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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/utils/Context.sol';
import './interfaces/IPoolExtension.sol';

contract StakingPool is Context, Ownable, ReentrancyGuard {
  using SafeERC20 for IERC20;

  uint256 constant MULTIPLIER = 10 ** 36;
  address public token;
  uint256 public lockupPeriod;
  uint256 public penalty = 1; // 1 = 1%
  uint256 public totalStakedUsers;
  uint256 public totalSharesDeposited;

  IPoolExtension public extension;
  IPoolExtension public extensionERC20;

  struct Share {
    uint256 amount;
    uint256 stakedTime;
  }
  struct Reward {
    uint256 excluded;
    uint256 realised;
  }
  mapping(address => Share) public shares;
  mapping(address => Reward) public rewards;

  uint256 public rewardsPerShare;
  uint256 public totalDistributed;
  uint256 public totalRewards;

  event Stake(address indexed user, uint256 amount);
  event Unstake(address indexed user, uint256 amount);
  event ClaimReward(address user);
  event DepositRewards(address indexed user, uint256 amountTokens);
  event DistributeReward(
    address indexed user,
    uint256 amount,
    bool _wasCompounded
  );

  constructor(address _token, uint256 _lockupPeriod, address _initialOwner) Ownable(_initialOwner) {
    token = _token;
    lockupPeriod = _lockupPeriod;
  }

  function stake(uint256 _amount) external nonReentrant {
    IERC20(token).safeTransferFrom(_msgSender(), address(this), _amount);
    _setShare(_msgSender(), _amount, false);
  }

  function reStake() external nonReentrant {
    if (address(extension) != address(0)) {
        uint256 rewardAmount = extension.calculateRewards(_msgSender());
        extension.reStake(_msgSender(), rewardAmount);
        _setShare(_msgSender(), rewardAmount, false);
    }
  }

  function stakeForWallets(
    address[] memory _wallets,
    uint256[] memory _amounts
  ) external nonReentrant {
    require(_wallets.length == _amounts.length, 'INSYNC');
    uint256 _totalAmount;
    for (uint256 _i; _i < _wallets.length; _i++) {
      _totalAmount += _amounts[_i];
      _setShare(_wallets[_i], _amounts[_i], false);
    }
    IERC20(token).safeTransferFrom(_msgSender(), address(this), _totalAmount);
  }

  function unstake(uint256 _amount) external nonReentrant {
    if (block.timestamp - shares[_msgSender()].stakedTime < lockupPeriod) {
        IERC20(token).safeTransfer(_msgSender(), (_amount * (100 - penalty)) / 100);
    } else {
        IERC20(token).safeTransfer(_msgSender(), _amount);
    }
    _setShare(_msgSender(), _amount, true);
  }

  function _setShare(
    address wallet,
    uint256 balanceUpdate,
    bool isRemoving
  ) internal {
    if (address(extension) != address(0)) {
      try extension.setShare(wallet, balanceUpdate, isRemoving) {} catch {}
    }
    if (address(extensionERC20) != address(0)) {
      try extensionERC20.setShare(wallet, balanceUpdate, isRemoving) {} catch {}
    }
    if (isRemoving) {
      _removeShares(wallet, balanceUpdate);
      emit Unstake(wallet, balanceUpdate);
    } else {
      _addShares(wallet, balanceUpdate);
      emit Stake(wallet, balanceUpdate);
    }
  }

  function _addShares(address wallet, uint256 amount) private {
    if (shares[wallet].amount > 0) {
      _distributeReward(wallet, false, 0);
    }
    uint256 sharesBefore = shares[wallet].amount;
    totalSharesDeposited += amount;
    shares[wallet].amount += amount;
    shares[wallet].stakedTime = block.timestamp;
    if (sharesBefore == 0 && shares[wallet].amount > 0) {
      totalStakedUsers++;
    }
    rewards[wallet].excluded = _cumulativeRewards(shares[wallet].amount);
  }

  function _removeShares(address wallet, uint256 amount) private {
    require(
      shares[wallet].amount > 0 && amount <= shares[wallet].amount,
      'REM: amount'
    );
    uint256 _unclaimed = getUnpaid(wallet);
    bool _otherStakersPresent = totalSharesDeposited - amount > 0;
    if (!_otherStakersPresent) {
      _distributeReward(wallet, false, 0);
    }
    totalSharesDeposited -= amount;
    shares[wallet].amount -= amount;
    if (shares[wallet].amount == 0) {
      totalStakedUsers--;
    }
    rewards[wallet].excluded = _cumulativeRewards(shares[wallet].amount);
    // if there are other stakers and unclaimed rewards,
    // deposit them back into the pool for other stakers to claim
    if (_otherStakersPresent && _unclaimed > 0) {
      _depositRewards(wallet, _unclaimed);
    }
  }

  function depositRewards() external payable {
    _depositRewards(_msgSender(), msg.value);
  }

  function _depositRewards(address _wallet, uint256 _amountETH) internal {
    require(_amountETH > 0, 'ETH');
    require(totalSharesDeposited > 0, 'SHARES');
    totalRewards += _amountETH;
    rewardsPerShare += (MULTIPLIER * _amountETH) / totalSharesDeposited;
    emit DepositRewards(_wallet, _amountETH);
  }

  function _distributeReward(
    address _wallet,
    bool _compound,
    uint256 _compoundMinTokensToReceive
  ) internal {
    if (shares[_wallet].amount == 0) {
      return;
    }
    shares[_wallet].stakedTime = block.timestamp; // reset every claim
    uint256 _amountWei = getUnpaid(_wallet);
    rewards[_wallet].realised += _amountWei;
    rewards[_wallet].excluded = _cumulativeRewards(shares[_wallet].amount);
    if (_amountWei > 0) {
      totalDistributed += _amountWei;
      uint256 _balBefore = address(this).balance;
      (bool success, ) = payable(_wallet).call{ value: _amountWei }('');
      require(success, 'DIST0');
      require(address(this).balance >= _balBefore - _amountWei, 'DIST1');
      emit DistributeReward(_wallet, _amountWei, _compound);
    }
  }

  function claimReward(
    bool _compound,
    uint256 _compMinTokensToReceive
  ) external nonReentrant {
    _distributeReward(_msgSender(), _compound, _compMinTokensToReceive);
    emit ClaimReward(_msgSender());
  }

  function claimRewardAdmin(
    address _wallet,
    bool _compound,
    uint256 _compMinTokensToReceive
  ) external nonReentrant onlyOwner {
    _distributeReward(_wallet, _compound, _compMinTokensToReceive);
    emit ClaimReward(_wallet);
  }

  function getUnpaid(address wallet) public view returns (uint256) {
    if (shares[wallet].amount == 0) {
      return 0;
    }
    uint256 earnedRewards = _cumulativeRewards(shares[wallet].amount);
    uint256 rewardsExcluded = rewards[wallet].excluded;
    if (earnedRewards <= rewardsExcluded) {
      return 0;
    }
    return earnedRewards - rewardsExcluded;
  }

  function _cumulativeRewards(uint256 share) internal view returns (uint256) {
    return (share * rewardsPerShare) / MULTIPLIER;
  }

  function setPoolExtension(IPoolExtension _extension) external onlyOwner {
    extension = _extension;
  }

  function setPoolExtensionERC20(IPoolExtension _extension) external onlyOwner {
    extensionERC20 = _extension;
  }

  function setLockupPeriod(uint256 _seconds) external onlyOwner {
    require(_seconds < 365 days, 'lte 1 year');
    lockupPeriod = _seconds;
  }

  // 1 = 1% 
  function setPenalty(uint256 _percent) external onlyOwner {
    require(_percent < 100, 'lte 100 percent');
    penalty = _percent;
  }

  function withdrawETH(uint256 amount) external onlyOwner {
    require(amount <= address(this).balance, "Insufficient balance");
    address payable to = payable(_msgSender());
    to.transfer(amount);
  }

  function withdrawAnyERC20(uint256 amount, address contractAddress) external onlyOwner {
    IERC20 _token = IERC20(contractAddress);
    require(amount <= _token.balanceOf(address(this)), "Insufficient balance");
    _token.safeTransfer(
      _msgSender(),
      amount
    );
  }

  function withdrawTokens(uint256 _amount) external onlyOwner {
    IERC20 _token = IERC20(token);
    _token.safeTransfer(
      _msgSender(),
      _amount == 0 ? _token.balanceOf(address(this)) : _amount
    );
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import './interfaces/IPoolExtension.sol';
import './StakingPool.sol';

contract PoolManager is Ownable {
  using SafeERC20 for IERC20;
  
  uint256 constant FACTOR = 10000;
  
  address public stakingToken;
  uint256 _totalPercentages;
  bool public adminCanWithdraw = true;

  struct PoolInfo {
    address pool;
    uint256 percentage;
  }

  PoolInfo[] public pools;

  // Token to be staked
  constructor(address _stakingToken) Ownable(_msgSender()) {
    stakingToken = _stakingToken;
    _totalPercentages = FACTOR;
    pools.push(
      PoolInfo({
        pool: address(new StakingPool(_stakingToken, 14 days, _msgSender())),
        percentage: (FACTOR * 10) / 100 // 10%
      })
    );
    pools.push(
      PoolInfo({
        pool: address(new StakingPool(_stakingToken, 28 days, _msgSender())),
        percentage: (FACTOR * 30) / 100 // 30%
      })
    );
    pools.push(
      PoolInfo({
        pool: address(new StakingPool(_stakingToken, 56 days, _msgSender())),
        percentage: (FACTOR * 60) / 100 // 60%
      })
    );
  }

  function getAllPools() external view returns (PoolInfo[] memory) {
    return pools;
  }

  function depositRewards() external payable {
    require(msg.value > 0, 'no rewards');
    uint256 _totalETH;
    for (uint256 _i; _i < pools.length; _i++) {
      uint256 _totalBefore = _totalETH;
      _totalETH += (msg.value * pools[_i].percentage) / FACTOR;
      StakingPool(pools[_i].pool).depositRewards{
        value: _totalETH - _totalBefore
      }();
    }
    uint256 _refund = msg.value - _totalETH;
    if (_refund > 0) {
      (bool _refunded, ) = payable(_msgSender()).call{ value: _refund }('');
      require(_refunded, 'could not refund');
    }
  }

  function setPercentages(uint256[] memory _percentages) external onlyOwner {
    _totalPercentages = 0;
    for (uint256 _i; _i < _percentages.length; _i++) {
      _totalPercentages += _percentages[_i];
      pools[_i].percentage = _percentages[_i];
    }
    require(_totalPercentages <= FACTOR, 'lte 100%');
  }

  function removeWithdrawAbility() external onlyOwner {
    require(adminCanWithdraw, 'already disabled');
    adminCanWithdraw = false;
  }

  function withdrawETH(uint256 amount) external onlyOwner {
    require(amount <= address(this).balance, "Insufficient balance");
    address payable to = payable(_msgSender());
    to.transfer(amount);
  }

  function withdrawAnyERC20(uint256 amount, address contractAddress) external onlyOwner {
    IERC20 _token = IERC20(contractAddress);
    require(amount <= _token.balanceOf(address(this)), "Insufficient balance");
    _token.safeTransfer(
      _msgSender(),
      amount
    );
  }

  function createPool(
    uint256 _lockupSeconds,
    uint256 _percentage
  ) external onlyOwner {
    require(_totalPercentages + _percentage <= FACTOR, 'max percentage');
    _totalPercentages += _percentage;
    pools.push(
      PoolInfo({
        pool: address(new StakingPool(stakingToken, _lockupSeconds, owner())),
        percentage: _percentage
      })
    );
  }

  function removePool(uint256 _idx) external onlyOwner {
    PoolInfo memory _pool = pools[_idx];
    _totalPercentages -= _pool.percentage;
    pools[_idx] = pools[pools.length - 1];
    pools.pop();
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface IPoolExtension {
  function setShare(
    address wallet,
    uint256 balanceChange,
    bool isRemoving
  ) external;

  function reStake(
    address wallet,
    uint256 amount
  ) external;

  function calculateRewards(address stakeHolder) external view returns (uint);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../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 An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, 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);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.encodeCall(token.approve, (spender, value));

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

    /**
     * @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);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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(token).code.length > 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

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

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// 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 v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

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

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

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) 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 FailedInnerCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @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.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
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].
     *
     * CAUTION: See Security Considerations above.
     */
    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);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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IPoolExtension","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"extensionERC20","outputs":[{"internalType":"contract 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