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// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./PapparicoTreasury.sol";
import "./PapparicoFrequentPlayerPoints.sol";
import "./IPapparicoPayable.sol";
import "./lib/PayableUtils.sol";
import "./lib/DateUtils.sol";

contract PapparicoSingleStaking is AccessControl, ReentrancyGuard, IPapparicoPayable {

  using SafeERC20 for IERC20;
  using SafeMath for uint256;

  bytes32 constant OPERATOR = keccak256("OPERATOR");

  uint256 constant HPERC = 1e4;

  enum LockType {
    NONE,
    MINUTES,
    HOURS,
    DAYS,
    MONTHS
  }

  struct Pool {
    uint256 poolId;
    uint256 fppFirstTime;
    bool isInitialized;
    LockType lockType;
    uint256 timeAmountLocked;
    uint256 withdrawalFee;
    uint256 startTime;
    IERC20 stakingAddress;
  }

  struct RewardingTokenEmissionParams {
    IERC20 rewardToken;
    uint256 digits;
    uint256 precision;
    uint256 emission;
    uint256 emissionPrecision;
    uint256 multiplier;
    uint256 rewardEmissionPerSecond;
  }

  struct UserStaking {
    uint256 idCounter;
    address[] users;
    mapping(address => uint256) userIds;
    mapping(address => UserStakingData) userStakes;
    uint256 totalStakedAllUsers;
  }

  struct UserStakingData {
    uint256 lockedUntil;
    uint256 stakes;
  }

  struct UserReward {
    uint256 finishAt;
    uint256 currentRewardPerToken;
    uint256 lastUpdateTime;
    uint256 totalClaimed;
  }

  struct UserRewardOutput {
    IERC20 rewardToken;
    uint256 lastUpdateTime;
    uint256 finishAt;
    bool isFinished;
    uint256 decimal;
    uint256 rewards;
    uint256 totalClaimed;
  }

  struct SupplyReward {
    IERC20 rewardToken;
    uint256 rewards;
  }

  mapping(uint256 => Pool) public pools;
  mapping(uint256 => UserStaking) public poolUserStakes;
  mapping(uint256 => IERC20[]) public poolRewardingTokensAddresses;
  mapping(uint256 => uint256[]) public poolRewardingTokensDecimals;
  mapping(uint256 => mapping(IERC20 => RewardingTokenEmissionParams)) public poolRewardingTokensEmissionParams;
  mapping(uint256 => mapping(IERC20 => UserReward)) public poolUserRewards;
  mapping(uint256 => mapping(IERC20 => mapping(address => uint256))) public userCurrentRewards;
  mapping(uint256 => mapping(IERC20 => mapping(address => uint256))) public userRewardsPerTokenPaid;
  mapping(uint256 => mapping(IERC20 => mapping(address => uint256))) public userTotalClaimed;

  PapparicoTreasury private immutable papparicoTreasury;
  PapparicoFrequentPlayerPoints private immutable frequentPoints;

  constructor(PapparicoTreasury _papparicoTreasury, PapparicoFrequentPlayerPoints _frequentPoints) {

    _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    _grantRole(OPERATOR, msg.sender);

    papparicoTreasury = _papparicoTreasury;
    frequentPoints = _frequentPoints;
  }

  function createPool(uint256 _id, Pool memory _pool, IERC20[] memory rewardingTokenAddresses, uint256[] memory rewardingTokenDecimals, 
    RewardingTokenEmissionParams[] memory rewardingParams) external validatePoolCreation(_id, _pool, rewardingTokenAddresses, rewardingParams) onlyAdmin() {
    pools[_id] = _pool;
    pools[_id].poolId = _id;

    for (uint8 i; i < rewardingTokenAddresses.length; ++i) {
      IERC20 rewardToken = rewardingTokenAddresses[i];
      uint256 decimal = rewardingTokenDecimals[i];
      poolRewardingTokensAddresses[_id].push(rewardToken);
      poolRewardingTokensDecimals[_id].push(decimal);
      RewardingTokenEmissionParams memory params = rewardingParams[i];
      setEmissionParams(_id, rewardToken, params);
    }
  }

  function resetRewardingEmissionParams(uint256 _id, RewardingTokenEmissionParams[] memory rewardingParams) external validatePoolExists(_id) onlyAdmin() {
    require(!isEmissionsStarted(_id), "EmSt");
    for (uint8 i; i < rewardingParams.length; ++i) {
      IERC20 rewardToken = rewardingParams[i].rewardToken;
      RewardingTokenEmissionParams memory params = rewardingParams[i];
      setEmissionParams(_id, rewardToken, params);
    }
  }

  function setEmissionParams(uint256 _id, IERC20 rewardToken, RewardingTokenEmissionParams memory rewardingParams) private onlyAdmin() {
    poolRewardingTokensEmissionParams[_id][rewardToken].rewardToken = rewardingParams.rewardToken;
    poolRewardingTokensEmissionParams[_id][rewardToken].digits = rewardingParams.digits;
    poolRewardingTokensEmissionParams[_id][rewardToken].precision = rewardingParams.precision;
    poolRewardingTokensEmissionParams[_id][rewardToken].emission = rewardingParams.emission;
    poolRewardingTokensEmissionParams[_id][rewardToken].emissionPrecision = rewardingParams.emissionPrecision;
    poolRewardingTokensEmissionParams[_id][rewardToken].multiplier = rewardingParams.multiplier;
    poolRewardingTokensEmissionParams[_id][rewardToken].rewardEmissionPerSecond = rewardingParams.rewardEmissionPerSecond;
  }

  function initializePool(uint256 _id, uint256 _startTime) external validateInitialize(_id, _startTime) onlyOperator() {

    pools[_id].isInitialized = true;
    pools[_id].startTime = _startTime;
    uint256 rewardTokensLength = poolRewardingTokensAddresses[_id].length;
    uint256 lastTime = _startTime;

    for (uint8 i; i < rewardTokensLength; ++i) {
      IERC20 rewardToken = poolRewardingTokensAddresses[_id][i];
      poolUserRewards[_id][rewardToken].lastUpdateTime = lastTime;
      poolUserRewards[_id][rewardToken].finishAt = 0;
    }
  }

  function supplyRewards(uint256 _id, SupplyReward[] memory rewardsArray) public validatePoolExists(_id) onlyOperator() {
    uint256 arrayLength = rewardsArray.length;
    for (uint8 i; i < arrayLength; ++i) {
      IERC20 rewardToken = rewardsArray[i].rewardToken;
      uint256 rewards = rewardsArray[i].rewards;
      updateAll(_id);

      uint256 finishAt = poolUserRewards[_id][rewardToken].finishAt;
      uint256 duration;
      if (block.timestamp >= finishAt) {
        duration = calculateDuration(_id, rewardToken, rewards);
      } else {
        uint256 emissionPrecision = poolRewardingTokensEmissionParams[_id][rewardToken].emissionPrecision;
        uint256 digits = poolRewardingTokensEmissionParams[_id][rewardToken].digits;
        uint256 rewardRate = calculateRewardRate(_id, rewardToken);
        uint256 remainingRewards = (finishAt - block.timestamp).mul(rewardRate.mul(digits).div(emissionPrecision));
        duration = calculateDuration(_id, rewardToken, rewards.add(remainingRewards));
      }

      if (isEmissionsStarted(_id)) {
        poolUserRewards[_id][rewardToken].finishAt = block.timestamp + duration;
        poolUserRewards[_id][rewardToken].lastUpdateTime = block.timestamp;
      } else {
        poolUserRewards[_id][rewardToken].finishAt = poolUserRewards[_id][rewardToken].lastUpdateTime + duration;
      }
    }
  }

  function resetSupplyRewards(uint256 _id, SupplyReward[] memory rewardsArray) public validatePoolExists(_id) onlyOperator() {
    require(!isEmissionsStarted(_id), "EmSt");
    uint256 arrayLength = rewardsArray.length;
    for (uint8 i; i < arrayLength; ++i) {
      IERC20 rewardToken = rewardsArray[i].rewardToken;
      poolUserRewards[_id][rewardToken].finishAt = 0;
    }
  }

  function stake(uint256 _id, uint256 _amount) external nonReentrant() validateStaking(_id, _amount) updateUserReward(msg.sender, _id) {

    _claim(_id);

    poolUserStakes[_id].totalStakedAllUsers = poolUserStakes[_id].totalStakedAllUsers.add(_amount);

    if (poolUserStakes[_id].userIds[msg.sender] == 0) {
      poolUserStakes[_id].idCounter = poolUserStakes[_id].idCounter.add(1);
      poolUserStakes[_id].userIds[msg.sender] = poolUserStakes[_id].idCounter;
      poolUserStakes[_id].users.push(msg.sender);
      if (pools[_id].fppFirstTime > 0) {
        frequentPoints.addPoints(msg.sender, pools[_id].fppFirstTime);
      }
    }
    poolUserStakes[_id].userStakes[msg.sender].stakes = poolUserStakes[_id].userStakes[msg.sender].stakes.add(_amount);
    poolUserStakes[_id].userStakes[msg.sender].lockedUntil = calculateLockedUntil(_id);
    
    pools[_id].stakingAddress.safeTransferFrom(msg.sender, address(this), _amount);
    emit Staked(msg.sender, _amount, _id, block.timestamp);
  }

  function withdraw(uint256 _id, uint256 _amount) public nonReentrant() validateWithdrawal(_id, msg.sender, _amount) updateUserReward(msg.sender, _id) {

    _claim(_id);

    poolUserStakes[_id].totalStakedAllUsers = poolUserStakes[_id].totalStakedAllUsers.sub(_amount);
    poolUserStakes[_id].userStakes[msg.sender].stakes = poolUserStakes[_id].userStakes[msg.sender].stakes.sub(_amount);
    uint256 fees = _amount.mul(pools[_id].withdrawalFee).div(HPERC);
    if (fees > 0) {
      pools[_id].stakingAddress.safeTransfer(address(papparicoTreasury), fees);
    }
    pools[_id].stakingAddress.safeTransfer(msg.sender, _amount.sub(fees));
    emit Withdrawn(msg.sender, _amount.sub(fees), _id, block.timestamp);
  }

  function withdrawAll(uint256 _id) external {
    withdraw(_id, poolUserStakes[_id].userStakes[msg.sender].stakes);
  }

  function claim(uint256 _id) public validateClaim(_id) nonReentrant() {
    _claim(_id);
  }

  function _claim(uint256 _id) private updateUserRewardWhenClaim(msg.sender, _id) {
    uint256 rewardTokensLength = poolRewardingTokensAddresses[_id].length;
    for (uint8 i; i < rewardTokensLength; ++i) {
      IERC20 rewardToken = poolRewardingTokensAddresses[_id][i];

      uint256 rewards = userCurrentRewards[_id][rewardToken][msg.sender];
      if (rewards > 0) {
        userTotalClaimed[_id][rewardToken][msg.sender] = userTotalClaimed[_id][rewardToken][msg.sender].add(rewards);
        poolUserRewards[_id][rewardToken].totalClaimed = poolUserRewards[_id][rewardToken].totalClaimed.add(rewards);
        userCurrentRewards[_id][rewardToken][msg.sender] = 0;
        rewardToken.safeTransfer(msg.sender, rewards);
        emit Claimed(msg.sender, rewardToken, rewards, block.timestamp);
      }      
    }
  }

  function calculateLockedUntil(uint256 _id) public view returns (uint256) {
    uint256 lockedUntil = 0;
    if (pools[_id].lockType == LockType.MINUTES) {
      lockedUntil = DateUtils.addMinutes(block.timestamp, pools[_id].timeAmountLocked);
    } else if (pools[_id].lockType == LockType.HOURS) {
      lockedUntil = DateUtils.addHours(block.timestamp, pools[_id].timeAmountLocked);
    } else if (pools[_id].lockType == LockType.DAYS) {
      lockedUntil = DateUtils.addDays(block.timestamp, pools[_id].timeAmountLocked);
    } else if (pools[_id].lockType == LockType.MONTHS) {
      lockedUntil = DateUtils.addMonths(block.timestamp, pools[_id].timeAmountLocked);
    }

    if (lockedUntil == 0) {
      return lockedUntil;
    }
    uint256 largest = getLargest(getFinishAtSet(_id));
    return lockedUntil > largest ? largest : lockedUntil;
  }

  function getLastUpdateTime(uint256 _id, IERC20 _rewardToken) public view returns (uint256) {
    uint256 finishAt = poolUserRewards[_id][_rewardToken].finishAt;
    return block.timestamp < finishAt ? block.timestamp : finishAt;
  }

  function calculateDuration(uint256 _id, IERC20 _rewardToken, uint256 _amount) public view validatePoolExists(_id) returns (uint256) {
    uint256 digits = poolRewardingTokensEmissionParams[_id][_rewardToken].digits;
    uint256 emissionPrecision = poolRewardingTokensEmissionParams[_id][_rewardToken].emissionPrecision;
    uint256 rewardRate = calculateRewardRate(_id, _rewardToken);
    return _amount.div(rewardRate.mul(digits).div(emissionPrecision));
  }

  function isPoolExists(uint256 _id) public view returns (bool) {
    return _id > 0 && pools[_id].poolId == _id;
  }

  function isEmissionsStarted(uint256 _id) public view returns (bool) {
    return pools[_id].isInitialized && block.timestamp >= pools[_id].startTime;
  }

  function calculateRewardRate(uint256 _id, IERC20 _rewardToken) public view returns (uint256) {
    uint256 emissionPerSecond = poolRewardingTokensEmissionParams[_id][_rewardToken].rewardEmissionPerSecond;
    uint256 emission = poolRewardingTokensEmissionParams[_id][_rewardToken].emission;
    uint256 multiplier = poolRewardingTokensEmissionParams[_id][_rewardToken].multiplier;
    return emissionPerSecond.mul(multiplier).mul(emission);
  }

  function calculateRewardPerToken(uint256 _id, IERC20 _rewardToken) public view returns (uint256) {
    if (!isEmissionsStarted(_id)) {
      return 0;
    }
    if (poolUserStakes[_id].totalStakedAllUsers == 0) {
      return poolUserRewards[_id][_rewardToken].currentRewardPerToken;
    }
    uint256 precision = poolRewardingTokensEmissionParams[_id][_rewardToken].precision;
    uint256 emissionPrecision = poolRewardingTokensEmissionParams[_id][_rewardToken].emissionPrecision;

    return poolUserRewards[_id][_rewardToken].currentRewardPerToken
      .add(
        (getLastUpdateTime(_id, _rewardToken) - poolUserRewards[_id][_rewardToken].lastUpdateTime)
          .mul(calculateRewardRate(_id, _rewardToken))
          .mul(precision)
          .div(emissionPrecision)
          .div(poolUserStakes[_id].totalStakedAllUsers)
      );
  }

  function getPoolData(uint256 _id) external view returns (Pool memory) {
    return pools[_id];
  }

  function getPoolRewardingEmissionParams(uint256 _id) external view returns (RewardingTokenEmissionParams[] memory) {
    uint256 rewardingAddressesLength = poolRewardingTokensAddresses[_id].length;
    RewardingTokenEmissionParams[] memory emissionParams = new RewardingTokenEmissionParams[](rewardingAddressesLength);

    for (uint8 i; i < rewardingAddressesLength; ++i) {
      IERC20 rewardToken = poolRewardingTokensAddresses[_id][i];

      RewardingTokenEmissionParams memory emissionParam = RewardingTokenEmissionParams({
        rewardToken: rewardToken,
        digits: poolRewardingTokensEmissionParams[_id][rewardToken].digits,
        precision: poolRewardingTokensEmissionParams[_id][rewardToken].precision,
        emission: poolRewardingTokensEmissionParams[_id][rewardToken].emission,
        emissionPrecision: poolRewardingTokensEmissionParams[_id][rewardToken].emissionPrecision,
        multiplier: poolRewardingTokensEmissionParams[_id][rewardToken].multiplier,
        rewardEmissionPerSecond: poolRewardingTokensEmissionParams[_id][rewardToken].rewardEmissionPerSecond
      });
      emissionParams[i] = emissionParam;
    }

    return emissionParams;
  }

  function getUserStakingData(uint256 _id, address _user) external view returns (UserStakingData memory) {
    UserStakingData memory userStakingData;
    userStakingData = UserStakingData({
      lockedUntil: poolUserStakes[_id].userStakes[_user].lockedUntil,
      stakes: poolUserStakes[_id].userStakes[_user].stakes
    });
    return userStakingData;
  }

  function getTotalStakedAllUsers(uint256 _id) external view returns (uint256) {
    return poolUserStakes[_id].totalStakedAllUsers;
  }

  function rewardsOf(address _user, uint256 _id, IERC20 _rewardToken) private view returns (uint256) {
    uint256 userRewards = 0;
    if (!isEmissionsStarted(_id)) {
      return userRewards;
    }

    uint256 userStakes = poolUserStakes[_id].userStakes[_user].stakes;
    uint256 rewardsPerTokenPaid = userRewardsPerTokenPaid[_id][_rewardToken][_user];
    uint256 digits = poolRewardingTokensEmissionParams[_id][_rewardToken].digits;
    uint256 precision = poolRewardingTokensEmissionParams[_id][_rewardToken].precision;
    uint256 rewardPerTokenCalculated = calculateRewardPerToken(_id, _rewardToken);
    userRewards = userRewards.add
    (
      userStakes
        .mul(rewardPerTokenCalculated.sub(rewardsPerTokenPaid))
        .mul(digits).div(precision)
    );
    return userRewards.add(userCurrentRewards[_id][_rewardToken][_user]);
  }

  function rewardsOf(uint256 _id, address _user) public view returns (UserRewardOutput[] memory) {
    uint256 rewardingAddressesLength = poolRewardingTokensAddresses[_id].length;
    UserRewardOutput[] memory rewardsOutput = new UserRewardOutput[](rewardingAddressesLength);

    for (uint8 i; i < rewardingAddressesLength; ++i) {
      IERC20 rewardToken = poolRewardingTokensAddresses[_id][i];
      uint256 decimal = poolRewardingTokensDecimals[_id][i];

      UserRewardOutput memory output = UserRewardOutput({
        rewardToken: rewardToken,
        lastUpdateTime: poolUserRewards[_id][rewardToken].lastUpdateTime,
        finishAt: poolUserRewards[_id][rewardToken].finishAt,
        isFinished: block.timestamp > poolUserRewards[_id][rewardToken].finishAt,
        decimal: decimal,
        rewards: rewardsOf(_user, _id, rewardToken),
        totalClaimed: userTotalClaimed[_id][rewardToken][_user]
      });
      rewardsOutput[i] = output;
    }

    return rewardsOutput;
  }

  function setStartTime(uint256 _id, uint256 _startTime) external onlyOperator() {
    require(!isEmissionsStarted(_id), "EmSt");
    require(_startTime >= block.timestamp, "InvTime");
    pools[_id].startTime = _startTime;
    uint256 rewardTokensLength = poolRewardingTokensAddresses[_id].length;
    uint256 lastTime = _startTime;

    for (uint8 i; i < rewardTokensLength; ++i) {
      IERC20 rewardToken = poolRewardingTokensAddresses[_id][i];
      poolUserRewards[_id][rewardToken].lastUpdateTime = lastTime;
      
      poolUserRewards[_id][rewardToken].finishAt = 0;
    }
  }

  function setRewardEmissionPerSecond(uint256 _id, IERC20 _rewardToken, uint256 _amount) external onlyOperator() {
    if (isEmissionsStarted(_id)) {
      updateAll(_id);
    }
    poolRewardingTokensEmissionParams[_id][_rewardToken].rewardEmissionPerSecond = _amount;
  }

  function updateAll(uint256 _id) private onlyOperator() {
    for (uint256 i; i < poolUserStakes[_id].users.length; ++i) {
      address user = poolUserStakes[_id].users[i];
      if (poolUserStakes[_id].userStakes[user].stakes > 0) {
        doUpdateUserReward(user, _id);
      }
    }
  }

  receive() external payable override {
    PayableUtils.sendNative(address(papparicoTreasury));
  }

  function sendToken(IERC20 _token) external override onlyAdmin() {
    PayableUtils.sendToken(_token, address(papparicoTreasury));
  }

  function doUpdateUserReward(address _user, uint256 _id) private {
    if (isEmissionsStarted(_id)) {
      uint256 rewardTokensLength = poolRewardingTokensAddresses[_id].length;

      for (uint8 i; i < rewardTokensLength; ++i) {
        IERC20 rewardToken = poolRewardingTokensAddresses[_id][i];
        poolUserRewards[_id][rewardToken].currentRewardPerToken = calculateRewardPerToken(_id, rewardToken);
        poolUserRewards[_id][rewardToken].lastUpdateTime = getLastUpdateTime(_id, rewardToken);
        userCurrentRewards[_id][rewardToken][_user] = rewardsOf(_user, _id, rewardToken);
        userRewardsPerTokenPaid[_id][rewardToken][_user] = poolUserRewards[_id][rewardToken].currentRewardPerToken;
      }
    }
  }

  function getFinishAtSet(uint256 _id) private view returns(uint256[] memory) {
    uint256 length = poolRewardingTokensAddresses[_id].length;
    uint256[] memory numbers = new uint256[](length);
    for (uint8 i; i < length; ++i) {
      IERC20 rewardToken = poolRewardingTokensAddresses[_id][i];
      numbers[i] = poolUserRewards[_id][rewardToken].finishAt;
    }
    return numbers;
  }

  function getLargest(uint256[] memory numbers) private pure returns(uint256) {
    uint256 store_var = 0;
    uint256 i;
    for (i; i < numbers.length; i++){
      if (store_var < numbers[i]) {
        store_var = numbers[i];
      }
    }
    return store_var;
   }

  modifier updateUserRewardWhenClaim(address _user, uint256 _id) {
    if (isEmissionsStarted(_id)) {
      doUpdateUserReward(_user, _id);
    }
    _;
  }

  modifier updateUserReward(address _user, uint256 _id) {
    doUpdateUserReward(_user, _id);
    _;
  }

  modifier validatePoolExists(uint256 _id) {
    require(isPoolExists(_id), "PNexists");
    _;
  }

  modifier validatePoolCreation(uint256 _id, Pool memory _pool, IERC20[] memory rewardingTokenAddresses, RewardingTokenEmissionParams[] memory rewardingParams) {
    require(!isPoolExists(_id), "Pexists");
    require(!_pool.isInitialized, "CrtdInilzd");
    require(rewardingTokenAddresses.length > 0, "NRewardingProvided");
    require(rewardingParams.length > 0 && rewardingParams.length == rewardingTokenAddresses.length, "RewardingParamsInvalid");
    _;
  }

  modifier validateInitialize(uint256 _id, uint256 _startBlock) {
    require(isPoolExists(_id), "PNexists");
    require(!pools[_id].isInitialized, "Inilzd");
    require(_startBlock >= block.number, "InvB");
    _;
  }

  modifier validateStaking(uint256 _id, uint256 _amount) {
    require(isPoolExists(_id), "PNexists");
    require(pools[_id].isInitialized, "NInilzd");
    require(_amount > 0, "Gt0");
    require(pools[_id].stakingAddress.balanceOf(msg.sender) >= _amount, "Nfun");
    _;
  }

  modifier validateWithdrawal(uint256 _id, address _user, uint256 _amount) {
    require(isPoolExists(_id), "PNexists");
    require(_amount > 0, "Gt0");
    require(poolUserStakes[_id].userStakes[msg.sender].lockedUntil <= block.timestamp, "Ntime");
    require(poolUserStakes[_id].userStakes[msg.sender].stakes >= _amount, "Invalid amount");
    _;
  }

  modifier validateClaim(uint256 _id) {
    require(isPoolExists(_id), "PNexists");
    _;
  }

  modifier onlyOperator() {
    require(hasRole(OPERATOR, msg.sender), "NOptr");
    _;
  }

  modifier onlyAdmin() {
    require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "NAdm");
    _;
  }

  event Staked(address indexed _user, uint256 _amount, uint256 _id, uint256 _timestamp);
  event Withdrawn(address indexed _user, uint256 _amount, uint256 _id, uint256 _timestamp);
  event Claimed(address indexed _user, IERC20 _rewardToken, uint256 _amount, uint256 _timestamp);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (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;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    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");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation 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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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/v0.8.0/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 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;
    }
}

// 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 (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

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

interface IPapparicoPayable {

  receive() external payable;

  function sendToken(IERC20 _token) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

library DateUtils {

  uint256 constant SECONDS_PER_DAY = 24 * 60 * 60;
  uint256 constant SECONDS_PER_HOUR = 60 * 60;
  uint256 constant SECONDS_PER_MINUTE = 60;
  int constant OFFSET19700101 = 2440588;

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

  function _daysFromDate(uint year, uint month, uint day) internal pure returns (uint _days) {
    require(year >= 1970);
    int _year = int(year);
    int _month = int(month);
    int _day = int(day);

    int __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 = uint(__days);
  }

  function _daysToDate(uint _days) internal pure returns (uint year, uint month, uint day) {
    int __days = int(_days);

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

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

  function timestampFromDate(uint year, uint month, uint day) internal pure returns (uint timestamp) {
      timestamp = _daysFromDate(year, month, day) * SECONDS_PER_DAY;
  }
  function timestampFromDateTime(uint year, uint month, uint day, uint hour, uint minute, uint second) internal pure returns (uint timestamp) {
      timestamp = _daysFromDate(year, month, day) * SECONDS_PER_DAY + hour * SECONDS_PER_HOUR + minute * SECONDS_PER_MINUTE + second;
  }
  function timestampToDate(uint timestamp) internal pure returns (uint year, uint month, uint day) {
      (year, month, day) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }
  function timestampToDateTime(uint timestamp) internal pure returns (uint year, uint month, uint day, uint hour, uint minute, uint second) {
      (year, month, day) = _daysToDate(timestamp / SECONDS_PER_DAY);
      uint 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(uint year, uint month, uint day) internal pure returns (bool valid) {
      if (year >= 1970 && month > 0 && month <= 12) {
          uint daysInMonth = _getDaysInMonth(year, month);
          if (day > 0 && day <= daysInMonth) {
              valid = true;
          }
      }
  }
  function isValidDateTime(uint year, uint month, uint day, uint hour, uint minute, uint second) internal pure returns (bool valid) {
      if (isValidDate(year, month, day)) {
          if (hour < 24 && minute < 60 && second < 60) {
              valid = true;
          }
      }
  }
  function isLeapYear(uint timestamp) internal pure returns (bool leapYear) {
      (uint year,,) = _daysToDate(timestamp / SECONDS_PER_DAY);
      leapYear = _isLeapYear(year);
  }
  function _isLeapYear(uint year) internal pure returns (bool leapYear) {
      leapYear = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
  }
  function isWeekDay(uint timestamp) internal pure returns (bool weekDay) {
      weekDay = getDayOfWeek(timestamp) <= DOW_FRI;
  }
  function isWeekEnd(uint timestamp) internal pure returns (bool weekEnd) {
      weekEnd = getDayOfWeek(timestamp) >= DOW_SAT;
  }
  function getDaysInMonth(uint timestamp) internal pure returns (uint daysInMonth) {
      (uint year, uint month,) = _daysToDate(timestamp / SECONDS_PER_DAY);
      daysInMonth = _getDaysInMonth(year, month);
  }
  function _getDaysInMonth(uint year, uint month) internal pure returns (uint 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(uint timestamp) internal pure returns (uint dayOfWeek) {
      uint _days = timestamp / SECONDS_PER_DAY;
      dayOfWeek = (_days + 3) % 7 + 1;
  }

  function getYear(uint timestamp) internal pure returns (uint year) {
      (year,,) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }
  function getMonth(uint timestamp) internal pure returns (uint month) {
      (,month,) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }
  function getDay(uint timestamp) internal pure returns (uint day) {
      (,,day) = _daysToDate(timestamp / SECONDS_PER_DAY);
  }
  function getHour(uint timestamp) internal pure returns (uint hour) {
      uint secs = timestamp % SECONDS_PER_DAY;
      hour = secs / SECONDS_PER_HOUR;
  }
  function getMinute(uint timestamp) internal pure returns (uint minute) {
      uint secs = timestamp % SECONDS_PER_HOUR;
      minute = secs / SECONDS_PER_MINUTE;
  }
  function getSecond(uint timestamp) internal pure returns (uint second) {
      second = timestamp % SECONDS_PER_MINUTE;
  }

  function addYears(uint timestamp, uint _years) internal pure returns (uint newTimestamp) {
      (uint year, uint month, uint day) = _daysToDate(timestamp / SECONDS_PER_DAY);
      year += _years;
      uint 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(uint timestamp, uint _months) internal pure returns (uint newTimestamp) {
      (uint year, uint month, uint day) = _daysToDate(timestamp / SECONDS_PER_DAY);
      month += _months;
      year += (month - 1) / 12;
      month = (month - 1) % 12 + 1;
      uint 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(uint timestamp, uint _days) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp + _days * SECONDS_PER_DAY;
      require(newTimestamp >= timestamp);
  }
  function addHours(uint timestamp, uint _hours) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp + _hours * SECONDS_PER_HOUR;
      require(newTimestamp >= timestamp);
  }
  function addMinutes(uint timestamp, uint _minutes) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp + _minutes * SECONDS_PER_MINUTE;
      require(newTimestamp >= timestamp);
  }
  function addSeconds(uint timestamp, uint _seconds) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp + _seconds;
      require(newTimestamp >= timestamp);
  }

  function subYears(uint timestamp, uint _years) internal pure returns (uint newTimestamp) {
      (uint year, uint month, uint day) = _daysToDate(timestamp / SECONDS_PER_DAY);
      year -= _years;
      uint 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(uint timestamp, uint _months) internal pure returns (uint newTimestamp) {
      (uint year, uint month, uint day) = _daysToDate(timestamp / SECONDS_PER_DAY);
      uint yearMonth = year * 12 + (month - 1) - _months;
      year = yearMonth / 12;
      month = yearMonth % 12 + 1;
      uint 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(uint timestamp, uint _days) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp - _days * SECONDS_PER_DAY;
      require(newTimestamp <= timestamp);
  }
  function subHours(uint timestamp, uint _hours) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp - _hours * SECONDS_PER_HOUR;
      require(newTimestamp <= timestamp);
  }
  function subMinutes(uint timestamp, uint _minutes) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp - _minutes * SECONDS_PER_MINUTE;
      require(newTimestamp <= timestamp);
  }
  function subSeconds(uint timestamp, uint _seconds) internal pure returns (uint newTimestamp) {
      newTimestamp = timestamp - _seconds;
      require(newTimestamp <= timestamp);
  }

  function diffYears(uint fromTimestamp, uint toTimestamp) internal pure returns (uint _years) {
      require(fromTimestamp <= toTimestamp);
      (uint fromYear,,) = _daysToDate(fromTimestamp / SECONDS_PER_DAY);
      (uint toYear,,) = _daysToDate(toTimestamp / SECONDS_PER_DAY);
      _years = toYear - fromYear;
  }
  function diffMonths(uint fromTimestamp, uint toTimestamp) internal pure returns (uint _months) {
      require(fromTimestamp <= toTimestamp);
      (uint fromYear, uint fromMonth,) = _daysToDate(fromTimestamp / SECONDS_PER_DAY);
      (uint toYear, uint toMonth,) = _daysToDate(toTimestamp / SECONDS_PER_DAY);
      _months = toYear * 12 + toMonth - fromYear * 12 - fromMonth;
  }
  function diffDays(uint fromTimestamp, uint toTimestamp) internal pure returns (uint _days) {
      require(fromTimestamp <= toTimestamp);
      _days = (toTimestamp - fromTimestamp) / SECONDS_PER_DAY;
  }
  function diffHours(uint fromTimestamp, uint toTimestamp) internal pure returns (uint _hours) {
      require(fromTimestamp <= toTimestamp);
      _hours = (toTimestamp - fromTimestamp) / SECONDS_PER_HOUR;
  }
  function diffMinutes(uint fromTimestamp, uint toTimestamp) internal pure returns (uint _minutes) {
      require(fromTimestamp <= toTimestamp);
      _minutes = (toTimestamp - fromTimestamp) / SECONDS_PER_MINUTE;
  }
  function diffSeconds(uint fromTimestamp, uint toTimestamp) internal pure returns (uint _seconds) {
      require(fromTimestamp <= toTimestamp);
      _seconds = toTimestamp - fromTimestamp;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

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

library PayableUtils {

  using SafeERC20 for IERC20;

  function sendNative(address _to) internal {
    uint256 amount = address(this).balance;
    payable(_to).transfer(amount);
    emit NativeSent(_to, amount);
  }

  function sendToken(IERC20 _token, address _to) internal {
    uint256 tokenBalance = _token.balanceOf(address(this));
    require(tokenBalance > 0, "Can't send 0.");
    _token.safeTransfer(_to, tokenBalance);
    emit TokenSent(address(_token), _to, tokenBalance);
  }

  event NativeSent(address indexed _to, uint256 _amount);
  event TokenSent(address indexed _token, address indexed _to, uint256 _amount);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./PapparicoTreasury.sol";
import "./IPapparicoPayable.sol";
import "./lib/PayableUtils.sol";

contract PapparicoFrequentPlayerPoints is AccessControl, ReentrancyGuard, IPapparicoPayable {

  using SafeMath for uint256;

  bytes32 constant SOURCE_BENEFIT = keccak256("SOURCE_BENEFIT");
  bytes32 constant TARGET_BENEFIT = keccak256("TARGET_BENEFIT");

  mapping(address => uint256) public userAccruedPoints;
  mapping(address => uint256) public userPointsUsed;
  uint256 public totalPointsUsed;

  PapparicoTreasury private immutable treasury;

  constructor(PapparicoTreasury _treasury) {

    _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    _grantRole(SOURCE_BENEFIT, msg.sender);
    _grantRole(TARGET_BENEFIT, msg.sender);

    treasury = _treasury;
  }

  function addPoints(address _user, uint256 _amount) external nonReentrant onlySourceBenefit() {
    userAccruedPoints[_user] = userAccruedPoints[_user].add(_amount);
    emit PointsAdded(_user, _amount);
  }

  function usePoints(address _user, uint256 _amount) external nonReentrant onlyTargetBenefit() {
    require(_amount > 0, "Can't use 0");
    require(userAccruedPoints[_user] >= _amount, "Insufficient points");
    userPointsUsed[_user] = userPointsUsed[_user].add(_amount);
    totalPointsUsed = totalPointsUsed.add(_amount);
    userAccruedPoints[_user] = userAccruedPoints[_user].sub(_amount);
    emit PointsUsed(_user, _amount);
  }

  function unusePoints(address _user, uint256 _amount) external nonReentrant onlyTargetBenefit() {
    userPointsUsed[_user] = userPointsUsed[_user].sub(_amount);
    totalPointsUsed = totalPointsUsed.sub(_amount);
    userAccruedPoints[_user] = userAccruedPoints[_user].add(_amount);
    emit PointsUnused(_user, _amount);
  }

  function getUserPointsUsed(address _user) external view returns (uint256) {
    return userPointsUsed[_user];
  }

  receive() external payable override { }

  function sendToken(IERC20 _token) external override onlyAdmin() {
    PayableUtils.sendToken(_token, address(treasury));
  }

  modifier onlySourceBenefit() {
    require(hasRole(SOURCE_BENEFIT, msg.sender), "NSourBen");
    _;
  }

  modifier onlyTargetBenefit() {
    require(hasRole(TARGET_BENEFIT, msg.sender), "NTargBen");
    _;
  }

  modifier onlyAdmin() {
    require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "NAdm");
    _;
  }

  event PointsAdded(address indexed _user, uint256 indexed _value);
  event PointsUsed(address indexed _user, uint256 indexed _value);
  event PointsUnused(address indexed _user, uint256 indexed _value);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

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

contract PapparicoTreasury is AccessControl {

  using SafeERC20 for IERC20;

  bytes32 public constant TOKEN_SENDER = keccak256("SENDER");

  constructor() {
    _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    _grantRole(TOKEN_SENDER, msg.sender);
  }

  receive() external payable { }

  function sendNative(address _to, uint256 _amount) public onlyTokenSender() {
    require(_amount > 0, "Can't send 0.");
    require(address(this).balance >= _amount, "Not enough balance.");
    payable(_to).transfer(_amount);
    emit NativeSent(_to, _amount);
  }

  function sendToken(IERC20 _token, address _to, uint256 _amount) public onlyTokenSender() {
    require(_amount > 0, "Can't send 0.");
    require(_token.balanceOf(address(this)) >= _amount, "Not enough balance.");
    _token.safeTransfer(_to, _amount);
    emit TokenSent(address(_token), _to, _amount);
  }

  modifier onlyAdmin() {
    require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "Caller does not have the Admin role.");
    _;
  }

  modifier onlyTokenSender() {
    require(hasRole(TOKEN_SENDER, msg.sender), "Caller does not have the Token Sender role.");
    _;
  }

  event NativeSent(address indexed _to, uint256 _amount);
  event TokenSent(address indexed _token, address indexed _to, uint256 _amount);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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PapparicoSingleStaking.SupplyReward[]","name":"rewardsArray","type":"tuple[]"}],"name":"supplyRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"contract IERC20","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"userCurrentRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"contract IERC20","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"userRewardsPerTokenPaid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"contract IERC20","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"userTotalClaimed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"}],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000d43b847905cb93aaae46c5cde9d9facbb09661090000000000000000000000001e5bedf6888981773e4b860d1e8c5b87f17282aa

-----Decoded View---------------
Arg [0] : _papparicoTreasury (address): 0xD43B847905Cb93aAae46C5cdE9d9facbb0966109
Arg [1] : _frequentPoints (address): 0x1E5BEdf6888981773E4B860d1e8c5B87F17282AA

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000d43b847905cb93aaae46c5cde9d9facbb0966109
Arg [1] : 0000000000000000000000001e5bedf6888981773e4b860d1e8c5b87f17282aa