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/* Copyright (C) 2020 PlotX.io
  This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
  This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
  You should have received a copy of the GNU General Public License
    along with this program.  If not, see http://www.gnu.org/licenses/ */

pragma solidity 0.5.7;

import "./PlotXToken.sol";
import "./SafeMath.sol";
import "./ERC20.sol";


contract Staking {
    
    using SafeMath for uint256;

    /**
     * @dev Structure to store Interest details.
     * It contains total amount of tokens staked and globalYield.
     */
    struct InterestData {
        uint256 globalTotalStaked;
        uint256 globalYieldPerToken; 
        uint256 lastUpdated;
        mapping(address => Staker) stakers;  
    }

    /**
     * @dev Structure to store staking details.
     * It contains amount of tokens staked and withdrawn interest.
     */
    struct Staker {
        uint256 totalStaked;
        uint256 withdrawnToDate;
        uint256 stakeBuyinRate;  
    }


    // Token address
    ERC20 private stakeToken;

    // Reward token
    PlotXToken private rewardToken;

    // Interest and staker data
    InterestData public interestData;

    uint public stakingStartTime;

    uint public totalReward;

    // unclaimed reward will be trasfered to this account
    address public vaultAddress; 

    // 10^18
    uint256 private constant DECIMAL1e18 = 10**18;

    //Total time (in sec) over which reward will be distributed
    uint256 public stakingPeriod;

    /**
     * @dev Emitted when `staker` stake `value` tokens.
     */
    event Staked(address indexed staker, uint256 value, uint256 _globalYieldPerToken);

    /**
     * @dev Emitted when `staker` withdraws their stake `value` tokens.
     */
    event StakeWithdrawn(address indexed staker, uint256 value, uint256 _globalYieldPerToken);


    /**
     * @dev Emitted when `staker` collects interest `_value`.
     */
    event InterestCollected(
        address indexed staker,
        uint256 _value,
        uint256 _globalYieldPerToken
    );

    /**     
     * @dev Constructor     
     * @param _stakeToken The address of stake Token       
     * @param _rewardToken The address of reward Token   
     * @param _stakingPeriod valid staking time after staking starts
     * @param _totalRewardToBeDistributed total amount to be distributed as reward
     */
    constructor(
        address _stakeToken,
        address _rewardToken,
        uint256 _stakingPeriod,
        uint256 _totalRewardToBeDistributed,
        uint256 _stakingStart,
        address _vaultAdd
    ) public {
        require(_stakingPeriod > 0, "Should be positive");
        require(_totalRewardToBeDistributed > 0, "Total reward can not be 0");
        require(_stakingStart >= now, "Can not be past time");
        require(_stakeToken != address(0), "Can not be null address");
        require(_rewardToken != address(0), "Can not be null address");
        require(_vaultAdd != address(0), "Can not be null address");
        stakeToken = ERC20(_stakeToken);
        rewardToken = PlotXToken(_rewardToken);
        stakingStartTime = _stakingStart;
        interestData.lastUpdated = _stakingStart;
        stakingPeriod = _stakingPeriod;
        totalReward = _totalRewardToBeDistributed;
        vaultAddress = _vaultAdd;
    }

    /**
     * @dev Allows a staker to deposit Tokens. Notice that `approve` is
     * needed to be executed before the execution of this method.
     * @param _amount The amount of tokens to stake
     */
    function stake(uint256 _amount) external {
        require(_amount > 0, "You need to stake a positive token amount");
        require(
            stakeToken.transferFrom(msg.sender, address(this), _amount),
            "TransferFrom failed, make sure you approved token transfer"
        );
        require(now.sub(stakingStartTime) <= stakingPeriod, "Can not stake after staking period passed");
        uint newlyInterestGenerated = now.sub(interestData.lastUpdated).mul(totalReward).div(stakingPeriod);
        interestData.lastUpdated = now;
        updateGlobalYieldPerToken(newlyInterestGenerated);
        updateStakeData(msg.sender, _amount);
        emit Staked(msg.sender, _amount, interestData.globalYieldPerToken);
    }

    /**
     * @dev Updates InterestData and Staker data while staking.
     * must call update globalYieldPerToken before this operation
     * @param _staker                 Staker's address
     * @param _stake                  Amount of stake
     *
     */
    function updateStakeData(
        address _staker,
        uint256 _stake
    ) internal {
        Staker storage _stakerData = interestData.stakers[_staker];

        _stakerData.totalStaked = _stakerData.totalStaked.add(_stake);

        updateStakeBuyinRate(
            _stakerData,
            interestData.globalYieldPerToken,
            _stake
        );

        interestData.globalTotalStaked = interestData.globalTotalStaked.add(_stake);
    }

    /**
     * @dev Calculates and updates the yield rate in which the staker has entered
     * a staker may stake multiple times, so we calculate his cumulative rate his earning will be calculated based on GlobalYield and StakeBuyinRate
     * Formula:
     * StakeBuyinRate = [StakeBuyinRate(P) + (GlobalYield(P) x Stake)]
     *
     * @param _stakerData                  Staker's Data
     * @param _globalYieldPerToken         Total yielding amount per token 
     * @param _stake                       Amount staked 
     *
     */
    function updateStakeBuyinRate(
        Staker storage _stakerData,
        uint256 _globalYieldPerToken,
        uint256 _stake
    ) internal {

        _stakerData.stakeBuyinRate = _stakerData.stakeBuyinRate.add(
            _globalYieldPerToken.mul(_stake).div(DECIMAL1e18)
        );
    }

    /**
     * @dev Withdraws the sender staked Token.
     */
    function withdrawStakeAndInterest(uint256 _amount) external {
        Staker storage staker = interestData.stakers[msg.sender];
        require(_amount > 0, "Should withdraw positive amount");
        require(staker.totalStaked >= _amount, "Not enough token staked");
        withdrawInterest();
        updateStakeAndInterestData(msg.sender, _amount);
        require(stakeToken.transfer(msg.sender, _amount), "withdraw transfer failed");
        emit StakeWithdrawn(msg.sender, _amount, interestData.globalYieldPerToken);
    }
    
    /**
     * @dev Updates InterestData and Staker data while withdrawing stake.
     *
     * @param _staker                 Staker address
     * @param _amount                 Amount of stake to withdraw
     *
     */    
    function updateStakeAndInterestData(
        address _staker,
        uint256 _amount
    ) internal {
        Staker storage _stakerData = interestData.stakers[_staker];

        _stakerData.totalStaked = _stakerData.totalStaked.sub(_amount);

        interestData.globalTotalStaked = interestData.globalTotalStaked.sub(_amount);

        _stakerData.stakeBuyinRate = 0;
        _stakerData.withdrawnToDate = 0;
        updateStakeBuyinRate(
            _stakerData,
            interestData.globalYieldPerToken,
            _stakerData.totalStaked
        );
    }

    /**
     * @dev Withdraws the sender Earned interest.
     */
    function withdrawInterest() public {
        uint timeSinceLastUpdate = _timeSinceLastUpdate();
        uint newlyInterestGenerated = timeSinceLastUpdate.mul(totalReward).div(stakingPeriod);
        
        updateGlobalYieldPerToken(newlyInterestGenerated);
        uint256 interest = calculateInterest(msg.sender);
        Staker storage stakerData = interestData.stakers[msg.sender];
        stakerData.withdrawnToDate = stakerData.withdrawnToDate.add(interest);
        require(rewardToken.transfer(msg.sender, interest), "Withdraw interest transfer failed");
        emit InterestCollected(msg.sender, interest, interestData.globalYieldPerToken);
    }

    function updateGlobalYield() public {
        uint timeSinceLastUpdate = _timeSinceLastUpdate();
        uint newlyInterestGenerated = timeSinceLastUpdate.mul(totalReward).div(stakingPeriod);
        updateGlobalYieldPerToken(newlyInterestGenerated);
    }

    function getYieldData(address _staker) public view returns(uint256, uint256)
    {

      return (interestData.globalYieldPerToken, interestData.stakers[_staker].stakeBuyinRate);
    }

    function _timeSinceLastUpdate() internal returns(uint256) {
        uint timeSinceLastUpdate;
        if(now.sub(stakingStartTime) > stakingPeriod)
        {
            timeSinceLastUpdate = stakingStartTime.add(stakingPeriod).sub(interestData.lastUpdated);
            interestData.lastUpdated = stakingStartTime.add(stakingPeriod);
        } else {
            timeSinceLastUpdate = now.sub(interestData.lastUpdated);
            interestData.lastUpdated = now;
        }
        return timeSinceLastUpdate;
    }

    /**
     * @dev Calculates Interest for staker for their stake.
     *
     * Formula:
     * EarnedInterest = MAX[TotalStaked x GlobalYield - (StakeBuyinRate + WithdrawnToDate), 0]
     *
     * @param _staker                     Staker's address
     *
     * @return The amount of tokens credit for the staker.
     */
    function calculateInterest(address _staker)
        public
        view
        returns (uint256)
    {
        Staker storage stakerData = interestData.stakers[_staker];

        
        uint256 _withdrawnToDate = stakerData.withdrawnToDate;

        uint256 intermediateInterest = stakerData
            .totalStaked
            .mul(interestData.globalYieldPerToken).div(DECIMAL1e18);

        uint256 intermediateVal = _withdrawnToDate.add(
            stakerData.stakeBuyinRate
        );

        // will lead to -ve value
        if (intermediateVal > intermediateInterest) {
            return 0;
        }

        uint _earnedInterest = (intermediateInterest.sub(intermediateVal));

        return _earnedInterest;
    }

    /**
     * @dev Calculates and updates new accrued amount per token since last update.
     *
     * Formula:
     * GlobalYield = GlobalYield(P) + newlyGeneratedInterest/GlobalTotalStake.
     *
     * @param _interestGenerated  Interest token earned since last update.
     *
     */
    function updateGlobalYieldPerToken(
        uint256 _interestGenerated
    ) internal {
        if (interestData.globalTotalStaked == 0) {
            require(rewardToken.transfer(vaultAddress, _interestGenerated), "Transfer failed while trasfering to vault");
            return;
        }
        interestData.globalYieldPerToken = interestData.globalYieldPerToken.add(
            _interestGenerated
                .mul(DECIMAL1e18) 
                .div(interestData.globalTotalStaked) 
        );
    }


    function getStakerData(address _staker) public view returns(uint256, uint256)
    {

      return (interestData.stakers[_staker].totalStaked, interestData.stakers[_staker].withdrawnToDate);
    }

    /**
     * @dev returns stats data.
     * @param _staker Address of staker.
     * @return Total staked.
     * @return Total reward to be distributed.
     * @return estimated reward for user at end of staking period if no one stakes from current time.
     * @return Unlocked reward based on elapsed time.
     * @return Accrued reward for user till now.
     */
    function getStatsData(address _staker) external view returns(uint, uint, uint, uint, uint)
    {

        Staker storage stakerData = interestData.stakers[_staker];
        uint estimatedReward = 0;
        uint unlockedReward = 0;
        uint accruedReward = 0;
        uint timeElapsed = now.sub(stakingStartTime);

        if(timeElapsed > stakingPeriod)
        {
            timeElapsed = stakingPeriod;
        }

        unlockedReward = timeElapsed.mul(totalReward).div(stakingPeriod);

        uint timeSinceLastUpdate;
        if(timeElapsed == stakingPeriod)
        {
            timeSinceLastUpdate = stakingStartTime.add(stakingPeriod).sub(interestData.lastUpdated);
        } else {
            timeSinceLastUpdate = now.sub(interestData.lastUpdated);
        }
        uint newlyInterestGenerated = timeSinceLastUpdate.mul(totalReward).div(stakingPeriod);
        uint updatedGlobalYield;
        uint stakingTimeLeft = 0;
        if(now < stakingStartTime.add(stakingPeriod)){
         stakingTimeLeft = stakingStartTime.add(stakingPeriod).sub(now);
        }
        uint interestGeneratedEnd = stakingTimeLeft.mul(totalReward).div(stakingPeriod);
        uint globalYieldEnd;
        if (interestData.globalTotalStaked != 0) {
            updatedGlobalYield = interestData.globalYieldPerToken.add(
            newlyInterestGenerated
                .mul(DECIMAL1e18)
                .div(interestData.globalTotalStaked));

            globalYieldEnd = updatedGlobalYield.add(interestGeneratedEnd.mul(DECIMAL1e18).div(interestData.globalTotalStaked));
        }
        
        accruedReward = stakerData
            .totalStaked
            .mul(updatedGlobalYield).div(DECIMAL1e18);

        if (stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate) > accruedReward)
        {
            accruedReward = 0;
        } else {

            accruedReward = accruedReward.sub(stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate));
        }

        estimatedReward = stakerData
            .totalStaked
            .mul(globalYieldEnd).div(DECIMAL1e18);
        if (stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate) > estimatedReward) {
            estimatedReward = 0;
        } else {

            estimatedReward = estimatedReward.sub(stakerData.withdrawnToDate.add(stakerData.stakeBuyinRate));
        }

        return (interestData.globalTotalStaked, totalReward, estimatedReward, unlockedReward, accruedReward);

    }
}

pragma solidity ^0.5.0;

import "./IERC20.sol";
import "./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 `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * 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 IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) internal _balances;

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

    uint256 private _totalSupply;

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

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

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

    /**
     * @dev See `IERC20.balanceOf`.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

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

    /**
     * @dev See `IERC20.approve`.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        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 `value`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(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 returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][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 returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * 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 `value`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function _transferFrom(address sender, address recipient, uint256 amount) internal {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

     /**
     * @dev Destoys `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 value) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is 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 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

    /**
     * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See `_burn` and `_approve`.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
    }
}

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
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 Mints `amount` tokens to address `account`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a `Transfer` event.
     */
    function mint(address account, 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.
     *
     * > 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);
}

/* Copyright (C) 2020 PlotX.io

  This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

  This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
    along with this program.  If not, see http://www.gnu.org/licenses/ */

pragma solidity 0.5.7;

import "./ERC20.sol";
import "./SafeMath.sol";

contract PlotXToken is ERC20 {
    using SafeMath for uint256;

    mapping(address => uint256) public lockedForGV;

    string public name = "PLOT";
    string public symbol = "PLOT";
    uint8 public decimals = 18;
    address public operator;

    modifier onlyOperator() {
        require(msg.sender == operator, "Not operator");
        _;
    }

    /**
     * @dev Initialize PLOT token
     * @param _initialSupply Initial token supply
     * @param _initialTokenHolder Initial token holder address
     */
    constructor(uint256 _initialSupply, address _initialTokenHolder) public {
        _mint(_initialTokenHolder, _initialSupply);
        operator = _initialTokenHolder;
    }

    /**
     * @dev change operator address
     * @param _newOperator address of new operator
     */
    function changeOperator(address _newOperator)
        public
        onlyOperator
        returns (bool)
    {
        require(_newOperator != address(0), "New operator cannot be 0 address");
        operator = _newOperator;
        return true;
    }

    /**
     * @dev burns an amount of the tokens of the message sender
     * account.
     * @param amount The amount that will be burnt.
     */
    function burn(uint256 amount) public {
        _burn(msg.sender, amount);
    }

    /**
     * @dev Burns a specific amount of tokens from the target address and decrements allowance
     * @param from address The address which you want to send tokens from
     * @param value uint256 The amount of token to be burned
     */
    function burnFrom(address from, uint256 value) public {
        _burnFrom(from, value);
    }

    /**
     * @dev function that mints an amount of the token and assigns it to
     * an account.
     * @param account The account that will receive the created tokens.
     * @param amount The amount that will be created.
     */
    function mint(address account, uint256 amount)
        public
        onlyOperator
        returns (bool)
    {
        _mint(account, amount);
        return true;
    }

    /**
     * @dev Transfer token for a specified address
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     */
    function transfer(address to, uint256 value) public returns (bool) {
        require(lockedForGV[msg.sender] < now, "Locked for governance"); // if not voted under governance
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Transfer tokens from one address to another
     * @param from address The address which you want to send tokens from
     * @param to address The address which you want to transfer to
     * @param value uint256 the amount of tokens to be transferred
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) public returns (bool) {
        require(lockedForGV[from] < now, "Locked for governance"); // if not voted under governance
        _transferFrom(from, to, value);
        return true;
    }

    /**
     * @dev Lock the user's tokens
     * @param _of user's address.
     */
    function lockForGovernanceVote(address _of, uint256 _period)
        public
        onlyOperator
    {
        if (_period.add(now) > lockedForGV[_of])
            lockedForGV[_of] = _period.add(now);
    }

    function isLockedForGV(address _of) public view returns (bool) {
        return (lockedForGV[_of] > now);
    }
}

pragma solidity ^0.5.0;

/**
 * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @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.
     *
     * _Available since v2.4.0._
     */
    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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

library SafeMath64 {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint64 a, uint64 b) internal pure returns (uint64) {
        uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint64 c = a - b;

        return c;
    }

    /**
     * @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.
     *
     * _Available since v2.4.0._
     */
    function sub(uint64 a, uint64 b, string memory errorMessage) internal pure returns (uint64) {
        require(b <= a, errorMessage);
        uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
        // 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;
        }

        uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000009db640e18390d2408c71e9927d8518c79d5569c600000000000000000000000072f020f8f3e8fd9382705723cd26380f8d0c66bb00000000000000000000000000000000000000000000000000000000004f1a00000000000000000000000000000000000000000000007f0e10af47c1c7000000000000000000000000000000000000000000000000000000000000005fad3fe00000000000000000000000007b781d8c483ba33fa2aa40ead13f3a943ab08814

-----Decoded View---------------
Arg [0] : _stakeToken (address): 0x9Db640e18390D2408C71E9927d8518c79d5569c6
Arg [1] : _rewardToken (address): 0x72F020f8f3E8fd9382705723Cd26380f8D0c66Bb
Arg [2] : _stakingPeriod (uint256): 5184000
Arg [3] : _totalRewardToBeDistributed (uint256): 600000000000000000000000
Arg [4] : _stakingStart (uint256): 1605189600
Arg [5] : _vaultAdd (address): 0x7b781D8c483Ba33FA2aA40eAD13F3A943ab08814

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000009db640e18390d2408c71e9927d8518c79d5569c6
Arg [1] : 00000000000000000000000072f020f8f3e8fd9382705723cd26380f8d0c66bb
Arg [2] : 00000000000000000000000000000000000000000000000000000000004f1a00
Arg [3] : 000000000000000000000000000000000000000000007f0e10af47c1c7000000
Arg [4] : 000000000000000000000000000000000000000000000000000000005fad3fe0
Arg [5] : 0000000000000000000000007b781d8c483ba33fa2aa40ead13f3a943ab08814

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bzzr://cd2c829af5130d3d8b5c8aa18a0da733a676bfba645b67b8462a93e9491a9d73