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//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "./events.sol";

contract CoreHelpers is Events {
    using SafeERC20 for IERC20;

    /**
     * @dev Update storage.
     * @notice Internal function to update storage.
     */
    function updateStorage(uint256 exchangePrice_, uint256 newRevenue_)
        internal
    {
        if (exchangePrice_ > _lastRevenueExchangePrice) {
            _lastRevenueExchangePrice = exchangePrice_;
            _revenue += newRevenue_;
        }
    }

    /**
     * @dev Withdraw helper.
     */
    function withdrawHelper(uint256 amount_, uint256 limit_)
        internal
        pure
        returns (uint256, uint256)
    {
        uint256 transferAmt_;
        if (limit_ > amount_) {
            transferAmt_ = amount_;
            amount_ = 0;
        } else {
            transferAmt_ = limit_;
            amount_ = amount_ - limit_;
        }
        return (amount_, transferAmt_);
    }

    /**
     * @dev Withdraw final.
     */
    function withdrawFinal(uint256 amount_)
        internal
        view
        returns (uint256[] memory transferAmts_)
    {
        require(amount_ > 0, "amount-invalid");
        (
            uint256 tokenCollateralAmt_,
            ,
            ,
            uint256 tokenVaultBal_,
            uint256 tokenDSABal_,
            uint256 netTokenBal_
        ) = getVaultBalances();
        require(amount_ <= netTokenBal_, "excess-withdrawal");

        transferAmts_ = new uint256[](3);
        if (tokenVaultBal_ > 10) {
            (amount_, transferAmts_[0]) = withdrawHelper(
                amount_,
                tokenVaultBal_
            );
        }
        if (tokenDSABal_ > 10 && amount_ > 0) {
            (amount_, transferAmts_[1]) = withdrawHelper(amount_, tokenDSABal_);
        }
        if (tokenCollateralAmt_ > 10 && amount_ > 0) {
            (amount_, transferAmts_[2]) = withdrawHelper(
                amount_,
                tokenCollateralAmt_
            );
        }
    }

    /**
     * @dev Withdraw related transfers.
     */
    function withdrawTransfers(uint256 amount_, uint256[] memory transferAmts_)
        internal
    {
        if (transferAmts_[0] == amount_) return;
        uint256 totalTransferAmount_ = transferAmts_[0] +
            transferAmts_[1] +
            transferAmts_[2];
        require(amount_ == totalTransferAmount_, "transfers-not-valid");
        // batching up spells and withdrawing all the required asset from DSA to vault at once
        uint256 i;
        uint256 j;
        uint256 withdrawAmtDSA = transferAmts_[1] + transferAmts_[2];
        if (transferAmts_[2] > 0) j++;
        if (withdrawAmtDSA > 0) j++;
        string[] memory targets_ = new string[](j);
        bytes[] memory calldata_ = new bytes[](j);
        if (transferAmts_[2] > 0) {
            targets_[i] = "AAVE-V2-A";
            calldata_[i] = abi.encodeWithSignature(
                "withdraw(address,uint256,uint256,uint256)",
                address(_token),
                transferAmts_[2],
                0,
                0
            );
            i++;
        }
        if (withdrawAmtDSA > 0) {
            targets_[i] = "BASIC-A";
            calldata_[i] = abi.encodeWithSignature(
                "withdraw(address,uint256,address,uint256,uint256)",
                address(_token),
                withdrawAmtDSA,
                address(this),
                0,
                0
            );
        }
        _vaultDsa.cast(targets_, calldata_, address(this));
    }

    /**
     * @dev Internal function to handle withdrawals.
     */
    function withdrawInternal(
        uint256 amount_,
        address to_,
        bool afterDeleverage_
    ) internal returns (uint256 vtokenAmount_) {
        require(amount_ != 0, "amount cannot be zero");

        (
            uint256 exchangePrice_,
            uint256 newRevenue_
        ) = getCurrentExchangePrice();
        updateStorage(exchangePrice_, newRevenue_);

        if (amount_ == type(uint256).max) {
            vtokenAmount_ = balanceOf(msg.sender);
            amount_ = (vtokenAmount_ * exchangePrice_) / 1e18;
        } else {
            vtokenAmount_ = (amount_ * 1e18) / exchangePrice_;
        }

        _burn(msg.sender, vtokenAmount_);
        uint256 fee_ = (amount_ * _withdrawalFee) / 10000;
        uint256 amountAfterFee_ = amount_ - fee_;
        uint256[] memory transferAmts_ = withdrawFinal(amountAfterFee_);
        withdrawTransfers(amountAfterFee_, transferAmts_);

        (, , , , bool isOk_) = validateFinalPosition();
        require(isOk_, "position-risky");

        _token.safeTransfer(to_, amountAfterFee_);

        if (afterDeleverage_) {
            (, , , bool minGapIsOk_, ) = validateFinalPosition();
            require(minGapIsOk_, "excess-deleverage");
        }
    }

    /**
     * @dev Internal function for deleverage logics.
     */
    function deleverageInternal(uint256 amt_)
        internal
        returns (uint256 transferAmt_)
    {
        require(amt_ > 0, "not-valid-amount");
        wethContract.safeTransferFrom(msg.sender, address(_vaultDsa), amt_);

        bool isDsa_ = instaList.accountID(msg.sender) > 0;

        uint256 i;
        uint256 j = isDsa_ ? 2 : 3;
        string[] memory targets_ = new string[](j);
        bytes[] memory calldata_ = new bytes[](j);
        targets_[0] = "AAVE-V2-A";
        calldata_[0] = abi.encodeWithSignature(
            "payback(address,uint256,uint256,uint256,uint256)",
            address(wethContract),
            amt_,
            2,
            0,
            0
        );
        if (!isDsa_) {
            transferAmt_ = amt_ + ((amt_ * _deleverageFee) / 10000);
            targets_[1] = "AAVE-V2-A";
            calldata_[1] = abi.encodeWithSignature(
                "withdraw(address,uint256,uint256,uint256)",
                address(stethContract),
                transferAmt_,
                0,
                0
            );
            i = 2;
        } else {
            transferAmt_ = amt_;
            i = 1;
        }
        targets_[i] = "BASIC-A";
        calldata_[i] = abi.encodeWithSignature(
            "withdraw(address,uint256,address,uint256,uint256)",
            isDsa_ ? address(astethToken) : address(stethContract),
            transferAmt_,
            msg.sender,
            0,
            0
        );
        _vaultDsa.cast(targets_, calldata_, address(this));
    }
}

contract UserModule is CoreHelpers {
    using SafeERC20 for IERC20;

    /**
     * @dev User function to supply.
     * @param token_ address of token.
     * @param amount_ amount to supply.
     * @param to_ address to send vTokens to.
     * @return vtokenAmount_ amount of vTokens sent to the `to_` address passed
     */
    function supply(
        address token_,
        uint256 amount_,
        address to_
    ) external nonReentrant returns (uint256 vtokenAmount_) {
        require(token_ == address(_token), "wrong token");
        require(amount_ != 0, "amount cannot be zero");
        (
            uint256 exchangePrice_,
            uint256 newRevenue_
        ) = getCurrentExchangePrice();
        updateStorage(exchangePrice_, newRevenue_);
        _token.safeTransferFrom(msg.sender, address(this), amount_);
        vtokenAmount_ = (amount_ * 1e18) / exchangePrice_;
        _mint(to_, vtokenAmount_);
        emit supplyLog(amount_, msg.sender, to_);
    }

    /**
     * @dev User function to withdraw.
     * @param amount_ amount to withdraw.
     * @param to_ address to send tokens to.
     * @return vtokenAmount_ amount of vTokens burnt from caller
     */
    function withdraw(uint256 amount_, address to_)
        external
        nonReentrant
        returns (uint256 vtokenAmount_)
    {
        vtokenAmount_ = withdrawInternal(amount_, to_, false);
        emit withdrawLog(amount_, msg.sender, to_);
    }

    /**
     * @dev If ratio is below then this function will allow anyone to swap from steth -> weth.
     */
    function leverage(uint256 amt_) external nonReentrant {
        require(amt_ > 0, "not-valid-amount");
        stethContract.safeTransferFrom(msg.sender, address(_vaultDsa), amt_);
        uint256 fee_ = (amt_ * _swapFee) / 10000;
        uint256 transferAmt_ = amt_ - fee_;
        _revenueEth += fee_;

        uint256 tokenBal_ = _token.balanceOf(address(this));
        if (tokenBal_ > _tokenMinLimit)
            _token.safeTransfer(address(_vaultDsa), tokenBal_);
        tokenBal_ = _token.balanceOf(address(_vaultDsa));
        uint256 i;
        uint256 j = tokenBal_ > _tokenMinLimit ? 4 : 3;
        string[] memory targets_ = new string[](j);
        bytes[] memory calldata_ = new bytes[](j);
        if (tokenBal_ > _tokenMinLimit) {
            targets_[i] = "AAVE-V2-A";
            calldata_[i] = abi.encodeWithSignature(
                "deposit(address,uint256,uint256,uint256)",
                address(_token),
                tokenBal_,
                0,
                0
            );
            i++;
        }
        targets_[i] = "AAVE-V2-A";
        calldata_[i] = abi.encodeWithSignature(
            "deposit(address,uint256,uint256,uint256)",
            address(stethContract),
            amt_,
            0,
            0
        );
        targets_[i + 1] = "AAVE-V2-A";
        calldata_[i + 1] = abi.encodeWithSignature(
            "borrow(address,uint256,uint256,uint256,uint256)",
            address(wethContract),
            amt_,
            2,
            0,
            0
        );
        targets_[i + 2] = "BASIC-A";
        calldata_[i + 2] = abi.encodeWithSignature(
            "withdraw(address,uint256,address,uint256,uint256)",
            address(wethContract),
            transferAmt_,
            msg.sender,
            0,
            0
        );
        _vaultDsa.cast(targets_, calldata_, address(this));
        (, , bool minIsOk_, , ) = validateFinalPosition();
        require(minIsOk_, "excess-leverage");

        emit leverageLog(amt_, transferAmt_);
    }

    /**
     * @dev If ratio is above then this function will allow anyone to payback WETH and withdraw astETH to msg.sender at 1:1 ratio.
     */
    function deleverage(uint256 amt_) external nonReentrant {
        uint256 transferAmt_ = deleverageInternal(amt_);
        (, , , bool minGapIsOk_, ) = validateFinalPosition();
        require(minGapIsOk_, "excess-deleverage");
        emit deleverageLog(amt_, transferAmt_);
    }

    /**
     * @dev Function to allow users to max withdraw
     */
    function deleverageAndWithdraw(
        uint256 deleverageAmt_,
        uint256 withdrawAmount_,
        address to_
    ) external nonReentrant {
        uint256 transferAmt_ = deleverageInternal(deleverageAmt_);
        uint256 vtokenAmt_ = withdrawInternal(withdrawAmount_, to_, true);

        emit deleverageAndWithdrawLog(
            deleverageAmt_,
            transferAmt_,
            vtokenAmt_,
            to_
        );
    }
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;
import "../common/helpers.sol";

contract Events is Helpers {
    event supplyLog(
        uint256 amount_,
        address indexed caller_,
        address indexed to_
    );

    event withdrawLog(
        uint256 amount_,
        address indexed caller_,
        address indexed to_
    );

    event leverageLog(uint256 amt_, uint256 transferAmt_);

    event deleverageLog(uint256 amt_, uint256 transferAmt_);

    event deleverageAndWithdrawLog(
        uint256 deleverageAmt_,
        uint256 transferAmt_,
        uint256 vtokenAmount_,
        address to_
    );
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "./variables.sol";

contract Helpers is Variables {
    /**
     * @dev reentrancy gaurd.
     */
    modifier nonReentrant() {
        require(_status != 2, "ReentrancyGuard: reentrant call");
        _status = 2;
        _;
        _status = 1;
    }

    /**
     * @dev Helper function to get current eth borrow rate on aave.
     */
    function getWethBorrowRate()
        internal
        view
        returns (uint256 wethBorrowRate_)
    {
        (, , , , wethBorrowRate_, , , , , ) = aaveProtocolDataProvider
            .getReserveData(address(wethContract));
    }

    /**
     * @dev Helper function to get current token collateral on aave.
     */
    function getTokenCollateralAmount()
        internal
        view
        returns (uint256 tokenAmount_)
    {
        tokenAmount_ = _atoken.balanceOf(address(_vaultDsa));
    }

    /**
     * @dev Helper function to get current steth collateral on aave.
     */
    function getStethCollateralAmount()
        internal
        view
        returns (uint256 stEthAmount_)
    {
        stEthAmount_ = astethToken.balanceOf(address(_vaultDsa));
    }

    /**
     * @dev Helper function to get current eth debt on aave.
     */
    function getWethDebtAmount()
        internal
        view
        returns (uint256 wethDebtAmount_)
    {
        wethDebtAmount_ = awethVariableDebtToken.balanceOf(address(_vaultDsa));
    }

    /**
     * @dev Helper function to token balances of everywhere.
     */
    function getVaultBalances()
        public
        view
        returns (
            uint256 tokenCollateralAmt_,
            uint256 stethCollateralAmt_,
            uint256 wethDebtAmt_,
            uint256 tokenVaultBal_,
            uint256 tokenDSABal_,
            uint256 netTokenBal_
        )
    {
        tokenCollateralAmt_ = getTokenCollateralAmount();
        stethCollateralAmt_ = getStethCollateralAmount();
        wethDebtAmt_ = getWethDebtAmount();
        tokenVaultBal_ = _token.balanceOf(address(this));
        tokenDSABal_ = _token.balanceOf(address(_vaultDsa));
        netTokenBal_ = tokenCollateralAmt_ + tokenVaultBal_ + tokenDSABal_;
    }

    // returns net eth. net stETH + ETH - net ETH debt.
    function getNewProfits() public view returns (uint256 profits_) {
        uint256 stEthCol_ = getStethCollateralAmount();
        uint256 stEthDsaBal_ = stethContract.balanceOf(address(_vaultDsa));
        uint256 wethDsaBal_ = wethContract.balanceOf(address(_vaultDsa));
        uint256 positiveEth_ = stEthCol_ + stEthDsaBal_ + wethDsaBal_;
        uint256 negativeEth_ = getWethDebtAmount() + _revenueEth;
        profits_ = negativeEth_ < positiveEth_
            ? positiveEth_ - negativeEth_
            : 0;
    }

    /**
     * @dev Helper function to get current exchange price and new revenue generated.
     */
    function getCurrentExchangePrice()
        public
        view
        returns (uint256 exchangePrice_, uint256 newTokenRevenue_)
    {
        // net token balance is total balance. stETH collateral & ETH debt cancels out each other.
        (, , , , , uint256 netTokenBalance_) = getVaultBalances();
        netTokenBalance_ -= _revenue;
        uint256 totalSupply_ = totalSupply();
        uint256 exchangePriceWithRevenue_;
        if (totalSupply_ != 0) {
            exchangePriceWithRevenue_ =
                (netTokenBalance_ * 1e18) /
                totalSupply_;
        } else {
            exchangePriceWithRevenue_ = 1e18;
        }
        // Only calculate revenue if there's a profit
        if (exchangePriceWithRevenue_ > _lastRevenueExchangePrice) {
            uint256 newProfit_ = netTokenBalance_ -
                ((_lastRevenueExchangePrice * totalSupply_) / 1e18);
            newTokenRevenue_ = (newProfit_ * _revenueFee) / 10000;
            exchangePrice_ =
                ((netTokenBalance_ - newTokenRevenue_) * 1e18) /
                totalSupply_;
        } else {
            exchangePrice_ = exchangePriceWithRevenue_;
        }
    }

    struct ValidateFinalPosition {
        uint256 tokenPriceInBaseCurrency;
        uint256 ethPriceInBaseCurrency;
        uint256 excessDebtInBaseCurrency;
        uint256 netTokenColInBaseCurrency;
        uint256 netTokenSupplyInBaseCurrency;
        uint256 ratioMax;
        uint256 ratioMin;
    }

    /**
     * @dev Helper function to validate the safety of aave position after rebalancing.
     */
    function validateFinalPosition()
        internal
        view
        returns (
            bool criticalIsOk_,
            bool criticalGapIsOk_,
            bool minIsOk_,
            bool minGapIsOk_,
            bool withdrawIsOk_
        )
    {
        (
            uint256 tokenColAmt_,
            uint256 stethColAmt_,
            uint256 wethDebt_,
            ,
            ,
            uint256 netTokenBal_
        ) = getVaultBalances();

        uint256 ethCoveringDebt_ = (stethColAmt_ * _ratios.stEthLimit) / 10000;

        uint256 excessDebt_ = ethCoveringDebt_ < wethDebt_
            ? wethDebt_ - ethCoveringDebt_
            : 0;

        if (excessDebt_ > 0) {
            IAavePriceOracle aaveOracle_ = IAavePriceOracle(
                aaveAddressProvider.getPriceOracle()
            );

            ValidateFinalPosition memory validateFinalPosition_;
            validateFinalPosition_.tokenPriceInBaseCurrency = aaveOracle_
                .getAssetPrice(address(_token));
            validateFinalPosition_.ethPriceInBaseCurrency = aaveOracle_
                .getAssetPrice(address(wethContract));

            validateFinalPosition_.excessDebtInBaseCurrency =
                (excessDebt_ * validateFinalPosition_.ethPriceInBaseCurrency) /
                1e18;

            validateFinalPosition_.netTokenColInBaseCurrency =
                (tokenColAmt_ *
                    validateFinalPosition_.tokenPriceInBaseCurrency) /
                (10**_tokenDecimals);
            validateFinalPosition_.netTokenSupplyInBaseCurrency =
                (netTokenBal_ *
                    validateFinalPosition_.tokenPriceInBaseCurrency) /
                (10**_tokenDecimals);

            validateFinalPosition_.ratioMax =
                (validateFinalPosition_.excessDebtInBaseCurrency * 10000) /
                validateFinalPosition_.netTokenColInBaseCurrency;
            validateFinalPosition_.ratioMin =
                (validateFinalPosition_.excessDebtInBaseCurrency * 10000) /
                validateFinalPosition_.netTokenSupplyInBaseCurrency;

            criticalIsOk_ = validateFinalPosition_.ratioMax < _ratios.maxLimit;
            criticalGapIsOk_ =
                validateFinalPosition_.ratioMax > _ratios.maxLimitGap;
            minIsOk_ = validateFinalPosition_.ratioMin < _ratios.minLimit;
            minGapIsOk_ = validateFinalPosition_.ratioMin > _ratios.minLimitGap;
            withdrawIsOk_ =
                validateFinalPosition_.ratioMax < (_ratios.maxLimit - 100);
        } else {
            criticalIsOk_ = true;
            minIsOk_ = true;
        }
    }

    /**
     * @dev Helper function to validate if the leverage amount is divided correctly amount other-vault-swaps and 1inch-swap .
     */
    function validateLeverageAmt(
        address[] memory vaults_,
        uint256[] memory amts_,
        uint256 leverageAmt_,
        uint256 swapAmt_
    ) internal pure returns (bool isOk_) {
        if (leverageAmt_ == 0 && swapAmt_ == 0) {
            isOk_ = true;
            return isOk_;
        }
        uint256 l_ = vaults_.length;
        isOk_ = l_ == amts_.length;
        if (isOk_) {
            uint256 totalAmt_ = swapAmt_;
            for (uint256 i = 0; i < l_; i++) {
                totalAmt_ = totalAmt_ + amts_[i];
            }
            isOk_ = totalAmt_ <= leverageAmt_; // total amount should not be more than leverage amount
            isOk_ = isOk_ && ((leverageAmt_ * 9999) / 10000) < totalAmt_; // total amount should be more than (0.9999 * leverage amount). 0.01% slippage gap.
        }
    }
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "./interfaces.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {ERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";

contract ConstantVariables is ERC20Upgradeable {
    IInstaIndex internal constant instaIndex =
        IInstaIndex(0x2971AdFa57b20E5a416aE5a708A8655A9c74f723);
    IERC20 internal constant wethContract =
        IERC20(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
    IERC20 internal constant stethContract =
        IERC20(0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84);
    IAaveProtocolDataProvider internal constant aaveProtocolDataProvider =
        IAaveProtocolDataProvider(0x057835Ad21a177dbdd3090bB1CAE03EaCF78Fc6d);
    IAaveAddressProvider internal constant aaveAddressProvider =
        IAaveAddressProvider(0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5);
    IERC20 internal constant awethVariableDebtToken =
        IERC20(0xF63B34710400CAd3e044cFfDcAb00a0f32E33eCf);
    IERC20 internal constant astethToken =
        IERC20(0x1982b2F5814301d4e9a8b0201555376e62F82428);
    IInstaList internal constant instaList =
        IInstaList(0x4c8a1BEb8a87765788946D6B19C6C6355194AbEb);
}

contract Variables is ConstantVariables {
    uint256 internal _status = 1;

    // only authorized addresses can rebalance
    mapping(address => bool) internal _isRebalancer;

    IERC20 internal _token;

    uint8 internal _tokenDecimals;

    uint256 internal _tokenMinLimit;

    IERC20 internal _atoken;

    IDSA internal _vaultDsa;

    struct Ratios {
        uint16 maxLimit; // Above this withdrawals are not allowed
        uint16 maxLimitGap;
        uint16 minLimit; // After leverage the ratio should be below minLimit & above minLimitGap
        uint16 minLimitGap;
        uint16 stEthLimit; // if 7500. Meaning stETH collateral covers 75% of the ETH debt. Excess ETH will be covered by token limit.
        // send borrow rate in 4 decimals from UI. In the smart contract it'll convert to 27 decimals which where is 100%
        uint128 maxBorrowRate; // maximum borrow rate above this leveraging should not happen
    }

    Ratios internal _ratios;

    // last revenue exchange price (helps in calculating revenue)
    // Exchange price when revenue got updated last. It'll only increase overtime.
    uint256 internal _lastRevenueExchangePrice;

    uint256 internal _revenueFee; // 1000 = 10% (10% of user's profit)

    uint256 internal _revenue;

    uint256 internal _revenueEth;

    uint256 internal _withdrawalFee; // 10000 = 100%

    uint256 internal _idealExcessAmt; // 10 means 0.1% of total stEth/Eth supply (collateral + ideal balance)

    uint256 internal _swapFee; // 5 means 0.05%. This is the fee on leverage function which allows swap of stETH -> ETH

    uint256 internal _saveSlippage; // 1e16 means 1%

    uint256 internal _deleverageFee; // 1 means 0.01%
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IInstaIndex {
    function build(
        address owner_,
        uint256 accountVersion_,
        address origin_
    ) external returns (address account_);
}

interface IDSA {
    function cast(
        string[] calldata _targetNames,
        bytes[] calldata _datas,
        address _origin
    ) external payable returns (bytes32);
}

interface IAaveProtocolDataProvider {
    function getReserveData(address asset)
        external
        view
        returns (
            uint256 availableLiquidity,
            uint256 totalStableDebt,
            uint256 totalVariableDebt,
            uint256 liquidityRate,
            uint256 variableBorrowRate,
            uint256 stableBorrowRate,
            uint256 averageStableBorrowRate,
            uint256 liquidityIndex,
            uint256 variableBorrowIndex,
            uint40 lastUpdateTimestamp
        );
}

interface IAaveAddressProvider {
    function getPriceOracle() external view returns (address);
}

interface IAavePriceOracle {
    function getAssetPrice(address _asset) external view returns (uint256);
}

interface TokenInterface {
    function approve(address, uint256) external;

    function transfer(address, uint256) external;

    function transferFrom(
        address,
        address,
        uint256
    ) external;

    function deposit() external payable;

    function withdraw(uint256) external;

    function balanceOf(address) external view returns (uint256);

    function decimals() external view returns (uint256);

    function totalSupply() external view returns (uint256);
}

interface IInstaList {
    function accountID(address) external view returns (uint64);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.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 ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    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.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _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, _allowances[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 = _allowances[owner][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, 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:
     *
     * - `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;
        }
        _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;
        _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 Spend `amount` form the allowance of `owner` toward `spender`.
     *
     * 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 {}

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `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);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.0;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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e":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token_","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"},{"internalType":"address","name":"to_","type":"address"}],"name":"supply","outputs":[{"internalType":"uint256","name":"vtokenAmount_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount_","type":"uint256"},{"internalType":"address","name":"to_","type":"address"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"vtokenAmount_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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