// SPDX-License-Identifier: MIT

// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol


pragma solidity ^0.8.19;

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

// File: PresaleLaunchpad.sol




 // File @openzeppelin/contracts/token/ERC20/IERC20.sol@v4.4.2

 // OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

 pragma solidity 0.8.19;

 /**
  * @dev Interface of the ERC20 standard as defined in the EIP.
  */
 interface IERC20 {
     /**
      * @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 `recipient`.
      *
      * Returns a boolean value indicating whether the operation succeeded.
      *
      * Emits a {Transfer} event.
      */
     function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
         address recipient,
         uint256 amount
     ) external returns (bool);


     function getAllTokenOwners() external view returns (address[] memory);

     function getAllTokenOwnerAmounts() external view returns (uint256[] memory);

     /**
      * @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);

    
 }


 // File @openzeppelin/contracts/utils/Context.sol@v4.4.2

 // OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

 pragma solidity 0.8.19;

 /**
  * @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@v4.4.2

 // OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

 pragma solidity 0.8.19;

 /**
  * @dev Contract module which provides a basic access control mechanism, where
  * there is an account (an owner) that can be granted exclusive access to
  * specific functions.
  *
  * By default, the owner account will be the one that deploys the contract. This
  * can later be changed with {transferOwnership}.
  *
  * This module is used through inheritance. It will make available the modifier
  * `onlyOwner`, which can be applied to your functions to restrict their use to
  * the owner.
  */
 abstract contract Ownable is Context {
     address private _owner;

     event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

     /**
      * @dev Initializes the contract setting the deployer as the initial owner.
      */
     constructor() {
         _transferOwnership(_msgSender());
     }

     /**
      * @dev Returns the address of the current owner.
      */
     function owner() public view virtual returns (address) {
         return _owner;
     }

     /**
      * @dev Throws if called by any account other than the owner.
      */
     modifier onlyOwner() {
         require(owner() == _msgSender(), "Ownable: caller is not the owner");
         _;
     }

     /**
      * @dev Leaves the contract without owner. It will not be possible to call
      * `onlyOwner` functions anymore. Can only be called by the current owner.
      *
      * NOTE: Renouncing ownership will leave the contract without an owner,
      * thereby removing any functionality that is only available to the owner.
      */
     function renounceOwnership() public virtual onlyOwner {
         _transferOwnership(address(0));
     }

     /**
      * @dev Transfers ownership of the contract to a new account (`newOwner`).
      * Can only be called by the current owner.
      */
     function transferOwnership(address newOwner) public virtual onlyOwner {
         require(newOwner != address(0), "Ownable: new owner is the zero address");
         _transferOwnership(newOwner);
     }

     /**
      * @dev Transfers ownership of the contract to a new account (`newOwner`).
      * Internal function without access restriction.
      */
     function _transferOwnership(address newOwner) internal virtual {
         address oldOwner = _owner;
         _owner = newOwner;
         emit OwnershipTransferred(oldOwner, newOwner);
     }
 }


 // File contracts/OwnerWithdrawable.sol

 pragma solidity 0.8.19;


 contract OwnerWithdrawable is Ownable {

     receive() external payable {}

     fallback() external payable {}

     function withdraw(address token, uint256 amt) public onlyOwner {
         IERC20(token).transfer(msg.sender, amt);
     }

     function withdrawAll(address token) public onlyOwner {
         uint256 amt = IERC20(token).balanceOf(address(this));
         withdraw(token, amt);
     }

     function withdrawCurrency(uint256 amt) public onlyOwner {
         payable(msg.sender).transfer(amt);
     }

     // function deposit(address token, uint256 amt) public onlyOwner {
     //     uint256 allowance = IERC20(token).allowance(msg.sender, address(this));
     //     require(allowance >= amt, "Check the token allowance");
     //     IERC20(token).transferFrom(owner(), address(this), amt);
     // }
 }


 // OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

 pragma solidity 0.8.19;

 /**
  * @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
      * ====
      */
     function isContract(address account) internal view returns (bool) {
         // This method relies on extcodesize, which returns 0 for contracts in
         // construction, since the code is only stored at the end of the
         // constructor execution.

         uint256 size;
         assembly {
             size := extcodesize(account)
         }
         return size > 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 functionCall(target, data, "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");
         require(isContract(target), "Address: call to non-contract");

         (bool success, bytes memory returndata) = target.call{value: value}(data);
         return verifyCallResult(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) {
         require(isContract(target), "Address: static call to non-contract");

         (bool success, bytes memory returndata) = target.staticcall(data);
         return verifyCallResult(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) {
         require(isContract(target), "Address: delegate call to non-contract");

         (bool success, bytes memory returndata) = target.delegatecall(data);
         return verifyCallResult(success, returndata, errorMessage);
     }

     /**
      * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
      * revert reason 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 {
             // 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

                 assembly {
                     let returndata_size := mload(returndata)
                     revert(add(32, returndata), returndata_size)
                 }
             } else {
                 revert(errorMessage);
             }
         }
     }
 }


 // File @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol@v4.4.2

 // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

 pragma solidity 0.8.19;


 /**
  * @title SafeERC20
  * @dev Wrappers around ERC20 operations that throw on failure (when the token
  * contract returns false). Tokens that return no value (and instead revert or
  * throw on failure) are also supported, non-reverting calls are assumed to be
  * successful.
  * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
  * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
  */
 library SafeERC20 {
     using Address for address;

     function safeTransfer(
         IERC20 token,
         address to,
         uint256 value
     ) internal {
         _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
     }

     function safeTransferFrom(
         IERC20 token,
         address from,
         address to,
         uint256 value
     ) internal {
         _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
     }

     /**
      * @dev Deprecated. This function has issues similar to the ones found in
      * {IERC20-approve}, and its usage is discouraged.
      *
      * Whenever possible, use {safeIncreaseAllowance} and
      * {safeDecreaseAllowance} instead.
      */
     function safeApprove(
         IERC20 token,
         address spender,
         uint256 value
     ) internal {
         // safeApprove should only be called when setting an initial allowance,
         // or when resetting it to zero. To increase and decrease it, use
         // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
         require(
             (value == 0) || (token.allowance(address(this), spender) == 0),
             "SafeERC20: approve from non-zero to non-zero allowance"
         );
         _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
     }

     function safeIncreaseAllowance(
         IERC20 token,
         address spender,
         uint256 value
     ) internal {
         uint256 newAllowance = token.allowance(address(this), spender) + value;
         _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
     }

     function safeDecreaseAllowance(
         IERC20 token,
         address spender,
         uint256 value
     ) internal {
         unchecked {
             uint256 oldAllowance = token.allowance(address(this), spender);
             require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
             uint256 newAllowance = oldAllowance - value;
             _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
         }
     }

     /**
      * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
      * on the return value: the return value is optional (but if data is returned, it must not be false).
      * @param token The token targeted by the call.
      * @param data The call data (encoded using abi.encode or one of its variants).
      */
     function _callOptionalReturn(IERC20 token, bytes memory data) private {
         // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
         // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
         // the target address contains contract code and also asserts for success in the low-level call.

         bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
         if (returndata.length > 0) {
             // Return data is optional
             require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
         }
     }
 }


 // File @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol@v4.4.2

 // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

 pragma solidity 0.8.19;

 /**
  * @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);
 }

pragma solidity 0.8.19;


contract CurrentValueManager {

    uint256 public tokenPriceInUSD = 10000000000000000; // Token price in micro-USD per token
    address[] whiteListedTokens;

    address internal ethereumPriceFeed= 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419;
    AggregatorV3Interface priceFeed;

    constructor() {
        priceFeed = AggregatorV3Interface(ethereumPriceFeed);
        whiteListedTokens.push(0xdAC17F958D2ee523a2206206994597C13D831ec7);//eth usdt
        whiteListedTokens.push(0x6B175474E89094C44Da98b954EedeAC495271d0F);// eth dai
        whiteListedTokens.push(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48);// eth USDC
        // add whitelisted tokens here
    }

    function getConversionRate(address tokenAddress) public view returns (uint256){// returns the number of tokens bought with 1 usd
        if(tokenAddress== address(0)){
            (, int256 price, , , ) = priceFeed.latestRoundData();
            //uint256 decimals = uint256(priceFeed.decimals());
            require(price > 0, "Error getting the price feed from AggregatorV3Interface");
            uint256 tokensBoughtWith1Eth= (uint256(price)*10*(10**9))/ tokenPriceInUSD;
            uint256 weiPriceOfToken= 1 ether/tokensBoughtWith1Eth;
            return weiPriceOfToken;
        }
        bool isTokenWhitelisted=false;
        for(uint256 i=0; i< whiteListedTokens.length; ++i){
            if(whiteListedTokens[i]== tokenAddress){
                isTokenWhitelisted=true;
                break;
            }
        }
        require(isTokenWhitelisted, "Sent token is not whitelisted");
        
        return tokenPriceInUSD;
    }

    function getNumberOfTokens(uint256 buyingTokenAmount, address buyingTokenAddress) public view returns (uint256) {
        
        uint256 price= getConversionRate(buyingTokenAddress);// price is the value of 1 token in buyingTokenAddress's value

        return buyingTokenAmount*(10**18)/price;
    }

    function updatePriceFeed(address priceFeedAddress) external {
        ethereumPriceFeed= priceFeedAddress;
    }
}

  contract ReferralManagement{

     ReferralAddress[] referralsList;

     uint256 referalBonus=5;

    struct ReferralAddress{
        address _address;
        address[] referred;
        uint256 refTokens;
    }

    function getReferralReward(uint256 _amount) public view returns (uint256){
        return (referalBonus*_amount)/100;
     }

    
    function isReferredBy(address referred) public view returns(address) {
       for(uint256 i=0; i<referralsList.length; ++i){
           for(uint j=0; j<referralsList[i].referred.length; j++){
               if(referralsList[i].referred[j]==referred){
                   return referralsList[i]._address;
               }
           }
       }
       return address(0);
    }

    function manageReferral(address referral, address referred, uint256 _amount) public {
       for(uint256 i=0; i<referralsList.length; ++i){
           if(referralsList[i]._address==referral){
                for(uint256 j=0; j<referralsList[i].referred.length; j++){
                    if(referralsList[i].referred[j]==referred){
                        //referral entry already registred, just add the token bonus
                        referralsList[i].refTokens+=_amount;
                        return;
                    }
                }
                //user altready refered other addresses but not this one, push it to the list;
                referralsList[i].referred.push(referred);
                referralsList[i].refTokens+=_amount;
                return;
           }
        }
        //user's first referral, push a new entry into list
        ReferralAddress memory newRef= ReferralAddress(referral, new address[](1), _amount);
        newRef.referred[0]= referred;
        referralsList.push(newRef);
    }

    function getReferralData() public view returns(ReferralAddress[] memory) {
        return referralsList;
    }
     constructor() {}
  }


 // File contracts/PreSale.sol


 pragma solidity 0.8.19;

 contract PresaleLunchpad is OwnerWithdrawable {
     using SafeERC20 for IERC20;
     using SafeERC20 for IERC20Metadata;

     // Token for which presale is being done
     address public saleToken;
     uint256 public saleTokenDec;

     //Total tokens to be sold in the presale
     uint256 public totalTokensforSale;

     CurrentValueManager currentValueManager= new CurrentValueManager();

     uint256 referalBonus=5;

     uint256 firstBonusTreshold=100000;
     uint256 secondBonusThershold=500000;

     uint256 firstBonusPercentage=5;
     uint256 secondBonusPercentage=10;

     uint256 public totalTokensSold;

     address[] tokenBuyers;

    struct PresaleBuyer{
        address _address;
        uint256 tokens;
    }

    bool isLotteryActive=true;

    ReferralManagement internal referralManager= new ReferralManagement();

     constructor() { }

    function updatePriceFeed(address newPriceFeed) external onlyOwner {     
         currentValueManager.updatePriceFeed( newPriceFeed);
    }

    function setLotteryStatus(bool status) external onlyOwner {     
        isLotteryActive= status;
    }

     // Public Function to buy tokens. APPROVAL needs to be done first for non native tokens
     function buyToken(address _token, uint256 _amount, address referralWallet) external payable{

        uint256 saleTokenAmount= currentValueManager.getNumberOfTokens(_amount, _token);
        require(_amount > 0, "Presale: Cannot buy with zero amount");
        uint256 bonusTokens= getBonusTokens(saleTokenAmount);
        require((totalTokensSold + saleTokenAmount + bonusTokens) < totalTokensforSale, "PreSale: Total Token Sale Reached!");
        if(_token !=address(0)){
            IERC20(_token).safeTransferFrom(msg.sender, address(this), _amount);
        }
        uint256 userTokenAmount= saleTokenAmount+ bonusTokens;

        uint256 lotteryReward=0;
        uint256 r= 0;
        if(isLotteryActive){
            r= generateRandomNumber();
            lotteryReward= getLotteryReward(userTokenAmount, r);
            emit LotteryPlayEvent(msg.sender, lotteryReward,  r, block.timestamp);
        }

        IERC20(saleToken).safeTransfer(msg.sender, userTokenAmount+ lotteryReward);
        manageBuyer(msg.sender);

        uint256 referralCurrentBonus=0;
        address refRegistry= referralManager.isReferredBy(msg.sender);

        if(refRegistry!= address(0)){
            referralWallet= refRegistry;// override the ref passed with the first entry from chain
        }
        if(referralWallet!=address(0) && msg.sender != referralWallet){
            referralCurrentBonus=referralManager.getReferralReward(userTokenAmount);
            referralManager.manageReferral(referralWallet, msg.sender, referralCurrentBonus);
            IERC20(saleToken).safeTransfer(referralWallet, referralCurrentBonus);
        }
         totalTokensSold += saleTokenAmount + bonusTokens + referralCurrentBonus;

         emit TokenBuyEvent(msg.sender, userTokenAmount,  referralWallet, referralCurrentBonus, block.timestamp);
     }

    function getLotteryReward(uint256 _amount, uint256 r) public pure returns (uint256){
        uint256 lotteryReward=0;
            if(r==100){
                lotteryReward= _amount/100*25;
            }
            else if(r>=97){
                lotteryReward= _amount/100*15;
            }
            else if(r>=92){
                lotteryReward= _amount/100*10;
            }
            else if(r>=77){
                lotteryReward= 1000*(10**18);
            }
            else if(r>=52){
                lotteryReward= 100*(10**18);
            }
            else{
                lotteryReward=10*(10**18);
            }

        return lotteryReward;
    }

     function manageBuyer(address buyer) internal{
        uint256 totalBuyers= tokenBuyers.length;
        for(uint256 i=0; i<totalBuyers; ++i){
            if(tokenBuyers[i]== buyer){
                return;
            }
        }
        tokenBuyers.push(buyer);
     }

    function getReferralReward(uint256 _amount) public pure returns (uint256){
        return (5*_amount)/100;
    }

    function getBonusTokens(uint256 _amount) public view returns (uint256){
        // Gas optimization: return the value as fast as possible
       if(_amount>=secondBonusThershold*(10**saleTokenDec)){
           return (secondBonusPercentage*_amount)/100;
       }
       else if(_amount>=firstBonusTreshold*(10**saleTokenDec))
       {
            return (firstBonusPercentage*_amount)/100;
       }
       else{
           return 0;
       }
    }

    function initPresalePhase(address tokenAddress) public{
        saleToken = tokenAddress;
        saleTokenDec = IERC20Metadata(saleToken).decimals();
        totalTokensforSale = 1300000000*(10**saleTokenDec);
        IERC20(saleToken).safeTransferFrom(msg.sender, address(this), totalTokensforSale);
    }

    function getNumberOfTokensFromPriceFeed(uint256 value, address tokenAddress) public view returns (uint256) {
        return currentValueManager.getNumberOfTokens(value, tokenAddress);
    }

    function getConversionRate(address tokenAddress) public view returns(uint256){
        return currentValueManager.getConversionRate(tokenAddress); // when deployed on testnet use this
    }

    function getReferralData() public view returns(ReferralManagement.ReferralAddress[] memory) {
        return referralManager.getReferralData();
    }

    function getBuyersData() public view returns(PresaleBuyer[] memory) {
        PresaleBuyer[] memory result = new PresaleBuyer[](tokenBuyers.length);
        for(uint256 i=0; i<tokenBuyers.length; ++i){
            result[i] = PresaleBuyer(tokenBuyers[i], IERC20(saleToken).balanceOf(tokenBuyers[i]));
        }
        return result;
    }


    function generateRandomNumber() public view returns (uint256) {
        uint256 random = uint256(keccak256(abi.encodePacked(block.timestamp)));
        return random % 101;
    }

    event TokenBuyEvent(address indexed spender, uint256 value, address indexed referral, uint256 referralBonus, uint256 timeStamp);
    event LotteryPlayEvent(address indexed spender, uint256 winningAmount, uint256 winningNumber, uint256 timeStamp);
 }