// File: IPancakeRouterV2.sol



pragma solidity 0.8.5;

interface IPancakeRouter01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
    external
    payable
    returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
    external
    returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
    external
    returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
    external
    payable
    returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IPancakeRouter02 is IPancakeRouter01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

interface IPancakeFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}
// File: Context.sol



pragma solidity >= 0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
// File: Ownable.sol



pragma solidity >= 0.8.0;


/**
 * @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: IERC20.sol



pragma solidity >= 0.8.0;

/**
 * @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);

    /**
     * @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 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: 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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    modifier isHuman() {
        require(tx.origin == msg.sender, "Humans only");
        _;
    }
}
// File: @openzeppelin/contracts/utils/math/SafeMath.sol


// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File: HULKStake.sol

//SPDX-License-Identifier: MIT

pragma solidity >= 0.8.0;






contract HULKStake is Ownable, ReentrancyGuard {
    using SafeMath for uint256;

    uint256 public DECIMALS = 18;   
    IPancakeRouter02 internal _router;
    //address of the token
    IERC20 public HULK;
    uint256 poolFee = 3; // fee deducted from, deposits, withdrawals
    uint256 public earlyWithdrawFee = 10;
    uint256 public earlyWithdrawFeeTime = 3 days;

    address public devWallet = 0x2E8c54dE18F9f12caab6C0Ddf82b4711F591b6C2;

    struct userStakeProfile {
        uint256 stakedAmount;
        uint256 claimedAmount;
        uint256 lastBlockCompounded;
        uint256 lastBlockStaked;
    }
    
    mapping (address => userStakeProfile) public stakings;
    uint256 public ETHPerBlock;
    uint256 public totalUsers;
    uint256 public totalStaked;
    uint256 public totalClaimed;
  
    event StakeUpdated (address indexed recipeint, uint256 indexed _amount);
    
    constructor () {
        
        setRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        HULK = IERC20(0x91a5de30e57831529a3c1aF636A78a7E4E83f3aa);
        setETHPerBlock(40000000000000); // set ETH per block to 0.00004 ETH. ~6646 blocks in 24h. 0.00004 x 6646 = 0.26584 ETH 
          
    }

    function setRouter(address routerAddress) public onlyOwner {
		require(routerAddress != address(0), "Cannot use the zero address as router address");
		_router = IPancakeRouter02(routerAddress);
	}

    function totalPoolReserve() public view returns(uint256){
        return address(this).balance;
    }

    	function swapETHForTokens(address to, address token, uint256 ETHAmount) internal returns(bool) { 
		// Generate pair for WETH -> Future
		address[] memory path = new address[](2);
		path[0] = _router.WETH();
		path[1] = token;
        
		// Swap and send the tokens to the 'to' address
		try _router.swapExactETHForTokensSupportingFeeOnTransferTokens{ value: ETHAmount }(0, path, to, block.timestamp + 360) { 
			return true;
		} 
		catch { 
			return false;
		}
	}

    // Set reward amount per block
    function setETHPerBlock (uint256 _amount) public onlyOwner {
        require(_amount >= 0, "HULK per Block can not be negative" );
        ETHPerBlock = _amount;
    }

    /// Stake the provided amount
    function enterStaking (uint256 _amount) public isHuman {
        require(HULK.balanceOf(msg.sender) >= _amount, "Insufficient HULK tokens for transfer");
        require(_amount > 0,"Invalid staking amount");
        require(totalPoolReserve() > 0, "Reward Pool Exhausted");
        
        HULK.transferFrom(msg.sender, address(this), _amount);
        _amount = takeHULKPoolFee(_amount);

        userStakeProfile memory profile = stakings[msg.sender];

        if(profile.stakedAmount == 0){
            profile.lastBlockCompounded = block.number;
            totalUsers++;
        }
            profile.stakedAmount += _amount;
            profile.lastBlockStaked = block.number;

            totalStaked += _amount;
        
        stakings[msg.sender] = profile; 
    }

    //leaves staking 
    function leaveStaking (uint256 _amount) public isHuman {
        userStakeProfile memory profile = stakings[msg.sender];
        require(profile.stakedAmount >= _amount, "Withdraw amount can not be greater than stake");

        totalStaked -= _amount;
        profile.stakedAmount -= _amount;
        stakings[msg.sender] = profile;

        // claim pending reward
            if(getReward(msg.sender) > 0){
                claim();   
            }
            
        if(block.number < stakings[msg.sender].lastBlockStaked.add(earlyWithdrawFeeTime)){
            uint256 withdrawalFee = _amount * earlyWithdrawFee / 100;
            _amount -= withdrawalFee;
            HULK.transfer(devWallet, withdrawalFee);
        }else{
            _amount = takeHULKPoolFee(_amount);
        }

        profile.lastBlockCompounded = block.number;
        HULK.transfer(msg.sender, _amount);

        //remove
        if(stakings[msg.sender].stakedAmount == 0){
            totalUsers--;
            delete stakings[msg.sender];
        }
    }
    
    // gets reward amount from a user
    function getReward(address _address) internal view returns (uint256) {

        if(block.number <= stakings[_address].lastBlockCompounded){
            return 0;
        }else {
            uint256 totalPool = totalPoolReserve();
            if(totalPool == 0 || totalStaked == 0 ){
                return 0;
            }else {    

                uint256 blocks = block.number.sub(stakings[_address].lastBlockCompounded);
                //if the staker reward is greater than total pool => set it to total pool
                uint256 totalReward = blocks.mul(ETHPerBlock);
                uint256 stakerReward = totalReward.mul(stakings[_address].stakedAmount).div(totalStaked);
                if(stakerReward > totalPool){
                    stakerReward = totalPool;
                }
                return stakerReward;
            }
            
        }
    }

    /// Get pending rewards of a user to display on DAPP, even if farming is disabled it shows remaining balance
    function pendingReward (address _address) public view returns (uint256){
        return getReward(_address);
    }

    /// transfers the rewards of a user to their address
    function claim() public isHuman{

        uint256 reward = getReward(msg.sender);
        (bool os, ) = payable(msg.sender).call{value: reward}("");
        require(os,"failed claim");
        stakings[msg.sender].claimedAmount = stakings[msg.sender].claimedAmount.add(reward);
        stakings[msg.sender].lastBlockCompounded = block.number;
        totalClaimed = totalClaimed.add(reward);
    }

     /// compounds the rewards of the caller, buys more HULK and stakes that
    function singleCompound() public isHuman {
        require(stakings[msg.sender].stakedAmount > 0, "Please Stake HULK to compound");
        
        uint256 reward = getReward(msg.sender);
        reward = takeETHPoolFee(reward); 

        // swap reward to extra tokens and log
   	    uint256 initialBalance = HULK.balanceOf(address(this));
        require(swapETHForTokens(address(this), address(HULK), reward),"swapping failed");
        uint256 addedBalance = HULK.balanceOf(address(this)) - initialBalance;

        // add extra tokens
        stakings[msg.sender].stakedAmount += addedBalance; 
        totalStaked += addedBalance;
        stakings[msg.sender].lastBlockCompounded = block.number;
        totalClaimed = totalClaimed.add(reward);

        emit StakeUpdated(msg.sender,reward);
    }

    // update ecosystem wallet
    function updatedevWallet(address wallet) public onlyOwner{
        devWallet = wallet;
    }

    // update pool fee
    function updatePoolFee(uint256 _amount) public onlyOwner{
       poolFee = _amount;
    }
    
    // remove ETH from totalpool in case of emergency/migration
    function migratePool() public payable onlyOwner {
        (bool os, ) = payable(devWallet).call{value: totalPoolReserve()}("");
        require(os);
    }

    // sends ETH fee and returns remaining reward for user
    function takeETHPoolFee(uint256 reward) internal view returns(uint256){
        uint256 Fee = reward / 100 * poolFee; // take fee 
        reward -= Fee;
		devWallet.call{value:Fee};
        return reward;
    }

    // sends HULK fee and burns a portion of it
    function takeHULKPoolFee(uint256 reward) internal returns(uint256){

        uint256 Fee = reward / 100 * poolFee; // take fee 
        reward -= Fee;
        HULK.transfer(devWallet,Fee);

        return reward;
    }

    function returnStakeData() public view returns (bytes memory) {
        return abi.encode(HULK.balanceOf(msg.sender), stakings[msg.sender].stakedAmount, pendingReward(msg.sender), totalPoolReserve(), totalUsers, totalClaimed, totalStaked,ETHPerBlock);
    }

    // Ensures that the contract is able to receive ETH and adds it to the total pool
    receive() external payable {}
}