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// SPDX-License-Identifier: MIT


pragma solidity 0.7.6;


import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./DVGToken.sol";


contract DAOstake is Ownable {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;


    /* 
    Basically, any point in time, the amount of DVGs entitled to a user but is pending to be distributed is:
    
    pending DVG = (user.lpAmount * pool.accDVGPerLP) - user.finishedDVG
    
    Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
    1. The pool's `accDVGPerLP` (and `lastRewardBlock`) gets updated.
    2. User receives the pending DVG sent to his/her address.
    3. User's `lpAmount` gets updated.
    4. User's `finishedDVG` gets updated.
    */
    struct Pool {
        // Address of LP token
        address lpTokenAddress;
        // Weight of pool           
        uint256 poolWeight;
        // Last block number that DVGs distribution occurs for pool
        uint256 lastRewardBlock; 
        // Accumulated DVGs per LP of pool
        uint256 accDVGPerLP; 
    }

    struct User {
        // LP token amount that user provided
        uint256 lpAmount;     
        // Finished distributed DVGs to user
        uint256 finishedDVG;
    }
    

    /* 
    END_BLOCK = START_BLOCK + BLOCK_PER_PERIOD * PERIOD_AMOUNT 
    */
    // First block that DAOstake will start from
    uint256 public constant START_BLOCK = 12770000;
    // First block that DAOstake will end from
    uint256 public constant END_BLOCK = 22234000;
    // Amount of block per period: 6500(blocks per day) * 14(14 days/2 weeks) = 91000
    uint256 public constant BLOCK_PER_PERIOD = 91000;
    // Amount of period
    uint256 public constant PERIOD_AMOUNT = 104;

    // Treasury wallet address
    address public treasuryWalletAddr;
    // Community wallet address
    address public communityWalletAddr;

    // DVG token 
    DVGToken public dvg;

    // Percent of DVG is distributed to treasury wallet per block: 24.5%
    uint256 public constant TREASURY_WALLET_PERCENT = 2450;
    // Percent of DVG is distributed to community wallet per block: 24.5%
    uint256 public constant COMMUNITY_WALLET_PERCENT = 2450;
    // Percent of DVG is distributed to pools per block: 51%
    uint256 public constant POOL_PERCENT = 5100;

    // Total pool weight / Sum of all pool weights
    uint256 public totalPoolWeight;
    Pool[] public pool;
    // pool id => user address => user info
    mapping (uint256 => mapping (address => User)) public user;

    // period id => DVG amount per block of period
    mapping (uint256 => uint256) public periodDVGPerBlock;


    event SetWalletAddress(address indexed treasuryWalletAddr, address indexed communityWalletAddr);

    event SetDVG(DVGToken indexed dvg);

    event TransferDVGOwnership(address indexed newOwner);

    event AddPool(address indexed lpTokenAddress, uint256 indexed poolWeight, uint256 indexed lastRewardBlock);

    event SetPoolWeight(uint256 indexed poolId, uint256 indexed poolWeight, uint256 totalPoolWeight);

    event UpdatePool(uint256 indexed poolId, uint256 indexed lastRewardBlock, uint256 totalDVG);

    event Deposit(address indexed user, uint256 indexed poolId, uint256 amount);

    event Withdraw(address indexed user, uint256 indexed poolId, uint256 amount);

    event EmergencyWithdraw(address indexed user, uint256 indexed poolId, uint256 amount);


    /**
     * @notice Update DVG amount per block for each period when deploying. Be careful of gas spending!
     */
    constructor(
        address _treasuryWalletAddr,
        address _communityWalletAddr,
        DVGToken _dvg
    ) {
        periodDVGPerBlock[1] = 30 ether;

        for (uint256 i = 2; i <= PERIOD_AMOUNT; i++) {
            periodDVGPerBlock[i] = periodDVGPerBlock[i.sub(1)].mul(9650).div(10000);
        }

        setWalletAddress(_treasuryWalletAddr, _communityWalletAddr);

        setDVG(_dvg);
    }


    /** 
     * @notice Set all params about wallet address. Can only be called by owner
     * Remember to mint and distribute pending DVGs to wallet before changing address
     *
     * @param _treasuryWalletAddr     Treasury wallet address
     * @param _communityWalletAddr    Community wallet address
     */
    function setWalletAddress(address _treasuryWalletAddr, address _communityWalletAddr) public onlyOwner {
        require((_treasuryWalletAddr != address(0)) && (_communityWalletAddr != address(0)), "Any wallet address should not be zero address");
        
        treasuryWalletAddr = _treasuryWalletAddr;
        communityWalletAddr = _communityWalletAddr;
    
        emit SetWalletAddress(treasuryWalletAddr, communityWalletAddr);
    }

    /**
     * @notice Set DVG token address. Can only be called by owner
     */
    function setDVG(DVGToken _dvg) public onlyOwner {
        dvg = _dvg;
    
        emit SetDVG(dvg);
    }

    /**
     * @notice Transfer ownership of DVG token. Can only be called by this smart contract owner
     *
     */
    function transferDVGOwnership(address _newOwner) public onlyOwner {
        dvg.transferOwnership(_newOwner);
        emit TransferDVGOwnership(_newOwner);
    }

    /** 
     * @notice Get the length/amount of pool
     */
    function poolLength() external view returns(uint256) {
        return pool.length;
    } 

    /** 
     * @notice Return reward multiplier over given _from to _to block. [_from, _to)
     * 
     * @param _from    From block number (included)
     * @param _to      To block number (exluded)
     */
    function getMultiplier(uint256 _from, uint256 _to) public view returns(uint256 multiplier) {
        if (_from < START_BLOCK) {_from = START_BLOCK;}
        if (_to > END_BLOCK) {_to = END_BLOCK;}

        uint256 periodOfFrom = _from.sub(START_BLOCK).div(BLOCK_PER_PERIOD).add(1);
        uint256 periodOfTo = _to.sub(START_BLOCK).div(BLOCK_PER_PERIOD).add(1);
        
        if (periodOfFrom == periodOfTo) {
            multiplier = _to.sub(_from).mul(periodDVGPerBlock[periodOfTo]);
        } else {
            uint256 multiplierOfFrom = BLOCK_PER_PERIOD.mul(periodOfFrom).add(START_BLOCK).sub(_from).mul(periodDVGPerBlock[periodOfFrom]);
            uint256 multiplierOfTo = _to.sub(START_BLOCK).mod(BLOCK_PER_PERIOD).mul(periodDVGPerBlock[periodOfTo]);
            multiplier = multiplierOfFrom.add(multiplierOfTo);
            for (uint256 periodId = periodOfFrom.add(1); periodId < periodOfTo; periodId++) {
                multiplier = multiplier.add(BLOCK_PER_PERIOD.mul(periodDVGPerBlock[periodId]));
            }
        }
    }

    /** 
     * @notice Get pending DVG amount of user in pool
     */
    function pendingDVG(uint256 _pid, address _user) external view returns(uint256) {
        Pool storage pool_ = pool[_pid];
        User storage user_ = user[_pid][_user];
        uint256 accDVGPerLP = pool_.accDVGPerLP;
        uint256 lpSupply = IERC20(pool_.lpTokenAddress).balanceOf(address(this));

        if (block.number > pool_.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = getMultiplier(pool_.lastRewardBlock, block.number);
            uint256 dvgForPool = multiplier.mul(POOL_PERCENT).mul(pool_.poolWeight).div(totalPoolWeight).div(10000);
            accDVGPerLP = accDVGPerLP.add(dvgForPool.mul(1 ether).div(lpSupply));
        }

        return user_.lpAmount.mul(accDVGPerLP).div(1 ether).sub(user_.finishedDVG);
    }

    /** 
     * @notice Add a new LP to pool. Can only be called by owner
     * DO NOT add the same LP token more than once. DVG rewards will be messed up if you do
     */
    function addPool(address _lpTokenAddress, uint256 _poolWeight, bool _withUpdate) public onlyOwner {
        require(block.number < END_BLOCK, "Already ended");
        require(_lpTokenAddress.isContract(), "LP token address should be smart contract address");

        if (_withUpdate) {
            massUpdatePools();
        }
        
        uint256 lastRewardBlock = block.number > START_BLOCK ? block.number : START_BLOCK;
        totalPoolWeight = totalPoolWeight + _poolWeight;

        pool.push(Pool({
            lpTokenAddress: _lpTokenAddress,
            poolWeight: _poolWeight,
            lastRewardBlock: lastRewardBlock,
            accDVGPerLP: 0
        }));

        emit AddPool(_lpTokenAddress, _poolWeight, lastRewardBlock);
    }

    /** 
     * @notice Update the given pool's weight. Can only be called by owner.
     */
    function setPoolWeight(uint256 _pid, uint256 _poolWeight, bool _withUpdate) public onlyOwner {
        if (_withUpdate) {
            massUpdatePools();
        }

        totalPoolWeight = totalPoolWeight.sub(pool[_pid].poolWeight).add(_poolWeight);
        pool[_pid].poolWeight = _poolWeight;

        emit SetPoolWeight(_pid, _poolWeight, totalPoolWeight);
    }

    /** 
     * @notice Update reward variables of the given pool to be up-to-date.
     */
    function updatePool(uint256 _pid) public {
        Pool storage pool_ = pool[_pid];

        if (block.number <= pool_.lastRewardBlock) {
            return;
        }

        uint256 totalDVG = getMultiplier(pool_.lastRewardBlock, block.number).mul(pool_.poolWeight).div(totalPoolWeight);

        uint256 lpSupply = IERC20(pool_.lpTokenAddress).balanceOf(address(this));
        if (lpSupply > 0) {
            uint256 dvgForPool = totalDVG.mul(POOL_PERCENT).div(10000);

            dvg.mint(treasuryWalletAddr, totalDVG.mul(TREASURY_WALLET_PERCENT).div(10000)); 
            dvg.mint(communityWalletAddr, totalDVG.mul(COMMUNITY_WALLET_PERCENT).div(10000));
            dvg.mint(address(this), dvgForPool);

            pool_.accDVGPerLP = pool_.accDVGPerLP.add(dvgForPool.mul(1 ether).div(lpSupply));
        } else {
            dvg.mint(treasuryWalletAddr, totalDVG.mul(TREASURY_WALLET_PERCENT).div(10000)); 
            dvg.mint(communityWalletAddr, totalDVG.mul(COMMUNITY_WALLET_PERCENT.add(POOL_PERCENT)).div(10000));
        }

        pool_.lastRewardBlock = block.number;

        emit UpdatePool(_pid, pool_.lastRewardBlock, totalDVG);
    }

    /** 
     * @notice Update reward variables for all pools. Be careful of gas spending!
     * Due to gas limit, please make sure here no significant amount of pools!
     */
    function massUpdatePools() public {
        uint256 length = pool.length;
        for (uint256 pid = 0; pid < length; pid++) {
            updatePool(pid);
        }
    }

    /** 
     * @notice Deposit LP tokens for DVG rewards
     * Before depositing, user needs approve this contract to be able to spend or transfer their LP tokens
     *
     * @param _pid       Id of the pool to be deposited to
     * @param _amount    Amount of LP tokens to be deposited
     */
    function deposit(uint256 _pid, uint256 _amount) public {
        Pool storage pool_ = pool[_pid];
        User storage user_ = user[_pid][msg.sender];

        updatePool(_pid);

        if (user_.lpAmount > 0) {
            uint256 pendingDVG_ = user_.lpAmount.mul(pool_.accDVGPerLP).div(1 ether).sub(user_.finishedDVG);
            if(pendingDVG_ > 0) {
                _safeDVGTransfer(msg.sender, pendingDVG_);
            }
        }

        if(_amount > 0) {
            IERC20(pool_.lpTokenAddress).safeTransferFrom(address(msg.sender), address(this), _amount);
            user_.lpAmount = user_.lpAmount.add(_amount);
        }

        user_.finishedDVG = user_.lpAmount.mul(pool_.accDVGPerLP).div(1 ether);

        emit Deposit(msg.sender, _pid, _amount);
    }

    /** 
     * @notice Withdraw LP tokens
     *
     * @param _pid       Id of the pool to be withdrawn from
     * @param _amount    amount of LP tokens to be withdrawn
     */
    function withdraw(uint256 _pid, uint256 _amount) public {
        Pool storage pool_ = pool[_pid];
        User storage user_ = user[_pid][msg.sender];

        require(user_.lpAmount >= _amount, "Not enough LP token balance");

        updatePool(_pid);

        uint256 pendingDVG_ = user_.lpAmount.mul(pool_.accDVGPerLP).div(1 ether).sub(user_.finishedDVG);

        if(pendingDVG_ > 0) {
            _safeDVGTransfer(msg.sender, pendingDVG_);
        }

        if(_amount > 0) {
            user_.lpAmount = user_.lpAmount.sub(_amount);
            IERC20(pool_.lpTokenAddress).safeTransfer(address(msg.sender), _amount);
        }

        user_.finishedDVG = user_.lpAmount.mul(pool_.accDVGPerLP).div(1 ether);

        emit Withdraw(msg.sender, _pid, _amount);
    }

    /** 
     * @notice Withdraw LP tokens without caring about DVG rewards. EMERGENCY ONLY
     *
     * @param _pid    Id of the pool to be emergency withdrawn from
     */
    function emergencyWithdraw(uint256 _pid) public {
        Pool storage pool_ = pool[_pid];
        User storage user_ = user[_pid][msg.sender];

        uint256 amount = user_.lpAmount;

        user_.lpAmount = 0;
        user_.finishedDVG = 0;

        IERC20(pool_.lpTokenAddress).safeTransfer(address(msg.sender), amount);

        emit EmergencyWithdraw(msg.sender, _pid, amount);
    }
     
    /** 
     * @notice Safe DVG transfer function, just in case if rounding error causes pool to not have enough DVGs
     *
     * @param _to        Address to get transferred DVGs
     * @param _amount    Amount of DVG to be transferred
     */
    function _safeDVGTransfer(address _to, uint256 _amount) internal {
        uint256 dvgBal = dvg.balanceOf(address(this));
        
        if (_amount > dvgBal) {
            dvg.transfer(_to, dvgBal);
        } else {
            dvg.transfer(_to, _amount);
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
    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'
        // solhint-disable-next-line max-line-length
        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).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _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
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../GSN/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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT


pragma solidity 0.7.6;


import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";


/// DVG token
contract DVGToken is ERC20("DVGToken", "DVG"), Ownable {
    using Address for address;
    using SafeMath for uint256;


    /// A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }


    /// We need mint some DVG in advance
    uint256 public dvgInAdvance;

    /// The address of Treasury wallet
    address public treasuryWalletAddr;

    /// The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    // A record of each accounts delegate
    mapping (address => address) internal _delegates;

    /// A record of votes checkpoints for each account, by index
    mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;

    /// The number of checkpoints for each account
    mapping (address => uint32) public numCheckpoints;

    /// A record of states for signing / validating signatures
    mapping (address => uint) public nonces;


    /// An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);


    /// @notice We need mint some DVGs in advance. 
    /// After that, the ownership of DVG token will be transferred to DAOventures liquidity mining smart contract,
    /// which means nobody will be able to control mining of DVG token. 
    constructor(address _treasuryWalletAddr, uint256 _dvgInAdvance) {
        require(!_treasuryWalletAddr.isContract(), "The Treasury wallet address should not be the smart contract address");

        treasuryWalletAddr = _treasuryWalletAddr;
        dvgInAdvance = _dvgInAdvance;

        mint(treasuryWalletAddr, dvgInAdvance);
    }


    /// @notice Creates `_amount` token to `_to`. Must only be called by the owner
    function mint(address _to, uint256 _amount) public onlyOwner {
        _mint(_to, _amount);
        _moveDelegates(address(0), _delegates[_to], _amount);
    }

    /**
     * @notice Get `delegatee` of `delegator`
     * @param delegator The address to get delegatee for
     */
    function delegates(address delegator)
        external
        view
        returns (address)
    {
        return _delegates[delegator];
    }

   /**
    * @notice Delegate votes from `msg.sender` to `delegatee`
    * @param delegatee The address to delegate votes to
    */
    function delegate(address delegatee) external {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    )
        external
    {
        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name())),
                getChainId(),
                address(this)
            )
        );

        bytes32 structHash = keccak256(
            abi.encode(
                DELEGATION_TYPEHASH,
                delegatee,
                nonce,
                expiry
            )
        );

        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator,
                structHash
            )
        );

        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "delegateBySig: invalid nonce");
        require(block.timestamp <= expiry, "delegateBySig: signature expired");
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account)
        external
        view
        returns (uint256)
    {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber)
        external
        view
        returns (uint256)
    {
        require(blockNumber < block.number, "getPriorVotes: not yet determined");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee)
        internal
    {
        address currentDelegate = _delegates[delegator];
        uint256 delegatorBalance = balanceOf(delegator); // balance of underlying DVGs (not scaled);
        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                // decrease old representative
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint256 srcRepNew;
                if (srcRepOld > amount) {
                    srcRepNew = srcRepOld.sub(amount);
                } else {
                    srcRepNew = 0;
                    amount = srcRepOld;
                }
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                // increase new representative
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint256 dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint256 oldVotes,
        uint256 newVotes
    )
        internal
    {
        uint32 blockNumber = safe32(block.number, "_writeCheckpoint: block number exceeds 32 bits");

        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function getChainId() internal pure returns (uint) {
        uint256 chainId;
        assembly { chainId := chainid() }
        return chainId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.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 guidelines: functions revert instead
 * of 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 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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 {_setupDecimals} is
     * called.
     *
     * 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 returns (uint8) {
        return _decimals;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(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:
     *
     * - `to` 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 = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(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);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @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 to 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 { }
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• Zokyo - May 21st, 2021 - Security Audit Report

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DVGToken","name":"_dvg","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"lpTokenAddress","type":"address"},{"indexed":true,"internalType":"uint256","name":"poolWeight","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"lastRewardBlock","type":"uint256"}],"name":"AddPool","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EmergencyWithdraw","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract DVGToken","name":"dvg","type":"address"}],"name":"SetDVG","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"poolWeight","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalPoolWeight","type":"uint256"}],"name":"SetPoolWeight","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"treasuryWalletAddr","type":"address"},{"indexed":true,"internalType":"address","name":"communityWalletAddr","type":"address"}],"name":"SetWalletAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"TransferDVGOwnership","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"lastRewardBlock","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalDVG","type":"uint256"}],"name":"UpdatePool","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"poolId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"BLOCK_PER_PERIOD","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"COMMUNITY_WALLET_PERCENT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"END_BLOCK","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERIOD_AMOUNT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"POOL_PERCENT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"START_BLOCK","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TREASURY_WALLET_PERCENT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_lpTokenAddress","type":"address"},{"internalType":"uint256","name":"_poolWeight","type":"uint256"},{"internalType":"bool","name":"_withUpdate","type":"bool"}],"name":"addPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"communityWalletAddr","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dvg","outputs":[{"internalType":"contract DVGToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"}],"name":"emergencyWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_from","type":"uint256"},{"internalType":"uint256","name":"_to","type":"uint256"}],"name":"getMultiplier","outputs":[{"internalType":"uint256","name":"multiplier","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"massUpdatePools","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"address","name":"_user","type":"address"}],"name":"pendingDVG","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"periodDVGPerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"pool","outputs":[{"internalType":"address","name":"lpTokenAddress","type":"address"},{"internalType":"uint256","name":"poolWeight","type":"uint256"},{"internalType":"uint256","name":"lastRewardBlock","type":"uint256"},{"internalType":"uint256","name":"accDVGPerLP","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract DVGToken","name":"_dvg","type":"address"}],"name":"setDVG","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_poolWeight","type":"uint256"},{"internalType":"bool","name":"_withUpdate","type":"bool"}],"name":"setPoolWeight","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_treasuryWalletAddr","type":"address"},{"internalType":"address","name":"_communityWalletAddr","type":"address"}],"name":"setWalletAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalPoolWeight","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferDVGOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"treasuryWalletAddr","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"}],"name":"updatePool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"user","outputs":[{"internalType":"uint256","name":"lpAmount","type":"uint256"},{"internalType":"uint256","name":"finishedDVG","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000059e83877bd248cbfe392dbb5a8a29959bcb48592000000000000000000000000dd6c35aff646b2fb7d8a8955ccbe0994409348d000000000000000000000000051e00a95748dbd2a3f47bc5c3b3e7b3f0fea666c

-----Decoded View---------------
Arg [0] : _treasuryWalletAddr (address): 0x59E83877bD248cBFe392dbB5A8a29959bcb48592
Arg [1] : _communityWalletAddr (address): 0xdd6c35aFF646B2fB7d8A8955Ccbe0994409348d0
Arg [2] : _dvg (address): 0x51e00a95748DBd2a3F47bC5c3b3E7B3F0fea666c

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000059e83877bd248cbfe392dbb5a8a29959bcb48592
Arg [1] : 000000000000000000000000dd6c35aff646b2fb7d8a8955ccbe0994409348d0
Arg [2] : 00000000000000000000000051e00a95748dbd2a3f47bc5c3b3e7b3f0fea666c