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// SPDX-License-Identifier: MIT AND AGPL-3.0-or-later

pragma solidity =0.8.9;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "../shared/ProtocolConstants.sol";

import "../interfaces/shared/IERC20Extended.sol";
import "../interfaces/tokens/IUSDV.sol";
import "../interfaces/tokens/validator/IUnlockValidator.sol";

contract USDV is IUSDV, ProtocolConstants, ERC20, Ownable {
    /* ========== LIBRARIES ========== */

    // Used for safe token transfers
    using SafeERC20 for IERC20Extended;

    /* ========== STATE VARIABLES ========== */

    // The VADER token used for burns and mints
    IERC20Extended public immutable vader;

    // All mint/burn locks
    mapping(address => Lock[]) public locks;

    // Guardian Account
    address public guardian;

    // Lock system
    bool public isLocked;

    // Minter contract
    address public minter;

    // Validator contract
    IUnlockValidator public validator;

    /* ========== CONSTRUCTOR ========== */

    constructor(IERC20Extended _vader) ERC20("Vader USD", "USDV") {
        require(
            _vader != IERC20Extended(_ZERO_ADDRESS),
            "USDV::constructor: Improper Configuration"
        );
        vader = _vader;
    }

    /* ========== VIEWS ========== */
    /*
     * @dev Returns number of locks for {account}
     *
     * @param account
     **/
    function getLockCount(address account) external view returns (uint256) {
        return locks[account].length;
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    /*
     * @dev Mints the amount given represented by the param {vAmount}.
     *
     * @param account is msg.sender.
     * @param exchangeFee is VaderMinterUpgradable.getPublicFee()
     * @returns amount of USDV minted.
     *
     * Requirements:
     * - Contract is not locked.
     * - Only minter contract can call this function.
     * - Param {vAmount} can not be zero.
     * - Param {uAmount} can not be zero.
     **/
    function mint(
        address account,
        uint256 vAmount,
        uint256 uAmount,
        uint256 exchangeFee,
        uint256 window
    ) external onlyWhenNotLocked onlyMinter returns (uint256) {
        require(
            vAmount != 0 && uAmount != 0,
            "USDV::mint: Zero Input / Output"
        );
        require(
            window <= _MAX_LOCK_DURATION,
            "USDV::mint: Window > max lock duration"
        );

        vader.transferFrom(account, address(this), vAmount);
        vader.burn(vAmount);

        if (exchangeFee != 0) {
            uint256 fee = (uAmount * exchangeFee) / _MAX_BASIS_POINTS;
            uAmount = uAmount - fee;
            _mint(owner(), fee);
        }

        _mint(address(this), uAmount);

        _createLock(LockTypes.USDV, uAmount, account, window);

        return uAmount;
    }

    /*
     * @dev Burns the amount given represented by the param {uAmount}.
     *
     * @param account is msg.sender.
     * @param exchangeFee is VaderMinterUpgradable.getPublicFee()
     * @returns amount of Vader minted.
     *
     * Requirements:
     * - Contract is not locked.
     * - Only minter contract can call this function.
     * - Param {uAmount} can not be zero.
     * - Param {vAmount} can not be zero.
     **/
    function burn(
        address account,
        uint256 uAmount,
        uint256 vAmount,
        uint256 exchangeFee,
        uint256 window
    ) external onlyWhenNotLocked onlyMinter returns (uint256) {
        require(
            uAmount != 0 && vAmount != 0,
            "USDV::burn: Zero Input / Output"
        );
        require(
            window <= _MAX_LOCK_DURATION,
            "USDV::burn: Window > max lock duration"
        );

        _burn(account, uAmount);

        if (exchangeFee != 0) {
            uint256 fee = (vAmount * exchangeFee) / _MAX_BASIS_POINTS;
            vAmount = vAmount - fee;
            vader.mint(owner(), fee);
        }

        vader.mint(address(this), vAmount);

        _createLock(LockTypes.VADER, vAmount, account, window);

        return vAmount;
    }

    /*
     * @dev Claim vested tokens for lock index {i}.
     *
     * Requirements:
     * - Contract is not locked.
     **/
    function claim(uint256 i) external onlyWhenNotLocked returns (uint256) {
        Lock[] storage userLocks = locks[msg.sender];
        Lock memory lock = userLocks[i];

        require(lock.release <= block.timestamp, "USDV::claim: Vesting");
        require(
            validator.isValid(msg.sender, lock.amount, lock.token),
            "USDV::claim: Prohibited Claim"
        );

        uint256 last = userLocks.length - 1;
        if (i != last) {
            userLocks[i] = userLocks[last];
        }

        userLocks.pop();

        if (lock.token == LockTypes.USDV)
            _transfer(address(this), msg.sender, lock.amount);
        else vader.transfer(msg.sender, lock.amount);

        emit LockClaimed(msg.sender, lock.token, lock.amount, lock.release);

        return lock.amount;
    }

    /*
     * @dev Claim all vested tokens.
     *
     * Requirements:
     * - Contract is not locked.
     **/
    function claimAll()
        external
        onlyWhenNotLocked
        returns (uint256 usdvAmount, uint256 vaderAmount)
    {
        Lock[] memory userLocks = locks[msg.sender];
        delete locks[msg.sender];

        for (uint256 i = 0; i < userLocks.length; i++) {
            Lock memory lock = userLocks[i];

            require(lock.release <= block.timestamp, "USDV::claimAll: Vesting");
            require(
                validator.isValid(msg.sender, lock.amount, lock.token),
                "USDV::claimAll: Prohibited Claim"
            );

            if (lock.token == LockTypes.USDV) {
                _transfer(address(this), msg.sender, lock.amount);
                usdvAmount += lock.amount;
            } else {
                vader.transfer(msg.sender, lock.amount);
                vaderAmount += lock.amount;
            }

            emit LockClaimed(msg.sender, lock.token, lock.amount, lock.release);
        }
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    /*
     * @dev Sets the validator implementation represented by the param {_validator}.
     *
     * Requirements:
     * - Only existing owner can call this function.
     * - Param {_validator} cannot be a zero address.
     **/
    function setValidator(IUnlockValidator _validator) external onlyOwner {
        require(
            _validator != IUnlockValidator(_ZERO_ADDRESS),
            "USDV::setValidator: Improper Configuration"
        );
        emit ValidatorSet(address(validator), address(_validator));
        validator = _validator;
    }

    /*
     * @dev Sets the guardian address represented by the param {_guardian}.
     *
     * Requirements:
     * - Only existing owner can call this function.
     * - Param {_guardian} cannot be a zero address.
     **/
    function setGuardian(address _guardian) external onlyOwner {
        require(_guardian != address(0), "USDV::setGuardian: Zero Address");
        emit GuardianSet(guardian, _guardian);
        guardian = _guardian;
    }

    /*
     * @dev Sets the lock mechanism status represented by the param {_lock}.
     *
     * Requirements:
     * - Only existing owner or guardian can call this function.
     **/
    function setLock(bool _lock) external {
        require(
            msg.sender == owner() || msg.sender == guardian,
            "USDV::setLock: Insufficient Privileges"
        );
        emit LockStatusSet(_lock);
        isLocked = _lock;
    }

    /*
     * @dev Sets the minter contract address represented by the param {_minter}.
     *
     * Requirements:
     * - Only existing owner can call this function.
     * - Param {_minter} cannot be a zero address.
     * - Minter is not already set.
     **/
    function setMinter(address _minter) external onlyOwner {
        require(_minter != address(0), "USDV::setMinter: Zero address");
        emit MinterSet(_minter);
        minter = _minter;
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    /* ========== PRIVATE FUNCTIONS ========== */

    /*
     * @dev Creates a lock by type with param {lockType} and amount with param {amount}.
     *
     **/
    function _createLock(
        LockTypes lockType,
        uint256 amount,
        address account,
        uint256 window
    ) private {
        if (window != 0) {
            uint256 release = block.timestamp + window;

            locks[account].push(Lock(lockType, amount, release));

            emit LockCreated(account, lockType, amount, release);
        } else if (lockType == LockTypes.USDV)
            _transfer(address(this), account, amount);
        else vader.transfer(account, amount);
    }

    /* ========== MODIFIERS ========== */
    modifier onlyWhenNotLocked() {
        require(!isLocked, "USDV::onlyWhenNotLocked: System is Locked");
        _;
    }

    modifier onlyMinter() {
        require(
            msg.sender == minter,
            "USDV::onlyMinter: Insufficient Privileges"
        );
        _;
    }
}

// SPDX-License-Identifier: MIT AND AGPL-3.0-or-later

pragma solidity =0.8.9;

abstract contract ProtocolConstants {
    /* ========== GENERAL ========== */

    // The zero address, utility
    address internal constant _ZERO_ADDRESS = address(0);

    // One year, utility
    uint256 internal constant _ONE_YEAR = 365 days;

    // Basis Points
    uint256 internal constant _MAX_BASIS_POINTS = 100_00;

    /* ========== VADER TOKEN ========== */

    // Max VADER supply
    uint256 internal constant _INITIAL_VADER_SUPPLY = 25_000_000_000 * 1 ether;

    // Allocation for VETH holders
    uint256 internal constant _VETH_ALLOCATION = 7_500_000_000 * 1 ether;

    // Team allocation vested over {VESTING_DURATION} years
    uint256 internal constant _TEAM_ALLOCATION = 2_500_000_000 * 1 ether;

    // Ecosystem growth fund unlocked for partnerships & USDV provision
    uint256 internal constant _ECOSYSTEM_GROWTH = 2_500_000_000 * 1 ether;

    // Total grant tokens
    uint256 internal constant _GRANT_ALLOCATION = 12_500_000_000 * 1 ether;

    // Emission Era
    uint256 internal constant _EMISSION_ERA = 24 hours;

    // Initial Emission Curve, 5
    uint256 internal constant _INITIAL_EMISSION_CURVE = 5;

    // Fee Basis Points
    uint256 internal constant _MAX_FEE_BASIS_POINTS = 1_00;

    /* ========== USDV TOKEN ========== */

    // Max locking duration
    uint256 internal constant _MAX_LOCK_DURATION = 30 days;

    /* ========== VESTING ========== */

    // Vesting Duration
    uint256 internal constant _VESTING_DURATION = 2 * _ONE_YEAR;

    /* ========== CONVERTER ========== */

    // Vader -> Vether Conversion Rate (10000:1)
    uint256 internal constant _VADER_VETHER_CONVERSION_RATE = 10_000;

    // Burn Address
    address internal constant _BURN =
        0xdeaDDeADDEaDdeaDdEAddEADDEAdDeadDEADDEaD;

    /* ========== GAS QUEUE ========== */

    // Address of Chainlink Fast Gas Price Oracle
    address internal constant _FAST_GAS_ORACLE =
        0x169E633A2D1E6c10dD91238Ba11c4A708dfEF37C;

    /* ========== VADER RESERVE ========== */

    // Minimum delay between grants
    uint256 internal constant _GRANT_DELAY = 30 days;

    // Maximum grant size divisor
    uint256 internal constant _MAX_GRANT_BASIS_POINTS = 10_00;
}

// SPDX-License-Identifier: MIT AND AGPL-3.0-or-later

pragma solidity =0.8.9;

import "../IUSDV.sol";

interface IUnlockValidator {
    function isValid(
        address user,
        uint256 amount,
        IUSDV.LockTypes lockType
    ) external view returns (bool);

    event Invalidate(address account);
    event Validate(address account);
}

// SPDX-License-Identifier: MIT AND AGPL-3.0-or-later

pragma solidity =0.8.9;

interface IUSDV {
    /* ========== ENUMS ========== */

    enum LockTypes {
        USDV,
        VADER
    }

    /* ========== STRUCTS ========== */

    struct Lock {
        LockTypes token;
        uint256 amount;
        uint256 release;
    }

    /* ========== FUNCTIONS ========== */

    function mint(
        address account,
        uint256 vAmount,
        uint256 uAmount,
        uint256 exchangeFee,
        uint256 window
    ) external returns (uint256);

    function burn(
        address account,
        uint256 uAmount,
        uint256 vAmount,
        uint256 exchangeFee,
        uint256 window
    ) external returns (uint256);

    /* ========== EVENTS ========== */

    event ExchangeFeeChanged(uint256 previousExchangeFee, uint256 exchangeFee);
    event DailyLimitChanged(uint256 previousDailyLimit, uint256 dailyLimit);
    event LockClaimed(
        address user,
        LockTypes lockType,
        uint256 lockAmount,
        uint256 lockRelease
    );
    event LockCreated(
        address user,
        LockTypes lockType,
        uint256 lockAmount,
        uint256 lockRelease
    );
    event ValidatorSet(address previous, address current);
    event GuardianSet(address previous, address current);
    event LockStatusSet(bool status);
    event MinterSet(address minter);
}

// SPDX-License-Identifier: MIT AND AGPL-3.0-or-later

pragma solidity =0.8.9;

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

interface IERC20Extended is IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function mint(address to, uint256 amount) external;

    function burn(uint256 amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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

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

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

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

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

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

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

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0000000000000000000000002602278ee1882889b946eb11dc0e810075650983

-----Decoded View---------------
Arg [0] : _vader (address): 0x2602278EE1882889B946eb11DC0E810075650983

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000002602278ee1882889b946eb11dc0e810075650983