// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IBEP20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external view returns (address);

    /**
     * @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
    );
}

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;
        }
    }
}

contract Renq_Staking {
    using SafeMath for uint256;

    struct depositStatus {
        uint256 amount_in;
        uint256 start_date;
        uint256 reward_date;
        bool deleted;
        uint256 pool;
    }
    struct referralStatus {
        uint256 amount_in;
        address ref_address;
    }
    struct userInfo {
        depositStatus[] deposits;
        referralStatus[] refs;
        uint256[6] total_deposit;
        uint256 total_ref;
    }

    mapping(address => userInfo) users;

    IBEP20 public _token;
    bool public referralStatusBool = false;
    bool public stakeUnstakeFeeBool = false;

    address public owner;
    mapping(uint256 => uint256) public totalDepositPerPool;
    uint256 private owner_fee = 2000000000000;
    uint256 private early_fee = 20000000000000;
    uint256 public early_record;
    uint256 private max_percent = 20000000000000;
    uint256[6] private minute_percent = [
        22831050,
        38051750,
        47564687,
        57077625,
        142694063,
        285388127
    ];

    uint256[6] private pools = [
        1 days,
        7 days,
        14 days,
        30 days,
        180 days,
        365 days
    ];
    uint256 private ref_percent = 2000000000000;
    uint256 private percent = 100000000000000;

    modifier onlyOwner() {
        require(msg.sender == owner, "Not owner");
        _;
    }

    modifier checkAllowance(uint256 amount) {
        require(
            _token.allowance(msg.sender, address(this)) >= amount,
            "Allowance Error"
        );
        _;
    }

    constructor(address token) {
        owner = 0x2D3C5979d582400708Eb1dc3Be24a06a7864c292;

        _token = IBEP20(token);
    }

    function userDeposit(
        address referral,
        uint256 _amount,
        uint256 _pool
    ) public checkAllowance(_amount) {
        // require(contractStarted(), "Contract not started yet.");
        require(_amount > 0, "Insufficinet value");
        _token.transferFrom(msg.sender, address(this), _amount);
        uint256 value = _amount;
        // send fee to owner
        if (stakeUnstakeFeeBool) {
            uint256 fee = value.mul(owner_fee).div(percent);
            _token.transfer(owner, fee);
            value = value - fee;
        }

        // save information
        depositStatus memory temp = depositStatus(
            value,
            block.timestamp,
            block.timestamp,
            false,
            _pool
        );
        users[msg.sender].deposits.push(temp);
        users[msg.sender].total_deposit[_pool] = users[msg.sender]
            .total_deposit[_pool]
            .add(value);

        totalDepositPerPool[_pool] = totalDepositPerPool[_pool].add(value);

        // // if user enter with referral link, save referral data
        if (referral != msg.sender && referralStatusBool) {
            value = _amount.mul(ref_percent).div(percent);
            referralStatus memory temp1 = referralStatus(value, msg.sender);
            users[referral].refs.push(temp1);
            users[referral].total_ref = users[referral].total_ref.add(value);
        }
    }

    function withdrawReward(uint256 _pool) public {
        uint256 total_amount = calcReward(msg.sender, _pool);
        uint256 balance = _token.balanceOf(address(this));
        require(balance >= total_amount, "Pool has not enough crypto");
        removeAfterReward(msg.sender, _pool);
        _token.transfer(msg.sender, total_amount);
    }

    function removeAfterReward(address to, uint256 _pool) internal {
        uint256 count = getUserDepositCount(to);
        userInfo storage user = users[to];
        uint256 current = block.timestamp;
        for (uint256 i = 0; i < count; i++) {
            depositStatus storage perStatus = users[to].deposits[i];
            uint256 poolx = perStatus.pool;

            if (poolx != _pool) {
                continue;
            }

            user.deposits[i].reward_date = current;
        }
    }

    function withdrawDeposit(uint256 amount, uint256 _pool) public {
        uint256 total_amount = calcWithdrawCall(msg.sender, _pool, amount);
        require(amount <= total_amount, "Invalid Input");
        require(
            _token.balanceOf(address(this)) >= amount,
            "Pool has not enough crypto"
        );
        withdrawReward(_pool);
        amount = total_amount;
        removeAfterWithdraw(msg.sender, amount, _pool);
        if (stakeUnstakeFeeBool) {
            uint256 fee = amount.mul(owner_fee).div(percent);
            _token.transfer(owner, fee);
            amount = amount - fee;
        }

        //  users[msg.sender].total_deposit[_pool] = users[msg.sender]
        //     .total_deposit[_pool]
        //     .sub(amount);

        // totalDepositPerPool[_pool] = totalDepositPerPool[_pool].sub(amount);

        _token.transfer(msg.sender, amount);
    }

    function withdrawToken(address to, uint256 amount) external onlyOwner {
        uint256 balance = _token.balanceOf(address(this));
        if (amount > balance) {
            _token.transfer(to, balance);
        } else {
            _token.transfer(to, amount);
        }
    }

    function depositToken(uint256 amount) external onlyOwner {
        require(amount > 0, "you can deposit more than 0 snt");
        uint256 balance = _token.balanceOf(msg.sender);
        uint256 allowance = _token.allowance(msg.sender, address(this));

        require(
            balance >= amount && allowance >= amount,
            "Insufficient balance or allowance"
        );

        _token.transferFrom(msg.sender, address(this), amount);
    }

    function removeAfterWithdraw(
        address to,
        uint256 amount,
        uint256 _pool
    ) internal {
        uint256 count = getUserDepositCount(to);
        uint256 tamt = amount;

        for (uint256 i = 0; i < count; i++) {
            depositStatus storage perStatus = users[to].deposits[i];

            if (perStatus.deleted == true || perStatus.pool != _pool) {
                continue;
            } else if (perStatus.amount_in <= tamt) {
                tamt = tamt.sub(perStatus.amount_in);
                delete users[to].deposits[i];
                users[to].deposits[i].deleted = true;

                // i = i.sub(1);
                // count = count.sub(1);
            } else {
                users[to].deposits[i].amount_in = users[to]
                    .deposits[i]
                    .amount_in
                    .sub(tamt);
                users[to].deposits[i].start_date = block.timestamp;

                break;
            }
        }
    }

    function withdrawReferral() public {
        userInfo storage user = users[msg.sender];
        require(
            referralStatusBool == true,
            "Referral system is currently unavailable"
        );
        require(
            _token.balanceOf(address(this)) >= user.total_ref,
            "Pool has not enough crypto"
        );
        _token.transfer(msg.sender, user.total_ref);
        users[msg.sender].total_ref = 0;
    }

    function calcWithdrawCall(
        address to,
        uint256 _pool,
        uint256 _amount
    ) internal returns (uint256) {
        uint256 value = 0;
        uint256 count = getUserDepositCount(to);
        uint256 current = block.timestamp;
        userInfo storage user = users[to];

        // uint256 tamt = _amount.mul(early_fee).div(percent);
        // early_record += tamt;
        for (uint256 i = 0; i < count; i++) {
            depositStatus storage perStatus = user.deposits[i];

            uint256 stakeTime = current - perStatus.start_date;
            uint256 eachReward = perStatus.amount_in;
            uint256 poolx = perStatus.pool;

            if (poolx == _pool) {
                totalDepositPerPool[_pool] -= perStatus.amount_in;
                if (stakeTime < pools[poolx]) {
                    early_record += perStatus.amount_in.mul(early_fee).div(
                        percent
                    );

                    eachReward =
                        eachReward -
                        eachReward.mul(early_fee).div(percent);

                    user.deposits[i].amount_in =
                        perStatus.amount_in -
                        perStatus.amount_in.mul(early_fee).div(percent);
                }

                value = value.add(eachReward);
            }
        }
        return value;
    }

    function calcWithdraw(
        address to,
        uint256 _pool,
        bool _bool
    ) public view returns (uint256) {
        uint256 value = 0;
        uint256 count = getUserDepositCount(to);
        uint256 current = block.timestamp;
        userInfo storage user = users[to];
        for (uint256 i = 0; i < count; i++) {
            depositStatus storage perStatus = user.deposits[i];
            uint256 stakeTime = current - perStatus.start_date;
            uint256 eachReward = perStatus.amount_in;
            uint256 poolx = perStatus.pool;

            if (poolx == _pool) {
                if (stakeTime < pools[perStatus.pool] && _bool) {
                    eachReward =
                        eachReward -
                        eachReward.mul(early_fee).div(percent);
                }

                value = value.add(eachReward);
            }
        }
        return value;
    }

    function calcReward(
        address to,
        uint256 _pool
    ) public view returns (uint256) {
        uint256 value = 0;
        uint256 current = block.timestamp;
        uint256 count = getUserDepositCount(to);
        userInfo storage user = users[to];

        for (uint256 i = 0; i < count; i++) {
            depositStatus storage perStatus = user.deposits[i];
            uint256 eachReward = perStatus.amount_in;
            uint256 stakeTime = current - perStatus.start_date;
            uint256 period = (current - perStatus.reward_date).div(1 minutes);
            uint256 stakePlan = perStatus.pool;

            if (stakePlan != _pool) {
                continue;
            }

            if (stakeTime <= 1 days && stakePlan == 0) {
                eachReward = eachReward.mul(period).mul(minute_percent[0]).div(
                    percent
                );
            } else if (stakeTime <= 7 days && stakePlan == 1) {
                eachReward = eachReward.mul(period).mul(minute_percent[1]).div(
                    percent
                );
            } else if (stakeTime <= 14 days && stakePlan == 2) {
                eachReward = eachReward.mul(period).mul(minute_percent[2]).div(
                    percent
                );
            } else if (stakeTime <= 30 days && stakePlan == 3) {
                eachReward = eachReward.mul(period).mul(minute_percent[3]).div(
                    percent
                );
            } else if (stakeTime <= 180 days && stakePlan == 4) {
                eachReward = eachReward.mul(period).mul(minute_percent[4]).div(
                    percent
                );
            } else if (stakeTime <= 365 days && stakePlan == 5) {
                eachReward = eachReward.mul(period).mul(minute_percent[5]).div(
                    percent
                );
            } else {
                eachReward = eachReward.mul(period).mul(minute_percent[0]).div(
                    percent
                );
            }

            value = value.add(eachReward);
        }
        return value;
    }

    function getUserDepositCount(address to) public view returns (uint256) {
        userInfo storage user = users[to];
        return user.deposits.length;
    }

    function getUserReferralCount(address to) public view returns (uint256) {
        userInfo storage user = users[to];
        return user.refs.length;
    }

    function getUserDeposit(
        uint256 index
    ) public view returns (uint256, uint256) {
        userInfo storage user = users[msg.sender];
        depositStatus storage userCurrent = user.deposits[index];
        return (userCurrent.amount_in, userCurrent.start_date);
    }

    function getTotalReferral(address to) public view returns (uint256) {
        userInfo storage user = users[to];
        return user.total_ref;
    }

    function getTotalDeposit(uint256 _pool) public view returns (uint256) {
        return totalDepositPerPool[_pool];
    }

    function getUserTotalDeposit(
        address to,
        uint256 _pool
    ) public view returns (uint256) {
        userInfo storage user = users[to];
        return user.total_deposit[_pool];
    }

    function getFreeTime(
        address to,
        uint256 _pool
    ) public view returns (uint256) {
        uint256 count = getUserDepositCount(to);
        userInfo storage user = users[to];
        uint256 i = count - 1;
        uint256 time = 0;
        while (i >= 0) {
            depositStatus storage perStatus = user.deposits[i];
            if (perStatus.pool == _pool) {
                time += perStatus.start_date + pools[perStatus.pool];
                break;
            }
            i--;
        }

        return time;
    }

    function checkFeePercent(uint256 fee) internal view returns (bool) {
        return fee <= max_percent;
    }

    function setOwnerFee(uint256 fee, uint256 _early_fee) public onlyOwner {
        require(checkFeePercent(fee), "you cant set it more than 5%");
        owner_fee = fee;
        early_fee = _early_fee;
    }

    function setOwner(address to) public onlyOwner {
        owner = to;
    }

    function adminClaimEarlyFees() public onlyOwner {
        _token.transfer(owner, early_record);
        early_record = 0;
    }

    function setRefFee(uint256 fee) public onlyOwner {
        require(checkFeePercent(fee), "you cant set it more than 5%");
        ref_percent = fee;
    }

    function setMinuteFee(uint256[6] memory fee) public onlyOwner {
        // require(checkFeePercent(fee), "you cant set it more than 5%");
        minute_percent = fee;
    }

    function setReferralStatus(bool _referralStatusBool) public onlyOwner {
        referralStatusBool = _referralStatusBool;
    }

    function setstakeUnstakeFeeBool(
        bool _stakeUnstakeFeeBool
    ) public onlyOwner {
        stakeUnstakeFeeBool = _stakeUnstakeFeeBool;
    }
}

// ██████╗░███████╗███╗░░██╗░██████╗░
// ██╔══██╗██╔════╝████╗░██║██╔═══██╗
// ██████╔╝█████╗░░██╔██╗██║██║██╗██║
// ██╔══██╗██╔══╝░░██║╚████║╚██████╔╝
// ██║░░██║███████╗██║░╚███║░╚═██╔═╝░
// ╚═╝░░╚═╝╚══════╝╚═╝░░╚══╝░░░╚═╝░░░

// Token: Renq Finance
// Website: https://renq.io
// Twitter: https://twitter.com/renqfinance
// Telegram: https://t.me/renqfinance

// SPDX-License-Identifier: MIT
// 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: @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/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @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/ERC20.sol


// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;




/**
 * @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.openzeppelin.com/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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _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;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - 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/token/ERC20/extensions/ERC20Burnable.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;



/**
 * @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 {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// File: RENQ.sol


pragma solidity ^0.8.15;




contract Renq is ERC20, ERC20Burnable, Ownable {
    constructor() ERC20("Renq Finance", "RENQ") {
        _mint(msg.sender, 1_000_000_000 ether);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override(ERC20) {
        super._beforeTokenTransfer(from, to, amount);
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual override(ERC20) {
        super._transfer(sender, recipient, amount);
    }
}