// 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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (metatx/ERC2771Context.sol)

pragma solidity ^0.8.9;

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

/**
 * @dev Context variant with ERC2771 support.
 */
abstract contract ERC2771Context is Context {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    address private immutable _trustedForwarder;

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor(address trustedForwarder) {
        _trustedForwarder = trustedForwarder;
    }

    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
        return forwarder == _trustedForwarder;
    }

    function _msgSender() internal view virtual override returns (address sender) {
        if (isTrustedForwarder(msg.sender)) {
            // The assembly code is more direct than the Solidity version using `abi.decode`.
            /// @solidity memory-safe-assembly
            assembly {
                sender := shr(96, calldataload(sub(calldatasize(), 20)))
            }
        } else {
            return super._msgSender();
        }
    }

    function _msgData() internal view virtual override returns (bytes calldata) {
        if (isTrustedForwarder(msg.sender)) {
            return msg.data[:msg.data.length - 20];
        } else {
            return super._msgData();
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.19;

import {VotingReward} from "./VotingReward.sol";
import {IVoter} from "../interfaces/IVoter.sol";

/// @notice Bribes pay out rewards for a given pool based on the votes that were received from the user (goes hand in hand with Voter.vote())
contract FeesVotingReward is VotingReward {
    constructor(
        address _forwarder,
        address _voter,
        address[] memory _rewards
    ) VotingReward(_forwarder, _voter, _rewards) {}

    /// @inheritdoc VotingReward
    function notifyRewardAmount(address token, uint256 amount) external override nonReentrant {
        address sender = _msgSender();
        if (IVoter(voter).gaugeToFees(sender) != address(this)) revert NotGauge();
        if (!isReward[token]) revert InvalidReward();

        _notifyRewardAmount(sender, token, amount);
    }
}

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

pragma solidity ^0.8.0;

import "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "./IERC165.sol";
import "./IERC721.sol";

/// @title EIP-721 Metadata Update Extension
interface IERC4906 is IERC165, IERC721 {
    /// @dev This event emits when the metadata of a token is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFT.
    event MetadataUpdate(uint256 _tokenId);

    /// @dev This event emits when the metadata of a range of tokens is changed.
    /// So that the third-party platforms such as NFT market could
    /// timely update the images and related attributes of the NFTs.
    event BatchMetadataUpdate(uint256 _fromTokenId, uint256 _toTokenId);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (interfaces/IERC6372.sol)

pragma solidity ^0.8.0;

interface IERC6372 {
    /**
     * @dev Clock used for flagging checkpoints. Can be overridden to implement timestamp based checkpoints (and voting).
     */
    function clock() external view returns (uint48);

    /**
     * @dev Description of the clock
     */
    // solhint-disable-next-line func-name-mixedcase
    function CLOCK_MODE() external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @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 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IReward {
    error InvalidReward();
    error NotAuthorized();
    error NotGauge();
    error NotEscrowToken();
    error NotSingleToken();
    error NotVotingEscrow();
    error NotWhitelisted();
    error ZeroAmount();

    event Deposit(address indexed from, uint256 indexed tokenId, uint256 amount);
    event Withdraw(address indexed from, uint256 indexed tokenId, uint256 amount);
    event NotifyReward(address indexed from, address indexed reward, uint256 indexed epoch, uint256 amount);
    event ClaimRewards(address indexed from, address indexed reward, uint256 amount);

    /// @notice A checkpoint for marking balance
    struct Checkpoint {
        uint256 timestamp;
        uint256 balanceOf;
    }

    /// @notice A checkpoint for marking supply
    struct SupplyCheckpoint {
        uint256 timestamp;
        uint256 supply;
    }

    /// @notice Epoch duration constant (7 days)
    function DURATION() external view returns (uint256);

    /// @notice Address of Voter.sol
    function voter() external view returns (address);

    /// @notice Address of VotingEscrow.sol
    function ve() external view returns (address);

    /// @dev Address which has permission to externally call _deposit() & _withdraw()
    function authorized() external view returns (address);

    /// @notice Total amount currently deposited via _deposit()
    function totalSupply() external view returns (uint256);

    /// @notice Current amount deposited by tokenId
    function balanceOf(uint256 tokenId) external view returns (uint256);

    /// @notice Amount of tokens to reward depositors for a given epoch
    /// @param token Address of token to reward
    /// @param epochStart Startime of rewards epoch
    /// @return Amount of token
    function tokenRewardsPerEpoch(address token, uint256 epochStart) external view returns (uint256);

    /// @notice Most recent timestamp a veNFT has claimed their rewards
    /// @param  token Address of token rewarded
    /// @param tokenId veNFT unique identifier
    /// @return Timestamp
    function lastEarn(address token, uint256 tokenId) external view returns (uint256);

    /// @notice True if a token is or has been an active reward token, else false
    function isReward(address token) external view returns (bool);

    /// @notice The number of checkpoints for each tokenId deposited
    function numCheckpoints(uint256 tokenId) external view returns (uint256);

    /// @notice The total number of checkpoints
    function supplyNumCheckpoints() external view returns (uint256);

    /// @notice Deposit an amount into the rewards contract to earn future rewards associated to a veNFT
    /// @dev Internal notation used as only callable internally by `authorized`.
    /// @param amount   Amount deposited for the veNFT
    /// @param tokenId  Unique identifier of the veNFT
    function _deposit(uint256 amount, uint256 tokenId) external;

    /// @notice Withdraw an amount from the rewards contract associated to a veNFT
    /// @dev Internal notation used as only callable internally by `authorized`.
    /// @param amount   Amount deposited for the veNFT
    /// @param tokenId  Unique identifier of the veNFT
    function _withdraw(uint256 amount, uint256 tokenId) external;

    /// @notice Claim the rewards earned by a veNFT staker
    /// @param tokenId  Unique identifier of the veNFT
    /// @param tokens   Array of tokens to claim rewards of
    function getReward(uint256 tokenId, address[] memory tokens) external;

    /// @notice Add rewards for stakers to earn
    /// @param token    Address of token to reward
    /// @param amount   Amount of token to transfer to rewards
    function notifyRewardAmount(address token, uint256 amount) external;

    /// @notice Determine the prior balance for an account as of a block number
    /// @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
    /// @param tokenId      The token of the NFT to check
    /// @param timestamp    The timestamp to get the balance at
    /// @return The balance the account had as of the given block
    function getPriorBalanceIndex(uint256 tokenId, uint256 timestamp) external view returns (uint256);

    /// @notice Determine the prior index of supply staked by of a timestamp
    /// @dev Timestamp must be <= current timestamp
    /// @param timestamp The timestamp to get the index at
    /// @return Index of supply checkpoint
    function getPriorSupplyIndex(uint256 timestamp) external view returns (uint256);

    /// @notice Get number of rewards tokens
    function rewardsListLength() external view returns (uint256);

    /// @notice Calculate how much in rewards are earned for a specific token and veNFT
    /// @param token Address of token to fetch rewards of
    /// @param tokenId Unique identifier of the veNFT
    /// @return Amount of token earned in rewards
    function earned(address token, uint256 tokenId) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IVoter {
    error AlreadyVotedOrDeposited();
    error DistributeWindow();
    error FactoryPathNotApproved();
    error GaugeAlreadyKilled();
    error GaugeAlreadyRevived();
    error GaugeExists();
    error GaugeDoesNotExist(address _pool);
    error GaugeNotAlive(address _gauge);
    error InactiveManagedNFT();
    error MaximumVotingNumberTooLow();
    error NonZeroVotes();
    error NotAPool();
    error NotApprovedOrOwner();
    error NotGovernor();
    error NotEmergencyCouncil();
    error NotMinter();
    error NotWhitelistedNFT();
    error NotWhitelistedToken();
    error SameValue();
    error SpecialVotingWindow();
    error TooManyPools();
    error UnequalLengths();
    error ZeroBalance();
    error ZeroAddress();

    event GaugeCreated(
        address indexed poolFactory,
        address indexed votingRewardsFactory,
        address indexed gaugeFactory,
        address pool,
        address bribeVotingReward,
        address feeVotingReward,
        address gauge,
        address creator
    );
    event GaugeKilled(address indexed gauge);
    event GaugeRevived(address indexed gauge);
    event Voted(
        address indexed voter,
        address indexed pool,
        uint256 indexed tokenId,
        uint256 weight,
        uint256 totalWeight,
        uint256 timestamp
    );
    event Abstained(
        address indexed voter,
        address indexed pool,
        uint256 indexed tokenId,
        uint256 weight,
        uint256 totalWeight,
        uint256 timestamp
    );
    event NotifyReward(address indexed sender, address indexed reward, uint256 amount);
    event DistributeReward(address indexed sender, address indexed gauge, uint256 amount);
    event WhitelistToken(address indexed whitelister, address indexed token, bool indexed _bool);
    event WhitelistNFT(address indexed whitelister, uint256 indexed tokenId, bool indexed _bool);

    /// @notice Store trusted forwarder address to pass into factories
    function forwarder() external view returns (address);

    /// @notice The ve token that governs these contracts
    function ve() external view returns (address);

    /// @notice Factory registry for valid pool / gauge / rewards factories
    function factoryRegistry() external view returns (address);

    /// @notice Address of Minter.sol
    function minter() external view returns (address);

    /// @notice Standard OZ IGovernor using ve for vote weights.
    function governor() external view returns (address);

    /// @notice Custom Epoch Governor using ve for vote weights.
    function epochGovernor() external view returns (address);

    /// @notice credibly neutral party similar to Curve's Emergency DAO
    function emergencyCouncil() external view returns (address);

    /// @dev Total Voting Weights
    function totalWeight() external view returns (uint256);

    /// @dev Most number of pools one voter can vote for at once
    function maxVotingNum() external view returns (uint256);

    // mappings
    /// @dev Pool => Gauge
    function gauges(address pool) external view returns (address);

    /// @dev Gauge => Pool
    function poolForGauge(address gauge) external view returns (address);

    /// @dev Gauge => Fees Voting Reward
    function gaugeToFees(address gauge) external view returns (address);

    /// @dev Gauge => Bribes Voting Reward
    function gaugeToBribe(address gauge) external view returns (address);

    /// @dev Pool => Weights
    function weights(address pool) external view returns (uint256);

    /// @dev NFT => Pool => Votes
    function votes(uint256 tokenId, address pool) external view returns (uint256);

    /// @dev NFT => Total voting weight of NFT
    function usedWeights(uint256 tokenId) external view returns (uint256);

    /// @dev Nft => Timestamp of last vote (ensures single vote per epoch)
    function lastVoted(uint256 tokenId) external view returns (uint256);

    /// @dev Address => Gauge
    function isGauge(address) external view returns (bool);

    /// @dev Token => Whitelisted status
    function isWhitelistedToken(address token) external view returns (bool);

    /// @dev TokenId => Whitelisted status
    function isWhitelistedNFT(uint256 tokenId) external view returns (bool);

    /// @dev Gauge => Liveness status
    function isAlive(address gauge) external view returns (bool);

    /// @dev Gauge => Amount claimable
    function claimable(address gauge) external view returns (uint256);

    /// @notice Number of pools with a Gauge
    function length() external view returns (uint256);

    /// @notice Called by Minter to distribute weekly emissions rewards for disbursement amongst gauges.
    /// @dev Assumes totalWeight != 0 (Will never be zero as long as users are voting).
    ///      Throws if not called by minter.
    /// @param _amount Amount of rewards to distribute.
    function notifyRewardAmount(uint256 _amount) external;

    /// @dev Utility to distribute to gauges of pools in range _start to _finish.
    /// @param _start   Starting index of gauges to distribute to.
    /// @param _finish  Ending index of gauges to distribute to.
    function distribute(uint256 _start, uint256 _finish) external;

    /// @dev Utility to distribute to gauges of pools in array.
    /// @param _gauges Array of gauges to distribute to.
    function distribute(address[] memory _gauges) external;

    /// @notice Called by users to update voting balances in voting rewards contracts.
    /// @param _tokenId Id of veNFT whose balance you wish to update.
    function poke(uint256 _tokenId) external;

    /// @notice Called by users to vote for pools. Votes distributed proportionally based on weights.
    ///         Can only vote or deposit into a managed NFT once per epoch.
    ///         Can only vote for gauges that have not been killed.
    /// @dev Weights are distributed proportional to the sum of the weights in the array.
    ///      Throws if length of _poolVote and _weights do not match.
    /// @param _tokenId     Id of veNFT you are voting with.
    /// @param _poolVote    Array of pools you are voting for.
    /// @param _weights     Weights of pools.
    function vote(uint256 _tokenId, address[] calldata _poolVote, uint256[] calldata _weights) external;

    /// @notice Called by users to reset voting state. Required if you wish to make changes to
    ///         veNFT state (e.g. merge, split, deposit into managed etc).
    ///         Cannot reset in the same epoch that you voted in.
    ///         Can vote or deposit into a managed NFT again after reset.
    /// @param _tokenId Id of veNFT you are reseting.
    function reset(uint256 _tokenId) external;

    /// @notice Called by users to deposit into a managed NFT.
    ///         Can only vote or deposit into a managed NFT once per epoch.
    ///         Note that NFTs deposited into a managed NFT will be re-locked
    ///         to the maximum lock time on withdrawal.
    /// @dev Throws if not approved or owner.
    ///      Throws if managed NFT is inactive.
    ///      Throws if depositing within privileged window (one hour prior to epoch flip).
    function depositManaged(uint256 _tokenId, uint256 _mTokenId) external;

    /// @notice Called by users to withdraw from a managed NFT.
    ///         Cannot do it in the same epoch that you deposited into a managed NFT.
    ///         Can vote or deposit into a managed NFT again after withdrawing.
    ///         Note that the NFT withdrawn is re-locked to the maximum lock time.
    function withdrawManaged(uint256 _tokenId) external;

    /// @notice Claim emissions from gauges.
    /// @param _gauges Array of gauges to collect emissions from.
    function claimRewards(address[] memory _gauges) external;

    /// @notice Claim bribes for a given NFT.
    /// @dev Utility to help batch bribe claims.
    /// @param _bribes  Array of BribeVotingReward contracts to collect from.
    /// @param _tokens  Array of tokens that are used as bribes.
    /// @param _tokenId Id of veNFT that you wish to claim bribes for.
    function claimBribes(address[] memory _bribes, address[][] memory _tokens, uint256 _tokenId) external;

    /// @notice Claim fees for a given NFT.
    /// @dev Utility to help batch fee claims.
    /// @param _fees    Array of FeesVotingReward contracts to collect from.
    /// @param _tokens  Array of tokens that are used as fees.
    /// @param _tokenId Id of veNFT that you wish to claim fees for.
    function claimFees(address[] memory _fees, address[][] memory _tokens, uint256 _tokenId) external;

    /// @notice Set new governor.
    /// @dev Throws if not called by governor.
    /// @param _governor .
    function setGovernor(address _governor) external;

    /// @notice Set new epoch based governor.
    /// @dev Throws if not called by governor.
    /// @param _epochGovernor .
    function setEpochGovernor(address _epochGovernor) external;

    /// @notice Set new emergency council.
    /// @dev Throws if not called by emergency council.
    /// @param _emergencyCouncil .
    function setEmergencyCouncil(address _emergencyCouncil) external;

    /// @notice Set maximum number of gauges that can be voted for.
    /// @dev Throws if not called by governor.
    ///      Throws if _maxVotingNum is too low.
    ///      Throws if the values are the same.
    /// @param _maxVotingNum .
    function setMaxVotingNum(uint256 _maxVotingNum) external;

    /// @notice Whitelist (or unwhitelist) token for use in bribes.
    /// @dev Throws if not called by governor.
    /// @param _token .
    /// @param _bool .
    function whitelistToken(address _token, bool _bool) external;

    /// @notice Whitelist (or unwhitelist) token id for voting in last hour prior to epoch flip.
    /// @dev Throws if not called by governor.
    ///      Throws if already whitelisted.
    /// @param _tokenId .
    /// @param _bool .
    function whitelistNFT(uint256 _tokenId, bool _bool) external;

    /// @notice Create a new gauge (unpermissioned).
    /// @dev Governor can create a new gauge for a pool with any address.
    /// @param _poolFactory .
    /// @param _pool .
    function createGauge(address _poolFactory, address _pool) external returns (address);

    /// @notice Kills a gauge. The gauge will not receive any new emissions and cannot be deposited into.
    ///         Can still withdraw from gauge.
    /// @dev Throws if not called by emergency council.
    ///      Throws if gauge already killed.
    /// @param _gauge .
    function killGauge(address _gauge) external;

    /// @notice Revives a killed gauge. Gauge will can receive emissions and deposits again.
    /// @dev Throws if not called by emergency council.
    ///      Throws if gauge is not killed.
    /// @param _gauge .
    function reviveGauge(address _gauge) external;

    /// @dev Update claims to emissions for an array of gauges.
    /// @param _gauges Array of gauges to update emissions for.
    function updateFor(address[] memory _gauges) external;

    /// @dev Update claims to emissions for gauges based on their pool id as stored in Voter.
    /// @param _start   Starting index of pools.
    /// @param _end     Ending index of pools.
    function updateFor(uint256 _start, uint256 _end) external;

    /// @dev Update claims to emissions for single gauge
    /// @param _gauge .
    function updateFor(address _gauge) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/// Modified IVotes interface for tokenId based voting
interface IVotes {
    /**
     * @dev Emitted when an account changes their delegate.
     */
    event DelegateChanged(address indexed delegator, uint256 indexed fromDelegate, uint256 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 amount of votes that `tokenId` had at a specific moment in the past.
     *      If the account passed in is not the owner, returns 0.
     */
    function getPastVotes(address account, uint256 tokenId, 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 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 `tokenId` has chosen. Can never be equal to the delegator's `tokenId`.
     *      Returns 0 if not delegated.
     */
    function delegates(uint256 tokenId) external view returns (uint256);

    /**
     * @dev Delegates votes from the sender to `delegatee`.
     */
    function delegate(uint256 delegator, uint256 delegatee) external;

    /**
     * @dev Delegates votes from `delegator` to `delegatee`. Signer must own `delegator`.
     */
    function delegateBySig(
        uint256 delegator,
        uint256 delegatee,
        uint256 nonce,
        uint256 expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC165, IERC721, IERC721Metadata} from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import {IERC6372} from "@openzeppelin/contracts/interfaces/IERC6372.sol";
import {IERC4906} from "@openzeppelin/contracts/interfaces/IERC4906.sol";
import {IVotes} from "../governance/IVotes.sol";

interface IVotingEscrow is IVotes, IERC4906, IERC6372, IERC721Metadata {
    struct LockedBalance {
        int128 amount;
        uint256 end;
        bool isPermanent;
    }

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

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

    /// @notice A checkpoint for recorded delegated voting weights at a certain timestamp
    struct Checkpoint {
        uint256 fromTimestamp;
        address owner;
        uint256 delegatedBalance;
        uint256 delegatee;
    }

    enum DepositType {
        DEPOSIT_FOR_TYPE,
        CREATE_LOCK_TYPE,
        INCREASE_LOCK_AMOUNT,
        INCREASE_UNLOCK_TIME
    }

    /// @dev Different types of veNFTs:
    /// NORMAL  - typical veNFT
    /// LOCKED  - veNFT which is locked into a MANAGED veNFT
    /// MANAGED - veNFT which can accept the deposit of NORMAL veNFTs
    enum EscrowType {
        NORMAL,
        LOCKED,
        MANAGED
    }

    error AlreadyVoted();
    error AmountTooBig();
    error ERC721ReceiverRejectedTokens();
    error ERC721TransferToNonERC721ReceiverImplementer();
    error InvalidNonce();
    error InvalidSignature();
    error InvalidSignatureS();
    error InvalidManagedNFTId();
    error LockDurationNotInFuture();
    error LockDurationTooLong();
    error LockExpired();
    error LockNotExpired();
    error NoLockFound();
    error NonExistentToken();
    error NotApprovedOrOwner();
    error NotDistributor();
    error NotEmergencyCouncilOrGovernor();
    error NotGovernor();
    error NotGovernorOrManager();
    error NotManagedNFT();
    error NotManagedOrNormalNFT();
    error NotLockedNFT();
    error NotNormalNFT();
    error NotPermanentLock();
    error NotOwner();
    error NotTeam();
    error NotVoter();
    error OwnershipChange();
    error PermanentLock();
    error SameAddress();
    error SameNFT();
    error SameState();
    error SplitNoOwner();
    error SplitNotAllowed();
    error SignatureExpired();
    error TooManyTokenIDs();
    error ZeroAddress();
    error ZeroAmount();
    error ZeroBalance();

    event Deposit(
        address indexed provider,
        uint256 indexed tokenId,
        DepositType indexed depositType,
        uint256 value,
        uint256 locktime,
        uint256 ts
    );
    event Withdraw(address indexed provider, uint256 indexed tokenId, uint256 value, uint256 ts);
    event LockPermanent(address indexed _owner, uint256 indexed _tokenId, uint256 amount, uint256 _ts);
    event UnlockPermanent(address indexed _owner, uint256 indexed _tokenId, uint256 amount, uint256 _ts);
    event Supply(uint256 prevSupply, uint256 supply);
    event Merge(
        address indexed _sender,
        uint256 indexed _from,
        uint256 indexed _to,
        uint256 _amountFrom,
        uint256 _amountTo,
        uint256 _amountFinal,
        uint256 _locktime,
        uint256 _ts
    );
    event Split(
        uint256 indexed _from,
        uint256 indexed _tokenId1,
        uint256 indexed _tokenId2,
        address _sender,
        uint256 _splitAmount1,
        uint256 _splitAmount2,
        uint256 _locktime,
        uint256 _ts
    );
    event CreateManaged(
        address indexed _to,
        uint256 indexed _mTokenId,
        address indexed _from,
        address _lockedManagedReward,
        address _freeManagedReward
    );
    event DepositManaged(
        address indexed _owner,
        uint256 indexed _tokenId,
        uint256 indexed _mTokenId,
        uint256 _weight,
        uint256 _ts
    );
    event WithdrawManaged(
        address indexed _owner,
        uint256 indexed _tokenId,
        uint256 indexed _mTokenId,
        uint256 _weight,
        uint256 _ts
    );
    event SetAllowedManager(address indexed _allowedManager);

    // State variables
    /// @notice Address of Meta-tx Forwarder
    function forwarder() external view returns (address);

    /// @notice Address of FactoryRegistry.sol
    function factoryRegistry() external view returns (address);

    /// @notice Address of token (AERO) used to create a veNFT
    function token() external view returns (address);

    /// @notice Address of RewardsDistributor.sol
    function distributor() external view returns (address);

    /// @notice Address of Voter.sol
    function voter() external view returns (address);

    /// @notice Address of Protocol Team multisig
    function team() external view returns (address);

    /// @notice Address of art proxy used for on-chain art generation
    function artProxy() external view returns (address);

    /// @dev address which can create managed NFTs
    function allowedManager() external view returns (address);

    /// @dev Current count of token
    function tokenId() external view returns (uint256);

    /*///////////////////////////////////////////////////////////////
                            MANAGED NFT STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @dev Mapping of token id to escrow type
    ///      Takes advantage of the fact default value is EscrowType.NORMAL
    function escrowType(uint256 tokenId) external view returns (EscrowType);

    /// @dev Mapping of token id to managed id
    function idToManaged(uint256 tokenId) external view returns (uint256 managedTokenId);

    /// @dev Mapping of user token id to managed token id to weight of token id
    function weights(uint256 tokenId, uint256 managedTokenId) external view returns (uint256 weight);

    /// @dev Mapping of managed id to deactivated state
    function deactivated(uint256 tokenId) external view returns (bool inactive);

    /// @dev Mapping from managed nft id to locked managed rewards
    ///      `token` denominated rewards (rebases/rewards) stored in locked managed rewards contract
    ///      to prevent co-mingling of assets
    function managedToLocked(uint256 tokenId) external view returns (address);

    /// @dev Mapping from managed nft id to free managed rewards contract
    ///      these rewards can be freely withdrawn by users
    function managedToFree(uint256 tokenId) external view returns (address);

    /*///////////////////////////////////////////////////////////////
                            MANAGED NFT LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @notice Create managed NFT (a permanent lock) for use within ecosystem.
    /// @dev Throws if address already owns a managed NFT.
    /// @return _mTokenId managed token id.
    function createManagedLockFor(address _to) external returns (uint256 _mTokenId);

    /// @notice Delegates balance to managed nft
    ///         Note that NFTs deposited into a managed NFT will be re-locked
    ///         to the maximum lock time on withdrawal.
    ///         Permanent locks that are deposited will automatically unlock.
    /// @dev Managed nft will remain max-locked as long as there is at least one
    ///      deposit or withdrawal per week.
    ///      Throws if deposit nft is managed.
    ///      Throws if recipient nft is not managed.
    ///      Throws if deposit nft is already locked.
    ///      Throws if not called by voter.
    /// @param _tokenId tokenId of NFT being deposited
    /// @param _mTokenId tokenId of managed NFT that will receive the deposit
    function depositManaged(uint256 _tokenId, uint256 _mTokenId) external;

    /// @notice Retrieves locked rewards and withdraws balance from managed nft.
    ///         Note that the NFT withdrawn is re-locked to the maximum lock time.
    /// @dev Throws if NFT not locked.
    ///      Throws if not called by voter.
    /// @param _tokenId tokenId of NFT being deposited.
    function withdrawManaged(uint256 _tokenId) external;

    /// @notice Permit one address to call createManagedLockFor() that is not Voter.governor()
    function setAllowedManager(address _allowedManager) external;

    /// @notice Set Managed NFT state. Inactive NFTs cannot be deposited into.
    /// @param _mTokenId managed nft state to set
    /// @param _state true => inactive, false => active
    function setManagedState(uint256 _mTokenId, bool _state) external;

    /*///////////////////////////////////////////////////////////////
                             METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function version() external view returns (string memory);

    function decimals() external view returns (uint8);

    function setTeam(address _team) external;

    function setArtProxy(address _proxy) external;

    /// @inheritdoc IERC721Metadata
    function tokenURI(uint256 tokenId) external view returns (string memory);

    /*//////////////////////////////////////////////////////////////
                      ERC721 BALANCE/OWNER STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @dev Mapping from owner address to mapping of index to tokenId
    function ownerToNFTokenIdList(address _owner, uint256 _index) external view returns (uint256 _tokenId);

    /// @inheritdoc IERC721
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /// @inheritdoc IERC721
    function balanceOf(address owner) external view returns (uint256 balance);

    /*//////////////////////////////////////////////////////////////
                         ERC721 APPROVAL STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @inheritdoc IERC721
    function getApproved(uint256 _tokenId) external view returns (address operator);

    /// @inheritdoc IERC721
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /// @notice Check whether spender is owner or an approved user for a given veNFT
    /// @param _spender .
    /// @param _tokenId .
    function isApprovedOrOwner(address _spender, uint256 _tokenId) external returns (bool);

    /*//////////////////////////////////////////////////////////////
                              ERC721 LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @inheritdoc IERC721
    function approve(address to, uint256 tokenId) external;

    /// @inheritdoc IERC721
    function setApprovalForAll(address operator, bool approved) external;

    /// @inheritdoc IERC721
    function transferFrom(address from, address to, uint256 tokenId) external;

    /// @inheritdoc IERC721
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /// @inheritdoc IERC721
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @inheritdoc IERC165
    function supportsInterface(bytes4 _interfaceID) external view returns (bool);

    /*//////////////////////////////////////////////////////////////
                             ESCROW STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @notice Total count of epochs witnessed since contract creation
    function epoch() external view returns (uint256);

    /// @notice Total amount of token() deposited
    function supply() external view returns (uint256);

    /// @notice Aggregate permanent locked balances
    function permanentLockBalance() external view returns (uint256);

    function userPointEpoch(uint256 _tokenId) external view returns (uint256 _epoch);

    /// @notice time -> signed slope change
    function slopeChanges(uint256 _timestamp) external view returns (int128);

    /// @notice account -> can split
    function canSplit(address _account) external view returns (bool);

    /// @notice Global point history at a given index
    function pointHistory(uint256 _loc) external view returns (GlobalPoint memory);

    /// @notice Get the LockedBalance (amount, end) of a _tokenId
    /// @param _tokenId .
    /// @return LockedBalance of _tokenId
    function locked(uint256 _tokenId) external view returns (LockedBalance memory);

    /// @notice User -> UserPoint[userEpoch]
    function userPointHistory(uint256 _tokenId, uint256 _loc) external view returns (UserPoint memory);

    /*//////////////////////////////////////////////////////////////
                              ESCROW LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @notice Record global data to checkpoint
    function checkpoint() external;

    /// @notice Deposit `_value` tokens for `_tokenId` and add to the lock
    /// @dev Anyone (even a smart contract) can deposit for someone else, but
    ///      cannot extend their locktime and deposit for a brand new user
    /// @param _tokenId lock NFT
    /// @param _value Amount to add to user's lock
    function depositFor(uint256 _tokenId, uint256 _value) external;

    /// @notice Deposit `_value` tokens for `msg.sender` and lock for `_lockDuration`
    /// @param _value Amount to deposit
    /// @param _lockDuration Number of seconds to lock tokens for (rounded down to nearest week)
    /// @return TokenId of created veNFT
    function createLock(uint256 _value, uint256 _lockDuration) external returns (uint256);

    /// @notice Deposit `_value` tokens for `_to` and lock for `_lockDuration`
    /// @param _value Amount to deposit
    /// @param _lockDuration Number of seconds to lock tokens for (rounded down to nearest week)
    /// @param _to Address to deposit
    /// @return TokenId of created veNFT
    function createLockFor(uint256 _value, uint256 _lockDuration, address _to) external returns (uint256);

    /// @notice Deposit `_value` additional tokens for `_tokenId` without modifying the unlock time
    /// @param _value Amount of tokens to deposit and add to the lock
    function increaseAmount(uint256 _tokenId, uint256 _value) external;

    /// @notice Extend the unlock time for `_tokenId`
    ///         Cannot extend lock time of permanent locks
    /// @param _lockDuration New number of seconds until tokens unlock
    function increaseUnlockTime(uint256 _tokenId, uint256 _lockDuration) external;

    /// @notice Withdraw all tokens for `_tokenId`
    /// @dev Only possible if the lock is both expired and not permanent
    ///      This will burn the veNFT. Any rebases or rewards that are unclaimed
    ///      will no longer be claimable. Claim all rebases and rewards prior to calling this.
    function withdraw(uint256 _tokenId) external;

    /// @notice Merges `_from` into `_to`.
    /// @dev Cannot merge `_from` locks that are permanent or have already voted this epoch.
    ///      Cannot merge `_to` locks that have already expired.
    ///      This will burn the veNFT. Any rebases or rewards that are unclaimed
    ///      will no longer be claimable. Claim all rebases and rewards prior to calling this.
    /// @param _from VeNFT to merge from.
    /// @param _to VeNFT to merge into.
    function merge(uint256 _from, uint256 _to) external;

    /// @notice Splits veNFT into two new veNFTS - one with oldLocked.amount - `_amount`, and the second with `_amount`
    /// @dev    This burns the tokenId of the target veNFT
    ///         Callable by approved or owner
    ///         If this is called by approved, approved will not have permissions to manipulate the newly created veNFTs
    ///         Returns the two new split veNFTs to owner
    ///         If `from` is permanent, will automatically dedelegate.
    ///         This will burn the veNFT. Any rebases or rewards that are unclaimed
    ///         will no longer be claimable. Claim all rebases and rewards prior to calling this.
    /// @param _from VeNFT to split.
    /// @param _amount Amount to split from veNFT.
    /// @return _tokenId1 Return tokenId of veNFT with oldLocked.amount - `_amount`.
    /// @return _tokenId2 Return tokenId of veNFT with `_amount`.
    function split(uint256 _from, uint256 _amount) external returns (uint256 _tokenId1, uint256 _tokenId2);

    /// @notice Toggle split for a specific address.
    /// @dev Toggle split for address(0) to enable or disable for all.
    /// @param _account Address to toggle split permissions
    /// @param _bool True to allow, false to disallow
    function toggleSplit(address _account, bool _bool) external;

    /// @notice Permanently lock a veNFT. Voting power will be equal to
    ///         `LockedBalance.amount` with no decay. Required to delegate.
    /// @dev Only callable by unlocked normal veNFTs.
    /// @param _tokenId tokenId to lock.
    function lockPermanent(uint256 _tokenId) external;

    /// @notice Unlock a permanently locked veNFT. Voting power will decay.
    ///         Will automatically dedelegate if delegated.
    /// @dev Only callable by permanently locked veNFTs.
    ///      Cannot unlock if already voted this epoch.
    /// @param _tokenId tokenId to unlock.
    function unlockPermanent(uint256 _tokenId) external;

    /*///////////////////////////////////////////////////////////////
                           GAUGE VOTING STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @notice Get the voting power for _tokenId at the current timestamp
    /// @dev Returns 0 if called in the same block as a transfer.
    /// @param _tokenId .
    /// @return Voting power
    function balanceOfNFT(uint256 _tokenId) external view returns (uint256);

    /// @notice Get the voting power for _tokenId at a given timestamp
    /// @param _tokenId .
    /// @param _t Timestamp to query voting power
    /// @return Voting power
    function balanceOfNFTAt(uint256 _tokenId, uint256 _t) external view returns (uint256);

    /// @notice Calculate total voting power at current timestamp
    /// @return Total voting power at current timestamp
    function totalSupply() external view returns (uint256);

    /// @notice Calculate total voting power at a given timestamp
    /// @param _t Timestamp to query total voting power
    /// @return Total voting power at given timestamp
    function totalSupplyAt(uint256 _t) external view returns (uint256);

    /*///////////////////////////////////////////////////////////////
                            GAUGE VOTING LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @notice See if a queried _tokenId has actively voted
    /// @param _tokenId .
    /// @return True if voted, else false
    function voted(uint256 _tokenId) external view returns (bool);

    /// @notice Set the global state voter and distributor
    /// @dev This is only called once, at setup
    function setVoterAndDistributor(address _voter, address _distributor) external;

    /// @notice Set `voted` for _tokenId to true or false
    /// @dev Only callable by voter
    /// @param _tokenId .
    /// @param _voted .
    function voting(uint256 _tokenId, bool _voted) external;

    /*///////////////////////////////////////////////////////////////
                            DAO VOTING STORAGE
    //////////////////////////////////////////////////////////////*/

    /// @notice The number of checkpoints for each tokenId
    function numCheckpoints(uint256 tokenId) external view returns (uint48);

    /// @notice A record of states for signing / validating signatures
    function nonces(address account) external view returns (uint256);

    /// @inheritdoc IVotes
    function delegates(uint256 delegator) external view returns (uint256);

    /// @notice A record of delegated token checkpoints for each account, by index
    /// @param tokenId .
    /// @param index .
    /// @return Checkpoint
    function checkpoints(uint256 tokenId, uint48 index) external view returns (Checkpoint memory);

    /// @inheritdoc IVotes
    function getPastVotes(address account, uint256 tokenId, uint256 timestamp) external view returns (uint256);

    /// @inheritdoc IVotes
    function getPastTotalSupply(uint256 timestamp) external view returns (uint256);

    /*///////////////////////////////////////////////////////////////
                             DAO VOTING LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @inheritdoc IVotes
    function delegate(uint256 delegator, uint256 delegatee) external;

    /// @inheritdoc IVotes
    function delegateBySig(
        uint256 delegator,
        uint256 delegatee,
        uint256 nonce,
        uint256 expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /*//////////////////////////////////////////////////////////////
                              ERC6372 LOGIC
    //////////////////////////////////////////////////////////////*/

    /// @inheritdoc IERC6372
    function clock() external view returns (uint48);

    /// @inheritdoc IERC6372
    function CLOCK_MODE() external view returns (string memory);
}

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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "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: BUSL-1.1
pragma solidity 0.8.19;

library ProtocolTimeLibrary {
    uint256 internal constant WEEK = 7 days;

    /// @dev Returns start of epoch based on current timestamp
    function epochStart(uint256 timestamp) internal pure returns (uint256) {
        unchecked {
            return timestamp - (timestamp % WEEK);
        }
    }

    /// @dev Returns start of next epoch / end of current epoch
    function epochNext(uint256 timestamp) internal pure returns (uint256) {
        unchecked {
            return timestamp - (timestamp % WEEK) + WEEK;
        }
    }

    /// @dev Returns start of voting window
    function epochVoteStart(uint256 timestamp) internal pure returns (uint256) {
        unchecked {
            return timestamp - (timestamp % WEEK) + 1 hours;
        }
    }

    /// @dev Returns end of voting window / beginning of unrestricted voting window
    function epochVoteEnd(uint256 timestamp) internal pure returns (uint256) {
        unchecked {
            return timestamp - (timestamp % WEEK) + WEEK - 1 hours;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.19;

import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
import {IReward} from "../interfaces/IReward.sol";
import {IVoter} from "../interfaces/IVoter.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {ERC2771Context} from "@openzeppelin/contracts/metatx/ERC2771Context.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {ProtocolTimeLibrary} from "../libraries/ProtocolTimeLibrary.sol";

/// @title Reward
/// @author velodrome.finance, @figs999, @pegahcarter
/// @notice Base reward contract for distribution of rewards
abstract contract Reward is IReward, ERC2771Context, ReentrancyGuard {
    using SafeERC20 for IERC20;

    /// @inheritdoc IReward
    uint256 public constant DURATION = 7 days;

    /// @inheritdoc IReward
    address public immutable voter;
    /// @inheritdoc IReward
    address public immutable ve;
    /// @inheritdoc IReward
    address public authorized;

    /// @inheritdoc IReward
    uint256 public totalSupply;
    /// @inheritdoc IReward
    mapping(uint256 => uint256) public balanceOf;
    /// @inheritdoc IReward
    mapping(address => mapping(uint256 => uint256)) public tokenRewardsPerEpoch;
    /// @inheritdoc IReward
    mapping(address => mapping(uint256 => uint256)) public lastEarn;

    address[] public rewards;
    /// @inheritdoc IReward
    mapping(address => bool) public isReward;

    /// @notice A record of balance checkpoints for each account, by index
    mapping(uint256 => mapping(uint256 => Checkpoint)) public checkpoints;
    /// @inheritdoc IReward
    mapping(uint256 => uint256) public numCheckpoints;
    /// @notice A record of balance checkpoints for each token, by index
    mapping(uint256 => SupplyCheckpoint) public supplyCheckpoints;
    /// @inheritdoc IReward
    uint256 public supplyNumCheckpoints;

    constructor(address _forwarder, address _voter) ERC2771Context(_forwarder) {
        voter = _voter;
        ve = IVoter(_voter).ve();
    }

    /// @inheritdoc IReward
    function getPriorBalanceIndex(uint256 tokenId, uint256 timestamp) public view returns (uint256) {
        uint256 nCheckpoints = numCheckpoints[tokenId];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[tokenId][nCheckpoints - 1].timestamp <= timestamp) {
            return (nCheckpoints - 1);
        }

        // Next check implicit zero balance
        if (checkpoints[tokenId][0].timestamp > timestamp) {
            return 0;
        }

        uint256 lower = 0;
        uint256 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint256 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[tokenId][center];
            if (cp.timestamp == timestamp) {
                return center;
            } else if (cp.timestamp < timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return lower;
    }

    /// @inheritdoc IReward
    function getPriorSupplyIndex(uint256 timestamp) public view returns (uint256) {
        uint256 nCheckpoints = supplyNumCheckpoints;
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (supplyCheckpoints[nCheckpoints - 1].timestamp <= timestamp) {
            return (nCheckpoints - 1);
        }

        // Next check implicit zero balance
        if (supplyCheckpoints[0].timestamp > timestamp) {
            return 0;
        }

        uint256 lower = 0;
        uint256 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint256 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            SupplyCheckpoint memory cp = supplyCheckpoints[center];
            if (cp.timestamp == timestamp) {
                return center;
            } else if (cp.timestamp < timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return lower;
    }

    function _writeCheckpoint(uint256 tokenId, uint256 balance) internal {
        uint256 _nCheckPoints = numCheckpoints[tokenId];
        uint256 _timestamp = block.timestamp;

        if (
            _nCheckPoints > 0 &&
            ProtocolTimeLibrary.epochStart(checkpoints[tokenId][_nCheckPoints - 1].timestamp) ==
            ProtocolTimeLibrary.epochStart(_timestamp)
        ) {
            checkpoints[tokenId][_nCheckPoints - 1] = Checkpoint(_timestamp, balance);
        } else {
            checkpoints[tokenId][_nCheckPoints] = Checkpoint(_timestamp, balance);
            numCheckpoints[tokenId] = _nCheckPoints + 1;
        }
    }

    function _writeSupplyCheckpoint() internal {
        uint256 _nCheckPoints = supplyNumCheckpoints;
        uint256 _timestamp = block.timestamp;

        if (
            _nCheckPoints > 0 &&
            ProtocolTimeLibrary.epochStart(supplyCheckpoints[_nCheckPoints - 1].timestamp) ==
            ProtocolTimeLibrary.epochStart(_timestamp)
        ) {
            supplyCheckpoints[_nCheckPoints - 1] = SupplyCheckpoint(_timestamp, totalSupply);
        } else {
            supplyCheckpoints[_nCheckPoints] = SupplyCheckpoint(_timestamp, totalSupply);
            supplyNumCheckpoints = _nCheckPoints + 1;
        }
    }

    /// @inheritdoc IReward
    function rewardsListLength() external view returns (uint256) {
        return rewards.length;
    }

    /// @inheritdoc IReward
    function earned(address token, uint256 tokenId) public view returns (uint256) {
        if (numCheckpoints[tokenId] == 0) {
            return 0;
        }

        uint256 reward = 0;
        uint256 _supply = 1;
        uint256 _currTs = ProtocolTimeLibrary.epochStart(lastEarn[token][tokenId]); // take epoch last claimed in as starting point
        uint256 _index = getPriorBalanceIndex(tokenId, _currTs);
        Checkpoint memory cp0 = checkpoints[tokenId][_index];

        // accounts for case where lastEarn is before first checkpoint
        _currTs = Math.max(_currTs, ProtocolTimeLibrary.epochStart(cp0.timestamp));

        // get epochs between current epoch and first checkpoint in same epoch as last claim
        uint256 numEpochs = (ProtocolTimeLibrary.epochStart(block.timestamp) - _currTs) / DURATION;

        if (numEpochs > 0) {
            for (uint256 i = 0; i < numEpochs; i++) {
                // get index of last checkpoint in this epoch
                _index = getPriorBalanceIndex(tokenId, _currTs + DURATION - 1);
                // get checkpoint in this epoch
                cp0 = checkpoints[tokenId][_index];
                // get supply of last checkpoint in this epoch
                _supply = Math.max(supplyCheckpoints[getPriorSupplyIndex(_currTs + DURATION - 1)].supply, 1);
                reward += (cp0.balanceOf * tokenRewardsPerEpoch[token][_currTs]) / _supply;
                _currTs += DURATION;
            }
        }

        return reward;
    }

    /// @inheritdoc IReward
    function _deposit(uint256 amount, uint256 tokenId) external {
        address sender = _msgSender();
        if (sender != authorized) revert NotAuthorized();

        totalSupply += amount;
        balanceOf[tokenId] += amount;

        _writeCheckpoint(tokenId, balanceOf[tokenId]);
        _writeSupplyCheckpoint();

        emit Deposit(sender, tokenId, amount);
    }

    /// @inheritdoc IReward
    function _withdraw(uint256 amount, uint256 tokenId) external {
        address sender = _msgSender();
        if (sender != authorized) revert NotAuthorized();

        totalSupply -= amount;
        balanceOf[tokenId] -= amount;

        _writeCheckpoint(tokenId, balanceOf[tokenId]);
        _writeSupplyCheckpoint();

        emit Withdraw(sender, tokenId, amount);
    }

    /// @inheritdoc IReward
    function getReward(uint256 tokenId, address[] memory tokens) external virtual nonReentrant {}

    /// @dev used with all getReward implementations
    function _getReward(address recipient, uint256 tokenId, address[] memory tokens) internal {
        uint256 _length = tokens.length;
        for (uint256 i = 0; i < _length; i++) {
            uint256 _reward = earned(tokens[i], tokenId);
            lastEarn[tokens[i]][tokenId] = block.timestamp;
            if (_reward > 0) IERC20(tokens[i]).safeTransfer(recipient, _reward);

            emit ClaimRewards(recipient, tokens[i], _reward);
        }
    }

    /// @inheritdoc IReward
    function notifyRewardAmount(address token, uint256 amount) external virtual nonReentrant {}

    /// @dev used within all notifyRewardAmount implementations
    function _notifyRewardAmount(address sender, address token, uint256 amount) internal {
        if (amount == 0) revert ZeroAmount();
        IERC20(token).safeTransferFrom(sender, address(this), amount);

        uint256 epochStart = ProtocolTimeLibrary.epochStart(block.timestamp);
        tokenRewardsPerEpoch[token][epochStart] += amount;

        emit NotifyReward(sender, token, epochStart, amount);
    }
}

// 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/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: BUSL-1.1
pragma solidity 0.8.19;

import {Reward} from "./Reward.sol";
import {IVotingEscrow} from "../interfaces/IVotingEscrow.sol";

/// @title Base voting reward contract for distribution of rewards by token id
///        on a weekly basis
abstract contract VotingReward is Reward {
    constructor(address _forwarder, address _voter, address[] memory _rewards) Reward(_forwarder, _voter) {
        uint256 _length = _rewards.length;
        for (uint256 i; i < _length; i++) {
            if (_rewards[i] != address(0)) {
                isReward[_rewards[i]] = true;
                rewards.push(_rewards[i]);
            }
        }

        authorized = _voter;
    }

    /// @inheritdoc Reward
    function getReward(uint256 tokenId, address[] memory tokens) external override nonReentrant {
        address sender = _msgSender();
        if (!IVotingEscrow(ve).isApprovedOrOwner(sender, tokenId) && sender != voter) revert NotAuthorized();

        address _owner = IVotingEscrow(ve).ownerOf(tokenId);
        _getReward(_owner, tokenId, tokens);
    }

    /// @inheritdoc Reward
    function notifyRewardAmount(address token, uint256 amount) external virtual override {}
}

{
  "compilationTarget": {
    "contracts/rewards/FeesVotingReward.sol": "FeesVotingReward"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":@opengsn/=lib/gsn/packages/",
    ":@openzeppelin/=lib/openzeppelin-contracts/",
    ":@uniswap/v3-core/=lib/v3-core/",
    ":ds-test/=lib/ds-test/src/",
    ":erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    ":eth-gas-reporter/=node_modules/eth-gas-reporter/",
    ":forge-std/=lib/forge-std/src/",
    ":gsn/=lib/gsn/",
    ":hardhat-deploy/=node_modules/hardhat-deploy/",
    ":hardhat/=node_modules/hardhat/",
    ":openzeppelin-contracts/=lib/openzeppelin-contracts/",
    ":utils/=test/utils/",
    ":v3-core/=lib/v3-core/"
  ]
}