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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Receiver.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import "./DateTime.sol";

/* ========== ERRORS ========== */

library Errors {
  string internal constant InvalidTimestamp = "invalid timestamp";
  string internal constant InvalidInput = "invalid input provided";
  string internal constant NoVestingSchedule =
    "sender has not been registered for a vesting schedule";
  string internal constant InsufficientTokenBalance =
    "contract does not have enough tokens to distribute";
}

/* ========== DATA STRUCTURES ========== */

// @notice A vesting schedule for an individual address.
struct VestingSchedule {
  uint256 lastClaim;
  uint16 monthsRemaining;
  uint32 tokensPerMonth;
}

contract Vesting is Ownable, ERC1155Receiver {
  /* ========== EVENTS ========== */

  event VestingTokensGranted(
    address indexed to,
    uint256 totalMonths,
    uint256 tokensPerMonth
  );
  event VestedTokensClaimed(
    address indexed by,
    uint256 monthsClaimed,
    uint256 amount
  );
  event VestingTokensRevoked(address indexed from);
  event RewardTokenSet(address tokenAddress, uint256 tokenId);
  event TokensWithdrawnFromContract(address indexed to, uint256 amount);

  /* ========== STATE VARIABLES ========== */

  address private _tokenAddress;
  uint256 private _tokenId;

  mapping(address => VestingSchedule) private _vestingSchedules;

  /* ========== CONSTRUCTOR ========== */

  constructor(address tokenAddress, uint256 tokenId) ERC1155Receiver() {
    _tokenAddress = tokenAddress;
    _tokenId = tokenId;
  }

  /* ========== MUTATIVE FUNCTIONS ========== */

  // @notice Claim your vested tokens since last claiming timestamp.
  function claimTokens() external returns (uint256 tokensToClaim) {
    VestingSchedule storage userVestingSchedule = _vestingSchedules[msg.sender];

    uint256 monthsPassed = DateTime.diffMonths(
      _vestingSchedules[msg.sender].lastClaim,
      block.timestamp
    );

    // use uint16 because we can not claim more than the months remaining. avoid overflow later when assumptions are more complex.
    // explicit conversion here should be fine, since we already min() with a upscaled uint16 (monthsRemaining), so the range should fall within a single uint16
    uint16 monthsClaimed = uint16(
      Math.min(userVestingSchedule.monthsRemaining, monthsPassed)
    );

    if (monthsClaimed == 0) {
      return 0;
    } else {
      tokensToClaim =
        uint256(userVestingSchedule.tokensPerMonth) *
        monthsClaimed;
    }

    IERC1155 token = IERC1155(_tokenAddress);
    require(
      token.balanceOf(address(this), _tokenId) >= tokensToClaim,
      Errors.InsufficientTokenBalance
    );

    _vestingSchedules[msg.sender].lastClaim = block.timestamp;
    _vestingSchedules[msg.sender].monthsRemaining =
      _vestingSchedules[msg.sender].monthsRemaining -
      monthsClaimed;

    token.safeTransferFrom(
      address(this),
      msg.sender,
      _tokenId,
      tokensToClaim,
      "Claiming vested tokens"
    );
    emit VestedTokensClaimed(msg.sender, monthsClaimed, tokensToClaim);
  }

  // @notice Grant vesting tokens to a specified address.
  // @param toGrant Address to receive tokens on a vesting schedule.
  // @param numberOfMonths Number of months to grant tokens for.
  // @param tokensPerMonth Number of tokens to grant per month.
  function grantVestingTokens(
    address toGrant,
    uint16 numberOfMonths,
    uint32 tokensPerMonth
  ) external onlyOwner {
    require(toGrant != address(0), Errors.InvalidInput);
    _vestingSchedules[toGrant] = VestingSchedule(
      block.timestamp,
      numberOfMonths,
      tokensPerMonth
    );
    emit VestingTokensGranted(toGrant, numberOfMonths, tokensPerMonth);
  }

  // @notice Owner can withdraw tokens deposited into the contract.
  // @param count The number of tokens to withdraw.
  function withdrawTokens(uint256 count) external onlyOwner {
    IERC1155 token = IERC1155(_tokenAddress);
    require(
      token.balanceOf(address(this), _tokenId) >= count,
      Errors.InsufficientTokenBalance
    );

    token.safeTransferFrom(
      address(this),
      msg.sender,
      _tokenId,
      count,
      "Withdrawing tokens"
    );

    emit TokensWithdrawnFromContract(msg.sender, count);
  }

  // @notice Revoke vesting tokens from specified address.
  // @param revokeAddress The address to revoke tokens from.
  function revokeVestingTokens(address revokeAddress) external onlyOwner {
    _vestingSchedules[revokeAddress].tokensPerMonth = 0;
    _vestingSchedules[revokeAddress].monthsRemaining = 0;
    emit VestingTokensRevoked(revokeAddress);
  }

  /*
   * @notice Set the token to be used for vesting rewards.
   * @dev Token must implement ERC1155.
   * @param tokenAddress The address of the token contract.
   * @param tokenId The id of the token.
   */
  function setToken(address tokenAddress, uint256 id) external onlyOwner {
    _tokenAddress = tokenAddress;
    _tokenId = id;
    emit RewardTokenSet(tokenAddress, id);
  }

  /* ========== VIEW FUNCTIONS ========== */

  /*
   * @notice Get the vested token address and ID.
   */
  function getToken() external view returns (address, uint256) {
    return (_tokenAddress, _tokenId);
  }

  /*
   * @notice Get the vesting schedule for a specified address.
   * @param addr The address to get the schedule for.
   */
  function getVestingSchedule(address addr)
    external
    view
    returns (
      uint256 timestamp,
      uint16 monthsRemaining,
      uint32 tokensPerMonth
    )
  {
    VestingSchedule storage _vestingSchedule = _vestingSchedules[addr];
    return (
      _vestingSchedule.lastClaim,
      _vestingSchedule.monthsRemaining,
      _vestingSchedule.tokensPerMonth
    );
  }

  function onERC1155Received(
    address operator,
    address from,
    uint256 id,
    uint256 value,
    bytes calldata data
  ) external pure override returns (bytes4) {
    return
      bytes4(
        keccak256("onERC1155Received(address,address,uint256,uint256,bytes)")
      );
  }

  function onERC1155BatchReceived(
    address operator,
    address from,
    uint256[] calldata ids,
    uint256[] calldata values,
    bytes calldata data
  ) external pure override returns (bytes4) {
    return
      bytes4(
        keccak256("onERC1155Received(address,address,uint256,uint256,bytes)")
      );
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/utils/ERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "../IERC1155Receiver.sol";
import "../../../utils/introspection/ERC165.sol";

/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @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 / b + (a % b == 0 ? 0 : 1);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.9.0;

// ----------------------------------------------------------------------------
// BokkyPooBah's DateTime Library v1.01
//
// A gas-efficient Solidity date and time library
//
// https://github.com/bokkypoobah/BokkyPooBahsDateTimeLibrary
//
// Tested date range 1970/01/01 to 2345/12/31
//
// Conventions:
// Unit      | Range         | Notes
// :-------- |:-------------:|:-----
// timestamp | >= 0          | Unix timestamp, number of seconds since 1970/01/01 00:00:00 UTC
// year      | 1970 ... 2345 |
// month     | 1 ... 12      |
// day       | 1 ... 31      |
// hour      | 0 ... 23      |
// minute    | 0 ... 59      |
// second    | 0 ... 59      |
// dayOfWeek | 1 ... 7       | 1 = Monday, ..., 7 = Sunday
//
//
// Enjoy. (c) BokkyPooBah / Bok Consulting Pty Ltd 2018-2019. The MIT Licence.
// ----------------------------------------------------------------------------

library DateTime {
  uint256 constant SECONDS_PER_DAY = 24 * 60 * 60;
  uint256 constant SECONDS_PER_HOUR = 60 * 60;
  uint256 constant SECONDS_PER_MINUTE = 60;
  int256 constant OFFSET19700101 = 2440588;

  uint256 constant DOW_MON = 1;
  uint256 constant DOW_TUE = 2;
  uint256 constant DOW_WED = 3;
  uint256 constant DOW_THU = 4;
  uint256 constant DOW_FRI = 5;
  uint256 constant DOW_SAT = 6;
  uint256 constant DOW_SUN = 7;

  // ------------------------------------------------------------------------
  // Calculate the number of days from 1970/01/01 to year/month/day using
  // the date conversion algorithm from
  //   http://aa.usno.navy.mil/faq/docs/JD_Formula.php
  // and subtracting the offset 2440588 so that 1970/01/01 is day 0
  //
  // days = day
  //      - 32075
  //      + 1461 * (year + 4800 + (month - 14) / 12) / 4
  //      + 367 * (month - 2 - (month - 14) / 12 * 12) / 12
  //      - 3 * ((year + 4900 + (month - 14) / 12) / 100) / 4
  //      - offset
  // ------------------------------------------------------------------------
  function _daysFromDate(
    uint256 year,
    uint256 month,
    uint256 day
  ) internal pure returns (uint256 _days) {
    // require(year >= 1970);
    int256 _year = int256(year);
    int256 _month = int256(month);
    int256 _day = int256(day);

    int256 __days = _day -
      32075 +
      (1461 * (_year + 4800 + (_month - 14) / 12)) /
      4 +
      (367 * (_month - 2 - ((_month - 14) / 12) * 12)) /
      12 -
      (3 * ((_year + 4900 + (_month - 14) / 12) / 100)) /
      4 -
      OFFSET19700101;

    _days = uint256(__days);
  }

  // ------------------------------------------------------------------------
  // Calculate year/month/day from the number of days since 1970/01/01 using
  // the date conversion algorithm from
  //   http://aa.usno.navy.mil/faq/docs/JD_Formula.php
  // and adding the offset 2440588 so that 1970/01/01 is day 0
  //
  // int L = days + 68569 + offset
  // int N = 4 * L / 146097
  // L = L - (146097 * N + 3) / 4
  // year = 4000 * (L + 1) / 1461001
  // L = L - 1461 * year / 4 + 31
  // month = 80 * L / 2447
  // dd = L - 2447 * month / 80
  // L = month / 11
  // month = month + 2 - 12 * L
  // year = 100 * (N - 49) + year + L
  // ------------------------------------------------------------------------
  function _daysToDate(uint256 _days)
    internal
    pure
    returns (
      uint256 year,
      uint256 month,
      uint256 day
    )
  {
    int256 __days = int256(_days);

    int256 L = __days + 68569 + OFFSET19700101;
    int256 N = (4 * L) / 146097;
    L = L - (146097 * N + 3) / 4;
    int256 _year = (4000 * (L + 1)) / 1461001;
    L = L - (1461 * _year) / 4 + 31;
    int256 _month = (80 * L) / 2447;
    int256 _day = L - (2447 * _month) / 80;
    L = _month / 11;
    _month = _month + 2 - 12 * L;
    _year = 100 * (N - 49) + _year + L;

    year = uint256(_year);
    month = uint256(_month);
    day = uint256(_day);
  }

  function timestampFromDate(
    uint256 year,
    uint256 month,
    uint256 day
  ) internal pure returns (uint256 timestamp) {
    timestamp = _daysFromDate(year, month, day) * SECONDS_PER_DAY;
  }

  function timestampFromDateTime(
    uint256 year,
    uint256 month,
    uint256 day,
    uint256 hour,
    uint256 minute,
    uint256 second
  ) internal pure returns (uint256 timestamp) {
    timestamp =
      _daysFromDate(year, month, day) *
      SECONDS_PER_DAY +
      hour *
      SECONDS_PER_HOUR +
      minute *
      SECONDS_PER_MINUTE +
      second;
  }

  function timestampToDate(uint256 timestamp)
    internal
    pure
    returns (
      uint256 year,
      uint256 month,
      uint256 day
    )
  {
    (year, month, day) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }

  function timestampToDateTime(uint256 timestamp)
    internal
    pure
    returns (
      uint256 year,
      uint256 month,
      uint256 day,
      uint256 hour,
      uint256 minute,
      uint256 second
    )
  {
    (year, month, day) = _daysToDate(timestamp / SECONDS_PER_DAY);
    uint256 secs = timestamp % SECONDS_PER_DAY;
    hour = secs / SECONDS_PER_HOUR;
    secs = secs % SECONDS_PER_HOUR;
    minute = secs / SECONDS_PER_MINUTE;
    second = secs % SECONDS_PER_MINUTE;
  }

  function isValidDate(
    uint256 year,
    uint256 month,
    uint256 day
  ) internal pure returns (bool valid) {
    if (year >= 1970 && month > 0 && month <= 12) {
      uint256 daysInMonth = _getDaysInMonth(year, month);
      if (day > 0 && day <= daysInMonth) {
        valid = true;
      }
    }
  }

  function isValidDateTime(
    uint256 year,
    uint256 month,
    uint256 day,
    uint256 hour,
    uint256 minute,
    uint256 second
  ) internal pure returns (bool valid) {
    if (isValidDate(year, month, day)) {
      if (hour < 24 && minute < 60 && second < 60) {
        valid = true;
      }
    }
  }

  function isLeapYear(uint256 timestamp) internal pure returns (bool leapYear) {
    (uint256 year, , ) = _daysToDate(timestamp / SECONDS_PER_DAY);
    leapYear = _isLeapYear(year);
  }

  function _isLeapYear(uint256 year) internal pure returns (bool leapYear) {
    leapYear = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
  }

  function isWeekDay(uint256 timestamp) internal pure returns (bool weekDay) {
    weekDay = getDayOfWeek(timestamp) <= DOW_FRI;
  }

  function isWeekEnd(uint256 timestamp) internal pure returns (bool weekEnd) {
    weekEnd = getDayOfWeek(timestamp) >= DOW_SAT;
  }

  function getDaysInMonth(uint256 timestamp)
    internal
    pure
    returns (uint256 daysInMonth)
  {
    (uint256 year, uint256 month, ) = _daysToDate(timestamp / SECONDS_PER_DAY);
    daysInMonth = _getDaysInMonth(year, month);
  }

  function _getDaysInMonth(uint256 year, uint256 month)
    internal
    pure
    returns (uint256 daysInMonth)
  {
    if (
      month == 1 ||
      month == 3 ||
      month == 5 ||
      month == 7 ||
      month == 8 ||
      month == 10 ||
      month == 12
    ) {
      daysInMonth = 31;
    } else if (month != 2) {
      daysInMonth = 30;
    } else {
      daysInMonth = _isLeapYear(year) ? 29 : 28;
    }
  }

  // 1 = Monday, 7 = Sunday
  function getDayOfWeek(uint256 timestamp)
    internal
    pure
    returns (uint256 dayOfWeek)
  {
    uint256 _days = timestamp / SECONDS_PER_DAY;
    dayOfWeek = ((_days + 3) % 7) + 1;
  }

  function getYear(uint256 timestamp) internal pure returns (uint256 year) {
    (year, , ) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }

  function getMonth(uint256 timestamp) internal pure returns (uint256 month) {
    (, month, ) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }

  function getDay(uint256 timestamp) internal pure returns (uint256 day) {
    (, , day) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }

  function getHour(uint256 timestamp) internal pure returns (uint256 hour) {
    uint256 secs = timestamp % SECONDS_PER_DAY;
    hour = secs / SECONDS_PER_HOUR;
  }

  function getMinute(uint256 timestamp) internal pure returns (uint256 minute) {
    uint256 secs = timestamp % SECONDS_PER_HOUR;
    minute = secs / SECONDS_PER_MINUTE;
  }

  function getSecond(uint256 timestamp) internal pure returns (uint256 second) {
    second = timestamp % SECONDS_PER_MINUTE;
  }

  function addYears(uint256 timestamp, uint256 _years)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    (uint256 year, uint256 month, uint256 day) = _daysToDate(
      timestamp / SECONDS_PER_DAY
    );
    year += _years;
    uint256 daysInMonth = _getDaysInMonth(year, month);
    if (day > daysInMonth) {
      day = daysInMonth;
    }
    newTimestamp =
      _daysFromDate(year, month, day) *
      SECONDS_PER_DAY +
      (timestamp % SECONDS_PER_DAY);
    require(newTimestamp >= timestamp);
  }

  function addMonths(uint256 timestamp, uint256 _months)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    (uint256 year, uint256 month, uint256 day) = _daysToDate(
      timestamp / SECONDS_PER_DAY
    );
    month += _months;
    year += (month - 1) / 12;
    month = ((month - 1) % 12) + 1;
    uint256 daysInMonth = _getDaysInMonth(year, month);
    if (day > daysInMonth) {
      day = daysInMonth;
    }
    newTimestamp =
      _daysFromDate(year, month, day) *
      SECONDS_PER_DAY +
      (timestamp % SECONDS_PER_DAY);
    require(newTimestamp >= timestamp);
  }

  function addDays(uint256 timestamp, uint256 _days)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp + _days * SECONDS_PER_DAY;
    require(newTimestamp >= timestamp);
  }

  function addHours(uint256 timestamp, uint256 _hours)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp + _hours * SECONDS_PER_HOUR;
    require(newTimestamp >= timestamp);
  }

  function addMinutes(uint256 timestamp, uint256 _minutes)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp + _minutes * SECONDS_PER_MINUTE;
    require(newTimestamp >= timestamp);
  }

  function addSeconds(uint256 timestamp, uint256 _seconds)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp + _seconds;
    require(newTimestamp >= timestamp);
  }

  function subYears(uint256 timestamp, uint256 _years)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    (uint256 year, uint256 month, uint256 day) = _daysToDate(
      timestamp / SECONDS_PER_DAY
    );
    year -= _years;
    uint256 daysInMonth = _getDaysInMonth(year, month);
    if (day > daysInMonth) {
      day = daysInMonth;
    }
    newTimestamp =
      _daysFromDate(year, month, day) *
      SECONDS_PER_DAY +
      (timestamp % SECONDS_PER_DAY);
    require(newTimestamp <= timestamp);
  }

  function subMonths(uint256 timestamp, uint256 _months)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    (uint256 year, uint256 month, uint256 day) = _daysToDate(
      timestamp / SECONDS_PER_DAY
    );
    uint256 yearMonth = year * 12 + (month - 1) - _months;
    year = yearMonth / 12;
    month = (yearMonth % 12) + 1;
    uint256 daysInMonth = _getDaysInMonth(year, month);
    if (day > daysInMonth) {
      day = daysInMonth;
    }
    newTimestamp =
      _daysFromDate(year, month, day) *
      SECONDS_PER_DAY +
      (timestamp % SECONDS_PER_DAY);
    require(newTimestamp <= timestamp);
  }

  function subDays(uint256 timestamp, uint256 _days)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp - _days * SECONDS_PER_DAY;
    require(newTimestamp <= timestamp);
  }

  function subHours(uint256 timestamp, uint256 _hours)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp - _hours * SECONDS_PER_HOUR;
    require(newTimestamp <= timestamp);
  }

  function subMinutes(uint256 timestamp, uint256 _minutes)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp - _minutes * SECONDS_PER_MINUTE;
    require(newTimestamp <= timestamp);
  }

  function subSeconds(uint256 timestamp, uint256 _seconds)
    internal
    pure
    returns (uint256 newTimestamp)
  {
    newTimestamp = timestamp - _seconds;
    require(newTimestamp <= timestamp);
  }

  function diffYears(uint256 fromTimestamp, uint256 toTimestamp)
    internal
    pure
    returns (uint256 _years)
  {
    require(fromTimestamp <= toTimestamp);
    (uint256 fromYear, , ) = _daysToDate(fromTimestamp / SECONDS_PER_DAY);
    (uint256 toYear, , ) = _daysToDate(toTimestamp / SECONDS_PER_DAY);
    _years = toYear - fromYear;
  }

  function diffMonths(uint256 fromTimestamp, uint256 toTimestamp)
    internal
    pure
    returns (uint256 _months)
  {
    require(fromTimestamp <= toTimestamp);
    (uint256 fromYear, uint256 fromMonth, ) = _daysToDate(
      fromTimestamp / SECONDS_PER_DAY
    );
    (uint256 toYear, uint256 toMonth, ) = _daysToDate(
      toTimestamp / SECONDS_PER_DAY
    );
    _months = toYear * 12 + toMonth - fromYear * 12 - fromMonth;
  }

  function diffDays(uint256 fromTimestamp, uint256 toTimestamp)
    internal
    pure
    returns (uint256 _days)
  {
    require(fromTimestamp <= toTimestamp);
    _days = (toTimestamp - fromTimestamp) / SECONDS_PER_DAY;
  }

  function diffHours(uint256 fromTimestamp, uint256 toTimestamp)
    internal
    pure
    returns (uint256 _hours)
  {
    require(fromTimestamp <= toTimestamp);
    _hours = (toTimestamp - fromTimestamp) / SECONDS_PER_HOUR;
  }

  function diffMinutes(uint256 fromTimestamp, uint256 toTimestamp)
    internal
    pure
    returns (uint256 _minutes)
  {
    require(fromTimestamp <= toTimestamp);
    _minutes = (toTimestamp - fromTimestamp) / SECONDS_PER_MINUTE;
  }

  function diffSeconds(uint256 fromTimestamp, uint256 toTimestamp)
    internal
    pure
    returns (uint256 _seconds)
  {
    require(fromTimestamp <= toTimestamp);
    _seconds = toTimestamp - fromTimestamp;
  }
}

// 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 v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000007eef591a6cc0403b9652e98e88476fe1bf31ddeb000000000000000000000000000000000000000000000000000000000000002a

-----Decoded View---------------
Arg [0] : tokenAddress (address): 0x7EeF591A6CC0403b9652E98E88476fe1bF31dDeb
Arg [1] : tokenId (uint256): 42

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000007eef591a6cc0403b9652e98e88476fe1bf31ddeb
Arg [1] : 000000000000000000000000000000000000000000000000000000000000002a