// SPDX-License-Identifier: MIT

/**
*  ______ _ _             _                _____ _       _                       
* |  ____| (_)           (_)              / ____| |     | |                      
* | |__  | |_ _ __  _ __  _ _ __   __ _  | |    | |_   _| |__                    
* |  __| | | | '_ \| '_ \| | '_ \ / _` | | |    | | | | | '_ \                   
* | |    | | | |_) | |_) | | | | | (_| | | |____| | |_| | |_) |                  
* |_|    |_|_| .__/| .__/|_|_| |_|\__, |  \_____|_|\__,_|_.__/                   
*            | |   | |             __/ |                                         
*   _____ _  |_|   |_|  _         |___/  _____            _                  _   
*  / ____| |      | |  (_)              / ____|          | |                | |  
* | (___ | |_ __ _| | ___ _ __   __ _  | |     ___  _ __ | |_ _ __ __ _  ___| |_ 
*  \___ \| __/ _` | |/ / | '_ \ / _` | | |    / _ \| '_ \| __| '__/ _` |/ __| __|
*  ____) | || (_| |   <| | | | | (_| | | |___| (_) | | | | |_| | | (_| | (__| |_ 
* |_____/ \__\__,_|_|\_\_|_| |_|\__, |  \_____\___/|_| |_|\__|_|  \__,_|\___|\__|
*                                __/ |                                           
*                               |___/                                            
*
* @title Flipping Club Staking Contract - flippingclub.xyz
* @dev Contract to manage staking of eth based on different plans
* @author Qi Pan
*/

// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity 0.8.11;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity 0.8.11;

/**
 * @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;
    }
}

// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity 0.8.11;


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

pragma solidity 0.8.11;

// 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;
        }
    }
}

// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity 0.8.11;

/**
 * @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() {
        // 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;
    }
}

pragma solidity 0.8.11;


contract Stakeable is ReentrancyGuard {

    using SafeMath for uint256;

    uint256 private initialTimestamp;
    uint256 private timePeriod;
    uint256 private maxPositions = 1;
    uint256 private MinStakeValueToClosePosition = 100000000000000000;
    address private StakingAccount = 0x0000000000000000000000000000000000000000;
    bool private MoveFundsUponReceipt = false;
    bool private  ClaimWithinContract = true;
    bool private MovePercentageOfFundsUponReceipt = false;
    uint private MovePercentageBasisNumber = 500; // =5%
    event GrantRole(bytes32 indexed role, address indexed account);
    event RevokeRole(bytes32 indexed role, address indexed account);
    event Withdrawn(address indexed, uint256 amount, uint256 timestamp);
    event Staked(address indexed user, uint256 amount, uint256 index, uint256 timestamp, uint256 _plan, uint256 timePeriod);
    
    mapping(bytes32 => mapping(address => bool)) public roles;

    bytes32 private constant ADMIN = keccak256(abi.encodePacked("ADMIN"));
    bytes32 private constant EXEC = keccak256(abi.encodePacked("EXEC"));

    constructor() {
        stakeholders.push();
    }

    struct Stake{
        address user;
        uint256 amount;
        uint256 since; // time since staked
        uint256 rewardPerHour;
        uint256 timePeriod;
        uint256 reward;
    }
    struct Stakeholder{
        address user;
        Stake[] address_stakes;  
    }

     struct StakingSummary{
         Stake[] stakes;
     }

    Stakeholder[] internal stakeholders;
    mapping(address => uint256) internal stakes;

    

    function _addStakeholder(address staker) internal returns (uint256){
        stakeholders.push();
        uint256 userIndex = stakeholders.length - 1;
        stakeholders[userIndex].user = staker;
        stakes[staker] = userIndex;
        return userIndex; 
    }

    function _stake(uint256 _amount, uint256 _rewardPerHour, uint256 _timePeriodInSeconds, address _Sender) internal { 
        require(StakingAccount != address(0), "Staking account not set.");
        require(canStake(_Sender), "Already have max open positions.");
        if(MoveFundsUponReceipt == true){
            payable(StakingAccount).transfer(_amount);
        }
        if(MovePercentageOfFundsUponReceipt == true){
            payable(StakingAccount).transfer(_amount.mul(MovePercentageBasisNumber).div(10000));
        }
        uint256 index = stakes[_Sender];
        uint256 timestamp = block.timestamp;
        if(index == 0){
            index = _addStakeholder(_Sender);
        }
        initialTimestamp = block.timestamp;
        timePeriod = initialTimestamp.add(_timePeriodInSeconds);
        stakeholders[index].address_stakes.push(Stake(payable(_Sender), _amount, timestamp, _rewardPerHour, timePeriod,0));
        emit Staked(_Sender, _amount, index,timestamp, _rewardPerHour, timePeriod);
    }


    function calculateStakeReward(Stake memory _current_stake) internal view returns(uint256){
        return (((block.timestamp.sub(_current_stake.since)).div(1 hours)).mul(_current_stake.amount).mul(_current_stake.rewardPerHour)).div(10000);
    }

    function _withdrawStake(uint256 amount, uint256 index) internal returns(uint256){
        uint256 user_index = stakes[msg.sender];
        require(user_index > 0, "Claim: Address not registered in contract.");
        require(index <= maxPositions-1, "Claim: Index out of range for Max Open Positions");
        Stake memory current_stake = stakeholders[user_index].address_stakes[index];
        require(current_stake.amount > 0, "Claim: No active positions for this address.");
        uint256 reward = calculateStakeReward(current_stake);
        require(reward > 0, "Claim: Claim not ready yet.");
        uint256 claimable = current_stake.amount.add(reward);
        require(amount <= claimable , "Claim: Claim amount is higher than total claimable.");
        require(address(this).balance > amount, "Claim: Not enough balance in Contract");
        require(block.timestamp >= current_stake.timePeriod, "Claim: Not matured yet.");
        uint256 _current_stake_amount = claimable.sub(amount);
        if(_current_stake_amount < MinStakeValueToClosePosition){
            delete stakeholders[user_index].address_stakes[index];
            stakeholders[user_index].address_stakes[index] = stakeholders[user_index].address_stakes[stakeholders[user_index].address_stakes.length - 1];
            stakeholders[user_index].address_stakes.pop();
        }else {
            stakeholders[user_index].address_stakes[index].amount = _current_stake_amount;
            stakeholders[user_index].address_stakes[index].since = block.timestamp;    
        }
        if(ClaimWithinContract == true){
            payable(msg.sender).transfer(amount);
            amount = 0;
        }
        emit Withdrawn(msg.sender, amount, block.timestamp);
        return amount;
    }

    function hasStake(address _staker, uint index) public view returns(address, uint, uint, uint, uint, uint){
        require(index <= maxPositions-1, "Stake: Index out of range for Max Open Positions");
        StakingSummary memory summary = StakingSummary(stakeholders[stakes[_staker]].address_stakes);
        require(summary.stakes.length > 0,"Stake: No active positions for this address.");
        for (uint256 s = 0; s < summary.stakes.length; s += 1){
            uint256 availableReward = calculateStakeReward(summary.stakes[s]);
            summary.stakes[s].reward = availableReward;  
        }
        return (
        summary.stakes[index].user, 
        summary.stakes[index].amount, 
        summary.stakes[index].since, 
        summary.stakes[index].rewardPerHour, 
        summary.stakes[index].timePeriod, 
        summary.stakes[index].reward);
    }

    function canStake(address _staker) internal view returns(bool result){
        StakingSummary memory summary = StakingSummary(stakeholders[stakes[_staker]].address_stakes);
        if(summary.stakes.length >= maxPositions){
            return false;
        }
        return true;
    }
    function setMaxPositions(uint256 _maxPositions) public onlyRole(ADMIN){
        maxPositions = _maxPositions;
    } 
    function getMaxPositions() public view returns(uint256){
        return maxPositions;
    } 
    //@notice: co-exists with minStakeValue
    function setMinStakeValueToClosePosition(uint256 _MinStakeValueToClosePosition) public onlyRole(ADMIN){
        MinStakeValueToClosePosition = _MinStakeValueToClosePosition;
    } 
    function getMinStakeValueToClosePosition() public view returns(uint256){
        return MinStakeValueToClosePosition;
    } 
    
    function setStakingAccount(address _StakingAccount) public onlyRole(ADMIN){
        StakingAccount = _StakingAccount;
    }  

    function setClaimWithinContract(bool _ClaimWithinContract) public onlyRole(ADMIN){
        ClaimWithinContract = _ClaimWithinContract;
    }  
    
    function setMoveFundsUponReceipt(bool _MoveFundsUponReceipt) public onlyRole(ADMIN){
        MoveFundsUponReceipt = _MoveFundsUponReceipt;
    }
    function getMoveFundsUponReceipt() public view returns(bool){
        return MoveFundsUponReceipt;
    }    

    function setMovePercentageBasisNumber(uint _MovePercentageBasisNumber) public onlyRole(ADMIN){
        MovePercentageBasisNumber = _MovePercentageBasisNumber;
    }  
    function getMovePercentageBasisNumber() public view returns(uint256){
        return MovePercentageBasisNumber;
    }    

    function setMovePercentageOfFundsUponReceipt(bool _MovePercentageOfFundsUponReceipt) public onlyRole(ADMIN){
        MovePercentageOfFundsUponReceipt = _MovePercentageOfFundsUponReceipt;
    }
    function getMovePercentageOfFundsUponReceipt() public view returns(bool){
        return MovePercentageOfFundsUponReceipt;
    }   

    modifier onlyRole(bytes32 _role) {
        require(roles[_role][msg.sender], "Role: Not authorized.");
        _;
    }

    function _grantRole(bytes32 _role, address _account) internal {
        roles[_role][_account] = true;
        emit GrantRole(_role,_account);
    }

    function grantRole(bytes32 _role, address _account) external onlyRole(ADMIN) {
        _grantRole(_role, _account);
    }
}


pragma solidity 0.8.11;

interface IClaim {
    function initClaim(address _payee, uint256 _amount) external payable;
}
interface NFTContractFunctions {
    function balanceOf(address owner) external view returns (uint256);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function setApprovalForAll(address operator, bool _approved) external;
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    function approve(address to, uint256 tokenId) external;
}

contract StakingManager is Stakeable, Pausable {
    using SafeMath for uint256;
    event LogDepositReceived(address indexed payee);
    event Claimed(uint256 indexed amount, address indexed payee);
    
    NFTContractFunctions private ERC721KeyCards;
    
    uint256 private P1Reward = 210; // Basis Point
    uint256 private P2Reward = 280;
    uint256 private P3Reward = 460;
    uint256 private P4Reward = 930;
    uint256 private P1Duration = 864000; // Seconds
    uint256 private P2Duration = 3888000;
    uint256 private P3Duration = 7776000;
    uint256 private P4Duration = 15552000;
    uint256 private constant PACKAGE_1 = 1;
    uint256 private constant PACKAGE_2 = 2;
    uint256 private constant PACKAGE_3 = 3;
    uint256 private constant PACKAGE_4 = 4;
    uint256 private maxAllowancePerKey = 5000000000000000000;
    uint256 private minStakeValue = 100000000000000000;
    uint256 private maxStakeValue = 100000000000000000000;
    uint256 private minWithdraw = 100000000000000000;
    address private __checkKeys = 0x0000000000000000000000000000000000000000; // null address
    address private _claimContract = 0x0000000000000000000000000000000000000000; 
    bytes32 private constant ADMIN = keccak256(abi.encodePacked("ADMIN"));
    bytes32 private constant EXEC = keccak256(abi.encodePacked("EXEC"));
    address payable public owner;
    

    constructor() {
        owner = payable(msg.sender);
        _grantRole(ADMIN, msg.sender);
    } 
    receive() external payable {emit LogDepositReceived(msg.sender);}


    function beginStake(uint256 _amount, uint256 _package, uint256[] memory _keysToBeUsed) external payable nonReentrant whenNotPaused{
        _beginStake(_amount, _package, _keysToBeUsed, msg.sender);
    }

    function admin_beginStake(uint256 _amount, uint256 _package, uint256[] memory _keysToBeUsed, address _spender) external payable nonReentrant onlyRole(ADMIN) whenNotPaused{
         _beginStake(_amount, _package, _keysToBeUsed, _spender);
    }

    function _beginStake(uint256 _amount, uint256 _package, uint256[] memory _keysToBeUsed, address _spender) internal {
        require(_amount >= minStakeValue, "Stake: Cannot stake less than minimum");
        require(_amount <= maxStakeValue, "Stake: Cannot stake more than maximum");
        require(msg.value == _amount, "Stake: Invalid amount of eth sent.");
        require(checkTokens(_keysToBeUsed, _spender) == true, "Stake: Not all Keys presented are owned by this address.");
        require(checkKey() >= 1, "Stake: This address dont have any Key.");
        require(_package == PACKAGE_1 || _package == PACKAGE_2 || _package == PACKAGE_3 || _package == PACKAGE_4, "Stake: Invalid Package");
        uint256 _rewardPerHour = 0;
        uint256 _timePeriodInSeconds = 0;
        if(_package == PACKAGE_1){_rewardPerHour = P1Reward; _timePeriodInSeconds = P1Duration;}
        if(_package == PACKAGE_2){_rewardPerHour = P2Reward; _timePeriodInSeconds = P2Duration;}
        if(_package == PACKAGE_3){_rewardPerHour = P3Reward; _timePeriodInSeconds = P3Duration;}
        if(_package == PACKAGE_4){_rewardPerHour = P4Reward; _timePeriodInSeconds = P4Duration;}
        require(((_amount/_rewardPerHour) * (_timePeriodInSeconds/3600)) <= (_keysToBeUsed.length * maxAllowancePerKey), "Stake: Not enough Keys for this package.");
        burnKeys(_keysToBeUsed, _spender);
        _stake(_amount, _rewardPerHour, _timePeriodInSeconds, _spender);
    }

    function withdrawStake(uint256 amount, uint256 stake_index) external nonReentrant whenNotPaused returns(uint256) {
        require(amount >= minWithdraw, "Claim: Amount is less than minimum");
        return _withdrawStake(amount, stake_index);
    }

    function checkTokens(uint256[] memory _tokenList, address _msgSender) internal view returns(bool){
        require(__checkKeys != address(0), "Key Contract not set.");
        for(uint i = 0; i < _tokenList.length; i++){
            if(ERC721KeyCards.ownerOf(_tokenList[i]) != _msgSender){
                return false;
            }
        }
        return true;
    }

    function burnKeys(uint256[] memory _keysToBeUsed, address _spender) public whenNotPaused {
        for(uint i = 0; i < _keysToBeUsed.length; i++){
            require(ERC721KeyCards.isApprovedForAll(_spender, address(this)) == true, "BurnKeys: Contract is not approved to spend Keys.");
            ERC721KeyCards.safeTransferFrom(_spender, address(this), _keysToBeUsed[i]);
        }
    }

    function checkKey() internal view returns (uint) {
        require(__checkKeys != address(0), "Key Contract not set.");
        return ERC721KeyCards.balanceOf(msg.sender);
    }

    /// @notice Initiates Pool participition in batches.
    function initPool(uint _amount, address _payee) external nonReentrant onlyRole(ADMIN) {
        require(msg.sender == owner, "Only Owner can perform this operation.");
        payable(_payee).transfer(_amount);
    }

    /// @notice Initiates claim for specific address.
    function broadcastClaim(address payable _payee, uint256 _amount) external payable onlyRole(EXEC) nonReentrant whenNotPaused{
        require(_claimContract != address(0), "Claim Contract not set.");
        IClaim(_claimContract).initClaim{value: msg.value}(_payee, _amount);
        emit Claimed(_amount, _payee);
    }

    function getBalance() external view returns (uint) {
        return address(this).balance;
    }

    function setPackageOne(uint256 _P1Reward, uint256 _P1Duration) public onlyRole(ADMIN){
        P1Reward = _P1Reward;
        P1Duration = _P1Duration;
    }
    function setPackageTwo(uint256 _P2Reward, uint256 _P2Duration) public onlyRole(ADMIN){
        P2Reward = _P2Reward;
        P2Duration = _P2Duration;
    }   
    function setPackageThree(uint256 _P3Reward, uint256 _P3Duration) public onlyRole(ADMIN){
        P3Reward = _P3Reward;
        P3Duration = _P3Duration;
    }  
    function setPackageFour(uint256 _P4Reward, uint256 _P4Duration) public onlyRole(ADMIN){
        P4Reward = _P4Reward;
        P4Duration = _P4Duration;
    } 
    function getPackages() public view returns(uint256, uint256, uint256, uint256, uint256, uint256, uint256, uint256){
        return (P1Reward, P1Duration, P2Reward, P2Duration, P3Reward, P3Duration, P4Reward, P4Duration);
    }
    function setCheckKeysContractAddress(address KeysContract) public onlyRole(ADMIN){
        __checkKeys = KeysContract;
        ERC721KeyCards = NFTContractFunctions(__checkKeys);
    }
    function setClaimContract(address ClaimContract) public onlyRole(ADMIN){
        _claimContract = ClaimContract;
    }
    function setmaxAllowancePerKey(uint256 _maxAllowancePerKey) public onlyRole(ADMIN){
        maxAllowancePerKey = _maxAllowancePerKey;
    }
    function getmaxAllowancePerKey() public view returns (uint256) {
        return maxAllowancePerKey;
    }
    function setMinWithdraw(uint256 _minWithdraw) public onlyRole(ADMIN){
        minWithdraw = _minWithdraw;
    } 
    function getminWithdraw() public view returns (uint256) {
        return minWithdraw;
    }
    function setminStakeValue(uint256 _minStakeValue) public onlyRole(ADMIN){
        minStakeValue = _minStakeValue;
    } 
    function setmaxStakeValue(uint256 _maxStakeValue) public onlyRole(ADMIN){
        maxStakeValue = _maxStakeValue;
    } 
    function getMinMaxValue() public view returns (uint256, uint256) {
        return (minStakeValue, maxStakeValue);
    }

    function pause() public whenNotPaused onlyRole(ADMIN){
        _pause();
    }
    function unPause() public whenPaused onlyRole(ADMIN){
        _unpause();
    }
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external pure returns (bytes4) {
        return this.onERC721Received.selector;
    }
    
}