CheckpointUnorderedInsertions();
            }

            // Update or push new checkpoint
            if (last._key == key) {
                _unsafeAccess(self, pos - 1)._value = value;
            } else {
                self.push(Checkpoint({_key: key, _value: value}));
            }
            return (last._value, value);
        } else {
            self.push(Checkpoint({_key: key, _value: value}));
            return (blankPoint(), value);
        }
    }

    /**
     * @dev Return the index of the last (most recent) checkpoint with key lower or equal than the search key, or `high`
     * if there is none. `low` and `high` define a section where to do the search, with inclusive `low` and exclusive
     * `high`.
     *
     * WARNING: `high` should not be greater than the array's length.
     */
    function _upperBinaryLookup(
        Checkpoint[] storage self,
        uint48 key,
        uint256 low,
        uint256 high
    ) private view returns (uint256) {
        while (low < high) {
            uint256 mid = Math.average(low, high);
            if (_unsafeAccess(self, mid)._key > key) {
                high = mid;
            } else {
                low = mid + 1;
            }
        }
        return high;
    }

    /**
     * @dev Return the index of the first (oldest) checkpoint with key is greater or equal than the search key, or
     * `high` if there is none. `low` and `high` define a section where to do the search, with inclusive `low` and
     * exclusive `high`.
     *
     * WARNING: `high` should not be greater than the array's length.
     */
    function _lowerBinaryLookup(
        Checkpoint[] storage self,
        uint48 key,
        uint256 low,
        uint256 high
    ) private view returns (uint256) {
        while (low < high) {
            uint256 mid = Math.average(low, high);
            if (_unsafeAccess(self, mid)._key < key) {
                low = mid + 1;
            } else {
                high = mid;
            }
        }
        return high;
    }

    /**
     * @dev Access an element of the array without performing bounds check. The position is assumed to be within bounds.
     */
    function _unsafeAccess(Checkpoint[] storage self, uint256 pos) private view returns (Checkpoint storage result) {
        return self[pos];
    }

    /**
     * @dev Access an element of the array without performing bounds check. The position is assumed to be within bounds.
     */
    function _realUnsafeAccess(
        Checkpoint[] storage self,
        uint256 pos
    ) private pure returns (Checkpoint storage result) {
        assembly {
            mstore(0, self.slot)
            result.slot := add(keccak256(0, 0x20), pos)
        }
    }

    function blankPoint() internal pure returns (Point memory) {
        return Point({bias: 0, slope: 0, permanent: 0});
    }

    struct TraceAddress {
        CheckpointAddress[] _checkpoints;
    }

    struct CheckpointAddress {
        uint48 _key;
        address _value;
    }

    /**
     * @dev Pushes a (`key`, `value`) pair into a TraceAddress so that it is stored as the checkpoint.
     *
     * Returns previous value and new value.
     *
     * IMPORTANT: Never accept `key` as a user input, since an arbitrary `type(uint48).max` key set will disable the
     * library.
     */
    function push(TraceAddress storage self, uint48 key, address value) internal returns (address, address) {
        return _insert(self._checkpoints, key, value);
    }

    /**
     * @dev Returns the value in the first (oldest) checkpoint with key greater or equal than the search key, or zero if
     * there is none.
     */
    function lowerLookup(TraceAddress storage self, uint48 key) internal view returns (address) {
        uint256 len = self._checkpoints.length;
        uint256 pos = _lowerBinaryLookup(self._checkpoints, key, 0, len);
        return pos == len ? address(0) : _unsafeAccess(self._checkpoints, pos)._value;
    }

    /**
     * @dev Returns the value in the last (most recent) checkpoint with key lower or equal than the search key, or zero
     * if there is none.
     */
    function upperLookup(TraceAddress storage self, uint48 key) internal view returns (address) {
        uint256 len = self._checkpoints.length;
        uint256 pos = _upperBinaryLookup(self._checkpoints, key, 0, len);
        return pos == 0 ? address(0) : _unsafeAccess(self._checkpoints, pos - 1)._value;
    }

    /**
     * @dev Returns the value in the last (most recent) checkpoint with key lower or equal than the search key, or zero
     * if there is none.
     *
     * NOTE: This is a variant of {upperLookup} that is optimised to find "recent" checkpoint (checkpoints with high
     * keys).
     */
    function upperLookupRecent(TraceAddress storage self, uint48 key) internal view returns (address) {
        uint256 len = self._checkpoints.length;

        uint256 low = 0;
        uint256 high = len;

        if (len > 5) {
            uint256 mid = len - Math.sqrt(len);
            if (key < _unsafeAccess(self._checkpoints, mid)._key) {
                high = mid;
            } else {
                low = mid + 1;
            }
        }

        uint256 pos = _upperBinaryLookup(self._checkpoints, key, low, high);

        return pos == 0 ? address(0) : _unsafeAccess(self._checkpoints, pos - 1)._value;
    }

    /**
     * @dev Returns the value in the most recent checkpoint, or zero if there are no checkpoints.
     */
    function latest(TraceAddress storage self) internal view returns (address) {
        uint256 pos = self._checkpoints.length;
        return pos == 0 ? address(0) : _unsafeAccess(self._checkpoints, pos - 1)._value;
    }

    /**
     * @dev Returns whether there is a checkpoint in the structure (i.e. it is not empty), and if so the key and value
     * in the most recent checkpoint.
     */
    function latestCheckpoint(
        TraceAddress storage self
    ) internal view returns (bool exists, uint48 _key, address _value) {
        uint256 pos = self._checkpoints.length;
        if (pos == 0) {
            return (false, 0, address(0));
        } else {
            CheckpointAddress memory ckpt = _unsafeAccess(self._checkpoints, pos - 1);
            return (true, ckpt._key, ckpt._value);
        }
    }

    /**
     * @dev Returns the number of checkpoint.
     */
    function length(TraceAddress storage self) internal view returns (uint256) {
        return self._checkpoints.length;
    }

    /**
     * @dev Returns checkpoint at given position.
     */
    function at(TraceAddress storage self, uint48 pos) internal view returns (CheckpointAddress memory) {
        return self._checkpoints[pos];
    }

    /**
     * @dev Pushes a (`key`, `value`) pair into an ordered list of checkpoints, either by inserting a new checkpoint,
     * or by updating the last one.
     */
    function _insert(CheckpointAddress[] storage self, uint48 key, address value) private returns (address, address) {
        uint256 pos = self.length;

        if (pos > 0) {
            // Copying to memory is important here.
            CheckpointAddress memory last = _unsafeAccess(self, pos - 1);

            // Checkpoint keys must be non-decreasing.
            if (last._key > key) {
                revert CheckpointUnorderedInsertions();
            }

            // Update or push new checkpoint
            if (last._key == key) {
                _unsafeAccess(self, pos - 1)._value = value;
            } else {
                self.push(CheckpointAddress({_key: key, _value: value}));
            }
            return (last._value, value);
        } else {
            self.push(CheckpointAddress({_key: key, _value: value}));
            return (address(0), value);
        }
    }

    /**
     * @dev Return the index of the last (most recent) checkpoint with key lower or equal than the search key, or `high`
     * if there is none. `low` and `high` define a section where to do the search, with inclusive `low` and exclusive
     * `high`.
     *
     * WARNING: `high` should not be greater than the array's length.
     */
    function _upperBinaryLookup(
        CheckpointAddress[] storage self,
        uint48 key,
        uint256 low,
        uint256 high
    ) private view returns (uint256) {
        while (low < high) {
            uint256 mid = Math.average(low, high);
            if (_unsafeAccess(self, mid)._key > key) {
                high = mid;
            } else {
                low = mid + 1;
            }
        }
        return high;
    }

    /**
     * @dev Return the index of the first (oldest) checkpoint with key is greater or equal than the search key, or
     * `high` if there is none. `low` and `high` define a section where to do the search, with inclusive `low` and
     * exclusive `high`.
     *
     * WARNING: `high` should not be greater than the array's length.
     */
    function _lowerBinaryLookup(
        CheckpointAddress[] storage self,
        uint48 key,
        uint256 low,
        uint256 high
    ) private view returns (uint256) {
        while (low < high) {
            uint256 mid = Math.average(low, high);
            if (_unsafeAccess(self, mid)._key < key) {
                low = mid + 1;
            } else {
                high = mid;
            }
        }
        return high;
    }

    /**
     * @dev Access an element of the array without performing bounds check. The position is assumed to be within bounds.
     */
    function _unsafeAccess(
        CheckpointAddress[] storage self,
        uint256 pos
    ) private pure returns (CheckpointAddress storage result) {
        assembly {
            mstore(0, self.slot)
            result.slot := add(keccak256(0, 0x20), pos)
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_voting_escrow","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"}],"name":"CheckpointToken","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"claim_epoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"max_epoch","type":"uint256"}],"name":"Claimed","type":"event"},{"inputs":[],"name":"VERSION","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkpoint_token","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"checkpoint_total_supply","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"claim","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"}],"name":"claim_many","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"claimable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"depositor","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"last_token_time","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_depositor","type":"address"}],"name":"setDepositor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"setOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"start_time","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"time_cursor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"time_cursor_of","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"timestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token_last_balance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"tokens_per_week","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"voting_escrow","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"withdrawERC20","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000058aa310ee85d94b20de2e213b36dbb52f9898dd2

-----Decoded View---------------
Arg [0] : _voting_escrow (address): 0x58Aa310eE85d94b20De2e213b36DbB52F9898dD2

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000058aa310ee85d94b20de2e213b36dbb52f9898dd2