creation_sourcecode: pragma solidity 0.8.18;
  
  /**
   * @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;
      }
  }
  
  // File: @openzeppelin/contracts/utils/Context.sol
  
  /**
   * @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;
      }
  }
  
  // File: @openzeppelin/contracts/access/Ownable.sol
  
  /**
   * @dev Contract module which provides a basic access control mechanism, where
   * there is an account (an owner) that can be granted exclusive access to
   * specific functions.
   *
   * By default, the owner account will be the one that deploys the contract. This
   * can later be changed with {transferOwnership}.
   *
   * This module is used through inheritance. It will make available the modifier
   * `onlyOwner`, which can be applied to your functions to restrict their use to
   * the owner.
   */
  abstract contract Ownable is Context {
      address private _owner;
  
      event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
  
      /**
       * @dev Initializes the contract setting the deployer as the initial owner.
       */
      constructor() {
          _transferOwnership(_msgSender());
      }
  
      /**
       * @dev 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 {
          require(owner() == _msgSender(), "Ownable: caller is not the owner");
      }
  
      /**
       * @dev Leaves the contract without owner. It will not be possible to call
       * `onlyOwner` functions anymore. Can only be called by the current owner.
       *
       * NOTE: Renouncing ownership will leave the contract without an owner,
       * thereby removing any functionality that is only available to the owner.
       */
      function renounceOwnership() public virtual onlyOwner {
          _transferOwnership(address(0));
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Can only be called by the current owner.
       */
      function transferOwnership(address newOwner) public virtual onlyOwner {
          require(newOwner != address(0), "Ownable: new owner is the zero address");
          _transferOwnership(newOwner);
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Internal function without access restriction.
       */
      function _transferOwnership(address newOwner) internal virtual {
          address oldOwner = _owner;
          _owner = newOwner;
          emit OwnershipTransferred(oldOwner, newOwner);
      }
  }
  
  // File: @openzeppelin/contracts/utils/Address.sol
  
  /**
   * @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
       * ====
       *
       * [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://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
       *
       * IMPORTANT: because control is transferred to `recipient`, care must be
       * taken to not create reentrancy vulnerabilities. Consider using
       * {ReentrancyGuard} or the
       * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
       */
      function sendValue(address payable recipient, uint256 amount) internal {
          require(address(this).balance >= amount, "Address: insufficient balance");
  
          (bool success, ) = recipient.call{value: amount}("");
          require(success, "Address: unable to send value, recipient may have reverted");
      }
  
      /**
       * @dev Performs a Solidity function call using a low level `call`. A
       * plain `call` is an unsafe replacement for a function call: use this
       * function instead.
       *
       * If `target` reverts with a revert reason, it is bubbled up by this
       * function (like regular Solidity function calls).
       *
       * Returns the raw returned data. To convert to the expected return value,
       * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
       *
       * Requirements:
       *
       * - `target` must be a contract.
       * - calling `target` with `data` must not revert.
       *
       * _Available since v3.1._
       */
      function functionCall(address target, bytes memory data) internal returns (bytes memory) {
          return functionCallWithValue(target, data, 0, "Address: low-level call failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
       * `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCall(
          address target,
          bytes memory data,
          string memory errorMessage
      ) internal returns (bytes memory) {
          return functionCallWithValue(target, data, 0, errorMessage);
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but also transferring `value` wei to `target`.
       *
       * Requirements:
       *
       * - the calling contract must have an ETH balance of at least `value`.
       * - the called Solidity function must be `payable`.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
          address target,
          bytes memory data,
          uint256 value
      ) internal returns (bytes memory) {
          return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
       * with `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
          address target,
          bytes memory data,
          uint256 value,
          string memory errorMessage
      ) internal returns (bytes memory) {
          require(address(this).balance >= value, "Address: insufficient balance for call");
          (bool success, bytes memory returndata) = target.call{value: value}(data);
          return verifyCallResultFromTarget(target, success, returndata, errorMessage);
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but performing a static call.
       *
       * _Available since v3.3._
       */
      function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
          return functionStaticCall(target, data, "Address: low-level static call failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
       * but performing a static call.
       *
       * _Available since v3.3._
       */
      function functionStaticCall(
          address target,
          bytes memory data,
          string memory errorMessage
      ) internal view returns (bytes memory) {
          (bool success, bytes memory returndata) = target.staticcall(data);
          return verifyCallResultFromTarget(target, success, returndata, errorMessage);
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but performing a delegate call.
       *
       * _Available since v3.4._
       */
      function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
          return functionDelegateCall(target, data, "Address: low-level delegate call failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
       * but performing a delegate call.
       *
       * _Available since v3.4._
       */
      function functionDelegateCall(
          address target,
          bytes memory data,
          string memory errorMessage
      ) internal returns (bytes memory) {
          (bool success, bytes memory returndata) = target.delegatecall(data);
          return verifyCallResultFromTarget(target, success, returndata, errorMessage);
      }
  
      /**
       * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
       * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
       *
       * _Available since v4.8._
       */
      function verifyCallResultFromTarget(
          address target,
          bool success,
          bytes memory returndata,
          string memory errorMessage
      ) internal view returns (bytes memory) {
          if (success) {
              if (returndata.length == 0) {
                  // only check isContract if the call was successful and the return data is empty
                  // otherwise we already know that it was a contract
                  require(isContract(target), "Address: call to non-contract");
              }
              return returndata;
          } else {
              _revert(returndata, errorMessage);
          }
      }
  
      /**
       * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
       * revert reason or using the provided one.
       *
       * _Available since v4.3._
       */
      function verifyCallResult(
          bool success,
          bytes memory returndata,
          string memory errorMessage
      ) internal pure returns (bytes memory) {
          if (success) {
              return returndata;
          } else {
              _revert(returndata, errorMessage);
          }
      }
  
      function _revert(bytes memory returndata, string memory errorMessage) private pure {
          // Look for revert reason and bubble it up if present
          if (returndata.length > 0) {
              // The easiest way to bubble the revert reason is using memory via assembly
              /// @solidity memory-safe-assembly
              assembly {
                  let returndata_size := mload(returndata)
                  revert(add(32, returndata), returndata_size)
              }
          } else {
              revert(errorMessage);
          }
      }
  }
  
  // File: @openzeppelin/contracts/token/ERC20/IERC20.sol
  
  /**
   * @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);
  }
  
  // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.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);
  }
  
  // File: renqFinanceUpdate.sol
  
  //SPDX-License-Identifier: MIT
  
  interface Aggregator {
      function latestRoundData()
          external
          view
          returns (
              uint80 roundId,
              int256 answer,
              uint256 startedAt,
              uint256 updatedAt,
              uint80 answeredInRound
          );
  }
  
  contract AiBeagle_Sale is ReentrancyGuard, Ownable {
      uint256 public presaleId;
      uint256 public USDT_MULTIPLIER;
      uint256 public ETH_MULTIPLIER;
      address public fundReceiver;
  
      struct Presale {
          uint256 startTime;
          uint256 endTime;
          uint256 price;
          uint256 nextStagePrice;
          uint256 Sold;
          uint256 tokensToSell;
          uint256 UsdtHardcap;
          uint256 amountRaised;
          bool Active;
          bool isEnableClaim;
      }
  
      struct ClaimData {
          uint256 claimAt;
          uint256 totalAmount;
          uint256 claimedAmount;
      }
  
      IERC20Metadata public USDTInterface;
      Aggregator internal aggregatorInterface;
      // https://docs.chain.link/docs/ethereum-addresses/ => (ETH / USD)
  
      mapping(uint256 => bool) public paused;
      mapping(uint256 => Presale) public presale;
      mapping(address => mapping(uint256 => ClaimData)) public userClaimData;
      mapping(address => bool) public isExcludeMinToken;
  
      uint256 public MinTokenTobuy;
      address public SaleToken;
  
      event PresaleCreated(
          uint256 indexed _id,
          uint256 _totalTokens,
          uint256 _startTime,
          uint256 _endTime
      );
  
      event PresaleUpdated(
          bytes32 indexed key,
          uint256 prevValue,
          uint256 newValue,
          uint256 timestamp
      );
  
      event TokensBought(
          address indexed user,
          uint256 indexed id,
          address indexed purchaseToken,
          uint256 tokensBought,
          uint256 amountPaid,
          uint256 timestamp
      );
  
      event TokensClaimed(
          address indexed user,
          uint256 indexed id,
          uint256 amount,
          uint256 timestamp
      );
  
      event PresaleTokenAddressUpdated(
          address indexed prevValue,
          address indexed newValue,
          uint256 timestamp
      );
  
      event PresalePaused(uint256 indexed id, uint256 timestamp);
      event PresaleUnpaused(uint256 indexed id, uint256 timestamp);
  
      constructor(
          address _oracle,
          address _usdt,
          address _SaleToken,
          uint256 _MinTokenTobuy
      ) {
          aggregatorInterface = Aggregator(_oracle);
          SaleToken = _SaleToken;
          MinTokenTobuy = _MinTokenTobuy;
          USDTInterface = IERC20Metadata(_usdt);
          ETH_MULTIPLIER = (10**18);
          USDT_MULTIPLIER =(10**6) ;
          fundReceiver = msg.sender;
      }
  
      function ChangeTokenToSell(address _token) public onlyOwner {
          SaleToken = _token;
      }
  
      function EditMinTokenToBuy(uint256 _amount) public onlyOwner {
          MinTokenTobuy = _amount;
      }
  
      // /**
      //  * @dev Creates a new presale
      //  * @param _price Per token price multiplied by (10**18)
      //  * @param _tokensToSell No of tokens to sell
      //  */
      function createPresale(uint256 _price,uint256 _nextStagePrice, uint256 _tokensToSell, uint256 _UsdtHardcap)
          external
          onlyOwner
      {
          require(_price > 0, "Zero price");
          require(_tokensToSell > 0, "Zero tokens to sell");
          require(presale[presaleId].Active == false, "Previous Sale is Active");
  
          presaleId++;
  
          presale[presaleId] = Presale(
              0,
              0,
              _price,
              _nextStagePrice,
              0,
              _tokensToSell,
              _UsdtHardcap,
              0,
              false,
              false
          );
  
          emit PresaleCreated(presaleId, _tokensToSell, 0, 0);
      }
  
      function startPresale() public onlyOwner {
          presale[presaleId].startTime = block.timestamp;
          presale[presaleId].Active = true;
      }
  
      function endPresale() public onlyOwner {
          require(
              presale[presaleId].Active = true,
              "This presale is already Inactive"
          );
          presale[presaleId].endTime = block.timestamp;
          presale[presaleId].Active = false;
      }
  
      // @dev enabel Claim amount
      function enableClaim(uint256 _id, bool _status)
          public
          checkPresaleId(_id)
          onlyOwner
      {
          presale[_id].isEnableClaim = _status;
      }
  
      // /**
      //  * @dev Update a new presale
      //  * @param _price Per USD price should be multiplied with token decimals
      //  * @param _tokensToSell No of tokens to sell without denomination. If 1 million tokens to be sold then - 1_000_000 has to be passed
      //  */
      function updatePresale(
          uint256 _id,
          uint256 _price,
          uint256 _nextStagePrice,
          uint256 _tokensToSell,
          uint256 _Hardcap
      ) external checkPresaleId(_id) onlyOwner {
          require(_price > 0, "Zero price");
          require(_tokensToSell > 0, "Zero tokens to sell");
          presale[_id].price = _price;
          presale[_id].nextStagePrice = _nextStagePrice;
          presale[_id].tokensToSell = _tokensToSell;
          presale[_id].UsdtHardcap =_Hardcap;
      }
  
      /**
       * @dev To update the fund receiving wallet
       * @param _wallet address of wallet to update
  
       */
      function changeFundWallet(address _wallet) external onlyOwner {
          require(_wallet != address(0), "Invalid parameters");
          fundReceiver = _wallet;
      }
  
      /**
       * @dev To update the USDT Token address
       * @param _newAddress Sale token address
       */
      function changeUSDTToken(address _newAddress) external onlyOwner {
          require(_newAddress != address(0), "Zero token address");
          USDTInterface = IERC20Metadata(_newAddress);
      }
  
      /**
       * @dev To pause the presale
       * @param _id Presale id to update
       */
      function pausePresale(uint256 _id) external checkPresaleId(_id) onlyOwner {
          require(!paused[_id], "Already paused");
          paused[_id] = true;
          emit PresalePaused(_id, block.timestamp);
      }
  
      /**
       * @dev To unpause the presale
       * @param _id Presale id to update
       */
      function unPausePresale(uint256 _id)
          external
          checkPresaleId(_id)
          onlyOwner
      {
          require(paused[_id], "Not paused");
          paused[_id] = false;
          emit PresaleUnpaused(_id, block.timestamp);
      }
  
      /**
       * @dev To get latest ethereum price in 10**18 format
       */
      function getLatestPrice() public view returns (uint256) {
          (, int256 price, , , ) = aggregatorInterface.latestRoundData();
          price = (price * (10**10));
          return uint256(price);
      }
  
      modifier checkPresaleId(uint256 _id) {
          require(_id > 0 && _id <= presaleId, "Invalid presale id");
          _;
      }
  
      modifier checkSaleState(uint256 _id, uint256 amount) {
          require(
              block.timestamp >= presale[_id].startTime &&
                  presale[_id].Active == true,
              "Invalid time for buying"
          );
          require(
              amount > 0 && amount <= presale[_id].tokensToSell-presale[_id].Sold,
              "Invalid sale amount"
          );
          _;
      }
  
      function ExcludeAccouctFromMinBuy(address _user, bool _status)
          external
          onlyOwner
      {
          isExcludeMinToken[_user] = _status;
      }
  
      /**
       * @dev To buy into a presale using USDT
       * @param usdAmount Usdt amount to buy tokens
       */
      function buyWithUSDT(uint256 usdAmount)
          external
          checkPresaleId(presaleId)
          checkSaleState(presaleId, usdtToTokens(presaleId, usdAmount))
          returns (bool)
      {
          require(!paused[presaleId], "Presale paused");
          require(presale[presaleId].Active == true, "Presale is not active yet");
          require(presale[presaleId].amountRaised + usdAmount <= presale[presaleId].UsdtHardcap,
          "Amount should be less than leftHardcap");
  
          uint256 tokens = usdtToTokens(presaleId, usdAmount);
          presale[presaleId].Sold += tokens;
          presale[presaleId].amountRaised += usdAmount;
  
          if (isExcludeMinToken[msg.sender] == false) {
              require(tokens >= MinTokenTobuy, "Less than min amount");
          }
          if (userClaimData[_msgSender()][presaleId].totalAmount > 0) {
              userClaimData[_msgSender()][presaleId].totalAmount += tokens;
          } else {
              userClaimData[_msgSender()][presaleId] = ClaimData(0, tokens, 0);
          }
  
          uint256 ourAllowance = USDTInterface.allowance(
              _msgSender(),
              address(this)
          );
          require(usdAmount <= ourAllowance, "Make sure to add enough allowance");
          (bool success, ) = address(USDTInterface).call(
              abi.encodeWithSignature(
                  "transferFrom(address,address,uint256)",
                  _msgSender(),
                  fundReceiver,
                  usdAmount
              )
          );
          require(success, "Token payment failed");
          emit TokensBought(
              _msgSender(),
              presaleId,
              address(USDTInterface),
              tokens,
              usdAmount,
              block.timestamp
          );
          return true;
      }
  
      /**
       * @dev To buy into a presale using ETH
       */
      function buyWithEth()
          external
          payable
          checkPresaleId(presaleId)
          checkSaleState(presaleId, ethToTokens(presaleId, msg.value))
          nonReentrant
          returns (bool)
      {
          uint256 usdAmount = (msg.value * getLatestPrice() * USDT_MULTIPLIER) / (ETH_MULTIPLIER * ETH_MULTIPLIER);
          require(presale[presaleId].amountRaised + usdAmount <= presale[presaleId].UsdtHardcap,
          "Amount should be less than leftHardcap");
  
          require(!paused[presaleId], "Presale paused");
          require(presale[presaleId].Active == true, "Presale is not active yet");
  
          uint256 tokens = usdtToTokens(presaleId, usdAmount);
          if (isExcludeMinToken[msg.sender] == false) {
              require(tokens >= MinTokenTobuy, "Insufficient amount!");
          }
          presale[presaleId].Sold += tokens;
          presale[presaleId].amountRaised += usdAmount;
  
          if (userClaimData[_msgSender()][presaleId].totalAmount > 0) {
              userClaimData[_msgSender()][presaleId].totalAmount += tokens;
          } else {
              userClaimData[_msgSender()][presaleId] = ClaimData(
                  0, // Last claimed at
                  tokens, // total tokens to be claimed
                  0 // claimed amount
              );
          }
  
          sendValue(payable(fundReceiver), msg.value);
          emit TokensBought(
              _msgSender(),
              presaleId,
              address(0),
              tokens,
              msg.value,
              block.timestamp
          );
          return true;
      }
  
      /**
       * @dev Helper funtion to get ETH price for given amount
       * @param _id Presale id
       * @param amount No of tokens to buy
       */
      function ethBuyHelper(uint256 _id, uint256 amount)
          external
          view
          checkPresaleId(_id)
          returns (uint256 ethAmount)
      {
          uint256 usdPrice = (amount * presale[_id].price);
          ethAmount = (usdPrice * ETH_MULTIPLIER) / (getLatestPrice() * 10**IERC20Metadata(SaleToken).decimals());
      }
  
      /**
       * @dev Helper funtion to get USDT price for given amount
       * @param _id Presale id
       * @param amount No of tokens to buy
       */
      function usdtBuyHelper(uint256 _id, uint256 amount)
          external
          view
          checkPresaleId(_id)
          returns (uint256 usdPrice)
      {
          usdPrice = (amount * presale[_id].price) / 10**IERC20Metadata(SaleToken).decimals();
      }
  
      /**
       * @dev Helper funtion to get tokens for eth amount
       * @param _id Presale id
       * @param amount No of eth
       */
      function ethToTokens(uint256 _id, uint256 amount)
          public
          view
          returns (uint256 _tokens)
      {
          uint256 usdAmount = amount * getLatestPrice() * USDT_MULTIPLIER / (ETH_MULTIPLIER * ETH_MULTIPLIER);
          _tokens = usdtToTokens(_id, usdAmount);
      }
  
      /**
       * @dev Helper funtion to get tokens for given usdt amount
       * @param _id Presale id
       * @param amount No of usdt
       */
      function usdtToTokens(uint256 _id, uint256 amount)
          public
          view
          checkPresaleId(_id)
          returns (uint256 _tokens)
      {
          _tokens = (amount * presale[_id].price) / USDT_MULTIPLIER;
      }
  
      function sendValue(address payable recipient, uint256 amount) internal {
          require(address(this).balance >= amount, "Low balance");
          (bool success, ) = recipient.call{value: amount}("");
          require(success, "ETH Payment failed");
      }
  
      function unlockToken(uint256 _id)
          public
          view
          checkPresaleId(_id)
          onlyOwner
      {
          require(
              block.timestamp >= presale[_id].endTime,
              "You can only unlock on finalize"
          );
      }
  
      /**
       * @dev Helper funtion to get claimable tokens for a given presale.
       * @param user User address
       * @param _id Presale id
       */
      function claimableAmount(address user, uint256 _id)
          public
          view
          checkPresaleId(_id)
          returns (uint256)
      {
          ClaimData memory _user = userClaimData[user][_id];
  
          require(_user.totalAmount > 0, "Nothing to claim");
          uint256 amount = _user.totalAmount - _user.claimedAmount;
          require(amount > 0, "Already claimed");
          return amount;
      }
  
      /**
       * @dev To claim token from a presale
       * @param _id Presale id
       */
      function claimAmount(uint256 _id)
          public
          checkPresaleId(_id)
          returns (bool)
      {
          uint256 amount = claimableAmount(msg.sender, _id);
          
          require(amount > 0, "Zero claim amount");
          require(
              SaleToken != address(0),
              "Presale token address not set"
          );
          require(
              amount <= IERC20(SaleToken).balanceOf(address(this)),
              "Not enough tokens in the contract"
          );
  
          require((presale[_id].isEnableClaim == true), "Claim is not enable");
  
          userClaimData[msg.sender][_id].claimAt = block.timestamp;
  
          userClaimData[msg.sender][_id].claimedAmount += amount;
  
          bool status = IERC20(SaleToken).transfer(msg.sender, amount);
          require(status, "Token transfer failed");
          emit TokensClaimed(msg.sender, _id, amount, block.timestamp);
  
          return true;
      }
  
      /**
       * @dev To claim tokens from a multiple presale
       * @param _id Presale id
       */
      function claimMultiple(uint256[] calldata _id) external returns (bool) {
          require(_id.length > 0, "Zero ID length");
          for (uint256 i; i < _id.length; i++) {
              require(claimAmount(_id[i]), "Claim failed");
          }
          return true;
      }
  
      function WithdrawTokens(address _token, uint256 amount) external onlyOwner {
          IERC20(_token).transfer(fundReceiver, amount);
      }
  
      function WithdrawContractFunds(uint256 amount) external onlyOwner {
          sendValue(payable(fundReceiver), amount);
      }
  }