// File: /contracts/Gleaf.sol



// SPDX-License-Identifier: MIT
//Tes-Sal
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract GiraffeTower {
    function getGenesisAddresses() public view returns (address[] memory) {}

    function getGenesisAddress(uint256 token_id)
        public
        view
        returns (address)
    {}

    function walletOfOwner(address _owner)
        public
        view
        returns (uint256[] memory)
    {}

    struct Giraffe {
        uint256 birthday;
    }
    mapping(uint256 => Giraffe) public giraffes;
}

contract Gleaf is ERC20Burnable, Ownable {
    event LogNewAlert(string description, address indexed _from, uint256 _n);
    event NameChange(uint256 tokenId, string name);
    using SafeMath for uint256;
    address nullAddress = 0x0000000000000000000000000000000000000000;

    address public giraffetowerAddress = 0xb487A91382cD66076fc4C1AF4D7d8CE7f929A9bA;
    //Mapping of giraffe to timestamp
    mapping(uint256 => uint256) internal tokenIdToTimeStamp;
    mapping(uint256 => uint256) tokenRound;
    mapping(uint256 => string) giraffeName;
    uint256 public nameChangePrice = 10 ether;
    // Mapping if certain name string has already been reserved
    mapping(string => bool) private _nameReserved;
    uint256 public EMISSIONS_RATE = 11574070000000;
    uint256 public STAKED_EMISSIONS_RATE = 5787030000000;
    bool public CLAIM_STATUS = true;
    uint256 public CLAIM_START_TIME;
    uint256 totalDividends = 0;
    uint256 ownerRoyalty = 0;
    uint256 public OgsCount = 100;
    address pr = 0x044780Ef6d06BF528c03f423bF3D9d8a88837A3f;
    uint256 public MAX_TOKEN = 50;
    bool public STAKING_STATUS = true;
    uint256 public STAKE_CLAIM_START_TIME;
    uint256[] public stakedTokens;
     //Mapping of giraffe to timestamp
    mapping(uint256 => uint256) internal stakedTokenIdToTimeStamp;

    //Mapping of giraffe to staker
    mapping(uint256 => address) internal stakedTokenIdToStaker;

    //Mapping of staker to giraffe
    mapping(address => uint256[]) internal stakerToTokenIds;
    //Mapping of giraffeid to fee
    mapping(uint256 => uint256) public giraffeLendFee;

    event Received(address, uint256);

    constructor() ERC20("Gleaf", "GLEAF") {
        CLAIM_START_TIME = block.timestamp;
        STAKE_CLAIM_START_TIME = block.timestamp;
    }

    function getTokensStaked(address staker)
        public
        view
        returns (uint256[] memory)
    {
        return stakerToTokenIds[staker];
    }

    function getGiraffeLendFee(uint256 token_id)
        public
        view
        returns (uint256 )
    {
        return giraffeLendFee[token_id];
    }


    function remove(address staker, uint256 index) internal {
        if (index >= stakerToTokenIds[staker].length) return;

        for (uint256 i = index; i < stakerToTokenIds[staker].length - 1; i++) {
            stakerToTokenIds[staker][i] = stakerToTokenIds[staker][i + 1];
        }
        stakerToTokenIds[staker].pop();
    }

    function removeTokenIdFromStaker(address staker, uint256 tokenId) internal {
        for (uint256 i = 0; i < stakerToTokenIds[staker].length; i++) {
            if (stakerToTokenIds[staker][i] == tokenId) {
                //This is the tokenId to remove;
                remove(staker, i);
                giraffeLendFee[tokenId] = 0;
            }
        }
    }

    function stakeByIds(uint256[] memory tokenIds) public {
        require(STAKING_STATUS == true, "Staking Closed, try again later");
        require(
            tokenIds.length <= MAX_TOKEN,
            "Kindly Use the other function to unstake your giraffe!"
        );
        for (uint256 i = 0; i < tokenIds.length; i++) {
            require(
                IERC721(giraffetowerAddress).ownerOf(tokenIds[i]) == msg.sender &&
                    stakedTokenIdToStaker[tokenIds[i]] == nullAddress,
                "Token must be stakable by you!"
            );

            IERC721(giraffetowerAddress).transferFrom(
                msg.sender,
                address(this),
                tokenIds[i]
            );

            stakerToTokenIds[msg.sender].push(tokenIds[i]);

            stakedTokenIdToTimeStamp[tokenIds[i]] = block.timestamp;
            stakedTokenIdToStaker[tokenIds[i]] = msg.sender;
        }
    }

    function unstakeAll() public {
        require(
            stakerToTokenIds[msg.sender].length > 0,
            "Must have at least one token staked!"
        );
        require(
            stakerToTokenIds[msg.sender].length <= MAX_TOKEN,
            "Kindly Use the other function to unstake your giraffe!"
        );
        uint256 totalRewards = 0;

        for (uint256 i = stakerToTokenIds[msg.sender].length; i > 0; i--) {
            uint256 tokenId = stakerToTokenIds[msg.sender][i - 1];

            IERC721(giraffetowerAddress).transferFrom(
                address(this),
                msg.sender,
                tokenId
            );
            if(stakedTokenIdToTimeStamp[tokenId] < STAKE_CLAIM_START_TIME){
                stakedTokenIdToTimeStamp[tokenId] = STAKE_CLAIM_START_TIME;
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - stakedTokenIdToTimeStamp[tokenId]) *
                    STAKED_EMISSIONS_RATE);

            removeTokenIdFromStaker(msg.sender, tokenId);

            stakedTokenIdToStaker[tokenId] = nullAddress;
        }

        _mint(msg.sender, totalRewards);
    }

    function unstakeByIds(uint256[] memory tokenIds) public {
        uint256 totalRewards = 0;
        require(
            tokenIds.length <= MAX_TOKEN,
            "Only unstake 20 per txn!"
        );
        for (uint256 i = 0; i < tokenIds.length; i++) {
            require(
                stakedTokenIdToStaker[tokenIds[i]] == msg.sender,
                "Message Sender was not original staker!"
            );

            IERC721(giraffetowerAddress).transferFrom(
                address(this),
                msg.sender,
                tokenIds[i]
            );
            if(stakedTokenIdToTimeStamp[tokenIds[i]] < STAKE_CLAIM_START_TIME){
                stakedTokenIdToTimeStamp[tokenIds[i]] = STAKE_CLAIM_START_TIME;
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - stakedTokenIdToTimeStamp[tokenIds[i]]) *
                    STAKED_EMISSIONS_RATE);

            removeTokenIdFromStaker(msg.sender, tokenIds[i]);

            stakedTokenIdToStaker[tokenIds[i]] = nullAddress;
        }

        _mint(msg.sender, totalRewards);
    }

    function stakedclaimByTokenIds(uint256[] memory tokenIds) public {
        uint256 totalRewards = 0;
        require(
            tokenIds.length <= MAX_TOKEN,
            "Only claim 50 per txn!"
        );
        for (uint256 i = 0; i < tokenIds.length; i++) {
            if(stakedTokenIdToStaker[tokenIds[i]] != msg.sender){
                 require(
            IERC721(giraffetowerAddress).ownerOf(tokenIds[i]) == msg.sender,
            "Token is not claimable by you!"
        );
            }
        
         if(stakedTokenIdToTimeStamp[tokenIds[i]] < STAKE_CLAIM_START_TIME){
                stakedTokenIdToTimeStamp[tokenIds[i]] = STAKE_CLAIM_START_TIME;
            }

        totalRewards = totalRewards + ((block.timestamp - stakedTokenIdToTimeStamp[tokenIds[i]]) * STAKED_EMISSIONS_RATE);

        stakedTokenIdToTimeStamp[tokenIds[i]] = block.timestamp;
        }

        _mint(msg.sender, totalRewards);
    }

    function stakedClaimAll() public {
        // require(block.timestamp < CLAIM_END_TIME, "Claim period is over!");
        uint256[] memory tokenIds = stakerToTokenIds[msg.sender];
        uint256 totalRewards = 0;

        for (uint256 i = 0; i < tokenIds.length; i++) {
            require(
                stakedTokenIdToStaker[tokenIds[i]] == msg.sender,
                "Token is not claimable by you!"
            );
            if(stakedTokenIdToTimeStamp[tokenIds[i]] < STAKE_CLAIM_START_TIME){
                stakedTokenIdToTimeStamp[tokenIds[i]] = STAKE_CLAIM_START_TIME;
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - stakedTokenIdToTimeStamp[tokenIds[i]]) *
                    STAKED_EMISSIONS_RATE);

            stakedTokenIdToTimeStamp[tokenIds[i]] = block.timestamp;
        }

        _mint(msg.sender, totalRewards);
    }

    function stakedGetAllRewards(address staker) public view returns (uint256) {
        uint256[] memory tokenIds = stakerToTokenIds[staker];
        uint256 totalRewards = 0;

        for (uint256 i = 0; i < tokenIds.length; i++) {
            uint256 sct = stakedTokenIdToTimeStamp[tokenIds[i]];
            if(sct < STAKE_CLAIM_START_TIME){
               sct = STAKE_CLAIM_START_TIME;
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - sct) *
                    STAKED_EMISSIONS_RATE);
        }

        return totalRewards;
    }

    function stakedGetRewardsByTokenId(uint256 tokenId)
        public
        view
        returns (uint256)
    {
        require(
            stakedTokenIdToStaker[tokenId] != nullAddress,
            "Token is not staked!"
        );
        uint256 sct = stakedTokenIdToTimeStamp[tokenId];
        if(sct < STAKE_CLAIM_START_TIME){
               sct = STAKE_CLAIM_START_TIME;
            }
        uint256 secondsStaked = block.timestamp - sct;

        return secondsStaked * STAKED_EMISSIONS_RATE;
    }

    function getStaker(uint256 tokenId) public view returns (address) {
        return stakedTokenIdToStaker[tokenId];
    }

    function getPr() public view returns (address) {
        return pr;
    }

    function setGiraffetowerAddress(address _giraffetowerAddress)
        public
        onlyOwner
    {
        giraffetowerAddress = _giraffetowerAddress;
        return;
    }

    function setEmissionRate(uint256 _emissionrate) public onlyOwner {
        EMISSIONS_RATE = _emissionrate;
        return;
    }

    function setStakedEmissionRate(uint256 _emissionrate) public onlyOwner {
        STAKED_EMISSIONS_RATE = _emissionrate;
        STAKE_CLAIM_START_TIME = block.timestamp;
        return;
    }

    function setStakingStatus(bool _status) public onlyOwner {
        STAKING_STATUS = _status;
        return;
    }

    function setMaxToken(uint256 _maxtoken) public onlyOwner {
        MAX_TOKEN = _maxtoken;
        return;
    }

    function setGiraffeLendFee(uint256[] memory tokenIds, uint256[] memory fees) public {
         for (uint256 i = 0; i < tokenIds.length; i++) {
            require(
                stakedTokenIdToStaker[tokenIds[i]] == msg.sender,
                "You cannot set lending fee!"
            );
            giraffeLendFee[tokenIds[i]] = fees[i];
        }
        return;
    }

    function setGiraffeName(uint256 tokenId, string memory name) public {
        if(stakedTokenIdToStaker[tokenId] != msg.sender){
            require(
            IERC721(giraffetowerAddress).ownerOf(tokenId) == msg.sender,
            "Token is not nameable by you!"
        );
        }
        require(validateName(name) == true, "Not a valid new name");
        require(
            sha256(bytes(name)) != sha256(bytes(giraffeName[tokenId])),
            "New name is same as the current one"
        );
        require(isNameReserved(name) == false, "Name already reserved");
        if(stakedTokenIdToStaker[tokenId] != msg.sender){ //Allow Staked Users To change name for free
        uint256 allowance = allowance(msg.sender, pr);
        require(allowance >= nameChangePrice, "Check the token allowance");
        transferFrom(msg.sender, pr, nameChangePrice);
        }
        if (bytes(giraffeName[tokenId]).length > 0) {
            toggleReserveName(giraffeName[tokenId], false);
        }
        toggleReserveName(name, true);
        giraffeName[tokenId] = name;
        emit NameChange(tokenId, name);
    }

    function setPr(address _address) public onlyOwner{ 
        pr = _address;
    }

    /**
     * @dev Reserves the name if isReserve is set to true, de-reserves if set to false
     */
    function toggleReserveName(string memory str, bool isReserve) internal {
        _nameReserved[toLower(str)] = isReserve;
    }

    function isNameReserved(string memory nameString)
        public
        view
        returns (bool)
    {
        return _nameReserved[toLower(nameString)];
    }

    function validateName(string memory str) public pure returns (bool) {
        bytes memory b = bytes(str);
        if (b.length < 1) return false;
        if (b.length > 25) return false; // Cannot be longer than 25 characters
        if (b[0] == 0x20) return false; // Leading space
        if (b[b.length - 1] == 0x20) return false; // Trailing space

        bytes1 lastChar = b[0];

        for (uint256 i; i < b.length; i++) {
            bytes1 char = b[i];

            if (char == 0x20 && lastChar == 0x20) return false; // Cannot contain continous spaces

            if (
                !(char >= 0x30 && char <= 0x39) && //9-0
                !(char >= 0x41 && char <= 0x5A) && //A-Z
                !(char >= 0x61 && char <= 0x7A) && //a-z
                !(char == 0x20) //space
            ) return false;

            lastChar = char;
        }

        return true;
    }

    /**
     * @dev Converts the string to lowercase
     */
    function toLower(string memory str) public pure returns (string memory) {
        bytes memory bStr = bytes(str);
        bytes memory bLower = new bytes(bStr.length);
        for (uint256 i = 0; i < bStr.length; i++) {
            // Uppercase character
            if ((uint8(bStr[i]) >= 65) && (uint8(bStr[i]) <= 90)) {
                bLower[i] = bytes1(uint8(bStr[i]) + 32);
            } else {
                bLower[i] = bStr[i];
            }
        }
        return string(bLower);
    }

    function getGiraffeName(uint256 tokenId)
        public
        view
        returns (string memory)
    {
        return giraffeName[tokenId];
    }
    

    function changeNamePrice(uint256 _price) external onlyOwner {
		nameChangePrice = _price;
	}

    function setClaimStatus(bool _claimstatus) public onlyOwner {
        CLAIM_STATUS = _claimstatus;
        return;
    }

     function claimByTokenIds(uint256[] memory tokenIds) public {
        GiraffeTower gt = GiraffeTower(giraffetowerAddress);
        uint256 totalRewards = 0;
        require(
            tokenIds.length <= MAX_TOKEN,
            "Only claim 50 per txn!"
        );
        for (uint256 i = 0; i < tokenIds.length; i++) {
            if(stakedTokenIdToStaker[tokenIds[i]] != msg.sender){
                 require(
            IERC721(giraffetowerAddress).ownerOf(tokenIds[i]) == msg.sender,
            "Token is not claimable by you!"
        );
            }
         if (tokenIdToTimeStamp[tokenIds[i]] == 0) {
                uint256 birthday = gt.giraffes(tokenIds[i]);
                uint256 stime = 0;
                if (birthday > CLAIM_START_TIME) {
                    stime = birthday;
                } else {
                    stime = CLAIM_START_TIME;
                }
                if (gt.getGenesisAddress(tokenIds[i]) == msg.sender && birthday < CLAIM_START_TIME) {
                    totalRewards += (4320000 * EMISSIONS_RATE);
                }
                tokenIdToTimeStamp[tokenIds[i]] = stime;
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - tokenIdToTimeStamp[tokenIds[i]]) *
                    EMISSIONS_RATE);

            tokenIdToTimeStamp[tokenIds[i]] = block.timestamp;
        }

        _mint(msg.sender, totalRewards);
    }

    function claimAll() public {
        require(CLAIM_STATUS == true, "Claim disabled!");
        GiraffeTower gt = GiraffeTower(giraffetowerAddress);
        address _address = msg.sender;
        uint256[] memory tokenIds = gt.walletOfOwner(_address);
        uint256[] memory stokenIds = getTokensStaked(_address);
        uint256 totalRewards = 0;
        for (uint256 i = 0; i < tokenIds.length; i++) {

            if (tokenIdToTimeStamp[tokenIds[i]] == 0) {
                uint256 birthday = gt.giraffes(tokenIds[i]);
                uint256 stime = 0;
                if (birthday > CLAIM_START_TIME) {
                    stime = birthday;
                } else {
                    stime = CLAIM_START_TIME;
                }
                if (gt.getGenesisAddress(tokenIds[i]) == msg.sender && birthday < CLAIM_START_TIME) {
                    totalRewards = totalRewards + (4320000 * EMISSIONS_RATE);
                }
                tokenIdToTimeStamp[tokenIds[i]] = stime;
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - tokenIdToTimeStamp[tokenIds[i]]) *
                    EMISSIONS_RATE);

            tokenIdToTimeStamp[tokenIds[i]] = block.timestamp;
        }

        for (uint256 i = 0; i < stokenIds.length; i++) {

            if (tokenIdToTimeStamp[stokenIds[i]] == 0) {
                uint256 birthday = gt.giraffes(stokenIds[i]);
                uint256 stime = 0;
                if (birthday > CLAIM_START_TIME) {
                    stime = birthday;
                } else {
                    stime = CLAIM_START_TIME;
                }
                if (gt.getGenesisAddress(stokenIds[i]) == msg.sender && birthday < CLAIM_START_TIME) {
                    totalRewards = totalRewards + (4320000 * EMISSIONS_RATE);
                }
                tokenIdToTimeStamp[stokenIds[i]] = stime;
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - tokenIdToTimeStamp[stokenIds[i]]) *
                    EMISSIONS_RATE);

            tokenIdToTimeStamp[stokenIds[i]] = block.timestamp;
        }
        require(totalRewards > 0, "LTR!");
        _mint(msg.sender, totalRewards);
    }

    function getAllRewards(address _address) public view returns (uint256) {
        GiraffeTower gt = GiraffeTower(giraffetowerAddress);
        uint256[] memory tokenIds = gt.walletOfOwner(_address);
        uint256[] memory stokenIds = getTokensStaked(_address);

        uint256 totalRewards = 0;
        for (uint256 i = 0; i < tokenIds.length; i++) {
            if (tokenIdToTimeStamp[tokenIds[i]] == 0) {
                uint256 birthday = gt.giraffes(tokenIds[i]);
                uint256 stime = 0;
                if (birthday > CLAIM_START_TIME) {
                    stime = birthday;
                } else {
                    stime = CLAIM_START_TIME;
                }
                if (gt.getGenesisAddress(tokenIds[i]) == _address && birthday < CLAIM_START_TIME) {
                    totalRewards = totalRewards + (4320000 * EMISSIONS_RATE);
                }
                totalRewards =
                    totalRewards +
                    ((block.timestamp - stime) * EMISSIONS_RATE);
            } else {
                totalRewards =
                    totalRewards +
                    ((block.timestamp - tokenIdToTimeStamp[tokenIds[i]]) *
                        EMISSIONS_RATE);
            }
        }

        for (uint256 i = 0; i < stokenIds.length; i++) {
            if (tokenIdToTimeStamp[stokenIds[i]] == 0) {
                uint256 birthday = gt.giraffes(stokenIds[i]);
                uint256 stime = 0;
                if (birthday > CLAIM_START_TIME) {
                    stime = birthday;
                } else {
                    stime = CLAIM_START_TIME;
                }
                if (gt.getGenesisAddress(stokenIds[i]) == _address && birthday < CLAIM_START_TIME) {
                    totalRewards = totalRewards + (4320000 * EMISSIONS_RATE);
                }
                totalRewards =
                    totalRewards +
                    ((block.timestamp - stime) * EMISSIONS_RATE);
            } else {
                totalRewards =
                    totalRewards +
                    ((block.timestamp - tokenIdToTimeStamp[stokenIds[i]]) *
                        EMISSIONS_RATE);
            }
        }
        return totalRewards;
    }

    function getRewardsByTokenId(uint256 tokenId)
        public
        view
        returns (uint256)
    {
        GiraffeTower gt = GiraffeTower(giraffetowerAddress);
        uint256 birthday = gt.giraffes(tokenId);
        uint256 stime = 0;
        if (birthday > CLAIM_START_TIME) {
            stime = birthday;
        } else {
            stime = CLAIM_START_TIME;
        }
        uint256 totalRewards = 0;

        if (tokenIdToTimeStamp[tokenId] == 0) {
            if (gt.getGenesisAddress(tokenId) == msg.sender && birthday < CLAIM_START_TIME) {
                totalRewards = totalRewards + (4320000 * EMISSIONS_RATE);
            }
            totalRewards =
                totalRewards +
                ((block.timestamp - stime) * EMISSIONS_RATE);
        } else {
            totalRewards =
                totalRewards +
                ((block.timestamp - tokenIdToTimeStamp[tokenId]) *
                    EMISSIONS_RATE);
        }

        return totalRewards;
    }

    function getBirthday(uint256 tokenId) public view returns (uint256) {
        GiraffeTower gt = GiraffeTower(giraffetowerAddress);
        uint256 birthday = gt.giraffes(tokenId);

        return birthday;
    }

    function _ownerRoyalty() public view returns (uint256) {
        return ownerRoyalty;
    }

    receive() external payable {
        emit Received(msg.sender, msg.value);
        uint256 tt = msg.value / 5;
        totalDividends += tt;
        uint256 ot = msg.value - tt;
        ownerRoyalty += ot;
    }

    function withdrawReward(uint256 tokenId) external {
        if(stakedTokenIdToStaker[tokenId] != msg.sender){
        require(
            IERC721(giraffetowerAddress).ownerOf(tokenId) == msg.sender &&
                tokenId <= 100,
            "WR:Invalid"
        );
        }
        require(tokenId <= 100, "Invalid");
        uint256 total = (totalDividends - tokenRound[tokenId]) / OgsCount;
        require(total > 0, "Too Low");
        tokenRound[tokenId] = totalDividends;
        sendEth(msg.sender, total);
    }

    function withdrawAllReward() external {
        address _address = msg.sender;
        GiraffeTower gt = GiraffeTower(giraffetowerAddress);
        uint256[] memory _tokensOwned = gt.walletOfOwner(_address);
        uint256[] memory _stokensOwned = getTokensStaked(_address);
        uint256 totalClaim = 0;
        for (uint256 i; i < _tokensOwned.length; i++) {
            if (_tokensOwned[i] <= 100) {
                totalClaim +=
                    (totalDividends - tokenRound[_tokensOwned[i]]) /
                    OgsCount;
                tokenRound[_tokensOwned[i]] = totalDividends;
            }
        }
        for (uint256 i; i < _stokensOwned.length; i++) {
            if (_stokensOwned[i] <= 100) {
                totalClaim +=
                    (totalDividends - tokenRound[_stokensOwned[i]]) /
                    OgsCount;
                tokenRound[_stokensOwned[i]] = totalDividends;
            }
        }
        require(totalClaim > 0, "WAR: LTC");
        sendEth(msg.sender, totalClaim);
    }

    function withdrawRoyalty() external onlyOwner {
        require(ownerRoyalty > 0, "WRLTY:Invalid");
        uint256 total = ownerRoyalty;
        ownerRoyalty = 0;
        sendEth(msg.sender, total);
    }

    function rewardBalance(uint256 tokenId) public view returns (uint256) {
           require(tokenId < 100 , "RB:Invalid");
        uint256 total = (totalDividends - tokenRound[tokenId]) / OgsCount;
        return total;
    }

    function getAllReward(address _address) public view returns (uint256) {
        GiraffeTower gt = GiraffeTower(giraffetowerAddress);
        uint256[] memory _tokensOwned = gt.walletOfOwner(_address);
        uint256[] memory _stokensOwned = getTokensStaked(_address);
        uint256 totalClaim = 0;
        for (uint256 i; i < _tokensOwned.length; i++) {
            if (_tokensOwned[i] <= 100) {
                totalClaim +=
                    (totalDividends - tokenRound[_tokensOwned[i]]) /
                    OgsCount;
            }
        }
        for (uint256 i; i < _stokensOwned.length; i++) {
            if (_stokensOwned[i] <= 100) {
                totalClaim +=
                    (totalDividends - tokenRound[_stokensOwned[i]]) /
                    OgsCount;
            }
        }
        return totalClaim;
    }

    

    function withdrawFunds(uint256 amount) public onlyOwner {
        sendEth(msg.sender, amount);
    }

    function sendEth(address to, uint256 amount) internal {
        (bool success, ) = to.call{value: amount}("");
        require(success, "Failed to send ether");
    }

    function withdrawToken(
        IERC20 token,
        address recipient,
        uint256 amount
    ) public onlyOwner {
        require(
            token.balanceOf(address(this)) >= amount,
            "You do not have sufficient Balance"
        );
        token.transfer(recipient, amount);
    }
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol



// SPDX-License-Identifier: MIT

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 no longer needed starting with Solidity 0.8. 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 substraction 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/introspection/IERC165.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

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/token/ERC721/extensions/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

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);
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}