// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol


// OpenZeppelin Contracts (last updated v4.9.0) (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: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/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: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: JOK/Staking.sol



pragma solidity ^0.8.9;





interface IAffiliate {
    function changeUpline(address _addr, address _upline) external;

    function checkAffiliate(address _address) external view returns (uint256);
}

contract JokStaking is Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    IERC20 public token;

    address private affiliateAddress;
    address private teamWallet;

    uint256 public stakeFee = 40; //40%
    uint256 public buyBackFee = 40; //40%
    uint256 public devFee = 20; //20%

    uint256 public totalDeposits;
    uint256 public totalWithdrawn;
    uint256 public totalDepositors;
    uint256 public totalRewards;

    address[] public depositorsList;

    //will show weekly rewards
    uint256 private buyBackAmount;
    uint256 private teamAmount;

    uint256[4] public depositTier = [250_000_000_000, 1_000_000_000, 5_000_000_000, 15_000_000_000];//250M, 1B, 5B, 15B

    mapping(uint256 => uint256) public tierRewards;

    uint256 public freeTier = 50;//50%

    uint256 public denominator = 10000;

    bool public isPaused;

    struct Deposit {
        address depositor;
        uint256 amount;
        uint256 timestamp;
        bool withdrawn;
    }

    struct Depositor {
        uint256 totalDeposits;
        uint256 totalWithdrawn;
        uint256 totalDepositsCount;
        uint256 totalWithdrawnCount;
        uint256 totalRewards;
        uint256 claimableRewards;
    }

    mapping(address => Depositor) public depositors;
    mapping(address => Deposit[]) public deposits;
    mapping(address => bool) private operators;

    event Received(address, uint256);
    event Distributed(uint256, uint256, uint256, uint256, uint256);

    modifier onlyOperator() {
        require(operators[msg.sender], "Only bot operator can call this function");
        _;
    }

    constructor(address _affiliateAddress, address _token, address _teamWallet, address _operator) {
        affiliateAddress = _affiliateAddress;
        token = IERC20(_token);
        teamWallet = _teamWallet;
        operators[_operator] = true;
    }

    receive() external payable {}

    function deposit(uint256 _amount) external nonReentrant {
        require(!isPaused, "Contract is paused");
        require(_amount > 0, "Amount must be greater than 0");
        require(token.balanceOf(msg.sender) >= _amount, "Insufficient balance");
        require(token.allowance(msg.sender, address(this)) >= _amount, "Insufficient allowance");

        totalDeposits = totalDeposits.add(_amount);
        depositors[msg.sender].totalDeposits = depositors[msg.sender].totalDeposits.add(_amount);
        depositors[msg.sender].totalDepositsCount = depositors[msg.sender].totalDepositsCount.add(1);
        deposits[msg.sender].push(Deposit(msg.sender, _amount, block.timestamp, false));

        if (depositors[msg.sender].totalDepositsCount == 1) {
            totalDepositors = totalDepositors.add(1);
        }

        //add to depositors list
        if (depositorsList.length == 0) {
            depositorsList.push(msg.sender);
        } else {
            bool isExist = false;
            for (uint256 i = 0; i < depositorsList.length; i++) {
                if (depositorsList[i] == msg.sender) {
                    isExist = true;
                    break;
                }
            }
            if (!isExist) {
                depositorsList.push(msg.sender);
            }
        }

        require(
            token.transferFrom(msg.sender, address(this), _amount),
            "JOK token transfer failed"
        );
        emit Received(msg.sender, _amount);
    }

    function withdraw(uint256 _amount) external nonReentrant {
        require(!isPaused, "Contract is paused");
        require(_amount > 0, "Amount must be greater than 0");
        require(depositors[msg.sender].totalDeposits >= _amount, "Insufficient balance");

        totalWithdrawn = totalWithdrawn.add(_amount);
        depositors[msg.sender].totalWithdrawn = depositors[msg.sender].totalWithdrawn.add(_amount);
        depositors[msg.sender].totalWithdrawnCount = depositors[msg.sender].totalWithdrawnCount.add(1);
        depositors[msg.sender].claimableRewards = 0;

        if (depositors[msg.sender].totalDeposits == _amount) {
            totalDepositors = totalDepositors.sub(1);
        }

        //remove from depositors list
        if (depositors[msg.sender].totalDepositsCount == 1) {
            for (uint256 i = 0; i < depositorsList.length; i++) {
                if (depositorsList[i] == msg.sender) {
                    depositorsList[i] = depositorsList[depositorsList.length - 1];
                    depositorsList.pop();
                    break;
                }
            }
        }

        require(
            token.transfer(msg.sender, _amount),
            "JOK token transfer failed"
        );
        emit Received(msg.sender, _amount);
    }

    function claim() external nonReentrant {
        require(!isPaused, "Contract is paused");

        uint256 rewards = depositors[msg.sender].claimableRewards;

        if (rewards > 0) {
            totalRewards = totalRewards.add(rewards);
            depositors[msg.sender].claimableRewards = 0;
            depositors[msg.sender].totalRewards = depositors[msg.sender].totalRewards.add(rewards);

            payable(msg.sender).transfer(rewards);
            emit Received(msg.sender, rewards);
        }
    }

    function distributeRewards() external onlyOperator {
        uint256 ETHBalance = address(this).balance;
        uint amountForBuyBack = _calculateBuyBack(ETHBalance);
        uint amountForTeam = _calculateDevFee(ETHBalance);
        uint amountForStake = ETHBalance.sub(amountForBuyBack).sub(amountForTeam);

        for (uint i = 0; i < depositorsList.length; i++) {
            address depositor = depositorsList[i];

            uint256 userPercent = (totalDeposits * denominator) / depositors[depositor].totalDeposits;
            uint256 userRewards = (amountForStake * userPercent) / denominator;

            depositors[depositor].claimableRewards = depositors[depositor].claimableRewards.add(userRewards);
        }

        emit Distributed(block.timestamp, ETHBalance, amountForBuyBack, amountForTeam, amountForStake);
    }

    function _calculateBuyBack(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(buyBackFee).div(100);
    }

    function _calculateDevFee(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(devFee).div(100);
    }

    function getStakeTier(address _address) external view returns (uint256) {
        uint256 userDeposit = depositors[_address].totalDeposits;
        if (userDeposit >= depositTier[0] && userDeposit < depositTier[1]) {
            return tierRewards[depositTier[0]];
        } else if (userDeposit >= depositTier[1] && userDeposit < depositTier[2]) {
            return tierRewards[depositTier[1]];
        } else if (userDeposit >= depositTier[2] && userDeposit < depositTier[3]) {
            return tierRewards[depositTier[2]];
        } else if (userDeposit >= depositTier[3]) {
            return tierRewards[depositTier[3]];
        } else {
            return freeTier;
        }
    }
    //@_tier key of array , 0,1,2,3
    //@_amount amount of each tier
    function setDepositTier(uint256 _tier, uint256 _amount) external onlyOwner {
        depositTier[_tier] = _amount;
    }

    function setTierRewards(uint256 _amount, uint256 _percent) external onlyOwner {
        tierRewards[_amount] = _percent;
    }

    function setFees(uint256 _stakeFee, uint256 _buyBackFee, uint256 _devFee) external onlyOwner {
        stakeFee = _stakeFee;
        buyBackFee = _buyBackFee;
        devFee = _devFee;
    }

    function setPaused(bool _isPaused) external onlyOwner {
        isPaused = _isPaused;
    }

    function setAffiliateAddress(address _affiliateAddress) external onlyOwner {
        affiliateAddress = _affiliateAddress;
    }

    function setToken(address _token) external onlyOwner {
        token = IERC20(_token);
    }

    function setTeamWallet(address _teamWallet) external onlyOwner {
        teamWallet = _teamWallet;
    }

    function setOperator(address _operator, bool _status) external onlyOwner {
        operators[_operator] = _status;
    }

    function setFreeTier(uint256 _freeTier) external onlyOwner {
        freeTier = _freeTier;
    }

    function withdrawProfit(uint256 _amount) external onlyOperator {
        require(_amount <= address(this).balance, "Insufficient balance");
        payable(msg.sender).transfer(_amount);
    }

    function withdrawToken(uint256 _amount) external onlyOwner {
        require(_amount <= token.balanceOf(address(this)), "Insufficient balance");
        token.transfer(msg.sender, _amount);
    }
}